Process for the preparation of ultrapure heavy metal fluorides

Details Process for the preparation of ultrapure heavy metal fluorides Process for the preparation of ultrapure heavy metal fluorides

1987-10-15

1989-08-15

Doll, John

Chemistry of inorganic compounds

Halogen or compound thereof

Binary fluorine containing compound

C01B 908, C01G 2116

Patent

active

048572934

ABSTRACT:
This invention provides a method for the preparation of ultrapure active metal fluorides of increased purity from their metal oxides by reacting an active metal with a predetermined amount of HF(aq) to form a solid reaction product which is dried under controlled heating to form a hydrated fluoride. This hydrated active metal fluoride is then subjected to reactive atmosphere processing comprising hydrofluoric acid vapor in a CO.sub.2 reactive carrier gas and a selected halide compound in the gas phase for a predetermined period of time to further increase anion purity.

REFERENCES:
Handbook of Preparative Inorganic Chemistry, 2nd ed., Braver, ed. Academic Press, 1963, vol. 1, p. 150.
Chemistry of the Elements, Greenwood and Earnshaw, Pergamon Press, 1984, pp. 958-959.

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