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The experimental determination of hydromagnesite precipitation rates at 22.5–75ºC

Published online by Cambridge University Press:  05 July 2018

U.-N. Berninger ,
G. Jordan ,
J. Schott  and
E. H. Oelkers
U.-N. Berninger*
Affiliation:
Géoscience Environnement Toulouse, CNRS-UPS-OMP, 14 av. Édouard Belin, 31400 Toulouse, France Department für Geo- und Umweltwissenschaften, LMU, Theresienstr. 41, 80333 München, Germany
G. Jordan
Affiliation:
Department für Geo- und Umweltwissenschaften, LMU, Theresienstr. 41, 80333 München, Germany
J. Schott
Affiliation:
Géoscience Environnement Toulouse, CNRS-UPS-OMP, 14 av. Édouard Belin, 31400 Toulouse, France
E. H. Oelkers
Affiliation:
Géoscience Environnement Toulouse, CNRS-UPS-OMP, 14 av. Édouard Belin, 31400 Toulouse, France Department of Earth Sciences, UCL, Gower Street, London WC1E 6BT, UK
*
* E-mail: berninger@get.obs-mip.fr
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Abstract

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Natural hydromagnesite (Mg5(CO3)4(OH)2·4H2O) dissolution and precipitation experiments were performed in closed-system reactors as a function of temperature from 22.5 to 75ºC and at 8.6 < pH < 10.7. The equilibrium constants for the reaction Mg5(CO3)4(OH)2·4H2O + 6H+ = 5Mg2+ + 4HCO3– + 6H2O were determined by bracketing the final fluid compositions obtained from the dissolution and precipitation experiments. The resulting constants were found to be 1033.7±0.9, 1030.5±0.5 and 1026.5±0.5 at 22.5, 50 and 75ºC, respectively. Whereas dissolution rates were too fast to be determined from the experiments, precipitation rates were slower and quantified. The resulting BET surface areanormalized hydromagnesite precipitation rates increase by a factor of ~2 with pH decreasing from 10.7 to 8.6. Measured rates are approximately two orders of magnitude faster than corresponding forsterite dissolution rates, suggesting that the overall rates of the low-temperature carbonation of olivine are controlled by the relatively sluggish dissolution of the magnesium silicate mineral.

Keywords

hydromagnesitecarbon storagecarbonate mineralsprecipitation
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 6 , November 2014 , pp. 1405 - 1416
Creative Commons
Creative Common License - CCCreative Common License - BY
© [2014] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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