基于响应曲面法和反应动力学优化铝渣中AlN的水解
Optimization of AlN hydrolysis in aluminum dross based on response surface methodology and reaction kinetics
董良民 1焦芬 1刘维 1刘世阳 1黄雅琳 1覃文庆1
作者信息
- 1. School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China
- 折叠
摘要
铝渣中的氮化铝(AlN)在潮湿的空气中会水解,释放出大量的氨气.氨气长时间暴露在空气中会危害环境和损害人体健康,但经有效处置可回收利用.本文针对AlN水解存在反应时间长、反应不彻底的特点,研究了反应温度、液固比和反应时间对水解行为的影响,并采用响应曲面法对实验条件进行了优化.在最佳实验条件下:反应温度95℃、反应时间11.2 h、液固比7.8:1 mL/g、搅拌速度400 r/min,AlN水解率为92.45%.反应动力学研究表明,水解过程由表面化学反应控制模型控制,表观活化能为40.24 kJ/mol.XRD和SEM-EDS结果显示,AlN最终转化为Al(OH)3附着在铝渣的表面,晶体随温度和时间的增加逐渐增大.本文结果为从铝渣中回收氨气提供了有效的参考.
Abstract
Aluminum nitride(AlN)in aluminum dross could be hydrolyzed in humid air,releasing a large amount of NH3.NH3 can harm environment and human health when exposed to air,but it could be recycled and utilized after effective disposal.This paper studied the effects of reaction temperature,liquid-solid ratio,and time on hydrolysis behavior,and optimized experimental conditions using response surface methodology,in response to characteristics of long reaction time and incomplete reaction in AlN hydrolysis.Hydrolysis rate of AlN was 92.45%under the optimum experimental conditions of:reaction temperature of 95℃,reaction time of 11.2 h,liquid-solid ratio of 7.8:1 mL/g,and stirring speed of 400 r/min.Reaction kinetics studies showed that hydrolysis process was controlled by a surface chemical reaction control model with an apparent activation energy of 40.24 kJ/mol.XRD and SEM-EDS results showed that AlN transforms into Al(OH)3 adhering to the surface of aluminum dross,with the crystals growing over temperature and time.This work provided value for recycling of NH3 from aluminum dross.
关键词
氮化铝/水解/响应曲面法/反应动力学/资源回收Key words
aluminum nitride/hydrolytic/response surface methodology/reaction kinetics/resource recovery引用本文复制引用
基金项目
National Natural Science Foundation of China(51874356)
National Key Research and Development Program of China(2020YFC1909203)
National Key Research and Development Program of China(2018YFC1902500)
出版年
2023
NETL
NSTL
维普
万方数据