Method for removing and recovering arsenic from lead anode slime

Abstract

The invention discloses a method for removing and recovering arsenic from lead anode slime, which comprises the following steps of: performing screening, hot water washing and baking on the lead anode slime, performing oxidation leaching by controlling potential in sodium hydroxide solution, oxidizing the arsenic by using compressed air and hydrogen peroxide as oxidants respectively, adding the oxidized arsenic into alkaline leachate, and ensuring metals such as bismuth, lead, stibium and copper are oxidized and then enter alkaline leaching residue together with noble metals; and after alkaline oxidization leaching process is finished, filtering while hot, performing cooling crystallization on the leachate to generate sodium arsenate crystals, supplementing certain sodium hydroxide to crystallization mother liquor, returning the crystallization mother liquor to the leaching process, and separating and recovering the arsenic and other valuable metals from the lead anode slime. The arsenic leaching rate is over 98.0 percent and the secondary arsenic pollution is free; and the method has the advantages of low requirement on equipment materials, safe operation, low labor intensity, short treatment time and good operating environment.

Description

technical field The invention relates to a hydrometallurgical process in the field of metallurgy, in particular to a hydrometallurgical method for effectively removing and recovering arsenic from lead anode slime. Background technique Lead anode slime is composed of various components that are insoluble in the electrolyte during the electrolytic refining process of crude lead. Its composition and yield mainly depend on factors such as anode composition, casting quality and electrolysis technical conditions. The yield of lead electrolytic anode slime fluctuates 0.9~1.8%, moisture content about 35~40%, anode slime mainly contains arsenic, lead, antimony, bismuth, copper, gold, silver and scattered metals, etc. Therefore, lead anode slime is used to extract antimony, bismuth and rare precious metals, etc. important raw materials. Due to the depletion of mineral resources, high-arsenic lead ores are widely used in the smelting process of lead, which makes the content of arsenic...

AI Technical Summary

Problems solved by technology

In order to overcome the deficiencies of the existing lead anode slime dearsenic pretreatment method, the purpose of the present invention is to provide a method for effectively removing and reclaiming arsenic in lead anode slime in sodium hydroxide solution

Images