Study on Crystallization Behavior of NdF3-LiF-Nd2O3-NdF2 Molten Salt System
In the molten salt electrolysis process of rare earth oxide in fluoride system,the crystallization behavior of the molten salt significantly affects the electrolysis process.The study investigated three mol-ten salt systems,namely NdF3-LiF-Nd2O3,NdF3-LiF-NdF2,and NdF3-LiF-Nd2O3-NdF2(with a fixed mass ratio of NdF3 to LiF of 85∶15),to measure the crystallization temperature of the molten salt using the cooling viscosity curve and analyze the crystalline phase by XRD.The results show that in the molten salt systems of NdF3-LiF-Nd2O3 and NdF3-LiF-NdF2,the crystallization temperature of the molten salt increa-ses with the increase in Nd2O3 or NdF2 content,and the crystalline phases are NdOF and NdF2,respective-ly.In the molten salt system of NdF3-LiF-Nd2O3-NdF2,when the Nd2O3 content is in the range of 2％～3％with the NdF2 content in the range of l％～3％,the crystallization temperature of the molten salt is in 981～988 ℃,and NdOF cocrystallizes with NdF2.To inhibit the crystallization and precipitation of the molten salt during the molten salt electrolysis process of rare earth,effective measures could be taken by appropriately increasing the temperature at the bottom of the electrolysis cell and improving the flowability of the molten salt at the bottom.
molten salt electrolysisNdF3-LiF-Nd2O3-NdF2viscositycrystallization temperaturecrystalline phase
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