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Method for selectively purifying and removing copper and cadmium by automatic control of electric potential

A selective and potentiometric technology, which is applied in the direction of electrolysis process, electrolysis components, process efficiency improvement, etc., can solve the problems of high unit consumption of zinc powder, lengthy copper and cadmium removal process, etc., so as to reduce the unit consumption of zinc powder and realize production The effect of controlling the level and reducing the production cost

Pending Publication Date: 2020-12-11
云南云铜锌业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for selectively purifying and removing copper and cadmium with automatic potential control, aiming at solving the problems of lengthy process flow and high unit consumption of zinc powder in the existing process for removing copper and cadmium

Method used

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  • Method for selectively purifying and removing copper and cadmium by automatic control of electric potential

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A method for selectively purifying and removing copper and cadmium by potential control, the specific steps are as follows.

[0061] Step 1, heating the middle and supernatant solution of zinc calcined sand containing copper and cadmium through neutral leaching;

[0062] Step 2, adding zinc powder to the supernatant solution described in step 1 according to the change in solution potential, and filtering after the reaction to obtain low-copper-substituted liquid and copper-rich slag;

[0063] Step 3, heating the liquid after the low copper replacement in step 2;

[0064] Step 4: Add zinc powder to the low-copper-substituted solution described in step 3 according to the potential change of the solution, and filter to obtain a section of purified solution and sponge cadmium after the reaction is completed.

[0065] In step 2, at 60°C, add zinc powder to the supernatant solution containing copper and cadmium, replace and remove copper to control the terminal potential of ...

Embodiment 2

[0068] Such as figure 1 Shown, a potential control selective purification method for removing copper and cadmium, the specific steps are as follows.

[0069] Step 1, heating the middle and supernatant solution of zinc calcined sand containing copper and cadmium through neutral leaching;

[0070] Step 2, adding zinc powder to the supernatant solution described in step 1 according to the change in solution potential, and filtering after the reaction to obtain low-copper-substituted liquid and copper-rich slag;

[0071] Step 3, heating the liquid after the low copper replacement in step 2;

[0072] Step 4: Add zinc powder to the low-copper-substituted solution described in step 3 according to the potential change of the solution, and filter to obtain a section of purified solution and sponge cadmium after the reaction is completed.

[0073] In step 2, at 55°C, zinc powder is added to the supernatant solution containing copper and cadmium, wherein, the replacement and removal of...

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Abstract

The invention discloses a method for selectively purifying and removing copper and cadmium by automatic control of electric potential. The method for selectively purifying and removing copper and cadmium by automatic control of electric potential comprises the following steps of providing a solution containing copper ions and cadmium ions; adding zinc powder into the solution containing copper ions and cadmium ions for replacement to remove copper, and carrying out solid-liquid separation to obtain a liquid after replacement to remove copper and copper slag, wherein the adding amount of the zinc powder in a process of replacement to remove copper is controlled by means of electric potential at a reaction endpoint; and adding the zinc powder into the liquid after replacement to remove copper for liquid after replacement to remove cadmium, and carrying out solid-liquid separation to obtain a liquid after replacement to remove cadmium and sponge cadmium, wherein the adding amount of the zinc powder in a process of replacement to remove cadmium is controlled by means of electric potential at a reaction endpoint. The method achieves a purpose of removing impurities precisely by judgingthe replacement reaction endpoints of copper and cadmium impurities in the solution in an electric potential measuring mode and extracting copper and cadmium in the solution in steps, so that a cadmium recovery treatment step is optimized, the unit consumption and the production cost of the zinc powder are reduced, and the production control level is improved and the economical benefit is increased.

Description

technical field [0001] The invention relates to the field of nonferrous metallurgy industry, in particular to a method for selectively purifying and removing copper and cadmium with automatic potential control. Background technique [0002] In the process of zinc hydrometallurgy, the supernatant produced by neutral leaching of zinc calcined sand contains impurity elements such as copper, cadmium, cobalt, nickel, etc. In order to meet the quality requirements of zinc electrowinning solution, the impurity elements in the supernatant must be Deal effectively. [0003] The classic solution purification processes include antimony salt zinc powder purification technology, arsenic salt zinc powder purification technology and xanthate / xanthafine purification technology. The above classic processes are mainly different technical methods for removing cobalt in the supernatant. For the copper and cadmium impurities in the supernatant, in the three-stage antimony salt zinc powder purif...

Claims

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Application Information

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IPC IPC(8): C22B19/20C22B3/46C25C1/16C25C7/06
CPCC22B19/26C22B3/46C25C1/16C25C7/06Y02P10/20
Inventor 姜艳曾鹏陈国木邱伟佳张少博刘建平李国峰陶余彩吴钧刘迅杨全胜
Owner 云南云铜锌业股份有限公司
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