Treatment method for high-bismuth lead anode mud or bismuth slags

Abstract

The invention discloses a treatment method for high-bismuth lead anode mud or bismuth slags. The method is characterized in that SnCl4 and HCl are used as a leaching agent; the high-bismuth lead anode mud or bismuth slags are directly leached through oxidization to obtain bismuth-containing lixivium and leaching residue enriched with gold and silver; then the bismuth-containing lixivium is subjected to bismuth powder reduction purification; and silver ions in the lixivium are substituted into the residue; a certain amount of a precipitant is added in the liquid subjected to substitution, and the acidity of the liquid is adjusted with H2SO4, so that As3+, Pb2+, Cu2+ and Sb3+ in the solution are precipitated in the residue; and Pb2+ and As3+ ions in the liquid subjected to precipitation are further removed with a double-salt purification method. The purified liquid is subjected to diaphragm electrodeposition for extracting bismuth; after the bismuth is extracted, cathode liquid and anode liquid are mixed, and the solution is subjected to substitution treatment by using tin powder as a purification agent; and the liquid subjected to substitution is subjected to acid adjustment and then returns to be used for leaching the high-bismuth lead anode mud as a leaching agent. By adopting the technique, bismuth, lead, stibium, arsenic and copper in the high-bismuth lead anode mud or bismuth slags are extracted in a classified manner; gold and silver and gathered; closed-loop circulation of a technique process is realized; and the treatment method has the distinctive advantages of being high in raw material adaptability, simple in technique process, high in valuable element recycle rate, clean and environment-friendly.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a treatment method for high-bismuth-lead anode slime or bismuth slag. Background technique [0002] During the electrolytic refining of crude lead, because the standard electrode potential of Sb, As, Bi, Cu, Ag, Au and other metals is more positive than that of Pb, these metals are rarely dissolved into the electrolyte but adhere to the surface of the anode in solid form or fall off the electrolytic tank Anode slime is formed in the anode slime, because it is enriched with 5-30% bismuth, 5-45% antimony, 1-10% copper, 1-20% bismuth, 10-1500g / t gold, 1-20% Silver and 5-30% lead, 0.1-30% arsenic and other elements, so it is of great significance to realize its clean treatment and efficient recycling. Especially in recent years, the proportion of high-bismuth lead raw materials has gradually increased, and the bismuth content in the anode slime obtained during the electrol...

AI Technical Summary

Problems solved by technology

These methods avoid smoke and dust pollution in the fire process and improve working conditions, but there are still disadvantages such as complicated procedures, easy dispersion of gold and silver in the oxidation leaching process, large consumption of reagents, and difficult separation.