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Influence of Basicity on High-Chromium Vanadium-Titanium Magnetite Sinter Properties, Productivity, and Mineralogy

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Abstract

The effect of basicity on high-chromium vanadium-titanium magnetite (V-Ti-Cr) sintering was studied via sintering pot tests. The sinter rate, yield, and productivity were calculated before determining sinter strength (TI) and reduction degradation index (RDI). Furthermore, the effect of basicity on V-Ti-Cr sinter mineralogy was clarified using metallographic microscopy, x-ray diffraction, and scanning electron microscopy-energy-dispersive x-ray spectroscopy. The results indicate that increasing basicity quickly increases the sintering rate from 25.4 mm min−1 to 28.9 mm min−1, yield from 75.3% to 87.2%, TI from 55.4% to 64.8%, and productivity from 1.83 t (m2 h)−1 to 1.94 t (m2 h)−1 before experiencing a slight drop. The V-Ti-Cr sinter shows complex mineral composition, with main mineral phases such as magnetite, hematite, silicate (dicalcium silicate, Ca-Fe olivine, glass), calcium and aluminum silico-ferrite (SFCA/SFCAI) and perovskite. Perovskite is notable because it lowers the V-Ti sinter strength and RDI. The well intergrowths between magnetite and SFCA/SFCAI, and the decrease in perovskite and secondary skeletal hematite are the key for improving TI and RDI. Finally, a comprehensive index was calculated, and the optimal V-Ti-Cr sinter basicity also for industrial application was 2.55.

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Acknowledgements

The authors are grateful to the National High Technology Research and Development Program of China (863 Program) (Grant No.2012AA062302 and 2012AA062304), the Program of the National Natural Science Foundation of China (Grant Nos. 51090384 and 51174051), and the program of the international cooperation of Ministry of Science and Technology Major of China (Grant No. 2012DFR60210) for support of this research.

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, People’s Republic of China

    Mi Zhou, Songtao Yang, Tao Jiang & Xiangxin Xue

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  1. Mi Zhou
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  2. Songtao Yang
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  3. Tao Jiang
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  4. Xiangxin Xue
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Correspondence to Mi Zhou.

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Zhou, M., Yang, S., Jiang, T. et al. Influence of Basicity on High-Chromium Vanadium-Titanium Magnetite Sinter Properties, Productivity, and Mineralogy. JOM 67, 1203–1213 (2015). https://doi.org/10.1007/s11837-015-1326-7

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  • DOI: https://doi.org/10.1007/s11837-015-1326-7

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