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An eco-friendly and cleaner process for preparing architectural ceramics from coal fly ash: Pre-activation of coal fly ash by a mechanochemical method
Luo, Yang1,2,3,4; Wu, Ying-hong1,2,5; Ma, Snu-hua1; Zheng, Shi-li1; Chu, Paul K.3,4
2019-03-20
Source PublicationJOURNAL OF CLEANER PRODUCTION
ISSN0959-6526
Volume214Pages:419-428
Abstract

Using coal fly ash (CFA) as the raw materials in ceramic production is an effective means to realize large quantity and high-value utilization. An eco-friendly and cleaner process to prepare architectural ceramics from CFA is described in this paper. CFA first undergoes mechanochemical activation and then used to prepare porcelain ceramic tiles with outstanding mechanical properties. The solution after activation is the sole raw materials to produce foamed ceramics with novel thermal insulation properties. The mechanochemical activation mechanism is investigated systematically. During activation, some of the octahedrally coordinated A134- ions are converted into tetrahedrally coordinated Al3+, which can substitute for SO+ in the tetrahedral rendering the silicate structure in activated CFA unstable. Moreover, the preparation mechanism of the foamed ceramics is studied. On the micro-level, solidification of the foamed ceramics can be interpreted as Si-O-Si structural transformation from two-dimensional layers to a three-dimensional network during sintering. The two final products are characterized and the good mechanical properties of as-obtained porcelain ceramic tiles are attributed to the needle-shape mullite derived from activated CFA. The low thermal conductivity of 0.0453 Wim"K of the as-obtained foamed ceramics arises from the unique cavity construction. Finally, the substance flow, gas emission, and heavy metal leaching behavior of the final products are discussed and the results indicate that there is almost no hazardous waste emission in the process. This study provides insights into more efficient and cleaner utilization of CFA as ceramic materials. (C) 2019 Elsevier Ltd. All rights reserved.

KeywordCoal Fly Ash Pre-activation Porcelain Ceramic Tile Foamed Ceramic Mullite
DOI10.1016/j.jclepro.2018.12.292
Language英语
WOS KeywordInsulating Foam Glass ; Raw-materials ; Mechanical-properties ; Sodium-silicate ; Porcelain ; Nmr ; Phase ; Al-27 ; Si-29 ; Substitution
Funding ProjectCity University of Hong Kong Strategic Research Grant (SRG)[7005105] ; Xilingol Vocational College Joint Research Grant[Y69019L088]
WOS Research AreaScience & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology
WOS SubjectGreen & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences
Funding OrganizationCity University of Hong Kong Strategic Research Grant (SRG) ; Xilingol Vocational College Joint Research Grant
WOS IDWOS:000458228300039
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/27868
Collection中国科学院过程工程研究所
Corresponding AuthorZheng, Shi-li; Chu, Paul K.
Affiliation1.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, CAS Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.City Univ Hong Kong, Dept Phys, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China
4.City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China
5.City Univ Hong Kong, Sch Energy & Environm, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Luo, Yang,Wu, Ying-hong,Ma, Snu-hua,et al. An eco-friendly and cleaner process for preparing architectural ceramics from coal fly ash: Pre-activation of coal fly ash by a mechanochemical method[J]. JOURNAL OF CLEANER PRODUCTION,2019,214:419-428.
APA Luo, Yang,Wu, Ying-hong,Ma, Snu-hua,Zheng, Shi-li,&Chu, Paul K..(2019).An eco-friendly and cleaner process for preparing architectural ceramics from coal fly ash: Pre-activation of coal fly ash by a mechanochemical method.JOURNAL OF CLEANER PRODUCTION,214,419-428.
MLA Luo, Yang,et al."An eco-friendly and cleaner process for preparing architectural ceramics from coal fly ash: Pre-activation of coal fly ash by a mechanochemical method".JOURNAL OF CLEANER PRODUCTION 214(2019):419-428.
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