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In order to optimize the current reduction process of chromite, a good   knowledge of reduction mechanism involved is required. The basic component in   chromite ore is FeCr2O4 with gangue component like MgO and Al2O3. In lack of   clear and consistent explanation about the effect of addition on the   reduction of FeCr2O4, investigation of synthetic FeCr2O4 with different kind   and amount of additions was carried out at 1673K under isothermal mode.   Kinetic mechanism was also studied by linear fitting of different kinetic   equations. Combined with rate-controlling step, it could be concluded as   follows. CaO could enhance the reduction because Ca2+ would replace Fe2+,   thus facilitated the ion diffusion in solid phase. Al2O3 had a positive   influence as well, since Al3+ could form a solid solution phase with Cr3+ and   made Cr3+ reduced more easily. MgO would hinder the reduction due to   formation of a more stable phase MgCr2O4. SiO2 would also hamper the Cr   metallization because there was a liquid phase formed when Cr3+ was reduced   to divalent, which would impede the nucleation of reduction product

Effects of CaO, MgO, Al2O3 and SiO2 on the carbothermic reduction of synthetic FeCr2O4