铁精粉氧化过程的动力学研究  

Kinetics study on oxidation of iron ore concentrate

作　　者：司新国[1,2] 鲁雄刚[1] 李传维[1] 郭曙强[1] 丁伟中[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072 [2]河北钢铁集团唐山钢铁股份有限公司,唐山063020

出　　处：《北京科技大学学报》2010年第7期905-909,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50774052);国家重点基础研究发展计划资助项目(No.2007CB613600);攀枝花市科学技术委员会资助项目(No.2008CY-G-6);上海大学第三届研究生创新基金资助项目(No.A16-0110-09-704)

摘　　要：通过恒温和均匀升温实验,采用大载荷热重分析仪研究了铁精粉氧化过程动力学.结果表明:均匀升温过程中,铁精粉氧化的主要控制环节变化是外扩散型→内扩散型→外扩散型,氧化结束后,部分Fe2O3发生分解反应生成Fe3O4和O2,使得TG曲线质量变化率减小;等温实验也证明了氧化主体部分的控制环节是内扩散,其表观活化能为26.193kJ.mol-1;铁精粉氧化过程促进了钛元素富集,改变了产物的微观结构.Isothermal and uniform temperature-rise experiments were done to study the oxidation kinetics of iron ore concentrate with a TG instrument. The results indicated that the major control unit of the oxidation process changed from out-diffusion to inner-diffusion,and out-diffusion finally during uniform temperature rise. After oxidation,partial hematite decomposed into magnetite and oxygen; as a result,the mass change ratio on the TG curve gradually decreases. The isothermal experiment also proves that the main step is inner-diffusion and the apparent activation energy of oxidation is 26.193 kJ·mol-1. Oxidation of iron ore concentrate accelerates titanium enrichment and changes the microstructure of oxidized products.

关 键 词：铁精粉 氧化 反应动力学 钛 扩散 

分 类 号：TF521.1[冶金工程—钢铁冶金]