A method for obtaining high-purity tellurium from arsenic-containing alkali immersion solution

A high-purity tellurium and immersion technology, which is applied in the field of obtaining high-purity tellurium, can solve the problems of low tellurium recovery rate and complex technological process, achieve a wide range of raw material adaptation, high resource utilization rate, and realize resource utilization and harmlessness. Effect

Active Publication Date: 2018-10-16
CENT SOUTH UNIV
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Problems solved by technology

[0005] In order to solve the problems of low tellurium recovery rate and complex process flow in the tellurium-containing alkali leaching solution, the present invention proposes a method for obtaining high-purity tellurium from the arsenic-containing alkali leaching solution, comprising the following steps:

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  • A method for obtaining high-purity tellurium from arsenic-containing alkali immersion solution

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Embodiment 1

[0038] Taking the alkaline immersion solution in the experiment as an example, the concentration of main elements in it is Pb 706.67ppm, Sn 29.02ppm, Te134.56ppm, As 28.29g / L, and the following steps are used for treatment:

[0039] (1) Neutralization: Add H 2 SO 4 Adjust the pH of the alkaline immersion solution to 5, and separate the liquid and solid to obtain neutralization liquid and neutralization slag; the obtained neutralization slag enters the subsequent hydrogen reduction process;

[0040] (2) Selective reduction: the neutralized liquid obtained in step (1) enters the selective reduction process, and SO is introduced into the neutralized liquid 2 , the control conditions are that the gas flow rate is 2L / min, the temperature is 60°C, and the aeration time is 2h. Obtain sodium arsenite solution and reduction slag after reduction finishes;

[0041] After testing: the content of each element in the reducing solution is: Pb 2.86ppm, Sn 0.79ppm, Te 1.08ppm, As27.01g / L. ...

Embodiment 2

[0044] Take the alkaline immersion solution in the experiment as an example, in which the main element concentrations are Pb 647.26ppm, Sn 68.59ppm, Te238.45ppm, As 38.46g / L, and the following steps are used for treatment:

[0045] (1) Neutralization: Add H 2 SO 4 Adjust the pH of the alkaline immersion solution to 4, and separate the liquid and solid to obtain neutralization liquid and neutralization slag; the obtained neutralization slag enters the subsequent hydrogen reduction process;

[0046] (2) Selective reduction: the neutralization solution obtained in step (1) enters the reduction process, and SO is introduced into the neutralization solution 2 , the control conditions are that the gas flow rate is 3L / min, the temperature is 90°C, and the aeration time is 3h. Obtain sodium arsenite solution and reduction slag after reduction finishes;

[0047] After testing: the content of each element in the reducing solution is: Pb 2.43ppm, Sn 0.98ppm, Te 1.45ppm, As37.89g / L. T...

Embodiment 3

[0050] Taking the alkaline immersion solution in the experiment as an example, the concentration of the main elements in it is Pb 547.85ppm, Sn 67.43ppm, Te164.27ppm, As 19.44g / L, and the following steps are used for treatment:

[0051] (1) Neutralization: Add H 2 SO 4 Adjust the pH of the alkaline immersion solution to 5, and separate the liquid and solid to obtain neutralization liquid and neutralization slag; the obtained neutralization slag enters the subsequent hydrogen reduction process;

[0052] (2) Selective reduction: the neutralized liquid obtained in step (1) enters the reduction process, and the neutralized slag enters the hydrogen reduction process. Introduce SO into the neutralizing solution 2 , the control conditions are that the gas flow rate is 5L / min, the temperature is 70°C, and the aeration time is 0.5h. Obtain sodium arsenite solution and reduction slag after reduction finishes;

[0053] After testing: the content of each element in the reducing soluti...

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Abstract

The invention relates to alkaline leaching liquid containing arsenic, tellurium, lead and tin, in particular to a method for obtaining high-purity tellurium from arsenic-containing alkaline leaching liquid. The alkaline leaching liquid is leaching liquid obtained after oxygen pressure alkaline leaching treatment of high arsenic and antimony smoke. The alkaline leaching liquid is neutralized through sulfuric acid, neutralization solution selective reducing is conducted, and the liquid obtained after reducing is a pure sodium arsenite solution and is used as a raw material for purification and removal of cobalt and nickel through zinc sulfate solution arsenic salt; and reducing slag and neutralizing slag are subjected to hydrogen reducing and vacuum distillation, and high-purity tellurium with the purity being 99.999% or above is obtained. According to the method, the tellurium is recycled from the high-tellurium solution, and the pure sodium arsenite solution is obtained and used as the raw material for purification and removal of cobalt and nickel through the zinc hydrometallurgy zinc sulfate solution arsenic salt. According to the method, the technology process is short, the recycling rate is high, and the problem of pollution in the extraction process in the traditional technology is solved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for obtaining high-purity tellurium from an arsenic-containing alkali immersion solution. 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 not o...

Claims

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Application Information

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