Process for the preparation of ultrapure active metal fluorides
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United States of America Patent
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Jun 21, 1988
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N/A
app pub date -
Dec 27, 1984
filing date -
Dec 27, 1984
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Expired
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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 fluoride compound in the gas phase for a predetermined period of time to further increase anion purity.
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