Kinetics of thermal decomposition of hydromagnesite
Kinetics of thermal decomposition of hydromagnesite
复制标题
DOI：
10.1002/ceat.270180511
复制
发表时间：
1995-10
影响因子：
2.1
通讯作者：
T. Rao;V. S. Chohan
中科院分区：
文献类型：
--
作者：
T. Rao;V. S. Chohan
采用热重分析法研究了水菱镁矿的热分解过程。实验在氮气气氛中进行，水菱镁矿颗粒在300至550°C的温度范围内，以及粉末样品在非等温条件下以10°C/min的加热速率进行。脱水反应受外部传质控制，而分解反应受外部和内部传质控制。脱水反应的活化能为2.67 × 107 J/kmol。由非等温分析得到碳酸镁分解的活化能为1.62 × 108 J/kmol。
The thermal decomposition of hydromagnesite has been studied using thermogravimetric analysis. The experiments were conducted in a nitrogen atmosphere with pellets of hydromagnesite in the temperature range 300 to 550°C, and also with powder samples under non-isothermal conditions at a heating rate of 10°C/min. It is found that the reaction proceeds in two stages: dehydration followed by decomposition. The dehydration reaction is controlled by external mass transfer whilst the decomposition reaction is controlled by both external and internal mass transfer. The activation energy for the dehydration reaction was found to be 2.67 × 107 J/kmol. From the non-isothermal analysis the activation energy for the decomposition of magnesium carbonate was found to be 1.62 × 108 J/kmol.