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| 超声诱导纳米气泡破裂对砂岩铀矿孔隙结构损伤的影响 |
| Effects of Ultrasound-Induced Nanobubble Rupture on Pore Structure Damage of Sandstone Uranium Ore |
| 投稿时间：2025-04-23 修订日期：2025-04-28 |
| DOI： |
| 中文关键词: 纳米气泡 孔隙结构 砂岩 微观损伤效应 |
| 英文关键词:nanobubbles pore structure sandstone microscopic damage effect |
| 基金项目:国家自然科学基金面上项目(52374126) |
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| 中文摘要: |
| 本研究采用单因素实验方法，探讨了超声诱导纳米气泡破裂对砂岩铀矿孔隙结构的损伤机制，重点分析了超声时间（0.5 h—3 h）与超声功率（0.6 kW—1.4 kW）对试样孔隙率变化率的影响。通过扫描电镜观察微观形貌变化，并结合核磁共振技术定量表征孔隙结构演变特征。结果表明，超声诱导纳米气泡破裂处理可显著提升样品孔隙率，分别由32.75%、34.25%增至38.96%、41.55%，对应的孔隙率变化率为18.96%和21.32%。T?谱分析显示，谱峰右移，说明孔隙平均尺寸增大；中小孔占比下降，大孔占比显著上升。SEM图像进一步证实，超声诱导纳米气泡破裂可有效重构砂岩孔隙结构。研究成果为地浸采铀过程中的储层增渗提供了理论依据与技术支撑。 |
| 英文摘要: |
| This study systematically investigated the damage mechanism of pore structure in sandstone uranium ore induced by the rupture of nanobubbles under ultrasonic excitation, using a single-factor experimental approach. The effects of ultrasonic time (0.5 h–3 h) and ultrasonic power (0.6 kW–1.4 kW) on porosity variation were thoroughly examined. The microstructure changes observed by scanning electron microscopy , and combined the technology of nuclear magnetic resonance quantitative characterization of pore structure evolution characteristics. The results showed that ultrasound-induced nanobubble rupture significantly increased the porosity of the samples from 32.75% and 34.25% to 38.96% and 41.55%, respectively, with corresponding porosity change rates of 18.96% and 21.32%. NMR T2 spectral analysis revealed a rightward shift of signal peaks, indicating an increase in average pore size, with a decrease in the proportion of small and medium pores and a marked increase in large pores. SEM images further confirmed that ultrasonic-induced rupture of nanobubbles effectively restructured the pore architecture of sandstone. These findings provide theoretical and technical support for enhancing reservoir permeability in in-situ uranium leaching processes. |
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