Manufacture of solid ammonium phosphate

Details Manufacture of solid ammonium phosphate Manufacture of solid ammonium phosphate

1975-09-02

1977-04-12

Thomas, Earl C.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423310, 71 43, C01B 1516, C01B 2528

Patent

active

040175880

ABSTRACT:
The invention relates to a process for the manufacture of solid monammonium phosphate with good granulation properties suitable for use in compound fertiliser manufacture. An improvement in product quality is obtained when between 20% and 80% of an aqueous slurry of ammonium phosphate, formed by the ammoniation of wet-process phosphoric acid, is mixed with a second acid prior to entry into a moisture disengagement unit. This treatment precipitates some monammonium phosphate crystals which provide nuclei for further crystal growth. After a short time delay to allow crystals to form, the remainder of the slurry is then added separately to the moisture disengagement unit.

REFERENCES:
patent: 3226184 (1965-12-01), Brownlie et al.
patent: 3313614 (1967-04-01), Sharples et al.

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