Minerals
Enhanced Slag–Metal Separation for Preparation of Al-Si Alloys from Crystalline Silicon Cutting Waste by a CaO-Al2O3-CaF2 Slag Treatment
Crystalline silicon cutting waste (SCW) is a promising secondary silicon resource for Al-Si alloy production, but high-melting Al2O3 generated during aluminothermic reduction hinders alloy droplet coalescence and slag–metal separation. In this study, a CaO-Al2O3-CaF2 slag treatment strategy was developed to regulate in situ formed Al2O3 and improve Al-Si alloy recovery from SCW. The effects of slag composition, smelting temperature, and holding time on separation behavior, massive alloy yield, and Si recovery were …