Sequential solvent extraction for the modes of occurrence of selenium in coals of different ranks from the Huaibei Coalfield, China

Table 2 Proximate and ultimate analyses and total Se concentrations of different ranks of coals

	%	Bituminous coal	Anthracite	Cokeite
Ultimate analyses	Carbon	78.1	81.3	86
	Hydrogen	4.64	3.52	1.77
	Nitrogen	0.92	0.95	0.56
	Sulfur	0.48	0.25	0.48
Proximate analyses	Moisture	1.26	2.15	5.41
	Volatile matter	24.64	12.06	4.75
	Ash	14.51	13.14	6.94
	Fixed carbon	59.57	72.69	82.58

ISSN: 1467-4866