Formation mechanism of the protective layer in a blast furnace hearth

Ke-xin Jiao, Jian-liang Zhang, Zheng-jian Liu, Meng Xu, Feng Liu

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    Ke-xin Jiao, Jian-liang Zhang, Zheng-jian Liu, Meng Xu, and Feng Liu, Formation mechanism of the protective layer in a blast furnace hearth, Int. J. Miner. Metall. Mater., 22(2015), No. 10, pp.1017-1024. https://dx.doi.org/10.1007/s12613-015-1163-2
    Ke-xin Jiao, Jian-liang Zhang, Zheng-jian Liu, Meng Xu, and Feng Liu, Formation mechanism of the protective layer in a blast furnace hearth, Int. J. Miner. Metall. Mater., 22(2015), No. 10, pp.1017-1024. https://dx.doi.org/10.1007/s12613-015-1163-2
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    Formation mechanism of the protective layer in a blast furnace hearth

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

    • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    • Shougang Research Institute of Technology, Beijing, 100043, China

    基金项目: 

    This work was financially supported by the Natural Science Foundation of China (No. 51304014), the Natural Science Foundation of China and Baosteel (No. 51134008), and the National Basic Research Program of China (No. 2012CB720401).

      通信作者:

      Jian-liang Zhang E-mail: jl.zhang@ustb.edu.cn

    中文摘要

    A variety of techniques, such as chemical analysis, scanning electron microscopy-energy dispersive spectroscopy, and X-ray diffraction, were applied to characterize the adhesion protective layer formed below the blast furnace taphole level when a certain amount of titanium- bearing burden was used. Samples of the protective layer were extracted to identify the chemical composition, phase assemblage, and distribution. Furthermore, the formation mechanism of the protective layer was determined after clarifying the source of each component. Finally, a technical strategy was proposed for achieving a stable protective layer in the hearth. The results show that the protective layer mainly exists in a bilayer form in the sidewall, namely, a titanium-bearing layer and a graphite layer. Both the layers contain the slag phase whose major crystalline phase is magnesium melilite (Ca2MgSi2O7) and the main source of the slag phase is coke ash. It is clearly determined that solid particles such as graphite, Ti(C,N) and MgAl2O4 play an important role in the formation of the protective layer, and the key factor for promoting the formation of a stable protective layer is reasonable control of the evolution behavior of coke.

     

    Formation mechanism of the protective layer in a blast furnace hearth

    Author Affilications

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

      • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

      • Shougang Research Institute of Technology, Beijing, 100043, China

    • Funds: 

      This work was financially supported by the Natural Science Foundation of China (No. 51304014), the Natural Science Foundation of China and Baosteel (No. 51134008), and the National Basic Research Program of China (No. 2012CB720401).

    • Received: 12 June 2014; Revised: 24 July 2014; Accepted: 02 September 2014;
    A variety of techniques, such as chemical analysis, scanning electron microscopy-energy dispersive spectroscopy, and X-ray diffraction, were applied to characterize the adhesion protective layer formed below the blast furnace taphole level when a certain amount of titanium- bearing burden was used. Samples of the protective layer were extracted to identify the chemical composition, phase assemblage, and distribution. Furthermore, the formation mechanism of the protective layer was determined after clarifying the source of each component. Finally, a technical strategy was proposed for achieving a stable protective layer in the hearth. The results show that the protective layer mainly exists in a bilayer form in the sidewall, namely, a titanium-bearing layer and a graphite layer. Both the layers contain the slag phase whose major crystalline phase is magnesium melilite (Ca2MgSi2O7) and the main source of the slag phase is coke ash. It is clearly determined that solid particles such as graphite, Ti(C,N) and MgAl2O4 play an important role in the formation of the protective layer, and the key factor for promoting the formation of a stable protective layer is reasonable control of the evolution behavior of coke.

     

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