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Precipitation of calcium carbonate by carbon dioxide microbubbles / Jun-Hwan Bang in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 413–420 Titre : Precipitation of calcium carbonate by carbon dioxide microbubbles Type de document : texte imprimé Auteurs : Jun-Hwan Bang, Auteur ; Young Nam Jang, Auteur ; Wonbaek Kim, Auteur Année de publication : 2012 Article en page(s) : pp. 413–420 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Microbubble  Carbon  dioxide  Calcium  carbonate  Carbonation  route Résumé : The microbubble generator (MBG)—an apparatus in which tiny micron-sized gas bubbles are produced in the aqueous phase—has been widely used in water purification systems. In this study, the feasibility of utilizing the MBG to precipitate calcium carbonate along the carbonation route was examined. The effects of the calcium hydroxide concentration and the injection flow rate of carbon dioxide on the precipitation process were evaluated. Changes in pH, temperature of the suspension, and residual calcium ion concentration in the suspension were monitored to evaluate the proposed process. In addition, the process was compared with that based on a conventional bubble generator. This revealed a two-fold improvement in the acquisition time required for calcium carbonate precipitation as well as an increase in the conversion efficiency of carbon dioxide to carbonate minerals. The proposed process should be helpful for practical applications of a carbon sequestration method. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010795 [article] Precipitation of calcium carbonate by carbon dioxide microbubbles [texte imprimé] / Jun-Hwan Bang, Auteur ; Young Nam Jang, Auteur ; Wonbaek Kim, Auteur . - 2012 . - pp. 413–420. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 413–420 Mots-clés : Microbubble  Carbon  dioxide  Calcium  carbonate  Carbonation  route Résumé : The microbubble generator (MBG)—an apparatus in which tiny micron-sized gas bubbles are produced in the aqueous phase—has been widely used in water purification systems. In this study, the feasibility of utilizing the MBG to precipitate calcium carbonate along the carbonation route was examined. The effects of the calcium hydroxide concentration and the injection flow rate of carbon dioxide on the precipitation process were evaluated. Changes in pH, temperature of the suspension, and residual calcium ion concentration in the suspension were monitored to evaluate the proposed process. In addition, the process was compared with that based on a conventional bubble generator. This revealed a two-fold improvement in the acquisition time required for calcium carbonate precipitation as well as an increase in the conversion efficiency of carbon dioxide to carbonate minerals. The proposed process should be helpful for practical applications of a carbon sequestration method. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010795