Method for producing diammonium phosphate by concentrating acid slime, and secondary ammoniation reactor

An ammonification reactor and ammonification reaction technology, applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate, etc., can solve the problem of high moisture content in concentrated slurry, high drying energy consumption, and inability to add ammonia, etc. problems, and achieve the effects of environmental protection, remarkable energy saving effect and improved utilization rate
CN1872669AInactive Publication Date: 2006-12-06四川川大中德环保技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
四川川大中德环保技术有限公司
Publication Date
2006-12-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention discloses a method for producing di-ammonium phosphate by concentration of acidic slurry. The method comprises: (1) performing a first ammonification on diluted phosphoric acid to obtain an acidic slurry of ammonium dihydrogen phosphate; (2) concentrating so that the water content is 13-20%; (3) performing a second ammonification so that the neutralization degree is increased to 1.30-1.50; (4) performing further ammonification so that the neutralization degree reaches 1.60-1.90; (5) granulating and controlling the water content at 2-4%. The mol. ratio of P to N in ammonium dihydrogen phosphate is 0.32-0.40.
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Description

technical field

[0001] The invention belongs to the field of diammonium phosphate production, in particular to a method for producing diammonium phosphate by concentrating slurry and equipment for secondary ammonification. Background technique

[0002] Chinese patent ZL 92106621.X discloses a production method of diammonium phosphate. The process steps are: a. neutralize the dilute phosphoric acid and ammonia gas once to make the neutralization degree reach 1.1-1.2; Reduce to 30%; c. The concentrated slurry overflows to the neutralization tank for secondary neutralization reaction with gas ammonia, so that the neutralization degree of the slurry is increased to 1.5-1.8, and the moisture is reduced to about 25%. The temperature of the slurry is 100-110°C; d. The slurry after the secondary neutralization reaction is sent to the spray granulation dryer for granulation and drying. Though said method can obtain the diammonium phosphate that meets GB1...

Claims

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