Process for extracting tungsten from alkali metal tungstate solutions
This patent describes a process for extracting tungsten from an aqueous alkali tungstate solution by solvent extraction comprising the steps of: (a) extracting tungsten values into an organic extractant; (b) separating the loaded organic extractant from the aqueous solution containing a portion of the impurities; (c) stripping the loaded organic extractant from step (b) by contacting with an aqueous ammonia solution to form an aqueous ammonium tungstate solution and a stripped organic extractant; and feeding the stripped organic extractant to step (a) for use as the organic extractant. The improvement comprises removing the bromine compounds from the major portion of the stripped organic and thereafter using at least a portion of the resulting bromine free stripped organic to make up at least a portion of the organic extractant in step (a).
- Assignee:
- GTE Products Corp., Stamford, CT
- Patent Number(s):
- US 4759915
- OSTI ID:
- 7006704
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360100 -- Metals & Alloys
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ALKALI METALS
BROMINE COMPOUNDS
DISPERSIONS
ELEMENTS
EXTRACTION
HALOGEN COMPOUNDS
IMPURITIES
METALS
MIXTURES
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
TRANSITION ELEMENTS
TUNGSTEN