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A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution
Xu, Dehua1,2; Li, Huiquan1; Bao, Weijun1; Wang, Chenye1
2016-10-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume165Issue:OCTPages:336-344
Abstract

Alumina was leached from high-alumina coal fly ash with a NH4HSO4 + H2SO4 mixed solution. The leaching behavior was systematically investigated, as were factors such as mixed solution composition and concentration, reaction time and temperature, and liquid-to-solid ratio. In optimal conditions, the alumina extraction ratios can reach 87.8%, 91.1%, and 87.5% for the three different sources of coal fly ash, respectively. The phases and morphology of the raw materials and residues were also analyzed through X-ray diffraction and scanning electron microscopy energy dispersive spectroscopy. Results showed that mullite, which is the main form taken by alumina in high-alumina coal fly ash, can be effectively decomposed to release the alumina and induce a new amorphous silica phase in mixed solution. (C) 2015 Elsevier B.V. All rights reserved.

KeywordAlumina High-alumina Coal Fly Ash Leaching Behavior Ammonium Bisulfate Sulfuric Acid
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2015.12.010
Indexed BySCI ; ISTP
Language英语
WOS KeywordSULFURIC-ACID ; CHINA
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000383522100019
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21343
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Xu, Dehua,Li, Huiquan,Bao, Weijun,et al. A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution[J]. HYDROMETALLURGY,2016,165(OCT):336-344.
APA Xu, Dehua,Li, Huiquan,Bao, Weijun,&Wang, Chenye.(2016).A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution.HYDROMETALLURGY,165(OCT),336-344.
MLA Xu, Dehua,et al."A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution".HYDROMETALLURGY 165.OCT(2016):336-344.
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