摘要
对重庆某地区的白云石进行TG-DTG热分解实验,研究其热分解机理。结果表明:该地区白云石为钙质白云石,其热分解过程包括2个阶段。随升温速率的加快,2个热分解阶段的分解温度也相应地升高,但每个阶段的前后温度差基本保持不变;2个热分解过程分别遵循三维扩散(球形对称)和相界反应(圆柱形对称)机理,热分解活化能E分别为348.5 kJ/mol和369.2 kJ/mol。基于研究结果,建立了白云石热分解过程每个阶段的动力学模型。
Thermal decomposition reactions of dolomite samples in the area of Chongqing were investigated by simultaneous TG/DTG experiments, to study the thermal decomposition mechanism. Results show that dolomite samples are calcareous dolomite, and two steps are detected during the thermal decomposition process. With the increase of the heating rate, the decomposition temperature of two thermal decomposition processes will rise accordingly, but the temperature interval of the each single process remains basically constant; Two thermal decomposition stages follow separately the three-dimensional diffusion （tridimensional particle shape） and phase boundary controlled reaction （contracting area-bidimensional shape） model, and the values of the activation energies for the thermal composition were calculated to be 348.5 kJ/mol and 369.2 kJ/mol, respectively. Finally, the kinetic models of different stages of thermal decomposition were established.
出处
《矿物学报》
CAS
CSCD
北大核心
2014年第1期35-39,共5页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(批准号:51105393)
中央高校基本科研业务基金(编号:CDJXS11132226)
关键词
白云石
热分解
动力学
机理
dolomite
thermal decomposition
kinetics
mechanism
