Purification of wet process phosphoric acid

Details Purification of wet process phosphoric acid Purification of wet process phosphoric acid

1979-04-10

1981-10-20

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

23307, 159 17R, 159 29, 423321R, C01B 2540, C01B 2516, B01D 100

Patent

active

042960827

ABSTRACT:
Wet process phosphoric acid is heated by passing alternating current through the acid, preferably in carbon apparatus to concentrations above 76% P.sub.2 O.sub.5 and preferably temperatures above 500.degree. C. to remove sulphate and fluoride and convert organic and basic impurities into a filterable precipitate; the acid is separated from the precipitate preferably after dilution with water to provide a high purity crystallizable product.

REFERENCES:
patent: 4048289 (1977-09-01), Pierres
patent: 4215098 (1980-07-01), Lowe et al.

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