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Preparation technique of potassium nitrate

A preparation process, potassium nitrate technology, applied in the field of potassium nitrate preparation process, can solve the problems of low yield rate of one-time finished products, unrecyclable waste, limited source of raw materials, etc., achieve low cost, reduce production cost, and solve environmental protection problems Effect

Inactive Publication Date: 2008-05-21
WENSHUI COUNTY ZHENXING CHEM FERTILIZER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a potassium nitrate preparation process in order to solve the problems of limited source of raw materials, high production cost, high energy consumption, low yield of one-time finished products and unrecyclable waste in the existing potassium nitrate preparation method.

Method used

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  • Preparation technique of potassium nitrate

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Embodiment 1

[0019] A preparation process for potassium nitrate, comprising the following steps: (1) mixing potassium chloride and dilute nitric acid with a concentration of 30% according to a molar ratio of 1: 1.4, under the conditions of 0.01Mpa and a temperature of 30°C Under the following reaction, a mixed solution containing potassium nitrate, dilute nitric acid and hydrochloric acid is generated, and the mesh number of potassium chloride is 160 mesh; (2) the mixed solution obtained above is cooled to normal temperature, then continued to be frozen to 0 ° C, and centrifuged , obtain the primary crude product potassium nitrate and the primary mother liquor containing potassium nitrate, hydrochloric acid and dilute nitric acid; (3) obtain the finished product after refining the primary crude product potassium nitrate, then dry and pack, and simultaneously put the primary mother liquor under a negative pressure of 0.01Mpa , the temperature is evaporated under the condition of 70 ℃ and the...

Embodiment 2

[0021] A preparation process for potassium nitrate, comprising the following steps: (1) mixing potassium chloride and dilute nitric acid with a concentration of 40% according to a molar ratio of 1: 1.5; Under the reaction, a mixed solution containing potassium nitrate, dilute nitric acid and hydrochloric acid is generated, and the mesh number of potassium chloride is 170 mesh; (2) the mixed solution obtained above is cooled to normal temperature, then continues to be frozen to -5 ° C, and centrifuged Separate to obtain primary crude product potassium nitrate and the primary mother liquor containing potassium nitrate, hydrochloric acid and dilute nitric acid; (3) obtain finished product after refining the primary crude product potassium nitrate, then dry and pack, and simultaneously place primary mother liquor at negative 0.02Mpa , the temperature is evaporated under the condition of 80 ℃ and the primary mother liquor is concentrated to 55 Baume degree, obtain the mixed gas comp...

Embodiment 3

[0023]A preparation process for potassium nitrate, comprising the following steps: (1) mixing potassium chloride and dilute nitric acid with a concentration of 30% according to a molar ratio of 1: 1.5; Under reaction, generate the mixed solution that contains potassium nitrate, dilute nitric acid and hydrochloric acid, the mesh number of potassium chloride is 160-170 order; (2) the mixed solution obtained above is cooled to normal temperature, then continues to freeze to-5 ℃, and Carry out centrifugation to obtain primary crude product potassium nitrate and primary mother liquor containing potassium nitrate, hydrochloric acid and dilute nitric acid; (3) obtain finished product after carrying out refining treatment with primary crude product potassium nitrate, then dry, pack and get final product, simultaneously primary mother liquor is in negative The pressure is 0.01Mpa, the temperature is to evaporate under the condition of 80 ℃ and make the primary mother liquor concentrate ...

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Abstract

The invention relates to the technical field of inorganic chemical industry, specifically a preparation process of potassium nitrate, which solves the problems of limited source of raw materials, high production cost, high energy consumption, low yield of one-time finished products and unrecyclable waste in the existing method. Potassium chloride and dilute nitric acid are mixed in proportion, reacted under the conditions of negative pressure of 0.01-0.02MPa and temperature of 30-40°C, cooling the mixed solution generated by the reaction to normal temperature, continuing to freeze, and then centrifuging to obtain crude potassium nitrate and primary mother liquor, the crude potassium nitrate is refined to obtain the finished product, the primary mother liquor is evaporated and concentrated, and hydrochloric acid and nitric acid are separated, and the two are separated by condensation and extraction, and the concentrated secondary crude potassium nitrate is cooled, frozen, and centrifuged to obtain di Sub-crude potassium nitrate and secondary mother liquor, the mother liquor is returned to the system for recycling. The one-time yield of potassium nitrate in the invention is high, 85-90%, so that the follow-up treatment process is simple, energy consumption is low, and cost is low; no pollution is realized, no waste water is discharged, and the environmental protection problem is completely solved.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a preparation process of potassium nitrate. Background technique [0002] Potassium nitrate is one of the main products of potassium salt products. In industry, it is mainly used in fireworks, black powder, optical glass, special glass and other fields. In agriculture, it is fertilizer grade potassium nitrate or agricultural potassium nitrate, which is a high-quality Potassium nitrogen binary compound fertilizer, containing more than 44% potassium oxide and more than 13% nitrogen, all of which are soluble nutrients, can be completely absorbed by crops, and are mainly used in tobacco, economic crops, horticulture and other fields, which can significantly increase the yield of crops It is one of the high-efficiency chemical fertilizer varieties needed for the development of high-efficiency and high-quality agriculture. [0003] After the development of potassiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/04
Inventor 党骏武一王维泽李宝玉石砚池武晓冰
Owner WENSHUI COUNTY ZHENXING CHEM FERTILIZER
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