Advantages of molten salt processing for volume reduction of Cs-contaminated soil; Structure change of weathered biotite by the reaction with NaCl-CaCl mixed salt

Shimoyama, Iwao; Honda, Mitsunori; Kogure, Toshihiro*; Okamoto, Yoshihiro; Yaita, Tsuyoshi; Suzuki, Shinichi

no journal, , 

X-ray fluorescence (XRF) and X-ray diffraction (XRD) were employed to study bulk composition and structure changes of weathered biotite (WB) before and after low-pressure sublimation processing with NaCl-CaCl mixed salt. XRF showed that almost all Cs was desorbed from Cs-saturated WB after heating at 700 C under a low-pressure (14 Pa) and XRD showed that WB disappeared and augite appeared as the dominant product. We propose a new idea, Cs-free mineralization method, for reduction of Cs-contaminated soil in Fukushima based on these results.