Nano CaO grain characteristics and growth model under calcination

作者：Zhu Yanqing; Wu Sufang^*; Wang Xieqing

来源：Chemical Engineering Journal, 2011, 175: 512-518.

DOI：10.1016/j.cej.2011.09.084

• Nano CaO
• Calcination
• Grain characteristics
• Growth model

This paper addresses the grain characteristics and growth model of nano CaO under high-temperature calcination conditions. Nano CaO samples derived from nano CaCO(3) were prepared with a chamber calciner under different calcination times (10-480 min) and temperatures (750-900 degrees C) to study the nano CaO grain growth. X-ray diffractometer and the Scherrer formula were used to test and calculate the grain size of nano CaO. The microstructure and sorption performances of nano CaO were observed by a nitrogen adsorption/desorption apparatus and a thermogravimetric analysis. The results showed that the grain size of CaO grew faster as the calcination temperature increased. A growth asymptote was approached by prolonging the consecutive calcination time. A grain growth model for nano CaO was built according to solid phase sintering theory for the following conditions: 10-120 min isothermal calcination at 750-900 degrees C. The activation energy for nano CaO grain growth was calculated as 120 kJ/mol. In addition, the relation of grain growth, structural properties and CO(2) adsorption performance of nano CaO are discussed.

• 出版日期2011-11-15
• 单位浙江大学