Role of Fe species in geopolymer synthesized from alkali-thermal pretreated Fe-rich Bayer red mud

By Y. Hu, S. Liang, Jiakuan Yang, Ye Chen, N. Ye, Y. Ke, Shuangyi Tao, Keke Xiao, Jingping Hu, Hou-yu Hou and 4 more. Construction and Building Materials, 2019

167 citations recorded by the source corpus.

Abstract 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.

Subfields: Building and Construction, Civil and Structural Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/d4616b538f88441d5dfd4ec213cc4ebd95c93599

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Citations in the corpus

• Hardening evolution of geopolymers from setting to equilibrium: A review (2020, background): “Comparably, an increase in the dissolution of reactive Si and Al of Fe-rich Bayer red mud has been reported by increasing the calcination temperature in the range of 200–800 C, while it has been shown to reduce when calcined at 1100 C [71].”