Abstract
Mössbauer hyperfine and X-ray diffraction studies have been carried on original bauxite sample and thermally treated (between 200 and 1200°C) samples. Mössbauer spectrum of original bauxite shows the dominance of hematite (α-Fe2O3) along with Al-substituted hematite and goethite (α-FeOOH) of fine particle size. Mössbauer parameters for thermally treated samples indicate transformation of almost all of iron oxy-hydroxides into hematite up to 350°C. Around 800°C the formation of a new iron phase, assigned as iron substituted mullite (3Al2O3 2SiO3), occurs and its intensity increases with the rise in temperature and reaches a saturation around 1200°C. Furthermore, our studies confirm that HCl leaching is quite effective for the iron oxide removal.
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Raj, D., Harchand, K.S., Aggarwal, S. et al. High Temperature Transformation of Iron Minerals in Bauxite. Hyperfine è 153, 153–158 (2004). https://doi.org/10.1023/B:HYPE.0000024720.86390.7b
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DOI: https://doi.org/10.1023/B:HYPE.0000024720.86390.7b