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Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke

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Abstract

Highly reactive ferro-coke has been widely studied due to its contribution to the energy saving and emission reduction in blast furnace ironmaking. To optimize the coking process of ferro-coke and improve its metallurgical properties, it is necessary to clarify the influence of initial iron ore on the strength, micro-morphology and CO2 gasification reaction behavior of formed ferro-coke. The effects of initial iron ore particle size (0.50–1.00, 0.25–0.50 and 0.074–0.125 mm) on the CO2 gasification reaction of ferro-coke were analyzed using thermo-analysis technique. In addition, the effects of initial iron ore particle size on the strength and morphology of ferro-coke were investigated by drum test, digital microscopy and scanning electron microscopy. The results show that iron reduced from iron ore has a great promotion effect on the CO2 gasification reaction of ferro-coke. The smaller the particle size of initial iron ore, the more intense the gasification reaction, and the lower the starting temperature for gasification reaction of ferro-coke. The results of kinetic calculation show that the apparent activation energy of ferro-coke decreases with the decreasing particle size of blended iron ore. The particle size of initial iron ore has a great impact on the strength of ferro-coke. The ferro-coke prepared by 0.25–0.50 mm iron ore presents the best strength in this experiment.

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Acknowledgements

The authors acknowledge financial support from the National Natural Science Foundation of China (51704216 and U1760101), National Postdoctoral Program for Innovative Talents Funded Project (BX20180023) and China Postdoctoral Science Foundation Funded Project (2019M650424).

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Authors and Affiliations

  1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Run-sheng Xu, Shu-liang Deng, Wei Wang & Ming-ming Song

  2. Chair of Metallurgy, Montanuniversität Leoben, Leoben, A-8700, Austria

    Run-sheng Xu & Heng Zheng

  3. Wuhan Iron and Steel Co., Ltd., Wuhan, 430081, Hubei, China

    Wei Xu

  4. School of Energy and Power Engineering, Beihang University, Beijing, 100191, China

    Fang-fang Wang

  5. Ningbo Institute of Technology, Beihang University, Ningbo, 315800, Zhejiang, China

    Fang-fang Wang

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  1. Run-sheng Xu
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  2. Shu-liang Deng
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  3. Heng Zheng
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  4. Wei Wang
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Correspondence to Wei Wang or Fang-fang Wang.

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Xu, Rs., Deng, Sl., Zheng, H. et al. Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke. J. Iron Steel Res. Int. 27, 875–886 (2020). https://doi.org/10.1007/s42243-020-00454-5

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  • DOI: https://doi.org/10.1007/s42243-020-00454-5

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