Analysis on Physical and Mechanical Properties of Red Mud Materials and Stockpile Stability after Dilatation

Table 2

Chemical composition of the three kinds of red mud (w/%).

Type of sample	Al2O3	SiO2	Fe2O3	CaO	Na2O	K2O	MgO	TiO2	SO3
Bayer red mud from wetting process	20.80 ± 0.18	22.35 ± 0.10	7.73 ± 0.06	18.51 ± 0.19	8.83 ± 0.07	2.41 ± 0.05	1.40 ± 0.02	4.98 ± 0.05	3.00 ± 0.02
Bayer red mud from drying process	20.52 ± 0.09	22.47 ± 0.16	7.69 ± 0.09	18.42 ± 0.07	8.94 ± 0.04	2.50 ± 0.03	1.52 ± 0.07	4.92 ± 0.02	3.01 ± 0.03
Sintering red mud	7.28 ± 0.07	24.02 ± 0.18	8.50 ± 0.05	44.00 ± 0.20	0.69 ± 0.05	0.25 ± 0.03	1.37 ± 0.05	4.17 ± 0.08	1.09 ± 0.02