Method for preparing selenium

A selenium solution and leaching technology, applied in the field of selenium production, can solve the problems of lack of effective and reasonable recovery, no special treatment, waste of resources, etc., and achieve high selenium leaching rate, improve recycling rate, and avoid waste.

Inactive Publication Date: 2015-03-25
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the depletion of resources, coupled with the scarcity of selenium and the lack of effective and reasonable recovery, resulting in a lot of waste of selenium resources
[0003] During the process of pyrometallurgy, especially the treatment of anode slime, a kind of selenium-containing smoke will be produced. There is often no special treatment in the production process, and it is usually returned directly as an ingredient. The selenium in it will inevitably undergo a certain amount of production through multiple processes. losses, resulting in waste of resources and economic losses

Method used

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  • Method for preparing selenium

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Embodiment 1

[0023] see figure 1 , which is a process flow chart for preparing selenium in an embodiment of the present invention. As an embodiment of the present invention, the method for preparing selenium includes the following steps.

[0024] (1), take by weighing 500g dry selenium-containing lead smelting flue dust, adopt hydrochloric acid to dissolve and leach this selenium-containing lead smelting flue dust, the liquid-solid ratio of hydrochloric acid and selenium-containing lead smelting flue dust is 3:1g / g, the pH value of hydrochloric acid solution 4 to 5. Wherein, the selenium-containing lead smelting dust contains selenium (Se): 6.12%, silver (Ag): 4.86%, lead (Pb): 36.91% (by mass fraction). In this embodiment, the controlled dissolution and leaching temperature is 50° C., and the leaching time is 1.5 hours. Preferably, the hydrochloric acid solution is stirred at a constant speed during the dissolution and leaching process, and the stirring speed may be 60 r / min. In this ...

Embodiment 2

[0034] see figure 1 , which is a process flow chart for preparing selenium in an embodiment of the present invention. As an embodiment of the present invention, the method for preparing selenium includes the following steps.

[0035] (1), take by weighing 1000g dry selenium-containing lead smelting dust, adopt hydrochloric acid to dissolve and leach this selenium-containing lead smelting dust, the liquid-solid ratio of hydrochloric acid and selenium-containing lead smelting dust is 4:1g / g, the pH value of hydrochloric acid solution 5 to 6. Wherein, the selenium-containing lead smelting dust contains selenium (Se): 5.83%, silver (Ag): 5.17%, lead (Pb): 38.34% (by mass fraction). In this embodiment, the controlled dissolution and leaching temperature is 60° C., and the leaching time is 2 hours. Preferably, the hydrochloric acid solution is stirred at a constant speed during the dissolution and leaching process, and the stirring speed may be 50 r / min. In this step, selenium o...

Embodiment 3

[0045] see figure 1 , which is a process flow chart for preparing selenium in an embodiment of the present invention. As an embodiment of the present invention, the method for preparing selenium includes the following steps.

[0046] (1), take by weighing 800g dry selenium-containing lead smelting flue dust, adopt hydrochloric acid to dissolve and leach this selenium-containing lead smelting flue dust, the liquid-solid ratio of hydrochloric acid and selenium-containing lead smelting flue dust is 3.5:1g / g, the pH value of hydrochloric acid solution 4 to 5. Wherein, the selenium-containing lead smelting dust contains selenium (Se): 6.08%, silver (Ag): 5.56%, lead (Pb): 37.47% (by mass fraction). In this embodiment, the controlled dissolution and leaching temperature is 58° C., and the leaching time is 1.5 hours. Preferably, the hydrochloric acid solution is stirred at a constant speed during the dissolution and leaching process, and the stirring speed may be 75 r / min. In thi...

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Abstract

The invention discloses a method for preparing selenium. The method comprises the following steps: (1) dissolving and leaching selenium-containing lead smelting smoke by adopting hydrochloric acid, and then filtering to obtain leached filter residues and a selenium-containing liquid; and (2) adding sodium sulfite to the selenium-containing liquid for oxidation-reduction reaction, separating to obtain a selenium-containing solid after the oxidation-reduction reaction is finished, then washing by using water, and drying to obtain a selenium product. The method disclosed by the invention has the advantages of high adaptability on a raw material, simple process, easiness for operation, high selenium leaching rate and less pollution, and can be used for enhancing the recycling rate of the selenium prepared from the lead smelting smoke, thus preventing the selenium resource waste.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a method for preparing selenium. Background technique [0002] Selenium belongs to scattered metals and is widely used in metallurgical industry, national defense industry, electronic industry and agriculture and other fields. Currently. With the depletion of resources, coupled with the scarcity of selenium and the lack of effective and reasonable recovery, resulting in a lot of waste of selenium resources. [0003] During the process of pyrometallurgy, especially the treatment of anode slime, a kind of selenium-containing smoke will be produced. There is often no special treatment in the production process, and it is usually returned directly as an ingredient. The selenium in it will inevitably undergo a certain amount of production through multiple processes. loss, resulting in resource waste and economic loss. Contents of the invention [0004] In view of this, the...

Claims

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Application Information

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IPC IPC(8): C01B19/02
CPCC01B19/02
Inventor 粟明辉黄海飞柴承平蒋朝金
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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