Recycling of mullite from high-alumina coal fly ash by a mechanochemical activation method: Effect of particle size and mechanism research

doi:10.1016/j.scitotenv.2021.147100

	Recycling of mullite from high-alumina coal fly ash by a mechanochemical activation method: Effect of particle size and mechanism research
	Ji, Haiyan 1; Mi, Xue 1; Tian, Qiangkun 3; Liu, Chunli 1; Yao, Junxia 1; Ma, Shuhua 2; Zeng, Guisheng 1
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2021-08-25
卷号	784 页码:8
关键词	High-alumina coal fly ash Microstructure characteristics Mechanochemical activation Particle size Recycling Mullite
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2021.147100
英文摘要	High-alumina coal fly ash (HAFA) is a special solid waste since its alumina content can reach 40-50 wt%, which is seen as a potential resource for mullite material production. However, obtaining an ideal mullite material from HAFA is difficult because of its low Al2O3/SiO2 mass ratio. In this work, the microstructure characteristics of HAFA were systematically analyzed by combining multiple characterization techniques. It was found that HAFA had a core-shell structure with a mullite/corundum crystal core and a silica-rich amorphous phase shell. The novel mechanochemical activation-desilication process was used to remove amorphous phase from HAFA and elevate the Al2O3/SiO2 mass ratio. In particular, the effect of particle size after mechanical treatment and mechanism of the desilication process were extensively investigated. On decreasing the particle size, a high leaching rate of alumina was achieved during mechanochemical activation, thus generating a hydroxysodalite coating layer as desilication was suppressed, and the amorphous phase was effectively removed. The mineralogical phase of the desilicated HAFA is mainly mullite and corundum, and the Al2O3/SiO2 mass ratio was elevated from 1.29 to 3.02. Mullite refractory obtained from the desilicated HAFA exhibited excellent physical properties. This study provides insights into further high-valued utilization of HAFA. (C) 2021 Elsevier B.V. All rights reserved.
资助项目	PhD early development program of Nanchang Hangkong University[EA201902306]
WOS关键词	POWER-PLANT ; ACID
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000657598400011
资助机构	PhD early development program of Nanchang Hangkong University
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/49131]
专题	中国科学院过程工程研究所
通讯作者	Liu, Chunli
作者单位	1.Nanchang Hangkong Univ, Sch Environm & Chem Engn, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 3.ChuXiong DianZhong Non ferrous Met Co Ltd, Chuxiong 675000, Peoples R China
推荐引用方式 GB/T 7714	Ji, Haiyan,Mi, Xue,Tian, Qiangkun,et al. Recycling of mullite from high-alumina coal fly ash by a mechanochemical activation method: Effect of particle size and mechanism research[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,784:8.
APA	Ji, Haiyan.,Mi, Xue.,Tian, Qiangkun.,Liu, Chunli.,Yao, Junxia.,...&Zeng, Guisheng.(2021).Recycling of mullite from high-alumina coal fly ash by a mechanochemical activation method: Effect of particle size and mechanism research.SCIENCE OF THE TOTAL ENVIRONMENT,784,8.
MLA	Ji, Haiyan,et al."Recycling of mullite from high-alumina coal fly ash by a mechanochemical activation method: Effect of particle size and mechanism research".SCIENCE OF THE TOTAL ENVIRONMENT 784(2021):8.