用热重分析法研究阿尔及利亚Tamazarte高岭土的热分解动力学（英文）

发布时间：2018-05-24 15:19

  本文选题：高岭土 + 分解动力学　； 参考：《Transactions of Nonferrous Metals Society of China》2017年08期

【摘要】：采用热重分析法(TG)和研究阿尔及利亚Tamazarte高岭土的热分解动力学。差热分析(DTA)和TG实验在室温~1400°C下进行,加热速率为10~40°C/min。采用JMA和Ligero法由等温处理测得的活化能,以及采用OFW和KAS法由非等温处理测得的活化能,分别约为151和144 kJ/mol。采用非等温处理确定的生长形貌Avrami参数约为1.57,而采用等温处理时该值约为1.35。数值因数与晶体生长的维度有关,采用Matusita方程确定的值为1.53。采用等温处理时,计算得到的频率因子为1.55×10~7s~(-1)。结果表明,块体形核之后伴随偏高岭土的三维生长,偏高岭土具有受扩散控制的多面体结构,以一定数量的晶核开始生长。
[Abstract]:Thermogravimetric analysis (TG) was used to study the thermal decomposition kinetics of Tamazarte kaolin in Algeria. The differential thermal analysis (DTA) and TG experiments were carried out at room temperature at 1400 掳C at the heating rate of 1040 掳C / min. The activation energy measured by isothermal treatment by JMA and Ligero and by non-isothermal treatment by OFW and KAS is about 151 and 144 KJ / mol, respectively. The Avrami parameter of growth morphology determined by non-isothermal treatment is about 1.57, and that of isothermal treatment is about 1.35. The numerical factor is related to the dimension of crystal growth, and the value determined by Matusita equation is 1.53. The frequency factor calculated by isothermal treatment is 1.55 脳 10 ~ (7) ~ (-1) ~ (-1) ~ (-1). The results show that the bulk nucleation is followed by the three-dimensional growth of metakaolin, which has a polyhedron structure controlled by diffusion and begins to grow with a certain number of crystal nuclei.
【作者单位】： Physics
【分类号】：O643.1;TD985
，

本文编号：1929529