Liquid/liquid extraction/purification of impure solutions of rare earth values
AssigneeRhone-Poulenc Specialites Chimiques
InventorsAlain Rollat, Jean-Louis Sabot, Michel Burgard, Thierry Delloye
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Abstract
Aqueous nitric solutions of salts of at least one rare earth, and containing contaminating amounts of at least one alkaline earth cation, e.g., calcium, barium and/or radium, are conveniently purified by liquid/liquid extracting same with an organic phase which comprises a polyether extractant for said at least one alkaline earth cation, e.g., a crown ether, and whereby said at least one alkaline earth cation is selectively transferred into said organic phase.
Claims32
A process for the purification of an aqueous nitric solution of salts of at least one rare earth, said solution containing contaminating amounts of at least one alkaline earth cation, comprising liquid/liquid extracting such aqueous nitric solution with an organic phase which comprises a polyether extractant for said at least one alkaline earth cation, and whereby said at least one alkaline earth cation is selectively transferred into said organic phase.
Dependencies are inferred from the claim text.