Enhanced slag resistance and mechanical properties of magnesia castables with strontium carbonate addition

doi:10.1007/s42243-022-00909-x

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Abstract Magnesia castables have been widely used in metallurgical industries with the advantages of high refractoriness, nonpolluting steel, and resistance to alkaline slag. Magnesia castables were prepared using strontium carbonate (SrCO₃) as additive to enhance slag resistance and mechanical properties, and the influence of SrCO₃ on the evolution of phases, microstructure and properties of magnesia castables sintered at different temperatures was clarified. The results show that, with the introduction of SrCO₃ (lower than 3 wt.%), elastic modulus, mechanical strength, thermal shock resistance and densification of magnesia castables were significantly enhanced owing to the formation of needle-like Ca_0.9Sr_0.1MgSi₂O₆ phase and liquid phase when sintering at high temperatures, and the introduced SrCO₃ presented minor effects on the mechanical properties of castables for its highly structural stability below 1100 °C. During the slag corrosion process, SrCO₃ and SiO₂in castables reacted with Al³⁺ in molten slag to form SrAl2SiO8 phase, resulting in the increased slag viscosity and suppressed continuing penetration.

Key words： Magnesia castable SrCO3 Microstructure Slag resistance Mechanical property

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	Articles by authors
	Hao Liu
	Yu-xuan Zhu
	Zhou-fu Wang
	Yan Ma
	Xi-tang Wang

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Hao Liu,Yu-xuan Zhu,Zhou-fu Wang, et al. Enhanced slag resistance and mechanical properties of magnesia castables with strontium carbonate addition[J]. Journal of Iron and Steel Research International, 2023, 30(10): 2021-2030.