Process for obtaining molybdenum as a useful product from molybdeniferous solutions containing alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and possibly uranium

Patent · Tue Feb 21 04:00:00 EST 1984

OSTI ID:6861164

Maurel, P

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
• OSTI ID: 6861164
• Country of Publication: United States
• Language: English

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ACIDIFICATION
ALKALI METAL COMPOUNDS
ALKALI METALS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL COMPOSITION
CLEANING
CONTROL
DISPERSIONS
ELEMENTS
EVAPORATION
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROXIDES
IMPURITIES
LIMESTONE
METALS
MIXTURES
MOLYBDENUM
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
ORES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRECIPITATION
PRESSURE CONTROL
PROCESSING
PURIFICATION
REMOVAL
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUTIONS
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
URANIUM ORES
WASHING