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In the dry reprocessing process for the spent nuclear fuels by the oxide electro-winning method, the oxygen ion exists in the molten NaCl-2CsCl due to oxygen gas purging of the melt for the MOX electrolysis deposition. It is thought that this oxygen ion influences the chemical form of rare earth ions in the molten NaCl-2CsCl, however the reaction behaviors of these rare earth ions with the oxygen ion has not been understood well. In this study, dry air was purged into the molten NaCl-2CsCl containing SmCl3 at 923K, and the behavior of Sm3+ in the melt was measured by the spectrophotometry and the differential pulse voltammetry. It was confirmed to generate the samarium oxychloride, SmOCl, by the reaction between H2O in air purging reacted and SmCl3 in the molten NaCl2CsCl. The amount of SmOCl generated increased with the amount of H2O in air, and 37.5% of the amount of H2O was consumed to generate SmOCl in this experiment.

Behavior of Sm3+ in NaCl-2CsCl Molten Salt by Air Purging