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Annular centrifugal extractors (ACEs) offer advantages including excellent hydraulic and mass-transfer performance,small hold-up volume,short residence time,and thus low solvent degradation,high nuclear criticality,easy start-up and shut-down,high compact structure.Therefore,ACEs have attracted increasing interest for future nuclear processing schemes,including the partitioning of high-level liquid waste (HLLW).Laboratory-scale and pilot-scale ACEs have been applied in demonstration tests of the trialkyl phosphine oxide (TRPO) process for HLLW partitioning.In this study,an industrial-scale ACE (260 mm in rotor diameter) with magnetic coupling and a "hanging" rotor structure was developed for the TRPO process.Moreover,a series of hydraulic and mass-transfer tests were carried out in the industrial-scale ACE.The maximum throughput can reach 10 m3/h under suitable operation parameters when kerosene is used as the organic phase,and water is used as the aqueous phase.The influence of the total flowrate,the flow ratio (aqueous/organic,A/O),and the rotor speed on the liquid hold-up volume was determined.The extraction stage efficiency is higher than 98％ under test parameters for extraction of Nd3+ and HNO3,using 30％ TRPO kerosene as the extractant from an HNO3 solution containing Nd.All results show good performance of the industrial-scale ACE for the TRPO process.