Abstract: STUDIES ON REMOVING ACTINIDES FROM HLLW WITH TRPO──THE INACTIVE EXPERIMENT USING CENTRIFUGAL CONTACTORS FOR SEPARATIONWang Jianchen;Liu Bingren;Song Chongli;Tang Wencheng(Institute of Nuclear Energy Technology, Tsinghua University, P. O. Box 1021,Beijing 102201)Abstract:The inactive experiment of removing actinides from simulated HLLW by TRPO process is completed. When the simulated HLLW is three times diluted and HNO_3 concentration is adjusted to 1.0mol/l, 99.9％ of Zr and Nd (simulate Np, Pu and Am ) are removed from the simulated HLLW with twelve extraction stages and four scrub stages. 60% of Fe extracted into the organic phase is scrubbed out, so that the entering of too much Fe into the following step is avoided. Nd and Zr are separated into two groups by stripping with concentrated nitric acid and oxalic acid.The cross contamination between them is small. The concentration profile of nitric acid, Nd, Zr,etc. in various stages and their distribution in different process stream solutions are presented.Keywords: Trialkylpiosphine oxide Extraction High-level liquid waste Actinides