Wet treatment method for recycling copper and zinc in bismuth middlings

Abstract

The invention relates to a wet treatment method for recycling copper and zinc in bismuth middlings. The wet treatment method comprises the steps that the bismuth middlings are subjected to wet grinding into powder in which minus 160 mesh-powder occupies 98%, the powder and diluted zinc electrolysis effluent are subjected to slurrying, preimpregnation and filtration, and filtrate of which the finalacidity is 20 g / L to 30 g / L and filter residues are obtained; the filter residues are subjected to high-temperature roasting desulfuration into oxides, bismuth oxides and bismuth concentrate are subjected to mixing and smelting into raw bismuth; after pH of the filtrate is adjusted to 1.5 to 2.0, filtrate is subjected to 3-grade counter-current extraction, 2-grade washing and 2-grade reverse extraction through 20%+80%N902 kerosene, a copper sulfate solution is obtained, the copper sulfate solution enters a copper electrodeposition system, and 99.9% cathode copper is separated at a cathode; copper extraction raffinate is neutralized, iron is removed, impurity elements like copper and cadmium are removed from zinc powder, a liquid is extracted and purified through 40%+60%P204 kerosene, anda zinc sulfate solution is obtained through 4-grade counter-current extraction, 3-grade washing and 3-grade reverse extraction; and oil in the zinc sulfate solution is absorbed through a degreaser, and the zinc sulfate solution is introduced into a zinc electrodeposition system to be subjected to zinc electrodeposition. According to the wet treatment method, material consumption is low, the automation degree is high, waste water, wastes and waste residues are not generated during the production process, and a pollution-free clean technology is adopted.

Description

technical field [0001] The invention relates to the field of nonferrous metal metallurgy, in particular to a wet treatment method for recovering copper and zinc in bismuth ore. Background technique [0002] Bismuth rarely produces deposits alone, and most of them are symbiotic with copper, zinc, lead, tin, iron and other metal elements. For bismuth-containing minerals, the beneficiation process is generally adopted to produce bismuth concentrates with higher bismuth content and low-grade bismuth medium ores. The reduction smelting of bismuth concentrate produces rough bismuth, and the rough bismuth is obtained by fire refining and electrolytic refining to obtain refined bismuth. With the improvement of rough refining technology, the quality of crude bismuth is improved, and impurities are reduced. Fire refining has gradually replaced electrolytic refining. At present, only a few bismuth refining enterprises use electrolytic refining less. [0003] Bismuth ore contains low ...

AI Technical Summary

Problems solved by technology

The disadvantage of leaching with ferric chloride is that the content of divalent iron ions in the leaching solution is relatively large, which makes it difficult to separate and purify the leaching solution. The high concentration of chloride ions in the solution also requires the equipment to have anti-corrosion capabilities.

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