Method for recovering lead, copper and arsenic from white smoke dust

Abstract

The invention discloses a method for recovering lead, copper and arsenic from white smoke dust. The method specifically comprises the following steps that the white smoke dust is brought into ammoniawater for ammonia leaching treatment, pressurizing and filtering are carried out, an obtained solid is washed to obtain lead mud, then high-pressure hydrogen reduction treatment is carried out on a filtrate, an obtained solid is washed and dried to obtain copper powder, then lime is added into the filtrate obtained in the previous step, arsenic precipitation and ammonia water regeneration treatment are carried out, namely the lime is added for reaction, filtering is carried out on an obtained product after the reaction is ended, wherein the filtered filtrate is used as the ammonia water in thesteps in a cyclic mode, a filtered solid is washed and dried to obtain calcium arsenate, finally vacuum carbon reduction treatment is carried out on the calcium arsenate, and reactants are separatedto obtain calcium oxide and the metal arsenic. According to the method, metal in white smoke dust generated in the nonferrous metal smelting process is recovered, so that the environmental pollution is reduced, and recovery of the valuable metal and cyclic utilization of resources are realized.

Description

technical field [0001] The invention relates to the field of nonferrous metal smelting, in particular to a method for recovering lead, copper and arsenic from white smoke. Background technique [0002] During the smelting process of non-ferrous metals, white fumes are often produced. Most of the white fumes are rich in copper, arsenic, lead and other precious metals. If the white fumes are discharged directly, the environment will be seriously polluted. The return of the gas to the smelting system for processing will cause the accumulation of harmful elements such as precious metals in the system, reduce the processing capacity of the smelting furnace, and affect normal production and product quality. Therefore, it is necessary to collect and treat white smoke. At present, although there are various white soot treatment methods to recover valuable metals in white soot, the existing recovery process can only recover a single metal, and the reactants produced in the reaction p...

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Problems solved by technology

[0002] During the smelting process of non-ferrous metals, white fumes are often produced. Most of the white fumes are rich in copper, arsenic, lead and other precious metals. If the white fumes are discharged directly, the environment will be seriously polluted. The return of the gas to the smelting system for processing will cause the accumulation of harmful elements such as precious metals in the system, reduce the processing capacity of the smelting furnace, and affect normal production and product quality. Therefore, it is necessary to collect and treat white smoke

At present, although there are various white soot treatment methods to recover valuable metals in white soot, the existing recovery process can only recover a single metal, and the reactants produced in the reaction process cannot be recycled, so it is impossible to recover the valuable metals in white soot. Full utilization of resources, low recycling efficiency

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