Process for making stable sludge-free ammonium polyphosphate fer

Details Process for making stable sludge-free ammonium polyphosphate fer Process for making stable sludge-free ammonium polyphosphate fer

1975-01-30

1976-10-26

Hart, Charles N.

Chemistry: fertilizers

Processes and products

Inorganic material

71 43, 71 64C, 423310, 423313, 423315, C05B 700

Patent

active

039881407

ABSTRACT:
Stable sludge-free ammonium polyphosphate fertilizer solution is prepared by introducing ammonia and a blend of impure wet process phosphoric acid having a P.sub.2 O.sub.5 content of 58 to 68% and solvent extracted wet process phosphoric acid of reduced Fe.sub.2 O.sub.3, Al.sub.2 O.sub.3, MgO and free H.sub.2 O content into a reactor wherein the mixed reactants are retained for at least about 0.10 second after which the reaction product is immediately quenched and the resulting solution aged to effect precipitation and nucleation of suspended insoluble metallic phosphates and insoluble organic matter, and filtered.

REFERENCES:
patent: 3264087 (1966-08-01), Slack et al.
patent: 3734708 (1973-05-01), Burns

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