Abstract
This paper reports the results of an experimental study on the dissolution kinetics of olivine ( Mg 1.82 Fe 0.18 SiO 4 ) at operating conditions relevant to the mineral carbonation process for the permanent storage of CO 2 . In particular, we investigated the effects of CO 2 fugacity ( f CO 2 ) and of salinity on the kinetics of olivine dissolution, which is assumed to be the rate-limiting step of the overall carbonation process. Dissolution experiments were carried out at 120 ∘ C in a stirred flow-through reactor. Different pH values (between 3 and 8) and solution compositions were investigated by varying f CO 2 and by dosing LiOH (for pH control), NaCl, and NaNO 3 . The specific dissolution rate values, r, were estimated from the experimental data using a population balance equation (PBE) model coupled with a mass balance equation. The logarithms of the obtained r values were regressed with a linear model as a function of pH and compared to the model reported earlier [Hänchen, M., Krevor, S., Mazzotti, M., Lackner, K.S., 2007. Validation of a population balance model for olivine dissolution. Chem. Eng. Sci. 62, 6412–6422] for experiments with neither CO 2 nor salts. Our results confirm that, at a given temperature, olivine dissolution kinetics depends on pH only, and that f CO 2 and the concentrations of NaCl and NaNO 3 affect it through their effect on pH.
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