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Reduction Characteristics and Kinetics of Bayanobo Complex Iron Ore carbon bearing pellets

Journal of Iron and Steel Research International 2013年第5期20卷 28-33页

作者： DING Yin-gui WANG Jing-song SHE Xue-feng WANG Guang XUE Qing-guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The kinetics of isothermal reduction of the carbon bearing pellets, which were mainly composed of Bayanobo complex iron ore and pulverized coal, was investigated by thermogravimetry at the temperature of 1 273-1 673 K. The effects of xC/xO and the atmospheres on the extent of reduction also were investigated. The results indicate that the fractional reaction increased proportionally with temperature increasing and heating temperature is the significant influence factor to the reaction of carbon bearing pellets. The optimum xC/xO is 1.2 and the effect of atmosphere on the reduction of iron oxides is almost negligible. The results can be interpreted that the reaction was initially controlled by a mixed controlled mechanism of carbon gasification and interface chemical reaction, and in the later stage, interface chemical reaction became the rate-controlling step. Apparent activation energy values of reduction at different levels of fractional reaction were calculated. Before F （fraction of reaction）=0.5, the apparent activation energy ranges from 66.39 to 75.64 kJ/mol, while after F=0.5, the apparent activation energy is 80.98 to 85.37 kJ/mol.

关键词： Bayanobo complex iron ore carbon bearing pellet thermogravimetry apparent activation energy

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