Abstract: BaO-Fe2O3-SiO2 glass-ceramics were prepared with the iron ore tailings in ANSTEEL as starting material. The crystallization process, kinetics and microstructure of the glass-ceramic were investigated by DSC, XRD, SEM and FT-IR. The optimal heat-treatment schedule showed that the nucleation temperature is 700°C held for 2 h with the crystallization temperature 950°C held for 3 h and, as a result, the main and minor crystalline phases of the glass-ceramic are BaFe12O19 and BaSi2O5, respectively. The IR characteristic absorption peaks corresponding to BaFe12O19 were observed in the glass structure. The index of crystal growth is 2.8, which implies that crystals grow along three dimensional spaces. Moreover, the dielectric loss tangent is up to 0.44 while the magnetic loss tangent is only 0.017, which means that the glass-ceramic thus prepared is good at microwave dielectric properties.