Question

Bayer’s method is used for ______.

Options

• purification of metal

• smelting

• concentration of the ore

• roasting

Answer 1

Bayer’s method is used for concentration of the ore.

Explanation:

Bayer’s process is a chemical leaching technique used to concentrate bauxite ore and obtain pure aluminium oxide (alumina). The raw ore is treated with a hot, concentrated sodium hydroxide solution, which selectively dissolves the amphoteric aluminium oxides into soluble sodium aluminate while leaving insoluble iron oxide and silica impurities behind. By removing this bulk waste (red mud), the process effectively concentrates the metal content before the final reduction stage.