重庆万盛炼镁用白云岩分解动力学及影响因素的研究  

The kinetic mechanism and influential factors of the thermal decomposition process of magnesium-smelting dolomite from Wansheng area of Chongqing

作　　者：刘欢[1] 龙思远[1,2] 周玉乐[1] 杨怀德[1] 游国强[1,2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]国家镁合金材料工程技术研究中心,重庆400030

出　　处：《岩石矿物学杂志》2013年第6期1001-1005,共5页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金青年基金资助项目(51105393);中央高校基本科研业务基金(CDJXS11132226)

摘　　要：对重庆万盛地区的白云岩进行了TG-DTG热分解实验,研究其热分解机理和影响该机理的实验因素。结果表明:该地区白云岩热分解过程遵循三维扩散(球形对称,Jander方程)机理,热分解活化能E=357.4 kJ/mol,基于研究结果,建立了白云岩热分解过程的动力学模型;通过影响因素的对比实验发现,随着试样颗粒粒径的减小和试样重量的增加,白云岩的热分解活化能值会随之升高,而白云岩中SiO2含量以及保护气体流速的改变对白云岩热分解活化能的影响很小。Thermal decomposition reactions of dolomite samples from Wansheng area of Chongqing were investigated by the simultaneous TG/DTG experiments to reveal the thermal decomposition mechanism and influential factors.The results show that the thermal decomposition process of dolomite samples follows the three-dimensional diffusion （three dimensional particle shape,Jander equation） model,and the value of the activation energy for the thermal composition is 357.4 kJ/mol.The kinetic model of the thermal decomposition process has been established based on the research results.The contrast experiments of the influential factors show that the value of the activation energy for the thermal composition would be increased significantly with the decrease of sample particle size and the increase of sample weight; nevertheless,the change of the SiO2 content of dolomite and the flow rate of protective gas has little impact on the activation energy of thermal decomposition of the dolomite samples.

关 键 词：白云岩 热分解 动力学 影响因素 

分 类 号：TF822[冶金工程—有色金属冶金] P588.245[天文地球—岩石学]