Extraction of arsenic in solution in liquors containing alkali metal carbonate, sulphate and possibly hydroxide, and at least one of the metals vanadium, uranium and molybdenum
A process for extracting arsenic from aqueous solution to be purified, in accordance with claim 1 of U.S. Pat. No. 2,404,601, which also contains alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate, and which may also contain at least one of the metals vanadium, uranium and molybdenum, comprising causification of said solutions by means of lime to convert the carbonates into alkali metal hydroxides, followed by separation of an alkali metal hydroxide-enriched liquor and a first precipitate essentially containing calcium carbonate which is subjected to a washing operation, concentration by evaporation of the mixture of the washing liquor of the first precipitate to produce a second precipitate which essentially comprises alkali metal sulphate, which is characterized in that, before the aqueous solution is caustified, the aqueous solution is treated by a magnesium compound in an amount at least equal to the stoichiometric amount required to cause precipitation of magnesium arsenate.
- Assignee:
- Uranium Pechiney Ugine Kuhlmann (France)
- Patent Number(s):
- US 4495159
- OSTI ID:
- 5539566
- Resource Relation:
- Patent Priority Date: Priority date 16 Jul 1982, France; Other Information: PAT-APPL-398832
- Country of Publication:
- United States
- Language:
- English
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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
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
ARSENIC
REMOVAL
URANIUM CONCENTRATES
PRECIPITATION
PURIFICATION
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
ARSENATES
CARBONATES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
HYDROXIDES
LIMESTONE
MAGNESIUM
MAGNESIUM COMPOUNDS
MOLYBDENUM
SULFATES
URANIUM
VANADIUM
WASHING
ACTINIDES
ALKALINE EARTH METAL COMPOUNDS
ARSENIC COMPOUNDS
CARBON COMPOUNDS
CARBONATE ROCKS
CLEANING
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
METALS
MIXTURES
ORE CONCENTRATES
ORES
OXYGEN COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
SEMIMETALS
SEPARATION PROCESSES
SOLUTIONS
SULFUR COMPOUNDS
TRANSITION ELEMENTS
URANIUM ORES
050400* - Nuclear Fuels- Feed Processing