Phosphoanhydrite process
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United States of America Patent
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Jun 5, 1984
Grant Date -
N/A
app pub date -
Dec 14, 1981
filing date -
Dec 14, 1981
priority date (Note) -
Expired
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Abstract
A wet process for producing phosphoric acid and phosphoanhydrite by acidulation of phosphate rock with a phosphoric acid/sulfuric acid mixture containing a very high recycle content of small sized anhydrite seed crystals. A strong phosphoric acid is obtained having a concentration of at least about 35% P.sub.2 O.sub.5. Further, the phosphoanhydrite may be readily converted to an industrially usable gypsum product.
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