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Li-K-Cd 합금을 이용한 LiCl-KCl 용융염에서 금속염화물의 제거
김가영,김택진,장준혁,김시형,이창화,이성재,Kim, Gha-Young,Kim, Tack-Jin,Jang, Junhyuk,Kim, Si-Hyung,Lee, Chang Hwa,Lee, Sung-Jai 한국방사성폐기물학회 2018 방사성폐기물학회지 Vol.16 No.3
Li-Cd 합금을 이용한 환원추출방식을 LiCl-KCl 기반의 drawdown 공정에 적용하게 되면, LiCl-KCl 공융염의 조성이 파괴되므로 공정온도를 높여야 하며, 전해정련 및 전해제련과 같은 공정에 LiCl-KCl 용융염을 재사용할 수 없게 된다. 따라서, 본 연구에서는 공융염 조성에 적합한 Li-K-Cd 합금을 제조하였으며, 이를 이용하여 U와 Nd가 포함된 LiCl-KCl 염에 투입하여 용융염 내 $UCl_3$의 제거가 가능한지 평가하였다.
440℃와 500℃에서 액체카드뮴음극을 이용한 우라늄 전착에 관한 연구
윤종호,김시형,김가영,김택진,안도희,백승우,Yoon, Jong-Ho,Kim, Si-Hyung,Kim, Gha-Young,Kim, Tack-Jin,Ahn, Do-Hee,Paek, Seungwoo 한국방사성폐기물학회 2013 방사성폐기물학회지 Vol.11 No.3
Electrowinning process in pyroprocessing recovers U (uranium) and TRU (Trans Uranium) elements simultaneously from spent fuels using a liquid cadmium cathode (LCC). When the solubility limit of U deposits over 2.35wt% in Cd, U dendrites were formed on the LCC surface during the electrodeposition at $500^{\circ}C$. Due to the high surface area of dendritic U, the deposits were not submerged into the liquid cadmium pool but grow out of the LCC crucible. Since the U dendrites act as a solid cathode, it prevents the co-deposition of U and TRUs. In this study, the electrodeposition of U onto a LCC was carried out at 440 and $500^{\circ}C$ to compare the morphology and component of U deposits. The U deposits at $440^{\circ}C$ have a specific shape and were stacked regularly at the center of the LCC pool, while the U dendrites (i.e., ${\alpha}$-phase) at $500^{\circ}C$ were grow out of the LCC crucible. Through the microscopic observation and XRD analysis, the electrodeposits at $440^{\circ}C$, which have a round shape, were identified as an intermetallic compound such as $UCd_{11}$. It can be concluded that the LCC electrowinning operation at $440^{\circ}C$ achieves the co-recovery of U and TRU without the formation of U dendrites.