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Method for recovering copper and cobalt from copper furnace slag

A technology for recovering copper and slag, applied in the field of metallurgy, can solve the problems of high cost and large consumption of sulfuric acid, and achieve the effect of low recovery cost and reduction of sulfuric acid consumption

Inactive Publication Date: 2018-07-17
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that a large amount of sulfuric acid needs to be consumed, and a large amount of alkali is needed to remove iron in the solution, so the cost is high

Method used

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  • Method for recovering copper and cobalt from copper furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 200g of copper slag and grind it to -200 mesh, make a slurry according to the liquid-solid ratio of 3:1, then add 110g of sulfuric acid to it, stir and leaching at 80°C and normal pressure for 4 hours to perform pre-soaking.

[0042] Put the pre-impregnated slurry into the autoclave, the liquid-solid ratio is 6:1 (L / kg), the volume of the stock solution is 1200ml, after sealing, continue to feed oxygen into it, start stirring and heating, and the stirring speed is 800 rpm After heating up to 180°C with a total pressure of 1.2MPa (where the oxygen partial pressure is 0.3MPa), the temperature is maintained for 1.5 hours.

[0043] After the oxygen pressure leaching is completed, the temperature and pressure are lowered, and then the slurry is taken out from the autoclave, filtered and washed with a Buchner funnel to obtain the leaching solution, washing water and leaching residue, and then recover copper and cobalt from the leaching solution, and finally measure the le...

Embodiment 2

[0045] Take 200g of copper slag and grind it to -320 mesh, make a slurry according to the liquid-solid ratio of 4:1, then add 110g of sulfuric acid to it, stir and leaching at 80°C and normal pressure for 1 hour, and perform pre-soaking.

[0046] Put the pre-impregnated slurry into the autoclave, the liquid-solid ratio is 5:1, and the volume of the stock solution is 1000ml. After sealing, continue to feed oxygen into it, start stirring and start heating. The stirring speed is 800 rpm, and the temperature is raised to After 190°C and a total pressure of 1.46MPa (of which the partial pressure of oxygen is 0.3MPa), it is maintained for 1.5 hours.

[0047] After the oxygen pressure leaching is completed, the temperature and pressure are lowered, and then the slurry is taken out from the autoclave, filtered and washed with a Buchner funnel to obtain the leaching solution, washing water and leaching residue, and then copper and cobalt are recovered from the leaching solution, and fin...

Embodiment 3

[0049] Take 200g of copper slag and grind it to -320 mesh, make a slurry according to the liquid-solid ratio of 3.3:1, then add 110g of sulfuric acid to it, stir and leaching at 80°C and normal pressure for 1.5 hours, and perform pre-soaking.

[0050] Put the pre-impregnated slurry into the autoclave, the liquid-solid ratio is 5:1, and the volume of the stock solution is 1000ml. After sealing, oxygen is continuously introduced into it, stirring is started and heating is started. The stirring speed is 800 rpm, and the temperature is raised to After 230° C. and a total pressure of 3.1 MPa (of which the partial pressure of oxygen is 0.4 MPa), it is maintained for 1 hour.

[0051] After the oxygen pressure leaching is completed, the temperature and pressure are lowered, and then the slurry is taken out from the autoclave, filtered and washed with a Buchner funnel to obtain the leaching solution, washing water and leaching residue, and then copper and cobalt are recovered from the l...

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Abstract

The invention provides a method for recovering copper and cobalt from copper furnace slag. The method comprises the following steps: after the copper furnace slag is finely grinded, water is added toprepare pulp; sulfuric acid is added in the pulp for stirring and preimpregnation; the preimpregnated pulp is added in a high-pressure kettle, and oxygen is introduced in the high-pressure kettle forheating, stirring and oxygen pressure leaching; and the pulp after oxygen pressure leaching is taken out from the high-pressure kettle for filtration and washing to obtain leaching liquid, washing water and leaching slag. The method consumes metal iron in the copper furnace slag beforehand through preimpregnation to prevent the explosion risk caused by excessive hydrogen generated in the high-pressure reaction kettle; and meanwhile, most iron is remained in a slag phase in a form of ferric oxide in the oxygen pressure leaching process without entering solution in a form of iron sulfate, so that the use level of sulfuric acid is greatly reduced, the recovery cost is low, and the method can be widely applied to the field of recovery of the copper furnace slag.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for recovering copper and cobalt from copper slag. Background technique [0002] The slag obtained by reduction smelting of copper-cobalt oxide ore contains high copper and a small amount of cobalt, and its basic components are silicon, calcium and iron slag. Usually the slag obtained by pyrometallurgy is waste, and its treatment method is stockpiling or backfilling. [0003] At present, there are few reports on methods for recovering copper from copper-containing slag. A known treatment method is to dissolve the slag with sulfuric acid under normal pressure. The dissolution rate of copper can reach 90-95%, and the dissolution rate of cobalt can reach more than 80%. However, a large amount of iron in the slag is also dissolved. Its dissolution rate reaches more than 85%. The disadvantage of this method is that a large amount of sulfuric acid needs to be consumed, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B23/00
CPCC22B7/007C22B7/04C22B15/0071C22B23/043Y02P10/20
Inventor 王魁珽殷书岩陆业大彭建华韩连敬张文和嘉荣刘国
Owner CHINA ENFI ENGINEERING CORPORATION
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