Answer:
In the froth flotation process,
sulphide ore is to be separated from gangue or earthy impurities. The impure
ore is mixed with water and pine oil in a tank and steam is passed through it.
Now, gangue particles are wetted by water while the ore by oil. With the help
of steam, the sulphide ore rises in the form of a foam while the gangue impurities
settle at the bottom of the container.
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