Chromite ore is the sole commercial source of chromium which is mainly present in the form of spinel containing multiple metal elements with the chemical formula of (Mg,Fe)(Cr,Al,Fe) 2 O 4 [1,2,3].Depending on its content of Cr 2 O 3 and the mass ratio of Cr/Fe, chromite ore can be used in the fields of metallurgy, chemicals, and refractories. …