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首页> 外文期刊>Environmental Science & Technology >Biotite-Brine Interactions under Acidic Hydrothermal Conditions: Fibrous Illite, Goethite, and Kaolinite Formation and Biotite Surface Cracking
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Biotite-Brine Interactions under Acidic Hydrothermal Conditions: Fibrous Illite, Goethite, and Kaolinite Formation and Biotite Surface Cracking

机译：酸性水热条件下黑云母与盐水的相互作用：纤维伊利石，针铁矿和高岭石的形成以及黑云母表面的开裂

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摘要

To ensure safe and efficient geologic CO_2 sequestration (GCS), it is crucial to have a better understanding of CO_2-brine-rock interactions under GCS conditions. In this work, using biotite (K(Mg,Fe)3AlSi3O10(OH,F)2) as a model clay mineral, brine-biotite interactions were studied under conditions relevant to GCS sites (95 °C, 102 arm CO*, and 1 M NaCl solution). After reaction for 3-17 h, fast growth of fibrous illite on flat basal planes of biotite was observed. After 22-70 h reaction, the biotite basal surface cracked, resulting in illite detaching from the surface. Later on (96-120 h), the cracked surface layer was released into solution, thus the inner layer was exposed as a renewed flat basal surface. The cracking and detachment of the biotite surface layer increased the surface area in contact with solution and accelerated biotite dissolution. On biotite edge surfaces, Al-substituted goethite and kaolinite precipitated. In control experiments with water under the same temperature and pressure, neither macroscopic fibrous illite nor cracks were observed. This work provides unique information on biotite-brine interaction under acidic hydrothermal conditions.
机译：为了确保安全有效的地质CO_2封存（GCS），至关重要的是要更好地了解GCS条件下的CO_2-盐水-岩石相互作用。在这项工作中，使用黑云母（K（Mg，Fe）3AlSi3O10（OH，F）2）作为模型粘土矿物，在与GCS站点有关的条件（95°C，102臂CO *和1 M NaCl溶液）。反应3-17小时后，观察到伊利石纤维在黑云母的平坦基面上快速生长。反应22-70小时后，黑云母基底表面开裂，导致伊利石从表面脱离。稍后（96-120小时），破裂的表面层释放到溶液中，因此内层作为更新的平坦基面暴露。黑云母表面层的破裂和脱离增加了与溶液接触的表面积，并加速了黑云母的溶解。在黑云母边缘表面上，沉淀了Al-取代的针铁矿和高岭石。在相同温度和压力下用水进行的对照实验中，未观察到宏观的纤维伊利石或裂纹。这项工作提供了在酸性热液条件下黑云母与盐水相互作用的独特信息。

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  • 来源
    《Environmental Science & Technology》 |2011年第14期|p.6167-6174|共8页
  • 作者

    Yandi Hu; Jessica R. Ray; Young-Shin Jun;

  • 作者单位

    Department of Energy, Environmental & Chemical Engineering, Washington University, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental & Chemical Engineering, Washington University, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental & Chemical Engineering, Washington University, St. Louis, Missouri 63130, United States;

  • 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);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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