Whats The Effect of TiO2 on the Sintering Behavior of LVTM? (Material Science / Engineering)

By using sintering pot tests, X-ray diffraction (XRD), scanning electron microscopy (SEM), and mineral phase microanalysis, Songtao Yang and colleagues investigated the effects of TiO2 on the metallurgical properties, microstructure, and mineral composition of Low-grade vanadiferous titanomagnetite ore (LVTM) sinter. They found that the lower the TiO2 content, the better the quality of the sinter. Their study recently appeared in the Journal Materials.

Low-grade vanadiferous titanomagnetite ore (LVTM) is as an important mineral resource for sintering ore manufacturing. Furthermore, TiO2 has a significant effect on the sintering process of iron ore fines. But, the sintering behaviours with a relatively higher TiO2 content have not been studied comprehensively. Therefore, it is necessary to investigate the sintering behaviour of LVTMs with high titanium dioxide content.

Thus, Songtao and colleagues explored the effect of TiO2 on the sintering behavior of LVTM. First, they examined the yield (+5 mm), weight loss, flame front speed, productivity, tumbler index (TI), reduction degradation index (RDI), reduction index (RI), and softening properties. Later, they studied mineral compositions and microstructures of the LVTM sinter with different TiO2 contents. Furthermore, they evaluated the sinter with different TiO2 content.

Figure 1. Metallurgical properties of the sinter with various TiO2 contents:(a) RI, (b) RDI, (c) TI. © Songtao Yang et al.

They showed that, as the TiO2 content increased from 1.75% to 4.55%, the flame front speed and productivity decreased, while the reduction degradation index (RDI) and softening properties deteriorated. In addition, the tumbler index (TI) values reached a maximum at TiO2 = 1.75% i.e. it also decreased while, the Reduction Index (RI) improved.

They also showed that, the mineral composition of the LVTM sinter changed considerably when the TiO2 content was varied. As the TiO2 content increased, the magnetite and perovskite phases increased, while the calcium ferrite and hematite phases decreased.

Figure 2. Comprehensive evaluation results of the sinter with different TiO2 contents. © Songtao Yang et al.

Finally, it has been shown that, as the TiO2 content increased, the comprehensive index of the sinter decreased.

“In our study, the appropriate TiO2 content was 1.75%.”

Thus, the lower the TiO2 content, the better the quality of the sinter.

Featured image: Schematic of sintering pot test equipment © Songtao Yang et al.


Reference: Yang, S.; Tang, W.; Xue, X. Effect of TiO2 on the Sintering Behavior of Low-Grade Vanadiferous Titanomagnetite Ore. Materials 2021, 14, 4376. https://doi.org/10.3390/ma14164376


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