Removal of cationic impurities from inorganic solutions
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United States of America Patent
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Aug 29, 1989
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N/A
app pub date -
Aug 21, 1987
filing date -
Aug 21, 1987
priority date (Note) -
Expired
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Abstract
A process for the removal of cationic impurities from inorganic solutions and especially wet process phosphoric acid solutions wherein the solutions are passed through an ammonium ion or hydrogen ion charged cation exchange resin to remove various metal cations and thereafter the ion exchange resin is regenerated using an excess volume of ammonium sulfate solution which is subsequently treated to precipitate and filter out the cationic impurities so that the ammonium sulfate solution may be recycled for further ion exchange regeneration.
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