Facile Electrochemical Preparation of Al-Sm Alloys in Molten Calcium Chloride

被引：2
|
作者：
Li, Junfeng [1 ]
Wang, Mingyong [1 ]
Tu, Jiguo [1 ]
Jiao, Shuqiang [1 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2018年 / 165卷 / 11期
关键词：
DIRECT ELECTROLYTIC PREPARATION; CATHODIC BEHAVIOR; TITANIUM-DIOXIDE; CACL2-NACL MELT; CHROMIUM POWDER; CO-REDUCTION; LICL-KCL; SAMARIUM; ELECTRODES; EXTRACTION;
D O I：
10.1149/2.0161813jes
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The direct preparation of metallic Sm or alloys from raw oxide Sm2O3 is an attracting but challenging process. The stable electrochemical behavior and low solubility of Sm2O3 limit the extraction of Sm element in molten salts. Here, it is found that metallic Sm is hardly obtained by electro-deoxidation and aluminothermic reduction of solid Sm2O3 pellet according to experiment and calculation. Through the novel electrochemical reduction of solid Sm2O3-Al pellet, Al3Sm alloy with similar to 0.4 Sm/Al molar ratio is successfully prepared in calcium chloride melt at 1173 K. The reduction potential of Sm2O3-Al pellet to Al-Sm alloy is more positive than that of calcium. Al plays an indispensable role in the reduction of Sm2O3. The preparation process of alloy can be well identified as two steps: Sm(III) -> Sm(II) and Sm(II) -> Sm(0). Sm2O3 is firstly converted to Sm(II) based on the combination of electrochemical and aluminothermic reduction. Then, Al3Sm is formed by electrochemical reduction and alloying with Al. (C) 2018 The Electrochemical Society.
引用
收藏
页码：E616 / E621
页数：6
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