DEHPA 추출제에 의한 모의폐액 내 MA / Ln 상호분리 연구 (Ⅰ) = Separation of Minor Actinides / Lanthanides in Simulated Radwaste Solution by DEHPA Extraction (Ⅰ)

다국어 초록 (Multilingual Abstract)

Separation of MA/Ln from a simulated solution was experimentally examined in sequence of the co-extraction with DEHPA, the first stripping with DTPA and the second stripping with HNO₃ in a batch system and a continuous system. As a result, it was found that the optimum conditions were 0.1M HNO₃, 1M DEHPA/n-dodecane, and O/A=1 for the co-extraction step, 0.05M DTPA/1.5M lactic acid, pH=3.5, and O/A=1 for the first stripping and 6M HNO₃, O/A=5 for the second stripping in the batch system, respectively. Also, it was found that 99.9％ of Am and Eu was co-extracted by the first MX, and 82％ Am and 7％ Eu were co-stripped by the second MX, in the continuous system, respectively. These results satisfied the requirements established in this study, except for the first stripping of MA with DTPA. Further investigation will be continued in order to advance the recovery yield of MA with DTPA.