润湿
煤
吸附
烟煤
接触角
化学工程
表面能
材料科学
煤矿开采
化学
复合材料
有机化学
工程类
作者
Mingzhong Gao,Liu Na,Yun Zhao,Yiting Liu,Weilin Zhou,Luming Li,Jing Xie,Jie Deng
标识
DOI:10.1016/j.ijmst.2022.11.003
摘要
The internal mechanism of the high hydrophobicity of the coal samples from the Pingdingshan mining area was studied through industrial, element, and surface functional group analysis. Laboratory testing and molecular dynamics simulations were employed to study the impact of three types of surfactants on the surface adsorption properties and wettability of highly hydrophobic bituminous coal. The results show that the surface of highly hydrophobic bituminous coal is compact, rich in inorganic minerals, and poorly wettable and that coal molecules are dominated by hydrophobic functional groups of aromatic rings and aliphatic structures. The wetting performance of surfactants as the intermediate carrier to connect coal and water molecules is largely determined by the interaction force between surfactants and coal (Fs-c) and the interaction force between surfactants and water (Fs-w), which effectively improve the wettability of modified coal dust via modifying its surface electrical properties and surface energy. A new type of wetting agent with a dust removal rate of 89% has been developed through discovery of a compound wetting agent solution with optimal wetting and settling performance. This paper provides theoretical and technical support for removing highly hydrophobic bituminous coal dust in underground mining.
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