Effect of Reactive Alumina Addition on Properties of Reactive Magnesia Bonded Corundum-spinel Castables

doi:10.19691/j.cnki.1004-4493.2025.04.007

China's Refractories ›› 2025, Vol. 34 ›› Issue (4): 31-35.DOI: 10.19691/j.cnki.1004-4493.2025.04.007

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Effect of Reactive Alumina Addition on Properties of Reactive Magnesia Bonded Corundum-spinel Castables

GAO Guangze¹, ZHANG Hongrui¹, LI Jianwei², CHEN Liugang^1,*

1 Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China;
2 Henan Building Materials Research and Design Institute Co., Ltd, Zhengzhou 450052, China

Online:2025-12-15 Published:2026-01-04
Contact: *e-mail: gzgao@gs.zzu.edu.cn
About author:Gao Guangze, born in 2000. He received his bachelor’s degree from Henan University of Engineering in 2022. He pursued his master’s studies at the School of Materials Science and Engineering, Zhengzhou University, and conducted research in the Henan Key Laboratory of High Temperature Functional Ceramics, obtaining his master’s degree in 2025. His research focus is on the preparation and application of reactive MgO-bonded castables.

Abstract

Abstract: To enhance the performance, reactive MgO-bonded corundum-spinel castables were prepared using tabular corundum, reactive alumina, reactive MgO, and aluminum lactate as raw materials. The influence of the reactive alumina addition (0, 8%, 13%, and 18%, by mass) on the microstructure, phase composition, physical properties, as well as the resistance to slag corrosion and penetration of the castables was investigated. The results show that: (1) the reactive alumina promotes the sintering of the reactive MgO-bonded corundum-spinel castables, enhancing the bonding between aggregates and matrix, thus densifying the microstructure; (2) with the increase of the reactive alumina, the volume stability of the samples increases, the apparent porosity decreases, the bulk density increases, and the cold modulus of rupture and cold compressive strength as well as the slag resistance are improved; (3) the reactive MgO-bonded corundum-spinel castable with 18% reactive alumina shows optimal comprehensive performance, with the bulk density of 3.05 g·cm^-3, apparent porosity of 18.5%, permanent linear change rate after heating of 0.31%, cold modulus of rupture of 13.5 MPa and cold compressive strengths of 73.8 MPa, as well as the best slag resistance. However, considering particle size distribution and raw material costs, there is no need to further increase the reactive alumina addition.

Key words: reactive alumina micropowder, reactive magnesia, corundum-spinel castables, physical properties, slag resistance

GAO Guangze, ZHANG Hongrui, LI Jianwei, CHEN Liugang. Effect of Reactive Alumina Addition on Properties of Reactive Magnesia Bonded Corundum-spinel Castables[J]. China's Refractories, 2025, 34(4): 31-35.

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Effect of Reactive Alumina Addition on Properties of Reactive Magnesia Bonded Corundum-spinel Castables

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