The extent to which carbon dioxide (CO 2 ) mineralization ("carbonation") using alkaline solids can reduce atmospheric CO 2 concentrations is dictated by the rate of divalent alkaline metal release from such solids. These solids have distinct reactivities, that is, bulk dissolution rates, which dictate their rates of carbonation. To assess the feasibility of utilizing alkaline solids to mitigate CO 2 emissions at scale, assessments of practical carbonation potentials under ambient conditions, which are often distinct from their stoichiometric carbonation potential as described by their bulk chemical composition, are needed. Therefore, the carbonation (or "CO 2 mineralization") potentials of 16 naturally occurring (mafic and ultramafic) rocks and industrial alkaline solids (fly ashes and slags) were quantified. In general, the extent of carbonation for the pulverized and as-received solids which is achievable under ambient conditions [25 °C, 1 bar]in the presence of excess CO 2 and waterthat is, the carbonation potential, is correlated with the CaO and MgO content and varies inversely with the SiO 2 content. Particularly, the carbonation efficiency (i.e., the ratio of the measured to the stoichiometric carbonation potential) is controlled by the atomic topology (network connectivity) of the solid reactant suggesting that network rupture is the rate-controlling step of dissolution and, hence, carbonation. Based on our data, we offer estimates of CO 2 removal that can be achieved under ambient exposure conditions to assess the controls and capacity of ambient CO 2 mineralization as a carbon dioxide removal strategy.
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