蒙脱石-CO2溶液反应实验研究
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Experimental Study on Reaction of Montmorillonite with CO2 Aqueous Solufion
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    摘要:

    蒙脱石是沉积岩重要的黏土矿物,为探究CO2的注入对蒙脱石产生的影响,明确蒙脱石在CO2水溶液中的 化学行为,利用XRD、XRF、ICP 等手段系统评价了蒙脱石在10 MPa、60 ℃条件下分别与CO2反应7、30 d 时的状 态,重点对比了蒙脱石粉末反应前后固相元素、晶体结构及反应液中离子浓度变化,结合蒙脱石结构特征,明确 蒙脱石在酸中变化的机理。结果表明,蒙脱石与CO2反应后液相中Ca2+ 、Mg2+ 、Al3+ 浓度先上升后下降;Si4+ 浓度先 上升后趋于平稳,固相中d(001)对应晶面在溶解反应后遭到破坏。相对于Al3+ 、Si4+,反应过程中Mg2+、Ca2+、Na+ 的变动幅度相对较大。一方面,由于蒙脱石阳离子交换容量较大,层间Na+、Mg2+、Ca2+等半径较大的活性阳离子 易被半径较小的H+置换出;另一方面,蒙脱石层间分子间作用力为范德华力,相对于静电力较弱,结构易被破 坏。在酸性条件下,硅氧四面体稳定性略强于铝氧八面体,但蒙脱石中非晶态Si 易溶解,使Si 的变化幅度大于 Al 的变化幅度。

    Abstract:

    Montmorillonite is an important clay mineral in sedimentary rocks. In order to explore the impact of CO2 injection on montmorillonite and clarify the chemical behavior of montmorillonite in CO2 aqueous solution,the state of montmorillonite reacting with CO2 for 7 days and 30 days at 10 MPa and 60 ℃ was systematically evaluated by means of XRD,XRF and ICP,The changes of solid elements,crystal structure and ion concentration in reaction solution before and after montmorillonite powder reaction were compared. Combined with the structural characteristics of the original montmorillonite,the change mechanism of montmorillonite in acid was clarified. The results showed that the concentrations of Ca2+,Mg2+and Al3+ in the liquid phase first increased and then decreased after the reaction of montmorillonite with CO2. The concentration of Si4+ increased first and then tended to be stable. The crystal surface corresponding to d(001)in the solid phase was destroyed after the dissolution reaction. Compared with Al3+ and Si4+, the variation range of Mg2+,Ca2+ and Na+ in the reaction process was relatively large. On the one hand,due to the large cation exchange capacity of montmorillonite,the active cations with large radius such as interlayer Na+ ,Mg2+ ,Ca2+ were easy to be replaced by H+ with small radius;on the other hand,the interlayer intermolecular force of montmorillonite was van der Waals force,which was weak relative to electrostatic force,and the structure was easy to be damaged. Under acidic conditions,the stability of silica tetrahedron was slightly stronger than that of alumina octahedron,but amorphous Si in montmorillonite was easy to dissolve,which made the change range of Si greater than that of Al.

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唐洪明,王文卓,彭东宇,王子逸,王昭,周翊.蒙脱石-CO2溶液反应实验研究[J].油田化学,2022,39(3):455-460.
TANG Hongming, WANGWenzhuo, PENG Dongyu, WANG Ziyi, WANG Zhao, ZHOU Yi. Experimental Study on Reaction of Montmorillonite with CO2 Aqueous Solufion[J]. OILFIELD CHEMISTRY,2022,39(3):455-460.

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  • 在线发布日期: 2022-10-20
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