Method for extracting metal indium from waste residues generated from lead and zinc smelting

A technology for extracting metal and waste slag, which is applied in the field of metallurgy, can solve the problems of low extraction rate of indium, short extraction rate process flow, long process flow, etc., and achieve low leaching temperature, which is beneficial to environmental protection and short process flow.

Inactive Publication Date: 2010-03-03
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +2
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Problems solved by technology

[0009] Aiming at the problems of low extraction rate of indium and long process flow in the prior art, the present invention provides a method for extracting metal indium from waste slag after lead-zinc smelting with high extraction rate and relatively short process flow

Method used

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Embodiment Construction

[0025] The raw material for extracting indium—lead-zinc smelting waste residue was provided by Qinghai Western Indium Industry Co., Ltd. The analysis results of its main chemical components: Zn: 20-40%; In: 0.05-0.15%.

[0026] (1) Pickling once

[0027] Use 120g / L sulfuric acid solution to leach lead-zinc smelting waste residue, and control the solid-liquid ratio at 1:4, so that the pH of the slurry is around 4.5. Adjust the leaching temperature to 70°C, and leaching for 1.5 hours under stirring.

[0028] After one acid leaching, the analysis results of the main chemical components of the liquid phase obtained by pressure filtration: Zn: 100-150g / L; Fe: 30-40g / L. After removing impurities from the liquid phase, it is concentrated and dried to obtain zinc sulfate monohydrate. The chemical analysis results of zinc sulfate are: ZnO: 95-98%, Fe: <0.02%, Cd: <0.0005%.

[0029] The main chemical composition analysis results of the solid phase (a leaching residue) obtained by pre...

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Abstract

The invention provides a method for extracting metal indium from waste residues generated from lead and zinc smelting. The method is implemented by the following steps: carrying out low-temperature and low-acid leaching on the waste residues generated from the lead and zinc smelting, and removing acid-soluble metals from the waste residues; then carrying out high-temperature and high-acid leachingto obtain indium; and obtaining the metal indium after extraction, re-extraction, reduction and refining. The method has relatively short process flow and low production cost, generates a great amount of byproducts, can comprehensively recover and recycle waste water and the waste residues, is not only good for environmental protection, but also realizes cyclic and comprehensive resource use. Thetotal recovery rate of the metal indium is 70-80%, and the recovery rate of high-purity metal indium is up to 99.995%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a process for extracting metal indium, in particular to a method for extracting metal indium from waste slag after lead-zinc smelting. Background technique [0002] Indium is a rare element in the earth's crust. It cannot be independently ore-formed, but is dispersedly distributed in other minerals, most of which exist in sphalerite and galena in a sparse state. When the content of indium reaches 0.002%, it has industrial recycling value. Scattered metal indium is widely used in high-tech fields such as electronic computers, energy, electronics, optoelectronics, aviation, nuclear industry, chemical industry and modern information industry. [0003] The currently applied lead-zinc smelting process will produce a large amount of leached iron slag, lead-indium slag, etc. These waste residues contain a large amount of metals such as Au, Ag, In, crude lead, etc. that have recovery v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/08C22B3/44C22B3/38C25C1/22C22B58/00
CPCY02P10/20
Inventor 贾永忠王小华孟宪党景燕徐跃伟姚颖马军孙进贺马增玲
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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