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The nonisothermal behavior of the oxidation of natural ilmenite pellets was interpreted in the light of a nonisothermal kinetic model which fits the experimental results very well.The rate of the overall oxidation was predominantly controlled by the intrapellet diffusion of oxygen and the rate of heat transfer was mainly limited by the heat conduction through the product layer.The oxidation of natural ilmenite pellet can not be treated as an isothermal reaction system within the temperature range of 1073～ 1173K unless the concentration of oxygen in the gaseous reactants is less than 10 mol%.