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Parameters optimisation for direct flue gas CO₂ capture and sequestration by aqueous mineral carbonation using activated serpentinite based mining residue.

Pasquier, Louis-César; Mercier, Guy; Blais, Jean-François; Cecchi, Emmanuelle; Kentish, Sandra (2014). Parameters optimisation for direct flue gas CO₂ capture and sequestration by aqueous mineral carbonation using activated serpentinite based mining residue. Applied Geochemistry , vol. 50 . p. 66-73. DOI: 10.1016/j.apgeochem.2014.08.008.

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Résumé

Naturally occurring mineral carbonation can significantly reduce GHG emissions. Adapting the reaction in order to sequester post combustion CO₂ is a potential industrial mitigation pathway, but such a process must be chemically and economically efficient. Research to date has focused on reacting a concentrated CO₂ stream with alkaline rocks. Significant carbonation rates where reached but required a system operating at high pressure and temperature. This article describes the parameter optimization for direct flue gas CO₂ capture and sequestration when using finely-ground, heat-activated serpentine derived from mining residues. The gas is contacted with the minerals in an aqueous phase at ambient temperature and moderate pressure (10.5 Bar). Once the solution is saturated with dissolved CO₂ and Mg, it is filtered and carbonates precipitated in a downstream operation. The solid is mixed with fresh water and recirculated to treat more gas until no further Mg can be leached from the solid media. Reaction parameters such as the pulp density, the volumetric ratio of gas to liquid, the reaction time and the particle size were investigated with a 18.2% CO₂ gas stream in a batch mode. This innovative approach permits the use of moderate temperature and pressure conditions and the production of pure MgCO₃ with a potential sale value. After parameter optimisation, batch mode tests showed that 64 wt% of the Mg could be leached from the solid and that 62.5 wt% of the CO₂ removed from the gas phase giving a ratio of 0.28 kg of CO₂ sequestered per kg of residues.

Type de document: Article
Mots-clés libres: CO₂ capture; mineral carbonation; alkaline mining residues; magnesium carbonate; direct flue gas treatment
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 avr. 2018 14:59
Dernière modification: 11 avr. 2018 14:59
URI: http://espace.inrs.ca/id/eprint/3657

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