The two departments issue the control index of the total amount of tungsten and tungsten mine in the year 2019
Inner Mongolia, Heilongjiang, Zhejiang, Anhui, Fujian, Jiangxi, Shandong, Henan, Hubei, Hunan, Guangdong, Guangxi, Sichuan, Yunnan, Shaanxi, Gansu, Xinjiang and other provinces (regions) natural resource competent department, industrial and information competent department: In order to protect and reasonably develop the dominant mineral resources, according to the relevant regulations on the management of the specific mineral resources of the protective mining, the total amount control of the mining and the tungsten mine is continued in 2019.
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Tungsten concentrate
Tungsten concentrate is produced in North China, northwest and southwest, especially from Guangxi in the west, through Hunan, Guangdong, Jiangxi and east to the Nanling Mountains of Fujian Province. Among them, southern Jiangxi is the most concentrated, hundreds of large and small mines, Daji Mountain, Xihua Mountain, Kumei Mountain, Pangu Mountain and so on are all world-famous tungsten mines.
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The purpose of the molybdenum
Molybdenum has high melting point, good strength at high temperature, low pollution, good machining performance, good thermal conductivity and good mechanical properties at high temperature. Therefore, it is used in all kinds of high temperature components just like tungsten. It includes molybdenum crucible, molybdenum core rod, molybdenum ring and molybdenum tube.
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What is iron molybdate? What are the characteristics of it?
Ferroalloys composed of Molybdenum and Fe, generally containing 50% Molybdenum and 60% Molybdenum, are used as alloy additives for steelmaking.
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Breaking the monopoly of foreign technology and realizing the mass production of G6 generation super large size Molybdenum target for semiconductors in China
It is reported that China has developed the first G6 generation of super-large high-end Molybdenum target with completely independent intellectual property rights, and achieved mass production this quarter. This means that in the Asia-Pacific region, China is the first country to be able to produce super-large Molybdenum targets for semiconductors, and it also marks the breaking of Europeundefineds monopoly on the core technology.
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Analysis on the causes of Tungsten defects in Weld Weld
1. Under the condition of tungsten electrode type and tungsten electrode diameter, the bearing capacity of tungsten electrode to current is limited. Excessive welding current will lead to tungsten electrode burning loss, and finally lead to tungsten inclusion defect.
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Measures to control weld seam with tungsten defect
1. The welding current used is selected strictly according to the type and diameter of the tungsten electrode. Cerium tungsten electrode is a good choice in low current welding environment to ensure good arc ignition performance. Lanthanum tungsten electrode is suitable for large welding current (I > 100A) and AC power supply welding. Lanthanum tungsten electrode is not easy to burst under the condition of large temperature difference.
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Do you know how big is the impact on the weld?
Tungsten inclusion defect is a unique welding defect in TIG welding (tungsten argon arc welding). The harm of tungsten inclusion is to deteriorate the mechanical properties of the joint and reduce the service life of the welded structure. In argon arc welding of tungsten, due to some reasons, the tungsten electrode is strongly heated, and the debris that melts, evaporates or collapses in the weld becomes a high density inclusion, which is called tungsten inclusion.
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The Buddha is fishing?
When it comes to bait, people will say, "isnundefinedt that food that seduces fish to take the bait?" What does it have to do with tungsten alloys? Yes, food is the real bait to lure the fish into the bait. If it is eaten by the fish, it will be gone. But the bait, which is called false bait, is not food, but a bait made of tungsten alloy.
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Tungsten alloy paperweight: a flat "the world"
The paper should not only be elegant, but also have a sense of quality and weight in your hands. It has a wide variety of materials, such as: valuable sandalwood and mahogany; beautiful jade, crystal, agate, ivory; precious chicken blood, Bahrain, but mainly jade, porcelain, iron, copper, wood.
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Molybdenum
Molybdenum is a kind of transition element, which is very easy to change its oxidation state, and plays a role in the transfer of electrons in the redox reaction in the body. In the form of oxidation, molybdenum is likely to be in the 6-valence state. Although molybdenum is likely to be first reduced to a 5-valence state during electronic transfer.
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What are the uses of molybdenum?
1. Steel additives
As an alloy additive for steel, it is the most important use of iron and steel, and the steel containing the steel accounts for 1/10 of the world molybdenum crude steel production. Alloy steel: It has the largest consumption of steel, accounting for 44% of the total consumption of the world, accounting for more than half of the amount of steel added.
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What are the uses of molybdenum?
1. Steel additives
As an alloy additive for steel, it is the most important use of iron and steel, and the steel containing the steel accounts for 1/10 of the world molybdenum crude steel production. Alloy steel: It has the largest consumption of steel, accounting for 44% of the total consumption of the world, accounting for more than half of the amount of steel added.
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Argon tungsten-arc welding
The tungsten electrode argon arc welding is often referred to as a TIG welding, and is an arc welding method for generating heat between the non-expendable electrode and the working object, This protection is supplied by a gas or mixed gas stream, which must be full protection because even a very small amount of air is mixed into the weld bead.
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Peasants plant vegetable beans. Before flowering, they can be used reasonably
In order to increase the yield of the kidney bean, it is an effective measure to increase the yield of the kidney bean and increase the yield of the bean. So, when will the beans be made up with boron and manure?
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Cut inventory effect, tungsten prices will rebound to
Brake effective, supply tightening
At the end of may this year, China tungsten industry association launched an initiative: control production capacity, reduce production, rational sales, and jointly maintain supply order. According to the official website of China tungsten industry association, the annual production of tungsten concentrate of the participating enterprises accounts for 86% of the total output of China tungsten association.
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Rare earth Molybdenum
Molybdenum _ 2O _ 3 was reduced to Molybdenum _ 2O _ 2 in hydrogen at 550 ℃, and 0.2% (mass fraction) rare earth oxide solution was added to each part of Molybdenum _ 2O _ 2. Molybdenum _ 2O _ 2 and pure Molybdenum _ 2 mixed with rare earth were reduced to Molybdenum powder in hydrogen at about 1100 ℃. Then it was pressed by 300 MPa and sintered in hydrogen at 1 800 ℃ for 10 h.
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Physical vaporous deosition
Thermal decomposition of hexacarbonyl Molybdenum is one of the important means to prepare molybdenum coating by physical vapor deposition. The main reaction of carbonyl molybdenum decomposition is that:
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Tungsten Fiber Reinforced Composite Material
The fiber-reinforced composite has been remarkable in the material industry because of the extremely high strength of the fibers or whiskers of any material. The tungsten whiskers having a diameter of 3 to 8. m u.m have an ultimate tensile strength of up to 28 120 MPa, however, because of the difficulties in the production of whiskers, the conventional tungsten fiber reinforced composite material is a tensile tungsten wire with a diameter of 0.076 to 0.178 mm as the reinforcing agent.
