Comprehensive analysis of direct aqueous mineral carbonation using dissolution enhancing organic additives

Bonfils, Benjamin, Julcour-Lebigue, Carine, Guyot, Francois, Bodenan, Francoise, Chiquet, Pierre and Bourgeois, Florent (2012) Comprehensive analysis of direct aqueous mineral carbonation using dissolution enhancing organic additives. International Journal of Greenhouse Gas Control, 9 : 334-346.


Author Bonfils, Benjamin
Julcour-Lebigue, Carine
Guyot, Francois
Bodenan, Francoise
Chiquet, Pierre
Bourgeois, Florent
Title Comprehensive analysis of direct aqueous mineral carbonation using dissolution enhancing organic additives
Journal name International Journal of Greenhouse Gas Control  (ERA 2012 Listed)    (ERA 2010 Rank B)   Check publisher's open access policy
Publication date 2012-07
Sub-type Article
DOI 10.1016/j.ijggc.2012.05.009
Volume number 9
ISSN 1750-5836; 1878-0148
Start page 334
End page 346
Total pages 13
Place of publication Oxford, United Kingdom
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract Direct aqueous mineral carbonation using organic anions has been presented by many as a promising strategy for mineral carbonation, on the basis that additives such as oxalate increase the rate and extent of dissolution of magnesium silicates several folds. Through geochemical modelling and detailed solid characterisation, this paper discusses and extends our current understanding of this process. The role of disodium oxalate as a dissolution enhancing agent for olivine is thoroughly examined through experiments in which all phases are carefully analysed. We show that under 20 bar of CO2 pressure formation of strong oxalate–magnesium complexes in solution and precipitation of MgC2O4·2H2O (glushinskite) impede any chance of obtaining significant amounts of magnesium carbonate. Other promising ligands from a dissolution perspective, namely citrate and EDTA salts, are also investigated. Contrary to oxalate, these ligands do not form any solid by-products with magnesium, and yet they do not produce better carbonation results, thereby casting strong doubts on the possibility of developing a direct aqueous mineral carbonation process using organic salts. Geochemical modelling permits successful simulation of the dissolution kinetics of magnesium silicate using a shrinking particle model that accounts for the precipitation of glushinskite, amorphous silica and a magnesium phyllosilicate at advanced stages of the dissolution process.
Keyword Mineral carbonation
Magnesium silicate
Oxalate
Geochemical modelling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Mon, 24 Sep 2012, 13:23:53 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre