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标题：Insight into interactions of olivine-scCO 2-water system at 140 °C and 15 MPa during CO 2 mineral sequestration
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作者：Zijing Li ; Jilong Guo ; Zhao Dong 等
期刊名称：Geoscience Frontiers
印刷版ISSN：1674-9871
出版年度：2018
卷号：9
期号：6
页码：1945-1955
DOI：10.1016/j.gsf.2017.12.008
语种：English
出版社：Elsevier
摘要：AbstractCO2mineral sequestration (in ultrabasic or basaltic rocks) has been considered as a promising long-term and stable approach to reduce CO2in the atmosphere and would counteract the effect of global warming. Meanwhile, clays are widely found in ultrabasic reservoirs. In our study, clays were observed in natural olivine samples, which were used for laboratory experiments in a supercritical CO2system at 140 °C and 15 MPa. Initial olivine samples were crushed into two sizes which were large grains of ∼850–1000 μm and powder particles of ∼75–150 μm, with the durations of 400 and 1000 h for the powder and grains, respectively. The results showed amorphous silica was newly formed and this passivating layer could mitigate the water-rock interaction to some extent, but it would not play a long-term prohibited effect on secondary mineral carbonate formation as it is a Fe(III) free silica coating. More interestingly, the secondary carbonates were observed to form near the surface sites where locates more clays. Our findings provide insights into the reaction mechanisms of olivine-scCO2-water interaction process in natural ultrabasic rocks.Graphical abstractDisplay OmittedHighlights•We performed experiments with an olivine-scCO2-water system at 140 °C and 15 MPa.•Formed pure amorphous silica layer would not prohibit long-term interaction.•Clay minerals on olivine grain/powder might affect formed magnesite location.
关键词：KeywordsenCarbon storageCO2mineral sequestrationOlivineMagnesiteClay mineral