NONISOTHERMAL GRAVIMETRIC INVESTIGATION ON KINETICS OF REDUCTION OF MAGNESIA BY CARBON AND ALUMINUM

摘要

Magnesium has been well known as one of the excellent agent of desulfurization, deoxidation, etc. in iron- and steelmaking because of its high reactivity. Since its production is energy intensive, the price is very high. Thus magnesium has not widely been used as an agent in metal refining processes. In the present work, reduction of magnesia by carbon and aluminum is examined. Because the reaction is very sensitive to temperature, non-isothermal technique is applied to investigate the reaction kinetics. The effects of heating rate and reaction interface area on the reaction kinetics are studied. A kinetic model is proposed based on the experimental results.