Process for the preparation of crystalline potassium tantalum fl

Details Process for the preparation of crystalline potassium tantalum fl Process for the preparation of crystalline potassium tantalum fl

1976-07-21

1977-08-09

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Plural metal or metal and ammonium containing

423 63, 4236585, C01B 908, C01G 3500, C01D 302

Patent

active

040411389

ABSTRACT:
Potassium tantalum fluoride substantially free from compounds of silicon and niobium is prepared from a crude tantalum-niobium salt solution by use of aqueous hydrofluoric acid having a dissolved content of a silicon compound by mixing the salt solution with a water-insoluble organic solvent for said salts; extracting the organic phase with aqueous medium; mixing the organic phase with silicon-contaminated aqueous hydrofluoric acid; mixing the organic phase with a hot silicon-free solution of an ionizable potassium compound, and separating and cooling the aqueous phase thereby precipitating potassium tantalum fluoride. The phases are separated between steps.

REFERENCES:
patent: 2795481 (1957-06-01), Hicks et al.
patent: 2962372 (1960-11-01), Foos et al.
patent: 2998298 (1961-08-01), Scheller
patent: 3051547 (1962-08-01), Bialecki
patent: 3065046 (1962-11-01), Foos et al.
patent: 3653850 (1972-04-01), Eberts
patent: 3907976 (1975-09-01), Hogan, Jr. et al.

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