Process for defluorinating alkali metal phosphate solutions

Details Process for defluorinating alkali metal phosphate solutions Process for defluorinating alkali metal phosphate solutions

1984-06-11

1986-11-04

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

423309, C01B 2516

Patent

active

046209662

ABSTRACT:
The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60.degree. to 120.degree. C. into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of particles of which more than 50% have a size of less than 8 .mu.m. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified alkali metal phosphate solution.

REFERENCES:
patent: 1456594 (1923-05-01), Howard
patent: 2053319 (1936-09-01), Block et al.
patent: 2271712 (1942-02-01), Pierce
patent: 3055733 (1962-09-01), Lang et al.

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