2025 Volume 36 Pages 37-47
To treat decontamination equipment sludge generated from contaminated water at the Fukushima Daiichi Nuclear Power Station using alkali-activated materials (AAM), we solidified barium sulfate powder (BS) and potassium hexacyanocobalt(II)-ferrate(II) powder (FCN) with AAM, and investigated appropriate compositions that meet standards of properties. First, solidified bodies were produced while controlling the H2O/base ratio, Si/Al molar ratio, and Na/Si molar ratio. When the base materials consisted of metakaolin and blast-furnace slug, several appropriate compositions were identified, and two concentrations of solutions were found to produce solidified bodies that meet standards of properties. Next, using solutions with these concentrations, we produced solidified bodies while controlling the amounts of BS, BS+FCN, and H2O. The maximum usable amount of BS+FCN in appropriate compositions was greater than the maximum usable amount of BS when used alone.
