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Interfaces Between Coke, Slag, and Metal in the Tuyere Level of a Blast Furnace

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Abstract

An in-depth understanding about the reactions in the high-temperature zone of a blast furnace is significant to optimize both the current and future blast furnace process. The interfaces between coke, slag, and metal were observed using scanning electronic microscope with samples obtained from the tuyere level of a blast furnace. Two types of slag phases were identified, one originating from coke ash and the other from the bosh slag. Slag formed by coke ash was seen to cover the coke surface, which may hinder the reaction of coke with both gas and liquid iron. The reduction of FeO from the bosh slag (originated from the primary slag) occurs in the coke/slag interface with the reduced iron forming a metal layer surrounding the coke surface. The reduction of SiO2 occurs both in and outside the coke, and the reduced silicon reacts with iron to form iron silicide if the two species come into contact. Further study is proposed based on the results of this study.

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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, Baosteel Group Co., Ltd., of Shanghai for the Key Joint Project (U1260202), and the National Science Foundation for Young Scientists of China (51304014).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Rd, Haidian District, Beijing, 100083, P.R. China

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

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, P.R. China

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

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

    Mansoor Barati (Professor)

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  1. Kejiang Li
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  2. Jianliang Zhang
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Correspondence to Zhengjian Liu.

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Manuscript submitted January 17, 2015.

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Li, K., Zhang, J., Liu, Z. et al. Interfaces Between Coke, Slag, and Metal in the Tuyere Level of a Blast Furnace. Metall Mater Trans B 46, 1104–1111 (2015). https://doi.org/10.1007/s11663-015-0335-9

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  • DOI: https://doi.org/10.1007/s11663-015-0335-9

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