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Method for continuously producing water-soluble monoammonium phosphate by using wet-process phosphoric acid

A technology of monoammonium phosphate and wet-process phosphoric acid, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems affecting the quality of monoammonium phosphate products, the quality of supernatant liquid is difficult to guarantee, and the quality of products is unqualified, so as to achieve easy continuous Modernized production, continuous production, and good product quality

Inactive Publication Date: 2014-12-24
云南云天化国际化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of this method is that the neutralization slurry is only separated by natural settlement, and the quality of the obtained supernatant is difficult to guarantee. It is difficult to operate in actual production and is not easy to control. Once the settlement effect of the neutralization slurry is not good, it is very difficult. It is easy to affect the quality of monoammonium phosphate products, resulting in unqualified product quality

Method used

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  • Method for continuously producing water-soluble monoammonium phosphate by using wet-process phosphoric acid

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Experimental program
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Effect test

Embodiment 1

[0035] Take 1500.0g of wet-process dilute phosphoric acid, according to 20% of the stoichiometric amount of sulfate radical, add phosphate rock slurry for reaction, after natural clarification, adjust to 26%P 2 o 5 Introduce ammonia gas into the clarified desulfurized dilute phosphoric acid for neutralization reaction until the neutralization degree of the slurry is 0.95. After the neutralized slurry is naturally settled, the obtained supernatant is filtered, and the filtrate is concentrated and dried to obtain water-soluble Monoammonium Phosphate Products. Gained water-soluble monoammonium phosphate analysis index is: effective P 2 o 5 %=54.27, water soluble P 2 o 5 %=53.58, N%=11.76, water-insoluble %=0.43, H 2 O% = 1.20, pH = 4.32.

Embodiment 2

[0037] Take 1500.0g of wet dilute phosphoric acid, according to 50% of the stoichiometric amount of sulfate, add phosphate rock slurry for reaction, after natural clarification, adjust to 26%P 2 o 5 Introduce ammonia gas into the clarified desulfurized dilute phosphoric acid for neutralization reaction until the neutralization degree of the slurry is 1.00. After the neutralized slurry is naturally settled, the obtained supernatant is filtered, and the filtrate is concentrated and dried to obtain water-soluble Monoammonium Phosphate Products. The resulting monoammonium phosphate analysis index is: effective P 2 o 5 %=54.78, water soluble P 2 o 5 %=54.38, N%=12.34, water-insoluble %=0.21, H 2 O% = 0.50, pH = 4.43.

Embodiment 3

[0039] Take 1500.0g wet dilute phosphoric acid, according to 100% of the sulfate radical stoichiometry, add phosphate rock slurry for reaction, after natural clarification, adjust to 24%P 2 o 5 Introduce ammonia gas into the clarified desulfurized dilute phosphoric acid for neutralization reaction until the neutralization degree of the slurry is 1.02. After the neutralized slurry is naturally settled, the obtained supernatant is filtered, and the filtrate is concentrated and dried to obtain water-soluble Monoammonium Phosphate Products. Gained water-soluble monoammonium phosphate analysis index is: effective P 2 o 5 %=56.69, water soluble P 2 o 5 %=56.12, N%=11.85, water-insoluble %=0.17, H 2 O% = 1.27, pH = 4.53.

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Abstract

The invention discloses a method for continuously producing water-soluble monoammonium phosphate by using wet-process phosphoric acid. The method comprises the following steps: adding phosphoric ore pulp to wet-process dilute phosphoric acid; after natural sedimentation, carrying out neutralization reaction between clear desulfurated dilute phosphoric acid at the top and ammonia gas, wherein the neutralization degree of slurry is 0.95-1.05; carrying out natural sedimentation of the neutralized slurry in a settlement trough; filtering ammonium phosphate supernatant in a filter; concentrating and drying the obtained supernatant, so as to prepare the water-soluble monoammonium phosphate, wherein a filter cake and filter residue which are obtained after filtering can be used for preparing an agricultural compound fertilizer. According to the method, the problem of a traditional method that corresponding impurity removal depth can be reached by means of improving the neutralization degree of the slurry and carrying out neutralization reaction many times is avoided, neutralization reaction is carried out only once, and operation is facilitated. Meanwhile, the production efficiency is also improved, the obtained water-soluble monoammonium phosphate is good in quality, and the content of insoluble matter is low. In addition, the method is short in technological process and relatively simple in production control and can be put into continuous production easily.

Description

technical field [0001] The invention belongs to the technical field of monoammonium phosphate production, and in particular relates to a method for continuously producing water-soluble monoammonium phosphate using dihydrate wet-process dilute phosphoric acid as a raw material. Background technique [0002] Monoammonium phosphate is an important phosphorus chemical product, mainly in agricultural grade and industrial grade. In recent years, water-soluble fertilizers have been widely recognized for their quick-acting and high-utilization characteristics. However, due to the poor water solubility of agricultural grade monoammonium phosphate and the high content of water insoluble matter, it cannot meet the requirements for the use of water soluble fertilizers. At present, industrial-grade monoammonium phosphate is generally used as water-soluble monoammonium phosphate, but the high production cost of industrial-grade monoammonium phosphate limits the promotion and use of water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
Inventor 师永林韩喜超彭明辉李勇薛河南解忠勇潘继斐曹光玲蔡昆林
Owner 云南云天化国际化工有限公司
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