Dépôt numérique

Aqueous mineral carbonation for CO₂ sequestration: From laboratory to pilot scale.

Kemache, Nassima; Pasquier, Louis-César; Cecchi, Emmanuelle; Mouedhen, Ikbel; Blais, Jean-François; Mercier, Guy (2017). Aqueous mineral carbonation for CO₂ sequestration: From laboratory to pilot scale. Fuel Processing Technology , vol. 166 . p. 209-216. DOI: 10.1016/j.fuproc.2017.06.005.

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In the actual context of the greenhouse gases (GHGs) control, the industrial sector must find efficient and practical solutions to reduce their emissions. The feasibility of an aqueous mineral carbonation (MC) process was demonstrated at the laboratory scale under original mild conditions. In the continuity of this research, the process was tested at a pilot scale using a cement plant flue gas comprising of 12% to 20% CO₂. Experiments were performed in an 18.7 L Parr reactor. Two different magnesium (Mg) rich tailings were used during the MC reactions with a solid/liquid ratio of 150 g/L, gas/liquid ratio of 3, room temperature (22 ± 3 °C) and a stirring speed of 600 rpm. The total pressure ranged between 2 and 10 atm. Each experiment comprised of six batches of gas with a residence time of 15 min to 30 min each for the liquid and 90 min for the solid. The results demonstrated that at low pressure (2 and 4 atm), between 90% and 96% of the CO₂ in the flue gas can be removed under dissolved form. The rate decreased to 64–74% at 10 atm. The cumulative quantity of dissolved CO₂ after six batches of treated gas increased with CO₂ partial pressure and from 0.08 to 0.25 g CO₂/g of residue. The magnesium (Mg) leaching followed the same trend as the captured CO₂ quantity. The higher cumulative leaching rate for the magnesium was 19%. These results were lower than those expected compared to the laboratory scale. The results showed that 25% to 33% of the total dissolved CO₂ was captured as nesquehonite (MgCO₃.3H₂O) of a high purity.

Type de document: Article
Mots-clés libres: aqueous mineral carbonation; CO₂ sequestration; pilot scale; cement plant flue gas
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 mai 2018 13:16
Dernière modification: 08 mai 2018 13:16
URI: http://espace.inrs.ca/id/eprint/6479

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