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Mineral carbonation of CO2 with steel slags and waste concrete.

Ben Ghacham, Alia; Pasquier, Louis-César; Cecchi, Emmanuelle; Blais, Jean-François; Mercier, Guy (2015). Mineral carbonation of CO2 with steel slags and waste concrete. In: 5th International Conference on Accelerated - Carbonation for Environmental and Material - Engineering 2015, 21-24 juin 2015, New York, États-Unis.

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Résumé

In this study, samples of waste concrete and steel slags were tested for CO2 sequestration using direct aqueous mineral carbonation in milder conditions. Tests were conducted at ambient temperature, with a simulated flue gas (18.2 vol.%CO2), at maximum pressure of 10.68 barg. The effect of the aggregates separation from the concrete matrix on reaction efficiency was studied. Results show that the resulting concrete powder was more reactive. Conversion of 0.055 g CO2/g sample was observed compared with 0.036 g CO2/g sample obtained with raw waste concrete. Tests realised with aggregates reveals that they are little reactive. Tests were also realised by treating successive batches of gas with renewing the liquid phase after each batch. The effect of solid material reconditioning by grinding was monitored. It revealed that these methodologies have slightly enhanced the material sequestration potential. In addition, the use of concrete powder presents two main advantages; the enhancement of the CO2 conversion and the possibility to sell the resulting aggregates which will have beneficial effect on the process economy. Concerning steel slags, results showed the possibility to obtain relatively good conversion of 0.062 g CO2/g sample in milder conditions. © 2015 The Authors.

Type de document: Document issu d'une conférence ou d'un atelier
Mots-clés libres: carbonatation minérale; dioxyde de carbone; scories d'acier; déchets de béton
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 nov. 2020 20:40
Dernière modification: 18 nov. 2020 20:40
URI: http://espace.inrs.ca/id/eprint/4295

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