Stabilized ammonium orthophosphate suspensions

Details Stabilized ammonium orthophosphate suspensions Stabilized ammonium orthophosphate suspensions

1989-08-28

1991-06-11

Langel, Wayne A.

Chemistry: fertilizers

Processes and products

Inorganic material

71 43, 71 6408, 423310, 423313, C01B 2528, C05B 700, C05B 1110

Patent

active

050229133

ABSTRACT:
An improved batch process for the production, in equipment readily available at the fertilizer dealer level, of high-analysis stable ammonium orthophosphate suspension fertilizers effected by the ammoniation of solid intermediates derived from wet-process orthophosphoric acids or combinations of the solid intermediates with such wet-process type acid or other impure phosphoric acids. Fluorosilicic acid, a by-product of the phosphate industry which is readily available and relatively inexpensive, is utilized as a source of fluoride. The fluorosilicic acid is added to the batch formulation prior to the ammoniation step thereby allowing the fluorosilicic acid to be converted to ammonium fluoride. Subsequently, the metallic impurities are allowed to precipitate as fluoride compounds instead of the usual troublesome impurity-phosphate-water gels which have been identified as causing complete destruction of suspension fluidity during storage. This specific sequencing of process steps produce suspensions which can be stored for substantial periods of time without becoming thixotropic and/or so thick that they have to be diluted before use as is the case in suspensions prepared by prior art procedures.

REFERENCES:
patent: 3813233 (1974-05-01), Kendrick
patent: 4066432 (1978-01-01), Jones
patent: 4137063 (1979-01-01), Sardisco
patent: 4375980 (1983-03-01), Jones et al.

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