Abstract
Chemical and physical structure properties of coal macromolecules are the main microscopic factors affecting coal wettability. Numerous studies on coal structures have found that lignite, as a coal of low metamorphic degree, shows more-complicated macromolecular structures than other types of coal, and the macromolecular structure of lignite can better promote coal wettability than other low metamorphic coals with similar physical pore structures. To investigate the underlying reasons, lignite samples from the main coal producing areas of China were analyzed via X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy, and physical methods were used to construct two-dimensional and three-dimensional models of lignite macroscopic molecular structures to study its effect on coal wettability. The results indicated that aromatic layer spacing of lignite was considerably large and showed a low degree of aromatization with irregular arrangement and less directional degree. The macroscopic mole...
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