Froth floatation:

is a physical method of separating mineral from the gangue

is a method to concentrate the ore depending on the difference in wetability of gangue and the ore

is used for the sulphide ores

is a method in which impurities sink to the bottom

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(A) The concentration of ore involves physical and chemical methods. Froth floatation method is the physical method for the separating mineral from the gangue.
(B) It is based on the difference in wettability of different minerals.
The metallic sulphide particles of ore are preferentially wetted by oil and the gangue particles by water.
(C) Froth floatation process used for the concentration of sulphide ore.
(D) In this method impurities sink to the bottom and the ore particles rise to the surface alongwith the froth.

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