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粉煤灰提铝硅渣碱溶脱硅反应及其动力学 被引量:6

Desilication Reaction and Kinetics of Aluminum-Extracting Silicon Slag in NaOH Solution
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摘要 以内蒙古某酸法粉煤灰提铝硅渣为对象,研究了其在NaOH溶液中的非晶态SiO_(2)的脱硅行为,通过脱硅反应中脱硅率随时间的变化,研究搅拌速度、反应温度、NaOH溶液浓度对脱硅率的影响。通过拟合实验数据,确定脱硅反应的动力学规律和宏观动力学方程,并计算相应的表观活化能。结果表明:搅拌速度对脱硅率影响较小,提高反应温度和NaOH浓度可以大幅提高脱硅率,提铝硅渣在NaOH溶液中的脱硅反应受化学反应控制且符合Avrami方程,脱硅反应的表观活化能为82.086 kJ/mol。 The desilication behavior of amorphous SiO_(2) in NaOH solution was studied by taking aluminum silicon slag extracted from an acid method fly ash in Inner Mongolia as the object.Through the change of desilication rate with time in the desilication reaction,the effects of stirring speed,reaction temperature and NaOH solution concentration on the desilication rate of SiO_(2) were studied.By fitting the experimental data,the kinetic law and macroscopic kinetic equation of desilication reaction were determined,and the corresponding apparent activation energy was calculated.The results show that the stirring speed has little effect on the desilication rate,and the desilication rate greatly increases by increasing the reaction temperature and concentration of NaOH.The desilication reaction of aluminum-extracting silicon slag in NaOH solution is controlled by chemical reaction and conforms to Avrami equation.The apparent activation energy of desilication reaction is 82.086 kJ/mol.
作者 肖永丰 陈爱国 张雨薇 姜晓琳 刘汇东 XIAO Yongfeng;CHEN Aiguo;ZHANG Yuwei;JIANG Xiaolin;LIU Huidong(National Institute of Clean-and-Low-Carbon Energy,Beijing 102209,China;School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处 《硅酸盐通报》 CAS 北大核心 2021年第2期542-547,共6页 Bulletin of the Chinese Ceramic Society
关键词 提铝硅渣 SiO_(2) 脱硅反应 动力学 Avrami方程 aluminum-extracting silicon slag SiO_(2) desilication reaction kinetics Avrami equation
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