Extracting columbium-tantalum values from pyrochlore ores

Details Extracting columbium-tantalum values from pyrochlore ores Extracting columbium-tantalum values from pyrochlore ores

1978-08-04

1980-01-08

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vb metal

423 62, 75101R, 75121, C01G 3300

Patent

active

041827449

ABSTRACT:
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 anywhere from above 2% to about 10% fluorine content by weight relative to the ore.

REFERENCES:
patent: 1905882 (1933-04-01), Balke
patent: 2880060 (1959-03-01), Campbell et al.
patent: 3025157 (1962-03-01), Lerner
patent: 3107976 (1963-10-01), Koerner et al.
patent: 3607006 (1971-09-01), Stambaugh

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