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A method for removing copper and cadmium from zinc sulfate leaching solution

A zinc sulfate and leaching solution technology, which is applied in the field of zinc wet purification and impurity removal, can solve the problems of complex treatment process, low copper slag grade, and high cost, and achieve the effects of simple process operation, short process flow, and low cost

Active Publication Date: 2019-04-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods have the following defects: the two-stage leaching method has a long process, slow reaction speed (1 to 2 days), large consumption of manganese dioxide, low copper slag grade, and high impurities in the leachate; the leachate of the direct leaching method contains impurities High, and copper is also leached into the solution, it needs to consume a lot of zinc powder to replace the sponge copper
Therefore, the copper cadmium slag produced by the traditional process is difficult to separate, and the treatment process is complicated, the process is long, and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for removing copper and cadmium from zinc sulfate leaching solution, specifically comprising the steps:

[0017] (1) Take the middle and supernatant of the zinc hydrometallurgy production system, that is, the zinc sulfate leaching solution. The middle and supernatant is mainly zinc sulfate solution, containing 140g / L of zinc, 1.2g / L of copper, and 0.8g / L of cadmium. L, then under stirring condition, add metal lead powder, the molar ratio of the addition of lead powder and copper in the zinc sulfate leaching solution is 1.5: 1, temperature 30 ℃, react 2h, obtain copper slag and copper-removing liquid after filtering; After copper removal, the solution contains 0.2 mg / L copper;

[0018] (2) Under stirring conditions, add aluminum powder to the solution after copper removal in step (1), the molar ratio of the added amount of aluminum powder to the cadmium in the zinc sulfate leaching solution is 1.5:1, the temperature is 30°C, react for 2 hours, and filter Finall...

Embodiment 2

[0021] A method for removing copper and cadmium from zinc sulfate leaching solution, specifically comprising the steps:

[0022] (1) Take the middle and supernatant of the zinc hydrometallurgy production system, which is the zinc sulfate leaching solution. The middle and supernatant is mainly zinc sulfate solution, containing 150g / L of zinc, 2g / L of copper, and 0.5g / L of cadmium , then under stirring conditions, add metal lead powder, the molar ratio of the amount of lead powder added to the copper in the zinc sulfate leaching solution is 1:1, the temperature is 80 ° C, and the reaction is 0.5h. After filtering, copper slag and copper-removed liquid are obtained; After copper removal, the solution contains 4mg / L of copper;

[0023] (2) Under stirring conditions, add iron powder to the solution after copper removal in step (1), the molar ratio of the amount of iron powder added to the cadmium in the zinc sulfate leaching solution is 1.2:1, the temperature is 80°C, and the react...

Embodiment 3

[0026] A method for removing copper and cadmium from zinc sulfate leaching solution, specifically comprising the steps:

[0027] (1) Take the middle and supernatant of the zinc hydrometallurgy production system, that is, the zinc sulfate leaching solution. The middle and supernatant is mainly zinc sulfate solution, containing 130g / L of zinc, 0.5g / L of copper, and 2g / L of cadmium , then under stirring conditions, add metal lead powder, the molar ratio of the amount of lead powder added to the copper in the zinc sulfate leaching solution is 1.2: 1, the temperature is 40 ° C, react for 1 hour, and obtain copper slag and copper-removed liquid after filtering; Copper solution contains 1mg / L of copper;

[0028] (2) Under the condition of stirring, add iron powder to the liquid after copper removal in step (1), the molar ratio of the amount of iron powder added to the cadmium in the zinc sulfate leaching liquid is 1:1, the temperature is 50°C, react for 1h, filter Finally, high-grad...

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Abstract

The invention discloses a method for removing copper and cadmium from zinc sulfate leachate. A middle supernate of a zinc hydrometallurgy production system is taken out, metal lead powder is added, and copper slag and copper removal liquid is obtained after the metal lead power is replaced and filtered; aluminum powder or iron powder is added into the copper removing liquid and filtered so as to obtain high-grade cadmium-sponge and cadmium-removal liquid. The method is short in technological process and low in reagent cost, and impurity copper and cadmium in a zinc sulfate solution are removedstep by step, copper slag, sponge cadmium, the copper and the cadmium are recycled step by step, and the copper slag is sent to the top blowing furnace system, so that comprehensive recovery is realized.

Description

technical field [0001] The invention relates to a method for removing copper and cadmium from zinc sulfate leaching solution, and belongs to the technical field of zinc wet purification and impurity removal. Background technique [0002] At present, in the purification and impurity removal process of zinc hydrometallurgy, the traditional one-stage purification process for removing copper and cadmium mainly adds zinc powder in an electric furnace to remove copper and cadmium impurities at the same time to obtain copper-cadmium slag and copper-cadmium-removed liquid. This copper-cadmium slag still needs to be subjected to wet treatment to separate copper and cadmium, which has the disadvantages of long process flow and high cost. Zn / Zn 2+ , Cd / Cd 2+ , Cu / Cu 2+ The standard electrode potentials are -0.763, -0.403, 0.337. Zinc replaces copper first, and then replaces cadmium. Therefore, copper is easy to remove, but cadmium is slightly difficult. Improper operation is prone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/46C22B15/00C22B17/00
CPCC22B3/46C22B15/00C22B17/00Y02P10/20
Inventor 张英杰森维董鹏孙红燕李雪王丁李冕
Owner KUNMING UNIV OF SCI & TECH
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