Oxidation oven ash hydrometallurgical leaching process

Abstract

The invention provides a leaching process of the oxidation oven soot wet method, belonging to the treatment on side products of soot generated in the smelting process technical field. In the process, antimony oxide and arsenic oxide in the oxidation oven soot are simultaneously leached out by the reducing capacity of sodium sulphide first, and generated sodium thioadtimonate and sodium sulfarsenate enter leaching liquid; filter residues are returned for silver smelting reduction smelting; the leaching liquid is passed through air, the sodium thioadtimonate is oxidized into sodium antimonate, free sulfurs in the sodium antimonate are separated by filtering; the mixed filtrate of the sodium antimonate and the sodium sulfarsenate has coarse sodium antimonate crystals extracted by condensed crystallization; and the remained sodium sulfarsenate liquid is taken as waste liquid for reclaiming treatment, so that the effective separation of Pb and Ag and Sb and As is realized. The process of the invention can effectively reduce the quantity of soot returned to the oven for smelting, improving the capability of a reducing furnace for treating anode mud and achieving the double-win aims of improving the efficiency of the reducing furnace and reducing environmental pollution.

Description

technical field [0001] The invention relates to a treatment process for soot by-products produced in the process of smelting silver, bismuth and other precious metal products, in particular to an oxidation furnace soot wet leaching process. Background technique [0002] At present, rare and precious metal products such as silver and bismuth produced by most precious metal smelting enterprises in my country are all extracted and processed from electrolytic lead anode slime by pyrolysis. These processes all produce a large amount of soot, among which the soot produced by the oxidation furnace is called the soot of the oxidation furnace. The soot is composed of oxides of various metals, including 1.8% silver, 9-12% arsenic, and 30-40% antimony. Due to the high silver content, it is not suitable for direct export (the price of soot containing silver is low. ); Direct discharge is neither economical nor pollutes the environment. In order to improve the recovery rate of precious ...

AI Technical Summary

Problems solved by technology

The soot is composed of oxides of various metals, including 1.8% silver, 9-12% arsenic, and 30-40% antimony. Due to the high silver content, it is not suitable for direct export (the price of soot containing silver is low. ); direct discharge is neither economical nor pollutes the environment

In order to improve the recovery rate of precious metal silver, all the soot from the current oxidation furnace is returned to the reduction furnace for production, which occupies the feeding space of the reduction furnace and reduces the input of anode slime by about 1 / 4, so that the treatment capacity of anode slime cannot meet the design requirements

Moreover, harmful oxides such as arsenic and antimony returned to the reduction furnace along with the soot will cause secondary pollution to the environment during the reduction smelting process

[0003] Regarding the oxidation furnace soot wet leaching process, there is no relevant report in the relevant literature

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