Abstract
ABSTRACTIn the present study, direct acid and active calcination–acid leaching processes were employed to remove K2O and Fe2O3 impurities from bauxite tailings. For direct acid leaching, the results indicated that Fe2O3 can be removed with the addition of 3 mol L−1 HCL, whereas K2O cannot be removed even when the concentration of HCl is higher than 7 mol L−1. As the bauxite tailings were calcined at 400–700°C, both K2O and Fe2O3 were removed at low HCl concentration (3 mol L−1), which was ascribed to the removal of hydroxyls and increased K activity, derived from X-ray diffraction, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy.
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