Compound technology for removing As, Sb, Bi by utilizing copper electrolyte

Abstract

The invention discloses a compound technology for removing, Sb, Bi by utilizing copper electrolyte. A process for removing As by means of solvent extraction and a process of removing Sb and Bi by means of solution self-purification are combined; copper arsenite crystals are prepared by As in a back-extraction solution and is used as a high arsenic electrolytic additive; during high arsenic electrolysis, Sb and Bi in the solution can be effectively removed through As (III), and a majority of Sb and Bi in an anode plate enter anode mud. According to the compound technology, the aims of removing As, Sb and Bi can be fulfilled; meanwhile, an electro-deposition induced decoppering and dearsenification method is eliminated in the main process, and a small quantity of nickel removal liquid in the auxiliary process needs to be subjected to electro-deposition treatment. The compound technology is low in power consumption; the amount of H3As gas, black copper plates and black copper powder is obviously reduced; a dearsenification product is sold in a form of As2O3 or stacked in a form of calcium arsenate. According to the method, the operating environment is optimized, the defects that the As removal product contains a large amount of copper in the electro-deposition induced decoppering and dearsenification method and needs to be returned to a pyrogenic process system for separating copper and arsenic are overcome; the electro-deposition during the main impurity removal process is avoided, and the energy consumption is obviously reduced.

Description

[0001] technical field [0002] The invention relates to a composite process for removing As, Sb and Bi from a copper electrolyte, which is applied to the impurity removal process of the copper smelting electrolyte, is applicable to copper anode plates with various As, Sb and Bi contents, and belongs to the technical field of metallurgy. Background technique [0003] At present, the purification of As, Sb, and Bi in the electrolyte of copper smelters generally adopts the method of electrowinning to induce decopper and arsenic. This method consumes a lot of electricity and is prone to produce highly toxic H 3 As gas, the arsenic removal product contains a large amount of copper, which needs to be returned to the thermal system to separate copper and arsenic, which increases production costs and causes arsenic enrichment in the system. [0004] The solvent extraction method and the solution self-purification method can selectively remove As, Sb, and Bi, and reduce the net liq...

AI Technical Summary

Problems solved by technology

However, copper arsenite needs to be prepared separately, and the cost is high. The excess As in the electrolyte is still removed by electrowinning-induced decopper and arsenic removal, which is prone to produce highly toxic H 3 As gas, As mainly enters the black copper plate and black copper powder, and needs to be returned to the fire system for treatment, so that As can be enriched in the fire system, which cannot solve the open circuit problem of As

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