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| Three-segment control theory of MgO/Al2O3 ratio based on viscosity experiments and phase diagram analyses at 1500 °C |
| Xin Jiang1, Huai‑yu Zhang1, Hai‑yan Zheng1, Qiang‑jian Gao1, Feng‑man Shen1 |
| 1 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract In recent years, more and more high Al2O3 iron ores were used in East Asia, especially in China, which increased the Al2O3 content in blast furnace (BF) slag and resulted in poor metallurgical properties of slag. Adding MgO-bearing flux is one of the methods to improve the metallurgical properties of slag with high Al2O3. However, there is lack of theoretical basis for the proper MgO/Al2O3 ratio. Therefore, the properties of slag in SiO2–CaO–MgO–Al2O3 system were investigated based on viscosity experiments and phase diagram analyses at 1500 °C, and the proper MgO/Al2O3 ratio was explored according to the Al2O3 content in slag. The experimental results show that: (1) in the case of Al2O3 content less than 14 mass%, there is no limitation of the MgO/Al2O3 ratio, and the amount of MgO in slag can be determined according to the hearth temperature and desulfurization; (2) in the case of Al2O3 content between 15 and 17 mass%, the proper MgO/Al2O3 ratio should be 0.40–0.50; (3) in the case of Al2O3 content between 18 and 20 mass%, the proper MgO/Al2O3 ratio should be 0.45–0.55. Consequently, the three-segment control theory of MgO/Al2O3 for BF slag was built, and the actual BF performances proved the validity and applicability of this theory. The research contents and results can give theoretical guidelines for stable BF operation in a wide range of Al2O3 content of 12–20 mass%.
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Received: 18 April 2019
Published: 25 June 2020
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| Cite this article: |
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Xin Jiang,Huai‑yu Zhang,Hai‑yan Zheng, et al. Three-segment control theory of MgO/Al2O3 ratio based on viscosity experiments and phase diagram analyses at 1500 °C[J]. Journal of Iron and Steel Research International, 2020, 27(6): 624-630.
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| [1] |
Yu-zhu Pan, Hai-bin Zuo, Jing-song Wang, Qing-guo Xue, Guang Wang, Xue-feng She. Review on improving gas permeability of blast furnace[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(2): 121-131. |
| [2] |
Qi Wang, Ji-an Yang, Chen Zhang, De-xiang Cai, Jian-qiang Zhang, Oleg Ostrovski. Effect of CaO/Al2O3 ratio on viscosity and structure of CaO–Al2O3-based fluoride-free mould fluxes[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(4): 374-384. |
| [3] |
De-xiang Cai, Wan-lin Wang, Lei Zhang, Chen Zhang. A comparison study on viscosity and heat transfer property of fluorine-bearing and fluorine-free mold flux for casting silicon steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(4): 385-392. |
| [4] |
Zhi-yuan Chen, Ying-xia Qu, Christiaan Zeilstra, Jan Van Der Stel, Jilt Sietsma, Yong-xiang Yang. Prediction of density and volume variation of hematite ore particles during in-flight melting and reduction[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(12): 1285-1294. |
| [5] |
Mao-guo Xiao, Xin-yang Lu, Dong-hui Li, Shao-hong Li, Kun-yu Zhao, Mao-sheng Yang. Carbides precipitation and their evolution of Cr15Co10Mo5-alloyed heat-resistant bearing steel after tempering at different temperatures[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(10): 1096-1105. |
| [6] |
Hong-tao Wang,Wei Zhao,Man-sheng Chu,Cong Feng,Zheng-gen Liu,Jue Tang. Current status and development trends of innovative blast furnace ironmaking technologies aimed to environmental harmony and operation intellectualization[J]. Chinese Journal of Iron and Steel, 2017, 24(8): 751-769. |
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2020, Vol. 27 
