摘要
采用单一扫描速率法(2℃/min)对氧化钙粉末在CO2气氛中的碳酸化反应进行了热分析动力学研究。结果表明,氧化钙碳酸化反应的最大转化速率在694℃,与在镁钙砂表面碳酸化改性工艺研究中得到的最佳炉温十分接近;而氧化钙的碳酸化反应可用n=2的Avrami-Erofeev随机成核、随后生长模式(机理)函数描述,相应的表观反应活化能为178kJ·mol-1,频率因子为3.4×108min-1。
Carbonation kinetics of CaO powder in CO_2 has been investigated by means of single scan rate of 2℃/min for information valuable to the kinetics research of surface carbonation of MgO-CaO clinker. The results show that the maximum conversion rate of carbonation is at 694 ℃, which is close to the heating temperature at which anti-hydration MgO-CaO clinker is prepared with surface carbonation. The carbonation mechanism can be described by Avrami-Erofeev model function of nucleus formation and growth, while the corresponding apparent activation energy (E_a) of carbonation is 177.8 kJ·mol^-1 and the frequency factor is 3.4×10~8 min^-1.
出处
《武汉科技大学学报》
CAS
2005年第2期144-147,共4页
Journal of Wuhan University of Science and Technology
基金
教育部科学技术研究重点项目资助(02097).
关键词
氧化钙
碳酸化反应
热分析动力学
calcium oxide
carbonation
thermal analysis kinetics
