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About the foundations of direct aqueous carbonation with dissolution enhancing organic salts

Bonfils, Benjamin and Julcour-Lebigue, Carine and Bourgeois, Florent and Guyot, François and Chiquet, Pierre About the foundations of direct aqueous carbonation with dissolution enhancing organic salts. (2010) In: ACEME10 (Accelerated Carbonation for Environmental and Materials Engineering 2010), December 2010, Turku, Finland . (Unpublished)

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Abstract

Direct aqueous carbonation is a promising mineral carbonation route. Under mildly acidic conditions, this single-step carbonation process aims to simultaneously dissolve Ca/Mg-bearing silicates or wastes and precipitate Ca/Mg carbonates. By and large, since mineral dissolution is rate limiting due to the lack of protons at near-neutral pH, research has mainly been concerned with the issue of enhancing dissolution. By analysing the liquid phase, it has been established that polyacid organic salts can significantly enhance silicate dissolution under such unfavourable conditions. Comparatively little attention has been paid to the investigation of the very basis of the whole process, i.e. the concomitance of silicate dissolution and carbonate precipitation. By taking a close look at the solid phases in lizardite and olivine slurries, this work confirms the co-occurrence of magnesium silicate dissolution and magnesite precipitation inside a stirred reactor operating at 120°C, 20 bar of CO2 and 0.1M disodium oxalate, thereby bringing indisputable evidence that supports the foundation of direct aqueous carbonation with organic salts.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference without published proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Institut de Physique du Globe de Paris - IPGP (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD
Other partners > Université de Paris Diderot - Paris 7 (FRANCE)
Other partners > Total (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By:Florent BOURGEOIS

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