Process for the purification of solutions containing alkali metal carbonate, sulphate, hydroxide or possibly hydrogen carbonate, and one at least of the metals vanadium, uranium and molybdenum
A process is claimed for extracting molybdenum from aqueous solutions containing alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and, primarily, one at least of the metals belonging to the group formed by vanadium, uranium and molybdenum, in the form of alkali metal salts, and mineral and/or organic impurities. The said solutions result from an ore attack cycle and are taken off after extraction of the metal being sought, in the form of a concentrate. These said solutions are caustified by the addition of a suitable amount of lime, converting the carbonate present into alkali metal hydroxide. A first precipitate is separated from the alkali metal hydroxide-rich liquor, and the said liquor is concentrated until the alkali metal hydroxide content is at most equal to 50%, to cause the production of a second precipitate formed by alkali metal sulphate and molybdate, which is solubilized in an aqueous recycle liquor. The said re-dissolution liquor is then treated with sulphide ions and then acidified to give a pH-value of lower than 4.5, in order to quantitatively precipitate the molybdenum which is separated from the mother liquor, washed and dried for use as a source of molybdenum.
- Assignee:
- Aluminium Pechiney (France)
- Patent Number(s):
- US 4423013
- OSTI ID:
- 6800060
- Resource Relation:
- Patent Priority Date: Priority date 2 Apr 1980, France; Other Information: PAT-APPL-246405
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
MOLYBDENUM
DISSOLUTION
PRECIPITATION
SOLVENT EXTRACTION
PROCESS SOLUTIONS
DEMETALLIZATION
URANIUM
VANADIUM
ACIDIFICATION
ALKALI METAL COMPOUNDS
CARBONATES
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS RECOVERY
MOLYBDATES
PURIFICATION
SULFATES
URANIUM COMPOUNDS
URANIUM ORES
ACTINIDE COMPOUNDS
ACTINIDES
CARBON COMPOUNDS
DISPERSIONS
ELEMENTS
EXTRACTION
MANAGEMENT
METALS
MIXTURES
MOLYBDENUM COMPOUNDS
ORES
OXYGEN COMPOUNDS
PROCESSING
RECOVERY
SEPARATION PROCESSES
SOLUTIONS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
050400* - Nuclear Fuels- Feed Processing
400105 - Separation Procedures