Scale-Up Study of Molten Salt Electrolysis using Cu or Ag Cathode and Vacuum Distillation for the Production of High-Purity Mg Metal from MgO

被引：17

作者：

Lee, Dong-Hee ^{[1
]}

Jeoung, Hyeong-Jun ^{[1
,2
]}

Lee, Tae-Hyuk ^{[1
]}

Yi, Kyung-Woo ^{[2
]}

Lee, Jin-Young ^{[1
,3
]}

Kim, Young Min ^{[4
]}

Okabe, Toru H. ^{[5
]}

Kang, Jungshin ^{[1
,3
]}

机构：

[1] Korea Inst Geosci & Mineral Resources, 124 Gwahak Ro, Daejeon 34132, South Korea

[2] Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea

[3] Univ Sci & Technol, Dept Resources Recycling, 217 Gajeong Ro, Daejeon 34113, South Korea

[4] Korea Inst Mat Sci, 797 Changwondae Ro, Chang Won 51508, Gyeongnam, South Korea

[5] Univ Tokyo, Inst Ind Sci, Meguro Ku, 4-6-1 Komaba, Tokyo 1538505, Japan

来源：

JOURNAL OF SUSTAINABLE METALLURGY | 2021年 / 7卷 / 03期

关键词：

Magnesium; Magnesium oxide; Metal cathode; Electrolytic process; Vacuum distillation; MAGNESIUM; REMOVAL;

D O I：

10.1007/s40831-021-00367-x

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

To produce high-purity Mg metal directly from MgO, the scale-up of a novel electrolytic process using a metal cathode and vacuum distillation was investigated. The electrolysis of MgO was conducted in MgF2-LiF molten salt using Cu or Ag cathode and graphite anode at 1053 K. The influence of the cathode metal and the concentration of Mg in the Mg alloy on the current efficiency was investigated. In addition, the interaction of Al2O3 in contact with the electrolyte and cathode was studied. When electrolysis was carried out with an applied current of 8.81-9.59 A for 75-95 h, Mg alloys such as Mg2Cu and MgAg were produced with a current efficiency of 82.2-88.0%. In addition, owing to the reaction between the Mg alloy and Al2O3, a dense layer of magnesium aluminum oxide was produced. Afterward, when the vacuum distillation of the Mg alloys was conducted at 1300 K, 99.9997% Mg metal was obtained.

引用

页码：883 / 897

页数：15

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