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Gra?fe, M., Landers, M., Tappero, R., Klauber, C., Hutomo, G., Gan, B., Grabsch, A., Austin, P. and Davies, I. (2010) A Study on Chemical Leaching of Iron from Red Mud Using Sulphuric Acid. 19th World Congress of Soil Science, Soil Solutions for a Changing World, Brisbane, 1-6 August 2010.

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• TITLE: X-Ray Diffraction, Electron Paramagnetic Resonance and Optical Absorption Study of Bauxite

  AUTHORS: Tanguturi Ravindra Reddy, Krishnan Thyagarajan, Ovidio Almanza Montero, Sanapa Reddy Lakshmi Reddy, Tamio Endo

  KEYWORDS: Bauxite; Gibbsite; X-Ray Diffraction (XRD); Electron Paramagnetic; Electron Paramagnetic Resonance; Optical Absorption Spectra; Fe3+; Water Fundamentals

  JOURNAL NAME: Journal of Minerals and Materials Characterization and Engineering, Vol.2 No.2, March 14, 2014

  ABSTRACT: The bauxite mineral obtained from Araku, Vishakapatnam district of Andhra Pradesh, India is used in the present work. Structural characterization was performed by X-ray diffraction (XRD). The mineral was found to be gibbsite in phase. The transitional metal ions present were investigated using electron paramagnetic resonance (EPR) and optical absorption spectra. The EPR results suggest that Fe3+ has replaced Al3+ in the unit cell of bauxite. The optical absorption spectrum is due to Fe3+ which indicates that it is in distorted octahedral environment. The near-infrared (NIR) spectrum is due to water fundamentals and combination overtones, which confirm the formula of the compound. The impurities in the mineral are identified using spectroscopic techniques.