摘要
本文在真空条件下碳还原氧化镁行为的热力学和动力学进行研究。热力学研究表明,氧化镁真空碳热还原反应是C直接还原MgO,动力学研究表明,氧化镁真空碳热还原反应机理符合界面化学反应模型,动力学方程为1-(1-α)^(1/3)= 0.192e^(-221400/RT)t,表观活化能E=221.4kJ·mol^(-1)。
The thermodynamic and kinetic characteristics of the carbothermic reactions-a thermic chemical reactions which use carbon as the reducing agent at high temperature of magnesia under vacuum conditions were studied.The results show that magnesia is directly reduced by carbon instead of CO,and that the reaction at the interface of carbon and magnesia accounts for the carbothermic reduction in vacuum.The kinetic equation was expressed as1-(1-α)^(1/3)= 0.192 e^(-221400/RT) t,with an apparent activation energy,E=221.4kJ·mol^(-1).The strengths and weaknesses of the carbothermic reduction of magnesia in vacuum were also tentatively discussed.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2009年第S1期68-71,共4页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金-云南联合基金(U0837604)
云南省应用基础研究(No.200827023)
昆明理工大学科学研究基金(No.2008-06)资助
关键词
氧化镁
碳热还原
动力学
热力学
Magnesia
Carbothermic reduction
Kinetics
Thermodynamics
