How to Decompose Tungsten Molybdenum and Bismuth Concentrate

China has a unique mineral resource containing antimony, tungsten and molybdenum. The antimony concentrate produced by the beneficiation usually contains a certain amount of tungsten and molybdenum. This kind of antimony sulfide concentrate containing tungsten and molybdenum can usually be directly treated with wet method.

The decomposition methods of tungsten and molybdenum bismuth concentrate are as follows: the bismuth sulfide concentrate containing tungsten and molybdenum is oxidized by pressure in sodium hydroxide solution, tungsten and molybdenum enter the alkaline leaching solution, and the bismuth and other heavy metals enter the alkaline leaching residue in the form of oxide. The effective separation of tungsten, molybdenum and bismuth in molybdenum sulfide concentrate is realized. The alkaline leach solution uses D363 resin and D314 resin to adsorb tungsten and molybdenum respectively. Finally, tungsten and molybdenum are desorbed respectively with ammonia water. The effective recovery of tungsten and molybdenum in the leaching solution is achieved. The main process is as follows:

The finely ground to a particle size of less than 0.149mm tungsten-containing molybdenum sulphide concentrate, the main components (%): Bi 32.86, Pb 1.1, Cu 2.07, S₂3.18, WO₃0.68, Mo1.40 and Fe14.03; Industrial-grade sodium hydroxide, in which the content of sodium hydroxide ≥ 96%; industrial-grade hydrochloric acid, including HCl content of 36% to 38%; industrial-grade oxygen, including O₂ content ≥ 99%.

The industrial sodium hydroxide 91.0g of the above composition is prepared by adding 700ml of water to a solution and adding 140g of the above-mentioned component of antimony sulfide concentrate. After being slurried, it is added to a pressure reactor having a volume of 1000ml to seal the reactor and adjust the stirring speed. It is 800r.min-1, and then gradually warms up to 150 ℃. After the temperature and pressure are stabilized, industrial oxygen is introduced and the partial pressure of oxygen is maintained at 0.5 MPa for 3 hours.

The pH of the alkaline leaching solution, 695ml, is adjusted to 6.9 by using the sulfuric acid solution of 0.5mol/L. At room temperature, the ion exchange with 12ml D363 resin is carried out. The exchange contact time is 60min. After the ion exchange is completed, the tungsten is adsorbed on the resin, that is, the 698 ml is obtained after the absorption of tungsten, and its component (g/L) is Na₂SO₄ 192, WO₃ 0.01, Mo 2.32, the adsorption rate of tungsten is 99.2%. At room temperature, the loaded tungsten D363 resin is desorbed at room temperature with 10% ammonia water 25ml. The desorption time is 60min. After the desorption is completed, the resin is returned to the regeneration treatment, and the ammonium tungstate solution is obtained. The concentration is 45.1 g/L, and the desorption rate of tungsten is 99.6%.

The pH value of tungsten absorption solution is 3.2 after adjusting with 0.5mol/L sulfuric acid solution. At room temperature, ion exchange with 15ml D314 resin is carried out. The exchange contact time is 90min. After the ion exchange is completed, the molybdenum is adsorbed on the resin, that is, the adsorbed liquid 702ml is obtained. The composition (g/L) is Na₂SO₄ 188, Mo 0.01, and the adsorption rate of molybdenum is 99.5%.

This method can effectively separate tungsten and bismuth from tungsten, molybdenum and bismuth sulfide concentrate, the leaching rate of tungsten and molybdenum is over 99%, and bismuth and copper are oxidized into alkaline leaching residue. The alkaline pressure leaching solution uses the resin to adsorb tungsten and molybdenum, the recovery rate of tungsten and molybdenum is above 99%; the material requirements of the equipment are low, the alkaline medium has little corrosion to the equipment, the operation is safe, and the benefit of the comprehensive recycle of the valuable metal is good.

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