STUDY ON STRIPPING PLUTONIUM AND NEPTUNIUM BY (NH_4)_2CO_3 IN TRPO PROCESS

Technological conditions of stripping Pu(Ⅳ) and Np(Ⅳ) by (NH4)2CO3 in TRPO process are discussed.The influence of (NH4)2CO3 mass concentraction,temperature and U mass concentration in organic phase on the stripping rate is investigated.The countercurrent tube experiment using simulated high level liquid waste from power reactor is also carried out.In these experiments,Pu(Ⅳ) and Np(Ⅳ) can be stripped off from TRPO organic phase along with U by (NH4)2CO3 and no precipitation or interface filth occurs during stripping process.The distribution of other nuclides in HLLW is presented.