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Uranium (VI) recovery process using acid organophosphorus extractant containing two or four alkoxyalkyl or aryloxyalkyl radicals

Patent ·
OSTI ID:7036650
; ;

A process is claimed for the recovery of uranium (VI) present in a phosphoric acid solution by contacting the latter with an organic solvent able to extract uranium. The organic solvent comprises a system of extractants constituted by a neutral phosphine oxide and an acid organophosphorus compound. The process comprises a re-extraction stage for the uranium extracted in the organic solvent, said re-extraction stage being performed in a re-extraction apparatus comprising at least two stages in which the uranium-containing organic solvent is circulated in the said stages by introducing it into the first stage, an aqueous ammonium carbonate solution is circulated in countercurrent with respect to the organic solvent in the said stages by introducing it into the final stage in a quantity such that it represents 50 to 80% of the stoichiometric quantity necessary for neutralizing the acid organophosphorus compound and for transforming the uranium present in the organic solvent into uranyl ammonium tricarbonate, ammonia being added in the form of a gas or an aqueous solution to the ammonium carbonate solution circulating in the first stage in order to keep the pH of the final stage as a value between 8 and 9.5 and preferably between 8 and 8.5.

Assignee:
Commissariat a l'Energie Atomique (France)
Patent Number(s):
US 4432946
OSTI ID:
7036650
Country of Publication:
United States
Language:
English

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Related Subjects

050400* -- Nuclear Fuels-- Feed Processing
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
ACTINIDE COMPOUNDS
ACTINIDES
AMMONIA
AMMONIUM CARBONATES
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
DISPERSIONS
ELEMENTS
EXTRACTION
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MIXTURES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANOPHOSPHINIC ACIDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOSPHINES
PHOSPHORIC ACID
PHOSPHORUS COMPOUNDS
RECOVERY
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENTS
URANIUM
URANIUM COMPOUNDS
URANYL COMPOUNDS