Article révisé par les pairs
Résumé : To analyze the influence of a precipitation mineralization reaction between dissolved CO2 and calcium ions on the convective transfer of CO2 toward an aqueous phase, the convective dissolution of CO2 into aqueous solutions of calcium hydroxyde [Ca(OH)2] and calcium chloride (CaCl2) of various concentrations is studied experimentally. We show that different precipitation patterns develop in the aqueous solution depending on the nature and concentration of the reactant in the host phase. In the case of Ca(OH)2, precipitation coupled to convection leads to vigorous convective mixing in the host phase and sedimentation of solid particles of calcium carbonate (CaCO3) down to the bulk of the reservoir. Conversely, dissolution of CO2 in buffered CaCl2 solutions leads to a stabilization of the buoyancy-driven convection due to a decrease in density and the adherence of the precipitate to the cell walls.