Recovery of hafnium values from loaded extraction solvent

Details Recovery of hafnium values from loaded extraction solvent Recovery of hafnium values from loaded extraction solvent

1988-09-02

1989-10-10

Stoll, Robert L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 70, 423DIG14, 210688, C01G 2702

Patent

active

048730726

ABSTRACT:
In the production of a highly pure hafnium oxide by calcination of a highly pure hafnium hydroxide, the production of a highly pure hafnium hydroxide from a hafnium-loaded, methyl isobutyl ketone solvent that is substantially free of zirconium and sulfate ions by adding ammonia to such solvent to produce a three-layered reaction product having MIBK solvent on top, ammonium thiocyanate solution in the middle, and a highly pure hafnium hydroxcide sludge at the bottom which is separately removed, freed of water, and calcined.

REFERENCES:
patent: 2938769 (1960-05-01), Overholser et al.
patent: 3006719 (1961-10-01), Miller
patent: 3069232 (1962-07-01), Greenberg et al.
patent: 3346330 (1967-06-01), de Calmes et al.
Stickney, William A., "Zirconium-Halfnium Separation", Bureau of Mines Report of Investigations 5499, 1959.

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