Compression of Aggregates of Acid-Leached Coal Gangues: Implications for Coal Mine Backfill

Table 2

Content of elements or compounds of the gangues (%).

Category	SiO2	Al2O3	CO3	Fe2O3	K2O	CaO	MgO	TiO2	Na2O
Percentage	56.08	23.38	9.72	4.397	2.06	1.53	1.15	0.869	0.606
Category	Ba	Zr	S	P	Sr	Cl	Mn
Percentage	0.059	0.0397	0.036	0.028	0.0178	0.016	0.011