Cited by 154CO2 Sequestration and Geologic InteractionsPhase Equilibria and ThermodynamicsCrystallization and Solubility Studies

Experimental determination of the solubility product of magnesite at 50 to 200°C

Bénézeth, Pascale, Saldi, Giuseppe D., Dandurand, Jean-Louis, Schott, Jacques·2011·Chemical Geology

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Crossref · 10.1016/j.chemgeo.2011.04.016

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  • The evaporative concentration mechanism cannot explain the precipitation of anhydrous Mg carbonates, and kinetic considerations are needed to justify the formation of these minerals.

    “Therefore, the evaporative concentration mechanism cannot explain the precipitation of anhydrous Mg carbonates, and kinetic considerations are needed to justify the formation of these minerals.24,25”
  • The lower dielectric constant of the medium assisted the dehydration of Mg2+ cations, inducing a homogeneous classical nucleation in bulk solution (not on substrate surfaces), which does not exclude the formation of amorphous and intermediate crystalline phases.

    “It was suggested that the lower dielectric constant of the medium (compared to pure water) assisted the dehydration of the Mg 2+ cations, inducing a homogeneous classical nucleation in bulk solution (not on substrate surfaces), which do not exclude the formation of amorphous and intermediate crystalline phases.”
  • Room temperature precipitation of disordered dolomite and high Mg calcite has been achieved by partially replacing water with ethanol.

    “The room temperature precipitation of disordered dolomite and high Mg calcite has been achieved by partially replacing water with ethanol.”
  • Reacting systems with 75 vol% ethanol, 50 mM MgCl2·6H2O, 10 mM CaCl2·H2O, and 50 mM NaHCO3 yielded protodolomite with close stoichiometry (44 mol% of Mg) to ordered dolomite at 25 °C.

    “Reacting systems with 75 vol% of ethanol, 50 mM of MgCl 2 •6H 2 O, 10 mM of CaCl 2 •H 2 O, and 50 mM of NaHCO 3 yielded protodolomite with close stoichiometry (44 mol% of Mg) to the ordered dolomite at 25 °C.”
  • The 75 vol% ethanol solution decreased the solvation energy by 4.2-8.4 kJ mol-1, thus assisting the dolomitization reactions.

    “Thus, it was argued that the 75 vol% ethanol solution decreased the solvation energy in 4.2-8.4kJ mol -1 , thus assisting the dolomitization reactions.24”

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Authors
Bénézeth, P., Saldi, G. D., Dandurand, J.-L., & Schott, J.
Affiliations
Centre National de la Recherche Scientifique (FR)
Corresponding author
Bénézeth, Pascale
Venue
Chemical Geology
Publisher
Elsevier BV
Published
2011-06
Volume
286
Issue
1-2
Pages
21-31
ISSN
0009-2541 (ISSN-L)
OpenAlex
W2018304277
Cited by
154
References
3
Citations by year
2026: 10 · 2025: 15 · 2024: 9 · 2023: 6 · 2022: 8 · 2021: 16 · 2020: 9 · 2019: 9 · 2018: 15 · 2017: 9 · 2016: 11 · 2015: 5 · 2014: 13 · 2013: 10 · 2012: 8
FWCI
9.07
Type
journal article
Language
en
Open access
closed
Locations
  • Chemical Geology (publishedVersion)
  • HAL (submittedVersion)
Funders
  • Agence Nationale de la Recherche
  • CHIST-ERA
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
  • Physical Sciences › Engineering › Biomedical Engineering › Phase Equilibria and Thermodynamics
  • Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
Keywords
magnesite, solubility product, thermodynamic properties, CO2 sequestration, NaCl solution, Gibbs energy of formation, enthalpy, entropy, heat capacity, temperature dependence

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