Method for increasing the concentration of sodium sulfide solution by leaching black ash three times

A technology of solution concentration and sodium sulfate solution, applied in chemical instruments and methods, alkali metal sulfide/polysulfide, inorganic chemistry, etc., can solve the problems of low concentration of sodium sulfide solution and high cost of 60 alkali evaporation, and reduce evaporation The effect of increasing the concentration of sodium sulfide solution and reasonable design

Active Publication Date: 2016-04-27
南风化工(运城)集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of low concentration of sodium sulfide solution and high evaporation cost of producing 60 alkali in the existing technology, the present invention provides a method for increasing the concentration of sodium sulfide solution by leaching black ash three times

Method used

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  • Method for increasing the concentration of sodium sulfide solution by leaching black ash three times

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Effect test

Embodiment 1

[0016] The resulting barium sulfide and sodium sulfate solution reacted to form barium sulfate and sodium sulfide solution after soaking black ash with water, the concentration of sodium sulfide solution is 4%.

[0017] The black ash was leached three times with a sodium sulfide solution with a concentration of 4%, and the steps were as follows:

[0018] ① first crush the black ash, and then use 4% sodium sulfide solution for a leaching; ② precipitate and separate the leached solution to obtain the mother liquor I; ③ use the mother liquor Ⅰ to continue the second leaching of the black ash, The leached solution is subjected to secondary precipitation and separation to obtain mother liquor II; ④ three times of leaching with mother liquor II, and the solution after three leachings is subjected to precipitation and separation to obtain mother liquor III; ⑤ mother liquor III contains S 2- 、Na + 、Ba 2+ ions, react with sodium sulfate solution to form barium sulfate and sodium sulf...

Embodiment 2

[0024] The resulting barium sulfide and sodium sulfate solution reacted to form barium sulfate and sodium sulfide solution after soaking black ash with water, the concentration of sodium sulfide solution is 5%.

[0025] The black ash is leached three times with sodium sulfide solution, the steps are as follows:

[0026] ① first crush the black ash, and then use 5% sodium sulfide solution for a leaching; ② precipitate and separate the leached solution to obtain the mother liquor I; ③ use the mother liquor Ⅰ to continue the second leaching of the black ash, The leached solution is subjected to secondary precipitation and separation to obtain mother liquor II; ④ three times of leaching with mother liquor II, and the solution after three leachings is subjected to precipitation and separation to obtain mother liquor III; ⑤ mother liquor III contains S 2- 、Na + 、Ba 2+ ions, react with sodium sulfate solution to form barium sulfate and sodium sulfide solution; ⑥The concentration of...

Embodiment 3

[0032] The resulting barium sulfide and sodium sulfate solution reacted to form barium sulfate and sodium sulfide solution after soaking black ash with water, the concentration of sodium sulfide solution is 4.8%.

[0033] The black ash is leached three times with sodium sulfide solution, the steps are as follows:

[0034] ① first crush the black ash, and then use 4.8% sodium sulfide solution for a leaching; ② precipitate and separate the leached solution to obtain the mother liquor Ⅰ; ③ use the mother liquor Ⅰ to continue to leaching the black ash twice, The leached solution is subjected to secondary precipitation and separation to obtain mother liquor II; ④ three times of leaching with mother liquor II, and the solution after three leachings is subjected to precipitation and separation to obtain mother liquor III; ⑤ mother liquor III contains S 2- 、Na + 、Ba 2+ ions, react with sodium sulfate solution to form barium sulfate and sodium sulfide solution; ⑥The concentration of ...

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Abstract

The invention discloses the industrial application of the technique of leaching black ash three times with sodium sulfide solution in the barium sulfate production industry. Specifically, it is a method for increasing the concentration of sodium sulfide solution by leaching black ash three times. The black ash is leached three times, that is, the solution that has been leached for the first time is precipitated and separated to obtain the mother liquor I, and the mother liquor I is used to continue to leaching the black ash for the second time, and the leached solution is subjected to the second precipitation and separation to obtain the mother liquor II. Carry out three leaching with mother liquor II again, after the solution after three leachings is precipitated and separated, mother liquor III is obtained, and mother liquor III is reacted with sodium sulfate solution to form barium sulfate and sodium sulfide solution, and the concentration of sodium sulfide solution after three leaching can be Reaching 8~10%, the solid-liquid separation sodium sulfide solution is precipitated, clarified and then enters the next process to evaporate. The invention has a reasonable design, increases the concentration of the sodium sulfide solution by leaching the black ash three times, reduces the evaporation amount, and achieves the purpose of reducing the evaporation cost of producing 60 alkali.

Description

technical field [0001] The invention discloses the industrial application of the technique of leaching black ash three times with sodium sulfide solution in the barium sulfate production industry, specifically a method for increasing the concentration of sodium sulfide solution by leaching black ash three times. Background technique [0002] In the barium sulfate industry, the production process of barium sulfate by Glauber’s salt-black ash method is: the barium sulfide solution obtained after soaking black ash (the product obtained after barite calcination, the main component is barium sulfide) reacts with sodium sulfate, Barium sulfate and sodium sulfide solution with a concentration of 4-5% are generated. After the sodium sulfide solution is precipitated and clarified, it enters the evaporator to produce 60 alkali (sodium sulfide with a sodium sulfide content of 60%). Sodium sulfide solution evaporation process: The sodium sulfide solution with a concentration of 4-5% is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01B17/22
CPCC01B17/22C01F11/462
Inventor 荆小兵周新国许涛王兰君赵秀萍伍洲生武向前李胜田利鹏明江波
Owner 南风化工(运城)集团有限公司
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