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A method for recovering cu, cd, ni, co, zn from copper cadmium slag

A kind of technology of copper cadmium slag and sponge cadmium

Active Publication Date: 2017-10-13
六盘水中联工贸实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the sponge cadmium in the copper cadmium slag mainly exists in the form of sulfate, which is rarely evaporated, it cannot be separated.
Even the sponge cadmium replaced by fresh sponge cadmium slag and zinc powder is easily oxidized or sulfated

Method used

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  • A method for recovering cu, cd, ni, co, zn from copper cadmium slag

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Embodiment

[0029] Step 1, with H ２ SO 4 At 80~90℃, manganese ore powder 10% or H 2 o 2 5%, liquid / solid=3~4, leaching copper cadmium slag containing 0.57% Cu, 2.32% Cd, 0.19% Ni, 0.044% Co, 45.7% Zn. The leaching time is 2 hours; the pH value of the leaching end point is 2~3. Filter to obtain the leaching solution containing Cu 882mg / L, Cd6955mg / L, Ni366mg / L, Co140mg / L, Zn132g / L, and filter residue with 50g / L H ２ SO 4 , manganese ore powder 5%, at 80~90℃, liquid / solid=3 for the second leaching, the filtrate returns to the first leaching, the average filter residue rate is 6~7%, Cu0.039%, Cd0.19%, Ni0 .0053%, Co0.0023%, Zn4.1%.

[0030] Step 2, use the primary acid leaching solution of step 1 to extract Cu by Cp180, compared with / water=1.5~2, Cp180 30~40%, kerosene 60~70%, three-stage extraction, two-stage 250g / L H ２ SO 4 Stripping, primary 5%NH 4 HCO 3Wash and regenerate. The raffinate contains Cu3mg / L, and the extraction rate is 99.6%. The back extraction liquid contains Cu ...

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Abstract

The invention provides a method for recovering Cu, Cd, Ni, Co and Zn from copper-cadmium slag. The copper-cadmium slag is subjected to two times of oxidizing acid leaching, and Cu is extracted from leach liquor; after Fe in raffinate is removed through neutralization oxidation, Ni and Co are precipitated through cobalt purification reagents, and Co and Ni concentrate is obtained through calcinations; after liquor obtained after Co precipitation is subjected to activated carbon adsorption, an electrolytic metal zinc plate is used for replacing spongy cadmium, and a metal cadmium ingot is obtained through melting; and liquor after replacement is delivered to a zinc electrolyzing system. H2SO4 leaching is adopted during the two times of oxidizing acid leaching, and the final PH value after the first time of oxidizing acid leaching is 2 to 3; in the second time of oxidizing acid leaching, the concentration is 50-100 g / L, time is 2 hours, and an oxidizing agent is MnO2 of 5-10% or H2O2 of 5-10%; extraction agents of copper are Cp180 of 20-40% and kerosene of 60-80%, the extraction PH value is 2 to 3, the concentration of reverse extraction H2SO4 is 250-300 g / L, and three levels of extraction, two levels of reverse extraction and two levels of regeneration from washing are carried out; the amount of the cobalt purification reagents is 1.2-1.4 times the sum of the content of Co and the content of Ni, and the temperature ranges from 50 DEG C to 60 DEG C; the replacement PH value of the spongy cadmium is 3 to 4, and the temperature ranges from 40 DEG C to 50 DEG C. According to the method, the process is short, and the recovery rate is high.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for recovering Cu, Cd, Ni, Co and Zn from copper-cadmium slag. Background technique [0002] The copper cadmium slag produced by hydrometallurgy generally contains more than 0.5% Cu, more than 2% Cd, more than 0.2% Ni, more than 0.03% Co, and more than 40% Zn. With the extension of time, Cu, Cd, Ni, Co, and Zn mainly exist in the form of oxidation state and sulfate, which are easy to be absorbed by H ２ SO 4 leaching. The traditional process is to firstly carry out neutral leaching pH5.2~5.4, first leaching Zn, Cd, and then carrying out acid leaching Cu, Co, Ni, but practice has proved that a considerable part of Cu, Co, Ni is leaching, and the acid leaching stage Zn and Cd are also relatively high, which cannot meet the requirements of selective leaching. Therefore, when zinc powder is used to replace Cd in the immersion solution, Cu, Co, and Ni are also rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B15/00C22B23/00C22B19/30C22B17/00C25C1/16
CPCY02P10/20
Inventor 李世平钟波兰天阳赵钟爱张彬
Owner 六盘水中联工贸实业有限公司
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