Metallurgical grade silicon (MG-Si) contains iron (Fe) as its main impurity, where phosphorus (P) is occasionally enriched in the FeSi 2 Ti phase. Based on this phenomenon, the precipitation superiority of P in the silicon-iron-titanium (Si-Fe-Ti) phase was verified by Si-5Fe and Si-3Fe-2Ti (wt pct) alloy refining for MG-Si. Microscopic characterization showed that P enrichment in the Si-Fe-Ti phase was more than in the Si-Fe phase. Thermodynamically, FeTiP phase is more stable than Fe 3 P. Dynamically, Fe and Ti will increase the solubility of each other in the melt because the activity interaction coefficient of Fe and Ti is 5.7027. Therefore, during the solidification of the Si-Fe-Ti melt, the enhanced precipitation of Fe and Ti promotes the formation and co-precipitation of the Si-Fe-Ti and FeTiP phases. With acid leaching, the phosphorus removal efficiencies from MG-Si, the Si-Fe alloy, and Si-Fe-Ti alloy were 12.33, 39.15, and 71.20 pct, respectively, which again verify the distribution characteristics of P in different samples and its mechanistic analysis.

中文翻译：

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Si-Fe-Ti相重构促进冶金级硅除磷的机理

冶金级硅 (MG-Si) 包含铁 (Fe) 作为其主要杂质，其中磷 (P) 偶尔富集在 FeSi 2 Ti 相中。基于这一现象，通过用于MG-Si的Si-5Fe和Si-3Fe-2Ti（wt pct）合金精炼验证了P在硅-铁-钛（Si-Fe-Ti）相中的析出优势。显微表征表明，Si-Fe-Ti 相中 P 的富集程度高于 Si-Fe 相。在热力学上，FeTiP 相比 Fe 3 P 更稳定。在动力学上，Fe 和 Ti 会增加彼此在熔体中的溶解度，因为 Fe 和 Ti 的活性相互作用系数为 5.7027。因此，在 Si-Fe-Ti 熔体凝固过程中，Fe 和 Ti 析出的增强促进了 Si-Fe-Ti 和 FeTiP 相的形成和共沉淀。随着酸浸，