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Research status of Molybdenum extraction from Molybdenum lead Ore

The leaching process of sodium sulphide can not separate molybdenum and lead from colored molybdenum lead ore by traditional processing, such as gravity separation, magnetic separation, flotation and so on. For a long time, simply using colored molybdenum lead ore as lead ore to smelt lead, not only the recovery of lead is low, but also the molybdenum, which has higher value than lead, is lost in vain and can not be recycled, resulting in great waste. In order to recover the high value metal molybdenum from the colored molybdenum lead ore, the coarse concentrate of the colour molybdenum lead ore was selected by gravity separation method (the recovery rate was about 30% ~ 60%), and the concentrate was recovered by hydrometallurgical process. Concentrate conventional leaching agents such as nitric acid, hydrochloric acid, caustic soda, sodium sulfide, sulfuric acid and sodium carbonate, and so on. [4] from the point of view of separation of molybdenum and lead, it is better to use sodium sulphide as leaching agent. Depending on the chemical composition of ore, the amount of leaching agent sodium sulphide is generally more than the theoretical amount, the ratio of slurry to solid is (2 ~ 5): 1, the leaching time is 2 ~ 6 h, and the leaching temperature is kept at 90 ~ 95 ℃. Otherwise, the leaching rate of molybdenum is reduced. Lead molybdate was converted into sodium molybdate solution, and lead was precipitated as artificial lead concentrate (PbS). After filtration, the precipitate was washed and dried to lead smelter. Sodium molybdate solution was evaporated, crystallized and produced sodium molybdate. [4] the main principle of the method of separating colored molybdenum and lead ore by biological leaching and extraction is to decompose the colored molybdenum lead ore by the biochemical action of bacteria, so that lead and molybdenum can be separated into different phases respectively. The ore was broken and the particle size was less than 0.074 mm after ball milling. The separation of colored molybdenum lead ore was realized through the processes of bacterial culture, heap expansion, leaching, extraction, back extraction, ammonium, acid precipitation and so on. After leaching, molybdenum enters the aqueous phase and is enriched and purified by extraction and back extraction. Finally, ammonium molybdate is obtained, and lead enters the slag phase, which can be floated to recover lead or pile up in the tailings dam. [4] the bioleaching process reduces the dosage of reagent and the requirement of raw ore. The closed cycle is carried out at room temperature and atmospheric pressure, and the zero discharge of pollutants is basically realized. The main drawback of this process is that the leaching rate of molybdenum is not high (Mo,Pb is toxic to most bacteria), in addition, the heap leaching period is long, the area is large, and the production investment is large. [4] the leaching reaction of direct decomposition process by mechanochemical method belongs to the liquid-solid heterogeneous reaction, and the reaction solid material is small, which is beneficial to improve the leaching rate. The conventional leaching process of sodium sulfide requires fine ore size, so ball milling process is set up to ensure the particle size required for leaching reaction. [4] during mechanical vibration ultrafine grinding or mechanical agitation grinding (Attrito rgrinding), mechanochemical effects occur, and the energy consumed is stored in mineral lattices in addition to heat energy or surface energy. The lattice defects and stresses are increased, which can reduce the apparent activation energy of leaching reaction and increase the leaching rate. Based on this, the Institute of Chemical Metallurgy of Central South University proposed for the first time a new process of direct decomposition of colored molybdenum lead ore by mechanochemical method (has applied for invention patent). The new process directly adds leachate and related auxiliaries to the ball mill, directly decomposes the colored molybdenum ore in the ball mill by mechanochemical action, combines the ball milling process with the leaching process, and saves the heating and stirring process. It reduces energy consumption, saves equipment investment and increases production capacity. [5] compared with the leaching method of sodium sulfide, the new process of direct decomposition by mechanochemical method can be combined with solvent extraction technology to purify and enrich ammonium molybdate to produce ammonium molybdate, which is a clean production. The wastewater can be recycled (alkaline wastewater returned to the ball mill process), which has the advantages of high leaching rate of molybdenum, saving energy consumption, saving equipment and so on. It is a better method to treat color-molybdenum lead ore.