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

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	Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K
其他题名	Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium-titanium sinter reduced with CO gas at 873-1273 K
	Yang Songtao 1; Zhou Mi 1; Jiang Tao 1; Xue Xiangxin 1
	2018
发表期刊	INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
ISSN	1674-4799
卷号	25 期号:2 页码:145-152
摘要	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 center dot V2O3 -> V2O3; FeO center dot Cr2O3 -> Cr2O3.
其他摘要	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: 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.
关键词	CAO AND/OR MGO CARBON-MONOXIDE IRON-ORE ILMENITE MAGNETITE MECHANISM HYDROGEN BASICITY COMPACTS sinter kinetics reduction mineral phase
收录类别	CSCD
语种	英语
资助项目	[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记录号	CSCD:6196403
引用统计	被引频次：2[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/146614
专题	中国科学院金属研究所
作者单位	1.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
推荐引用方式 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.