Membrane process for separating contaminant anions from aqueous solutions of valuable metal anions
An aqueous solution of at least one valuable oxyanion containing molybdenum, tungsten, vanadium, or uranium is refined to lower the content of contaminant anions such as PO/sub 4//sup -3/, SO/sub 4//sup -2/, NO/sub 3//sup -/, Cl/sup -/, ClO/sub 3//sup -/, and ClO/sub 4//sup -/, by subjecting the solution to electrolysis at a ph of from 0.5 to 4.0 between a cation-permselective membrane and an anion-permselective membrane having tertiary amine or quaternary ammonium anion exchange groups, to cause contaminant anions to pass from the solution into the anolyte. Ammonium molybdates, tungstates, vanadates, and uranates are formed from the thus-refined solution by subjecting it to a second stage of electrolysis at a ph of at least 7 between a cation-permselective membrane and an anion-permselective membrane to cause valuable oxyanions to pass from the solution into an anolyte which comprises an aqueous solution of ammonia and to form the desired ammonium compound.
- Assignee:
- Amax Inc
- Patent Number(s):
- US 4234393
- OSTI ID:
- 6630249
- Resource Relation:
- Patent File Date: Filed date 18 Apr 1979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MOLYBDENUM
MATERIALS RECOVERY
TUNGSTEN
URANIUM
VANADIUM
AQUEOUS SOLUTIONS
ELECTROLYSIS
ION EXCHANGE MATERIALS
ACTINIDES
DISPERSIONS
ELEMENTS
LYSIS
MANAGEMENT
MATERIALS
METALS
MIXTURES
PROCESSING
RECOVERY
REFRACTORY METALS
SOLUTIONS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management