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Semiconductor Rectifier
Tungsten wafer cut from tungsten rod or tungsten sheet (or pressed and sintered) can be hard (soft) welded with semiconductor silicon wafer and used in high performance semiconductor rectifier in sandwich shape.
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Production of titanium zirconium molybdenum Alloy head
According to its production method, Titanium Zirconium Molybdenum alloy head can be divided into three kinds: casting head, powder metallurgy head and processing shape head. The technological process is as follows.
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Spinning forming Technology of Molybdenum Crucible
Molybdenum is a kind of rare metal, which is an important strategic material that canundefinedt be regenerated. Molybdenum is an important base material for the modernization of the country and the construction of modern national defense. As a non-renewable resource, with the increasing application of the material, the demand is increasing, and the price is higher and higher, so the advanced forming method is adopted to deep-process the waste material so as to achieve the purpose of saving material and improving the efficiency.
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Interview with the Secretary of the Dayu County CPC Committee of the "Tungstate Capital of the World": I hope to launch the strategic collection and storage of tungsten and the price protection mechanism
Dayu county, a small county on the southwest edge of jiangxi province, has the most complete tungsten industry chain in the world.From the most front-end tungsten mining, to the highest end of hard alloy, shield alloy processing, tool drilling tools, tungsten industry has achieved a "full chain, global sales."
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What is tungsten and copper?
Tungsten-copper alloy has a wide range of applications, mainly used in the manufacture of high voltage electrical switch contacts and rocket nozzle throat lining, tail rudder and other high temperature components, as well as electrical processing electrodes, high temperature molds and other occasions requiring conductive and thermal conductivity and high temperature use.
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Suggestions for China's tungsten industry
China has long been a major supplier of tungsten to the international market, but has not yet been able to guide the market sufficiently. The tungsten market has followed the old path of rising price, rising output, oversupply and low price. In order to develop and utilize tungsten resources more reasonably and gain better economic benefits, the following two Suggestions are put forward from the perspective of trade.
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China's tungsten products industry status
As an important non-renewable scarce resource, tungsten has been listed as an important strategic metal in the world.
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To plant a crop of crops
I shared with you a little skill of adding urea to the leaf fertilizer some time ago. I wonder if you have tried it. Such a combination can increase the effect of leaf fertilizer, but also promote the nutritional absorption of crops.
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Downstream stainless steel orders continue to release, which is expected to stimulate a rise in molybdenum prices
On July 26, the China Special Steel Association released China stainless steel crude steel statistics for 2019. The apparent consumption of stainless steel in the first half of 2019 was 11.929 million tons, an increase of 1.575 million tons, or 15.21 percent, compared with the same period last year.
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Non-Standard Thermocouple
The production process of the other thermocouple is not mature enough, the application scope and quantity are not as good as the standardized thermocouple, there is no unified scale, and there is no supporting display instrument. Most of these thermocouples meet some special measurement requirements, such as ultra-high temperature, very low temperature, high vacuum or nuclear radiation environment. This kind of thermocouple is called non-standard thermocouple.
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High-end tungsten products
Tungsten belongs to high melting point rare metal or refractory rare metal in the field of metallurgy and metal materials. Tungsten and its alloy is one of the most important functional materials in modern industry, national defense and high and new technology application.
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China tungsten association: strict control of rational sales of total amount of tungsten mining
The market price of tungsten raw materials rebounded slightly in the first quarter. The average price of tungsten concentrate in China in March was 97400 yuan per ton, down 13.35 percent from the same period last year, 2.10 percent higher than in February and 3.07 percent higher than in January.
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Scientists have found that the oxygen gap in monolayer tungsten dienide enables it to be used as a single-photonic emitter for quantum optical applications
Scientists have found that the oxygen gap in monolayer tungsten dienide (WSe2) enables it to be used as a single-photonic emitter (SPEs) for quantum optical applications. In recent years, two-dimensional (2 ≤ D) materials with atomic thin cellular lattices have been found in experiments.
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Properties and application characteristics of Mo and Mo alloys
Molybdenum is a kind of refractory metal, the melting point is 2630 ℃, the recrystallizing temperature is about 900 ℃, the strength is high at high temperature, and the processing performance is good. It is not only a heat-resistant coating material, but also the only metal material of heat-resistant hydrochloric acid.
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Prospect of tungsten alloy
The advantage of tungsten alloy development lies in the low cost of environmental protection, but the disadvantage is that it can not replace chromium plating and cadmium plating in some working environments. The bottleneck of this process development is to improve product performance, there are three problems to be solved.
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Production process status and Fault treatment of Tungsten Alloy Electroplating
2.1 Development History At the beginning of the technical popularization, the enterprise is trying to find the breakthrough in the direction of the application of the product, and test and test the mechanical products of all walks of life, including the textile machinery, the food machinery, the pipe drawing equipment, the automobile parts, the hydraulic equipment, the petroleum machinery and the like, In that meantime, the transformation of the particular productundefineds production process and the blind trial of the market have led to the marketundefineds suspicion of the electroplating of the tungsten alloy.
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Development of tungsten alloy electroplating process
Tungsten alloy electroplating is a new type of electroplating which takes into account the dual properties of wear resistance and anticorrosion. It is environmentally friendly and has no harm to operators and high production efficiency.
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Recovery of non-metallic mineral in tungsten tailings
Molybdenum fertilizer is a kind of fertilizer that plays a key role in crop growth. How on earth should Molybdenum fertilizer be applied? The following is an introduction to the application of Molybdenum fertilizer: the application method of Molybdenum fertilizer.
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Recovery of non-metallic mineral in tungsten tailings
The non-metallic minerals in tungsten metal mainly include quartz, feldspar, mica, garnet, fluorite and calcite, among which the non-metallic minerals with comprehensive recovery value are fluorite and garnet. 1 Fluorite fluorite recovered from tungsten tailings is an important non-metallic ore widely used in chemical industry, metallurgy and building materials industry. the grade of fluorite ore in China is generally low, in which the reserves of associated deposits account for 43%.
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Recovery of valuable metals from tungsten tailings
There are many useful metals in the tungsten-tail deposit, such as tin, iron, iron, copper, lead, zinc, antimony, iron, cobalt, gold, silver, etc. Some of them are harmful impurities in the tungsten smelting process, and the useful metals can be recovered through the combination of the smelting and metallurgy, so that the quality of the tungsten products can be improved, and the comprehensive utilization rate of the tungsten ore resources can be effectively improved.
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Tungsten tailings
Tungsten tailings is produced in the process of mineral processing. Because the grade of tungsten ore is generally low, it is 0.1% ≤ 0.7%, resulting in a large number of tailings, accounting for more than 90% of the original ore.
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Molybdenum-tungsten alloy
Mo-based alloys containing 25% and 30% tungsten have excellent properties to prevent corrosion of molten zinc. They can be used to fabricate molten zinc pumps and electrolytic zinc electrodes and filter molten zinc. The temperature characteristic properties (1) the melting point of Mo-W alloy increases with the increase of tungsten content.
