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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
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)
关键词
铁精粉
氧化
反应动力学
钛
扩散
iron ore concentrate
oxidation
reaction kinetics
titanium
diffusion
