Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Robert G. Mendenhall0
Raj P. Singh Gaur0
Date of Patent
February 27, 2007
0Patent Application Number
107092190
Date Filed
April 22, 2004
0Patent Primary Examiner
Patent abstract
A method for the dissolution and purification of tantalum ore and synthetic concentrates is described. The method preferably uses ammonium bifluoride as the fluoride source in place of the hydrofluoric acid used in the conventional methods. Other fluoride compounds such as NaF, KF, and CaF2 may be used alone or in combination with ammonium bifluoride. The tantalum concentrate and fluoride source are combined with sulfuric acid to form a solution containing tantalum values and impurities. The tantalum values are then separated from the impurities by solvent extraction.
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