Behavior of Molybdenum Chloro-Spccics in Alkali Chloride-Based Melts: Implications for Spent Nuclear Fuel Treatments

摘要

Chloro-species of molybdenum in oxidation states (Ⅲ ), (Ⅳ) and (Ⅴ) were studied in a range of alkali chloride melts employing high temperature electronic absorption spectroscopy. The reaction rates of disproportionation of MoCl_6~(3+) complex ions in various melts between 550 and 750 °C were determined. Mo(Ⅳ) species MoCl_6~(2-) were generated and thermodynamic properties of Mo(Ⅳ) chloride in NaCl-CsCl eutectic melt estimated. Absorption spectra of molybdenum(Ⅴ) MoCl_6~- were measured in a chloride melt for the first time. Speciation and behavior of molybdenum is required for designing processes for molten salt reprocessing of spent nuclear fuel (SNF).