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Recovery of alumina from circulating fluidized bed combustion Al-rich fly ash using mild hydrochemical process
Alternative TitleTrans. Nonferrous Met. Soc. China
Yang, Quan-cheng1,2; Ma, Shu-hua1; Zheng, Shi-li1; Zhang, Ran1
2014-04-01
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN1003-6326
Volume24Issue:4Pages:1187-1195
AbstractTo utilize CFBC Al-rich fly ash, a mild hydrochemical extraction process was investigated for recovery of alumina. An alumina extraction efficiency of 92.31% was attained using a 45% NaOH solution, an original caustic ratio (molar ratio of Na2O to Al2O3 in the sodium aluminate solution) of 25, a molar ratio of CaO to SiO2 in the fly ash of 1.1, a liquid volume to solid mass ratio of 9, a reaction temperature of 280 degrees C, and a residence time of 1 h when treating fly ash with an alumina to silica mass ratio (A/S) of 0.78 and an alumina content of 32.43%. Additionally, the alumina leaching mechanism was explored via structural and chemical analysis, which revealed that after alkaline digestion, the main solid phase containing silica was NaCaHSiO4 with a theoretical A/S of zero.; To utilize CFBC Al-rich fly ash, a mild hydrochemical extraction process was investigated for recovery of alumina. An alumina extraction efficiency of 92.31% was attained using a 45% NaOH solution, an original caustic ratio (molar ratio of Na2O to Al2O3 in the sodium aluminate solution) of 25, a molar ratio of CaO to SiO2 in the fly ash of 1.1, a liquid volume to solid mass ratio of 9, a reaction temperature of 280 degrees C, and a residence time of 1 h when treating fly ash with an alumina to silica mass ratio (A/S) of 0.78 and an alumina content of 32.43%. Additionally, the alumina leaching mechanism was explored via structural and chemical analysis, which revealed that after alkaline digestion, the main solid phase containing silica was NaCaHSiO4 with a theoretical A/S of zero.
KeywordRecovery Of Alumina Fly Ash Phase Transformation Circulating Fluidized Bed Combustion (Cfbc)
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/S1003-6326(14)63178-2
URL查看原文
Indexed BySCI
Language英语
WOS KeywordFIRED POWER-PLANTS ; COAL ; EXTRACTION ; KAOLINITE ; ELEMENTS ; CHINA
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000339276700037
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Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11009
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.North China Inst Sci & Technol, Coll Environm Engn, Beijing 101601, Peoples R China
Recommended Citation
GB/T 7714
Yang, Quan-cheng,Ma, Shu-hua,Zheng, Shi-li,et al. Recovery of alumina from circulating fluidized bed combustion Al-rich fly ash using mild hydrochemical process[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2014,24(4):1187-1195.
APA Yang, Quan-cheng,Ma, Shu-hua,Zheng, Shi-li,&Zhang, Ran.(2014).Recovery of alumina from circulating fluidized bed combustion Al-rich fly ash using mild hydrochemical process.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,24(4),1187-1195.
MLA Yang, Quan-cheng,et al."Recovery of alumina from circulating fluidized bed combustion Al-rich fly ash using mild hydrochemical process".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 24.4(2014):1187-1195.
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