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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 Publication | MINERALS
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Volume | 9Issue: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. |
Keyword | Coal Fly Ash Potassium Bisulfate Low-temperature Calcination Alumina Extraction |
DOI | 10.3390/min9100585 |
Language | 英语 |
WOS Keyword | Circulating Fluidized-bed ; Mechanical Strength ; Thermal-activation ; Ammonium-sulfate ; Microstructure ; Separation ; Xonotlite ; Residues ; Kinetics ; Recovery |
Funding Project | Liaoning 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 Area | Mineralogy ; Mining & Mineral Processing |
WOS Subject | Mineralogy ; Mining & Mineral Processing |
Funding Organization | Liaoning 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 ID | WOS:000498225200018 |
Publisher | MDPI |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.ipe.ac.cn/handle/122111/38390 |
Collection | 中国科学院过程工程研究所 |
Corresponding Author | Zou, Jingjing; Ma, Shuhua |
Affiliation | 1.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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Alumina Extraction f(4876KB) | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | Application Full Text |
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