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Recycling of mullite from high-alumina coal fly ash by a mechanochemical activation method: Effect of particle size and mechanism research
Ji, Haiyan1; Mi, Xue1; Tian, Qiangkun2; Liu, Chunli1; Yao, Junxia1; Ma, Shuhua3; Zeng, Guisheng1
2021-08-25
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume784Pages:8
AbstractHigh-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.
KeywordHigh-alumina coal fly ash Microstructure characteristics Mechanochemical activation Particle size Recycling Mullite
DOI10.1016/j.scitotenv.2021.147100
Language英语
WOS KeywordPOWER-PLANT ; ACID
Funding ProjectPhD early development program of Nanchang Hangkong University[EA201902306]
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
Funding OrganizationPhD early development program of Nanchang Hangkong University
WOS IDWOS:000657598400011
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/49132
Collection中国科学院过程工程研究所
Corresponding AuthorLiu, Chunli
Affiliation1.Nanchang Hangkong Univ, Sch Environm & Chem Engn, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China
2.ChuXiong DianZhong Non ferrous Met Co Ltd, Chuxiong 675000, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
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.
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