Study On Conductivity Distribution Of NdF₃-LiF-Nd₂O₃Molten Salts

Electrolysis of NdF₃-LiF-Nd₂O₃salts is an important process for produce the neodymium metal inmodern industry. There was a great significance that the distribution of temperature, concentration ofneodymium oxide and conductivity of molten salt was studied in the actual process of electrolytic. There isa few aspects of the research at home and abroad, however, it still stays in the aspect of theory, and doesnot combine with actual electrolytic process. Because of the high temperature environment of molten saltin electrolysis process, some parameters of physical and chemical is difficult to obtain. For this problem,the distribution of temperature and concentration of neodymium oxide were studied by designedexperiment, the conductivity of molten salt system was also studied, and the distribution of the temperature,the concentration of neodymium oxide and conductivity of molten salt of cell has been carried on byregression equation and BP neural network. The result can direct study of electric field of rare earth celland provide research foundation of large-scale development of rare earth cell.For the shortcomings of the temperature distribution of3KA cell in actual research, the temperaturedistribution and the change of product quality of neodymium electrolysis process in rare earth cell aboutthe domestic factory metal, and the change of temperature distribution of cell were actually measured.The influence of the quality of neodymium product, which of the second is better than the first about2%and the best which is37%, was determined by the different forms of temperature distribution, and theexternal influence factors of the change of temperature were analyzed.The concentration of Nd₂O₃of3KA cell was studied by a self-made multipoint sampling of hightemperature molten salt less4%, and analyzes the specific cause of this distribution form. Meanwhile,theconductivity of NdF₃-LiF-Nd₂O₃molten salt were studied by CVCC and ac impedance techniques, theinfluence of the temperature and composition of molten salt were analyzed, calculate the distribution formand the change of the conductivity of the electrical conductivity of calculation was obtained under thecondition of the second temperature distribution by a regression equation with2.5072².9490S·cm^-1, therewas a simulation calculation of the whole conductivity of molten salt distribution of3KA cell byMATLAB.Predicting the conductivity of actual molten salt of3KA cell in the electrolysis process by BP neuralnetwork at2.7819³.3480S·cm^-1, and the overall distribution was also analyzed. This study is shown thatwith train, test, simulation and prediction, the prediction of the conductivity of molten salt can be realized,and the results are basically in agreement with the actual situation.