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

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 microstr...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2018-02, Vol.25 (2), p.145-152
Main Authors: Yang, Song-tao, Zhou, Mi, Jiang, Tao, Xue, Xiang-xin
Format: Article
Language:English
Subjects:
Ceramics
Characterization and Evaluation of Materials
Chemical reactions
Chemistry and Materials Science
Chromium
Chromium oxides
Composites
Corrosion and Coatings
Energy consumption
Experiments
Gases
Glass
Iron oxides
Kinetics
Materials Science
Metallic Materials
Metallurgy
Microscopy
Natural Materials
Phase transitions
Porosity
Scanning electron microscopy
Surfaces and Interfaces
Temperature
Thin Films
Titanium
Tribology
Vanadium
Vanadium oxides
X-ray diffraction
动力学理论
矿物质
泉华
钒钛
扫描电子显微镜
等温
气体
铬
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Summary: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 k J/mol. Phase transformations in CVTS reduction are as follows： Fe_2O_3→Fe_3O_4→FeO→Fe; Fe_2TiO_5→Fe_2TiO_4→FeTiO_3; FeO·V_2O_3→V_2O_3; FeO·Cr_2O_3→Cr_2O_3.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-018-1557-z