Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment

Table 1

Proximate analysis and elemental analysis of coal samples of different types.

Coal samples	Proximate analysis/%				Elemental analysis/%
	Mad	Aad	Vad	FCad	Cdaf	Odaf	Hdaf	Ndaf	Sdaf
Beizao lignite	17.16	10.93	41.27	30.64	72.88	15.02	8.66	2.36	1.08
Daliuta long flame coal	10.31	6.22	52.26	31.21	80.21	12.85	4.27	0.86	1.81
Yushuwan gas coal	5.49	2.95	37.41	54.15	83.89	10.09	4.96	0.82	0.24
Xinjulong fat coal	1.55	5.6	30.56	62.29	86.14	6.16	5.32	1.79	0.59
Wugou coking coal	1.86	7.59	10.8	79.75	87.34	4.8	5.71	1.56	0.59
Yangquan anthracite	1.7	3.96	8.02	86.32	91.79	2.31	3.81	1.43	0.66