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Mineralogical changes in bentonite barrier within Mock-Up-CZ experiment

机译:模拟CZ实验中膨润土屏障的矿物学变化

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摘要

Mineralogical changes in the bentonite-based barrier of the laboratory Mock-Up-CZ experiment were evaluated by X-ray diffraction. The material of the barrier is a mixture of non-activated bentonite (containing Fe-montmorillonite with Ca~(2+) exchangeable cation) (85 vol.%), quartz sand (10 vol.%) and graphite (5 vol.%). The barrier has been subjected to thermal stress (up to 90 ℃) and synthetic "granitic" water for 45 months. From 70 analysed samples taken at different depth levels and distances from the source of the heat and/or water, 10 show measurable transformation of original smectites to either mixed illite/smectite structure (3 samples) or to beidellite (7 samples). Formation of mixed illite/smectite structure was restricted to the low temperature field (40-50 ℃) whilst beidellite occurs in zones affected by higher temperature (50-80 ℃). The low extent of smectite transformation (1-2 wt.%) is due both to the relatively short time of the experiment in contrast to the duration of similar processes in nature and also to a limited supply of potassium cations from synthetic water used for hydration. Along with the above mentioned changes, newly formed gypsum bordered by illite aureol was detected in the upper part of the experimental set-up, i.e. in the zone in direct contact to the source of the water. Gypsum formation is interpreted as due to the oxidation of pyrite, a phase available either from the original bentonite where it is a common accessory or from the graphite used in the system due to heat transfer. In contrast to the non-transformed mixture the several mm wide illitic aureol of gypsum clusters shows a significantly lower ion exchange ability.
机译:通过X射线衍射评估了实验室Mock-Up-CZ实验中基于膨润土的屏障的矿物学变化。阻挡层的材料是未活化的膨润土(含有具有Ca〜(2+)可交换阳离子的铁蒙脱石)(85体积%),石英砂(10体积%)和石墨(5体积%)的混合物)。屏障已经经受了热应力(高达90℃)和合成的“粒状”水45个月。在从不同深度水平和距热源和/或水源距离的70个分析样品中,有10个显示出可测量的原始蒙脱石向伊利石/蒙脱石混合结构(3个样品)或贝得石(7个样品)的转变。伊利石/蒙脱石混合结构的形成仅限于低温场(40-50℃),而贝得石则发生在受高温影响(50-80℃)的区域。蒙脱石转化率低(1-2 wt。%),这是由于与自然界中类似过程的持续时间相比,实验时间相对较短,而且由于用于水合的合成水中钾阳离子的供应有限。与上述变化一起,在实验装置的上部,即与水源直接接触的区域中,检测到以伊利石金刚烷为边界的新形成的石膏。石膏的形成被解释为是由于黄铁矿的氧化,黄铁矿是一种常见的附件,可以从原始的膨润土中获得,也可以由于传热而从系统中使用的石墨中获得。与未转化的混合物相比,几毫米宽的石膏簇的伊利特金刚烷醇显示出明显较低的离子交换能力。

著录项

  • 来源
    《Applied clay science》 |2010年第2期|10-15|共6页
  • 作者单位

    Charles University in Prague, Institute of Geochemistry, Mineralogy and Mineral Resources Albertov 6, Prague 2, 128 43, Czech Republic;

    Charles University in Prague, Institute of Geochemistry, Mineralogy and Mineral Resources Albertov 6, Prague 2, 128 43, Czech Republic Czech Geological Survey, Geologicka 6, 152 00 Prague 5, Czech Republic;

    Charles University in Prague, Institute of Geochemistry, Mineralogy and Mineral Resources Albertov 6, Prague 2, 128 43, Czech Republic;

    Institute of Chemical Technology in Prague, Department of Analytical Chemistry, Technicka 5, 16628 Prague 6, Czech Republic;

    Institute of Chemical Technology in Prague, Department of Analytical Chemistry, Technicka 5, 16628 Prague 6, Czech Republic;

    Masaryk University in Brno, Faculty of Science, Institute of Geological Sciences, Kotlarska 2, 611 37 Brno, Czech Republic;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ca-bentonite; thermal and hydration effect; mineralogical changes; illite; mixed I/S; beidellite;

    机译:钙膨润土;热和水合作用;矿物学变化;伊利石混合I / S;贝得石;
  • 入库时间 2022-08-17 13:55:25

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