Production of suspension fertilizers from wet-process orthophosp

Details Production of suspension fertilizers from wet-process orthophosp Production of suspension fertilizers from wet-process orthophosp

1977-01-28

1978-01-03

Hart, Charles N.

Chemistry: fertilizers

Processes and products

Inorganic material

71 43, 71 64C, 423313, C05B 700

Patent

active

040664325

ABSTRACT:
A process for preparing concentrated, high-grade, nitrogen-phosphate (N--P.sub.2 O.sub.5) base suspension fertilizer from wet-process or other impure orthophosphoric acids. The process involves a new procedure for the direct ammoniation of orthophosphoric acid in stages for production of fluid, high-analysis, N--P.sub.2 O.sub.5 suspension fertilizer with good physical properties. The new process contains a novel method for prevention of settling of crystals in the suspension during vibration, such as that which occurs during shipment. Settling is avoided by producing small, thin crystals of diammonium phosphate through control of the N:P.sub.2 O.sub.5 ratio and temperature in the second and third ammoniation stages.

REFERENCES:
patent: RE29149 (1977-03-01), Young
patent: T889024 (1971-08-01), Jones
patent: T900026 (1972-07-01), Jones
patent: 3813233 (1974-05-01), Kendrick, Jr.
patent: 3938982 (1976-02-01), Frangioni et al.

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