A method for separating tungsten, molybdenum and bismuth in bismuth sulfide concentrate

Abstract

The invention discloses a method capable of effectively separating tungsten, molybdenum and bismuth in bismuth sulfide ore concentrate. The method comprises the following steps of: performing pressure oxidation leaching on the bismuth sulfide ore concentrate containing tungsten and molybdenum in sodium hydroxide solution, wherein the tungsten and the molybdenum enter the alkali leachate, and the bismuth and other heavy metals enter the alkali leached residue in an oxide form, so that effective separation of the tungsten, the molybdenum and the bismuth in the bismuth sulfide ore concentrate isrealized; adsorbing the tungsten and the molybdenum in the alkali leachate by using macroporous weak alkali acrylic series anion exchange resin D363 and D314 respectively; and finally, desorbing the tungsten and the molybdenum by using aqueous ammonia respectively, so that effective reclamation of the tungsten and the molybdenum in the leachate is realized. By the method, effective separation of the tungsten, the molybdenum and the bismuth in the bismuth sulfide ore concentrate is realized, the leaching rate of the tungsten and the molybdenum is over 99 percent, and the bismuth, copper and the like enter the alkali leached residue after being oxidized; the tungsten and the molybdenum in the alkali pressure leachate are adsorbed by adopting resin, and the recovery rate of the tungsten and the molybdenum is over 99 percent; and the method is low in labor intensity, short in treatment time and good in operating environment.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of metallurgy, in particular to a method for effectively separating tungsten, molybdenum and bismuth in bismuth sulfide concentrate. Background technique [0002] my country has unique mineral resources containing bismuth, tungsten and molybdenum. The bismuth concentrate produced through ore dressing usually contains a certain amount of tungsten and molybdenum. This kind of bismuth sulfide concentrate containing tungsten and molybdenum is usually directly processed by fire method and wet method. way to deal with it. [0003] The pyroprocessing process is mainly the precipitation smelting method, that is, using soda ash and fluorite as the flux, adding enough iron filings as the reducing agent, and the iron filings replace the bismuth in the bismuth sulfide concentrate at high temperature to produce coarse bismuth alloy, Soot and smelting slag, coarse bismuth alloys are then processed to...

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Problems solved by technology

[0006] (1) The pyro-smelting process requires the addition of a large amount of iron filings as a reducing agent, which not only increases production costs and energy consumption, but also produces a large amount of smelting slag and smoke. caused the dispersion loss of bismuth;

[0007] (2) The wet treatment process uses oxidation leaching in the chloride system, which has the disadvantages of serious equipment corrosion, large amount of wastewater, low bismuth recovery rate and high cost;

[0008] (3) The smelting slag produced by the pyro-smelting process needs to recover tungsten and molybdenum separately, not only the production process is long, but also the recovery rate of tungsten and molybdenum is low Complicated; the recovery of tungsten and molybdenum in the wet treatment process is difficult and the recovery cost is high

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