Method for co-producing monopotassium phosphate and nitrogen phosphorus and potassium compound fertilizer

A technology of nitrogen, phosphorus and potassium compound fertilizer and potassium dihydrogen phosphate, which is applied in the direction of urea compound fertilizer, ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, etc., can solve the problem of insufficient utilization of raw materials for additional product mining, production equipment, and production environment impact, large dosage of phosphoric acid, etc., to achieve the effect of improving the production environment, improving the grade and grade, and reducing equipment corrosion

Inactive Publication Date: 2017-12-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of phosphoric acid used as the main raw material, it may have a certain impact on the production equipment and production environment.
In addition, this invention can only produce potassium dihydrogen phosphate, and does not make full use of raw materials for mining additional products

Method used

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  • Method for co-producing monopotassium phosphate and nitrogen phosphorus and potassium compound fertilizer
  • Method for co-producing monopotassium phosphate and nitrogen phosphorus and potassium compound fertilizer

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Embodiment 1

[0040] Such as figure 1 As shown, the process flow chart of the method for the coproduction of potassium dihydrogen phosphate and nitrogen, phosphorus and potassium compound fertilizers provided by the embodiment of the present invention, the method comprises the following steps:

[0041]S1. Add 400kg potassium chloride, 600kg ammonium dihydrogen phosphate and 1500kg-2000kg water into the reaction tank, add 40kg phosphoric acid to adjust the pH, the reaction temperature is 80°C-110°C, and the reaction time is 30min. Cool to 20° C. after the reaction, and separate and obtain 1000 kg of the first converted solid phase and 2000 kg of the first mother liquor. Wherein, the solid phase is converted to ammonium dihydrogen phosphate for the first time.

[0042] S2. The 1000kg of the first converted solid phase obtained in step S1 is converted and reacted with 500kg of potassium chloride and 3500kg to 4500kg of water in the reaction tank. The reaction temperature is 80°C to 110°C and ...

Embodiment 2

[0048] This embodiment provides a method for the joint production of potassium dihydrogen phosphate and nitrogen, phosphorus and potassium compound fertilizers, combining figure 2 As shown, the difference between the present embodiment and the first embodiment is that the method also includes the implementation of the S7 step after the implementation of the S6 step:

[0049] S7. Mix the five mother liquors obtained in step S5, the six mother liquors obtained in step S6, and urea at a mass ratio of 1:0.2-1:0.2-1, and repeat the process of step S6.

Embodiment 3

[0051] The present embodiment provides a method for co-production of potassium dihydrogen phosphate and NPK compound fertilizer, comprising the following steps:

[0052] S1. Add 400kg of potassium chloride, 700kg of ammonium dihydrogen phosphate and 1600kg to 2100kg of water into the reaction tank, add 40kg of phosphoric acid to adjust the pH, the reaction temperature is 80°C to 110°C, and the reaction time is 30min. After the reaction, it was cooled to 20° C., and 1100 kg of the first converted solid phase and 2100 kg of the first mother liquor were obtained by separation. Wherein, the solid phase is converted to ammonium dihydrogen phosphate for the first time.

[0053] S2. The 1100 kg of the first converted solid phase obtained in the step S1 is converted and reacted with 500 kg of potassium chloride and 4500 kg of water in the reaction tank. The reaction temperature is 80° C. to 110° C., and the reaction time is 30 minutes. After the reaction, it was cooled to 20° C., and...

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Abstract

The invention relates to the technical field of fertilizer production, and in particular to a method for coproducing monopotassium phosphate and nitrogen phosphorus and potassium compound fertilizer. The method comprises the following steps: S1, carrying out hybrid reaction on potassium salt, ammonium dihydrogen phosphate, phosphoric acid and water, and separating to obtain a first-time conversion solid phase and a primary mother solution; S2, carrying out hybrid reaction on the first-time conversion solid phase, sylivine and the water, and separating to obtain a second-time conversion solid phase and a secondary mother solution; S3, mixing the second-time conversion solid phase with the water, stirring, and separating to obtain a monopotassium phosphate product and a tertiary mother solution; S4, carrying out hybrid reaction on the tertiary mother solution, the secondary mother solution and the ammonium dihydrogen phosphate, and separating to obtain a second solid phase return scrap and a quartic mother solution, and returning the second solid phase return scrap to the step S2 for participating in the reaction; S5, mixing the quartic mother solution with the primary mother solution, and separating to obtain a first solid phase return scrap and a quintic mother solution, and returning the first solid phase return scrap to the step S1 for participating in the reaction; S6, mixing the quintic mother solution with urea, and separating to obtain a nitrogen phosphorus and potassium compound fertilizer product and a sextic mother solution. The method has the advantages of reasonable cost and low pollution emission.

Description

technical field [0001] The invention relates to the technical field of fertilizer production, in particular to a method for joint production of potassium dihydrogen phosphate and nitrogen, phosphorus and potassium compound fertilizers. Background technique [0002] Potassium chloride, monoammonium phosphate, and urea are all bulk fertilizer products, but except for potassium chloride, the output of monoammonium phosphate and urea has far exceeded the domestic market demand, and the price has dropped sharply in recent years. In recent years, it has also dropped significantly, and the added value of products is basically close to zero, or even negative, so related companies are actively developing high value-added products. With the implementation of the national fertilizer zero growth strategy and the promotion of facility agricultural fertilization technology, the transformation and upgrading of the chemical fertilizer industry is urgently required. Therefore, fertilizer pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05B7/00C05G1/00C05B17/00C05C9/00C05D1/02
Inventor 李海民陈育刚侯殿保杨海云
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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