期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 200, 期 -, 页码 398-407出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.12.122
关键词
Bayer red mud; Alkali-thermal pretreatment; Geopolymer; Fe species
资金
- National Key Research and Development Program of China [2017YFC0703103, 2018YFC1900105]
- Project of Innovative and Interdisciplinary Team of Huazhong University of Science and Technology (HUST) [2015ZDTD027]
- Wuhan Yellow Crane Talent (Science) Plan
A geopolymer material was synthesized from alkali-thermal pretreated Fe-rich Bayer red mud (RM) and fly ash. Dissolution efficiencies of Al2O3 and SiO2 in the RM in alkaline solutions were improved by pretreatment. The transformation of mineral phases in the RM during synthesis of geopolymer was investigated by the alkaline leaching test, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The role of Fe species in geopolymerization was investigated by Mossbauer spectra. The results showed that binding energies of Al-O and Si-O increased in geopolymerization; the coordinated Fe3+ replaced Al3+ in the aluminosilicate structure of geopolymer. (C) 2018 Elsevier Ltd. All rights reserved.
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