Separation of rare earth values by liquid/liquid extraction
AssigneeRhone-Poulenc Specialties Chimiques
InventorsJean-Louis Sabot, Alain Rollat
Life of this patent
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Abstract
At least one rare earth value is selectively separated from at least one other rare earth value, by selectively liquid/liquid extracting an aqueous phase comprising the nitrates of said rare earth values with an organic phase which comprises an organic extractant, said organic extractant comprising at least one organophosphinic compound having one of the formulae (I) or (I'): ##STR1## wherein R.sub.1 and R.sub.2, which may be identical or different, are each substituted or unsubstituted alkyl, cycloalkyl, alkoxyalkyl or alkylcycloalkyl radicals, and X is either hydrogen or a cation.
Claims25
A process for separating at least one rare earth value from at least one other rare earth value, said values being contained in an aqueous solution comprising at least two rare earths, which process comprises liquid/liquid extracting an aqueous phase comprising at least two rare earth nitrates with an organic phase comprising an organic extractant, said organic extractant comprising at least one organophosphinic compound having one of the formulae (I) or (I'):
- ##STR3## wherein R.sub.1 and R.sub.2, which may be identical or different, are each substituted or unsubstituted alkyl, cycloalkyl, alkoxyalkyl, or alkylcycloalkyl radicals, and X is either hydrogen or a cation.
Dependencies are inferred from the claim text.