Abstract: A new prototype Φ 70 centrifugal extractor used in nuclear industry has been designed. The single stage mass transfer performance is studied. The single stage mass transfer performance of HNO 3 Nd 3+ and 30 %TRPO/kerosene system has been studied. The results show that the mass transfer efficiency is high. When the flow ratio is 1∶1 or 2∶1 and the rotor speed is 1 760～2 650 r/min, the total throughput changes within 40～200 L/h the mass transfer efficiency of Nd 3+ is over 90 %. The single stage mass transfer performance for simulated HLLW and 30 % TRPO/kerosene system has been studied. When the flow ratio is 2∶1 and the rotor speed ranges from 1 760 to 2 650 r/min and the total throughput changes within 30～150 L/h, the mass transfer efficiency is over 90 %. The results of stripping of Nd 3+ with 5.5 mol/L HNO 3 show that the stage mass transfer efficiency increases with decrease of total flow rate and increase of the rotor speed and is in the range of 83 %～93 % under the experimental conditions.