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Method of removing arsenic from acid arsenic-containing solution

A solution and acidic technology, applied in the direction of improving process efficiency, etc., can solve the problems of low arsenic removal rate, high production cost, lengthy process flow, etc., and achieve the effect of easy control of process parameters, low cost and simple process

Inactive Publication Date: 2016-11-23
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Although some of the above-mentioned methods have been successfully applied in industry, the methods for removing arsenic in the above-mentioned acidic solution generally have high production cost, low arsenic removal rate, long process flow, and recovery of valuable metal products. High arsenic content, unstable precipitation of iron arsenate

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Embodiment 1

[0048] A method for removing arsenic from an acidic arsenic-containing solution according to the present invention. In this embodiment, the acidic arsenic-containing solution is specifically an acidic leaching solution of copper fumes, and the acid in the acidic leaching solution is sulfuric acid. The main components of the acidic leaching solution of copper fume are (g / L): Cu26.35, As 25.89, Fe 1.15, Zn 1.49, Cd 0.30. The method of this embodiment is as figure 1 shown, including the following steps:

[0049] (1) Add iron powder to the acidic arsenic-containing solution, the molar ratio of the iron in the iron powder to the copper in the acidic arsenic-containing solution is 1.4:1, stir and react at 50°C for 1.5h, replace and remove copper, and replace copper The efficiency is 99.5%. After filtration, sponge copper and copper-removing liquid are obtained. The main components of the solution after copper removal are (g / L): Cu 0.129, As 22.093, Fe 28.73, Zn 1.32, Cd 0.26.

[...

Embodiment 2

[0053] A method for removing arsenic from an acidic arsenic-containing solution according to the present invention. In this embodiment, the acidic arsenic-containing solution is specifically an acidic leaching solution of copper fumes, and the acid in the acidic leaching solution is sulfuric acid. The main components of the acidic leaching solution of copper fume are (g / L): Cu13.88, As 11.71, Fe 0.67, Zn 1.12, Cd 0.53. The method of this embodiment is as figure 1 shown, including the following steps:

[0054] (1) Add iron powder to the acidic arsenic-containing solution, the molar ratio of iron in the iron powder to copper in the acidic arsenic-containing solution is 1.3:1, stir and react at 60°C for 1.5h, replace and remove copper, and replace copper The efficiency is 99.2%. Sponge copper and copper removal solution are obtained after filtration. The main components of the solution after copper removal are (g / L): Cu 0.107, As 11.250, Fe 32.68, Zn 0.99, Cd 0.47.

[0055] (2...

Embodiment 3

[0058] A method for removing arsenic from an acidic arsenic-containing solution according to the present invention. In this embodiment, the acidic arsenic-containing solution is specifically an acidic leaching solution of copper fumes, and the acid in the acidic leaching solution is sulfuric acid. The main components of acidic leaching solution of copper fume are (g / L): Cu10.80, As 9.98, Fe 2.21, Zn 1.23, Cd 0.46. The method of this embodiment is as figure 1 shown, including the following steps:

[0059] (1) Add iron powder to the acidic arsenic-containing solution, the molar ratio of iron in the iron powder to copper in the acidic arsenic-containing solution is 1.4:1, stir and react at 60°C for 1.5h, replace and remove copper, and replace copper The efficiency is 99.6%. After filtration, sponge copper and copper-removing liquid are obtained. The main components of the solution after copper removal are (g / L): Cu 0.041, As 9.590, Fe 12.98, Zn 1.03, Cd 0.42.

[0060] (2) Take...

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Abstract

The invention discloses a method of removing arsenic from an acid arsenic-containing solution. The method comprises the following steps: the pH value of the acid arsenic-containing solution is adjusted to be 1.0-5.0, an iron-containing material and an oxidizing agent are added, the temperature of the solution is controlled at 25-90 degrees, after reaction, ferric arsenate sediment and arsenic-removed post liquid are obtained, and the removal of arsenic is realized. When copper contained in the acid arsenic-containing solution is greater than or equal to 0.2g / L, iron powder replacement copper removal treatment is required to be carried out first. The method has the advantages that the method is simple in process, low in cost and high in arsenic removal rate and obtained ferric arsenate sediment is stable; valuable metals can be recycled effectively; and the method has very high practicability and economic value.

Description

technical field [0001] The invention relates to a method for removing arsenic from an acidic arsenic-containing solution, in particular to a method for removing arsenic from nonferrous metallurgy or chemical industry, such as copper fume, black copper slag, high-arsenic-lead fume, antimony smelting high-arsenic fume, tin smelting fume, A method for removing arsenic from gold smelting arsenic-containing fumes and other arsenic-containing waste materials in acidic leaching solutions, especially a method for removing arsenic in the solution in the form of iron arsenate under low pH conditions. Background technique [0002] Arsenic is a non-metal, and almost all arsenic and its compounds are highly toxic. The state of arsenic in nature is stable, and the toxicity of trivalent arsenic in the environment is 60 times higher than that of pentavalent arsenic. my country is currently one of the countries with the most serious arsenic pollution in the world, and the situation of pollu...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B7/02C22B15/00
CPCC22B7/006C22B7/02C22B15/0091Y02P10/20
Inventor 蒋晓云赵思佳易亚男祝秋萍
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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