A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution
Xu, Dehua1,2; Li, Huiquan1; Bao, Weijun1; Wang, Chenye1
2016-10-01
发表期刊HYDROMETALLURGY
ISSN0304-386X
卷号165期号:OCT页码:336-344
摘要

Alumina was leached from high-alumina coal fly ash with a NH4HSO4 + H2SO4 mixed solution. The leaching behavior was systematically investigated, as were factors such as mixed solution composition and concentration, reaction time and temperature, and liquid-to-solid ratio. In optimal conditions, the alumina extraction ratios can reach 87.8%, 91.1%, and 87.5% for the three different sources of coal fly ash, respectively. The phases and morphology of the raw materials and residues were also analyzed through X-ray diffraction and scanning electron microscopy energy dispersive spectroscopy. Results showed that mullite, which is the main form taken by alumina in high-alumina coal fly ash, can be effectively decomposed to release the alumina and induce a new amorphous silica phase in mixed solution. (C) 2015 Elsevier B.V. All rights reserved.

关键词Alumina High-alumina Coal Fly Ash Leaching Behavior Ammonium Bisulfate Sulfuric Acid
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.hydromet.2015.12.010
收录类别SCI ; ISTP
语种英语
关键词[WOS]SULFURIC-ACID ; CHINA
WOS研究方向Metallurgy & Metallurgical Engineering
WOS类目Metallurgy & Metallurgical Engineering
WOS记录号WOS:000383522100019
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21343
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Xu, Dehua,Li, Huiquan,Bao, Weijun,et al. A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution[J]. HYDROMETALLURGY,2016,165(OCT):336-344.
APA Xu, Dehua,Li, Huiquan,Bao, Weijun,&Wang, Chenye.(2016).A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution.HYDROMETALLURGY,165(OCT),336-344.
MLA Xu, Dehua,et al."A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution".HYDROMETALLURGY 165.OCT(2016):336-344.
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