Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : June 29, 2016 - July 01, 2016
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.
