Granulated nitrogen-phosphorus-potassium-sulfur fertilizer from

Details Granulated nitrogen-phosphorus-potassium-sulfur fertilizer from Granulated nitrogen-phosphorus-potassium-sulfur fertilizer from

1982-10-25

1992-10-27

Pal, Asok

Chemistry: fertilizers

Processes and products

Organic material-containing

71 34, 71 36, 71 43, 71 51, 71 53, C05F 700, C05F 1100

Patent

active

051585944

ABSTRACT:
Process for converting phospho-gypsum waste product from the wet process of manufacturing phosphoric acid from phosphate rock by ammoniating said product at a pH of 6.5 or less and adjusting the phosphorus and potassium values of said ammoniated product by addition of one or more sources of potassium and phosphorus.

REFERENCES:
patent: 1122183 (1914-12-01), Willson et al.
patent: 1761400 (1930-06-01), Liljenroth
patent: 2913329 (1959-11-01), Geiersherger
patent: 3475153 (1969-10-01), Abbott et al.
patent: 3595610 (1971-07-01), Brinkman et al.
patent: 4007030 (1977-02-01), Schroeder et al.
patent: 4312842 (1982-01-01), Wilson, Sr. et al.
patent: 4393032 (1983-07-01), Drechset et al.
patent: 4462972 (1984-07-01), Satterwhite

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