CAS OpenIR
Formation mechanism of an undesirable by-product in the mild hydro-chemical process for the extraction of alumina from fly ash and its mitigation
Ding, Jian1; Ma, Shuhua1; Xie, Zongli2; Wang, Xiaohui1; Zheng, Shili1; Zhang, Yi1
2019-06-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume186Pages:292-300
AbstractThe mild hydro-chemical process has been commercially demonstrated as an effective method to extract alumina from high alumina fly ash. This study investigated the formation mechanism of an undesirable aluminum containing by-product, hydrated sodium calcium aluminosilicate (HSCA, 1.2Na(2)O center dot 0.8CaO center dot Al2O3 center dot 2SiO(2)center dot H2O), produced during the mild hydro-chemical process and its mitigation strategy. The effects of reaction temperature, residence time and mole ratio of calcium to silicon on the alumina extraction and phase transformation of the leaching residues have been investigated, confirming the formation of HSCA phase being responsible for the decrease of alumina extraction efficiency. At the low Ca(OH)(2) addition, the HSCA phase could be easily transformed from Na8Al6Si6O24(OH)(2)(H2O)(2) combining with Ca(OH)(2). On the other hand, when the addition of Ca(OH)(2) was abundant, the existence of the NaCaHSiO4 product layer would insulate most of Ca(OH)(2) from the Na8Al6Si6O24(OH)(2)(H2O)(2) causing formation of HSCA. Based on the reaction mechanism and coating effect analysis, the mitigation strategy was also proposed. By increasing stirring speed to break the NaCaHSiO4 coating layer, HSCA phase could be completely avoided and a qualified alumina extraction efficiency of 90.84% could be achieved.
KeywordFly ash Alumina extraction Product-layer coating Hydro-chemical process
DOI10.1016/j.hydromet.2019.04.012
Language英语
WOS KeywordCOAL ; ACID
Funding ProjectNational Natural Science Foundation of China[51774261] ; Nation 973 Project of China[2013CB632601] ; China Scholarship Council (CSC) ; Xilingol Vocational College[Y69019L088]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China ; Nation 973 Project of China ; China Scholarship Council (CSC) ; Xilingol Vocational College
WOS IDWOS:000473837400035
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/30195
Collection中国科学院过程工程研究所
Corresponding AuthorMa, Shuhua; Zheng, Shili
Affiliation1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.CSIRO Mfg, Private Bag 10, Clayton, Vic 3169, Australia
Recommended Citation
GB/T 7714
Ding, Jian,Ma, Shuhua,Xie, Zongli,et al. Formation mechanism of an undesirable by-product in the mild hydro-chemical process for the extraction of alumina from fly ash and its mitigation[J]. HYDROMETALLURGY,2019,186:292-300.
APA Ding, Jian,Ma, Shuhua,Xie, Zongli,Wang, Xiaohui,Zheng, Shili,&Zhang, Yi.(2019).Formation mechanism of an undesirable by-product in the mild hydro-chemical process for the extraction of alumina from fly ash and its mitigation.HYDROMETALLURGY,186,292-300.
MLA Ding, Jian,et al."Formation mechanism of an undesirable by-product in the mild hydro-chemical process for the extraction of alumina from fly ash and its mitigation".HYDROMETALLURGY 186(2019):292-300.
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