Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
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.
Stoll Robert L.
Stoltz R. A.
Westinghouse Electric Corp.
LandOfFree
Recovery of hafnium values from loaded extraction solvent does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recovery of hafnium values from loaded extraction solvent, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recovery of hafnium values from loaded extraction solvent will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1956344