Process for preparing phosphated or nitrophosphated fertilizers

Details Process for preparing phosphated or nitrophosphated fertilizers Process for preparing phosphated or nitrophosphated fertilizers

1991-08-15

1993-05-18

Lander, Ferris

Chemistry: fertilizers

Processes and products

Inorganic material

71 41, 71 43, 4231594, 423304, 423319, 423320, C05B 1108, C01B 2526

Patent

active

052117359

ABSTRACT:
The invention aims at a process for preparing phosphated or nitrophosphated fertilizers through reaction of phosphate rock in aqueous pulp, with sulfuric and/or phosphoric acids, with addition, or not, of ammonia, so as to produce fertilizers of the types simple, double or triple superphosphates, nitrogen-bearing (or not) phosphated partially acidulated, and superphosphated ammoniated, the product being adequate for use as a fertilizer, either powdered or slurried.
The invention allows for a more complete reaction due to the better contact between the liquid and solid reagents besides the complete utilization of the heat produced in the reaction as well as in the acid dilution in the aqueous medium, for the vaporization of the water present in the process.

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