Method for defluorinating wet process phosphoric acid
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United States of America Patent
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Mar 26, 1991
Grant Date -
N/A
app pub date -
May 11, 1990
filing date -
May 11, 1990
priority date (Note) -
Expired
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Abstract
A method for defluorinating wet process phosphoric acid. Phosphatic waste clay from phosphate rock beneficiation is mixed with the wet process phosphoric acid. The mixture is heated for a time sufficient to remove fluorine from the acid as gaseous silicon tetrafluoride. Phosphate is liberated from the phosphatic waste clay and thus is recovered in the defluorinated wet process phosphoric acid.
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