高炉粉尘球团真空碳热还原过程中Zn还原动力学  

Kinetics Simulation of Zn Extraction from Dust Dried in Blast Furnace by Carbothermic Reduction in Vacuum

作　　者：张荣良[1] 李夏[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212003

出　　处：《真空科学与技术学报》2014年第1期53-59,共7页Chinese Journal of Vacuum Science and Technology

基　　金：江苏省自然科学基金资助项目(BK2009574)

摘　　要：根据"收缩核模型"和扩散理论研究了高炉粉尘球团真空碳热还原过程中Zn还原动力学。详细考察了系统压强、球团直径、还原温度对Zn还原率的影响。研究结果表明,碳气化和界面反应的表观活化能相对于锌蒸汽和CO气体的扩散表观活化能来说较小,其对Zn还原过程的影响较小,而气体扩散对Zn还原过程的影响较大,高炉粉尘球团真空碳热还原过程中Zn还原的控制步骤为内扩散,表观反应级数为1。在实验选取的温度范围内,反应的表观活化能为172.39 kJ/mol。根据研究结果,建立了Zn还原的宏观动力学方程。The Zn-extraction, from the pellet of dust dried in blast furnace （BF） by carbothemfic reduction in vacu- um, was modeled and calculated in kinetics theory. The impacts of the reduction conditions,including the pressure, pellet size, temperature, on the Zn reduction rate were evaluated. An increased Zn reduction rate was found to depend, to varying degrees, on a lower pressure, a smaller pellet size, and a higher reduction temperature, under the experimental conditions. The calculated results show that the diffusion of Zn vapor and CO has a major impact on Zn reduction, instead of the ap- parent activation energies of carbon gasification or interface reaction. In the 1023 to 1173 K range,favorable to internal diffusion of Zn, the apparent activation energy was calculated to be172.39 kJ/mol. The kinetic reaction equation was also derived.

关 键 词：真空碳热还原 动力学 高炉粉尘 锌 

分 类 号：TB79[一般工业技术—真空技术] TF813[冶金工程—有色金属冶金]