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Study on Slag Phase Erosion Behavior and Mechanism of Carbon Composite Brick in Hydrogen-Rich Blast Furnace Hearth

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Advances in Pyrometallurgy (TMS 2024)

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

In this study, through thermodynamic calculation, the possible reactions of carbon composite bricks in a high-temperature water vapor environment were analyzed. The morphology of carbon composite bricks after water vapor erosion was investigated through a water vapor oxidation experiment. In addition, a damage investigation was carried out on a blast furnace using hydrogen-rich gas smelting. During the period, a green-white phase with a thickness of 150 mm–200 mm was found inside the carbon composite brick in the taphole area. The carbon bricks in this area were sampled, and XRD, chemical analysis, and SEM–EDS detection were carried out. The test results show that there is blast furnace slag erosion and harmful element Zn erosion in carbon composite bricks. The erosion of harmful elements caused the expansion and ring cracking of carbon composite bricks, resulting in further slag erosion, which eventually led to the macroscopic slag phase erosion in the taphole area. The service life of carbon composite bricks can be effectively improved by optimizing the structure of carbon composite bricks, reducing the number of pores, optimizing the pore structure, and promoting the formation of a slag-rich protective layer on the hot surface of carbon composite bricks by improving the structure of blast furnace slag system.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52204334).

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Authors and Affiliations

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

    Mingbo Song, Kexin Jiao, Cui Wang, Jianliang Zhang & Chuan Wang

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

    Jianliang Zhang & Chuan Wang

Authors
  1. Mingbo Song
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  2. Kexin Jiao
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  3. Cui Wang
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  4. Jianliang Zhang
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  5. Chuan Wang
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Corresponding author

Correspondence to Kexin Jiao .

Editor information

Editors and Affiliations

  1. CaEng Associates, Toronto, ON, Canada

    Gerardo R. F. Alvear Flores

  2. Eramet Norway, Sauda, Norway

    Camille Fleuriault

  3. RHI Magnesita Technology Center, Leoben, Austria

    Dean Gregurek

  4. Mintek, Johannesburg, South Africa

    Quinn G. Reynolds

  5. Tenova Pyromet, Johannesburg, South Africa

    Hugo Joubert

  6. Glencore Technology, Brisbane, QLD, Australia

    Stuart L. Nicol

  7. P. J. Mackey Technology, Inc., Kirkland, QC, Canada

    Phillip J. Mackey

  8. Kanthal AB, Hallstahammar, Sweden

    Jesse F. White

  9. Hatch, Johannesburg, South Africa

    Isabelle Nolet

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Song, M., Jiao, K., Wang, C., Zhang, J., Wang, C. (2024). Study on Slag Phase Erosion Behavior and Mechanism of Carbon Composite Brick in Hydrogen-Rich Blast Furnace Hearth. In: Alvear Flores, G.R.F., et al. Advances in Pyrometallurgy. TMS 2024. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-50176-0_8

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