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Method for recovering cadmium from copper cadmium residues

A technology for copper cadmium slag and copper liquid is applied in the field of cadmium recovery, which can solve the problems of large consumption of zinc powder, complicated recovery process of cadmium, low recovery rate of cadmium, etc., so as to reduce the consumption of zinc powder, the steps of zinc powder replacement and the consumption of zinc powder. volume reduction effect

Inactive Publication Date: 2012-06-27
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention solves the technical problems of complex cadmium recovery process, low cadmium recovery rate, large zinc powder consumption and bad recovery environment in the existing zinc hydrometallurgy process

Method used

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  • Method for recovering cadmium from copper cadmium residues
  • Method for recovering cadmium from copper cadmium residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Sulfuric acid leaching: immerse copper cadmium residue in sulfuric acid at 85°C, the concentration of sulfuric acid is 8g / L, and filter to obtain leachate. The components of the leachate are: Cd 21.55g / L, Zn 170.97g / L, Fe 1.43g / L, Cu 0.081g / L, Sn 0.0073g / L, Pb 0.096g / L, As 0.010g / L, Sb 0.0064g / L, endpoint pH=2.5.

[0055] (2) Purify and remove copper: raise the temperature of the leaching solution in step (1) to 52°C, add 310g of fresh cadmium sponge (1.5 times the theoretical consumption) under stirring; check the pH of the solution during the addition process, when the pH is low, Appropriately add fresh cadmium cotton, control the end point pH=3.6, and obtain the copper removal solution after filtration.

[0056] (3) Oxidative iron removal: heat up the copper removal solution in step (2) to 58°C, add 31L of hydrogen peroxide (1.3 times the theoretical consumption) under stirring, take a sample for As and Sb after a reaction time of 30 minutes, and filter it after ...

Embodiment 2

[0062] (1) Sulfuric acid leaching: soak copper cadmium slag in sulfuric acid at 90°C. The acidity of sulfuric acid is 10g / L. After filtration, the leachate is obtained. The components of the leachate are: Cd 24.38g / L, Zn 182.11g / L, Fe 1.98g / L, Cu 0.095g / L, Sn 0.0054g / L, Pb 0.088g / L, As 0.009g / L, Sb 0.0072g / L, endpoint pH=3.0.

[0063] (2) Purify and remove copper: raise the temperature of the leaching solution in step (1) to 58°C, add 436g of fresh cadmium sponge (1.8 times the theoretical consumption) under stirring; check the pH of the solution during the addition process, when the pH is low, Appropriately add fresh cadmium cotton, control the end point pH=3.2, and obtain the copper removal solution after filtration.

[0064] (3) Oxidative iron removal: raise the temperature of the copper removal solution in step (2) to 57°C, add 46L hydrogen peroxide (1.4 times the theoretical consumption) under stirring, take a sample after 24 minutes to test As and Sb, and filter it after...

Embodiment 3

[0070] (1) Sulfuric acid leaching: soak copper cadmium slag in sulfuric acid at 95°C. The acidity of sulfuric acid is 10g / L. After filtration, the leachate is obtained. The components of the leachate are: Cd 26.71 g / L, Zn 187.58 g / L, Fe 2.26g / L, Cu 0.12g / L, Sn 0.011g / L, Pb 0.084g / L, As 0.059g / L, Sb 0.011g / L, pH=2.8.

[0071] (2) Purify and remove copper: heat the leaching solution in step (1) to 55°C, add 612g of fresh cadmium sponge (2.0 times the theoretical consumption) under stirring; check the pH of the solution during the addition process, when the pH is low, Appropriately add fresh cadmium cotton, control the end point pH=3.4, and obtain the copper removal solution after filtration.

[0072] (3) Oxidative iron removal: heat up the copper removal solution in step (2) to 60°C, add 56L hydrogen peroxide (1.5 times the theoretical consumption) under stirring, take a sample after 20 minutes of reaction time to test As and Sb, and filter it after passing the test. Iron remov...

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Abstract

The invention provides a method for recovering cadmium from copper cadmium residues. The method comprises the following steps: A, carrying out leaching by using sulfuric acid: the copper cadmium residues are leached by using sulfuric acid, and a filtering treatment is performed to obtain a leachate; B, carrying out purifying to remove copper: fresh cadmium sponge is added to the leachate from the step A to replace the copper in the leachate, and a filtering treatment is performed to obtain a copper-removed solution; C, carrying out oxidizing to remove iron: hydrogen peroxide is added to the copper-removed solution from the step B, and a filtering treatment is performed to obtain an iron-removed liquid; D, carrying out zinc powder replacement: sulfuric acid is added to the iron-removed liquid from the step C, zinc powder is added under a stirring state, treatments of filtering and washing are performed to obtain the sponge cadmium, and then a refining treatment is performed to obtain the cadmium ingot. The method of the present invention has the following advantages that: the process is simplified, the cadmium recovery rate is high, the zinc powder consumption is reduced, and no pollution is generated to the environment.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a method for recovering cadmium from copper-cadmium slag. Background technique [0002] In the zinc hydrometallurgy process, zinc sulfate solution is purified to produce copper cadmium slag, which is one of the main raw materials for extracting cadmium. At present, the traditional process of recovering cadmium in copper cadmium slag is generally: sulfuric acid leaching of copper cadmium slag—zinc powder replacement—stacking oxidation—sulfuric acid leaching—purification and copper removal—zinc powder replacement—refining, and finally cadmium ingots are obtained. The traditional process for recovering cadmium requires 2 tons of zinc powder to recover 1 ton of cadmium ingot, that is, the consumption of zinc powder is relatively large. In this traditional process, two-stage leaching is adopted, which is complicated and easily causes cadmium to disperse, reducing ...

Claims

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Application Information

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IPC IPC(8): C22B17/00C22B7/04C22B3/08C22B3/46C22B3/44
CPCY02P10/20
Inventor 廖贻鹏朱北平林文军刘一宁周彦周智
Owner ZHUZHOU SMELTER GRP
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