[2B09-13] Metal fuel pyroprocessing

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[2B13] Development of spent salt treatment technology using zeolite(9) Modeling of influence of coexisting rare earth elements on adsorption behavior of alkaline-earth elements in zeolite

*Koichi Uozumi¹, Kenta Inagaki¹, Hirohide Kofuji² (1. CRIEPI, 2. JAEA)

Keywords:

Pyroprocessing,Spent salt treatment,Zeolite,Strontium,Cerium

Zeolite immersion tests exhibited that Sr, once adsorbed onto zeolite, is released into salt along with adsorption of Ce present in salt. To understand this behavior, a model was constructed in which amount of Sr adsorbed onto zeolite decreases when amount of Ce adsorbed onto zeolite reaches a certain threshold. Here, this threshold was determined by fitting to experimental results.As a result, a threshold that can reproduce test results for both high and low concentrations of Ce and Sr in the salt was found. In both cases, the decrease in Sr adsorption was slower in experiments than in calculations, suggesting that opposite directions of adsorption of Ce and release of Sr resulted in the slower release rate of Sr.