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The Effect of Mechanical Activation on the Carbothermic Reduction Kinetics of Hematite-Graphite Mixture
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نویسنده
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Mohseni F. ,Abbasi M. H. ,Panjepour M.
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منبع
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International Journal Of Iron And Steel Society Of Iran - 2010 - دوره : 7 - شماره : 2 - صفحه:26 -33
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چکیده
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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/0=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
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کلیدواژه
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Mechanical Activation ,Thermal Analysis ,Kinetic Analysis ,Activation Energy ,Hematite ,Carbothermic Reduction.
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آدرس
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Isfahan University Of Technology, Department Of Materials Engineering, ایران, Isfahan University Of Technology, Department Of Materials Engineering, ایران, Isfahan University Of Technology, Department Of Materials Engineering, ایران
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Authors
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