Reduction Kinetics of Vanadium Titano-Magnetite Carbon Composite Pellets Adding Catalysts Under High Temperature

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• 作者：Jian-liang ZHANG ^{zhang@metall.ustb.edu.cn}Author Vitae ; Xiang-dong XING ; ^{xaxingxiangdong@163.com} ; Ming-ming CAO ; Ke-xin JIAO ; Chun-long WANG ; Shan REN
• 关键词：carbon composite pellet ; reduction kinetic ; catalyst ; vanadium titano-magnetite
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：20
• 期：2
• 页码：1-7
• 全文大小：898 K

文摘

Experiments were carried out by adding CaF₂ and NaF as catalysts in an Ar atmosphere to study the isothermal reduction kinetics of vanadium titano-magnetite carbon composite pellets under high temperature in the range from 1 473 to 1 673 K. The scanning electron microscope (SEM) was used to characterize the microstructure of product. By analyzing reduction mechanism, it was found that the rate controlling step was gas diffusion, and the activation energy was 178. 39 kJ/mol without adding any catalysts. Adding CaF₂ or NaF of 3 % to vanadium titano-magnetite carbon composite pellets can decrease the apparent activation energy of reduction, and the decrease extent was 14. 95 and 15. 79 kJ/mol, respectively. In addition, temperature was an important factor influencing on reaction rate.