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Lump Iron Ore Pre-heating Treatment to Improve Softening-Melting Performance and Reduce Energy Consumption in Ironmaking Process

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Abstract

To reduce the proportion of high energy consumption and pollution processes such as sintering and pelletizing, and to make full use of the waste heat resources of steel plant, a lump ore pre-heating treatment is proposed. The mineralogical properties of mainstream lump iron ores were first analyzed using chemical analysis, XRD-Rietveld, BET testing and thermogravimetry. Subsequent experiments investigated the decrepitation behavior of lump ore and the feasibility of pre-heating treatment, and finally the utilization of waste heat resources was discussed in some detail as well. The results show that lump iron ore decrepitation is due to the presence of goethite FeO(OH), which starts to decompose at 200–300°C and almost completely removes its crystal water before 500°C. After pre-heating treatment at 4°C/min temperature rise, lump iron ores almost no longer decrepitate, and the reducibility, softening-melting performance and gas permeability in blast furnace are significantly improved.

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Acknowledgements

This work was supported by the Postdoctoral Fund of University of Science and Technology Beijing (2021M690369), Guangdong Basic & Applied Basic Research Fund Joint Regional Funds-Youth Foundation Projects (2020A1515111008) and the Central Universities Foundation of China (06500170).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Lele Niu, Jianliang Zhang, Jianqiang Huang, Ben Feng & Zhengjian Liu

  2. Institute of Artificial Intelligence, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Yaozu Wang

  3. School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia

    Jianliang Zhang

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  1. Lele Niu
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Correspondence to Zhengjian Liu.

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Niu, L., Zhang, J., Wang, Y. et al. Lump Iron Ore Pre-heating Treatment to Improve Softening-Melting Performance and Reduce Energy Consumption in Ironmaking Process. JOM 74, 2733–2741 (2022). https://doi.org/10.1007/s11837-022-05301-4

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  • DOI: https://doi.org/10.1007/s11837-022-05301-4

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