Smectite dissolution kinetics at 80°C and pH 8.8

Cama, Jordi; Ganor, Jiwchar; Ayora, Carlos; Lasaga, C.Antonio

doi:10.1016/s0016-7037(00)00378-1

Cited by 201 publications

(126 citation statements)

References 30 publications

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“…Results show that the experimental data can be fitted by an empirical nonlinear rate law within the framework of transition state theory as shown in Nagy and Lasaga (1992). The chlorite dissolution rate varied as a function of the Gibbs free energy over a larger range (-ΔG r >100 kJ/mol) than expected from a linear TST rate law, and was similar to the dissolution rate formulation determined for smectite (-ΔG r >130 kJ/mol) (Cama et al, 2000). Our results indicate that chlorite dissolution is inhibited under a wide range of saturation conditions and might explain the fact that a low reactivity of Cranfield rock was measured by Lu et al (2012) in batch experiments even though a high reactive surface area was determined by Landrot et al (2012).…”

Section: Discussionsupporting

confidence: 60%

“…(Burch et al, 1993;Cama et al, 2000;Carroll et al, 1998;Hellmann and Tisserand, 2006; Nagy et al, 1999;Nagy and Lasaga, 1992). Nagy and Lasaga (1992) propsed to use the following equation to describe gibbsite dissolution rate as a function of ΔGr： where m and n are experimentally determined coefficients.…”

Section: Effect Of Environmental Variables On Mineral Dissolution Kinmentioning

confidence: 99%

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Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Zhang

DePaolo

et al. 2013

International Journal of Greenhouse Gas Control

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Section: Discussionsupporting

confidence: 60%

Section: Effect Of Environmental Variables On Mineral Dissolution Kinmentioning

confidence: 99%

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Zhang

DePaolo

et al. 2013

International Journal of Greenhouse Gas Control

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“…Among the experiments dealing with the dissolution of montmorillonite in an alkaline medium, some have endeavored to determine the kinetic laws; , Cama et al (2000), Huertas et al (2001), Huertas et al (2004), Yamagushi et al (2004), Madé and Michaux (2005) and Tsutsui et al (2005). Temperature and pH are two factors that accelerate the dissolution of montmorillonite.…”

Section: Dissolution Kinetics Of Montmorillonite In An Alkaline Mediummentioning

confidence: 99%

“…Also their beidellite smectite (Ibecco) has lower dissolution rates than Wyoming montmorillonite. Cama et al (2000) shows how difficult it is to obtain kinetic constants. For a single pH of 8.8 at 80 °C, their values (log molSi/m 2 /s) range between -11 and -14 ( Figure 1).…”

Section: Dissolution Kinetics Of Montmorillonite In An Alkaline Mediummentioning

confidence: 99%

“…It is clear that temperature and pH increase the dissolution rate. Conversely, it is necessary to undertake a study similar to that of Cama et al (2000) to determine the effect of the silica content on the dissolution rate between pH 11 and 13.5. The use of kinetic constants for the smectites in numerical models seems to us to be premature, or at least very imprecise, in the absence of such data.…”

Section: Dissolution Kinetics Of Montmorillonite In An Alkaline Mediummentioning

confidence: 99%

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Cement/clay interactions – A review: Experiments, natural analogues, and modeling

2006

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The concept of storing radioactive waste in geological formations calls for large quantities of concrete that will be in contact with the clay material of the engineered barriers as well as with the geological formation. France, Switzerland and Belgium are studying the option of clayey geological formations. The clay and cement media have very contrasted chemistries that will interact and lead to a degradation of both types of material. The purpose of this review is to establish an exhaustive list of laboratory experiments so as to identify the reaction sequences in the evolution of both the clay minerals and accessory minerals during their alteration in an alkaline environment. We review the data on clay dissolution kinetics in this environment, and include an invaluable study of natural analogues that allow one to correlate the phenomena in time. The available data and experiments make it possible to construct predictive numerical models. However, as the quality of the data is inhomogeneous, we recommend a continuation of the thermodynamic and kinetic data acquisition. It is obvious that the numerical modeling of the alkaline disturbance will be more relevant if it can combine the advantages of the different detailed models: mineralogical completeness, combined modeling of the clay and cement media, evolution of the porosity, consideration of the pCO 2 and all the surface reactions.

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Mechanisms and Dynamics of Mineral Dissolution: A New Kinetic Monte Carlo Model

Martin

Manzano

Dolado

2019

Advcd Theory and Sims

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Mineral dissolution is a fundamental process in geochemistry and materials science. It is controlled by the complex interplay of atomic level mechanisms like adatoms and terraces removal, pit opening, and spontaneous vacancy creation that can be gradually activated at different energies. Though the development of a comprehensive atomistic model is key to go deeper into the understanding of this phenomenon, existing models have failed to reproduce the abrupt dependence of the dissolution rate with the Gibbs free energy ( G). Herein, a new atomistic kinetic Monte Carlo (KMC) model is presented, which, invoking the microscopic reversibility of chemical reactions, captures the experimentally observed sigmoid dependence of the dissolution rate and provides new insights on the concomitant dissolution mechanisms. As a salient result, the model predicts the possible existence of unreported close-to-equilibrium dissolution modes where spontaneous vacancies creation and pit opening can occur before adatom and terrace removal.

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Smectite dissolution kinetics at 80°C and pH 8.8

Cited by 201 publications

References 30 publications

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Cement/clay interactions – A review: Experiments, natural analogues, and modeling

Mechanisms and Dynamics of Mineral Dissolution: A New Kinetic Monte Carlo Model

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