成型菱镁矿粉矿分解动力学  

Decomposition kinetics of briquetting magnesite powder ore

作　　者：王兴[1] 李志坚[1] 贾洪祥[1] 郭玉香[1] 

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,辽宁鞍山114051

出　　处：《辽宁科技大学学报》2016年第4期254-257,共4页Journal of University of Science and Technology Liaoning

基　　金：国家十二五科技支撑项目"悬浮闪速制备高活性轻烧氧化镁新流程技术研究"(2014BAB02B01)

摘　　要：为研究成型菱镁矿粉矿在分解过程中的分解行为机理,利用TG法分析成型菱镁矿粉矿在3,4,5℃/min升温速率下的转化率,并通过Coats-Redfern方程确立成型菱镁矿粉矿热分解动力学三因子。结果表明:成型菱镁矿粉矿分解活化能为96.67 k J/mol,指前因子为4.18×10~5s^(^(-1)),反应机理为三维扩散,由Z-L-T方程控制的三维扩散3D模型为最概然机理函数,动力学微分方程为dα/dt=4.18×10~5exp(-96.67/RT)1.5(1-α)^(4/3)[(1-α)^(-1/3)^(-1)]^(-1)In order to study the decomposition mechanism of the briquetting magnesite powder ore during the decomposition process, the conversion rate of briquetting magnesite powder ore was studied by TG method at3,4,5 ℃/min heating rate, and thermal decomposition kinetic triplet of the briquetting magnesite powder ore was established by Coats- Redfern equation. The results showed that the decomposition activation energy is96.67 k J/mol, the pre-exponential factor is 4.18×105s^(-1). The reaction mechanism is the three-dimensional diffusion. The most probable mechanism function is the 3D model controlled by Z-L-T equation, and the differential kinetics equation is dα/dt=4.18×10~5exp(-96.67/RT)1.5(1-α)^(4/3)[(1-α)^(-1/3)^(-1)]^(-1)

关 键 词：菱镁矿粉矿 成型 热重分析 活化能 反应机理 

分 类 号：TB321[一般工业技术—材料科学与工程]