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CO₂ sequestration using waste concrete and anorthosite tailings by direct mineral carbonation in gas–solid–liquid and gas–solid routes.

Ben Ghacham, Alia; Cecchi, Emmanuelle; Pasquier, Louis-César; Blais, Jean-François; Mercier, Guy (2015). CO₂ sequestration using waste concrete and anorthosite tailings by direct mineral carbonation in gas–solid–liquid and gas–solid routes. Journal of Environmental Management , vol. 163 . p. 70-77. DOI: 10.1016/j.jenvman.2015.08.005.

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Résumé

Mineral carbonation (MC) represents a promising alternative for sequestering CO₂. In this work, the CO₂ sequestration capacity of the available calcium-bearing materials waste concrete and anorthosite tailings is assessed in gas–solid–liquid and gas–solid routes using 18.2% flue CO₂ gas. The objective is to screen for a better potential residue and phase route and as the ultimate purpose to develop a cost-effective process. The results indicate the possibility of removing 66% from inlet CO₂ using waste concrete for the aqueous route. However, the results that were obtained with the carbonation of anorthosite were less significant, with 34% as the maximal percentage of CO₂ removal. The difference in terms of reactivity could be explained by the accessibility to calcium. In fact, anorthosite presents a framework structure wherein the calcium is trapped, which could slow the calcium dissolution into the aqueous phase compared to the concrete sample, where calcium can more easily leach. In the other part of the study concerning gas–solid carbonation, the results of CO₂ removal did not exceed 15%, which is not economically interesting for scaling up the process. The results obtained with waste concrete samples in aqueous phase are interesting. In fact, 34.6% of the introduced CO₂ is converted into carbonate after 15 min of contact with the gas without chemical additives and at a relatively low gas pressure. Research on the optimization of the aqueous process using waste concrete should be performed to enhance the reaction rate and to develop a cost-effective process.

Type de document: Article
Mots-clés libres: CO₂ sequestration; mineral carbonation; waste concrete; anorthosite tailings; flue gas composition
Centre: Centre Eau Terre Environnement
Date de dépôt: 19 avr. 2018 18:25
Dernière modification: 19 avr. 2018 18:25
URI: http://espace.inrs.ca/id/eprint/3807

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