Method for preparing cadmium metal from copper and cadmium slag leachate

A copper-cadmium slag and leaching solution technology, applied in the field of zinc hydrometallurgy, can solve the problems of harsh working environment, long process flow of cadmium recovery, inconvenient transportation, etc. The effect of easy transportation and storage

Active Publication Date: 2014-05-07
BAIYIN NONFERROUS GROUP
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  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for producing highly pure cathode ray tubes with low levels of Cadmium without requiring expensive materials or complicated processes like electroplating. It also reduces waste from disposal after use. By changing the movement direction inside this system, it can be used more efficiently during manufacturing.

Problems solved by technology

Technological Problem: During this process for producing pure metal Cadmiums (Cd) by replacing calcium with cobalt or other metals like lead), there can be issues related to how quickly it works because these materials contain many impurity elements such as sulfur that may affect their performance negatively during subsequent purification steps.

Method used

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  • Method for preparing cadmium metal from copper and cadmium slag leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1 ball milling: 7 t (H 2 O: 38%, Zn: 29%, Cd: 4.5%) enter the wet ball mill, add water for ball milling, and control the liquid-solid volume ratio to 2.5:1;

[0021] Step 2 leaching: pump the ball mill slurry obtained in step 1 into the copper cadmium slag leaching tank to add water, control the liquid-solid ratio to 4:1, simultaneously heat up the ball mill slurry, and slowly add concentrated sulfuric acid, control the reaction temperature to 80°C, control The reaction time is 6 hours, the reaction is until the pH value is 3.0, and the leached ore slurry (Zn: 76.3g / L, Cd: 11.9 g / L, Fe: 1.2 g / L) is obtained;

[0022] Step 3 iron removal: add manganese dioxide 27kg in the leach ore slurry that step 2 obtains, remove the ferrous iron in the leach ore slurry, the reaction times 0.5h, the ferrous iron content in the leach ore slurry is 46mg / L, to Add ball mill slurry to the leached ore slurry, adjust the pH to 4.5, continue to react for 0.5h until the total iron conte...

Embodiment 2

[0027] Step 1 Ball milling: 7.5 t (H 2 O: 40%, Zn: 31%, Cd: 5%) enter the wet ball mill, add water for ball milling, and control the liquid-solid volume ratio to 3.0:1;

[0028] Step 2 leaching: pump the ball mill slurry obtained in step 1 into the copper cadmium slag leaching tank to add water, control the liquid-solid ratio to 4.5:1, simultaneously heat up the ball mill slurry, and slowly add concentrated sulfuric acid, control the reaction temperature to 83°C, control The reaction time was 7 hours, and the reaction was carried out until the pH value was 3.2 to obtain a leach slurry (Zn: 83.7 g / L, Cd: 13.5 g / L, Fe: 1.5 g / L);

[0029] Step 3 iron removal: add manganese dioxide 36kg in the leach ore slurry obtained in step 2, remove the ferrous iron in the leach ore slurry, the reaction time is 0.8h, the ferrous iron content in the leach ore slurry is 40mg / L, to Add ball mill pulp to the leach slurry, adjust the pH to 4.8, continue to react for 0.5h until the total iron conte...

Embodiment 3

[0034] Step 1 Ball milling: 7.8 t (H 2 O: 42%, Zn: 30%, Cd: 4%) enter the wet ball mill, add water for ball milling, and control the liquid-solid volume ratio to 3.5:1;

[0035] Step 2 leaching: pump the ball mill slurry obtained in step 1 into the copper cadmium slag leaching tank to add water, control the liquid-solid ratio to 5:1, simultaneously raise the temperature of the ball mill slurry, and slowly add concentrated sulfuric acid, control the reaction temperature to 85°C, control The reaction time was 8 hours, and the reaction was carried out until the pH value was 3.5 to obtain leached ore slurry (Zn: 73.2g / L, Cd: 9.9g / l, Fe: 1.6 g / L);

[0036] Step 3 iron removal: add manganese dioxide 39kg in the leach ore slurry that step 2 obtains, remove the ferrous iron in the leach ore slurry, the reaction time 1.0h, the ferrous iron content in the leach ore slurry is 38mg / L, to Add ball mill pulp to the leached ore slurry, adjust the pH to 5.0, continue to react for 0.5h until ...

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Abstract

The invention aims to provide a method for preparing cadmium metal from a copper and cadmium slag leachate, solving the problems of short process flow of recovering cadmium from the copper and cadmium slag leachate, poor work environment and inconvenience in transportation in the prior art. The cadmium metal is prepared through ball-milling, leaching, deironing, filter-pressing and cooling so that the strip-shaped cadmium metal is obtained. According to the method, the cadmium preparing flow is shortened, and the strip-shaped cadmium metal with high grade of more than 95 percent is produced, so that cadmium ions in the copper slag leachate are separated out in a strip-shaped cadmium metal form, the convenience is brought for transportation and storage; the labor intensity of employees and the environment pollution are reduced, and better economic and social benefits and popularization values are achieved.

Description

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Claims

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Application Information

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Owner BAIYIN NONFERROUS GROUP
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