Process for dissolving tantalum/columbium materials containing alkali metal impurities
AssigneeCabot Corporation
InventorsRoger M. Bergman, Edwin J. Bielecki, Brian J. Higgins, Karl A. Romberger
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Abstract
Disclosed is a process for dissolving tantalum and/or columbium-containing materials contaminated with alkali metal impurities. The tantalum and columbium materials are digested in a solution comprising hydrofluoric acid and a fluosilicate-containing compound. The alkali metals are reacted to form precipitated fluosilicates, which then can readily be separated.
Claims18
A digestion process for the recovery of tantalum and/or columbium values, wherein the improvement comprises:
- dissolving tantalum and/or columbium-containing materials, contaminated with alkali metal impurities, in a hydrofluoric acid solution containing a fluorosilicate compound in an amount sufficient to react with said alkali metal impurities to precipitate alkali metal fluosilicates.
A process for dissolving tantalum and/or columbium-containing materials contaminated with alkali metal impurities comprising:
- dissolving the tantalum and/or columbium-containing materials in a hydrofluoric acid solution containing a fluosilicate compound in an amount sufficient to react with the alkali metal impurities to precipitate alkali metal fluosilicates.
Dependencies are inferred from the claim text.