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Method for removing iron and arsenic in copper sulfate solution

A technology of copper sulfate solution and copper sulfate, which is applied in the field of removing arsenic and iron from copper sulfate solution, can solve problems such as narrow application range, and achieve the effect of short process and low cost

Inactive Publication Date: 2015-08-19
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method will Na + , Cl - Other impurities are introduced into the copper sulfate solution, and the application range is narrow

Method used

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  • Method for removing iron and arsenic in copper sulfate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) take 1m 3 Copper sulfate solution is put into stirring tank, and composition is: Cu 69.36g / L, full Fe 4.50g / L (wherein Fe 2+ accounted for 30%), all As 2.61g / L (of which As 3+ 70%), H 2 SO 4 23.87g / L, start stirring and add copper hydroxide slag to adjust the pH of the solution to 1.0.

[0032] 2) Mole ratio H 2 o 2 :( 2+ +As 3+ )=2.0:1, add 4.5L of industrial-grade hydrogen peroxide, use a connecting pipe to add industrial-grade hydrogen peroxide to the bottom of the stirring tank, add slowly, complete the adding process in 10 minutes, and control the oxidation time to 2.0h.

[0033] 3) Add copper hydroxide slag again, the reaction time is 3.0 h, and the end point pH is 3.5.

[0034] 4) Separation of liquid and solid, washing of the filter cake to obtain 1.2m copper sulfate solution for removing iron and arsenic 3 (including filter cake washing water), the composition is: Cu 70.08g / L, Fe 0.03g / L, As 0.09g / L. The iron removal rate is 99.20%, and the arsenic...

Embodiment 2

[0037] 1) take 1m 3 Copper sulfate solution, composition is: Cu 53.25g / L, full Fe 7.43g / L (wherein Fe 2+ accounted for 40%), all As 6.64g / L (of which As 3+ 55%), H 2 SO 4 26.54g / L, start stirring and add copper hydroxide slag to adjust the pH of the solution to 1.0.

[0038] 2) Mole ratio H 2 o 2 :( 2+ +As 3+ )=3.0:1, add 9.45L of industrial-grade hydrogen peroxide, use a connecting pipe to add industrial-grade hydrogen peroxide to the bottom of the stirring tank, add slowly, complete the adding process in 10 minutes, and control the oxidation time to 1.5h.

[0039] 3) Add copper hydroxide slag again, the reaction time is 2.5 h, and the end point pH is 3.0.

[0040] 4) Separation of liquid and solid, washing of the filter cake to obtain 1.3m copper sulfate solution for removing iron and arsenic 3 (including filter cake washing water), the composition is: Cu 53.96g / L, Fe 0.01g / L, As 0.07g / L. The iron removal rate is 99.80%, and the arsenic removal rate is 98.63%.

[...

Embodiment 3

[0043] 1) take 1m 3 Copper sulfate solution, composition is: Cu 63.32g / L, full Fe 3.37g / L (wherein Fe 2+ accounted for 25%), all As 2.66g / L (of which As 3+ 40%), H 2 SO 4 32.57g / L, start stirring and add copper hydroxide slag to adjust the pH of the solution to 1.5.

[0044] 2) Mole ratio H 2 o 2 :( 2+ +As 3+ )=2.5:1, add 2.26L of industrial-grade hydrogen peroxide, use a connecting pipe to add industrial-grade hydrogen peroxide to the bottom of the stirring tank, add slowly, complete the adding process in 10 minutes, and control the oxidation time to 0.5h.

[0045] 3) Add copper hydroxide slag again, the reaction time is 1.5 h, and the end point pH is 2.5.

[0046] 4) Separation of liquid and solid, washing of the filter cake to obtain 1.2m copper sulfate solution for removing iron and arsenic 3 (including filter cake washing water), the composition is: Cu 67.85g / L, Fe 0.02g / L, As 0.07g / L. The iron removal rate is 99.29%, and the arsenic removal rate is 96.84%.

[...

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Abstract

The invention relates to a method for removing iron and arsenic in a copper sulfate solution and belongs to the field of nonferrous metal hydrometallurgy. The method comprises the following steps: under a stirring condition, adding copper hydroxide slag to a copper sulfate solution containing a certain amount of iron and arsenic, controlling the pH of the solution to the range of 1.0-2.0, adding industrial-grade hydrogen peroxide in a certain molar ratio according to the content of iron and arsenic in the solution to oxidize the low-valence state iron and arsenic in the solution, and then adding the copper hydroxide slag again, controlling the final pH to the range of 2.0-3.5, and after liquid-solid separation, crystalizing the solution removed from iron and arsenic to prepare a copper sulfate product or an electro-deposited cathode copper product, and treating the filter cake in a lead smelting system. The method is capable of efficiently removing the iron and arsenic in the copper sulfate solution; the iron removal rate is within the range of 99.20-99.80% and the arsenic removal rate is within the range of 95.86-99.22%; and no impurity ion is introduced in the whole process, and the whole process is clean and efficient in production.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal hydrometallurgy, and in particular relates to a method for removing iron and arsenic in copper sulfate solution. Background technique [0002] When the copper-containing slag material is used to leach copper with oxidant and sulfuric acid to obtain a copper sulfate solution, part of the iron and arsenic in the copper-containing slag material will enter the copper sulfate solution; use the obtained copper sulfate solution to prepare copper sulfate pentahydrate. Or in the process of cathode copper production, as the crystallization mother liquor or electrowinning waste liquor returns and circulates to leach copper, the iron and arsenic in the copper sulfate solution will gradually enrich, which will affect the product quality, limit the use of the product, or cause the During production, the technical and economic indicators decrease and the cost increases. [0003] For the removal of iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44
CPCY02P10/20
Inventor 晋家强刘艳涛余国林翟琳娜应希源
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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