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A kind of method for producing potassium sulfate by passing ammonia through refined ammonium chloride

A technology of potassium sulfate and ammonium chloride, which is applied in the purification of ammonium chloride, ammonium halide, alkali metal sulfite/sulfate, etc. It can solve the problems of unstable product quality, high consumption of raw materials, and low conversion rate of potassium chloride. problems, to achieve good industrial utilization and promotion value, reliable process operation guarantee, and mild process operating conditions

Inactive Publication Date: 2018-01-16
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] In the above-mentioned method for preparing potassium sulfate, there are many shortcomings and deficiencies. In summary, it is mainly that 1. in the process, auxiliary raw materials must be added to make the quality of potassium sulfate product qualified, and the cost is high; 2. the process does not have a closed loop, and different links have emissions , environmental pollution, increased consumption of raw materials; ③ preparation of by-product ammonium chloride, high potassium oxide content, unstable product quality; Compared with the high conversion rate of French potassium, the consumption of raw materials is high, and the economy is poor

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  • A kind of method for producing potassium sulfate by passing ammonia through refined ammonium chloride

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Experimental program
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Embodiment l

[0042] 1. Add 155g of ammonium sulfate into 155g of hot water at 95°C and dissolve completely under stirring; add 150g of potassium chloride into 300g of hot water at 95°C and dissolve completely under stirring. Slowly add the potassium chloride hot solution into the ammonium sulfate solution with stirring and heat preservation, carry out the metathesis reaction for 60 minutes, cool the slurry to 40°C for 35 minutes after the reaction, and carry out solid-liquid separation in separation one to obtain 180.4g of crude potassium sulfate , 345g mother liquor Ⅰ, measured mother liquor specific gravity d=1.1632.

[0043] Heat 220g of aqueous solution containing 16% potassium chloride to 60°C under stirring, slowly add 104.4g of crude potassium sulfate prepared into the hot solution and keep it warm for 30min, then cool the slurry to 40°C for cooling and crystallization for 30min for solid-liquid separation . Obtain mother liquor II 219g, product refined potassium sulfate 92g, produ...

Embodiment 2

[0049] One, the mother liquor II 228.5g of the solid-liquid separation after potassium sulfate is refined, the mother liquor IV 170.3g of the crude ammonium chloride solid-liquid separation and 108g of the circulating solid product separated by the intermediate reaction are added in the metathesis reactor successively. Stir evenly at 85°C, then add 42g of potassium chloride as the raw material. After the addition is complete, react at 85°C for 65 minutes, then cool the slurry to 40°C for cooling and crystallization for 30 minutes, and perform solid-liquid separation in separation (1). Prepare 105g crude potassium sulfate, 350g mother liquor I, measure mother liquor specific gravity d=1.1695.

[0050] Heat 270g of aqueous solution containing 14% potassium chloride to 90°C in a refining kettle, add 105g of crude potassium sulfate under stirring, slowly add to the hot solution to 90°C and keep it warm for 70min, then cool the slurry to 35°C for cooling and crystallization for 30mi...

Embodiment 3

[0055] One, the mother liquor II 223.4g of the solid-liquid separation after potassium sulfate is refined, the mother liquor IV 145.3g of the crude ammonium chloride solid-liquid separation and 110.3g of the circulating solid product separated by the intermediate reaction are added in the double decomposition reactor successively. Stir evenly at 80°C, then add 44.6g of potassium chloride as the raw material. After the addition is complete, react at 80°C for 50 minutes, then cool the slurry to 35°C for cooling and crystallization for 40 minutes, and perform solid-liquid separation in the separation (1). separate. Obtain 103g crude potassium sulfate, 341g mother liquor I, measure mother liquor specific gravity d=1.1655.

[0056] Heat 216g of aqueous solution containing potassium chloride 16% to 75°C in the refining kettle, add 103g of crude potassium sulfate under stirring, slowly add to the hot solution to 75°C and keep it warm for 50min, then cool the slurry to 40°C for coolin...

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Abstract

A method for preparing potassium sulfate and refining ammonium chloride by introducing ammonia comprises slowly adding a potassium chloride hot solution into an ammonium sulfate solution for metathesis reaction, cooling the reaction solution and performing solid-liquid separation, further refining solid crude potassium sulfate to obtain potassium sulfate, performing an intermediate reaction on the mother liquid I to prepare crude ammonia chloride, and introducing ammonia for refining ammonium chloride, so as to obtain the ammonium chloride product. The method possesses the advantages of high potassium sulfate purity, no pollution and high potassium oxide conversion rate.

Description

technical field [0001] A method for preparing potassium sulfate by refining ammonium chloride through ammonia The invention belongs to a method for producing potassium sulfate, and in particular relates to a method for preparing potassium sulfate by refining ammonium chloride through ammonia. Background technique [0002] Potassium sulfate is an important chlorine-free potassium fertilizer, which is widely used in economic crops such as tobacco, citrus, watermelon, tea, grapes, sugar beet, and sugar cane. In addition, it is also used in the manufacture of potassium persulfate, potassium alum, potassium water glass and potassium carbonate. It is also widely used in medicine, glass, dyes and other industries. [0003] At present, the production methods of potassium sulfate in the world mainly include Mannheim furnace method, double decomposition method, association method and comprehensive utilization method of potassium ore. More than half of potassium sulfate is processed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/16C01D5/16
CPCC01C1/164C01D5/16
Inventor 程加林池永庆贾攀锋路敬吕亚臻王远洋
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY