Iron’s Effect on Carbonation Rates
Source: Dan Hawkes
Kevin Knauss studied the effect of Fe on the measured rates of carbonation for the mineral olivine, and its role in the formation of Si-rich surface layers. From a series of batch and flow-through reactor experiments in pure water, they found that, under reducing conditions, olivine carbonation rates can be significantly increased by higher extents of dissolution and by the formation of ferroan magnesites (Mg,Fe)CO3, which nucleate faster than the pure Mg end-member. This work suggests new reference criteria for assessing the sequestration potential of CO2 repositories and the optimization of the mineral carbonation process in mafic and ultramafic rocks.
To read further, go to: http://www.sciencedirect.com/science/article/pii/S0016703713002640
Citation: Saldi, G.D., D. Daval, G. Morvan, and K.G. Knauss (2013), The role of Fe and redox conditions in olivine carbonations rates: An experimental study of the rate limiting reactions at 90 and 150 °C in open and closed systems. Geochimica et Cosmochimica Acta, 118, 157-183.