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Reduction Swelling Mechanism for Different Types of Pellets Based on Continuous Imaging Analysis

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Abstract

The charging ratio of pellets in a blast furnace is largely governed by the properties of the reduction swelling index (RSI). The RSI of three types of common pellets—acid, magnesium and magnesium flux—were obtained using the Chinese standard (CS) test and imaging analysis (IA). XRD and SEM were performed to measure the mineral composition and morphology of the pellets. The results indicated that, regardless of the type of pellet, RSI using the CS test was lower than that using IA. The minimum difference was 3.62% for the magnesium pellet, which indicates that CS is suitable for pellets with lower RSI. The RSI of the acid pellet was highest due to the effect of lattice transformation. However, the sufficient bonding strength of the high-melting-point slag with CaO-bearing or MgO-bearing flux pellets could restrain the growth of iron whiskers, thereby decreasing the RSI. Additionally, we concluded that the RSI of pellets reaches its maximum at approximately 30–40 min during reduction.

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Acknowledgement

The authors gratefully acknowledge the project supported by National Natural Science Foundation of China (No. U1960205).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, People’s Republic of China

    Kaikai Bai, Haibin Zuo, Binbin Lv, Jingsong Wang & Qingguo Xue

  2. Hunan Valin Xiangtan Iron and Steel Co. Ltd, Hunan, People’s Republic of China

    Yuzhu Pan

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  1. Kaikai Bai
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Bai, K., Zuo, H., Lv, B. et al. Reduction Swelling Mechanism for Different Types of Pellets Based on Continuous Imaging Analysis. JOM 74, 2010–2018 (2022). https://doi.org/10.1007/s11837-021-05074-2

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