Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vb metal
Patent
1995-11-30
1997-06-03
Langel, Wayne
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vb metal
423 67, 423 68, 423592, 423593, C01G 3500
Patent
active
056351461
ABSTRACT:
A method is disclosed for the dissolution and purification of tantalum pentoxide. The impure tantalum pentoxide is reacted with a potassium-containing compound to form potassium tantalate. The potassium tantalate is optionally slurried with sulfuric acid and dissolved in an HF medium. The solution is suitable for purification by conventional ion exchange or solvent extraction methods. A potassium fluorotantalate precipitate may also be formed by adding KCl to the solution. The fluorotantalate precipitate may be further processed into a pure tantalum pentoxide by suspending the precipitate in an aqueous solution optionally containing a chelating agent and adding ammonium hydroxide to form ammonium tantalum oxide which can then be converted to tantalum pentoxide by calcining at high temperature.
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Miller Michael J.
Singh Raj P.
Clark Robert F.
Langel Wayne
Osram Sylvania Inc.
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