Fe3O4内配石墨球团的还原动力学

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。

Reduction Kinetics of Fe3O4-Graphite Mixed Pellet

Experiments were carried out to investigate the reducibility of Fe3O4-graphite mixed pellets at a moderate temperature.The temperature was designed as 950~1 100 ℃ and the duration was shorter than 35 min.The kinetics parameters of pellets were calculated by means of the new kinetics equation(PKV equation).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 respectively prior to and after 19 min.The controlling unit presents the carbon gasification reaction prior to 19 min and the reduction of Fe3O4 by CO after 19 min.