Kinetics of aqueous alteration of P0798 simulated waste glass in the presence of bentonite

K. Yamaguchi, Y. Inagaki, T. Saruwatari, K. Idemiteu, T. Arima, H. Yoshikawa, M. Yui

研究成果: 書籍/レポート タイプへの寄稿会議への寄与

抄録

Static aqueous alteration tests were performed with a Japanese simulated HLW glass, P0798, in the presence of bentonite in order to understand the effects of bentonite on the glass alteration kinetics and on the associated Cs release. Analogous alteration tests were performed in 0.001M NaOH solution without bentonite for comparison. The results indicated that; 1) at the initial stage of alteration up to 50 days, no remarkable difference was observed in the alteration rate between both cases "with" and "without" bentonite, 2) at the later stage beyond 50 days, however, the rate in the case "with" bentonite was larger than that in the case "without" bentonite. These results on the alteration rate were analyzed by use of a water-diffusion model. In the case "without" bentonite, a good agreement was observed between the model analysis and the experimental results at the initial stage of alteration up to 50 days, however, the model analysis deviated from the experimental results at the later stage beyond 50 days. In the case "with" bentonite, on the other hand, a good agreement was observed even at the later stage to give the value of the apparent diffusion coefficient, A of 3.5×10-21 m2/s. The comparison between both cases suggests that the alteration rate is controlled by the water diffusion in both cases "with" and "without" bentonite, however, the rate is depressed in the case "without" bentonite probably by the protective effects of the alteration layer developing at the glass surface. In the case "with" bentonite, on the other hand, the alteration layer is expected to be less protective. Cesium desorption tests performed for the altered glass and bentonite indicated that most of the cesium dissolved from the glass is retained in the secondary phase of smectite developing in the precipitated layer by sorption with ion-exchange in the case "without" bentonite. In the case "with" bentonite, however, it is likely to be sorbed at bentonite surface.

本文言語英語
ホスト出版物のタイトル29th International Symposium on the Scientific Basis for Nuclear Waste Management XXIX
出版社Materials Research Society
ページ385-392
ページ数8
ISBN(印刷版)1558998896, 9781558998896
DOI
出版ステータス出版済み - 2006
イベント29th International Symposium on the Scientific Basis for Nuclear Waste Management XXIX - Ghent, ベルギー
継続期間: 9月 12 20059月 16 2005

出版物シリーズ

名前Materials Research Society Symposium Proceedings
932
ISSN(印刷版)0272-9172

その他

その他29th International Symposium on the Scientific Basis for Nuclear Waste Management XXIX
国/地域ベルギー
CityGhent
Period9/12/059/16/05

!!!All Science Journal Classification (ASJC) codes

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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