• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>European Journal of Medicinal Chemistry: Chimie Therapeutique >Change of sandstone microstructure and mineral transformation nearby UCG channel
【24h】

Change of sandstone microstructure and mineral transformation nearby UCG channel

机译：UCG频道附近砂岩微观结构和矿物转化的变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In order to study the evolution law of surrounding rock microstructure of underground coal gasification, and to reveal the principle from the change of mineral composition and organics in rock, the sandstone nearby the gas transmission channel was used as the tested rock. In this paper, the rock was heated at 300, 400, and 500 degrees C, simulating the heat convective environment of the gas transmission channel. The mineral, organic functional groups, and microstructure of sandstone transformation products were detected by XRD, FTIR, and SEM. It is concluded that the kaolin in the sandstone gradually transforms into metakaolin with the increase of temperature, meanwhile the carboxyl group and the oxygenic functional group decrease. The generation of metakaolin and the precipitation of organics increase the number of fractures in samples, which is the main reason for the compressive strength and elastic modulus for the sandstone decreases with increasing temperature for temperatures greater than 500 degrees C. The microscopic manifestation is the appearance of a large number of flocs on the surface. Macroscopically, the exterior appears as a grayish shell. The flow resistance and the adsorption property are weakened, and the permeability is enhanced.
机译：为了研究煤炭地下气化过程中围岩微观结构的演化规律，从岩石矿物成分和有机物的变化揭示其变化规律，以输气通道附近的砂岩为试验岩石。在本文中，岩石分别在300、400和500摄氏度下加热，模拟气体输送通道的热对流环境。通过XRD、FTIR和SEM检测了砂岩转化产物的矿物、有机官能团和微观结构。结果表明，随着温度的升高，砂岩中的高岭土逐渐转变为偏高岭土，同时羧基和含氧官能团减少。偏高岭土的生成和有机物的沉淀增加了样品中的裂缝数量，这是砂岩抗压强度和弹性模量随着温度升高而降低的主要原因，温度超过500摄氏度。微观表现为表面出现大量絮状物。从宏观上看，外观呈灰色外壳。流动阻力和吸附性能减弱，渗透性增强。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号