Preparation of SiO2-coated MgO Composite Powders by Sol-gel Method and Their Properties

doi:10.19691/j.cnki.1004-4493.2026.03.006

China's Refractories ›› 2026, Vol. 35 ›› Issue (3): 32-39.DOI: 10.19691/j.cnki.1004-4493.2026.03.006

Preparation of SiO₂-coated MgO Composite Powders by Sol-gel Method and Their Properties

ZHOU Zhangyan¹, CAO Jiyuan¹, MA Beiyue^1,*, LI Guangming², SONG Na², BAN Xia², LIU Yongli², ZHANG Chengcheng², ZHAO Guangyi³

1 Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, China;
2 Dashiqiao Meir Magnesium Products Co., Ltd., Yingkou 115199, China;
3 Liaoning Kezhi Magnesium New Materials Research Co., Ltd, Shenyang 110000, China;

Received:2026-03-15 Published:2026-09-29
Contact: *e-mail: maceramic@126.com
About author:Zhou Zhangyan, born in 1997, is a postgraduate of School of Metallurgy in Northeastern University. Her main research direction is the preparation and properties of magnesia-based refractories and functional coating. She has published nine academic papers as the first author in journals, and she has applied for 2 patents. She has won the National Scholarship and the First Prize of Technological Invention from the China Magnesite Material Association.

Abstract

Abstract: To address the challenges associated with the agglomeration of magnesia and its poor dispersion stability in sol systems, the effects of the sodium pyrophosphate additions (0-2.5 mass%), suspension pH (7.9-11.5), and ultrasonic dispersion time (0-20 min) on the dispersity and stability of the magnesia powder were investigated. Subsequently, SiO₂-coated magnesia powders were prepared using sodium silicate as the raw material through the sol-gel method. The influence of the coating time (1-9 h), coating temperature (55-95 °C), suspension pH value (7.5-11.3), and sodium silicate solution dosage (1%-5%) on the surface properties of the powders was studied. The results indicate that within certain ranges (the sodium pyrophosphate addition <1.5%, the pH <11.5, and the ultrasonic dispersion time >5 min), the dispersity of the magnesia powders improves with the above parameter values increasing; however, when the sodium pyrophosphate addition exceeds 1.5% and the ultrasonic dispersion time is shorter than 5 min, the dispersity gradually deteriorates. After being coated with SiO₂, as the coating time prolongs, the coating temperature increases from 55-65 °C, or the pH rises, the dispersity of the magnesia powders first increases and then decreases. Generally, under the following conditions: coating time of 7 h, coating temperature of 65 °C, pH of 10.5, and sodium silicate solution dosage of 5%, the magnesia powder exhibits the optimal dispersity, with d₅₀=45.2 μm, d₉₀=70.5 μm, and the minimum specific surface area of 792 m²·kg^-1.

Key words: magnesia, sol-gel method, SiO₂ coating, coating time, coating temperature

ZHOU Zhangyan, CAO Jiyuan, MA Beiyue, LI Guangming, SONG Na, BAN Xia, LIU Yongli, ZHANG Chengcheng, ZHAO Guangyi. Preparation of SiO₂-coated MgO Composite Powders by Sol-gel Method and Their Properties[J]. China's Refractories, 2026, 35(3): 32-39.

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Preparation of SiO₂-coated MgO Composite Powders by Sol-gel Method and Their Properties

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