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Zirconiated tungsten electrode
The tungsten-tungsten electrode is an electrode variety developed in order to improve the defect that the pure tungsten electrode can easily melt and pollute the workpiece under high-load welding conditions, the electrode is characterized in that the end part of the electrode can be kept in a spherical shape to reduce the tungsten-permeability phenomenon under the condition of high load current, And has good corrosion resistance.
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Secret of high durability of alloy left drilling tungsten steel left bit
Alloy left drill, commonly known as tungsten steel left drill, left bit, widely used in automatic lathe industry. The material used in cemented carbide left bit is cemented carbide, which has high hardness. At present, it is only low and diamond superhard material in the world. Its physical hardness is above HRA90.
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The reduction of production is not less than 10%. In the back of the rare-earth explosion, the highly-linked resource small variety of colored tungsten also burst into a strong and good shape
In the first quarter of this year, the price of the tungsten market rebounded slightly, and the price of the international tungsten market remained stable, but after April, it was adversely affected by the lack of confidence in the tungsten market, the market expectation and the disturbance of excess capacity, which led to the adverse reaction of the market, and the supply and demand of the tungsten market were weak.
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State policy on tungsten and Molybdenum issued: abolishing the ban on foreign investment in Molybdenum prospecting and mining, and encouraging foreign investment in tungsten and Molybdenum deep processing industries
On June 30, 2019, the State Development and Reform Commission and the Ministry of Commerce issued the Special Management measures for Foreign Investment access (negative list) (2019 Edition), the Special Management measures for Foreign Investment access in Free Trade pilot area (negative list) (2019 Edition), and the catalogue of encouraging Foreign Investment Industries (2019 Edition).
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The technology of tungsten-arc welding of TC6 titanium alloy
TC6 titanium alloy belongs to α + β two-phase alloy, which can be strengthened by quenching and aging, and can be adapted to various welding methods.
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Scientists have developed high - performance molybdenum alloys
With the support of the national natural science foundation and other projects, sun jun research group of xi 'an jiaotong university national key laboratory of metal material strength successfully developed the nano-structured dispersion reinforced molybdenum alloy material. The material has nano-enhanced rare earth oxide particles and ultrafine microstructure, and the tensile ductility is increased exponentially. The results were recently published online in the journal nature materials science.
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Does boron fertilizer and Molybdenum fertilizer have the effect of preventing premature senescence of peanut at the later stage of peanut growth?
Boron and Molybdenum micro fertilizer can only prevent all kinds of symptoms and premature senescence caused by lack or serious lack of boron and Molybdenum micro fertilizer in peanut at the later growth stage. It has little effect on the lack of other element fertilizers and has no effect on physiological problems caused by diseases and insect pests.
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The source of tungsten
The minerals such as wolframite, scheelite, and tungsten iron ore contain tungsten. The important tungsten ore is in Bolivia, the United States of California and Colorado, China, Portugal, Russia and South Korea. China produces 75% of the worldundefineds tungsten.
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The development history of tungsten
Tungsten is a non-ferrous metal and is also an important strategic metal. The tungsten ore is known as the "heavy stone" in ancient times. In 1781, the white-tungsten ore was discovered by the Swedish chemist, Carl William Schiller, and a new element acid-tungstic acid was extracted. In the same year, tungsten powder was first obtained with carbon-reduced tungsten trioxide, and the element was named. The content of tungsten in the earthundefineds crust is 0.001%.
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Tungsten has a very high melting point, the highest of all alloy metals, do you really know?
Tungsten is a chemical element, the chemical symbol is W, the atomic number is 74, is a very hard, steel gray to white transition metal. The minerals containing tungsten are wolframite and scheelite. The physical characteristics of tungsten are very strong, especially the melting point is very high, which is the highest of all non-alloy metals.
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Materials with the highest melting point: Carbides, nitrides, metal tungsten?
When it comes to the world, we can always think of a few. For example, the Yellow River, the mother of the Chinese nation, is the river with the largest sand content in the world; Meng Jiangnuundefineds "Great Wall", "crying", is the longest wall in the world; and, for example, diamond, which symbolizes love and can be used as a cutting tool, is the hardest material in nature. However, what I want to introduce today is the most difficult to melt in the world. This also has to be subdivided, is it the most refractory pure metal in the world? Or the most refractory material in the world? The answer for the former is pure tungsten, while the latter is a powder mixture recently synthesized by Russian scholars, carbides and nitride containing hafnium.
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The researchers found that Molybdenum selenide was not as strong as they thought!
The Rice team, led by material scientist Jun Lou, tested the tensile strength of two-dimensional semiconductor molybdenum selenide and found that a defect with a small missing atom can cause catastrophic cracks under strain. "not all two-dimensional crystals have proved equal," said Rice, a professor of material science and nanoengineering. Graphene is more powerful than some of the other graphene we are dealing with now, just like this molybdenum selenide. We think it has something to do with the inherent defects of these materials.
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The research breakthrough of ultra-thin solar cells, nano-tungsten and Molybdenum can improve the electrical conductivity of graphene
The graphene is a single-layer carbon atom, and has an ideal characteristic suitable for various applications. In the last ten years, graphene is the most popular material. Only in 2017, more than 30,000 research papers on graphene have been published worldwide. Such as the most desirable graphene solar cell. Unfortunately, the small part of the "graphene battery" news in the country, not seeing real-volume products.
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Production of tungsten concentrate will be reduced by more than 10%
What is tungsten alloy? Tungsten is a strong, corrosion-resistant, high density, high hardness, high temperature resistant metal, and tungsten is often processed with other metal materials to improve its strength, melting point, hardness and so on. Most tungsten products are tungsten, stainless steel, nickel, copper, iron, etc.
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Tungsten ring
What is tungsten alloy? Tungsten is a strong, corrosion-resistant, high density, high hardness, high temperature resistant metal, and tungsten is often processed with other metal materials to improve its strength, melting point, hardness and so on. Most tungsten products are tungsten, stainless steel, nickel, copper, iron, etc.
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Tungsten ring
Tungsten ring is the first choice for modern people who pursue high quality jewelry. It can be kept for a long time.
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Tungsten ring
Tungsten ring is the first choice for modern people who pursue high quality jewelry. It can be kept for a long time.
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Tungsten steel jewelry
Tungsten is extremely hard and dense. Tungsten carbide was formed by combining with carbon and other elements, and the hardness was 8 ≤ 9 Morse. Tungsten steel jewelry is made of metal alloy and tungsten carbide. The alloy not only does not damage the tensile strength, but also achieves the maximum hardness and steel. Tungsten jewelry is about 10 times more important than 18K gold and four times harder than titanium.
