|About this Abstract
||Liquid Metal Processing & Casting Conference (LMPC 2019)
||Liquid Metal Processing & Casting
||Electrolytic Production of Silicon using Liquid Zn Alloy Cathode in Molten CaCl2
||Kouji Yasuda, Akifumi Ido, Takeyuki Shimao, Rika Hagiwara, Toshiyuki Nohira
|On-Site Speaker (Planned)
A new electrolytic production process for solar-grade Si has been proposed utilizing a liquid Si-Zn alloy cathode in molten CaCl2. The process consists of three major processes: electrolysis, precipitation, and refining. One of the advantages of the process is the attainability of high purity by application of a solidification refining from the liquid Si-Zn alloy. The residual zinc is easily removed afterwards due to its high volatility. To establish this process, the behavior of liquid Zn metal in molten CaCl2 at 1123 K was investigated. Evaporation of Zn metal was largely suppressed by immersion into the molten salt, which enabled the use of a Zn electrode despite its high vapor pressure. Based on the results of cyclic voltammetry, the reduction of SiO2 on a liquid Zn cathode was conducted by potentiostatic electrolysis at 0.9 V vs. Ca2+/Ca. Precipitated Si particles were recovered in the solidified Zn matrix.
||Definite: At-meeting proceedings