Process of removing cationic impurities from wet process phosphoric acid
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United States of America Patent
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Jan 27, 1987
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N/A
app pub date -
Dec 16, 1985
filing date -
Dec 16, 1985
priority date (Note) -
Expired
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Abstract
A method of removing aluminum, magnesium, iron and other impurities from wet process phosphoric acid is provided. The method comprises partially ammoniating the acid and reacting the acid with a fluoride ion donating compound to precipitate aluminum- and magnesium-containing ralstonite and ammonium fluorosilicate which can be easily separated from the acid thereby producing a partially ammoniated wet process phosphoric acid of reduced impurities content.
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