Modification of MgO-CaO Clinkers for Hydration Resistance

doi:10.19691/j.cnki.1004-4493.2025.01.002

China's Refractories ›› 2025, Vol. 34 ›› Issue (1): 12-17.DOI: 10.19691/j.cnki.1004-4493.2025.01.002

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Modification of MgO-CaO Clinkers for Hydration Resistance

SHE Aixin^1#, LI Ningbo^1#, HUANG Ren¹, HUANG Zhong^{1, 2*}, ZHANG Haijun¹

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 University of Science and Technology, Wuhan 430081, China

Online:2025-03-15 Published:2025-03-27
Contact: *e-mail: huangzhong@wust.edu.cn
About author:She Aixin, graduated from Dalian University in June 2023, is now a graduate student in the Department of Materials, Wuhan University of Science and Technology, under the guidance of Associate Professor Huang Zhong. Her main research field is high-temperature ceramic.
^#The authors contributed equally to this work.

Abstract

Abstract: MgO-CaO refractories are widely used in the iron and steel metallurgy industry due to their advantages of purifying molten steel, high refractoriness, good thermal shock resistance, and excellent corrosion resistance to basic slags. However, hydration occurs during the manufacturing, storage, and transportation of refractories, which severely limits their application. MgO-CaO clinker is the main raw material for MgO-CaO refractories, and its hydration resistance determines the development of the latter case. Herein, the MgO-CaO clinker was modified using myristic acid as the modifying agent by the liquid-phase deposition method. The effects of the particle size of the raw materials, concentration of myristic acid, treatment temperature and time on the phase composition and hydration resistance of the modified MgO-CaO clinkers were investigated in detail. The results show that the samples with an agent concentration of 0.25 mol·L^-1 and treated at 25 °C for 1 h exhibit the optimal hydration resistance properties, namely a low hydration mass gain rate (0.23%) and a large water contact angle (152.9°).

Key words: MgO-CaO clinkers, surface modification, liquid-phase deposition method, hydration resistance

SHE Aixin, LI Ningbo, HUANG Ren, HUANG Zhong, ZHANG Haijun. Modification of MgO-CaO Clinkers for Hydration Resistance[J]. China's Refractories, 2025, 34(1): 12-17.

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Modification of MgO-CaO Clinkers for Hydration Resistance

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