Purification of ammonium fluoride solutions

Details Purification of ammonium fluoride solutions Purification of ammonium fluoride solutions

1978-11-13

1980-04-29

Hearn, Brian E.

Chemistry of inorganic compounds

Halogen or compound thereof

Ammonium halide

423143, 423339, 423465, C01C 116

Patent

active

042006228

ABSTRACT:
In the purification of an ammonium fluoride solution containing silicic acid by adding iron (III) ions and precipitating the iron (III) ions at a pH above 8.5 and a concentration of free ammonia in the solution of more than about 1% by weight, the silicic acid being carried with the iron (III) ion precipitate, the improvement which comprises adding the iron (III) ions to the ammonium fluoride solution at a temperature below about 30.degree. C. and, before removal of the precipitate, to the solution a salt of at least one of the alkali metals, alkaline earth metals, zinc, aluminum and lead in such quantity that the solution becomes saturated with such salt.

REFERENCES:
patent: 2981597 (1961-04-01), Tarbutton
patent: 3201193 (1965-08-01), Baumann
patent: 3563699 (1971-02-01), Cuneo
patent: 3755546 (1973-08-01), Lichtstein
patent: 4057614 (1977-11-01), Ono
Smith, The Sequestration of Metals, Chapman & Hall Ltd., London (1959) pp. 78.

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