Treatment method for bismuth anode slime

Abstract

The invention discloses a treatment method for bismuth anode slime. The treatment method comprises the following steps that a, antimony white and crude bismuth are separated through a reverberating furnace, specifically, the bismuth anode slime is input into the reverberating furnace to be refined for four days, the antimony white component containing 70% or above of Sb2O3 is separated out, and a bottom solution is discharged to be cast into the crude bismuth; b, copper is removed from the crude bismuth, specifically, the obtained crude bismuth is placed into a boiler for conducting liguation and sulfdization decoppering, noble bismuth is obtained, and copper slag is delivered to be treated with a wet method; c, primary vacuum distillation is conducted, specifically, the obtained noble bismuth is placed into a vacuum smelting furnace to be distilled with the pressure being -10Pa and the temperature being 900 DEG C, a gaseous state bismuth-lead alloy is separated out, and a liquid state substance is a bismuth-silver alloy; d, chlorination de-leading is conducted, specifically, the gaseous state bismuth-lead alloy obtained in primary vacuum distillation is condensed into a liquid state and subjected to chlorination de-leading, so that refined bismuth with the purity being 99% or above is obtained; and e, secondary distillation is conducted, specifically, the liquid state bismuth-silver alloy obtained in primary vacuum distillation is placed in to the vacuum smelting furnace to be subjected to secondary distillation, and crude silver with the purity being 90% or above and a bismuth alloy containing 69% or above of bismuth are separated out from the bismuth-silver alloy.

Description

technical field [0001] The invention relates to a method for treating anode slime, in particular to a method for treating bismuth anode slime. Background technique [0002] A large amount of bismuth anode slime is produced during the refining process of bismuth. Bismuth anode slime also contains a large amount of precious metals, mainly bismuth and silver. It is of great economic value to recycle bismuth anode slime and collect bismuth and silver from it. [0003] The traditional bismuth anode slime treatment method is pyro-refining, including the following operations: blast furnace→coarse bismuth→smelting and adding sulfur to remove copper→chlorination to remove Sb→alkaline oxidation to remove Te→chlorination to remove Pb→adding zinc to remove Ag → Zinc removal → finished product. In the above operations, the process of adding zinc and removing silver is one of the important steps. The process of removing silver from coarse bismuth requires adding zinc several times to p...

AI Technical Summary

Problems solved by technology

The above method has a long and complicated process, consumes a lot, has a lot of intermediate products, the recovery rate of metals is not high, and the recovery cost is high.

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