Na-montmorillonite dissolution rate determined by varying the Gibbs free energy of reaction in a dispersed system and its application to a coagulated system in 0.3M NaOH solution at 70°C

Oda, Chie; Walker, Colin; Chino, D.; Ichige, Satoru; Honda, Akira; Satō, Tsutomu; Yoneda, Tetsuro

doi:10.1016/j.clay.2014.02.021

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Moreover, kalsilte also can be used as a heterogeneous catalyst for biodiesel production [41,42] and as an ingredient in dental ceramic materials [43,44]. In a general sense, the dissolution reaction behavior of some minerals such as montmorillonite [45] and diaspore [46] in alkaline solution was described by the rate law reported by Lasaga et al [47]:…”

Section: Synthesis and Characterization Of Two Kinds Of Kalsiomentioning

confidence: 99%

Synthesis of KAlSiO4 by Hydrothermal Processing on Biotite Syenite and Dissolution Reaction Kinetics

Yuan

Luo

et al. 2020

Minerals

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To make potassium from K-bearing rocks accessible to agriculture, processing on biotite syenite powder under mild alkaline hydrothermal conditions was carried out, in which two types of KAlSiO4 were obtained successfully. The dissolution-precipitation process of silicate rocks is a significant process in lithospheric evolution. Its effective utilization will be of importance for realizing the comprehensiveness of aluminosilicate minerals in nature. Two kinds of KAlSiO4 were precipitated in sequence during the dissolution process of biotite syenite. The crystal structures of two kinds of KAlSiO4 were compared by Rietveld structure refinements. The kinetics model derived from geochemical research was adopted to describe the dissolution behavior. The reaction order and apparent activation energy at the temperature range of 240–300 °C were 2.992 and 97.41 kJ/mol, respectively. The higher dissolution reaction rate of K-feldspar mainly relies on the alkaline solution, which gives rise to higher reaction order. During the dissolution-precipitation process of K-feldspar, two types of KAlSiO4 with different crystal structure were precipitated. This study provides novel green chemical routes for the comprehensive utilization of potassium-rich silicates.

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Section: Synthesis and Characterization Of Two Kinds Of Kalsiomentioning

confidence: 99%

Synthesis of KAlSiO4 by Hydrothermal Processing on Biotite Syenite and Dissolution Reaction Kinetics

Yuan

Luo

et al. 2020

Minerals

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“…Thermodynamic data (equilibrium constants and standard molal volume for minerals) were taken from the JAEA-TDB [26] version PHREEQC20.dat (v1.2, 11 March 2021). Kinetic rates for primary minerals were taken from [32,33] and the references within, those for montmorillonite from [34] and C-S-H from [35]. Data for surface areas were from [34,36].…”

Section: Cabaret Model Setup and Parametersmentioning

confidence: 99%

“…Kinetic rates for primary minerals were taken from [32,33] and the references within, those for montmorillonite from [34] and C-S-H from [35]. Data for surface areas were from [34,36]. Ion exchange of Na, K, and Ca from the reactant fluids with the clays in the mudstone was included, and the ion exchange parameters for montmorillonite were taken from [37].…”

Section: Cabaret Model Setup and Parametersmentioning

confidence: 99%

Evolution of the Reaction and Alteration of Mudstone with Ordinary Portland Cement Leachates: Sequential Flow Experiments and Reactive-Transport Modelling

Bateman

Murayama

Hanamachi³

et al. 2021

Minerals

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The construction of a repository for geological disposal of radioactive waste will include the use of cement-based materials. Following closure, groundwater will saturate the repository and the extensive use of cement will result in the development of a highly alkaline porewater, pH > 12.5; this fluid will migrate into and react with the host rock. The chemistry of the fluid will evolve over time, initially high [Na] and [K], evolving to a Ca-rich fluid, and finally returning to the groundwater composition. This evolving chemistry will affect the long-term performance of the repository, altering the physical and chemical properties, including radionuclide behaviour. Understanding these changes forms the basis for predicting the long-term evolution of the repository. This study focused on the determination of the nature and extent of the chemical reaction, as well as the formation and persistence of secondary mineral phases within a mudstone, comparing data from sequential flow experiments with the results of reactive transport modelling. The reaction of the mudstone with the cement leachates resulted in small changes in pH with the precipitation of calcium aluminium silicate hydrate (C-(A-)S-H) phases of varying compositions. As the system evolves, secondary C-(A-)S-H phases re-dissolve and are replaced by secondary carbonates. This general sequence was successfully simulated using reactive transport modelling.

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Controlled oxidative etching of gold nanorods revealed through in-situ liquid cell electron microscopy

Wang

Bai

et al. 2020

Sci. China Mater.

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Na-montmorillonite dissolution rate determined by varying the Gibbs free energy of reaction in a dispersed system and its application to a coagulated system in 0.3M NaOH solution at 70°C

Cited by 6 publications

References 19 publications

Synthesis of KAlSiO4 by Hydrothermal Processing on Biotite Syenite and Dissolution Reaction Kinetics

Synthesis of KAlSiO4 by Hydrothermal Processing on Biotite Syenite and Dissolution Reaction Kinetics

Evolution of the Reaction and Alteration of Mudstone with Ordinary Portland Cement Leachates: Sequential Flow Experiments and Reactive-Transport Modelling

Controlled oxidative etching of gold nanorods revealed through in-situ liquid cell electron microscopy

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