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Continuous process for the aqueous carbonation of serpentinite leachate derived from carbonic acid
Conference paper

Continuous process for the aqueous carbonation of serpentinite leachate derived from carbonic acid

T.K. Oliver, B.Z. Dlugogorski and E.M. Kennedy
5th International Conference on Accelerated Carbonation for Environmental and Material Engineering (New York, USA, 21/06/2015–24/06/2015)
2015
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Abstract

We present a modelling approach for the continuous aqueous carbonation of serpentinite leachate derived from carbonic acid, suitable for practical application to large-scale CO2sequestration. Experiments involved bubbling of gaseous carbon dioxide (CO2) at a partial pressure of 1 bar into an aqueous suspension of thermally activated serpentinite. Isothermal heating of the ground mineral (-53 μm) at 720 °C for a total period of 30 min resulted in a reactive mineral showing some development of forsterite from the predominantly antigorite basis, with residual hydroxyl content of 53.9 %. An Avrami-Erofe'ev solid state model was fitted to early stage dissolution data (<10 % Mg extraction) and this was used in conjunction with a kinetic formulation of the carbonate system to model continuous mineral dissolution. Dissolution over a contact time of 5 min was sufficient to produce an alkalised solution that was then degassed in a batch operation at 30°C yielding nesquehonite. X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses were used to assess changes to the heat activated serpentinite prior to and following dissolution. ICP-OES analysis, and alkalinity measurements were used to estimate magnesium (Mg) and carbon elemental balances.

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