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Graphitization of Coke and Its Interaction with Slag in the Hearth of a Blast Furnace

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Abstract

Coke reaction behavior in the blast furnace hearth has yet to be fully understood due to limited access to the high temperature zone. The graphitization of coke and its interaction with slag in the hearth of blast furnace were investigated with samples obtained from the center of the deadman of a blast furnace during its overhaul period. All hearth coke samples from fines to lumps were confirmed to be highly graphitized, and the graphitization of coke in the high temperature zone was convinced to start from the coke surface and lead to the formation of coke fines. It will be essential to perform further comprehensive investigations on graphite formation and its evolution in a coke as well as its multi-effect on blast furnace performance. The porous hearth cokes were found to be filled up with final slag. Further research is required about the capability of coke to fill final slag and the attack of final slag on the hearth bottom refractories since this might be a new degradation mechanism of refractories located in the hearth bottom.

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This work was financially supported by the Open Foundation of the State Key Laboratory of Advanced Metallurgy (41603007), the National Natural Science Foundation of China and Baosteel Group Co., LTD of Shanghai for the Key Joint Project (U1260202), and the National Science Foundation for Young Scientists of China (51304014). The authors gratefully acknowledge financial support from China Scholarship Council (award to Kejiang Li for one year’s study abroad at the University of Toronto).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Kejiang Li (PhD Candidate, Visiting PhD Candidate), Jianliang Zhang (Professor), Yanxiang Liu (PhD Candidate), Zhengjian Liu (Lecturer), Jianbo Zhong (Master Candidate), Mengfang Wei (Engineer), Guangwei Wang (Lecturer) & Tianjun Yang (Professor)

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, No. 30 Xueyuan Rd, Haidian District, Beijing, 100083, P.R. China

    Kejiang Li (PhD Candidate, Visiting PhD Candidate), Jianliang Zhang (Professor), Yanxiang Liu (PhD Candidate), Zhengjian Liu (Lecturer), Jianbo Zhong (Master Candidate), Mengfang Wei (Engineer), Guangwei Wang (Lecturer) & Tianjun Yang (Professor)

  3. Department of Materials Science and Engineering, University of Toronto, Toronto, ON, M5S 3E4, Canada

    Kejiang Li (PhD Candidate, Visiting PhD Candidate) & Mansoor Barati (Professor)

  4. China Metallurgical Industry Planning and Research Institute, Beijing, 100711, P.R. China

    Buxin Su (Engineer)

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  1. Kejiang Li
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  2. Jianliang Zhang
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  3. Yanxiang Liu
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  5. Zhengjian Liu
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  8. Mengfang Wei
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Correspondence to Jianliang Zhang.

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Manuscript submitted June 1, 2015.

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Li, K., Zhang, J., Liu, Y. et al. Graphitization of Coke and Its Interaction with Slag in the Hearth of a Blast Furnace. Metall Mater Trans B 47, 811–818 (2016). https://doi.org/10.1007/s11663-015-0574-9

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  • DOI: https://doi.org/10.1007/s11663-015-0574-9

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