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Effects of OH$$^{-}$$ activity and temperature on the dissolution rate of compacted montmorillonite under highly alkaline conditions

Sawaguchi, Takuma ; Tsukada, Manabu; Yamaguchi, Tetsuji ; Mukai, Masayuki 

The dependences of the dissolution rate of compacted montmorillonite on activity of OH$$^{-}$$ (a$$_{rm OH}$$-) and temperature (T) were investigated. The dissolution rate of montmorillonite ($$R_{rm A}$$) in compacted pure montmorillonite, which was formulized as $$R_{rm A}$$ = 10$$^{4.5}$$ (a$$_{rm OH}$$-)$$^{1.3}$$ e$$^{-55000/RT}$$, was higher than that in the compacted sand-bentonite mixtures: $$R_{rm A}$$ = 3500 (a$$_{rm OH}$$-)$$^{1.4}$$ e$$^{-51000/RT}$$. The difference can be explained by considering the decrease in a$$_{rm OH}$$- in the mixtures accompanied by dissolution of accessory minerals such as quartz and chalcedony. The dissolution rate model developed for pure montmorillonite is expected to be applied to bentonite mixtures if quantification of the decrease in a$$_{rm OH}$$- is achieved somehow.

Language

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English

Journal

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Clay Minerals

Volume

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51

Number

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2

Pages

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p.267 - 278

Publication Year/Month

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2016/05

Meeting title

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6th International Conference on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement

Held date

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2015/03

Location (city)

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Brussels

Location (country)

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Belgium

Patent information

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PDF

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Paper URL

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https://doi.org/10.1180/claymin.2016.051.2.12

DOI for research data

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Keywords

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dissolution rate; compacted montmorillonite; activity of OH$$^{-}$$; highly alkaline condition

Research Facility

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環境シミュレーション試験棟  

Press Release

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Article of JAEA R&D Review

 :

Deterioration Rate of Buffer Material in Geological-Disposal Sites; Alteration Rate of Compacted Montmorillonite under Highly Alkaline Conditions[/]

Cooperating Institute

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原子力規制委員会原子力規制庁

Accesses

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- Accesses

InCites™

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Percentile:24.47

Category:Chemistry, Physical

Altmetrics

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