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Method for reducing hexavalent selenium into tetravalent selenium

A hexavalent, selenium solution technology, applied in chemical instruments and methods, selenium/tellurium compounds, selenium/tellurium oxysalts, etc., can solve the problems of long process, unsuitable for large-scale industrial application, etc. Simple restoration method and low cost effect

Pending Publication Date: 2021-12-03
广东先导稀贵金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it can realize the reduction of hexavalent selenium, the process of this method is relatively lengthy and is not suitable for large-scale industrial application

Method used

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  • Method for reducing hexavalent selenium into tetravalent selenium
  • Method for reducing hexavalent selenium into tetravalent selenium
  • Method for reducing hexavalent selenium into tetravalent selenium

Examples

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Embodiment 1

[0023] In this embodiment, the method for reducing hexavalent selenium to tetravalent selenium comprises the following steps:

[0024] (1) 400mL of sodium selenate solution with a concentration of 290g / L was added to the reactor, and the temperature was raised to 70-90°C;

[0025] (2) Slowly add 400mL of hydrochloric acid until the potential of the solution system is 1100mv, stop adding hydrochloric acid, continue to stir the reaction until the potential is 960mv, stop the reaction, and detect the content of tetravalent selenium.

Embodiment 2

[0027] In this embodiment, the method for reducing hexavalent selenium to tetravalent selenium comprises the following steps:

[0028] (1) 400mL of sodium selenate solution with a concentration of 290g / L was added to the reactor, and the temperature was raised to 70-90°C;

[0029] (2) Slowly add 400mL of hydrochloric acid, stir continuously during the addition process, until the reaction reaches a potential of 960mv, stop the reaction, and detect the content of tetravalent selenium.

Embodiment 3

[0031] In this embodiment, the method for reducing hexavalent selenium to tetravalent selenium comprises the following steps:

[0032] (1) 400mL of sodium selenate solution with a concentration of 290g / L was added to the reactor, and the temperature was raised to 70-90°C;

[0033] (2) Slowly add 430mL of hydrochloric acid until the potential of the solution system is 970mv, stop adding hydrochloric acid, continue to stir the reaction until the potential is 900mv, stop the reaction, and detect the content of tetravalent selenium.

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Abstract

The invention provides a method for reducing hexavalent selenium into tetravalent selenium, and relates to the technical field of chemical recovery. The method for reducing hexavalent selenium into tetravalent selenium comprises the following steps: dissolving a hexavalent selenium compound in water to form a hexavalent selenium solution, and heating the hexavalent selenium solution to 70-90 DEG C; and adding hydrochloric acid into the hexavalent selenium solution, performing stirring and reaction until the potential value of the solution is 900-960mv, and stopping the reaction. According to the method, the solution system reaches the reduction potential of selenium by utilizing the reducibility of hydrochloric acid, so that hexavalent selenium which is difficult to be reduced into elementary substance by a conventional reducing agent (such as sodium sulfite) is reduced into tetravalent selenium which is easy to be reduced into elementary substance, and the selenium can be effectively recovered into elementary substance.

Description

technical field [0001] The invention relates to the technical field of chemical recovery, in particular to a method for reducing hexavalent selenium to tetravalent selenium. Background technique [0002] Selenium is a scattered metal and is the raw material for the production of selenium compounds. Selenium compounds are widely used as decolorizers for glass, colorants, and feed additives. In addition, selenium also has important applications in the fields of electronics and solar energy, and has high value. In the production and recycling process of selenium, it is often necessary to add an oxidizing agent. When the selenium in the solution is oxidized to hexavalent, it is difficult to be reduced and precipitated in the subsequent reduction process. The tetravalent selenium reduced by the reducing agent is of great significance for the recovery of selenium and the utilization of resources. [0003] Chinese patent CN108558086A discloses a combined process for removing hexa...

Claims

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Application Information

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IPC IPC(8): C01B19/00
CPCC01B19/008
Inventor 梁鉴华王波陈应红刘威陈秋旭梅占强叶道明
Owner 广东先导稀贵金属材料有限公司
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