Abstract
Metallurgical preparation of solar-grade silicon is the most popular method, benefiting from the low costs and environmentally friendly. The paper employed a metallurgical method to purify silicon and investigated the removal of Fe and Ti from silicon by directional solidification synergized with slagging refining (slagging-directional solidification, SDS). The result showed that lower solidification velocity and stronger cooling conditions during directional solidification (DS) contributed to removing Fe and Ti impurities from ingots. The concentrations of Fe and Ti at the beginning of the ingot obtained by DS at optimum conditions were 0.04 wt% and 0.002 wt%. Based on this, the influence of SDS on Fe and Ti was investigated, finding the concentrations of Fe and Ti at the beginning of the ingot were 0.021 wt% and 0.001 wt% with removal rates of 98.55 % and 98.86 %. Compared to ingots obtained by DS, the removal rates of Fe and Ti increased by 1.31 % and 1.13 %, respectively. The results showed that SDS has been proven to enhance the removal of Fe and Ti from ingot. Finally, the removal mechanism of SDS was analyzed. The method of directional solidification synergized with slagging refining was a novel method to purify with a low cost and environmentally friendly.
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