Abstract
The reduction process of chromium-bearing vanadium–titanium sinter (CVTS) was studied under the simulated conditions of a blast furnace at 1173 K, and the kinetics and mineral phases were analyzed. The reduction kinetics of CVTS at different reduction times was studied using a shrinking unreacted core model. The microstructure, mineral phase and variations of the sinter during reduction were observed by x-ray diffraction, scanning electron microscopy and metallographic microscope. Results indicate that the porosity of the CVTS increased with the reduction time and that the reduction rate and degree of the CVTS both improved. Although internal diffusion resistance emerged during the reduction process and gradually increased, the interfacial reduction reaction controlled the entire process and was the rate-limiting factor. Increasing the ratio of microporosity in CVTS is found to be an effective way to improve both the reduction ability and the strength of the CVTS.
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Acknowledgements
This research was financially supported by the Programs of the National Natural Science Foundation of China (Nos. 51604065, 51674084, 51174051 and 51574082), the National Basic Research Program of China (973 Program) (No. 2013CB632603), the Fundamental Funds for the Central Universities (Nos. N172507012 and 150202001), the Program of the National Natural Science Foundation of Liaoning Province (20170540316) and the National Key Technology Research and Development Program (No. 2015BAB19B02), the Youth Fund of University of Science and Technology Liaoning (No. 2018QN05).
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Yang, S., Zhou, M., Xue, X. et al. Isothermal Reduction Kinetics of Chromium-Bearing Vanadium–Titanium Sinter Reduced with CO Gas at 1173 K. JOM 71, 2812–2820 (2019). https://doi.org/10.1007/s11837-019-03533-5
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DOI: https://doi.org/10.1007/s11837-019-03533-5