Effect of SiO2 mass ratio on high-Ti vanadium titanomagnetite sintering at basicity of 2.0

Peng Hu; Jun-jie Zeng; Yu-xiao Xue; Rui Wang; Yong-da Li; Ning-yu Zhang; Shuo Zhang; Xue-wei Lv

doi:10.1007/s42243-025-01449-w

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Journal of Iron and Steel Research International ›› 2025, Vol. 32 ›› Issue (4) : 849-860. DOI: 10.1007/s42243-025-01449-w

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Effect of SiO₂ mass ratio on high-Ti vanadium titanomagnetite sintering at basicity of 2.0

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Abstract

The effect of (CaO+SiO₂) mass ratio on high-Ti vanadium titanomagnetite sintering was systematically studied at the fixed basicity (CaO/SiO₂) of 2.0. The results show that sinter matrix strength is improved with (CaO + SiO₂) mass ratio while the total iron content is reduced. Thermodynamic analysis indicates that the increase in (CaO + SiO₂) mass ratio from 15.0 to 22.5 wt.% contributes to the formation of liquid phase, especially silico-ferrite of calcium and aluminum (SFCA). In addition, the formation of perovskite is inhibited and liquid phase fluidity is improved. The porosity of sinter matrix is reduced by 34.5% and SFCA amount is increased by 47.2% when (CaO + SiO₂) mass ratio is increased from 15.0 to 18.0 wt.%. With the further increase in (CaO + SiO₂) mass ratio, the structure of sinter matrix is too dense and the improved extent of SFCA amount is increasingly low. The appropriate (CaO + SiO₂) mass ratio should be 18.0 wt.% overall. Under this condition, sinter matrix strength is greatly improved by over 13.5% compared with the base case and the total iron content can be maintained at about 49 wt.%.

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High-Ti vanadium titanomagnetite / (CaO+SiO₂) mass ratio / Sintering process / Liquid phase formation / Consolidation characteristics

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Peng Hu, Jun-jie Zeng, Yu-xiao Xue, et al. Effect of SiO₂ mass ratio on high-Ti vanadium titanomagnetite sintering at basicity of 2.0[J]. Journal of Iron and Steel Research International, 2025, 32(4): 849-860 https://doi.org/10.1007/s42243-025-01449-w

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