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Method for controlling cadmium precipitation through zinc powder replacement through potential

A potential control and zinc powder replacement technology, which is applied in the field of zinc smelting, can solve the problems of low cadmium content in sponge, low utilization rate of zinc powder, and high unit consumption of zinc powder, so as to increase cadmium content, avoid excessive addition of zinc powder, and reduce The effect of single consumption

Inactive Publication Date: 2019-03-12
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

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for potential-controlled zinc powder replacement of deposited cadmium, aiming to solve the problem of high unit consumption of zinc powder, low utilization rate of zinc powder, high production cost, and sponge cadmium in the existing process. Low cadmium content and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] For the solution before the replacement, the potential is used to control the amount of zinc powder added in the replacement process, and the sponge cadmium and the solution after the first replacement are obtained;

[0033] For the solution after the first replacement, the potential is used to control the amount of zinc powder added in the replacement process, and the secondary replacement slag and cadmium-poor solution are obtained;

[0034] The primary replacement temperature is 60°C, adjust the pH to 2.5, add zinc powder evenly and slowly, control the reaction terminal potential to 780mv, stop stirring after the terminal potential remains unchanged for 10 minutes, and put it into the tank after standing for 3 minutes to obtain sponge cadmium and primary replacement liquid.

[0035] The temperature of the secondary replacement process is 55°C, adjust the pH to 2.5, add zinc powder evenly and slowly, control the reaction terminal potential to 930mv, stop stirring after...

Embodiment 2

[0038] For the solution before the replacement, the potential is used to control the amount of zinc powder added in the replacement process, and the sponge cadmium and the solution after the first replacement are obtained;

[0039] For the solution after the first replacement, the potential is used to control the amount of zinc powder added in the replacement process, and the secondary replacement slag and cadmium-poor solution are obtained;

[0040] The primary replacement temperature is 60°C, adjust the pH to 2.5, add zinc powder evenly and slowly, control the reaction terminal potential to 750mv, stop stirring after the terminal potential remains unchanged for 10 minutes, and put it in the tank after standing for 3 minutes to obtain sponge cadmium and primary replacement liquid.

[0041] The temperature of the secondary replacement process is 55°C, adjust the pH to 2.5, add zinc powder evenly and slowly, control the reaction terminal potential to 939mv, stop stirring after t...

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Abstract

The invention discloses a method for controlling cadmium precipitation through zinc powder replacement through potential. The method comprises the following steps that A, copper and cadmium slag is subjected to acid leaching, and a replacement pre-liquid is obtained; B, zinc powder is added to the replacement pre-liquid for primary replacement, and sponge cadmium and a primary replacement post-liquid are obtained; the zinc powder addition amount in the primary replacement process is controlled by the aid of potential; C, the zinc powder is added to the primary replacement post-liquid for secondary replacement, and secondary replacement slag and a lean cadmium liquid are obtained; and the zinc powder addition amount in the secondary replacement process is controlled by the aid of potential.According to the method, the process of cadmium precipitation through zinc powder replacement is controlled through the potential, the electrochemical principle is sufficiently utilized, and the replacement reaction endpoint is controlled according to the standard electrode potential of metal, so that the unit consumption of the zinc powder is effectively reduced, the content of the sponge cadmium is increased, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of zinc smelting, in particular to a method for substituting deposited cadmium with zinc powder by potential control. Background technique [0002] The cadmium in the roasted ore and zinc enter the leaching solution during the purification process of zinc hydrosmelting. After the purification process, the cadmium in the solution is enriched in the form of copper cadmium slag as an intermediate product of zinc hydrosmelting, containing 5%~ About 20%. Usually, after the copper-cadmium slag is leached by acid, the cadmium is leached into the solution, and the copper remains in the leaching residue. For the high-cadmium solution after the copper-cadmium slag is leached, the sponge cadmium is generally extracted by zinc powder replacement. The sponge cadmium replacement process of a domestic zinc factory adopts the secondary replacement process of zinc powder. First, the concentration of cadmium in the liquid before the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B17/00C22B3/46
CPCC22B3/46C22B17/04Y02P10/20
Inventor 李国峰曾鹏陈国木邱伟佳王娜周中华盛俊刘迅吴海艳张少博王秋银姜艳
Owner 云南云铜锌业股份有限公司
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