Dissolution Rates of Amorphous Silica in Highly Alkaline Solution
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概要
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Cement is an essential materials to construct the subsurface radioactive waste disposal system. However, cementitious materials alter the groundwater pH to highly alkaline condition about 13. To comprehend the effect of such a hyperalkaline condition on the repository surroundings, this study focused on the dissolution rates of amorphous silica at [NaOH]=10−1 mol·dm−3. The used samples were three kinds of pure commercial silica and a natural silica scale which was obtained from inside wall of the hot-water pipe of a geothermal power plant. The observed dissolution rates were interpreted with using the model, which assumed that the particle sizes decrease with the progress of dissolution. Moreover, due to the particle size distribution anticipated in the natural silica scale, this analysis assumed it contained particles with various initial diameters. In the results, (1) all pure silica samples and at least 60 wt% of the silica scale showed good agreement of the activation energy of the dissolution in the range of 77 through 88 kJ·mol−1 in the highly alkaline solution, (2) these rate constants were of the order of 10−8–10−7 mol·m−2·s−1 at around 310 K and were definitely larger than those already reported for quartz, (3) the specific surface area based on BET method was revealed to be an important factor to give the main difference in the dissolution rates between the synthetic silica and the natural silica.
- 社団法人 日本原子力学会の論文
著者
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Niibori Yuichi
Department Of Quantum Science And Energy Engineering Graduate School Of Engineering Tohoku Universit
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Chida Tadashi
Department of Environmental Studies, Graduate School of Environmental Studies, Tohoku University
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KUNITA Masahisa
Department of Geoscience and Technology, Graduate School of Engineering, Tohoku Univsersity
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TOCHIYAMA Osamu
Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku Univers
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Chida Tadashi
Department Of Environmental Studies Graduate School Of Environmental Studies Tohoku University
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Chida Tadashi
Department Of Geoscience And Technology Graduate School Of Engineering Tohoku Univsersity
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Kunita Masahisa
Department Of Geoscience And Technology Graduate School Of Engineering Tohoku Univsersity
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Tochiyama Osamu
Department Of Quantum Science And Energy Engineering Graduate School Of Engineering Tohoku Universit
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Tochiyama Osamu
Department Of Quantum Science And Energy Engineering Faculty Of Engineering Tohoku University
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Tochiyama Osamu
Department Of Nuclear Engineering Tohoku University
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CHIDA TADASHI
Department of Chemical Engineering, Tohoku University
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