在表面活性剂辅助酸化条件下煤炭浸湿溶解的微观机制
Fengyun Liu1, Shengyong Hu1, Xiuwei Sun1
1College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Langmuir : the ACS journal of surfaces and colloids
|December 4, 2024
概括
煤炭湿化-酸化通过减少接触角度和增加孔积,显著改善了煤炭的湿透性和孔状结构. 这种方法增强了煤灰控制和气体透性,有离子液体具有抑制作用.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 煤炭湿化-酸化是改善煤炭灰尘控制和气体透性的关键技术.
- 了解煤炭浸泡溶解过程中的内部转化对于优化这一过程至关重要.
研究的目的:
- 为了研究用酸和表面活性剂复合试剂处理后煤的湿特性和孔隙结构变化.
- 探索矿物溶解和湿溶性质之间的相互作用机制.
- 阐明煤炭湿溶解的微观机制和离子液体的抑制作用.
主要方法:
- 接触角度测量以评估可湿性.
- 低温吸附以分析孔隙结构变化.
- 扫描电子显微镜 (SEM) 和X射线衍射 (XRD) 用于材料表征.
- 分形理论用于分析表面粗度和孔隙连接性.
主要成果:
- 表面活性剂辅助的酸化使煤的接触角度减少了60%左右,从而提高了可湿性.
- 复合试剂处理增加了整体毛孔体积的2.0倍,平均毛孔直径的1.5倍.
- 碎形尺寸 (D1和D2) 分别减少了24.1%和10.3%,表明孔隙连接性有所改善.
- [BMIM]BF4离子液体添加抑制了表面活性剂的活性,增加了接触角和减少了孔径.
结论:
- 煤炭的湿透性与溶解有积极的相关性,导致孔隙体积和尺寸增加.
- 该研究阐明了煤炭湿溶解的微观机制以及离子液体的影响.
- 优化的煤炭湿化-酸性增强了煤炭的性能,改善了防尘和气体透性.
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