Recent Progress on Chemical Species of Uranium in Molten Chlorides

High-temperature molten salt electrolysis based pyrochemical reprocessing of spent nuclear fuel has certain advantages for advanced nuclear fuel cycle, which is usually carried out in a high-temperature chloride molten salt system, and actinides (Ans) are recovered and separated over lanthanides (Lns) via electrolysis in molten salt. Among them, the separation and recovery of uranium from fission products (FPs) is one of the key tasks. To optimize the separation process, it is necessary to deeply understand the relationship between electrochemical properties and chemical species of uranium in molten salt. Hence, it is very important to carry out the study of the chemical species of uranium in molten chlorides. In this review, the research progresses on chemical species of uranium in molten chlorides have been summarized and sorted. In addition, future perspectives upon actinide chemical species in molten salt have been given.