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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。
Under vacuum conditions, the kinetics of carbothermal reduction of strontium oxide was studied by isothermal method. The results show that the reduction temperature has a great influence on the reduction rate of strontium oxide by carbothermal reduction. The higher the temperature is, the larger the reduction rate is, and the faster the reduction is at the temperature higher than 1573K. According to the Arrhenius equation, the reaction activation energy is 163.39 kJ · mol-1 when the gasification reaction of carbon is controlled in the range of 1473-1673 K. The reaction activation energy is 212.29 kJ · Mol-1. The activation energy of gas phase diffusion is 315.00 ~ 384.46 kJ · mol-1. The activation energy of diffusion control reaction is the largest, and the reduction rate of strontium oxide by carbothermal reduction under vacuum is controlled by gas diffusion.