A kind of sodium sulfide and sodium sulfate production process of dilute alkali sulfide solution and Glauber's salt decahydrate

A technology of soda sulfide and sodium sulfate, which is applied in the fields of alkali metal sulfite/sulfate purification, sulfur compounds, chemical instruments and methods, etc., and can solve frequent fouling of evaporation tanks, product quality, high steam consumption, low raw material concentration, etc. problems, to achieve the effect of high quality main and by-products, low investment, concise and reasonable process flow

Active Publication Date: 2020-03-24
南风化工(运城)集团有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] When the known Glauber's salt-black ash method is used to produce industrial precipitated barium sulfate, a dilute solution of alkali sulfide with a concentration of about 5% is produced. At present, the method of four-effect evaporation concentration and second-effect evaporation for cooling the finished product mother liquor is used to recover the alkali sulfide, but this method has a raw material concentration Very low, very high steam consumption and frequent fouling of the evaporator tank and low product quality

Method used

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  • A kind of sodium sulfide and sodium sulfate production process of dilute alkali sulfide solution and Glauber's salt decahydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: take 100m 3 Dilute alkali sulfide (Na 2 S 55g / l) dissolves 82.5 tons of Glauber's salt decahydrate (Na 2 SO 4 10H 2 O, containing Na 2 SO 4 40%) to get 110m 3 Brine (Na 2 S 50g / l, Na 2 SO 4 300g / l) as raw material, after entering the high-temperature nitrification evaporation system to evaporate and separate to obtain 33 tons of sodium sulfate (Na 2 SO 4 ) intermediate product (poor whiteness) and 6.9m 3 High temperature nitrification mother liquor (Na 2 S800g / l, Na 2 SO 4 0.40g / l), the evaporation temperature of high-temperature nitric acid production is 130°C; 6.9m 3 High temperature nitrification mother liquor (Na 2 S 800g / l, Na 2 SO 4 0.40g / l) into the low-temperature alkali-making evaporative cooling system to evaporate and cool and separate to obtain 5.5 tons of sodium sulfide (Na 2 S) intermediate products and 0.08m 3 Low temperature alkali making mother liquor (Na 2 S 261g / l, Na 2 SO 4 36g / l), 0.08m 3 Low temperature alk...

Embodiment 2

[0018] Embodiment 2: take 100m 3 Dilute alkali sulfide (Na 2 S 55g / l) dissolves 82.5 tons of Glauber's salt decahydrate (Na 2 SO 4 10H 2 O, containing Na 2 SO 4 40%) to get 110m 3 Brine (Na 2 S 50g / l, Na 2 SO 4 300g / l) as raw material, after entering the high-temperature nitrification evaporation system to evaporate and separate to obtain 33 tons of sodium sulfate (Na 2 SO 4 ) intermediate product (poor whiteness) and 12.2m 3 High temperature nitrification mother liquor (Na 2 S 450g / l, Na 2 SO 4 4.7g / l), the evaporation temperature of high-temperature nitric acid production is 80°C; 12.2m 3 High temperature nitrification mother liquor (Na 2 S 450g / l, Na 2 SO 4 4.7g / l g / l) enters the low-temperature soda-making evaporative cooling system and separates after evaporation and cooling to obtain 5.5 tons of sodium sulfide (Na 2 S) intermediate products and 0.96m 3 Low temperature alkali making mother liquor (Na 2 S 200g / l, Na 2 SO 4 60g / l), 0.96m 3 Low te...

Embodiment 3

[0019] Embodiment 3: take 100m 3 Dilute alkali sulfide (Na 2 S 55g / l) dissolves 82.5 tons of Glauber's salt decahydrate (Na 2 SO 4 10H 2 O, containing Na 2 SO 4 40%) to get 110m 3 Brine (Na 2 S 50g / l, Na 2 SO 4300g / l) as raw material, after entering the high-temperature nitrification evaporation system to evaporate and separate to obtain 33 tons of sodium sulfate (Na 2 SO 4 ) intermediate product (poor whiteness) and 5.0m 3 High temperature nitrification mother liquor (Na 2 S1100g / l, Na 2 SO 4 0.2g / l), the evaporation temperature of high-temperature nitric acid production is 170°C; 5.0m 3 High temperature nitrification mother liquor (Na 2 S 1100g / l, Na 2 SO 4 0.2g / l) into the low-temperature alkali-making evaporative cooling system to evaporate and cool and separate to obtain 5.5 tons of sodium sulfide (Na 2 S) intermediate products and 0.2m 3 Low temperature alkali making mother liquor (Na 2 S395g / l, Na 2 SO 4 5.0g / l), 0.2m 3 Low temperature alkali ...

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Abstract

The invention discloses a technology for producing sodium sulphide and sodium sulfate by sodium sulfide thin liquid and sodium sulfate mirabilite. Brine obtained by dissolving the sodium sulfate mirabilite in the sodium sulfide thin liquid is taken as a raw material; the raw material enters a high-temperature nitre manufacturing system to be evaporated and separated to obtain a sodium sulfate intermediate product and high-temperature nitre manufacturing mother liquor; the high-temperature nitre manufacturing mother liquor enters a low-temperature alkali manufacturing evaporation and cooling system to be evaporated and cooled to be separated to obtain a sodium sulphide product and low-temperature alkali manufacturing mother liquor; the low-temperature alkali manufacturing mother liquor is directly circulated to a high-temperature nitre manufacturing evaporation system; the sodium sulfate intermediate product is subjected to multi-time countercurrent washing by a sodium sulfate solution,the products, including the sodium sulfate and nitre washing liquid are obtained after solid-liquid separation, and the nitre washing liquid is circulated to the high-temperature nitre manufacturingevaporation system. The technology has the characteristics of simple and reasonable technological process, investment saving, high quality of main products and by-products, high raw material adaptation, low steam and power energy consumption, comprehensive waste utilization, zero emission of brine closed loop and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, in particular to a process for producing sodium sulfide and sodium sulfate from dilute alkali sulfide solution and Glauber's salt decahydrate. Background technique [0002] The known Glauber's salt-black ash method produces about 5% concentration of alkali sulfide dilute liquid when producing industrial precipitated barium sulfate. At present, four-effect evaporation is used to concentrate and the method of second-effect evaporation to cool the finished product mother liquor is used to recover alkali sulfide, but this method has raw material concentration. Very low, very high steam consumption and frequent fouling of the evaporation tank and low product quality. Contents of the invention [0003] The object of the present invention is to provide a process for producing sodium sulfide and sodium sulfate with dilute sodium sulfide solution and Glauber's salt decahydrate, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/16C01B17/36
CPCC01B17/36C01D5/16C01P2006/80
Inventor 彭赛军朱晓峰杨骅侯涛张国红张铁柱苏棣尉争鸣
Owner 南风化工(运城)集团有限公司
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