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Bauxite
Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world’s main source of aluminium. Bauxite consists mostly of the aluminium minerals. It is a naturally occurring, heterogeneous material composed primarily of one or more aluminum hydroxide minerals, plus various mixtures of silica, iron oxide, titania, aluminosilicate, and other impurities in minor or trace amounts.
Chemical Composition
Hydrous aluminium oxide with impurities such as Silica, Iron, Titanium oxide, Lime etc. Al2O3.XH2O (Where X varies from 1 to 3)
Physical Properties
Bauxite occurs as lumps, boulders and pebbles of variegated colours ranging from ash grey to white to pink or red. Hardness is highly variable. The specific gravity is generally around 2.5 to 2.6. Clayey varieties are also common.
| Al2O3 | Al2O3 43- 56% |
| SiO2 | Between 2-15% |
| Fe2O3 | Up to 20% |
| TiO2 | 4 to 7% |
| CaO | 1% (max) |
| L.O.I | 20-30 % (variable with mineral composition) |
