Effect of Si Addition on the Electrochemical Reduction Rate of SiO2 Granules in Molten CaCl2

被引:9
作者
Zhong, Ming [1 ]
Yang, Xiao [1 ]
Yasuda, Kouji [2 ,3 ]
Homma, Takayuki [4 ]
Nohira, Toshiyuki [1 ]
机构
[1] Kyoto Univ, Inst Adv Energy, Uji, Kyoto 6110011, Japan
[2] Kyoto Univ, Grad Sch Energy Sci, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan
[3] Kyoto Univ, Agcy Hlth Safety & Environm, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan
[4] Waseda Univ, Fac Sci & Engn, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan
来源
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2018年 / 49卷 / 01期
基金
日本科学技术振兴机构; 日本学术振兴会;
关键词
SOLAR-GRADE-SILICON; DIRECT ELECTROLYTIC REDUCTION; SOLID SIO2; 3-PHASE INTERLINES; DIOXIDE; SALT; ELECTROREDUCTION; LICL-KCL-CACL2;
D O I
10.1007/s11663-017-1132-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of adding Si powder/granules on the electrochemical reduction rate of SiO2 granules in molten CaCl2 was investigated. Various starting materials were prepared by mixing different amounts (up to 80 mass pct) of Si powder/granules (four different sizes: < 5, 20 to 100, 100 to 250 mu m, 0.5 to 1.0 mm) with SiO2 granules, with these materials then being electrochemically reduced for 20 minutes in molten CaCl2 at 0.6 V vs Ca2+/Ca and a temperature of 1123 K (850 degrees C). The effects of the size and amount of Si added on the reaction rates were then studied. When the size of the Si powder added is less than 5 mu m, the reaction rate decreases as more Si is added. When Si with a size of 20 to 100 or 100 to 250 mu m is used, the reaction rate does not change substantially with the amount added. When 0.5 to 1.0 mm Si is used, the reduction rate is the largest when 40 mass pct Si is added. The reduction rate is influenced by the reaction surface and the diffusion of O2- ions in the mixture. (C) The Minerals, Metals & Materials Society and ASM International 2017
引用
收藏
页码:341 / 348
页数:8
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