Thermodynamic Analysis of Fe3Si Prepared from Steel Slag by Molten Salt Electrolytic

Steel slagSteel slag contains Fe, Si, Ca, AlAl, Mg, and other metalMetals elements, but its complex mineral phaseMineral phase and large yield leadLead to its resourceful treatment as an urgent problem. In order to realize the high value-added utilizationUtilization of steel slagSteel slag, this paper proposed a new idea of preparing Fe3SiFeSi with steel slagSteel slag in NaCl-CaCl2 by using molten salt electrolysisMolten salt electrolysis, and theoretical feasibility was analyzed through thermodynamic study. The results showed that no chemical reaction occurred in the molten saltMolten salt at 700–900 ℃, the electroreduction sequence of each metalMetals in the slagSlag was Fe, Si, AlAl, Mg, Ca, and the theoretical decompositionDecomposition voltage of Fe and Si electroreduction in the slagSlag is − 2.26 to − 1.45 V. Combined with the slagSlag components and Fe-Si phase diagram, the electroreduction of Fe and Si finally formed Fe3SiFeSi. Under above thermodynamic conditions, the preparationPreparation of Fe3SiFeSi from molten saltMolten salt electrolytic steel slagSteel slag was theoretically feasible.