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COMSOL을 활용한 신 마그네슘 전해 공정 수치해석 모델 개발
조매현,정형준,강정신,장근옥 대한금속·재료학회 2023 대한금속·재료학회지 Vol.61 No.8
Magnesium (Mg) has good physical properties including light weight, excellent specific strengthand high stiffness, and Mg is used in many fields. But current production methods of Mg have disadvantages,such as the generation of sulfur oxide and chlorine gas. In this situation, The Korea Institute of Geoscienceand Mineral Resources (KIGAM) developed a Molten Salt Electrolysis Using Liquid Metal Cathode (MSELMC)method to produce high-purity magnesium. The MSE-LMC method can obtain 99.998-99.999% highpuritymagnesium by the electrolysis of MgO dissolved in (MgF2)-LiF molten salt at 1053-1083 K, and byvacuum distilling an alloy generated by reacting with a metallic liquid cathode at 1200-1300 K. This studydeveloped a numerical analysis model using COMSOL Multiphysics electrodeposition module to optimize thedesign of the electrolysis process. The model temperature was 1053K and molten salt was 54MgF2-46LiF witha 0.6wt% MgO system. 10A constant current was applied at the anode. This model uses the Butler-Volmerequation and the Nernst equation for the electric reaction. The Stokes-Einstein equation and Nernst-Einsteinrelation were used to calculate the diffusivity and electric mobility of salts. Unlike the experiment, in thismodel chlorine gas was generated. However, this model satisfied Faraday’s law. Therefore we define a newparameter using electric flux and voltage to conduct a quantitative evaluation according to the electrodeshape, and compared that parameter by the changing angle of the anode.
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