A method for recovering and preparing high-purity tellurium from arsenic-containing tellurium fumes

A high-purity tellurium and soot technology, which is applied in the field of hydrometallurgy, can solve the problems of low recovery rate of arsenic-containing tellurium soot and complex process flow, etc., and achieve the effects of a wide range of raw materials, pollution problems, and high comprehensive utilization of resources

Active Publication Date: 2017-11-14
CENT SOUTH UNIV
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Problems solved by technology

[0005] In order to solve the problems of low recovery rate of arsenic-containing tellurium dust and complex process flow, the present invention proposes a method for recovering and preparing high-purity tellurium from arsenic-containing tellurium dust, which includes the following steps:

Method used

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  • A method for recovering and preparing high-purity tellurium from arsenic-containing tellurium fumes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 1.57%, As48.56%, Sn0.51%, Sb 21.24%, Zn 0.73%, Te 0.35%, Se 0.25%, and the following steps are adopted To process:

[0043] (1) Oxygen pressure leaching: Weigh a certain quality of high-arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio of 10:1, the NaOH concentration of 3mol / L, the stirring speed of 300r / min, the leaching temperature of 160°C, and the oxygen content Pressure 2Mpa, leaching time 2h, after leaching, remove the slurry, filter and separate to obtain crude sodium antimonate and leaching solution;

[0044] After testing: the arsenic leaching rate is 41.53%, and the concentration of each element in the leach solution is Pb 709.60ppm, Se31.02ppm, Sb8.2ppm, Te 123.28ppm, As 20.17g / L.

[0045] (2) Neutralization: Add H 2 SO 4 Adjusting the pH of the leaching solution obtained in step (1...

Embodiment 2

[0050] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 6.88%, As36.51%, Sn1.11%, Sb 29.77%, Zn 0.54%, Te 0.24%, Se 0.05%, and the following steps are adopted To process:

[0051] (1) Oxygen pressure leaching: Weigh a certain quality of high arsenic and antimony fume in the reaction kettle, according to the liquid-solid volume mass ratio 5:1, NaOH concentration 5mol / L, stirring speed 300r / min, leaching temperature 200℃, oxygen content Pressure 1.5Mpa, leaching time 2.5h, after leaching, remove the slurry, filter and separate to obtain crude sodium pyroantimonate and leaching solution;

[0052] After testing: the arsenic leaching rate is 41.29%. The concentration of each element in the leachate is 515.20ppm Pb, 31.56ppm Se, 9.40ppm Sb, 122.26ppm Te, and 15.07g / L As.

[0053] (2) Neutralization: adding H to the leaching solution at a temperature of 80°C and a stirring speed of 150r / min 2 SO 4 Adjus...

Embodiment 3

[0058] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 5.46%, As 30.29%, Sn 0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, Se 0.07%, and the following steps are used deal with:

[0059] (1) Oxygen pressure leaching: Weigh a certain quality of high-arsenic and antimony fumes in the reaction kettle, according to the liquid-solid volume mass ratio of 15:1, NaOH concentration of 1mol / L, stirring speed of 400r / min, leaching temperature of 180°C, oxygen content Pressure 2Mpa, leaching time 1.5h, after leaching, remove the slurry, filter and separate to obtain crude sodium pyroantimonate and leaching solution;

[0060] After testing: the arsenic leaching rate is 86.95%, and the concentration of each element in the leach solution is Pb 956.35ppm, Se 18.91ppm, Sb9.63ppm, Te 144.92ppm, As 17.56g / L.

[0061] (2) Neutralization: under the condition that the temperature of the leachate is 40°C and the stirring speed is ...

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Abstract

The invention provides a method for recycling high-purity tellurium from arsenium-containing and tellurium-containing smoke and preparing high-purity tellurium, and relates to production for comprehensively recycling valuable elements, such as arsenium, tellurium and lead, from the arsenium-containing and tellurium-containing smoke and harmless recycling processing of the arsenium. Oxygen pressure leaching is conducted on caustic alkali, leaching residues are rough sodium pyroantimonate, leachate is neutralized through sulfuric acid, the neutralized liquid is selectively reduced, the reduced liquid is a pure sodium arsenite solution and is used as a raw material of zinc sulfate solution arsenic salt purification and cobalt and nickel removal, reduction residues and neutralization residues are subjected to hydrogen reduction and vacuum distillation, and the high-purity tellurium with the purity being 99.999% or above is obtained. The arsenium and the tellurium are leached out from the smoke, while stibium, lead, bismuth, tin and the like are reserved in dearsenification residues as much as possible, the pure sodium arsenite solution is obtained through leachate purification and is used as the raw material of zinc sulfate solution arsenic salt purification and cobalt and nickel removal in zinc hydrometallurgy, harmless recycling of the arsennium is achieved, and valuable elements such as the stibium, the lead, the bismuth and the tin are recycled. The method is high in resource utilization rate and wide in raw material application range and solves the problem of pollution in the extraction process of the traditional process.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for recovering and preparing high-purity tellurium from fumes containing arsenic and tellurium. Background technique [0002] Tellurium is widely used in solar cells, optical disk recording, thermoelectric refrigeration, etc., and is increasingly valued and favored by scientific and technological workers at home and abroad. Tellurium is also considered as one of the important supporting materials in the high-tech field in the 21st century. . However, tellurium began to be produced on a large scale in 1942. In recent years, with the rapid development of high-tech industries, the demand for tellurium has increased sharply. Therefore, in the case of limited tellurium reserves, it is of great significance to comprehensively recover metal tellurium from waste. During the smelting and roasting of lead and zinc, the high-arsenic and antimony fumes produced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B30/04C22B13/00C22B30/02C01B19/02
CPCC01B19/02C01P2006/80C22B7/008C22B7/02C22B13/045C22B30/02C22B30/04Y02P10/20
Inventor 刘智勇刘志宏李启厚周亚明李玉虎姚伟
Owner CENT SOUTH UNIV
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