Method for recovering tellurium through cyclone electrolysis of solution containing tellurium

A swirling electrolysis and solution technology, applied in the field of metallurgy, can solve the problems of large influence of cathode tellurium quality and low electrolysis efficiency, and achieve the effects of reducing the concentration of impurity elements, shortening the electrolysis period, and reducing adverse effects

Inactive Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the deficiencies of the prior art, and provide a method for reclaiming tellurium by swirling electrolysis of tellurium-containing solution. The quality of tellurium is more and more affected, and the electrolysis efficiency becomes lower

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  • Method for recovering tellurium through cyclone electrolysis of solution containing tellurium
  • Method for recovering tellurium through cyclone electrolysis of solution containing tellurium
  • Method for recovering tellurium through cyclone electrolysis of solution containing tellurium

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Embodiment 1

[0030] A method for reclaiming tellurium by swirl electrolysis of a tellurium-containing solution of the present invention comprises the following steps:

[0031] (1) Slowly add sulfuric acid with a concentration of 98% into the tellurium-containing solution. When the pH value of the solution is controlled by a pH meter to 5.7, stop adding concentrated sulfuric acid; Filter to obtain tellurium dioxide precipitate;

[0032] (2) the tellurium dioxide precipitation that step (1) is obtained is that the sodium hydroxide solution leaching (the liquid-solid ratio of sodium hydroxide solution and tellurium dioxide precipitation is 5:1 with the concentration of 100g / L, ratio unit is L / Kg), controlling the leaching temperature to be 90°C, and leaching for 6h to obtain a tellurium leaching solution;

[0033] (3) Add 200g / L tellurium leaching solution to the circulating electrolyzer, adjust the circulating flow rate to 400L / h, and the current density to be 100A / m 2 , to carry out swir...

Embodiment 2

[0036] A method for reclaiming tellurium by swirl electrolysis of a tellurium-containing solution of the present invention comprises the following steps:

[0037] (1) Slowly add sulfuric acid with a concentration of 98% into the tellurium-containing solution. When the pH value of the solution is controlled by a pH meter to 6.0, stop adding concentrated sulfuric acid; Filter to obtain tellurium dioxide precipitate;

[0038] (2) the tellurium dioxide precipitate obtained in step (1) is leached with a concentration of 100g / L of sodium hydroxide solution (the liquid-solid ratio of sodium hydroxide solution and tellurium dioxide precipitate is 6:1, and the ratio unit is L / Kg), controlling the leaching temperature to be 80°C, and leaching for 6h to obtain a tellurium leaching solution;

[0039] (3) Add 100g / L tellurium leaching solution to the circulating electrolyzer, adjust the circulating flow rate to 300L / h, and the current density to 80A / m 2 , to carry out swirl electrolysis...

Embodiment 3

[0042] A method for reclaiming tellurium by swirl electrolysis of a tellurium-containing solution of the present invention comprises the following steps:

[0043](1) Slowly add sulfuric acid with a concentration of 98% into the tellurium-containing solution. When the pH value of the solution is controlled by a pH meter to 6.5, stop adding concentrated sulfuric acid; Filter to obtain tellurium dioxide precipitate;

[0044] (2) the tellurium dioxide precipitate obtained by step (1) is leached with a concentration of sodium hydroxide solution of 120g / L (the liquid-solid ratio of sodium hydroxide solution and tellurium dioxide precipitate is 7:1, and the ratio unit is L / Kg), controlling the leaching temperature to be 60° C., and leaching for 6 hours to obtain a tellurium leaching solution;

[0045] (3) Add 10g / L tellurium leaching solution to the circulating electrolyzer, adjust the circulating flow rate to be 100L / h, and the current density to be 50A / m 2 , carry out swirl elec...

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Abstract

The invention discloses a method for recovering tellurium by swirl electrolysis of a tellurium-containing solution, which comprises the following steps: adding concentrated sulfuric acid into the tellurium-containing solution until the pH value of the tellurium-containing solution is 5.7-6.5, controlling the temperature of the tellurium-containing solution to be higher than React at 90°C for 2 to 4 hours, filter; leach the filter residue obtained after filtration with sodium hydroxide solution; perform swirl electrolysis on the leaching solution obtained after leaching, and take out the cathode after swirl electrolysis; The solution is boiled, washed, and dried to obtain high-purity tellurium. The invention adopts swirl electrolysis to recover tellurium in the tellurium-containing solution, which avoids the influence of unfavorable factors on electrowinning such as the decrease of current efficiency and the increase of concentration polarization caused by the slow flow of the solution in the traditional electrolysis process, and shortens the electrolysis cycle of tellurium , which reduces the concentration requirements of impurity elements in the electrolyte, and has many advantages such as high selectivity, high current density, and high product purity.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for recovering tellurium by swirling electrolysis of a solution containing tellurium. Background technique [0002] Tellurium is an important scattered metal. Due to its special physical and chemical properties, it is widely used in many fields such as metallurgy, chemical industry, petroleum, electronics, electrical, glass ceramics, pigments and medicine. High-purity tellurium is the best choice for preparing compound semiconductor materials. Basic materials, with the development of the electronics industry, the demand for high-purity tellurium is increasing day by day. [0003] At present, the main preparation method of high-purity tellurium is the electrolytic refining method. The electrolytic refining method is to dissolve the purified tellurium dioxide in sodium hydroxide solution to prepare an electrolyte. The ordinary steel plate is used as the anode and the stainless st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00
CPCC25B1/00
Inventor 郭学益许志鹏李栋田庆华
Owner CENT SOUTH UNIV
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