Fe_3O_4内配石墨球团的还原动力学  

Reduction Kinetics of Fe_3O_4-Graphite Mixed Pellet

作　　者：周兰花[1] 伍维根[1] 张树立[1] 杨绍利[1] 

机构地区：[1]攀枝花学院,四川攀枝花617000

出　　处：《有色金属（冶炼部分）》2012年第8期1-3,10,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51174122)

摘　　要：开展了Fe3O4内配石墨球团还原试验,以考察球团的中温还原性。设定温度950～1 100℃,时间低于35min。并采用新建立的还原动力学方程(PKV方程)计算球团的动力学参数。结果表明,球团的还原能力随时间、温度的提高而增加,初始时间段及较低温度下增加幅度相对较大;温度对球团的还原影响很大。球团在19min前后的活化能分别为102.046kJ/mol和86.872kJ/mol。控制环节为界面化学反应,前19min为碳的气化反应,后19min为CO还原Fe3O4。Experiments were carried out to investigate the reducibility of Fe304-graphite mixed pellets at a moderate temperature. The temperature was designed as 950-1100℃ and the duration was shorter than 35 min. The kinetics parameters of pellets were calculated by means of the new kinetics equation （PKV e-quation）. The results show that strengthening with the increase of time and temperature, the reduction degree of pellets rises more rapidly at a lower temperature in the beginning and temperature has great effect on pellet reduction. The activation energy of the mixed pellets is 102. 046 kJ/mol and 86. 872 kJ/mol re-spectively prior to and after 19 rain. The controlling unit presents the carbon gasification reaction prior to 19 min and the reduction of Fe304 by CO after 19 rain.

关 键 词：球团 动力学 直接还原 

分 类 号：TF55[冶金工程—钢铁冶金]