Granulated nitrogen-phosphorus-potassium-sulfur fertilizer from waste gypsum slurry
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United States of America Patent
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Oct 27, 1992
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N/A
app pub date -
Oct 25, 1982
filing date -
Oct 25, 1982
priority date (Note) -
Expired
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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.
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