Problems of Neodymium Preparation through Fluoride System in Fused-salt Electrolysis and Its Improvement Suggestions
Liu Liliang1, Sun Jinming1, Zhao Zhiping2, Chen Jiguang3 (1.Ganzhou Yudong Industry (Group) Co. Ltd; 2. Resource and Environmental Engineering Institute, Jiangxi University of Technology; 3.Ganzhou Metallurgical Research Institute, Ganzhou, Jiangxi 341000)
Several processes to prepare neodymium such as chloride fused-salt system, neodymium magnesium intermediate alloy method, calcium thermal vacuum reduction neodymium fluorination method and fluoride system in fused-salt electrolysis neodymium oxidation method are introduced. Their advantages and disadvantages are also reviewed. Methods to reduce and stablize the carbon content in the metal neodymium are put forward. It is suggested to improve the current strength of a single furnace and enlarge the device and increase the varieties to ferroalloy, cylinder anode is used instead of graphite electrolytic cell, hanging graphite electrode single phase electric heating is used instead of hanging kryptol heating device from outside, which provide better results.