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 

机构地区：[1]Korea Institute of Geoscience and Mineral Resources,124 Gwahak-ro Yuseong-gu,Daejeon 34132,South Korea [2]Department of Materials Science and Engineering,Seoul National University,1 Gwanak-ro,Gwanak-gu,Seoul 08826,South Korea [3]Department of Resources Engineering,University of Science and Technology,217 Gajeong-ro Yuseong-gu,Daejeon 34113,South Korea [4]Korea Institute of Materials Science,797 Changwondae-ro,Seongsan-gu,Changwon,Gyeongnam 51508,South Korea [5]Institute of Industrial Science,The University of Tokyo,4-6-1 Komaba,Meguro-ku,Tokyo 153-8505,Japan [6]School of Materials Science and Engineering,Pusan National University,2 Busandaehak-ro,Geumjeong-gu,Busan 44241,South Korea

出　　处：《Journal of Magnesium and Alloys》2023年第2期562-579,共18页镁合金学报（英文）

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。

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.

关 键 词：High-purity magnesium Magnesium oxide resources Electrolytic process Metal cathode Vacuum distillation 

分 类 号：TG146[一般工业技术—材料科学与工程]