Separation of dissolved substances from wet process phosphoric a

Details Separation of dissolved substances from wet process phosphoric a Separation of dissolved substances from wet process phosphoric a

1985-10-22

1987-02-03

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423158, 423465, C01B 2516

Patent

active

046408282

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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