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Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method
Alternative TitleHydrometallurgy
Li, Huiquan1; Hui, Junbo1,2; Wang, Chenye1; Bao, Weijun1; Sun, Zhenhua1
2014-08-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume147Issue:8mPages:183-187
AbstractAlumina was leached from coal fly ash using a mixed alkali (NaOH + Ca(OH)(2)) through the hydrothermal method. The effects of leaching conditions on the alumina were studied, and the results showed that the alumina extraction ratio increased with increased reaction temperature, calcium-silicon ratio, and liquid-solid ratio. By optimising the leaching conditions, the alumina extraction ratio could reach 91.3%. The obtained leaching residues were analysed by X-ray diffraction (XRD) and scanning electron microscope (SEM) + energy dispersive spectrometer (EDS), and the reaction mechanism was also discussed. Results showed that amorphous silica and mullite were first dissolved and transformed into hydro-sodalite at relatively low temperatures. Hydro-sodalite reacted with calcium hydroxide to form sodium calcium silicate (NaCaHSiO4), which was the major component of the leaching residue. Zeolite was the equilibrium product, which accounted for most of the alumina leaching loss. The addition of Ca(OH)(2) effectively inhibited the silicon leaching into the solution. (C) 2014 Elsevier B.V. All rights reserved.; Alumina was leached from coal fly ash using a mixed alkali (NaOH + Ca(OH)(2)) through the hydrothermal method. The effects of leaching conditions on the alumina were studied, and the results showed that the alumina extraction ratio increased with increased reaction temperature, calcium-silicon ratio, and liquid-solid ratio. By optimising the leaching conditions, the alumina extraction ratio could reach 91.3%. The obtained leaching residues were analysed by X-ray diffraction (XRD) and scanning electron microscope (SEM) + energy dispersive spectrometer (EDS), and the reaction mechanism was also discussed. Results showed that amorphous silica and mullite were first dissolved and transformed into hydro-sodalite at relatively low temperatures. Hydro-sodalite reacted with calcium hydroxide to form sodium calcium silicate (NaCaHSiO4), which was the major component of the leaching residue. Zeolite was the equilibrium product, which accounted for most of the alumina leaching loss. The addition of Ca(OH)(2) effectively inhibited the silicon leaching into the solution. (C) 2014 Elsevier B.V. All rights reserved.
KeywordAlumina Coal Fly Ash Alkaline Hydrothermal Extraction
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2014.05.012
URL查看原文
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000340333100026
Citation statistics
Cited Times:61[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11436
Collection研究所(批量导入)
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
Li, Huiquan,Hui, Junbo,Wang, Chenye,et al. Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method[J]. HYDROMETALLURGY,2014,147(8m):183-187.
APA Li, Huiquan,Hui, Junbo,Wang, Chenye,Bao, Weijun,&Sun, Zhenhua.(2014).Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method.HYDROMETALLURGY,147(8m),183-187.
MLA Li, Huiquan,et al."Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method".HYDROMETALLURGY 147.8m(2014):183-187.
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