Transfer Kinetics of Metals from Molten Fission Product Chloride to Liquid Lead Cathode during Electrolysis in Pyrometallurgical Treatment of Highly Radioactive Waste
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It is sought to describe the interphase transfer kinetics governing the electrolytic reduction of chloride salt mixtures in the process performed for the purpose of recovering alkali, alkaline earth and rare earth metals from the salt mixture containing fission products generated during pyrometallurgical processing of highly radioactive waste from the Purex process of spent fuel. Data for analyzing the two-phase transfer kinetics of the metals of interest are acquired on simulated chloride mixtures submitted to experimental electrolysis in a system comprising anode immersed in molten salt mixture and cathode of liquid lead. Approximating the concentrations of individual metals remaining in the mixture as exponential functions of the duration of electrolysis, the apparent overall transfer coefficients of the metals in reductive reaction are estimated to range from 1.5×10<SUP>-6</SUP> to 3.8×10<SUP>-5</SUP>m/s. The metal ions prove to rank in descending order of transfer coefficient: Eu<SUP>3+</SUP>>Ba<SUP>2+</SUP>>Sr<SUP>2+</SUP>>Na<SUP>+</SUP>>Li<SUP>+</SUP>>K<SUP>+</SUP>>Cs<SUP>+</SUP>, thus indicating the likely effect of ionic valence influencing the interphanse transfer of metals.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 33(3), p.245-249, 1996-03-25
Atomic Energy Society of Japan