METHOD FOR SEPARATING ACTINIDES AND LANTHANIDES BY LIQUID-LIQUID EXTRACTION USING CALIXARENES

摘要

The invention concerns a method for separating actinides and lanthanides by liquid-liquid extraction using calixarenes. Said calixarenes correspond to formula (II) with R<1> and R<2> being alkyl or o-nitrophenoxyalkyl groups and R<3> and R<4> being aryl groups, and they are used in an organic liquid phase containing an organic diluent. The diluent and the calixarene concentration of the organic phase are selected so as to enrich the organic phase with actinide(s) and/or lanthanide(s) to be separated from an aqueous acid or saline solution.