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The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and benzoyl acetone (HA) as extractant.The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HA.When sufficient HA was included in IL phase, the extraction percentage of RE3+ could be higher than 98%.