Recovery of hafnium values from loaded extraction solvent
Patent
·
OSTI ID:7008042
This patent describes an improvement in a process for recovering high purity hafnium hydroxide from a methyl isobutyl ketone organic solvent that is substantially free of sulfate ions and contains hafnium thiocyanate and thiocyanic acid. The improvement comprising reacting the organic solvent with ammonia to produce a reaction product in the form of a methyl isobutyl ketone organic solvent that is substantially free of sulfate ions and contains ammonium thiocyanite solution and hafnium hydroxide; separating the constituents of the reaction product in accordance with their respective specific gravities to produce a hafnium hydroxide sludge as one of the separation products; and removing the liquid component of the sludge to yield a high purity hafnium hydroxide ready for calcination to hafnium oxide.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA
- Patent Number(s):
- US 4873072
- Application Number:
- PPN: US 7240184A
- OSTI ID:
- 7008042
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CYANATES
EXTRACTION
HAFNIUM COMPOUNDS
HAFNIUM HYDROXIDES
HAFNIUM OXIDES
HYDROGEN COMPOUNDS
HYDROXIDES
KETONES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
OXIDES
OXYGEN COMPOUNDS
PRODUCTION
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
TRANSITION ELEMENT COMPOUNDS
360601* -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CYANATES
EXTRACTION
HAFNIUM COMPOUNDS
HAFNIUM HYDROXIDES
HAFNIUM OXIDES
HYDROGEN COMPOUNDS
HYDROXIDES
KETONES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
OXIDES
OXYGEN COMPOUNDS
PRODUCTION
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
TRANSITION ELEMENT COMPOUNDS