Separation of dissolved substances from wet process phosphoric acid
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United States of America Patent
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Feb 3, 1987
Grant Date -
N/A
app pub date -
Oct 22, 1985
filing date -
Oct 22, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for separating and removing substantial amounts of magnesium and other ion impurities from wet process phosphoric acid of 35-45% P.sub.2 O.sub.5 content is provided. The process steps comprise: (a) heating the acid while maintaining the acid at a concentration of 35-45% P.sub.2 O.sub.5 by the addition of water for a time sufficient to effect removal of silicon as fluosilicic acid and/or silicon tetrafluoride, thereby forming a stripped acid; (b) precipitating ralstonite from the heated stripped acid; and (c) separating the precipitated ralstonite from the acid.
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