中南大学学报（自然科学版）2025，Vol.56Issue(8)：3139-3151,13.DOI:10.11817/j.issn.1672-7207.2025.08.005
磁铁矿氢气还原过程的等温和非等温动力学机理研究
Kinetic mechanism analysis of isothermal and non-isothermal reduction of magnetite in hydrogen atmosphere
摘要
Abstract
The modem thermal analysis techniques was employed to systematically investigate the reduction kinetic behavior of magnetite particles in an H2/N2 mixture.The primary focus was on elucidating the influence patterns of critical parameters,such as reduction temperature,particle size,and hydrogen flow rate.Non-isothermal kinetic parameters for the hydrogen reduction of magnetite were determined using model-free methods.Additionally,mechanism functions for reduction reactions at varying hydrogen flow rates were established based on the principles of isothermal thermal analysis kinetics.The research findings indicate that during the non-isothermal reduction of magnetite with hydrogen,the reaction activation energy exhibits a characteristic pattern of initially decreasing and then increasing.Specifically,during the initial stage(reduction degree α=0.1-0.6),the activation energy decreases from 112.4 kJ/mol to 75.1 kJ/mol.As the process progresses to the middle-to-late stage(α＞0.6),the activation energy rebounds to 144.4 kJ/mol.The isothermal reduction process of magnetite adheres to a nucleation and growth model(A1,mechanism function G(α)=-ln(l-α)),demonstrating a model correlation coefficient(R2)greater than 0.969 at hydrogen flow rates ranging from 20 to 80 mL/min.These findings provide valuable insights into the reduction kinetic mechanism of magnetite under complex atmospheric conditions,offering a theoretical foundation for the development of hydrogen-based direct reduction technology in the iron and steel industry.关键词
磁铁矿/动力学/还原度/氢气还原/机理函数Key words
magnetite/kinetics/reduction degree/hydrogen reduction/mechanism function分类
矿业与冶金引用本文复制引用
黄金堤,李静,易涛,李明周,刘付朋,汪金良..磁铁矿氢气还原过程的等温和非等温动力学机理研究[J].中南大学学报（自然科学版）,2025,56(8):3139-3151,13.基金项目
中国宝武低碳冶金创新基金资助项目(BWLCF202121) （BWLCF202121）
江西理工大学清江青年英才支持计划项目(JXUSTQJYX2020016) （JXUSTQJYX2020016）
江西理工大学高层次人才科研启动项目(205200100517) （205200100517）
高性能钢铁合金材料江西省重点实验室计划项目(2024SSY05041)(Project(BWLCF202121)supported by the China Baowu Low Carbon Metallurgy Innovation Foundation （2024SSY05041）
Project(JXUSTQJYX2020016)supported by the Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology （JXUSTQJYX2020016）
Project(205200100517)supported by the Scientific Research Foundation of Jiangxi University of Science and Technology （205200100517）
Project(2024SSY05041)Supported by Jiangxi Provincial Key Laboratory of High-Performance Steel and Iron Alloy Materials) （2024SSY05041）
