论文部分内容阅读
在升温速率分别为10、15、20和25℃·min-1的条件下,利用差示扫描量热仪对红土镍矿非自由水脱除过程进行了测试.针对测试数据,分别采用Flynn-Wall-Ozawa(FWO)法、胡荣祖-高红旭-张海(Hu GZ)法、Boswell法、Starink法、FriedmanReich-Levi(Friedman)法等不同的转化率法计算其活化能,利用Malek法计算指前因子(A)以及确定机理函数,最后利用所得的动力学公式推导出等温下反应进度与时间的关系并对不同温度下的能耗进行分析比较.红土镍矿非自由水脱除过程的平均活化能为181.50 k J·mol-1;指前因子ln A为21.95 min-1;机理函数符合Z-L-T方程,即脱除过程为三维扩散控制机制;干燥温度越高所需的平均功率越小.
Under the condition of heating rate of 10, 15, 20 and 25 ℃ · min-1 respectively, the non-free water removal process of laterite nickel ore was tested by differential scanning calorimeter.According to the test data, Flynn- Wall-Ozawa (FWO) method, Hu GZ method, Boswell method, Starink method, Friedman Reich-Levi method and Friedman method were used to calculate the activation energy. (A) as well as the mechanism function, the relationship between the progress of isothermal reaction and time is deduced based on the kinetic formula obtained and the energy consumption under different temperatures are analyzed and compared. The average activation of non-free water removal in laterite nickel ore Which can be 181.50 kJ · mol-1; the pre-factor ln A is 21.95 min-1; the mechanism function is consistent with the ZLT equation, that is, the removal process is a three-dimensional diffusion control mechanism; the higher the drying temperature, the smaller the average power required.