Effect of Coal Gangue Powder Addition on Porous Magnesia Aggregates Prepared from Magnesite Tailings

doi:10.19691/j.cnki.1004-4493.2026.03.004

China's Refractories ›› 2026, Vol. 35 ›› Issue (3): 17-22.DOI: 10.19691/j.cnki.1004-4493.2026.03.004

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Effect of Coal Gangue Powder Addition on Porous Magnesia Aggregates Prepared from Magnesite Tailings

WANG Qianqian, ZAN Wenyu, MA Beiyue^*, YUAN Xiaozhou, LAN Zhipeng, YU Jingkun

Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, China

Received:2026-07-15 Published:2026-09-29
Contact: *e-mail: maceramic@126.com
About author:Wang Qianqian, born in 2000, received her master’s degree in metallurgical engineering from Northeastern University. She is now a process engineer. Her research focuses on carbon-containing refractories and low-carbon magnesia carbon materials.

Abstract

Abstract: To enhance the resource utilization of magnesite tailings and reduce the production cost of magnesia-based refractories, porous MgO-Mg₂SiO₄-MgAl₂O₄ aggregates were synthesized in-situ using magnesite tailings and coal gangue powder as raw materials, firing at 1 300 °C for 4 h. The effects of the coal gangue powder additions (0, 10%, 20%, 30%, and 40%, by mass) on the phase composition, microstructure, bulk density, apparent porosity, cold crushing strength, and thermal shock resistance of the specimens were investigated. The results show that: (1) with the increase of the coal gangue powder addition, the linear shrinkage of the specimens first decreases and then increases, the volume shrinkage and the apparent porosity decrease, the bulk density and the cold crushing strength increase, and the crushing strength retention ratio first increases and then declines; (2) when the coal gangue powder addition is 30%, the specimen primarily consists of the crystalline phases of MgO, Mg₂SiO₄, and MgAl₂O₄, showing the optimal comprehensive performance: a linear shrinkage of 12.7%, a volume shrinkage of 30.5%, an apparent porosity of 43.4%, a bulk density of 1.84 g·cm^-3, a cold crushing strength of 56.0 MPa, and a crushing strength retention ratio of 83.3% after 3 thermal shocks.

Key words: magnesite tailings, coal gangue, porous aggregates, magnesium aluminate spinel, forsterite

WANG Qianqian, ZAN Wenyu, MA Beiyue, YUAN Xiaozhou, LAN Zhipeng, YU Jingkun. Effect of Coal Gangue Powder Addition on Porous Magnesia Aggregates Prepared from Magnesite Tailings[J]. China's Refractories, 2026, 35(3): 17-22.

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Effect of Coal Gangue Powder Addition on Porous Magnesia Aggregates Prepared from Magnesite Tailings

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