Process for the recovery of hydrofluoric acid and depositable re

Details Process for the recovery of hydrofluoric acid and depositable re Process for the recovery of hydrofluoric acid and depositable re

1980-07-01

1982-01-05

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vb metal

423 62, 423 64, 423484, 75101BE, 75121, C01G 3300, C01G 3500

Patent

active

043093892

ABSTRACT:
Raw materials containing tantalum or niobium are treated to obtain aqueous solutions containing fluoroacid complexes of niobium or tantalum. These solutions are decomposed by pyrolysis and calcined to obtain pure oxides of niobium or tantalum. The hydrofluoric acid separated during pyrohydrolysis is recovered and reused. A niobium or tantalum-free raffinate solution obtained, on extraction, with the above aqueous solutions contains dissolved metalloids which are recovered as oxides which are deposable waste products.

REFERENCES:
patent: 2816815 (1957-12-01), Ruhoff et al.
patent: 2950966 (1966-08-01), Foos
patent: 3117833 (1964-01-01), Pierret
patent: 3972710 (1976-08-01), Meyer
patent: 4065405 (1977-12-01), Hulme
patent: 4164417 (1979-08-01), Gustison

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