Use of various MgO resources for high-purity Mg metal production through molten salt electrolysis and vacuum distillation

作     者：Hyeong-Jun Jeoung Tae-Hyuk Lee Youngjae Kim Jin-Young Lee Young Min Kim Toru HOkabe Kyung-Woo Yi Jungshin Kang 

作者机构：Korea Institute of Geoscience and Mineral Resources124 Gwahak-ro Yuseong-guDaejeon 34132South Korea Department of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Resources EngineeringUniversity of Science and Technology217 Gajeong-ro Yuseong-guDaejeon 34113South Korea Korea Institute of Materials Science797 Changwondae-roSeongsan-guChangwonGyeongnam 51508South Korea Institute of Industrial ScienceThe University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan School of Materials Science and EngineeringPusan National University2 Busandaehak-roGeumjeong-guBusan 44241South Korea 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2023年第11卷第2期

页      面：562-579页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Korea Evaluation Institute of Industrial Technology funded by the Korean Ministry of Industry in Korea (Project No.:20000970, 20–9805) Basic Research Project (22–3803) of the Korea Institute of Geoscience and Mineral Resources (KIGAM) funded by the Ministry of Science and ICT of Korea 

主　　题：High-purity magnesium Magnesium oxide resources Electrolytic process Metal cathode Vacuum distillation 

摘      要：A green and effective electrolytic process was developed to produce high-purity Mg metal using primary and secondary resources containing Mg O as a feedstock. The electrolysis of various Mg O resources was conducted using a Cu cathode in MgF2– LiF – KCl molten salt at 1043 K by applying an average current of 1.44 A for 12.5 h. The electrolysis of calcined North Korean magnesite and seawater Mg O clinker yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 89.6–92.4%. The electrolysis of oxidized Mg O-C refractory brick, aged ferronickel slag, and ferronickel slag yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 59.3–92.3%. The vacuum distillation of Mg alloys obtained was conducted at 1300 K for 10 h to produce high-purity Mg metal. After vacuum distillation, Mg metal with a purity of above 99.994% was obtained. Therefore, this study demonstrates the feasibility of the production of high-purity Mg metal from various Mg O resources using a novel electrolytic process with a Cu cathode, followed by vacuum distillation.