Process for obtaining molybdenum as a useful product from molybdeniferous solutions containing alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and possibly uranium
A process is claimed for obtaining molybdenum as a useful product from aqueous solutions to be purified, according to claim 1 of French patent No. 2,404,601, which contain, besides molybdenum, alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and which may also contain uranium, and inorganic and/or organic impurities. These solutions are treated at a temperature which is at most equal to the boiling temperature by means of lime to convert the alkali metal carbonate into hydroxide and to precipitate the insoluble calcium salts formed, then separating and washing the first precipitate which essentially contains calcium carbonate, from an alkali metal hydroxide-enriched liquor, which is concentrated by evaporation at the same time as the washing liquor of the first precipitate, to produce an alkali metal hydroxide content which is at most equal to 50%, to produce a second precipitate formed by a mixture of alkali metal molybdate and sulphate, characterized in that said solid mixture is dispersed in an acid aqueous liquor which is heated at from 120/sup 0/C to 250/sup 0/C under pressure to cause precipitation of anhydrous Mo0/sub 3/ which is subsequently separated from the mother liquor which essentially contains alkali metal sulphate.
- Assignee:
- Uranium Pechiney Ugine Kuhlmann (France)
- Patent Number(s):
- US 4432947
- Application Number:
- TRN: 84-014809
- OSTI ID:
- 6861164
- Resource Relation:
- Patent Priority Date: Priority date 31 Jul 1981, France; Other Information: PAT-APPL-398831
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
CHEMICAL COMPOSITION
PURIFICATION
MOLYBDENUM
PRECIPITATION
ACIDIFICATION
ALKALI METALS
CARBONATES
EVAPORATION
HEAT TREATMENTS
HIGH TEMPERATURE
IMPURITIES
LIMESTONE
MOLYBDENUM OXIDES
PRESSURE CONTROL
PROCESSING
REMOVAL
SODIUM HYDROXIDES
SULFATES
URANIUM ORES
WASHING
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATE ROCKS
CHALCOGENIDES
CLEANING
CONTROL
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
METALS
MIXTURES
MOLYBDENUM COMPOUNDS
ORES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
050400* - Nuclear Fuels- Feed Processing
400105 - Separation Procedures