Host: The Japan Society of Mechanical Engineers
Name : Proceedings of FDR2024 International Topical Workshop on Fukushima Decommissioning Research
Date : October 10, 2024 - October 13, 2024
Thermochemistry prevailing between gaseous CsOH and concrete main chemical phase CaCO3 at temperatures up to 570°C was investigated with various scenarios using the thermogravimetric method. The aim was to elucidate the decreasing behavior of cesium (Cs) trapping on CaCO3 observed in the transpiration method. A quasi-two-compartment platinum crucible was developed to realize co-measurements of both CsOH and CaCO3 during thermal treatment. Post-test X-ray diffraction was conducted to identify the chemical compound formed on the CaCO3 precursor. The early presence (timely sensitivity) of CsOH near the heated surface of CaCO3 was found to play a key role in the trapping (in the form of Cs2CO3). Such a factor is crucial because, otherwise, the Ca(OH)2 would predominate the surface upon CaCO3 decomposition, leading to no reaction with CsOH.
