Define flux. Write a note on leaching process. - Vidyadip

Question

Define flux. Write a note on leaching process.

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Answer

Flux:
A flux is a chemical substance added to the concentrated ore during smelting in order to remove the gangne to form easily fusible slag.
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.

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