Earth Sciences Division (ESD) Department of Energy (DOE) Lawrence Berkeley National Laboratory (LBNL)

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10/04/2013

Iron’s Effect on Carbonation Rates

Source:  Dan Hawkes

Giuseppe2
Fig. 1. Schematic illustration of the experimental setup used in this study for the open-system/mixed-flow reactor experiments.
In a recent paper, ESD’s Giuseppe Saldi, Damien Daval, and 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.

Funding: BES