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Effect of atmosphere and basicity on softening–melting behavior of primary slag formation in cohesive zone |
Bin-bin Lyu1, Guang Wang1, Lian-da Zhao1, Hai-bin Zuo1, Qing-guo Xue1, Jing-song Wang1 |
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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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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Cite this article: |
Bin-bin Lyu,Guang Wang,Lian-da Zhao, et al. Effect of atmosphere and basicity on softening–melting behavior of primary slag formation in cohesive zone[J]. Journal of Iron and Steel Research International, 2023, 30(02): 227-235.
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