Olivine dissolution and carbonation under conditions relevant for in situ carbon storage

In order to evaluate the chemistry and kinetics of mineral carbonation reactions under conditions relevant to subsurface injection and storage of CO2, olivine alteration was studied at 60°C and 100bar CO2 pressure, including olivine dissolution and the formation of carbonate minerals. Batch experiments were performed with olivine (Fo92), water, CO2, and NaCl inside gold cells contained within rocking autoclaves. Two reproducible experiments yielded an initial (1h) dissolution rate of 9.50±0.10×10−11 and a long-term (10–70days) rate of 1.69±0.23×10−12molcm−2s−1. The long-term rate is consistent with previously published rate laws at 4.5