Skip to main content Accessibility help
×
Home

Effects of OH activity and temperature on the dissolution rate of compacted montmorillonite under highly alkaline conditions

  • Takuma Sawaguchi (a1), Manabu Tsukada (a1), Tetsuji Yamaguchi (a1) and Masayuki Mukai (a1)

Abstract

The highly alkaline environment induced by cementitious materials in a deep geological disposal system of high-level radioactive waste is likely to alter montmorillonite, the main constituent of bentonite buffer materials. Over long time periods, the alteration may cause the physical and/or chemical barrier functions of the buffer materials to deteriorate. In order to evaluate the long-term alteration behaviour, the dissolution rate, R A (kgm−3 s−1), of compacted pure montmorillonite (Kunipia-F) was investigated experimentally under conditions of hydroxide ion concentration of 0.10—1.0 mol dm−3 at temperatures of 50—90°C. The dissolution rate data, including those from a previous study at 130°C, were formulated as a function of the activity of hydroxide ions, aOH− (mol dm−3), and temperature, T (K), and expressed as R A = 104.5·(aOH−)1.3·e−55000/RT by multiple regression analysis, where R is the gas constant. The dissolution rate of montmorillonite was greater in the compacted montmorillonite than in the compacted sand-bentonite mixtures. The difference can be explained by considering the decrease in aOH− 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 aOH− is achieved somehow.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Effects of OH activity and temperature on the dissolution rate of compacted montmorillonite under highly alkaline conditions
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Effects of OH activity and temperature on the dissolution rate of compacted montmorillonite under highly alkaline conditions
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Effects of OH activity and temperature on the dissolution rate of compacted montmorillonite under highly alkaline conditions
      Available formats
      ×

Copyright

Copyright © The Mineralogical Society of Great Britain and Ireland 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

References

Hide All
Bauer, A. & Berger, G. (1998) Kaolinite and smectite dissolution in high molar KOH solutions at 35°C and 80°C. Applied Geochemistry, 13, 905916.10.1016/S0883-2927(98)00018-3
Brindley, G.W. & Thompson, T.D. (1970) Methylene blue absorption by montmorillonites. Determinations of surface areas and exchange capacities with different initial cation saturations (clay-organic studies XIX). IsraelJournal of Chemistry, 8, 409415.10.1002/ijch.197000047
Hang, P.T. & Brindley, G.W. (1970) Methylene blue absorption by clay minerals. Determination of surface areas and cation exchange capacities (clay—organic studies XVIII). Clays and Clay Minerals, 18, 203212.10.1346/CCMN.1970.0180404
Ito, M., Okamoto, M., Shibata, M., Sasaki, Y., Danhara, T., Suzuki, K. & Watanabe, T. (1993) Mineral Composition Analysis of Bentonite. PNC TN 8430 93-003, Power Reactor and Nuclear Fuel Development, Corporation, Tokyo (in Japanese).
Japan Bentonite Manufacturers Association (1991) JBAS-107-91 Measuring Method of Methylene Blue Adsorption Value of Bentonite. pp. 1-5 (in Japanese).
Japanese Standard Association (2004) 44 Silica (SiO2), JIS K 0101 Testing method for industrial water. pp. 468-73 in: JIS Handbook 53, Environmental Technology II (Water Contamination), 2004, Japanese Standard Association, Tokyo (in Japanese).
Kubo, H., Kuroki, Y. & Mihara, M. (1998) Experimental investigation on alteration of bentonite by concrete pore fluids. Tsuchi-to-Kiso, The Japanese Geotechnical Society, 46, 3134.(in Japanese).
Lemire, R.J., Fuger, J., Nitsche, H., Potter, P., Rand, M.H., Rydberg, J., Spahiu, K., Sullivan, J.C., Ullman, W., Vitorge, P. & Wanner, H. (2001) Chemical Thermodynamics of Neptunium and Plutonium, pp. 800810, Elsevier, Amsterdam.
Miyoshi, Y., Horiuchi, Y. & Takagi, T. (2015) Present state of methylene-blue adsorption-test for bentonite in Japan. Journal of the Clay Science Society of Japan, 53, 2636.(in Japanese).
Nakayama, S., Sakamoto, Y., Yamaguchi, T., Akai, M., Tanaka, T., Sato, T. & Iida, Y. (2004) Dissolution of montmorillonite in compacted bentonite by highly alkaline aqueous solutions and diffusivity of hydroxide ions. Applied Clay Science, 27, 5365.10.1016/j.clay.2003.12.023
Rand, M.C., Greenberg, A.E., Taras, M.J. & Franson, M.A. (1976) Standard Methods for the Examination of Water and Wastewater. American Public Health Association, Washington, D.C., pp. 484492.
Rozalén , M.L., Huertas, F.J., Brady, P.V., Cama, J., Garcia-Palma, S. & Linares, J. (2008) Experimental study of the effect of pH on the kinetics of montmorillonite dissolution at 25°C. Geochimica et Cosmochimica Acta, 72, 4224253.10.1016/j.gca.2008.05.065
Rozalén, M., Huertas, F.J. & Brady, P.V. (2009) Experimental study of the effect of pH and temperature on the kinetics of montmorillonite dissolution. Geochimica et Cosmochimica Acta, 73, 37523766.10.1016/j.gca.2009.03.026
Sato, T., Kuroda, M., Yokoyama, S., Tsutsui, M., Fukushi, K., Tanaka, T. & Nakayama, S. (2004) Dissolution mechanism and kinetics of smectite under alkaline conditions. In: Proceedings of the International Workshop on Bentonite-Cement Interaction in Repository Environment, 14-16 April 2004, Tokyo, NUMO-TR-04-05, pp. A3-38-A3-41.
Savage, D. & Liu, J. (2015) Water/clay ratio, clay porosity models and impacts upon clay transformations. Applied Clay Science, 116117, 16-22.
Savage, D., Bateman, K., Hill, P., Hughes, C., Milodowski, A., Pearce, J., Rae, E. & Rochelle, C. (1992) Rate and mechanism of the reaction of silicates with cement pore fluids. Applied Clay Science, 7, 3345.10.1016/0169-1317(92)90026-J
Sawaguchi, T., Kadowaki, M., Yamaguchi, T., Mukai, M. & Tanaka, T. (2013) Alkaline dissolution behaviour of montmorillonite under compacted conditions. Journalof Nuclear Fuel Cycle and Environment, 20, 7178.(in Japanese).10.3327/jnuce.20.71
The Japan Society for Analytical Chemistry Hokkaido (1994) Analysis of Water, 4th edition. Kagaku-Dojin Publishing Company, Inc., Kyoto, Japan, pp. 181-184 (in Japanese).
Yamaguchi, T., Sakamoto, Y., Akai, M., Takazawa, M., Iida, Y., Tanaka, T. & Nakayama, S. (2007) Experimental and modeling study on long-term alteration of compacted bentonite with alkaline groundwater. Physics and Chemistry of the Earth, 32, 298310.10.1016/j.pce.2005.10.003
Yamaguchi, T., Sawaguchi, T., Tsukada, M., Kadowaki, M. & Tanaka, T. (2013) Changes in hydraulic conductivity of sand-bentonite mixtures accompanied by alkaline alteration. Clay Minerals, 48, 403410.10.1180/claymin.2013.048.2.18

Keywords

Effects of OH activity and temperature on the dissolution rate of compacted montmorillonite under highly alkaline conditions

  • Takuma Sawaguchi (a1), Manabu Tsukada (a1), Tetsuji Yamaguchi (a1) and Masayuki Mukai (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed