Process for preparing phosphated or nitrophosphated fertilizers through solubilization of phosphate rock
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United States of America Patent
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May 18, 1993
Issued Date -
N/A
app pub date -
Aug 15, 1991
filing date -
Apr 24, 1987
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Expired
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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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