TY - GEN
T1 - Continuous process for the aqueous carbonation of serpentinite leachate derived from carbonic acid
AU - Oliver, T. K.
AU - Dlugogorski, B. Z.
AU - Kennedy, E. M.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84964799612&partnerID=8YFLogxK
UR - https://researchrepository.murdoch.edu.au/id/eprint/31088/
UR - http://toc.proceedings.com/28625webtoc.pdf
M3 - Conference Paper published in Proceedings
AN - SCOPUS:84964799612
T3 - 5th International Conference on Accelerated Carbonation for Environmental and Material Engineering 2015
SP - 238
EP - 253
BT - 5th International Conference on Accelerated Carbonation for Environmental and Material Engineering 2015
PB - AIChE
T2 - 5th International Conference on Accelerated Carbonation for Environmental and Material Engineering 2015
Y2 - 21 June 2015 through 24 June 2015
ER -