Abstract
Electrorefining in molten salt is a promising solar-grade silicon production process due to its low-cost, energy-saving and eco-friendly characteristics. After the silicon electrorefining process, the impurities in the metallurgical-grade silicon are induced into the salt. However, the salt has to be ultrapure and the impurity concentration in molten salt must be strictly controlled to produce high-purity silicon. This work electropurified the eutectic CaCl2-CaF2 molten salt after the silicon electrorefining process. The cyclic voltammetry is used to identify the impurity level of the salt. The single-potential and multi-potential electropurification process have been conducted and compared. The multi-potential electropurification process is proven to be more efficient in impurity removal. After the multi-potential electropurification process, the salt can be regenerated to its original impurity level, indicating a reusable high-purity salt for solar-grade silicon electrorefining.
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