Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K

Song-tao Yang; Mi Zhou; Tao Jiang; Xiang-xin Xue

doi:10.1007/s12613-018-1557-z

Volume 25 Issue 2

Feb. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(2): 145-152

Song-tao Yang, Mi Zhou, Tao Jiang, and Xiang-xin Xue, Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K, Int. J. Miner. Metall. Mater., 25(2018), No. 2, pp. 145-152. https://doi.org/10.1007/s12613-018-1557-z

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Song-tao Yang, Mi Zhou, Tao Jiang, and Xiang-xin Xue, Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K, Int. J. Miner. Metall. Mater., 25(2018), No. 2, pp. 145-152. https://doi.org/10.1007/s12613-018-1557-z

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Research Article

Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K

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Corresponding author:
Xiang-xin Xue E-mail: xuexx@mail.neu.edu.cn
Received: 7 April 2017; Revised: 20 August 2017; Accepted: 28 September 2017

Abstract

Abstract

Reduction of chromium-bearing vanadium-titanium sinter (CVTS) was studied under simulated conditions of a blast furnace, and thermodynamics and kinetics were theoretically analyzed. Reduction kinetics of CVTS at different temperatures was evaluated using a shrinking unreacted core model. The microstructure, mineral phase, and variation of the sinter during reduction were observed by X-ray diffraction, scanning electron microscopy, and metallographic microscopy. Results indicate that porosity of CVTS increased with temperature. Meanwhile, the reduction degree of the sinter improved with the reduction rate. Reduction of the sinter was controlled by a chemical reaction at the initial stage and inner diffusion at the final stage. Activation energies measured 29.22-99.69 kJ/mol. Phase transformations in CVTS reduction are as follows:Fe₂O₃→Fe₃O₄→FeO→Fe; Fe₂TiO₅→Fe₂TiO₄→FeTiO₃; FeO·V₂O₃→V₂O₃; FeO·Cr₂O₃→Cr₂O₃.
- sinter;
- kinetics;
- reduction;
- mineral phase

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References

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