溶融技術による除染廃棄物焼却残さからのセシウムの熱分離に関する研究

抄録

Melting technique is one of useful separation treatments at a high temperature of 1300-1400ºC. Using the technique, Cs can be volatilized from different solid samples in the melting furnace. In this study, we conducted a laboratory-scale melting test to investigate the radioactive Cs separation performance for decontamination of incineration ash (bottom ash, fly ash and the mixture) from off-site decontamination activity. As a result, regardless of sample type, radioactive Cs volatilization ratio increased by the addition of CaCl₂. Furthermore, the higher the basicity of molten slag in the presence of Ca(OH)₂ was, the higher the volatilization ratio became. The addition of CaCl₂ and Ca(OH)₂ resulted in Cs volatilization ratio of more than 99%. Therefore, we found that this melting technique can be effective even for decontamination of incineration ash from the off-site cleaning.