Effect of Al and MgO on the simultaneous alloying of diamond wire saw silicon waste and Ti-bearing blast furnace slag

Abstract

Diamond wire saw silicon waste (DWSSW) and Ti-bearing blast furnace slag (TBFS) are industrial solid wastes that contain large amounts of Si and Ti, whose accumulation unnecessarily wastes resources. In this paper, DWSSW and TBFS were mixed and melted in an induction furnace by simultaneous alloying, and Ti and Si were recovered by a Si-Ti alloy. In addition, the optimal material ratio of DWSSW and TBFS was determined. 10–30% reducing agent Al and 5–15% fluxing agent MgO were added to explore the effect of additives on the co-processing of DWSSW and TBFS. The results showed that Al promoted the reduction of Ti and the recovery of Si. When 20% Al was added, the recovery ratio of Ti in TBFS reached 95.62%, and the recovery ratio of Si reached 80.53%. Adding MgO changed the slag composition, simplified the slag structure, and reduced the viscosity. The recovery ratio of Ti from TBFS reached 96.18% when 15% MgO was added. The two additives promoted the alloying co-processing of DWSSW and TBFS, which provided a more efficient clean utilization process for these two solid wastes.