Influence of Ladle Slag Addition on Properties of Al2O3-MgO Refractory Castables

doi:10.19691/j.cnki.1004-4493.2025.01.005

China's Refractories ›› 2025, Vol. 34 ›› Issue (1): 34-42.DOI: 10.19691/j.cnki.1004-4493.2025.01.005

Influence of Ladle Slag Addition on Properties of Al₂O₃-MgO Refractory Castables

XUE Junzhu^{1, 2, 3}, MIAO Zheng⁴, LIU Guangping³, WEI Guoping³, CHENG Yaping^{1, 2}, YAN Wen^{1, 2}, WEI Yaowu^{1, 2}, LI Nan^{1, 2}, CHEN Junfeng^{1, 2*}

1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Joint International Research Laboratory of Refractories and Metallurgy, Ministry of Education, Wuhan 430081, China
3 Zhejiang Zili Holdings Co.,Ltd., Shaoxing 312000, China
4 Hebei Guoliang New Materials Co.,Ltd, Tangshan 063021, China

Online:2025-03-15 Published:2025-03-27
Contact: *e-mail: chenjunfengref@wust.edu.cn
About author:Xue Junzhu obtained his bachelor’s and master’s degrees both in Materials Science at Wuhan University of Science and Technology, currently serving as the general manager and chief research and development engineer of Zhejiang Zili New Materials Co., Ltd. His research works mainly focus on the sintered alumina raw materials and their applications in the steelmaking process and energy industries.

Abstract

Abstract: The penetration of ladle slag into refractory linings is an essential process in service, and the mechanical properties of the refractory castables are affected by the location and content of slag in the refractory castables. In this work, ladle slag was added into Al₂O₃-MgO refractory castables and its influence on the microstructure evolution, mechanical properties and thermal shock resistance of the castables was investigated. The phase composition and contents of the castables during the corrosion process were calculated by FactSage TM (6.2) and studied. The results indicate that the residual strength decreases as the ladle slag addition increases from 0 to 6 mass%. While the hot modulus of rupture of the castable with 6% ladle slag significantly decreases by approximately 80% compared with the one without ladle slag. The elastic modulus and CMOR of the castables decrease with slag-adding, which leads to the increase of liquid phase contents inside the samples.

Key words: Al₂O₃-MgO castables, ladle slag, thermal shock resistance, microstructure

XUE Junzhu, MIAO Zheng, LIU Guangping, WEI Guoping, CHENG Yaping, YAN Wen, WEI Yaowu, LI Nan, CHEN Junfeng. Influence of Ladle Slag Addition on Properties of Al₂O₃-MgO Refractory Castables[J]. China's Refractories, 2025, 34(1): 34-42.

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Influence of Ladle Slag Addition on Properties of Al₂O₃-MgO Refractory Castables

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