Control method for granularity of potassium nitrate product produced through double decomposition

The technology of a metathesis method and a control method is applied in the field of particle size control of potassium nitrate products by metathesis method, can solve the problems of unstable product purity, uneven crystal particle size, and high operational requirements, and achieves reduction of nucleation amount, uniform particle size, guaranteeing The effect of product quality

Inactive Publication Date: 2015-08-19
甘肃丰谷高科农业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current potassium nitrate production process, there are problems such as large energy con...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 A method for controlling the particle size of potassium nitrate product by double decomposition method, comprising the following steps:

[0019] ⑴ Potassium chloride and ammonium nitrate by K + / NH 4 + =0.9 molar ratio into the metathesis tank, while the circulating mother liquor and washing water are also put into the metathesis tank, mixed to form a slurry with a solid content of 50%, and then the temperature is raised according to the conventional method for the metathesis reaction to obtain the reaction slurry.

[0020] ⑵The reaction slurry is sent to the potassium nitrate cooling crystallization reactor, and the temperature is lowered from 120°C to 80°C, and the residence time is 0.5 hours. After 0.5 hour, a potassium nitrate crystallizer underflow slurry was obtained.

[0021] (3) Import the underflow slurry of the potassium nitrate crystallizer into the cyclone to obtain the underflow of coarse granular potassium nitrate crystals and the feed liq...

Embodiment 2

[0024] Example 2 A method for controlling the particle size of potassium nitrate product by double decomposition method, comprising the following steps:

[0025] ⑴ Potassium chloride and ammonium nitrate by K + / NH 4 + = 1.1 molar ratio into the metathesis tank, and at the same time, the circulating mother liquor and washing water are also put into the metathesis tank, mixed to form a slurry with a solid content of 40%, and then the temperature is raised according to the conventional method to carry out the metathesis reaction to obtain the reaction slurry.

[0026] ⑵Send the reaction slurry into the first potassium nitrate cooling crystallization reactor, firstly cool down from 110°C to 80°C, stay for 0.5 hours, and then enter the second potassium nitrate cooling crystallization reactor from 80°C to 30°C , after a residence time of 0.5 hour, the potassium nitrate crystallizer underflow slurry was obtained.

[0027] (3) Import the underflow slurry of the potassium nitr...

Embodiment 3

[0030] Example 3 A method for controlling the particle size of potassium nitrate product by double decomposition method, comprising the following steps:

[0031] ⑴ Potassium chloride and ammonium nitrate by K + / NH 4 + =1.3 molar ratio into the metathesis tank, while the circulating mother liquor and washing water are also put into the metathesis tank, mixed to form a slurry with a solid content of 40%, and then the temperature is raised according to the conventional method for the metathesis reaction to obtain the reaction slurry.

[0032] ⑵The reaction slurry is sent to the first potassium nitrate cooling crystallization reactor, and the temperature is lowered from 100°C to 70°C, and the residence time is 0.6 hours, and then the temperature is lowered from 70°C to 25°C in the second potassium nitrate cooling crystallization reactor , After a residence time of 0.6 hour, the potassium nitrate crystallizer underflow slurry was obtained.

[0033] (3) Import the underflow...

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PUM

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Abstract

The invention relates to a control method for the granularity of a potassium nitrate product produced through double decomposition. The control method comprises the following steps: (1) adding potassium chloride, ammonium nitrate and mother liquor into a double decomposition tank for double decomposition so as to obtain reaction slurry; (2) delivering the reaction slurry into a potassium nitrate cooling crystallization reaction vessel and carrying out cooling crystallization in two steps so as to obtain potassium nitrate crystallizer underflow slurry; (3) introducing the potassium nitrate crystallizer underflow slurry into a cyclone so as to separately obtain coarse-grain potassium nitrate crystal underflow and a feed liquid containing fine potassium nitrate crystal and allowing the feed liquid containing fine potassium nitrate crystal to return to the potassium nitrate cooling crystallization reaction vessel in the step (2); (4) separating the coarse-grain potassium nitrate crystal underflow from a lower outlet of the cyclone and carrying out centrifugation, washing and drying so as to separately obtain crystallization mother liquor and a large-granule potassium nitrate product with crystal granularity stabilized in a range of 1.0 to 1.5 mm and uniform particle sizes; and (5) evaporating the crystallization mother liquor according to a conventional method so as to separately obtain a byproduct--ammonium chloride and circulating mother liquor. The method provided by the invention is simple and reliable, is convenient to operate and has obvious effect.

Description

technical field [0001] The invention relates to a production method of a large particle potassium nitrate product, in particular to a method for controlling the granularity of a potassium nitrate product by a double decomposition method. Background technique [0002] Potassium nitrate is a high-quality nitrogen-potassium binary compound fertilizer, all of which are instant nutrients. Potassium ions and nitrate ions can be quickly absorbed by crops. It is a chemical nitrogen-potassium compound fertilizer with a promising market prospect. [0003] The domestic production of potassium nitrate by metathesis mainly adopts the ammonium nitrate-potassium chloride process, and is mainly based on the four-step circulation method: add water, mother liquor, potassium chloride and ammonium nitrate to the circulating mother liquor, and when the temperature drops, potassium nitrate crystallizes out. Ammonium nitrate is added to the mother liquor, and after evaporation and concentration, c...

Claims

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Application Information

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IPC IPC(8): C01D9/10
Inventor 牛忠顾广统
Owner 甘肃丰谷高科农业有限公司
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