中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 过程工程研究所
  3. 中国科学院过程工程研究所
Mechanisms of Separation and Crystal Growth of Mullite Grains during Preparation of Mullite-Based Ceramics from High Alumina Coal Fly Ash

文献类型：期刊论文

作者Zhang, Jianbo2; Li, Huiquan1,2; Li, Shaopeng2
刊名PROCESSES
出版日期2022-11-01
卷号10期号:11页码:11
关键词HAFA acid activation deep desilication A S mass ratio mullite
DOI10.3390/pr10112416
英文摘要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.
WOS关键词COMPOSITE
资助项目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研究方向Engineering
语种英语
出版者MDPI
WOS记录号WOS:000910835300001
资助机构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
源URL[http://ir.ipe.ac.cn/handle/122111/56592]  
专题中国科学院过程工程研究所
通讯作者Zhang, Jianbo
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Res Ctr Green Recycling Strateg Met Reso, Beijing 100190, Peoples R China
推荐引用方式
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.

入库方式： OAI收割

来源：过程工程研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。