Coproduction method of diammonium phosphate and monoammonium phosphate and equipment for neutralizing washing liquid

A technology of monoammonium phosphate and diammonium phosphate, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of reducing the capacity and life of phosphoric acid concentration equipment, affecting the stability of the production line, and high investment in production capacity, and extending the life of the concentration equipment , The effect of improving the capacity of the concentration equipment and reducing the cost of the product
CN1442358AInactive Publication Date: 2003-09-17SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN UNIV
Publication Date
2003-09-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A process for preparing diammonium phosphate and ammonium phosphate features that one part of extracted phosphoric acid is used to prepare diammonium phosphate through concentrating, neutralizing, granulating and drying and the other part is used to prepare ammonium phosphate through washing the tail gas generated in neutralizing-granulating steps, neutralizing the washing liquid, concentrating and spraying drying (or granulating and drying). The neutralizing equipment for washing liquid is composed of flash evaporator, reactino lifting up tube and lowering down tube and forced circulating pump.
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Description

1. Technical field

[0001] The invention belongs to the field of ammonium phosphate production, in particular to a co-production method of diammonium phosphate and monoammonium phosphate and special equipment. 2. Background technology

[0002] There are two basic methods for the production of ammonium phosphate, one is the "phosphoric acid concentration method" and the other is the "neutralization slurry concentration method". "Phosphoric acid concentration method" is to concentrate the extracted dilute phosphoric acid to the required concentration and then neutralize, granulate and dry, which is mainly used for high-quality phosphate rock; "Neutralization slurry concentration method" is to firstly dilute the extracted phosphoric acid with ammonia Blend into a slurry, then concentrate the slurry to the required concentration and then granulate or pulverize it. It is suitable for both medium and low-grade phosphate rocks, and also suitable for high-quality phosphate rocks. We...

Claims

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