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Report No.

Synergetic effects of chloride reactants and low-pressure environment for soil decontamination using cesium-free mineralization

Shimoyama, Iwao   ; Kogure, Toshihiro*; Okumura, Taiga*; Baba, Yuji  

Cs removal processes from soil largely depend on reagents and pressure in cesium free mineralization. We have proposed a hypothesis that monovalent cations remove Cs from clay minerals through ion exchange and divalent cations remove Cs through phase transformation of clay minerals based on results using CaCl$$_{2}$$ and KCl reagents. In this work, we used MgCl$$_{2}$$ and NaCl reagents to verify this hypothesis and studied decontamination ratio and structural change of mineral phase in soil. We found that the examination with these reagents supports our hypothesis, but both phase transformation and ion exchange were enhanced under low-pressure conditions. Because sea water includes NaCl and MgCl$$_{2}$$ as major components, we attempted to use sea water salt as a reagent and demonstrated that soil can be decontaminated by about 99% after heat treatment at 790 $$^{circ}$$C under low pressure conditions. This result indicates the processing cost of heat treatment can be decreased using cheap sea water.



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