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Question
The following question refer to the extraction of aluminium and iron from their ores:
Iron and aluminum ores both, contain impurities. Explain briefly how these impurities are removed in each case.
Solution
| Aluminium | Iron |
| 1. Aluminium ore contains impurities of FeO and SiO2 | 1. Iron ore contains impurities of silica and sand. These are removed by magnetic separation . |
| 2. Bauxite containing FeO is calcinated at high temperature | 2. FeO is oxidized to Fe2O3 |
| 3. Calcinated ore is then treated with NaOH when Al2O3 is converted into soluble NaAIO2 (sodium meta - aluminate) | 3 . The insoluble Fe2O3 and silica can thus be filtered off. |
| 4. The filtrate is hydrolysed to get Aluminum hydroxide which on ignition gives pure alumina ( Al2O3). |
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