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Alumina Extraction from Coal Fly Ash via Low-Temperature Potassium Bisulfate Calcination
Guo, Chunbin1,2; Zou, Jingjing3; Ma, Shuhua2; Yang, Jianlin1; Wang, Kehan1
2019-10-01
Source PublicationMINERALS
Volume9Issue:10Pages:14
Abstract

Owing to the depletion of bauxite and increasing demand for alumina, calcination methods for extracting alumina from coal fly ash (CFA) were developed. However, these methods have disadvantages such as the need for high temperatures and the emission of toxic gases. Hence, in this study, Al2O3 was extracted from CFA via low-temperature potassium bisulfate calcination technology. Effects of the potassium bisulfate amount, calcination temperature, and calcination time on the alumina extraction efficiency were investigated using X-ray diffraction, thermal gravimetry, scanning electron microscopy, differential scanning calorimetry, and energy-dispersive spectroscopy. It was found that this technique could recover alumina efficiently, and potassium bisulfate significantly contributed to the degradation of mullite and corundum phases. Al2O3 in CFA was converted into soluble K3Al(SO4)(3). With a KHSO4/Al2O3 molar ratio of 7:1, calcining temperature of 230 degrees C, and calcining time of 3 h, the alumina extraction efficiency reached a maximum of 92.8%. The Avrami-Erofeev equation showed the best fit with the kinetic data for the low-temperature calcination of CFA with KHSO4. The activation energy was 28.36 kJ/mol.

KeywordCoal Fly Ash Potassium Bisulfate Low-temperature Calcination Alumina Extraction
DOI10.3390/min9100585
Language英语
WOS KeywordCirculating Fluidized-bed ; Mechanical Strength ; Thermal-activation ; Ammonium-sulfate ; Microstructure ; Separation ; Xonotlite ; Residues ; Kinetics ; Recovery
Funding ProjectLiaoning Provincial College Basic Research Program of Liaoning Education Department[LJ2017QL004] ; industrial public relations and industrialization guidance plan of Liaoning Provincial Department of Science and Technology[2019JH8/10100092] ; Undergraduate Training Program for Innovation and Entrepreneurship of Liaoning Provincial[201810147047] ; Undergraduate Training Program for Innovation and Entrepreneurship of Liaoning Provincial[201810147088] ; National Natural Science Foundation of China[51404136] ; Major Science and Technology Program of the Inner Mongolia Autonomous Region ; Natural Science Foundation Guide Project of Liaoning Province[20180551120]
WOS Research AreaMineralogy ; Mining & Mineral Processing
WOS SubjectMineralogy ; Mining & Mineral Processing
Funding OrganizationLiaoning Provincial College Basic Research Program of Liaoning Education Department ; industrial public relations and industrialization guidance plan of Liaoning Provincial Department of Science and Technology ; Undergraduate Training Program for Innovation and Entrepreneurship of Liaoning Provincial ; National Natural Science Foundation of China ; Major Science and Technology Program of the Inner Mongolia Autonomous Region ; Natural Science Foundation Guide Project of Liaoning Province
WOS IDWOS:000498225200018
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/38390
Collection中国科学院过程工程研究所
Corresponding AuthorZou, Jingjing; Ma, Shuhua
Affiliation1.Liaoning Tech Univ, Dept Mat Sci & Engn, Fuxing 123000, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Liaoning Tech Univ, Dept Environm Sci & Engn, Fuxing 123000, Peoples R China
Recommended Citation
GB/T 7714
Guo, Chunbin,Zou, Jingjing,Ma, Shuhua,et al. Alumina Extraction from Coal Fly Ash via Low-Temperature Potassium Bisulfate Calcination[J]. MINERALS,2019,9(10):14.
APA Guo, Chunbin,Zou, Jingjing,Ma, Shuhua,Yang, Jianlin,&Wang, Kehan.(2019).Alumina Extraction from Coal Fly Ash via Low-Temperature Potassium Bisulfate Calcination.MINERALS,9(10),14.
MLA Guo, Chunbin,et al."Alumina Extraction from Coal Fly Ash via Low-Temperature Potassium Bisulfate Calcination".MINERALS 9.10(2019):14.
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