Production of suspension fertilizers from orthophosphoric acid
an improved process for production of concentrated high-analysis nitrogen-phosphate base suspension fertilizer by ammoniation of wet-process or other orthophosphoric acids in two stages. The process improvement involves the addition of a small amount (0.1-0.5 percent) of a crystal modifier, fluosilicic acid, for prevention of settling of crystals in the suspension during vibration such as that which occurs during shipment. With use of the crystal modifier, the monoammonium phosphate crystals formed are small and needlelike, and suspension fertilizers with excellent shipping, storage, and handling properties are produced with an N:P.sub.2 O.sub.5 weight ratio in the range of highest solubility, about 0.27 to 0.33.
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Description
Patent History
Patent number: T986001
Type: Grant
Filed: Oct 2, 1978
Date of Patent: Sep 4, 1979
Assignee: Tennessee Valley Authority
Inventors: Thomas M. Jones (Sheffield, AL), John M. Stinson (Sheffield, AL)
Application Number: 5/947,684
Type: Grant
Filed: Oct 2, 1978
Date of Patent: Sep 4, 1979
Assignee: Tennessee Valley Authority
Inventors: Thomas M. Jones (Sheffield, AL), John M. Stinson (Sheffield, AL)
Application Number: 5/947,684
Classifications
Current U.S. Class:
Acid Treatment (71/37);
Neutralization (71/43);
71/64C
International Classification: C05B 700;
International Classification: C05B 700;
