Abstract
The alumina production Bayer process generates 0.7–2.0 ton of Bauxite Residue (BR) and an average of 1.0 ton of CO2 per ton of alumina produced. 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 salts followed by carbonation in order to precipitate the alkalinity on stable compounds. The main goal is to decrease the stabilization pH to facilitate the reuse. The processed material was analyzed periodically to monitor the appearance of carbonates. The pH of the suspension was monitored for 400 days after the reaction to evaluate the buffer effect. X-ray diffraction and scanning electron microscopy were used to analyze the reacted material.
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© 2017 The Minerals, Metals & Materials Society
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Venancio, L.C.A., Souza, J.A.S., Macedo, E.N., Botelho, F.A., de Oliveira, A.M., Fonseca, R.S. (2017). Bauxite Residue Amendment Through the Addition of Ca and or Mg Followed by Carbonation. In: Ratvik, A. (eds) Light Metals 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-51541-0_8
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DOI: https://doi.org/10.1007/978-3-319-51541-0_8
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