摘要
采用等温动力学研究的方法在1100~1300℃下对攀枝花钛精矿真空碳热还原中铁的动力学进行了研究。研究结果表明:还原温度的升高和保温时间的延长,能促进钛精矿中Fe3O4的还原以及铁的聚集长大;钛精矿中的铁在1100~1250℃保温的前期即0~30 min时,还原反应受界面化学反应控制,反应的表观活化能为207.92 kJ/mol;在1100~1200℃保温的后期即30~90min时,还原反应受内扩散控制,反应的表观活化能为521.47 kJ/mol。
The kinetics of Fe,in vacuum carbonthermal reduction of(Panzhihua)ilmenite concentrate,was studied.The influence of the reduction temperature/time on the extraction/growth of Fe-clusters via reduction of Fe3O4 was investigated with X-ray diffraction,scanning electron microcopy and energy dispersive spectroscopy.The results show that the reduction temperature and time had a major impact.For example,as the reduction temperature and time increased,the reduction rate of Fe3O4 increased,accompanied by increasing accumulation and growth of Fe-clusters.Initially reduced at 1100-1250℃for 30 min,only surface/interfacial reduction happened,with apparent activation energy of 207.92 kJ/mol;but later reduced at 1100-1200℃for 30 min^90 min,strong bulk reduction dominated,with apparent activation energy of 521.47 kJ/mol,because of thermal diffusion of the contents involved.We suggest that the reduction sequence be FeTiO3→Fe2TiO4→FeTi2O5→Ti2O3.
作者
赵世翻
黄润
吕晓东
伍秦至
武庆慧
张金柱
Zhao Shifan;Huang Run;Lu Xiaodong;Wu Qinzhi;Wu Qinghui(Zhang Jinzhu,School of Materials and Metallurgy,Guizhou University,Guiyang 550025,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2020年第5期437-442,共6页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金地区项目(51664003)
贵州省科学技术厅-贵州理工学院科学技术联合基金项目(黔科合LH字【2016】7098)。
关键词
钛精矿
真空还原
动力学
活化能
Ilmenite concentrate
Vacuum reduction
Kinetics
Activation energy