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Suggestions on the existing existence of Molybdenum Mine
The main results are as follows: (1) improving the recovery rate of Molybdenum separation and the quality of Molybdenum concentrate products in an all-round way is a very valuable strategic resource, saving resources and comprehensive utilization is particularly important, as far as the recovery rate of Molybdenum ore dressing is concerned, At present, the recovery rate of Molybdenum in China is 1% lower than that in foreign countries.
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Turning waste into treasure ferroalloy slag can still be reused in this way
Since ferroalloy slag contains metals of high value, such as chromium, manganese, Molybdenum, Ni, titanium and so on, priority should be given to recovering valuable metals from ferroalloy slag, which can not be recovered at present, which can be used as construction material and agricultural fertilizer.
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Academician Zuo Tieyong, the first generation of famous experts in material science trained after the founding of the peopleundefineds Republic of China
He is the first generation of famous experts in material science trained after the founding of the peopleundefineds Republic of China, academician of the Chinese Academy of Engineering, Professor of Central South University, Beijing University of Technology, director, he is Academician Zuo Tieyong. Over the years, he has made important contributions to refractory metal materials, rare earth functional materials and their processing, and is one of the main leaders in refractory metals, aluminum and magnesium materials and processing in China.
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The product price of the product series is increased, and the elasticity of the company concentrate is the largest
On January 10 th, the price of Molybdenum series products accelerated on the whole line. Among them, the price of waste Molybdenum wire rose 15 yuan / kg to 142 yuan 147 yuan / kg, and the price of waste pure Molybdenum rose 17 yuan / kg to 149 yuan / kg, up more than 11%. The price of Molybdenum concentrate (45 per cent) rose 50 yuan per ton to 1545 yuan per ton, an increase of 3.3 percent, up 53.7 percent from the low in June last year.
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The production reduction is not less than 10%. Behind the rare earth explosion, the small variety of non-ferrous tungsten, which has a strong linkage, is also strong and beneficial to each other
Recently, the China Tungsten Industry Association held a forum in Ganzhou for some heads of tungsten enterprises. A total of 20 people attended the meeting of the China Tungsten Industry Association, which accounted for nearly 90 percent of the countryundefineds production capacity. The meeting agreed that the participating tungsten enterprises (groups) jointly maintain the supply order of the tungsten raw material market, and the output of tungsten concentrate will be reduced by no less than 10 percent this year.
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The Yudu-Ganxian area in southern Jiangxi is an important tungsten polymetallic metallogenic area
The Yudu-Ganxian area in southern Jiangxi is an important tungsten polymetallic metallogenic area in Yudu-Ganxian County, which is located in the complex part of the east-west tectonic-metallogenic belt in Nanling and the north-east tectonic-metallogenic belt in Wuyishan. The structure of the area is developed, magmatic activity is strong, and metallogenic geological conditions are superior.
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Progress has been made in the study of the genetic relationship between lead-zinc deposits and molybdenum deposits in the southern margin of North China where Guangzhou geochemistry is located
The southern margin of North China craton is famous for its abundant Mo resources and is the largest Mo ore belt in the world. With the deepening of geological prospecting, a large number of lead-zinc deposits have been discovered in the southern margin of North China in the past few decades, which makes this area an important source of lead and zinc resources in North China (figure 1).
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Why is it hard to deal with the repeated treatment of the tungsten mineundefineds chaos and mining?
In order to prevent the domestic tungsten combat to dig, protect and rationally develop and shortage of tungsten resources, the ministry of land and resources, the former state economic and trade commission, national development and reform commission and other departments have repeatedly issued documents since 1999, to rectification of tungsten production order in the country, but the mining order and has not been fundamentally improved, tungsten concentrate production continued to exceed bid.Reporter investigation found that investors for profit drive, local governments secretly indulge the regulation of going through the mill, smelting and processing enterprises in the middle and lower reaches of the scale of production to expand excess capacity and other reasons, resulting in tungsten production often rectification repeatedly rebound.
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The total amount control of rare earth ore tungsten mine will continue to be carried out
This year, China will continue to control the total amount of rare earth mines and tungsten mines
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Tungsten ore
The deposit is related to the second and three-stage magmatism in the early and third stages of the Yanshanian. It is known that the mineralization is mainly in the second-stage intrusive fine-grained granitic and third-stage intrusive fine-grained granites. The two-stage intrusive rock is produced by irregular rock or rock, and partly in the form of a dike-like output, and the multiple stages of the magmatism result in the complex structure of the rock mass and the superposition of the mineralization. The third stage of the intrusion of fine-grained granite, in addition to the tungsten ore, is associated with mineralization and mineralization. The ore minerals mainly include wolframite, scheelite, genectite, goethite, black and rare gold deposits, and other rare earth minerals. The ore has a fine grain structure and a compact and massive structure. The useful minerals are disseminated in the form of disseminated or fine-vein.
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The beginning of ore-finding breakthrough of Zhuxi tungsten-copper deposit in Jiangxi province (3)
Brilliance: fund linkage adds horsepower.
For a time, Zhuxi boiling, geology, drilling, physicochemical remote sensing and other colors covered the mountains. In order to reduce the risk and break through quickly, Jiangxi Provincial Geological Prospecting Fund Center put forward the idea of seeking the Central Geological Prospecting Fund to the Provincial Finance Department and the former Provincial Department of Land and Resources.
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The beginning of ore-finding breakthrough of Zhuxi tungsten-copper deposit in Jiangxi province (2)
Surprise: at the beginning of the lead project, team 9 / 12 collected 321 materials such as geophysics and remoteness for decades from the data office of the former Jiangxi Provincial Bureau of Land and Resources. Faced with the vast amount of information, geological experts such as Liu Jianguang, Chen Guohua, he Xirong and other geological experts carried out secondary research and development day and night, combined with a large number of field surveys, finally summed up the geological rules: there are a number of anomalies such as tungsten, copper and so on in the area.
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The beginning of ore-finding breakthrough of Zhuxi tungsten-copper deposit in Jiangxi province (1)
In September 2018, the 2018 Land and Resources Science and Technology Award of the Ministry of Natural Resources was announced by the Jiangxi Provincial Geological Prospecting Fund Management Center and the Ninth 12th Brigade of the Jiangxi Provincial Bureau of Geology and Mineral Resources. The scientific and technological innovation and major breakthrough in prospecting of Zhuxi World, Fuliang County, Jiangxi Province, which was jointly completed by the Central Geological Prospecting Fund Management Center, ranks first in the first prize.
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Welding method of stainless steel and molybdenum
Because the physical properties of molybdenum and its alloy are very different from stainless steel, there will be many problems in the welding process. In their welding, when heated to 400 ℃, a slight oxidation occurs, and when above 600 ℃, they rapidly oxidize to MoO3 compounds. The solubility of oxygen in molybdenum is very small. When the oxygen content increases, the oxide precipitates along the grain boundary, and the brittleness of other impurities is also precipitated, which makes the welding difficult. When molybdenum and stainless steel are welded, the high hardness and brittleness zone is easy to appear near the side of molybdenum base metal, the width of which is generally 0.5 ~ 3 mm.
