Abstract: ELIMINATION OF THIRD PHASE WITH EDTA IN TRPO EXTRACTION PROCESSZhong Guangyi Jiao Rongzhou Liang Junfu(Institute of Nuclear Energy Technology,Tsinghua University,Beijing 102201)ABSTRACTIn the process of actinides extraction from China's present high level liquid waste(HLLW) by 30% TRPOkerosene,third phase is formed owing to substantial extraction of Fe(Ⅲ).The third phase can be eliminated by inhibiting extraction of Fe(Ⅲ) effectively with EDTA.In this way,rather high extraction coefficients of actinides can be maintained.Key words Third phase EDTA Fe(Ⅲ) Actinides HLLW