TheeffectofCO2 andsalinityonolivinedissolutionkineticsat120 ◦ C

This paper reports the results of an experimental study on the dissolution kinetics of olivine (Mg1.82Fe0.18SiO4) at operating conditions relevant to the mineral carbonation process for the permanent storage of CO2. In particular, we investigated the effects of CO2 fugacity (fCO2 ) 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 fCO2 and by dosing LiOH (for pH control), NaCl, and NaNO3. 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