A Novel Environmental Route to Ambient Pressure Dried Thermal Insulating Silica Aerogel via Recycled Coal Gangue

Table 1

Elemental analysis of the raw coal gangue (wt.%).

SiO2	Al2O3	CaO	Fe2O3	TiO2	SO3	K2O	MgO	P2O5	MnO	V2O5	σ	Total
43.59	12.05	10.95	9.01	0.50	19.29	2.31	0.61	0.84	0.05	0.10	±0.03	100

Standard deviation.