Table 3

Main differences between grey and red mud [40].

Parameter Grey mud Red mud
Main components CaCO3, CaO, SiO2 Fe-oxides, Al2O3
Al2O3 losses 8% (low) 15% (moderate)
Na2O losses 2% 5%
Mud/Alumina mass ratio* 1.5–2 : 1 1–1.2 : 1
Alkalinity Low High

*Depending on the bauxite compositions.

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