Table 1.

Mineral phases (wt.%) of red mud samples in this study.

Mineral	Formula	GX-A-B	GX-B-B	SD-A-B	SD-B-B	HN-A-C
Quartz	SiO2	10	10		-	10
Calcite	CaCO3	-	20	10	10	-
Hematite	Fe2O3	20	40	35	35	50
Hydrogarnet	Ca3Al2(SiO4)2(OH)4	40	-	30	30	-
Sodalite	Na8(Al6Si6O24)Cl2	30	20	-	25	-
Anhydrite	CaSO4	-	10	-	-	-
Cancrinite	Na6Ca2((CO3)2Al6Si6O24)·2H2O	-	-	25	-	-
Gibbsite	Al(OH)3	-	-	-	-	40
		Bayer	Bayer	Bayer	Bayer	Combined