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Effect of atmosphere and basicity on softening–melting behavior of primary slag formation in cohesive zone

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Abstract

The softening–melting characteristics of ferrous burden play a crucial role in the thickness and position of the cohesive zone. The influence of the basicity and experimental atmosphere on the softening–melting behavior of primary slag under slag–coke interaction was investigated using in situ visualization method. The mechanism was analyzed using the FactSage software, X-ray diffraction, and electron probe microanalysis. The softening and melting temperatures of the samples increased with increasing basicity under different atmospheres. The difference between softening and melting temperatures is smaller in a H2 atmosphere than in a CO atmosphere; in H2 atmosphere, the range of softening zone in the cohesive zone was significantly thinner. The formed low-melting-point FeO-bearing phases decrease when H2 was used as the reducing agent. In addition, according to FactSage calculations, the high content of metallic iron reduced in the H2 atmosphere raised the softening temperature of the primary slag. It also narrowed and moved downward the cohesive zone due to an increase in softening and melting temperatures. Meanwhile, the increase in basicity promoted the decrease in liquid ratio and improved the permeability of cohesive zone.

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Acknowledgements

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Nos. U1960205 and 51804024).

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Authors and Affiliations

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

    Bin-bin Lyu, Guang Wang, Lian-da Zhao, Hai-bin Zuo, Qing-guo Xue & Jing-song Wang

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  1. Bin-bin Lyu
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  2. Guang Wang
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  3. Lian-da Zhao
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Correspondence to Guang Wang or Jing-song Wang.

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Lyu, Bb., Wang, G., Zhao, Ld. et al. Effect of atmosphere and basicity on softening–melting behavior of primary slag formation in cohesive zone. J. Iron Steel Res. Int. 30, 227–235 (2023). https://doi.org/10.1007/s42243-022-00830-3

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