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Effect of the Particle Size of Iron Ore on the Pyrolysis Kinetic Behaviour of Coal-Iron Ore Briquettes

Author

Listed:
  • Heng Zheng

    (State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Wei Wang

    (State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Runsheng Xu

    (State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
    Montanuniversität Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria)

  • Rian Zan

    (Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China)

  • Johannes Schenk

    (Montanuniversität Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria)

  • Zhengliang Xue

    (State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China)

Abstract

High reactivity coke is beneficial for achieving low carbon emission blast furnace ironmaking. Therefore, the preparation of highly reactive ferro-coke has aroused widespread attention. However, the effects of the particle size of iron ore on the pyrolysis behaviour of a coal-iron ore briquette are still unclear. In this study, the effect of three particle sizes (0.50–1.00 mm, 0.25–0.50 mm and <0.74 mm) of iron ore on the thermal and kinetic behaviours of coal-iron ore briquettes were investigated by non-isothermal kinetic analysis. The results showed that the synergistic effect of iron ore and coal during coking mainly occurred during the later reaction stage (850–1100 °C) and smaller particle sizes of iron ore have a stronger synergistic effect. The addition of iron ore had little effect on T 0 (the initial temperature) and T p (the temperature at the maximum conversion rate) of briquette pyrolysis, however itgreatly affected the conversion rate and T f (the final temperature) of the briquettes. T 0 decreased with the decrease of iron ore particle sizes, while T p and T f showed opposite trends. After adding iron ore into the coal briquette, the reaction kinetics at all stages of the coal-iron ore briquettes changed. The weighted apparent activation energy of the caking coal (JM) briquette was 35.532 kJ/mol, which is lower than that of the coal-iron ore briquettes (38.703–55.627 kJ/mol). In addition, the weighted apparent activation energy gradually increased with decreasing iron ore particle sizes.

Suggested Citation

  • Heng Zheng & Wei Wang & Runsheng Xu & Rian Zan & Johannes Schenk & Zhengliang Xue, 2018. "Effect of the Particle Size of Iron Ore on the Pyrolysis Kinetic Behaviour of Coal-Iron Ore Briquettes," Energies, MDPI, vol. 11(10), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2595-:d:172736
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    References listed on IDEAS

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    1. Xu, Bin & Lin, Boqiang, 2016. "Assessing CO2 emissions in China’s iron and steel industry: A dynamic vector autoregression model," Applied Energy, Elsevier, vol. 161(C), pages 375-386.
    2. Xu, Bin & Lin, Boqiang, 2017. "Assessing CO2 emissions in China's iron and steel industry: A nonparametric additive regression approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 72(C), pages 325-337.
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    Cited by:

    1. Rian Zan & Wei Wang & Runsheng Xu & Johannes Schenk & Heng Zheng & Haoxiang Wang, 2019. "Gasification Characteristics and Kinetics of Unburned Pulverized Coal in Blast Furnaces," Energies, MDPI, vol. 12(22), pages 1-14, November.

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