Process for removing impurities from wet process of phosphoric acid
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United States of America Patent
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Feb 19, 1985
Grant Date -
N/A
app pub date -
Jun 28, 1983
filing date -
Jun 28, 1983
priority date (Note) -
Expired
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Abstract
A method of preparing a purified ammoniated phosphoric acid composition, comprising, reacting an aqueous wet process phosphoric acid with an ammonium ion source at a N/P.sub.2 O.sub.5 weight ratio ranging from about 0.06 to about 0.15 in the presence of solid phase metal ion containing impurities for a time sufficient to precipitate the majority of the impurities in the acid, the impurity precipitation comprising at least several complex metal salts at least one of which contains magnesium, aluminum and fluorine, and obtaining the purified ammoniated phosphoric acid by separating the precipitated impurities therefrom.
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