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Method for separating copper, arsenic and zinc from copper-smelting high-arsenic flue dust sulphuric acid leach liquor

An arsenic fume, copper smelting technology, applied in the direction of improving process efficiency, can solve the problems of secondary pollution, failure to effectively control arsenic pollution, etc., achieve high recovery rate, great environmental and social significance, and control arsenic pollution. Effect

Inactive Publication Date: 2006-06-21
朱永文
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AI Technical Summary

Problems solved by technology

This process can economically recover copper and produce zinc sulfate heptahydrate, but it cannot effectively control the pollution of arsenic, because the produced iron, arsenic and calcium slag has secondary pollution

Method used

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  • Method for separating copper, arsenic and zinc from copper-smelting high-arsenic flue dust sulphuric acid leach liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0008] Composition of sulfuric acid leaching solution (g / L) of a copper smelting high-arsenic dust: Cu 6, As 10, Zn 18, H 2 SO 4 5;

[0009] Process as follows:

[0010] 1) Copper sulfide precipitation: In the stirring state of the above leaching solution, heat the steam to 50-60°C, add a sulfurizing agent of a mixture of zinc sulfide and arsenic sulfide, and carry out the copper precipitation reaction. When the reaction reaches the end, stop adding the mixture of zinc sulfide and arsenic sulfide. Plate and frame filter press, the steam is heated to above 85°C before the filter press to improve the filtration performance. Judgment method for the end point of copper sulfide precipitation: take a small amount of solution and filter it, and the filtrate has no blue color, which is the end point. The first required copper sinking vulcanizing agent reacts with zinc sulfate heptahydrate and sodium sulfide. The mass ratio of zinc sulfate heptahydrate and sodium sulfide is 2:1. Fi...

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Abstract

The invention relates the method of separating copper, arsenic and zinc from copper smelting high arsenic fog sulfuric acid leachate, comprising the following steps: adding vulcanized agent (zine sulfide and arsenic sulfide) into the leachate to make copper precipitate, separating and getting the copper scale and copper liquid; concentrating the liquid and cooling, getting the zinc sulphate heptahydrate and crystallization mother liquid; adding sulfur dioxide into the crystallization mother liquid and getting arsenious oxide and the arsenic liquid; adding sodium sulfide aqueous solution into the arsenic liquid and getting the zine sulfide and arsenic sulfide which can be used as vulcanized agent to precipitate copper. The core technology of the invention is copper precipitation by sulfidization. At the process of the copper precipitation there is not other impurity substances and the vulcanized agent is made by the flow process. The invention realizes the segregation of copper, arsenic and zinc and effectively harnesses the arsenic contamination.

Description

technical field [0001] The invention relates to a method for separating copper, arsenic and zinc from sulfuric acid leaching solution of copper smelting high-arsenic dust. Background technique [0002] The toxicity of arsenic, especially the fluidity of soluble arsenic compounds in groundwater, makes people pay more and more attention to the control of arsenic in copper smelting high arsenic dust. In the prior art, the treatment of sulfuric acid leaching solution of high arsenic dust from copper smelting mostly adopts the process of "iron scrap replacement→oxidation and neutralization to remove iron and arsenic→concentrate crystalline zinc sulfate". This process can economically recover copper and produce zinc sulfate heptahydrate, but it cannot effectively control arsenic pollution because the produced iron, arsenic and calcium slag has secondary pollution. How to control arsenic pollution has long been a social problem. Contents of the invention [0003] The purpose of...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/22C22B7/02C22B15/00C22B19/00C22B30/04
CPCY02P10/20
Inventor 朱永文
Owner 朱永文
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