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Journal of Materials Science
Erschienen in: Journal of Materials Science 12/2014

01.06.2014

Thermal activation of coal fly ash by sodium hydrogen sulfate for alumina extraction

verfasst von: Chunbin Guo, Jingjing Zou, Yinshan Jiang, Tianping Huang, Yan Cheng, Cundi Wei

Erschienen in: Journal of Materials Science | Ausgabe 12/2014

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Abstract

The extraction of alumina from coal fly ash (CFA) is a good way to enhance its value-added utilization. The presence of inert matter with a high degree of polymerization, such as mullite and other aluminosilicates, greatly restricts the reactivity of CFA. Thus, the CFA needs to be activated before use. Thermal activation by calcination with added sodium hydrogen sulfate (NaHSO4) was carried out in this study. The calcination products were characterized by means of X-ray diffraction, thermal gravimetric and differential scanning calorimetric analysis, and scanning electron microscopy to assess the effects of the additive, calcining temperature, and calcining time on the products. The results indicated that NaHSO4 facilitated the decomposition of the polymeric phases and significantly improved the alumina extraction. Alumina in CFA was transformed into soluble Na3Al(SO4)3. When CFA was mixed with sodium hydrogen sulfate at a NaHSO4/Al2O3 molar ratio of 6, the alumina extraction reached 90 % at 500 °C after 2 h.
Vorheriger Artikel Effect of moisture content on freeze–thaw behavior of cement paste by electrical resistance measurements
Nächster Artikel The effect of nanoparticle on microdomain alignment in block copolymer thin films under an electric field

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Metadaten
Titel
Thermal activation of coal fly ash by sodium hydrogen sulfate for alumina extraction
verfasst von
Chunbin Guo
Jingjing Zou
Yinshan Jiang
Tianping Huang
Yan Cheng
Cundi Wei
Publikationsdatum
01.06.2014
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 12/2014
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-014-8127-1

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