Technology on Re-extraction of U,Np and Pu by Hydrazine Carbonate in TRPO Process

Hydrazine carbonatewas synthesized with carbon dioxide and hydrazine(hydrate.) The technological conditions of re-extraction of U,Pu and Np loaded in(30%TRPO/OK) by hydrazine carbonate were studied.The effects ofequilibrium time,hydrazine carbonateconcentration and loading U concentration in organic phase on re-extraction rate were investigated.The countercurrenttube experiments using simulated high-level liquid waste from power reactor fuel reprocess were carried out. The results show that the re-(extraction) rates of U and Pu are above 99% by 100 g/L hydrazine carbonatesolution in 3-stage countercurrent experiments.No precipitation or interface filth occurs during re-extraction process.By adding HNO_(3)to the re-extracted aqueous solution and heating up, the hydrazine can be decomposed completely and the re-extraction process becomes salt free.