セシウム固化体の浸出挙動および水熱安定性

概要

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Leaching behavior and surface alteration of the solid form products immobilizing Cs have been studied under hydrothermal conditions. Leached percentage of Si and Cs in distilled water at 90℃ increased with leaching time, while leaching rate gradually declined. The concentration of Al temporarily reached supersaturation and then markedly fell with leaching time, corresponding to the precipitation of Al-rich particles. Leached percentage of Cs in salt solutions at 200℃ was in the order of NaCl>>KCl>MgCl_2>>CaCl_2,and those of Si and Al were below 3%. A considerable alteration of solid form was observed in NaCl solution; precipitated layer, altered layer and reaction layer were built up on the surface. Leached percentage of Cs was found to be 0.14% in the coexisting system of equilibrated water/buffer・canister materials.Leaching behaviorHydrothermal stabilitySolid form productsCesiumSurface alterationLeached percentageLeaching timePrecipitationBuffer materialCanister material
東北大学の論文
1997-03-28