Fluorination Process of UF4 in Molten Salt
-
Graphical Abstract
-
Abstract
Fluoride volatility method is regarded as a promising advanced pyrochemical reprocessing technology, which can be used for separation and recovery of uranium from spent fuel. The fluorination of UF4 by F2 to produce UF6 in KF-ZrF4(x=42%-58%, FKZr) has been investigated. In this study, the Fourier transform infrared spectroscopy(FTIR) was used for in-situ monitoring of fluorination process. The product of fluorination, UF6, was collected by the multi-stage condensation. After the fluorination, the uranium mass fraction in the molten salt is below 2.5×10-3%, the UF4 conversion rate is higher than 99.9% and the product recovery is above 90%. The results show that the fluorination process, and the in-situ monitoring of process by FTIR are feasible. In addition, the study also show that the fluorination has high decontamination efficiency for UF6 product, and the decontamination factors for alkali metals and rare earth elements are 103 to 105.
-
-