Novel mode for mineralization and its sintering performance of vanadiferous titanomagnetites

Abstract

Different vanadiferous titanomagnetites commonly show different sintering performance and the underlying reason is the difference in mineralization behavior. In this work, a mineralization mode for vanadiferous titanomagnetites sintering was developed and mineralization behavior for vanadiferous titanomagnetites was compared by thermodynamic analyses. Besides, the sintering performance was clarified by substitution for each other. The results indicate that sintering performance shows an excellent correlation with mineralization behavior in the novel mineralization mode. The difference in mineralization behavior and sintering performance of vanadiferous titanomagnetites was attributed to the discrepancies in TiO₂ and SiO₂ content, and a higher SiO₂ content was able to offset the negative impact of TiO₂ at a fixed basicity. As the TiO₂ content in titanomagnetite increased from 1.53% to 4.30% with a similar SiO₂ content, the liquid phase amount, mechanical strength, calcium ferrite in the liquid phase, and reduction disintegration performance of sinter decreased significantly. However, when ilmenite with TiO₂ and SiO₂ contents of 7.99% and 3.86% was used to replace ilmenite with TiO₂ and SiO₂ contents of 4.30% and 2.12%, the reduction disintegration index decreased by less than 4%. The strength of sinter increased by 1.60%, and the yield increased by 2.56%.

Keywords

mineralization mode / titanomagnetite / iron ore sintering / reduction disintegration index / perovskite

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