Metallic ion removal from phosphoric acid

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

1978-10-25

1981-01-06

Langel, Wayne A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423126, 423163, 423321R, C01B 2518

Patent

active

042436435

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 magnesium-containing precipitate. A preferred precipitant is one containing calcium flouride, such as the sludge obtained by treating pond water from a phosphoric acid plant with a calcium-containing compound. Preferably, the soluble sulfate content of the phosphoric acid is maintained at at least about 2% by weight. An animal feed can be prepared from the precipitate by combining the precipitate with phosphate rock, water, and a sodium-containing compound, and then calcining the combination.

REFERENCES:
patent: 4136199 (1979-01-01), Mills

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