Question
Write short notes on: Leaching method
✓
Answer
Leaching: Leaching is the first step in the extraction of the metals like aluminium, gold and silver from their ores. In this method the ore is soaked in a particular solution for long time. The ore dissolves in that solution due to specific chemical reaction. The gangue, however, does not react and therefore does not dissolve in that solution. It can be separated easily.
For example, concentration of bauxite, the aluminium ore, is done by leaching method. Bauxite is soaked in aqueous $NaOH$ or aqueous $Na _2 CO _3$ which dissolves the main ingredient alumina in it. This means that bauxite is leached by sodium hydroxide.
For example, concentration of bauxite, the aluminium ore, is done by leaching method. Bauxite is soaked in aqueous $NaOH$ or aqueous $Na _2 CO _3$ which dissolves the main ingredient alumina in it. This means that bauxite is leached by sodium hydroxide.
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