기계적 합금화법에 의한 헤마타이트의 고상환원

Abstract

The effects of mechanical alloying conditions and the type of reducing agent on the solid state reduction of haematite, Fe2O3 have been investigated at room temperature. Aluminium, titanium, zinc and copper were used as reducing agent. Nanocomposites of metal-oxide in which oxide particles with nano size were dispersed in Fe matrix were obtained by mechanical alloying of Fe2O3 with aluminium and titanium, respectively. However, the reduction of Fe2O3 by copper was not occurred. Composite materials of iron with Al2O3 and TiO2 were obtained from the system of Fe2O3-Al and Fe2O3-Ti after ball milling for 20 hrs and 30 hrs, respectively. And the system of Fe2O3-Zn resulted in the formation of FeO with ZnO after ball milling of 120 hrs. The final grain sizes of iron estimated by X-ray diffraction line-width measurement were in the ranges of 24~33 nm.