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Selective uptake and recovery of Cs, Pd, Re and Mo from simulated high level radioactive liquid waste solution by column loaded with hybrid microcapsules

ハイブリッドマイクロカプセル充填カラムによる模擬高レベル放射性廃液からのCs, Pd, Re及びMoの選択的分離・回収

大西 貴士  ; 大林 弘 ; 小山 真一  ; 三村 均*

Onishi, Takashi; Obayashi, Hiroshi; Koyama, Shinichi; Mimura, Hitoshi*

ハイブリッドマイクロカプセルとは、金属イオン抽出剤をアルギネートゲルポリマーなどの担体で内包した粒状物質であり、革新的核種分離システムへの適用を検討している。マイクロカプセルが優れた吸着特性を有することは、既にコールド試験により明らかになっている。本試験では、高速実験炉「常陽」で照射した燃料より、模擬高レベル放射性廃液を調製し、それぞれCs$$^{+}$$, Pd$$^{2+}$$, ReO$$_{4}$$$$^{-}$$及びMoO$$_{4}$$$$^{2-}$$を回収対象とした7種類のマイクロカプセルを用いて、バッチ方式での吸着試験及びカラム方式での吸着・溶離試験を実施し、照射済燃料溶解液中においても、マイクロカプセルが優れた吸着・溶離特性を示すことを明らかにした。

Hybrid microcapsule (MCs) is composed of carrier matrix and extractants and form granulated composite, so that it is suitable for the practical column operation. Previous studies revealed the uptake behaviors of various metal ions on MCs. In this study, the selective uptake and recovery from simulated high level radioactive liquid waste solution (HLLW) were examined. Firstly, the uptake experiments of Cs, Pd, Re substitute for Tc and Mo were carried out by batch method using seven kinds of MCs. As a result, the uptake rates for all MCs were more than 96.9 %. Secondly, the column separation experiments were conducted with four MCs for the separation of Cs, Pd, Re and Mo, respectively. The results indicate the strong affinity of Cs, Pd and Re on each microcapsule, and it is demonstrated that the selective uptake and recovery from simulated HLLW by column method with MCs, and their availability was revealed for the treatment of HLLW.

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