Method for comprehensively extracting arsenic from waste acid and smoke dust in copper smelting industry

A comprehensive extraction and copper smelting technology, applied in the extraction of arsenic, the comprehensive extraction of arsenic from polluted acid and smoke in the copper smelting industry, to achieve the effect of maximizing resource utilization and maximizing harmlessness

Pending Publication Date: 2019-10-15
DONGYING FANGYUAN NONFERROUS METALS +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of joint treatment of dirty acid and smoke dust, the present invention propo

Method used

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  • Method for comprehensively extracting arsenic from waste acid and smoke dust in copper smelting industry

Examples

Experimental program
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Example Embodiment

[0022] Example 1

[0023] 1. Oxidation leaching

[0024] Slurry acid and smoke dust are slurried according to the liquid-solid ratio (the ratio of liquid volume L to solid weight Kg) 3:1, the temperature is 80°C, air is introduced, the air flow rate is 3 L / min, oxidation leaching is carried out for 4 hours, and the reaction is carried out after the reaction is completed. The leachate and filter residue are obtained by solid-liquid separation, the leachate enters the next process, and the filter residue is used to further recover lead and bismuth. The leaching rates of copper and arsenic were 95.5% and 94.1%, respectively.

[0025] 2. Copper sulfide

[0026] According to the molar ratio of the copper content of the leachate to the sulfur of the vulcanizing agent is 1:1.1, sodium sulfide solution is added to the leachate, the temperature is 70°C, and the reaction is carried out for 2 hours. The copper liquid enters the next process, and the copper sulfide is decopper smelted ...

Example Embodiment

[0029] Example 2

[0030] 1. Oxidation leaching

[0031] Slurry acid and smoke dust are slurried according to the liquid-solid ratio (the ratio of liquid volume L to solid weight Kg) 4:1, the temperature is 90 ° C, air is introduced, the air flow rate is 4 L / min, oxidation leaching is carried out for 5 hours, and the reaction is carried out after the reaction is completed. The leachate and filter residue are obtained by solid-liquid separation, the leachate enters the next process, and the filter residue is used to further recover lead and bismuth. The leaching rates of copper and arsenic were 95.8% and 94.3%, respectively.

[0032] 2. Copper sulfide

[0033] According to the molar ratio of the copper content of the leachate to the sulfur of the vulcanizing agent is 1:1.2, sodium sulfide solution is added to the leachate, the temperature is 80°C, and the reaction is carried out for 1 hour. The copper liquid enters the next process, and the copper sulfide is decopper smelted...

Example Embodiment

[0036] Example 3

[0037] 1. Oxidation leaching

[0038] Slurry acid and smoke dust are slurried according to the liquid-solid ratio (the ratio of liquid volume L to solid weight Kg) 5:1, the temperature is 90°C, air is introduced, the air flow rate is 5 L / min, oxidation leaching is carried out for 6 hours, and the reaction is carried out after the reaction is completed. The leachate and filter residue are obtained by solid-liquid separation, the leachate enters the next process, and the filter residue is used to further recover lead and bismuth. The leaching rates of copper and arsenic were 96.3% and 95.7%, respectively.

[0039] 2. Copper sulfide

[0040] According to the molar ratio of the copper content of the leachate to the sulfur of the vulcanizing agent is 1:1.2, sodium sulfide solution is added to the leachate, the temperature is 70 ° C, and the reaction is carried out for 1 hour. The copper liquid enters the next process, and the copper sulfide is decopper smelted...

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Abstract

The invention discloses a method for comprehensively extracting arsenic from waste acid and smoke dust in the copper smelting industry, and belongs to the field of nonferrous metallurgy. The method comprises the steps of mixing and leaching the waste acid and the smoke dust, simultaneously introducing air, and enriching the arsenic into a leaching solution; adding a vulcanizing agent into the leaching solution to obtain copper sulfide and a solution after copper precipitation; introducing sulfur dioxide or flue gas after copper smelting purification into the solution after copper precipitation, carrying out arsenic reduction, cooling, crystallizing and separating out arsenic trioxide, and separating to obtain arsenic trioxide and the solution after arsenic precipitation; and enriching other valuable metals in a leaching process of the solution after arsenic precipitation, and further processing and extracting other valuable metal elements after enriching to a certain extent. By means of the method, the combined treatment of copper smelting waste acid and a smoke dust source is achieved, the dispersion of arsenic is reduced, the generation of an arsenic-containing intermediate product is reduced, the direct yield of arsenic is reduced, and the development of arsenic is opened by an arsenic trioxide product; and the method has the advantages of simple process, resource utilization, safety, environmental-friendliness and the like.

Description

technical field [0001] The invention relates to a method for extracting arsenic, in particular to a method for comprehensively extracting arsenic from polluted acid and dust in copper smelting industry, belonging to the field of nonferrous metallurgy. Background technique [0002] At present, the raw material for copper smelting is mainly copper sulfide concentrate, but the rich ore of copper sulfide concentrate is less and less, and the arsenic content in copper sulfide concentrate is increasing day by day. During the copper smelting process, arsenic mainly enters the smelting flue gas, part of which enters the dirty acid produced by flue gas purification, and part of it enters the smelting dust. With the innovation and development of copper smelting technology, the ability to remove arsenic in the smelting process has been significantly improved, and the content of arsenic in dirty acid and smoke is getting higher and higher. [0003] The separate treatment of dirty acid ...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B7/00C22B1/00C22B30/04C22B15/00C01G28/00
CPCC01G28/005C22B1/005C22B7/006C22B7/02C22B15/0065C22B30/04Y02P10/20
Inventor 崔志祥王海滨王智高中学雒庆堂蔺庆武崔文昭边瑞民陈永鑫
Owner DONGYING FANGYUAN NONFERROUS METALS
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