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Report No.

Advantages of molten salt processing for volume reduction of Cs-contaminated soil; Structure change of weathered biotite by the reaction with NaCl-CaCl$$_{2}$$ mixed salt

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

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$$_{2}$$ mixed salt. XRF showed that almost all Cs was desorbed from Cs-saturated WB after heating at 700 $$^{circ}$$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.



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