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Pine oil is generally added in the froth...

Pine oil is generally added in the froth floatation process. Explain.

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(1) In the concentration of an ore by froth floatation process, the ore is mixed with water and pine oil. When air is bubbled through the mixture a froth is formed.
(2) The mineral particles in the ore are preferentially wetted by the oil and float on the top in the froth.
(3) The gangue particles are wetted by water and settle down. Thus the mineral can be separated from the gangue and the ore is concentrated.
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