Fabrication and Improving Properties of Lightweight Al2O3-MgO Castables for Ladle Working Lining

doi:10.19691/j.cnki.1004-4493.2023.01.002

China's Refractories ›› 2023, Vol. 32 ›› Issue (1): 6-13.DOI: 10.19691/j.cnki.1004-4493.2023.01.002

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Fabrication and Improving Properties of Lightweight Al₂O₃-MgO Castables for Ladle Working Lining

WANG Zhiqiang^1,*, LEI Zhongxing¹, XU Guotao², PENG Xiaoqian¹, ZHU Boquan³, LIU Li², GUO Zongqi⁴

1 Wugang Refractory Co., Ltd., Wuhan 430080, China;
2 R&D Center of Wuhan Iron and Steel Co., Ltd., Baosteel Central Research Institute, Wuhan 430080, China;;
3 Wuhan University of Science and Technology, Wuhan 430081, China;
4 Xi'an University of Architecture and Technology, Xi'an 710055, China;

Online:2023-03-15 Published:2023-03-22
Contact: *e-mail: fairman888@163.com
About author:Wang Zhiqiang, professorship senior engineer, works as a chief engineer in Wugang Refractory Co., Ltd. now. In 2020 he received the Ph. D degree of material science and engineering from Wuhan University of Science and Technology. He engages in the research of high temperature ceramic materials, advanced refractory materials and advanced technology for ladles, tundishes and converters. He has published more than 30 articles, has more than 30 authorized patents and more than 5 provincial and ministerial science and technology awards so far.

Abstract

Abstract: Three lightweight Al₂O₃-MgO castables were fabricated with tabular alumina or microporous corundum as the aggregates, reactive α-Al₂O₃ micropowder, tabular alumina powder, and fused magnesia powder as the matrix, calcium aluminate cement as the binder, and MgO ultrafine powder (d₅₀=5.4μm) and Al(OH)₃ ultrafine powder (d₅₀=8.2μm) as additives. The influence of aggregates and ultrafine powders on the properties, including pore size distribution, heat conductivity, thermal shock resistance, and slag resistance of lightweight refractory castables was investigated. The results show that the incorporation of microporous corundum reduces the bulk density of Al₂O₃-MgO castables, and MgO and Al(OH)₃ ultrafine powders further increases the proportion of micropores in castables, which is beneficial to reducing the heat conductivity, and improving the thermal shock resistance and slag resistance of castables. Additionally, MgO ultrafine powder and Al(OH)₃ ultrafine powder increase the fluidity and the strength of castables.

Key words: lightweight alumina-magnesia castables, microporous corundum, ultrafine powder

WANG Zhiqiang, LEI Zhongxing, XU Guotao, PENG Xiaoqian, ZHU Boquan, LIU Li, GUO Zongqi. Fabrication and Improving Properties of Lightweight Al₂O₃-MgO Castables for Ladle Working Lining[J]. China's Refractories, 2023, 32(1): 6-13.

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Fabrication and Improving Properties of Lightweight Al₂O₃-MgO Castables for Ladle Working Lining

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