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
CN104229764AInactive Publication Date: 2014-12-24云南云天化国际化工有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
云南云天化国际化工有限公司
Publication Date
2014-12-24
Estimated Expiration
Not applicable · inactive patent

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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.
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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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