STUDY ON EXTRACTION OF TRASURANIUM ELEMENTS AND Tc BY N,N,N′,N′-TETRAISOBUTYL-3-OXA-GLUTARIC AMIDE

The extraction of trasuranium elements and fission product Tc using N,N,N′,N′ tetraisobutyl 3 oxa glutaric amide(TiBOGA) has been investigated. The effects of acidity in aqueous phase and concentration of extractant have been studied. The distribution ratioes of Tc(Ⅶ), Am(Ⅲ) ,Np(Ⅳ),Np(Ⅴ),Pu(Ⅲ) and Pu(Ⅳ) are 2.25, >2 000, 43, 0.734, >2 000 and 34 respectively between 0.2 mol/L TiBOGA in 40 % octanol/kerosene and HLLW treated by TRPO process, the HNO 3 concentration in HLLW being 1 mol/L. The trasuranium elements and Tc(Ⅶ) in organic phase can be stripped completely by one or two step stripping with 0.6 mol/L H 2C 2O 4.