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Method for improving sodium sulfide solution concentration by leaching black ash for three times

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

Active Publication Date: 2015-02-04
南风化工(运城)集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 improving sodium sulfide solution concentration by leaching black ash for three times

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Experimental program
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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 industrialized application of a sodium-sulfide solution three-time black-ash (a product which is obtained by calcining barite and has the main composition barium sulfide) leaching technology to barium sulfate production industry, and concretely discloses a method for improving sodium sulfide solution concentration by leaching black ash for three times. The method comprises: using a sodium sulfide solution with the concentration of 4-5% to perform leaching on crushed black ash for three times, namely, performing precipitate separation on a solution subjected to first leaching to obtain a mother liquid I, using the mother liquid I to continue to perform secondary leaching on black ash, and performing secondary precipitate separation on the leached solution to obtain a mother liquid II, using the mother liquid II to performing third leaching, and performing precipitate separation on a solution subjected to third leaching to obtain a mother liquid III, using the mother liquid III to react with a sodium sulfate solution to generate barium sulfate and a sodium sulfide solution which has the concentration of 8-10% after three times of leaching, performing solid-liquid separation on the sodium sulfide solution, and then performing precipitation and clarification, so as to enable the sodium sulfide solution to enter a next process of evaporation. The method is reasonable in design, helps to improve the concentration of the sodium sulfide solution and reducing the evaporation amount by performing leaching on black ash for three times, and realizes the purpose of reducing production cost of 60 alkali (an alkali sulfide with the sodium sulfide content of 60%).

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, Generate barium sulfate and sodium sulfide solution with a concentration of 4-5%. 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 first...

Claims

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Application Information

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Patent Type & Authority Applications(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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