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Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K
Alternative TitleIsothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K
Yang Songtao1; Zhou Mi1; Jiang Tao1; Xue Xiangxin1
2018
Source PublicationINTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
ISSN1674-4799
Volume25Issue:2Pages:145-152
AbstractReduction 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 center dot V2O3 -> V2O3; FeO center dot Cr2O3 -> Cr2O3.
Other AbstractReduction 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: 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.
KeywordCAO AND/OR MGO CARBON-MONOXIDE IRON-ORE ILMENITE MAGNETITE MECHANISM HYDROGEN BASICITY COMPACTS sinter kinetics reduction mineral phase
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Fundamental Funds for the Central Universities] ; [Natural Science Foundation of Liaoning Province] ; [China Postdoctoral Science Foundation] ; [NEU Postdoctoral Science Foundation]
CSCD IDCSCD:6196403
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/146614
Collection中国科学院金属研究所
Affiliation1.东北大学
2.Univ Sci & Technol Liaoning, Sch Materials & Met, Anshan 114051, Peoples R China
3.中国科学院金属研究所
Recommended Citation
GB/T 7714
Yang Songtao,Zhou Mi,Jiang Tao,et al. Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K[J]. INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS,2018,25(2):145-152.
APA Yang Songtao,Zhou Mi,Jiang Tao,&Xue Xiangxin.(2018).Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K.INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS,25(2),145-152.
MLA Yang Songtao,et al."Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K".INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS 25.2(2018):145-152.
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