高磷铁矿石含碳球团等温还原动力学  

Isothermal reduction kinetics of high-phosphorus iron ore carbon-containing pellets

作　　者：陈雯[1] 王鑫 雷鹰 李雨 何思奇 廖振鸿 CHEN Wen;WANG Xin;LEI Ying;LI Yu;HE Si-qi;LIAO Zhen-hong(Department of Mineral Resources Development and Utilization Technology,Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha 410012,Hunan,China;School of Metallurgical Engineering,Anhui University of Technology,Ma′anshan 243032,Anhui,China;Steel Structure Engineering Company,China Construction Eighth Engineering Division Steel Structure Engineering Co.,Ltd.,Shanghai 200135,China)

机构地区：[1]长沙矿冶研究院有限责任公司矿产资源开发利用技术研究所,湖南长沙410012 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]中国建筑第八局有限公司钢结构工程公司,上海200135

出　　处：《钢铁》2020年第9期11-15,共5页Iron and Steel

基　　金：国家自然科学基金资助项目(51574042,51974005)。

摘　　要：为了研究高磷铁矿石含碳球团等温还原动力学在温度为1173、1273、1323、1373、1423和1473K时,采用界面化学反应模型、Jander方程、Ginstling-Broushtein方程、G Valensi-R E Carter方程等固-固/气反应机理函数对反应过程进行拟合,并采用XRD、SEM、EDX等对样品的物相组成、微观形貌和元素分布进行表征分析。研究结果表明,随着还原程度提高,反应速率由0迅速增至最大值,随后逐渐减小并趋于平缓;当温度为1173~1373K时,反应过程符合界面化学反应,表观活化能为70.02kJ/mol,线性相关系数为0.9481;当温度为1373~1473K时,反应过程符合Jander方程,限制步骤为铁离子固相扩散,表观活化能为215.36kJ/mol,线性相关系数为0.9912。To study the isothermal reduction kinetics of high-phosphorus iron ore carbon-containing pellets,at the temperature of 1173,1273,1323,1373,1423 and 1473 K.Several solid-state reaction mechanism functions,i.e.interfacial chemical reaction model,Jander equation,Ginstling-Broushtein equation,and G Valensi-R E Carter equation were used to fitting the reduction reaction process.The phase,microstructure and elementary composition were characterized by using X-ray diffraction(XRD),Scanning electron microscope(SEM)and Energy Dispersive X-Ray Microanalysis(EDX)techniques.With the increase of the reduction degree,the reaction rate increased from zero to the maximum rapidly,and then gradually decreased and became flat.The reaction rates increase with increased temperature.At the temperature form 1173 to 1373 K,the reduction reactions are well fit to the interface chemical reaction model,the apparent activation energy and correlation coefficients are 70.02 kJ/mol and 0.9481 respectively;At the temperature form 1373 to 1473 K,the reduction reactions are well fit to the Jander model,the restrictive step is iron ion solid-state diffusion,the apparent activation energy,and correlation coefficients are215.36 kJ/mol and 0.9912 respectively.

关 键 词：高磷铁矿 含碳球团 木炭 还原动力学 拟合 

分 类 号：TF046.6[冶金工程—冶金物理化学]