摘要
采用Satava法对Mg(OH)2热分解动力学机理进行了分析,借助扫描电子显微镜对其煅烧过程结构、形貌变化进行了分析,认为Mg(OH)2的热分解是一较为复杂的过程,用单一的热分解机理函数描述是不合理的。这一过程可分为两个部分,分界点为397℃,在此温度之前,热分解控制机理为成核和随后生长,动力学机理函数为A3;而在这一温度之后,热分解控制机理为扩散控制,动力学机理函数为D4。
The paper studied the kinetic mechanism of thermo - decomposition of Mg（OH）2 using Satava method. The changes in structure and morpha of Mg（OH）2 in the process of dehydroxylation were tested by SEM. The results showed that the thermo - decomposition of Mg（OH）2 is a complex process and cannot be represented by a single mechanism function. The process can be divided into two parts and two mechanism functions can represent it, the dividing temperature value being 397℃. The nucleation mechanism can represent kinetic control type when the temperature value is lower than 397℃, and kinetic function is A3. However, when the temperature value is higher than 397 ℃, the kinetic control type is diffusion control, and the kinetic functions is D4.
出处
《盐湖研究》
CSCD
2006年第1期39-42,共4页
Journal of Salt Lake Research
