%0 Journal Article %T The effect of mechanical activation on the carbothermic reduction kinetics of hematite-graphite mixture %J International Journal of Iron & Steel Society of Iran %I Iron & Steel Society of Iran %Z 2981-0388 %A Mohseni, F. %A Abbasi, M. H. %A Panjepour, M. %D 2010 %\ 12/01/2010 %V 7 %N 2 %P 26-33 %! The effect of mechanical activation on the carbothermic reduction kinetics of hematite-graphite mixture %K Mechanical activation %K Thermal Analysis %K Kinetic analysis %K Activation Energy %K Hematite %K Carbothermic reduction %R %X The effect of mechanical activation on structural changes and kinetics of carbothermic reduction of hematite with graphite was studied in this research. Hematite powder mixture with graphite (with stoichiometry ratio C/O=1) was milled for the time periods of zero to 50 hours, and the structural changes were studied using X ray diffraction (XRD). The effect of mechanical activation on the kinetics of hematite carbothermic reduction was studied by performing thermal analysis tests and by employing model-free and constant slope methods. The activation energy as well as the reaction mechanism was then determined. The results showed that by mechanical activation for a time period of 50 h, the activation energy is decreased from 387 kJ/mol-1 to 186 kJ/mol-1, and the starting temperature of the reaction is decreased from 1125 to 620°C. The Boudouard chemical reaction was determined as the rate controlling step. %U https://journal.issiran.com/article_6342_46869881877c3958c17f9bf2fc00c2f9.pdf