微波作用下铝酸钙炉渣非等温浸出动力学

Leaching kinetics of non-constant temperature process of calcium aluminate slag under microwave radiation

研究了微波作用下铝酸钙炉渣非等温浸出动力学,考察了不同微波辐射功率对炉渣中氧化铝浸出率的影响以及相应微波功率下反应体系温度随时间的变化规律。结果表明:该浸出动力学过程的控制步骤为界面化学反应控制,表观反应活化能为40 kJ/mol左右;微波作用可改变反应的频率因子,对反应活化能影响不明显;随着微波辐射功率的增大,频率因子增加,宏观表现出微波功率的增加对反应有促进作用。

The non-constant temperature leaching kinetics of calcium aluminate slag under microwave radiation was studied. The effects of microwave radiation power on the leaching rate of alumina and temperature of reaction system were determined. The results show that under the action of the microwave radiation heating, the leaching rate of alumina and the temperature of systems increase with increasing power of microwave radiation. Below solution boiling point, reacting system is a non-constant temperature process. The leaching ratio is controlled by chemical reaction. The apparent activation energy is about 40 kJ/mol. Microwave increases the frequency factor of reaction with the microwave power increasing, while the apparent activation energy of reaction has hardly been changed, which macroscopically demonstrates that the increase of the microwave power promotes the reaction.