添加V_2O_5催化制备碳化铁的动力学  

Study on Reaction Kinetics of Promoting Iron Carbide Formation by V_2O_5 Additive

作　　者：何强[1] 李光强[1] 马江华[1] 倪红卫[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《过程工程学报》2008年第S1期193-197,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金(编号:50674074)

摘　　要：研究了923～1073K的温度范围内,1%V_2O_5添加剂对70%(φ)H_2+30%(φ)CH_4与铁矿石反应的动力学.运用未反应核模型,求出了不同温度下反应的表观速率常数及反应的表观活化能.结果发现添加V_2O_5与否铁矿石还原阶段的反应活化能变化不大,表明添加V_2O_5对铁矿石的还原反应促进作用较弱;添加1%V_2O_5的试样碳化反应活化能由72 kJ/mol降低到46.5 kJ/mol,减少了35%,说明V_2O_5对铁碳化反应有较强的促进作用.From kinetics viewpoint,the effect of 1% V_2O_5 additive on reaction of iron ore with 70% H_2-30% CH_4 gas mixture was studied in 923～1073 K.Rate constant of the chemical reaction k_T~ and reaction activation energy E were calculated by experiment and applying the Shrinking core model.From the changes of rate constant and activation energy,it was observed that the V_2O_5 additive had weak promoting effect on the reduction reaction,as the value of the reaction activation energy had a little change after addi...

关 键 词：碳化铁 V_2O_5 动力学 活化能 

分 类 号：TF552[冶金工程—钢铁冶金]