PROCESS FOR DISSOLVING TANTALUM/COLUMBIUM MATERIALS CONTAINING ALKALI METAL IMPURITIES

摘要

PROCESS FOR DISSOLVING TANTALUM/COLUMBIUM MATERIALS CONTAINING ALKALI METAL IMPURITIES 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.