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Mechanism of Low-Temperature Reduction Degradation of Alumina-Containing Hematite Solid Solution Below 550 °C

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Abstract

Low-temperature reduction degradation (LTRD) of sinter has an adverse effect on blast furnace permeability, and it is mainly caused by the stress produced in the reduction process of hematite. This stress is strongly influenced by alumina dissolved in hematite crystal lattice. In this work, the experiments were conducted to investigate the effect of alumina dissolved in hematite solid solution (Hss) on LTRD by reducing Hss below 550 °C. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), and optical microscope have been used to characterize the mass change and mineral change of samples, respectively. Jade software has been used to calculate the micro strain in magnetite for quantitatively studying the change of strain in reducing process. The results show that alumina was unfavorable to the reduction of Hss on thermodynamics, and the starting reduction temperature of Hss containing 6.0 mol pct alumina was 28 °C higher than that of pure hematite. According to the calculation on kinetics, the generation rate of stress was accelerated by dissolving alumina into hematite crystal lattice. The apparent activation energy of reduction reaction lowered from 47.89 to 28.07 kJ/mol with the increase of alumina content from 0.0 to 6.0 mol pct. The addition of alumina also increased the stress in the reduction products, and this stress was released in the form of LTRD.

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Acknowledgments

The authors are grateful to the National Natural Science Foundation of China (U1460201 and No. 51774029) for the financial support of this research.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing, 100083, P.R. China

    Hui Guo & Xing-Min Guo

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  1. Hui Guo
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  2. Xing-Min Guo
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Correspondence to Xing-Min Guo.

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Manuscript submitted June 28, 2018.

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Guo, H., Guo, XM. Mechanism of Low-Temperature Reduction Degradation of Alumina-Containing Hematite Solid Solution Below 550 °C. Metall Mater Trans B 49, 3513–3521 (2018). https://doi.org/10.1007/s11663-018-1426-1

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  • DOI: https://doi.org/10.1007/s11663-018-1426-1

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