Process for the extraction of arsenic from aqueous solutions containing alkali metal carbonate, sulfate and hydroxide or hydrogen carbonate and at least one metal including vanadium uranium and molybdenum
A process for extracting arsenic from aqueous solutions containing alkali metal carbonate, sulfate and hydroxide or hydrogen carbonate, at least one metal selected from the group consisting of vanadium, uranium and molybdenum in the form of an alkali metal salt, and inorganic and/or organic impurities comprises the steps of caustifying the solution with lime to convert the alkali metal carbonates into hydroxides to precipitate the insoluble calcium salts formed, concentrating the solution by evaporation of the effluent liquids originating from the caustification step to obtain a precipitate substantially comprising alkali metal sulfate. The caustification is performed in two steps consisting of treating the solutions with an amount of lime approximately equal to but less than the stoichiometric amount necessary to convert the alkali metal carbonates into hydroxides as a first precipitate, and after separating and washing the first precipitate, treating the resulting liquor with at least the stoichiometric amount of lime necessary to precipitate the arsenic in solution and the carbonate ions still present. The process is well adapted to the treatments of the liquors originating from the alkaline attack of uraniferous ore.
- Assignee:
- Uranium Pechiney Ugine Kuhlmann (France)
- Patent Number(s):
- US 4485075
- OSTI ID:
- 6012287
- Resource Relation:
- Patent Priority Date: Priority date 8 Apr 1982, France; Other Information: PAT-APPL-448854
- Country of Publication:
- United States
- Language:
- English
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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
Process for the purification of solutions containing a sodium or potassium carbonate, sulphate, and possibly hydroxide, and at least one of the metals vanadium, uranium and molybdenum
Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
ARSENIC
PRECIPITATION
WASTE WATER
MATERIALS RECOVERY
WATER TREATMENT
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBONATES
DEMETALLIZATION
EVAPORATION
HYDROXIDES
IMPURITIES
MOLYBDENUM COMPOUNDS
REMOVAL
SOLUTION MINING
SULFATES
URANIUM COMPOUNDS
URANIUM ORES
VANADIUM COMPOUNDS
ACTINIDE COMPOUNDS
CARBON COMPOUNDS
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
LIQUID WASTES
MANAGEMENT
MINING
MIXTURES
ORES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PROCESSING
RECOVERY
REFRACTORY METAL COMPOUNDS
SEMIMETALS
SEPARATION PROCESSES
SOLUTIONS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
WATER
052001* - Nuclear Fuels- Waste Processing
050400 - Nuclear Fuels- Feed Processing