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Transient Interaction Between Reduction and Slagging Reactions of Wustite in Simulated Cohesive Zone of Blast Furnace

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Abstract

The blast furnace cohesive zone plays an important role in the gas flow distribution and heat-transfer efficiency. Previous work mainly employed temperature-based indices to evaluate and predict the shape and thickness of the cohesive zone, whereas the internal reactions and related effects on the softening and melting properties of a complex burden are ignored. In this study, an innovative index, namely, shrinkage rate (SR), is first proposed to directly estimate the shrinkage behavior of wustite (FeO)-packed bed inside a simulated cohesive zone. The index is applied as the temperature increases to elucidate the transient interaction between reduction and slagging reactions. Results show that the thermally induced slagging reaction causes the packed bed to shrink at lower temperature, and the SR doubles when compounds with low melting temperature are generated by adding a reasonable concentration of CaO or SiO2. The reduction reaction becomes the driving force during the shrinkage of the packed bed between 1173 K and 1273 K when CO is introduced in the mixture gas. Then, the dominating factors for further shrinkage include slagging, reduction, or both factors. These factors vary with respect to the added compounds or temperature.

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Acknowledgments

The authors appreciate the valuable suggestions and comments from the anonymous reviewers, key readers and editors. The authors are also grateful to the National Natural Science Foundation of China (51304257, 91634106) for their support extended to this project, and the Natural Science Foundation of Chongqing, China (cstc2015jcyjA50014), and the financial support from the National Natural Science Foundation of China (51374263, 51474042) is also gratefully acknowledged.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Kaihui Ma, Jian Xu, Junyi Deng, Dongdong Wang, Yang Xu, Zhehan Liao, Chengfeng Sun, Shengfu Zhang & Liangying Wen

  2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University, Chongqing, 400044, China

    Jian Xu, Shengfu Zhang & Liangying Wen

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  1. Kaihui Ma
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  2. Jian Xu
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  3. Junyi Deng
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  4. Dongdong Wang
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  5. Yang Xu
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  6. Zhehan Liao
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  7. Chengfeng Sun
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  8. Shengfu Zhang
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  9. Liangying Wen
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Correspondence to Jian Xu.

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Manuscript submitted October 17, 2017.

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Ma, K., Xu, J., Deng, J. et al. Transient Interaction Between Reduction and Slagging Reactions of Wustite in Simulated Cohesive Zone of Blast Furnace. Metall Mater Trans B 49, 2308–2321 (2018). https://doi.org/10.1007/s11663-018-1307-7

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  • DOI: https://doi.org/10.1007/s11663-018-1307-7

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