Kinetics and mechanism of coal-based direct reduction of highchromium vanadium-titanium magnetite
作者机构：School of Information Science and EngineeringNortheastern UniversityShenyang 110819LiaoningChina School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina School of Materials and MetallurgyUniversity of Science and Technology LiaoningAnshan 114051LiaoningChina
出 版 物：《Journal of Iron and Steel Research(International)》 (钢铁研究学报（英文版）)
年 卷 期：2022年第29卷第11期
页 面：1723-1733页
核心收录：
学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 0703[理学-化学] 0702[理学-物理学]
基 金：the support from the National Natural Science Foundation of China(Nos.52074081 and 52174319) the National Key Research and Development Plan(No.2021YFC290IOOO).
主 题：High-chromium vanadium-titanium magnetite Direct reduction Reduction rate Kinetic Thermodynamic Analysis
摘 要：High-chromium vanadium-titanium magnetite(HCVTM)is a valuable resource containing metal elements such as iron,vanadium,titanium,and chromium.To recycle these elements,direct reduction is an efficient way.The mechanism and reaction kinetic parameters for the direct reduction of HCVTM were studied.Experimental results show that the reduction degree increases obviously when the C/O ratio and temperature increase.Thermodynamic analysis showed a dramatic mass loss in the direct reduction of HCVTM in the temperature range of 985-1160℃.From 1200 to 1350℃,the reduction curves for the isothermal reduction of HCVTM followed the same trend,with a sharp increase in the initial reaction zone and a slight increase in the reduction rate with increasing time,and finally,the isothermal reduction process of HCVTM was divided into several limiting stages with varying degrees,with inconsistent limiting factors for the reaction rate at different stages.The results also show that the activation energy decreases slightly at larger degrees of reduction.Also,the apparent rate constant k(T)increased with increasing reduction temperature,with lnk(T)showing a good linear relationship with temperature.
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