高温悬浮态下碳酸钙分解反应动力学的研究  

Research on the Decomposing Kinetics of Calcium Carbonate under High Temperature and Suspension State

作　　者：王俊杰[1] 颜碧兰[1] 汪澜[1] 徐迅[1,2] 

机构地区：[1]中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京100024 [2]西南科技大学材料科学与工程学院,绵阳621010

出　　处：《武汉理工大学学报》2013年第5期41-44,共4页Journal of Wuhan University of Technology

基　　金："973"计划项目(2009CB623102)

摘　　要：采用一维炉研究了高温悬浮态下碳酸钙的分解反应动力学问题。具体的研究方法是基于不同反应机理的积分函数,确定了悬浮态下碳酸钙的分解反应机理最大可能为单步随机成核与生长,并计算出其表观活化能为67.2kJ/mol,指前因子为65.5s-1。然后,对比分析了悬浮态和堆积态下碳酸钙的分解反应速率常数,研究结果表明,当煅烧温度小于1 035℃时,悬浮态下碳酸钙分解反应速率常数较堆积态要大,而当煅烧温度大于1 035℃时,则堆积态下反应速率常数较大。考虑堆积态下碳酸钙的升温时间,悬浮态下碳酸钙的分解时间远小于堆积态,例如,950℃时其完全分解需时11.11s,1 200℃时仅为3.70s。The decomposing kinetics of calcium carbonate under high temperature and suspension state was investigated in a one-dimension furnace.In terms of related integral equations,the reaction mechanism and kinetic parameters were obtained.The research results indicate that the decomposition process of calcium carbonate under suspension state is in according with one step random nucleation and growth mechanism,with apparent activation energy（Ea） 67.2 kJ/mol and pre-exponential factor（A） 65.5 s-1.Besides,the decomposition rate of calcium carbonate under suspension and accumulation state was calculated.The research results show that the decomposing rate under suspension state is higher than accumulation state when the temperature is above 1 035 ℃ and vice versa.Considering the time for heating calcium carbonate under accumulation state,the decompose time under suspension state is much shorter than that of accumulation state.Under suspension state,11.11 seconds is enough for the fully decomposition at 950 ℃ and 3.70 seconds at 1 200 ℃.

关 键 词：碳酸钙 一维炉 悬浮态 分解动力学 反应速率常数 

分 类 号：TU52[建筑科学—建筑技术科学]