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What is the trend of the back market of Mo?
In the first quarter of this year, the overall price of Mo market at home and abroad rose steadily and fluctuated slightly. From January to March, the average price of domestic Mo concentrate (45% ≤ 50%) was 1673 yuan / ton, up 3.40% from the same period last year. The average price of Mo-Fe in China was 11.45 yuan / ton, up 2.51% from the same period last year, and the average price of Mo oxide in the international market was 11.795 US dollars / pound, down 3.63% from the same period last year.
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Processing of molybdenum alloy
Plastic processing is not only the forming method of molybdenum alloy, but also can improve the strength and low temperature plasticity of molybdenum alloy. Molybdenum and its alloys can be produced by conventional plastic processing methods such as sheet, strip, foil, tube, bar, wire and profile. The characteristic of molybdenum alloy material processing is that each process of hot deformation has obvious influence on the final performance of the product.
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Molybdenum alloy series
The molybdenum alloys produced in industry can be divided into Mo-Ti-Zr series, Mo-W series and Mo-Re series alloys, as well as Mo-Hf-C series alloys strengthened by hafnium carbide particle precipitation. TZC (Mo-1.25 Ti-0.15 Zr-0.15C) alloy is the most widely used molybdenum alloy. TZC (TZC) alloy has higher high temperature strength and recrystallization temperature than TZM, but its processing is difficult and its application is limited.
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History of molybdenum alloys
The powder metallurgy process began to produce molybdenum products in 1910. Until 1945, the powder metallurgy process was a sheet of molybdenum.
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Molybdenum Alloys
Molybdenum alloy, which began to produce molybdenum products by powder metallurgy process in 1910. Until 1945, powder metallurgy process was the only industrial production method for molybdenum sheet, wire and bar. A nonferrous alloy formed by adding other elements to a molybdenum matrix. The main alloying elements are titanium, zirconium, hafnium, tungsten and rare earth elements. Molybdenum alloy is a non-ferrous alloy formed by adding other elements to molybdenum matrix.
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Application of molybdenum disulfide
Molybdenum disulfide is an important solid lubricant, especially suitable for high temperature and high pressure. It also has diamagnetism, can be used as a linear photoconductor and display P-type or N-type conductive properties of semiconductors, with rectifying and energy conversion. Molybdenum disulfide can also be used as a catalyst for dehydrogenation of complex hydrocarbons. It is also known as the "Advanced solid Lubricating Oil King."
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Application of ammonium molybdate
Used as a catalyst in the petroleum industry and used in the metallurgical industry to produce molybdenum, as raw material for ceramic glazes, pigments and other molybdenum compounds. 2, this product is an additive flame retardant, with dual functions of flame retardant and smoke suppression.
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Molecular dynamics simulation of the corrosion of tungsten alloy in liquid zinc
The liquid zinc has a strong corrosive effect on the metal immersed in the liquid, and it is of great practical significance to study the corrosion process of the metal in the liquid zinc.
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Cobalt-chromium-tungsten alloy (CoCrW)
Cobalt-chromium-tungsten alloy (CoCrW) is one of the (Stellite) alloys. Stalli alloy is a kind of cemented carbide which can resist various types of wear and corrosion and oxidation at high temperature. Commonly referred to as cobalt-based alloys. Stalli alloy was Co-Cr binary alloy at first, and later developed into Co-Cr-W ternary composition. Cobalt-chromium-tungsten alloys contain a considerable amount of chromium, tungsten and a small amount of nickel, molybdenum, silicon, carbon, niobium, tantalum and other alloy elements, and occasionally also contain iron.
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What are the disadvantages of tungsten argon arc welding
Despite the numerous advantages of tungsten argon arc welding, almost all metals can be welded! However, there are two aspects of all things, and he also has shortcomings. Specifically, because of the poor wind resistance, the welding pool with argon gas is used to protect the weld pool during the welding process. If there is a velocity of air exceeding 5mil/h during the welding process, Argon shielded gas will be blown away, which immediately infects the weld area, resulting in porosity of the weld.
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What is this, cool techs? Tungsten oxide insulation material can make the sunshine room warm in winter and cool in summer?
Smart home makes our home life more comfortable, more safe, more convenient! It also energy-saving and environmental protection, but also let our life quite artistic. Therefore, the intelligent sunshine room appears with it, does not let a person be surprised. So-called intelligence, one of them is to break the sunshine room like a "stove" in summer, winter like "refrigerator" said.
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The two ministries announce the targets for controlling the total amount of tungsten mining in Inner Mongolia this year
Recently, the Ministry of Natural Resources, Ministry of Industry and Information Technology issued the 2011 rare Earth Mine, Tungsten Mining Total Control Index (first batch) notice. The reporter learned that the first batch of rare earth mines in Inner Mongolia Autonomous region in 2019 the first batch of rare earth mining control index of 34625 tons, all of which are rock and mineral type (light) rare earth ore; The first batch of tungsten concentrate mining total volume control index of 1000 tons, of which the main mining index of 600 tons, comprehensive utilization index of 400 tons.
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The two ministries announce the total amount control index of tungsten mining of rare earth mine in Inner Mongolia in 2019
Recently, the Ministry of Natural Resources, Ministry of Industry and Information Technology issued the 2011 rare Earth Mine, Tungsten Mining Total Control Index (first batch) notice. The reporter learned that the first batch of rare earth mines in Inner Mongolia Autonomous region in 2019 the first batch of rare earth mining control index of 34625 tons, all of which are rock and mineral type (light) rare earth ore; The first batch of tungsten concentrate mining total volume control index of 1000 tons, of which the main mining index of 600 tons, comprehensive utilization index of 400 tons.
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When the inspector carried out | Cili Ni-Mo ore slag pollution mussel has so far formed a yellow "waterfall"?
If the slag is not properly treated, it will bring serious negative effects to the local soil safety and water quality safety. On August 1, the seventh environmental supervision team of Hunan Province went to Dongxi Township Nickel-Molybdenum Mine, Cili County, to conduct on-the-spot inspection of slag treatment. Nickel molybdenum slag pollution yellow "waterfall" inspection group along the winding mountain road along the way, the mountains on both sides of the lush, in sharp contrast to the road side of a yellow "waterfall" into the eye.
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This year, China will continue to control the total mining volume of rare earth ore tungsten ore and so on
Beijing, 20 Mar (Xinhua) in order to protect and rationally develop superior mineral resources, China will continue to implement the control of total mining volume of rare earth mines and other minerals, in accordance with the relevant regulations on the management of protective mining of specific minerals. This year our country will continue to rare earth ore, tungsten ore mining total control.
