Main differences between grey and red mud .
|Parameter||Grey mud||Red mud|
|Main components||CaCO3, CaO, SiO2||Fe-oxides, Al2O3|
|Al2O3 losses||8% (low)||15% (moderate)|
|Mud/Alumina mass ratio*||1.5–2 : 1||1–1.2 : 1|
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