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Utilization of waste Water from Tungsten Ore dressing

  • Mosten
  • 28 Mar

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.The discharge amount of the waste water is 5-10 times of that of the original ore, and the suspended matter of the waste water is mainly silt and tailing powder, because the particle size is very fine, the near-colloid which is finely divided is not easy to settle naturally, and the other tailing powder contains heavy metal elements, and the heavy metal elements are easily soluble in acid, alkali and other biochemical actions, the heavy metal element is polluted; a large amount of flotation agent is added to the ore dressing operation; the chemical agents remain in the waste liquid discharged by the concentrator, and the decomposition substances such as the metal ions, the solid suspension, the organic and the inorganic medicaments, and the like are also left in the ore dressing waste liquid, The direct discharge will cause serious pollution to the land and water in the basin and cause pressure on the ecological environment. Therefore, the effective treatment of the ore-dressing wastewater is a major problem to be solved for a long time in various mines, and it is also a technical problem that must be taken into account in the process of ore dressing. It is an important technical measure to solve this problem, and it is also an important premise to realize the comprehensive utilization of the ore-dressing waste water. In the process of tungsten ore dressing, a large amount of water glass and a collecting agent are added, the fine particle content of the ore dressing wastewater is large, the settling is slow, and the direct recycling of the ore dressing wastewater will seriously affect the ore dressing index. In particular, that direct return of the tailing water to the ore grinding and sulphide ore flotation will have a great effect on the flotation of the sulphide ore and the recovery of the subsequent tungsten. in that production, the return water is used for diversion and reuse, that is, the return water is returned to a corresponding operation, that is, the mine tailing water returns to the ore grinding and sulfide ore flotation, the oxidized ore flotation tailing water is returned to the oxidation ore flotation system, or the total tailing water is only returned to the oxidation ore flotation system, The utilization of 100% of the return water of the concentrator is realized in the small Liugou selection plant in Gansu. In recent years, a lot of research has been carried out in the light of the flocculant and the sedimentation technology of the selected tungsten wastewater. The ore-dressing water of a certain white-tungsten ore contains a large amount of solid suspension, the water sample is turbid, the COD and the Cr value are high, a large amount of organic matter and a reducing inorganic substance are contained, and a small amount of heavy metal ions such as Al, As, Cu, Fe, Mn and the like are contained. Sun Wei et al.[106] adopted the magnetic flocculation technology to greatly shorten the time required for flocculation and sedimentation, and the turbidity of the obtained clear liquid is lower, so that the complete recycling of the ore dressing waste water can be realized, and the purified water return water has little influence on the ore dressing index. Guo Chaohui et al.[107] study the sedimentation effect of different flocculant and coagulant aid on the ore dressing wastewater, and adopt the magnetization and flocculation technology to study the wastewater from the ore dressing waste water of a certain white-tungsten mine in Jiangxi. The result shows that the waste water of the scheelite can be fully recycled after purification. The concentration of suspended matter and chemical oxygen demand (COD) in the ore-dressing waste water of a certain tungsten-bearing polymetallic ore are high, the heavy metal concentration is low but the species are many, and it is difficult to stably reach the standard. Guo Chaohui et al.[108] adopt two-step coagulation and precipitation of aluminum-containing inorganic high-molecular coagulant and organic coagulant aid to treat the ore-dressing waste water of the tungsten-tungsten-gold mine, and the results of 24-hour on-site dynamic sampling show that the coagulation-precipitation method can effectively treat the ore-dressing waste water of the tungsten multi-metal ore. In addition, a suitable polysilicate aluminum sulfate ferric flocculant is prepared by optimizing the aluminum-silicon-silicon ratio in the polysilicate aluminum sulfate iron to carry out water treatment. In addition, the turbidity of the wastewater is more than 95%, the turbidity of the wastewater after treatment is 70 NTU, and the removal rate of COD is up to 70%. The COD content in the treated wastewater was 72 mg/ L, the removal rate of As, Be and Pb was more than 90%, and the mass concentration of As, Be and Pb in the treated wastewater was 34, 0.2 and 13.mu. g/ L, respectively, and the treated wastewater reached the primary standard of GB8978-1996 (Integrated Wastewater Discharge Standard>). The content of suspended solids in the ore-dressing wastewater of a certain tungsten ore in Jiangxi is high, and the main pollution factors are SS, COD, Cr, pH, lead and zinc. Chen Ming et al.[109] The treatment of the tailing pond of the tungsten ore was carried out by the method of sedimentation of the lime-destable flocculant, and the pH value was adjusted to 11.5 with lime milk and allowed to stand for 10 min. After the treatment, the pH of the supernatant of the waste water was 8.5, SS was reduced to 128 mg/ L, and the content of COD and Cr was lower than 50 mg/ L, Pb, Cd, As the mass concentration of As decreased to 0.03, 0.005 and 0.064 mg/ L in turn. The content of suspended solids in the tailings water of a certain tungsten-containing ore-dressing enterprise in the Yinchuan is high, and the composition is more complex. It contains a variety of mineral processing agents, such as No.2 oil, water glass, kerosene, soda, saponified sodium and the like, as well as a large amount of water glass. Li Zhancheng et al.[110] According to the research, the calcium carbide slag and the organic high-molecular flocculant are mixed and used, the water settling speed of the tailings is high, the return water is clear, the quality is good, the treatment cost of the tailing water is low, and only one medicine can be saved at a cost of about 300,000 yuan/ year. Due to the fact that when the calcium-containing industrial waste residue is added into the tailing water, the electric double layer with the negative charge colloid is compressed because the positively charged Ca2 is provided, the potential of the electric double layer is reduced, the stability of the negatively charged colloid is destroyed, and the particles in the tailing water are condensed. but after the calcium-containing industrial waste residue is added, the particle size of the floc particles is small, the settling speed is slow, the settling time is long, the organic high-molecular flocculant is bridged by the polymer, the destable particles are bonded together to form larger particles, so that the sedimentation property of the floc is improved, And the removal effect is enhanced.

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tungsten