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Investigation and Comprehensive Utilization of tailings in six kinds of important Mines
Abstract: The comprehensive investigation of the important copper, lead, zinc, sulfur, gold and fluorite mine tailings has been carried out, and the characteristics of comprehensive utilization of copper, lead, zinc, sulfur, gold and fluorite mine tailings are formed. On the basis of the investigation, a typical tailings reservoir is selected, and the research of valuable components (metal, non-metal and whole utilization) in the tailings is carried out, and the key technology of recovery, resource and quantitative treatment of the recovery of the mining solid waste such as the garnet, the white tungsten and the tailings in the tailings is formed.
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Statistical Analysis on production and sales of Molybdenum concentrate in China and its Market Prospect
Molybdenum is a transition element which is easy to change its oxidation state and plays a role of electron transfer in the redox reaction in vivo. In the form of oxidation, molybdenum is likely to be in a 6-valent state. Although it is also likely to first revert to a 5-valent state during electron transfer. But other oxidation states of molybdenum have also been found in the reduced enzymes.
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What are the advantages of automobile halogen headlamps
The difference between automobile halogen headlamp and xenon headlamp: 1, xenon headlamp is no filament, it has only one soybean-sized gas luminous point in its lamp tube; halogen lamp has filament. 2. Xenon bulbs have three times the light intensity of ordinary halogen bulbs and consume only 2/3 of their energy. Xenon bulbs use almost the same color as sunlight, creating better visual conditions for drivers.
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Molybdenite
There are polytypes in molybdite. The results show that the occurrence of molybdite is related to the formation temperature. The 2H type molybdite has higher forming temperature than that of 3R type. The temperature changes from low to high to form amorphous MoS2 / 3MoS2 colloid MoS2 / 3MoS2 / 2HMoS2. The data of temperature measurement show that molybdite has a wide range of temperature, it can be formed from high temperature to relatively low temperature, and a large number of molybdite formed in the high to middle temperature stage.
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What metal is more resistant to tungsten than tungsten? Do you have a material with a melting point of 10,000 degrees?
Of all the metallic elements of the periodic table, tungsten has the highest melting point, with a melting point of 3422 ℃ (boiling point is 5930 ℃), and no metal element has a higher melting point than tungsten. The reason the melting point of tungsten is very high is related to the metal bond whose bond energy is very high. Tungsten is element 74, located in the sixth cycle of the VIB family in the periodic table. Among the congeners of tungsten, they have the largest number of valence electrons in metal elements, up to six, which means that each atom can form six metal bonds, so the bond energy of this group of elements is extremely high, resulting in a very high melting point.
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Utilization of waste Water from Tungsten Ore dressing
The tungsten waste water is mainly divided into the ore washing waste water, the crushing system waste water, the ore dressing waste water and the washing waste water, and has the following characteristics that the water discharge amount is large, accounting for 34-79% of the total mining wastewater quantity of the whole mine, the flotation water consumption is 1 t original ore waste water is 3.5-4.5 times of the original ore, and the flotation-magnetic selection method 1t original ore.
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How does the performance and use change after the stainless steel material is added to the element?
The molybdenum content of 316 molybdenum-containing stainless steel 316 is generally 2% / 3%. It has good corrosion resistance, processing hardness and high temperature strength. It can be used in caustic and cool conditions. It is the most widely used molybdenum-containing stainless steel. In the field of chemical industry, with good corrosion resistance, manufacturing chemical, dyestuff, papermaking, oxalic acid, fertilizer and other production equipment.
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How does F1 improve its performance? If it is tungsten alloy weight can solve the thorny problem?
Last monthundefineds F1 car of the year came to an end. In 2018, Hamilton won the 11th championship for his outstanding skill and performance on the field, the fifth time Hamilton won the championship. There are two more times to catch up with King Schumacher. When it comes to F1, it is the World Formula one Championships. It is organized by the International Federation of Automobile Sports. It is by far the highest level of racing in the world. Of course, it is also the most difficult one.
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Review of Tungsten Market in 2018 and Prospect of 2019
In 2018, Chinaundefineds tungsten industry is in a steady state of operation. The output of the tungsten concentrate is stable, the output of the smelting and processing products is increased, especially the production of the hard alloy continues to maintain double-digit growth; the amount of tungsten in the outlet keeps increasing, the increase of the increase and the increase of the import of the tungsten products; and the price of the tungsten market has fallen back, and the overall stability is overall.
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Guidance Price sharply lowered August Tungsten Price or continued downward
August 7, the domestic tungsten city in August the first round of long unit price, Ganzhou tungsten association forecast average price and large tungsten enterprise long unit price both showed a sharp decline. Industry insiders said the August guidance price cut sharply, coupled with the traditional off-season, demand is difficult to improve, the price of tungsten in the market is still the following behavior. Guide price cut sharply August 7, the domestic tungsten city in August the first round of long unit price out. In terms of the average price forecast of Ganzhou Tungsten Association, wolframite concentrate is 101000 yuan / ton, down 8000 yuan / ton from July, ammonium paratungstate (APT) 165000 yuan / ton, 10 million yuan / ton lower than July, and 265yuan / kg of medium-sized tungsten powder. It fell 13 yuan / kg from July. Zhang Yuan tungsten industry in the first half of August long single price and Xiamen tungsten industry in August the first APT long single cash price drop in varying degrees.
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Tungsten
Europe, the United States, Japan and South Korea are the four destinations of our countryundefineds export tungsten products. In 2018, the amount of tungsten (excluding hard metals) exported to Japan, South Korea and Europe increased by 19.25%, 8.91% and 4.20% on a year-on-year basis. The amount of tungsten exports to the United States fell by 11.29% on a year-on-year basis.
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Development of tungsten
The preparation method of the compact W is mainly divided into the melting method and the powder metallurgy method, which is limited by the melting point of W to 3 410 DEG C, and the method for preparing the W is mainly the powder metallurgy method. The smelting process is generally used for the preparation of WC and W slag purification. With the development of science and technology, in addition to the traditional liquid-phase sintering process, the process of low-temperature sintering, instantaneous liquid-phase sintering and microwave sintering has been developed to obtain the fine-grained microstructure.
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Molybdenum improves corrosion resistance and high temperature strength
The corrosion resistance of stainless steel is improved (with reference to the common stainless steel grade and corrosion resistance). The stainless steel containing stainless steel has better corrosion resistance compared with stainless steel containing no sulfur, and is often used in a more corrosive environment, such as chemical equipment or marine use. Stainless steel has a number of grades, and the content of iron (and chromium, nickel, nitrogen, etc.) is different. The best stainless steel grade shall be selected according to the corrosivity of the specific application environment.
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Role of Organic Molybdenum in Lubricating Oil
With the progress and development of society, people pay more and more attention to environmental protection and energy use efficiency, and promote the progress of lubricating oil technology and the upgrading of lubricating oil products. Better fuel economy, less exhaust emissions, longer fuel cycle and more stringent operating conditions within the engine have prompted constant development and upgrading of additives to deal with it. In this context, an organic molybdenum additive, which combines anti-friction and energy saving and anti-oxygen and anti-corruption properties, has been developed, causing a wave in the industry.
