Mechanisms of Separation and Crystal Growth of Mullite Grains during Preparation of Mullite-Based Ceramics from High Alumina Coal Fly Ash

doi:10.3390/pr10112416

CAS OpenIR

	Mechanisms of Separation and Crystal Growth of Mullite Grains during Preparation of Mullite-Based Ceramics from High Alumina Coal Fly Ash
	Zhang, Jianbo 1; Li, Huiquan 1,2; Li, Shaopeng 1
	2022-11-01
Source Publication	PROCESSES
Volume	10 Issue:11 Pages:11
Abstract	High-alumina coal fly ash (HAFA: 45% Al2O3 and 40% SiO2) is regarded as a special solid waste that is generated from power plants in northwestern China. It is regarded as an important substitute for bauxite and is applied to prepare mullite-based ceramics. In this work, a hydrometallurgy-pyrometallurgy synergistic process is proposed to resolve the lower Al2O3/SiO2 mass ratio (Al/Si) and lower degree of crystallinity that can promote the formation of compact mullite-based ceramics. During the activation-desilication process, the inert Al-O-Si is activated to form more active Si-O-H in acid activation, which can be decomposed easily in the desilication process, and the Al/Si mass ratio increases from 1.17 to 2.80, so the mullite grains and metastable phase can be exposed. During the sintering process, mullite grains and the metastable phase tended to axial growth, part of the metastable amorphous Q(4)(3,2,1Al) structure was transformed to Q(4)(4Al) structure (mullite), and then the staggered spatial structure was formed such that the bulk density and apparent porosity of the mullite-based ceramic reached 2.85 g/cm(3) and 0.5%, respectively. This process not only consumes more HAFA but also helps alleviate the shortage of bauxite, which will promote the development of clean coal-fired power generation.
Keyword	HAFA acid activation deep desilication A S mass ratio mullite
DOI	10.3390/pr10112416
Language	英语
WOS Keyword	COMPOSITE
Funding Project	National Nature Science Foundation of China ; National Key Research and Development Program of China ; Innovation Academy for Green Manufacture of the Chinese Academy of Sciences China ; [U1810205] ; [52174390] ; [51804293] ; [2019YFC1904302] ; [2021YFC2902602] ; [IAGM2022D04]
WOS Research Area	Engineering
WOS Subject	Engineering, Chemical
Funding Organization	National Nature Science Foundation of China ; National Key Research and Development Program of China ; Innovation Academy for Green Manufacture of the Chinese Academy of Sciences China
WOS ID	WOS:000910835300001
Publisher	MDPI
Citation statistics
Document Type	期刊论文
Identifier	http://ir.ipe.ac.cn/handle/122111/56593
Collection	中国科学院过程工程研究所
Corresponding Author	Zhang, Jianbo
Affiliation	1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Res Ctr Green Recycling Strateg Met Reso, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation GB/T 7714	Zhang, Jianbo,Li, Huiquan,Li, Shaopeng. Mechanisms of Separation and Crystal Growth of Mullite Grains during Preparation of Mullite-Based Ceramics from High Alumina Coal Fly Ash[J]. PROCESSES,2022,10(11):11.
APA	Zhang, Jianbo,Li, Huiquan,&Li, Shaopeng.(2022).Mechanisms of Separation and Crystal Growth of Mullite Grains during Preparation of Mullite-Based Ceramics from High Alumina Coal Fly Ash.PROCESSES,10(11),11.
MLA	Zhang, Jianbo,et al."Mechanisms of Separation and Crystal Growth of Mullite Grains during Preparation of Mullite-Based Ceramics from High Alumina Coal Fly Ash".PROCESSES 10.11(2022):11.

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