The basis examination for the processing of the salt waste (2)

Oxidation exchange treatment, chlorine is separated from salt wastes generated from dry reprocessing as a form hydrogen chloride by a reaction between salt waste and vapor at high temperature, was investigated for the purpose of adaptation of salt waste to the glassification. According to the last experiments, it has been clarified that the addition of boron oxide was effective to the oxidation exchange treatment of chloride. On the other hand, a phenomenon which chloride is evaporated by high temperature and effused from the treatment was occurred. Therefore, this phenomenon has been a problem for the practical adaptation. In this study, experiments attach importance to the oxidation exchange of cesium chloride, the fission products, were performed for the purposes of effective oxidation exchange treatment of chloride and evaporation reduction of chloride. As a result of this experiment, the evaporation reduction of chloride was confirmed by reconstructions of equipment such as a vessel for samples and a buffle plate. It has been clarified that nearly 100% of chloride could be separated from the salt waste by oxidation exchange treatment by addition of boron oxide, the oxidation stimulator, to a specimen of cesium chloride and a mixed specimen of sodium chloride and cesium chloride. Furthermore, some amount of cesium and sodium were remained in the vessel for the treatment and the evaporation of chloride was depressed. Hydrosodalite was applied in order to adsorb and remove hydrogen chloride from the treated specimen, however, the effects of its was unknown and there was a problem that chloride is regenerated by the thermal separation. (author)