钒钛铁精矿内配碳球团直接还原的动力学  

Kinetics of Direction Reduction on Vanadium and Titanium Iron Concentrate Pellets Containing Carbon

作　　者：刘松利[1,2] 白晨光[1] 胡途[1] 吕学伟[1] 邱贵宝[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]攀枝花学院材料工程学院,四川攀枝花617000

出　　处：《钢铁研究学报》2011年第4期5-8,18,共5页Journal of Iron and Steel Research

基　　金：国家重点基础研究发展计划项目(2007CB613503)

摘　　要：采用等温还原试验并结合热力学反应数据,对钒钛铁精矿内配碳球团直接还原的还原反应进行了分析。以还原反应发生10 min为边界点,将反应过程分为前期和后期两个阶段,建立了还原过程的动力学模型。结果表明,钒钛铁精矿内配碳球团直接还原的还原度随反应温度的升高而增大。温度越高,球团在反应前期还原度的增加速率越大,达到的最终还原度越高,且达到最终还原度时所用的时间越短;还原前期为化学反应控制,反应活化能为73.17 kJ/mol。后期为扩散控制,反应活化能为152.02 kJ/mol。还原后期反应速度小于前期反应速度。Using isothermal reductive reaction experiment and data of thermodynamics,reduction reaction of vanadium and titanium iron concentrate pellets containing carbon was investigated.The reaction process was divided into two stages at the tenth minutes after reaction,and the dynamics model of reduction process were established.The experimental results show that the degree of reduction rises with the increasing of reaction temperature.The temperature is higher,the incremental rate of reduction-degree in the first step are bigger,and can achieve higher degrees of reduction;the reaction time up to final reduction degree is shorter.The first step is controlled by chemical reaction between the metal oxide and carbon,and the activation energy of the reduction process is 73.17kJ/mol.The later step is controlled by the diffusion of reduced products,and the activation energy of the reduction process is 152.02kJ/mol.Later reaction velocity is less than early reaction velocity.

关 键 词：动力学模型 转底炉 钒钛铁精矿 球团 直接还原 

分 类 号：TF55[冶金工程—钢铁冶金]