摘要
在真空条件下,采用等温法对碳热还原氧化锶的动力学进行了研究。研究结果表明:还原温度对碳热还原氧化锶的还原速度影响较大,温度越高,还原速度越大,在温度高于1573 K时,还原较快。根据Arrhenius方程计算出,在1473～1673 K范围内,当碳的气化反应为控制环节时,反应活化能为163.39 kJ·mol-1;界面化学反应为控制环节时,反应活化能为212.29 kJ·mol-1;气相扩散为控制环节时的活化能为315.00～384.46 kJ·mol-1。扩散控制反应时活化能最大,真空条件下碳热还原氧化锶的还原速度由气相扩散控制。
Vacuum thermal reduction kinetics of SrO pellets with graphite under the same temperature condition was studied. The re- sults showed that the effect of reduction temperature on reduction rate was remarkable, and the reduction rate increased with tempera- ture increasing, and the reduction rate was higher when the temperature was above 1573 K. The activation energies calculated with Ar- rhenius was 315.00 - 384.46 kJ ·mol^-1 under the control of gasification diffusion, and the activation energy was 163.39 kJ ·mol^-1 un- der the control of the boundary reaction of carbon, and the activation energy was 212.29 kJ·mol^-1 under the control of chemical reac- tion. The activation energy under the control of gasification diffusion was a maximum, so the gasification diffusion rate-determined step of the overall reduction process.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2013年第2期260-265,共6页
Chinese Journal of Rare Metals
基金
国家科技部973计划项目(2007CB613700)
国家大学生创新性实验计划项目(1210611007)资助
关键词
碳热还原
氧化锶
动力学
活化能
carbothermic reduction
SrO
kinetics
activation energy
