YANG Yelin, LIAO Hongqiang, DUAN Siyu, WANG Jianke
(Institute of Resources and Environmental Engineering;State Environment Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources; Shanxi Key Laboratory of Coal Power Pollution Control and Waste Recycling Utilization, Shanxi University, Taiyuan 030006, China)
Abstract: In order to improve the comprehensive utilization efficiency of fly ash, a ball mill and a steam kinetic energy mill were used to grind fly ash.The particle size, specific surface area, activity index, remaining amount of spherical particles, phase composition and chemical composition of fly ash obtained by the two grinding methods were compared, as well as energy consumption and grinding efficiency of two grinding methods.The results show that compared with the ball mill, the particle size of fly ash powder obtained by steam kinetic energy grinding is smaller, the median diameter can reach 2.25 μm and the specific surface area can reach 1 110.5 m2/kg.The activity index of fly ash is higher and up to 107.7%.The phase composition of fly ash will not be changed and the crystallinity of minerals in fly ash will be reduced by steam kinetic energy mills and ball mills.As the grinding intensity increasing, the particle size is reduced and the crystallinity is reduced too.The grinding destroys the particles of fly ash and releases internal components such as Ca, Si and Al, which improves the release rate of Si and Al.The chemical composition of fly ash powder can be optimized and the hydration reaction can be strengthened.The steam kinetic energy mill has a higher grinding efficiency and a smaller energy consumption.
Keywords: fly ash; ball mill; steam kinetic energy mill; physicochemical properties; grinding efficiency
中图分类号： X705 文献标志码：A
文章编号：1008-5548(2022)01-0052-10
DOI:10.13732/j.issn.1008-5548.2022.01.006
收稿日期： 2021-05-18，修回日期：2021-11-03，在线出版时间：2021-12-02。
基金项目：国家重点研发计划项目，编号：2020YFB0606204；山西省重点研发计划项目，编号：201903D31007；山东省重大科技创新工程项目，编号：2019JZZY020306。
第一作者简介：杨烨霖(1995—)，男，硕士研究生，研究方向为固体废弃物资源化利用。E-mail：smile12579@163.com。
通信作者简介：廖洪强(1966—)，男，教授，博士，博士生导师，研究方向为固体废弃物资源化利用。E-mail：liaohongq@sxu.edu.cn。
