Metallic ion removal from phosphoric acid

Details Metallic ion removal from phosphoric acid Metallic ion removal from phosphoric acid

1977-06-27

1979-01-23

Carter, Herbert T.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423126, 423163, 423317, C01B 2518

Patent

active

041361997

ABSTRACT:
Metal ion impurities are removed from phosphoric acid by adding to the acid a precipitant comprising ions of calcium and fluorine to cause precipitation of a fluoride solid which contains ions of magnesium, and other metals (e.g., Al, N.sub.a) which were in the impure acid. A preferred precipitant comprises calcium fluoride, such as the sludge obtained by treating pond water from a phosphoric acid plant with calcium ions (e.g. lime and/or limestone).

REFERENCES:
patent: 3124419 (1964-03-01), German et al.
patent: 3206282 (1965-09-01), Crawford et al.
patent: 3379501 (1968-04-01), Treitler et al.
patent: 3442609 (1969-05-01), Carothers et al.
patent: 3494736 (1970-02-01), Carothers et al.
patent: 4028237 (1977-06-01), Nishimura et al.

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