摘要
主要研究大粒径石灰石的煅烧特性,采用热重分析仪研究了5种不同粒径石灰石的煅烧过程。石灰石粒径分布在0.5～10 mm,煅烧温度在900～1 050℃。研究结果表明,粒径越小温度越高石灰石分解速率越快,而且粒径和煅烧温度对石灰石热分解机理也有明显的影响。粒径小温度高时反应符合随机成核和随后生长机理模型,粒径大温度低时反应符合相界面反应机理。当粒径为0.5～1 mm时反应活化能很小,随着粒径的增大反应活化能有所增加,粒径在1～5 mm时活化能变化不大,粒径继续增大(5～10 mm)活化能增大了1倍。
Thermal decomposition experiments of limestone with five different particle sizes were conducted through thermo gravimetric analyzer to study its calcined characteristics with large particle size.The limestone particle sizes were distributed in the range of 0.5-10 mm, and the temperature was controlled at 900-1 050℃ during the experiments.Rresuhs revealed that the smaller the particle size, the higher the temperature and the faster the decomposition.And the particle size and calcining temperature made an obvious influence on the thermal decomposition mechanism.When the particle size was small and the temperature was high, the reaction was in accordance with the randomly nucleating and nucleus growth model, but in con- trast,reaction was in accordance with the phase interface mechanism.When the particle size was at 0.5-1 mm, reaction acti- vation energy was very small, and with the increase of particle size, reaction activation energy increased, while in the range of 1--5 mm,activation energy fluctuated,with the continuous increase of particle size to 5-10 mm,the activation energy dou- bled.
出处
《无机盐工业》
CAS
北大核心
2013年第9期11-14,共4页
Inorganic Chemicals Industry
基金
国家自然科学基金创新群体(No:51021065)
国家重点基础研究发展计划项目(973计划)(2010CB227003)
“十二五”国家科技支撑计划课题(2011BAD15B05-03)
国家重大科学仪器设备开发专题项目(2011YQ120039)
关键词
石灰石
热重分析
粒径
热分解动力学
limestone
thermo gravimetric analysis
particle size
thermal decomposition kinetics
