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Study of extracting alumina from high-alumina PC fly ash by a hydro-chemical process
Ding, Jian1,2; Ma, Shuhua2; Zheng, Shili2; Zhang, Yi2; Xie, Zongli4; Shen, Shirley4; Liu, Zhongkai2,3
AbstractAlumina extraction from high-alumina pulverized coal (PC) fly ash by a mild hydro-chemical process characterized by a high alkaline sodium aluminate solution was studied. A high alumina extraction efficiency of 96.03% has been achieved. The effects of temperature and reaction time on alumina extraction ratio, the phase transformation and the morphology change of the extraction residues have been investigated. The alumina extracting process involves two steps: transformation from mullite and corundum to an intermediate product aluminasilicate, Na8Al6Si6O24(OH)(2)(H2O)(2), and then from the aluminasilicate to calcium sodium hydrate silicate (NaCaHSiO4). The reaction temperature has been found to be critical for the alumina extraction and especially for the decomposition of the intermediate product Na8Al6Si6O24(OH)(2)(H2O)(2) at high temperatures (>250 degrees C). With the aid of a specially designed rapid real-time sampling device, the kinetics of the decomposition of Na8Al6Si6O24(OH)(2)(H2O)(2) at high temperatures has also been studied and fitted by the Avrami-Erofeev equation. Furthermore, some engineering suggestions about the reactors design and prevention of pipe scaling have been proposed based on the kinetic results. (C) 2016 Elsevier B.V. All rights reserved.
KeywordFly Ash Alumina Extraction Kinetics Hydro-chemical Process
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational Science and Technology Support Program of China(2012BAF03B01)
WOS IDWOS:000373542100009
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Cited Times:33[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
3.CHALCO, Zhengzhou Res Inst, Zhengzhou 450041, Peoples R China
4.CSIRO Mfg, Private Bag 10, Clayton, Vic 3169, Australia
Recommended Citation
GB/T 7714
Ding, Jian,Ma, Shuhua,Zheng, Shili,et al. Study of extracting alumina from high-alumina PC fly ash by a hydro-chemical process[J]. HYDROMETALLURGY,2016,161(MAY):58-64.
APA Ding, Jian.,Ma, Shuhua.,Zheng, Shili.,Zhang, Yi.,Xie, Zongli.,...&Liu, Zhongkai.(2016).Study of extracting alumina from high-alumina PC fly ash by a hydro-chemical process.HYDROMETALLURGY,161(MAY),58-64.
MLA Ding, Jian,et al."Study of extracting alumina from high-alumina PC fly ash by a hydro-chemical process".HYDROMETALLURGY 161.MAY(2016):58-64.
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