Reaction Behavior of Stratified SiO2 Granules during Electrochemical Reduction in Molten CaCl2
Reaction Behavior of Stratified SiO2 Granules during Electrochemical Reduction in Molten CaCl2
复制标题
DOI：
10.1007/s11663-014-0056-5
复制
发表时间：
2014-03
期刊：
影响因子：
--
通讯作者：
Xiao Yang;K. Yasuda;T. Nohira;R. Hagiwara;T. Homma
中科院分区：
文献类型：
--
作者：
Xiao Yang;K. Yasuda;T. Nohira;R. Hagiwara;T. Homma
研究了层状SiO2颗粒在1123 K（850 °C）熔融CaCl2中的电化学还原行为，以开发太阳能级硅的新工艺。对用填充SiO2颗粒的石墨坩埚制备的电解电极的横截面进行了观察和分析。外观和SEM观察结果表明，总体还原是通过两种不同途径进行的。在一条路线中，还原沿着颗粒表面从靠近导体的SiO2到远离导体的SiO2进行。在另一种途径中，还原从颗粒表面进行到每个颗粒的核心。沿颗粒表面沿着的还原速度快于从表面到核心的还原速度。细SiO2颗粒有利于提高还原率。
The electrochemical reduction behavior of stratified SiO2granules in molten CaCl2at 1123 K (850 °C) was investigated to develop a new process for producing solar-grade silicon. The cross sections of the electrolyzed electrode prepared from a graphite crucible filled with SiO2granules were observed and analyzed. The visual and SEM observations indicate that the overall reduction proceedsviatwo different routes. In one route, the reduction proceeds along the granule surfaces from the SiO2near the conductor to the distant SiO2. In the other route, the reduction proceeds from the granule surface to the core of each granule. The reduction along the granule surfaces is faster than that from the surface to the core. Fine SiO2granules are expected to be favorable for a high reduction rate.