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Temperature dependent solid-liquid extraction (SLE) behavior of six rare earth elements (REs) was investigated using N-buty1 pyridinium hexafluorophosphate ([BPy]PF6) as an ionic liquid solvent and benzoyl acetone (HA) as an extractant at 80 ℃.Parameters including the amount of [BPy]PF6, HA concentration,extraction time, extraction temperature and pH were investigated and optimized.The extracted species was neutral REA(n-1)C1 (n-1 =3 or 2) in the REn+-[BPy]PF6-HA SLE system.The extraction percentage of REn+ could be 100% at stated pH and HA concentration.The recovery of REn+ extracted into [BPy]PF6 can be achieved using the mixture of 0.1 mol·L-1 C1CH2CO2H and 0.2 mol·L-1 HC1 as stripping agents.REs were extracted into solid ionic liquid phase with smaller volume and concentrated to some extent.Furthermore the temperature dependent SLE allows to recover [BPy]PF6 after the extraction procedures.These results indicate that the proposed procedure can be used for the preconcentration and separation of REs using [BPy]PF6 with high melting point.