Study on the condensation behavior of the key metal fluorides in molten salts during low-pressure distillation

• Published in: Hé jìshū Vol. 47; no. 1; pp. 49 - 55
• Main Authors: HUO Yuting, LUO Yan, XIANG Haifei, DOU Qiang, MA Jie, WENG Hongmeng, LI Qingnuan
• Format: Journal Article
• Language: Chinese
• Published: Science Press 01.01.2024
• Subjects: 233paf5; condensation behavior; flibezr; key metal fluorides; low-pressure distillation
• ISSN: 0253-3219
• DOI: 10.11889/j.0253-3219.2024.hjs.47.010301

BackgroundIn thorium-based molten salt reactors (TMSRs), 233Pa is an important intermediate nuclide in the conversion chain of 232Th to 233U, and 233PaF5 can be effectively separated from carrier salt by low-pressure distillation. However, some of the metal fluoride is vaporized along with 233PaF5 simultaneously, and the evaporated fluoride may condense at different temperatures.PurposeThis study aims to investigate the condensation behavior of 233PaF5 and other key metal fluorides in the FLiBeZr molten salt during the low-pressure distillation process.MethodThe FLiBeZr molten salt containing PaF5 and various metal fluorides was low-pressure distillated to examine the condensation behavior of 233PaF5 and key metal fluorides at different temperatures. Then, the optimal temperature of key metal fluorides was evaluated and the separation characteristics between them and 233PaF5 were figured out. Finally, the separation factors of 233PaF5 and the other metal fluorides were calculated and compared with those of th