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Effect of CaCl$$_{2}$$ and KCl additives on soil decontamination by cesium-free mineralization

Shimoyama, Iwao   ; Honda, Mitsunori   ; Kogure, Toshihiro*; Baba, Yuji  ; Yaita, Tsuyoshi; Okamoto, Yoshihiro  

We examined decontamination of radioactively contaminated soil in Fukushima using cesium free mineralization (CFM) with CaCl$$_{2}$$ or KCl additives. We analyzed radioactive concentration and structural changes of the samples using a NaI detector and an X-ray diffractometer. In the case of CaCl$$_{2}$$, decontamination ratio R$$_{d}$$ showed similar tendency for both air and low-pressure heating, and R$$_{d}$$ reached to 97% after heating at 790$$^{circ}$$C. X-ray diffraction (XRD) showed that transformation from clay minerals to other silicate minerals occurred by the heat treatments and products depend on the pressure condition during the heating. In the case of KCl, R$$_{d}$$ was higher for low-pressure heating than for air heating and reached to 83% at 790$$^{circ}$$C. XRD showed that clay minerals remained after the heating treatment. These results indicate that CFM is effective for decontamination of actual Fukushima soil and different mechanisms of Cs removal from contaminated soil exist for heating treatments with KCl and CaCl$$_{2}$$.

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