Method of extracting columbium-tantalum values from...

Details Method of extracting columbium-tantalum values from... Method of extracting columbium-tantalum values from...

C - Chemistry, Metallurgy

22

B

53/143

C22B 34/24 (2006.01) C01G 33/00 (2006.01)

Patent

CA 1122416

IMPROVED METHOD OF EXTRACTING COLUMBIUM-TANTALUM VALUES FROM PYROCHLORE ORES ABSTRACT OF THE DISCLOSURE A method of extracting high purity columbium oxide, also known as niobium oxide, from barium-rich pyrochlore ores by treating the ore with a calcium salt, such as, calcium chloride, fusing the ore with caustic soda and a fluorine containing compound, and subsequently acid leaching the fused mass; and from calcium-rich pyrochlore ores by fusing the ore with caustic soda and a fluorine containing compound, and subsequently acid leaching the fused mass. The amount of fluorine containing-compound used should contain from above 2% to about 10% fluorine content by weight relative to the ore.

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