Reduction Rate of Iron Oxide Pellets with Hydrogen

概要

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For analyzing the reduction process in the metallurgical reactor, especially in blast furnace, the reduction rates of hematite pellet and iron oxide pellet pre-reduced to wustite, "wustite pellet", were expressed by a mathematical model and the rate parameters thereof were determined. An unreacted core model was applied to simulate the hydrogen reduction of iron oxide pellets within the temperature range from 850 to 1, 150℃. Comparison of the rate constant of chemical reaction and its activation energy of hematite pellet with those of wustite pellet did not show significant difference. The pellets used had an activation energy of about 21 to 26 kcal/mol. In the macro- and microscopic observation of iron oxide pellets during the reduction, the reaction proceeded topochemically. A sharp interface was found between wustite and iron phase in the case of hematite pellet, whereas reaction zone of about 300μ was found in the case of wustite pellet. The calculated reduction curves almost agreed with the observed values with the changes of temperatures, diameters of the pellet and concentrations of reducing gas. These calculated curves further agreed with the values observed by altering one of the experimental conditions during reduction.
東北大学の論文