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
A process for the purification of solutions containing sodium or potassium carbonate, sulphate, hydroxide or hydrogen carbonate, and mainly at least one of the metals belonging to the group formed by vanadium, uranium or molybdenum, in the form of sodium or potassium salts, and inorganic and/or organic impurities, wherein the above-mentioned solutions are completely or partially caustified by the addition of an adequate amount of lime, whereby a first precipitate essentially containing calcium carbonate is separated, and the separated liquor is concentrated by evaporation until the hydroxide content is at most equal to 50%, to cause the production of a second precipitate which essentially comprises sodium or potassium sulphate, then, after separation thereof, a hydroxide-rich liquor is collected. This process is more particularly adapted for treatments of liquors resulting from the alkaline attach of vanadiferous and uraniferous ores.
- Assignee:
- Pechiney, Lyon (France)
- Patent Number(s):
- US 4451439
- OSTI ID:
- 6419013
- Resource Relation:
- Patent Priority Date: Priority date 23 Nov 1981, France; Other Information: PAT-APPL-324060
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
CALCIUM
REMOVAL
PROCESS SOLUTIONS
PURIFICATION
SULFATES
AQUEOUS SOLUTIONS
IMPURITIES
MOLYBDENUM COMPOUNDS
ORE PROCESSING
POTASSIUM
POTASSIUM COMPOUNDS
PRECIPITATION
SODIUM
SODIUM COMPOUNDS
URANIUM COMPOUNDS
URANIUM ORES
VANADIUM COMPOUNDS
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METALS
DISPERSIONS
ELEMENTS
METALS
MIXTURES
ORES
OXYGEN COMPOUNDS
PROCESSING
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SOLUTIONS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400200* - Inorganic
Organic
& Physical Chemistry
050400 - Nuclear Fuels- Feed Processing