Abstract
The production of one ton of alumina using the Bayer process generates 0.7–2.0 ton of Bauxite Residue (BR) and an average of 1.0 ton of CO2. The direct use of exhaust gases to react and reduce the alkalinity of BR may allow a triple gain: improving the storage conditions, opening a range of new applications for BR and sequester from 16 to 102 kg of CO2 per ton of alumina. This paper shows a lab scale long term program to measure the effects of adding different percentages of Ca and Mg hydroxides followed by carbonation in order to enhance the precipitation of the alkalinity on stable compounds. Analysis by X-ray diffraction and scanning electron microscopy was done to monitor the appearance of carbonates. The BR pH was monitored for 600 days to evaluate the buffer effect and compared with the stabilization pH of carbonated bauxite residue without addition.
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Venancio, L.C.A. et al. (2018). Analyzing the Bauxite Residue Amendment Through the Addition of Ca and Mg Hydroxides Followed by Carbonation. In: Martin, O. (eds) Light Metals 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72284-9_17
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DOI: https://doi.org/10.1007/978-3-319-72284-9_17
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