Removal of fluorine from phosphatic solutions

Details Removal of fluorine from phosphatic solutions Removal of fluorine from phosphatic solutions

1975-08-14

1977-10-11

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423309, 423321R, C01B 1516, C01B 2526, C01B 2516

Patent

active

040535614

ABSTRACT:
A method for removing fluoride ions from phosphoric acid by neutralizing said acid to a pH between about 5 and about 9, contacting the neutral salt solution thereby formed with an insoluble alkaline earth metal phosphate salt, and lowering the pH to convert the solution back to a purified acid.

REFERENCES:
patent: 2044940 (1936-06-01), Haag
patent: 3645682 (1972-02-01), Cochran
patent: 3872215 (1975-03-01), Cherdron et al.
patent: 3937783 (1976-02-01), Wamser et al.
Ionics Bulletin, L-2, 1963, p. 3.

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