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Reduction behavior of iron ore powder by high-volatile coal in thermogravimetric–gas chromatographic and kinetic analysis

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Abstract

The reduction behavior of iron ore powder by high-volatile coal was investigated, and its kinetic mechanism was clarified. The effect of volatiles in coal on the reduction reaction of iron ore was compared by utilizing a Xinjiang lignite with a high volatile content and its pyrolysis carbon produced by high-temperature pyrolysis to remove volatiles, serving as a reductant. The mass loss and gas composition of the samples during the reduction process were detected using thermogravimetric analysis and gas chromatography, and the morphological changes of iron ore powder were observed through scanning electron microscopy. The kinetic parameters of the iron oxide reduction reaction were calculated by the Flynn–Ozawa–Wall method, and the kinetic mechanism of volatile participation in the iron oxide reduction reaction was determined through the Coats–Redfern method. The results indicate that the coupling effect between the high-volatile coal pyrolysis and reduction reactions occurs during the second stage of the entire coupling process, which corresponds to the late stage of coal pyrolysis with a substantial release of H2 and CO. The volatiles in coal actively participated in the reduction reaction, reducing the initiation temperature of the reaction by around 200 °C. The reduction of iron oxides by high-volatile coal was jointly promoted by the “hydrogen cycle” and “carbon cycle”, resulting in a higher reduction extent and metallization rate at the end of the reaction. When high-volatile coal was used as the reductant, the average activation energy for the entire process was 76.5 kJ/mol, a significant decrease compared to the employment of pyrolysis carbon without volatiles as the reductant (1167 kJ/mol).

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Acknowledgements

The authors gratefully acknowledged the China Postdoctoral Science Foundation (2021M702553), the Natural Science Basic Research Program of Shaanxi (2022JQ-428), the Shaanxi Provincial Department of Education Service Local Special Project (22JC042), and the Key Research and Development Program of Shaanxi (2021GY-128).

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Authors and Affiliations

  1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, Shaanxi, China

    Rui-meng Shi, Qi-yuan Mi, Bin Li & Chong Zou

  2. China International Engineering Consulting Corporation, Beijing, 100048, China

    Xiao Shi

  3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jing Guo & Han-jie Guo

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  1. Rui-meng Shi
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  2. Qi-yuan Mi
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Correspondence to Bin Li.

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Shi, Rm., Mi, Qy., Li, B. et al. Reduction behavior of iron ore powder by high-volatile coal in thermogravimetric–gas chromatographic and kinetic analysis. J. Iron Steel Res. Int. 31, 92–107 (2024). https://doi.org/10.1007/s42243-023-01143-9

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