Abstract: EXTRACTION OF STRONIUM FROM HIGH-LEVEL ACTIVE WASTE WITH CROWN-ETHER Ⅲ．EXTRACTION OF STRONIUM WITH DICYCLOHEXYL-18-CROWN-6-OCTANOL-2HE LONGHAI；WENG XIMEI；YANG DAZHU；SONG CHONGLI（Institute of Nuclear Energy and Technology,TsingHua uniuersity, Beijing，102201）ABSTRACT The extraction of stronium by dicyclohexyl-18-crown-6-octanol-2 from nitric acid so-lutions is investigated．The effluences of the nitric acid，equilibrium time and stronium con-centration are studied．The results show that this extraction system has good dynamics，stronium concentration do not affect the distribution of stronium， water is a good strippingagent．The experiment of extraction stronium and another cation ion in.aqueous phase fromsynthetic HAW shows that this extraction system has high distribution of stronium and highseparation coefficient．This crown-ether-2-octanol extraction process can be used in recoveryof stronium from HAW. Key words Dicyclohexyl-18-crown-6-octanol-2 Stronium Extraction