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A new process for separating black and white tungsten
Because of the different floating characteristics of the wolframite and scheelite, the flotation agent used in the flotation is different from the pH value of the flotation medium. The flotation of the wolframite in the weakly acidic medium is good, and the scheelite flotation is better in the alkaline medium, and the two minerals are simultaneously floated by the mixed flotation process, so that the selection of the medicament and the pH value of the medium are both balanced, The flotation effect of scheelite and wolframite is not optimal. The ore dressing index of the wolframite ore is poor, the recovery rate is low, the recovery rate is only 15-20%, the recovery rate of the whole tungsten is restricted, and the recovery rate of the scheelite is generally about 65%.
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What are the resource characteristics of wolframite and scheelite symbiosis ore?
Black-and-white tungsten mixed tungsten deposits account for a considerable proportion of the total tungsten resources, among which no representative tungsten deposits include Shizhuyuan tungsten-molybdenum-bismuth fluorite polymetallic deposit in Hunan province, Luokeng molybdenum-bearing scheelite in Fujian province and Huangshaping tungsten deposit in Guiyang, Hunan province. The reserves of tungsten resources in Shizhuyuan mine are 715.6 KT, those in Xingluokeng are 143.8 KT, and those in Huangshaping are 103 KT. In some wolframite deposits, there is usually a small amount of scheelite (usually less than 20%) which does not affect the main process structure, but only increases the separation of wolframite in the refined section.
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Preparation of a New Type of High strength and High toughness Molybdenum Alloy and its key Anti-oxidation Technology
Combining the excellent properties of TZM alloy and molybdenum-lanthanum alloy and combining rare earth doping technology with strengthening and toughening technology creatively a series of preparation processes with independent intellectual property rights were formed. Through micro-alloy composition design and ultrastructural control, rare earth doping, homogenization of mixture, refinement of grain strengthening, strong plastic deformation, low temperature sintering, anti-oxidation coating, etc.
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The radioprotective isotopes of tungsten alloys are different radionuclides of the same element
The radionuclides of tungsten alloys have the same number of protons, but the number of neutrons is different. In nature, natural isotopes are called natural isotopes and synthetic isotopes are called artificial isotopes. Among them, radioactive isotopes are called radioisotopes. Isotopes in radiation protection of tungsten alloys refer to radioisotopes. Each element has radioisotopes. Some radioisotopes exist in nature, while others are artificially produced by bombarding stable nuclei with nuclear particles (such as protons, a particles, or neutrons). Radioisotopes are unstable and undergo radioactive decay.
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Molybdenum raw material prices continue to rise last year performance climbing institutions optimistic that molybdenum prices will continue to high
Recently, the price of molybdenum products continues to rise, molybdenum iron, molybdenum oxide, molybdenum concentrate and other products prices are steadily higher. Luoyang Molybdenum (603993) has risen 10.77 percent since the opening of the pig year (Feb. 11-18), while Gold Molybdenum shares have risen 7.79 percent over the same period. With the gradual recovery of the market after the savings, the domestic molybdenum concentrate market prices rose last week.
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The melting point of tungsten is very high and is the highest in all the alloy metals. Do you really know?
Tungsten is a chemical element, chemical symbol is W, atomic number is 74, is very hard, steel gray to white transition metal. The minerals containing tungsten are wolframite and scheelite. Tungsten has very strong physical characteristics, especially the high melting point, which is the highest of all non-alloy metals. Pure tungsten is mainly used in electrical and electronic equipment, and many of its compounds and alloys are used in many other applications (the most common are filament of light bulbs, tungsten in X-ray tubes and in superalloys). Tungsten is a rare metal with high melting point and belongs to the VIB family of the sixth cycle (second long period) in the periodic table. Steel tungsten is a nonferrous metal and an important strategic metal. Tungsten ore was called "heavy rock" in ancient times.
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China has the final say in this resource, and China undefineds top 10 molybdenum mining companies control the lifeblood of the global molybdenum industry
First, the three world-class molybdenum mine projects integrate the domestic and foreign markets, and the molybdenum concentrate industry is a highly concentrated industry. The top 11 enterprises in the world control 72% of the supply of the market. Five of them are from China: in the next five years, the major mines that are likely to be put into production in China are the Daxing undefine danling forked molybdenum mine in Heilongjiang and the Shapinggou molybdenum mine in Anhui Province.
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The harm of thorium tungsten electrode to human body, do you know?
Due to different levels of radioactive contamination in production and use, thorium and tungsten electrodes have to be withdrawn from the stage of history sooner or later. However, what is the replacement of this most used electrode product after its withdrawal from the market? The second most widely used electrode is the cerium tungsten electrode, which is not contaminated by radioactivity. It belongs to green environmental protection products. It can start arc easily with very small current, and the arc current is small. Cerium tungsten electrode is very popular in low current DC condition.
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Present form record of molybdenum element
In 1958, pastures on a New Zealand pasture withered and died, and herdsmen complained. But it was surprising to find a path across the pasture full of lush green grass. The scientists looked at the green grass belt and brought back the sample for the experiment, and finally found the answer. It turned out that miners on the east side of the ranch cut across the pasture, and the metal powder from their shoes fell to the ground, turning the grass green. The scientists dissolved the metal powder in fertilizer and let herdsmen sprinkle it on the pasture. Soon the dead yellow pasture became green. Scientists further found that this metal is the basic element in the configuration of biological nutrient solution, plant growth, human body are inseparable from it.
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Tungsten is inseparable from transistors
Since the advent of transistors, tungsten has been an insoluble bond. The so-called transistor is a kind of variable current switch, which is different from the ordinary mechanical switch. It uses telecommunication signal to control its switch, and the switching speed can be very fast. In the laboratory, it can even reach the switch speed above 100GHz. It is small and is usually part of a computer, cell phone, or other electronic device. With the advent of transistors, large power-consuming tubes can be replaced by low-power electronic devices. Transistor is regarded as the greatest invention of electronic technology in the 20th century.
