Experimental studies of CO2-rock interaction at elevated temperatures under hydrothermal conditions
Experimental studies of CO2-rock interaction at elevated temperatures under hydrothermal conditions
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DOI：
10.2343/geochemj.39.417
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发表时间：
2005-10
影响因子：
0.8
通讯作者：
A. Ueda;Koichi Kato;T. Ohsumi;T. Yajima;H. Ito;H. Kaieda;R. Metcalfe;H. Takase
中科院分区：
文献类型：
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作者：
A. Ueda;Koichi Kato;T. Ohsumi;T. Yajima;H. Ito;H. Kaieda;R. Metcalfe;H. Takase
已经进行了热液温度下二氧化碳-水-岩石相互作用的实验，以研究溶解和沉淀现象，包括在二氧化碳封存到地热田期间可能发生的从岩石中提取钙的现象。将蒸馏水样品暴露在温度为 25°C、压力高达 6 MPa 的 CO2 气氛中。然后，所得溶液分别与来自 Ogachi 热/干岩田的花岗闪长岩样品和拉长石在 200°C 和 120°C 下反应。与CO2反应的溶液中的钙浓度是与N2而不是CO2反应的溶液中的两倍。结合热力学计算的结果，这些观察结果表明，钙可以很容易地从岩石（硅酸盐）中释放出来，并且在二氧化碳封存到地热田期间可能以 CaCO3 和/或 CaSO4 的形式被去除。
Experiments on CO2-water-rock interaction at hydrothermal temperatures have been performed to investigate dissolution and precipitation phenomena, including Ca extraction from rocks that might occur during CO2 sequestration into geothermal fields. Distilled water samples were exposed to a CO2 atmosphere at a temperature of 25°C and pressures up to 6 MPa. The resulting solutions were then reacted with granodiorite samples from the Ogachi hot/dry rock field and labradorite, at 200°C and 120°C respectively. The calcium concentrations in the solutions that had reacted with CO2 were twice those with N2 instead of CO2. Combined with the results of thermodynamic calculations, these observations indicate that calcium can be released from rocks (silicates) easily and might be removed as CaCO3 and/or CaSO4 during CO2 sequestration into geothermal fields.