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 |
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