[3I01-05] Recovery of Cesium

[3I03] Recovery of Cs from Contaminated Soil by Subcritical Water Containing Metal Ions and Its Solidification using Inorganic Materials for Volume Reduction

(3)Mechanism of Enhanced Cs Desorption from Clay Minerals under Hydrothermal Condition

*Xiangbiao Yin¹, Nobutake Horiuchi², Takahiro Chikazawa², Asumi Ochiai³, Satoshi Utsunomiya³, Hideharu Takahashi¹, Yusuke Inaba¹, Toshihiko Ohnuki¹, Kenji Takeshita¹ (1. Tokyo Institute of Technology, 2. Mitsubishi Materials Corporation, 3. Kyushu University)

Keywords:Cesium desorpiton, Fukushima remediation, Decontamination, Clay minerals, Vermiculite

Relative large amounts of radioactive Cs contaminated soils have been generated and accumulated in Japan since the Fukushima nuclear accident. Therefore, decontamination of these soils and their volume reduction become very urgent issues. Herein, Cs desorption from typical clay minerals is systematically investigated by hydrothermal treatment with various solutions. It was found that Cs desorption was significantly strengthened by extraction with multivalent cations at higher temperature. On the basis of XRD and SEM-EDX analysis, mechanism of enhanced Cs removal from clay minerals was clarified.