Method for extracting selenium from mercury-selenium acid mud waste

A technology for selenium acid sludge and waste, which is applied in the field of selenium extraction, can solve the problems of difficult extraction, complex production process, low recovery rate, etc., and achieves the effect of easy operation and simple equipment requirements.

Inactive Publication Date: 2015-08-12
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method must strictly control the amount of lime added. When there is a lack of air, part of the selenium exists in the form of CaSe, which is difficult to be completely extracted, the recovery rate is low, the production process is complicated, and the production cost is high.

Method used

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  • Method for extracting selenium from mercury-selenium acid mud waste
  • Method for extracting selenium from mercury-selenium acid mud waste
  • Method for extracting selenium from mercury-selenium acid mud waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Mix 20.03 g of the dried mercury-selenide mud waste with 3 ml of concentrated hydrochloric acid, 50 ml of deionized water, 40 ml of 30% hydrogen peroxide and 2 g of sodium chloride, and stir at room temperature for 3 h;

[0019] (2) Filtration and separation to remove insoluble impurity solids and collect the filtrate;

[0020] (3) Add 15 ml of ammonia water with a mass fraction of 30% to the filtrate, adjust the pH to about 8, and precipitate a white solid;

[0021] (4) After reacting at room temperature for 1 h, filter to remove the white solid impurities to obtain a light blue filtrate;

[0022] This white solid impurity is analyzed by X-ray diffraction (XRD) and is consistent with the standard card of product and aminomercuric chloride, Such as figure 2 shown.

[0023] (5) The filtrate was reduced with 8 ml of hydrazine hydrate with a mass fraction of 80%, and selenium was precipitated from the solution, stirred at room temperature for 1 h, washed and ...

Embodiment 2

[0026] (1) Mix 20.09 g of the dried mercury-selenide mud waste with 5 ml of concentrated hydrochloric acid, 50 ml of deionized water, 40 ml of 30% hydrogen peroxide and 2.0 g of sodium chloride, and stir at room temperature for 3 h;

[0027] (2) Filtration and separation to remove insoluble impurity solids and collect the filtrate;

[0028] (3) Add 15 ml of ammonia water with a mass fraction of 30% to the filtrate to adjust the pH to about 8.5,

[0029] Precipitated white solid;

[0030] (4) After reacting at room temperature for 1 h, filter to remove the white solid impurities to obtain a light blue filtrate;

[0031] (5) The filtrate was reduced with 8 ml of hydrazine hydrate with a mass fraction of 80%, the simple selenium was precipitated from the solution, stirred at room temperature for 1 h, washed and dried to obtain 5.0 g of selenium;

[0032] The content of selenium waste was tested by plasma emission spectroscopy to obtain a selenium content of 26%, and the seleni...

Embodiment 3

[0034] (1) Mix 20.42 g of dried mercury-selenide mud waste with 8 ml of concentrated hydrochloric acid, 50 ml of deionized water, 50 ml of 30% hydrogen peroxide and 2.0 g of sodium chloride, and stir at room temperature for 4 h;

[0035] (2) Filtration and separation to remove insoluble impurity solids and collect the filtrate;

[0036] (3) Add 20 ml of ammonia water with a mass fraction of 30% to the filtrate, adjust the pH to about 9, and precipitate a white solid;

[0037] (4) After reacting at room temperature for 1 h, filter to remove the white solid impurities to obtain a light blue filtrate;

[0038] (5) The filtrate was reduced with 8 ml of 80% hydrazine hydrate, the selenium element was precipitated from the solution, stirred at room temperature for 1 h, washed and dried to obtain 5.3 g of selenium;

[0039] The content of selenium waste was tested by plasma emission spectroscopy to obtain a selenium content of 27%, and the selenium element was tested by chemical tit...

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Abstract

The invention discloses a method for extracting selenium from mercury-selenium acid mud waste; elemental selenium is refined by a wet method under the condition of normal temperature, impurities in the mercury-selenium acid mud are removed, equipment is simple in requirements and easy to operate, and used chemical reagents basically have no pollution to the environment. Strong oxidability of hydrogen peroxide makes selenium oxidized into high-valence ions to go into a solution system, and a lot of heat is released for the system; addition of sodium chloride provides chlorine ions for the reaction system; a main impurity mercury is removed in a manner of a white precipitate ammoniated mercuric chloride; strong reducibility of hydrazine hydrate makes the high-valence selenium sufficiently reduced into elemental selenium. Results show that the content of elemental selenium reaches 90% or more and the recovery rate also reaches up to 90% or more.

Description

technical field [0001] The invention relates to a method for extracting selenium from waste mercury selenate mud, which belongs to the field of inorganic chemical industry. Background technique [0002] The selenium content in the earth's crust is 0.05 × 10 -6 , Selenium seldom exists alone in nature, and usually exists together with sulfide minerals. Selenium has a wide range of applications in photosensitive materials, catalysts, nutrition and health. The main source of selenium is the anode slime of electrolytic copper and the smelting dust of copper sulfide ore, and now a large amount of selenium-containing waste is produced in industry, and people recover selenium from various selenium-containing raw materials. Some zinc-lead fumes and acid sludge with relatively high mercury content in the acid system are also one of the important sources of selenium metal. [0003] At present, the method of extracting selenium from mercury-selenide mud is the method of adding calciu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02B09B3/00
Inventor 李凤杨成玉杨效娟
Owner XIANGTAN UNIV
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