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Tungsten
Tungsten is a silver-white metal, shaped like steel. Tungsten has high melting point, low vapor pressure and low evaporation rate. The chemical properties of tungsten are very stable. It does not react with air or water at room temperature. Without heating, any concentration of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid or Wang Shui does not act on tungsten. When the temperature rises to 80 °-100 °C, among these acids, In addition to hydrofluoric acid, other acids have a weak effect on tungsten……
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Bite off the bones of scientific research! From a lot of tungsten resources to tungsten making energy is behind their decades of perseverance
China controls 50% of the worldundefineds tungsten, but it is a major source of metals, not a major producer. Years ago, we could only export low-end tungsten concentrate for foreign exchange, and even tungsten powder could not be treated. At that time, a ton of tungsten concentrate exports only 70,000 yuan, but a tonne of pure tungsten powder imports as high as 800000 yuan, high-end technology is entirely controlled by foreign enterprises. It was this group of engineers that repeatedly tested……
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Molybdenum ore identification
In metallurgical industry, molybdenum is used as additive for the production of various alloy steels, or with tungsten, nickel, cobalt, zirconium, titanium, vanadium, rhenium and other advanced alloys to improve its high temperature strength, wear resistance and corrosion resistance. Molybdenum-containing alloy steel is……
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Evaluation criteria for molybdenum ores
Up to now, no molybdenum elements have been found in nature. Among the more than 30 molybdenum minerals found, molybdenum is the most abundant and abundant, and molybdenum is the most abundant. Molybdenum ores account for more than 98% of the total molybdenum mining in the world. Although molybdenum ore and molybdate ore are widely distributed in the world, the amount of molybdenum ore is not large, and it is often exploited as a trace associated……
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Tungsten sputtering target
In todayundefineds IT industry rapid development today, chips can be said to be a variety of data analysis brain, is the core! At present, for high purity sputtering targets, the most advanced application field is the manufacture of vlsi chips, in fact semiconductor chips and other fields, it also has a large market share. In addition, with the increasing demand for automotive and other terminal semiconductor chips, the market capacity of semiconductor chips will be further enhanced in the future. Consumers believe that the Chinese automobile chip, will never lack the heart, in the near future……
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Advanced or backward?Tungsten carbide coating technology is used to enhance aircraft engines and other components in Europe and the United States
Tungsten carbide has high hardness, wear resistance, high temperature resistance and corrosion resistance. It is widely used in aerospace, petroleum, metallurgy, machinery and other fields. In general industrial applications, we call it hard alloy coating, usually take tungsten carbide/cobalt as the raw material, in the surface of nickel or fe-based material for supersonic spraying and form a protective layer, can increase the wear resistance and service life of the matrix. In principle, the implementation cost of this kind of process is not cheap, but compared with the damage of the whole parts and the overall replacement cost, the amount saved is considerable……
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Domestic tungsten iron market stable operation of the late market is difficult to improve
Domestic tungsten iron market operates stably today.It is understood that at this stage, as the domestic and foreign back-end consumer demand continues to be weak situation, the majority of manufacturers on the late market confidence has decreased, the recent entry of the operating willingness is generally low.
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Beware of heavy metal pollution! Tungsten deposits in water can have a "negative" effect on human bones
In 2013, the world's tungsten mines produced 97,136 tons (tungsten metal, the same below), an increase of 7% over 2012.China, Canada, Russia, Rwanda, Bolivia, Austria and Portugal are the main producers of tungsten in the world.
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Beware of heavy metal pollution! Tungsten deposits in water can have a "negative" effect on human bones
A team of scientists from the university of Chicago have published a new study in the journal Nature. They believe that tungsten may pose health risks to people, especially tungsten dust and tungsten-containing drinking water, which need to be taken seriously.
Previously, tungsten was thought to pose little or no health risk to the general population. Tungsten itself is not toxic, but studies have found that when dissolved in water is ingested by the body and stored in the bones, it produces a chemical similar to phosphor tungstate, which is difficult to remove and can increase the toxicity of other metals ingested.In particular, in some areas where tungsten is mined, it is not uncommon to find sources of water with high levels of tungsten. Long-term consumption of such surface water or groundwater may pose health risks.
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The mysterious strategic metal - molybdenum
In nature, molybdenum mainly exists in the form of molybdenite (MoS2).Natural molybdenite is a soft black mineral, and while molybdenite has been used since ancient times, it is indistinguishable from lead, galena and graphite.The word "molybdos" means lead in Greek.Until the late 18th century, both were sold as molybadenite in European markets.
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Tungsten alloy electroplating technology development prospects good grasp plate rotation
Tungsten alloys are made of highly conductive copper and refractory tungsten.The metal tungsten and copper neither dissolve each other nor form intermetallic compounds, but only form false alloys. Therefore, w-cu alloy presents the comprehensive excellent properties of tungsten, such as high temperature resistance, high hardness, low expansion coefficient, high thermal conductivity, electrical conductivity, good plasticity and so on.Due to their high resistance to arc ablation, welding, impact and mechanical strength, they are widely used in environments with high corrosion and wear.
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China produced 82,180 tons of tungsten concentrate in the first three quarters of 2018. The excess supply of tungsten concentrate will be improved
Tungsten is widely used in metal processing, machinery, electronics, mining, heavy manufacturing, petrochemical and other fields. As a strategic metal in China, tungsten is listed as a specific mineral for protective mining in China.
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Ore industry requirements
Molybdenum ore is relatively simple, mainly sulfide ore, its industrial requirements with the different mining methods and slightly changed. Molybdenum minerals are often associated with tungsten, bismuth, copper, lead, zinc, cobalt, iron, gold, niobium, beryllium, rhenium, indium, selenium, tellurium, uranium, sulfur and so on.
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Molybdenum compounds are also widely used in agricultural fertilizers
Characteristics of molybdenum raw materials
The element abundance of molybdenum in the earth's crust is about 1 10-6, and the highest molybdenum content is 2 10-6 in the magmatic rocks.Molybdenum is a transitional ferrophilic element in geochemical classification.Molybdenum is mainly combined with sulfur to form molybdenite.Other common molybdenum-containing minerals include ferromolybdenum bloom ([Fe3+(MoO4)8·8H2O)), calcium molybdate (CaMoO4), color molybdenum lead ore (PbMoO4), collosulfide molybdenum ore (MoS2), blue molybdenum ore (Mo3O8·nH2O), etc.
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The distribution and geological exploration of molybdenum in China
In the metallurgical industry, molybdenum is used as an additive in the production of various alloy steels, or as a senior alloy with tungsten, nickel, cobalt, zirconium, titanium, vanadium, rhenium, etc., to improve its high temperature strength, wear resistance and corrosion resistance.Molybdenum-containing alloy steel is used to make transportation devices, locomotives, industrial machinery, and various instruments.Certain stainless steels containing 4 ~ 5% molybdenum are used for the production of precision chemical instruments and equipment used in seawater environments.High speed cutting tools can be made from 4% ~ 9.5% high speed steel.Alloys of molybdenum, nickel and chromium are used in the manufacture of metal components for aircraft, and corrosion resistant parts for locomotives and automobiles.Alloys of molybdenum and tungsten, chromium and vanadium are used in the manufacture of alloy components and parts for warships, tanks, guns, rockets and satellites.
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Tungsten products and health protection
Tungsten is a very stable metal element, which is often found in various minerals in nature, but its properties are very stable. Tungsten compounds are harmful to human health. With the continuous expansion of the production scale of tungsten and its products, the use scope of tungsten is becoming wider and wider, and the potential threat of environmental pollution by tungsten is also on the rise. As a substance that can affect the chemical changes in the body and disrupt the biochemical exchange channels, the influence of tungsten on human health should also be paid attention to.
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