Comprehensive recovery method for arsenic in arsenic sulfide residues and smoke leaching liquid in copper smelting

Abstract

The invention provides a comprehensive recovery method for arsenic in arsenic sulfide residues and a smoke leaching liquid in copper smelting. The smoke leaching liquid and the arsenic sulfide residues are subjected to normal-pressure vulcanization copper precipitation treatment to obtain solid state copper sulphide and a vulcanized liquid; the vulcanized liquid is discharged into a reaction tankII, and sulfur dioxide is introduced into the reaction tank II to make the vulcanized liquid converted into an arsenic-containing mother liquid; the arsenic-containing mother liquid is discharged intoa reaction tank III, the arsenic-containing mother liquid is subjected to concentration and crystallization, and filtration is performed to obtain a sulfate mixed crystal and a concentrated liquid; the sulfate mixed crystal is added into a reaction tank IV, copper sulfate and zinc sulfate in the sulfate mixed crystal are dissolved into water, and filtration is performed to obtain arsenic oxide and a solution of the copper sulfate and the zinc sulfate. The method provided by the invention has the advantages that the process collocation is reasonable, parameters in each process are strictly controlled, the arsenic can be safely disposed, and valuable elements such as copper, lead and zinc are recycled and effectively utilized, the purposes of environmental protection, economy, energy conservation and a high resource utilization rate are achieved, and harmlessness and resource utilization maximization of the arsenic are realized.

Description

technical field [0001] The invention relates to the field of copper smelting recovery, in particular to a comprehensive recovery method for copper smelting arsenic sulfide slag and arsenic leachate from smoke and dust. Background technique [0002] Copper, gold, silver and other non-ferrous metal ores usually contain arsenic. Arsenic enters the smelter along with the concentrate, and enters the flue gas, waste water, and waste residue in the form of sulfide or salt during the non-ferrous metallurgical process, and produces hazardous waste containing arsenic. During the copper smelting process, arsenic mainly enters the smelting flue gas, part of it enters the dirty acid produced by flue gas purification, and part of it enters the smelting soot. At present, the arsenic in the sewage acid adopts the process of sulfide precipitation to produce arsenic sulfide slag. The arsenic in the soot is leached by acid and solidified to produce calcium arsenate. Both arsenic sulfide slag...

AI Technical Summary

Problems solved by technology

[0004] Arsenic sulfide slag and smoke leachate are treated separately, which cannot produce greater economic benefits, and the treatment process requires a large amount of chemicals, the process is complicated, and some processes have occupational health hazards

There are still many research papers and related patent reports on the removal of arsenic from arsenic sulfide slag and soot and the extraction of valuable metals, and there are still low comprehensive recovery rates of valuable elements and potential safety hazards

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