Answer:
In this method water is filled
in a tub. Some pine oil is added, some frothing agent is added. Air is blown.
Powdered ore is
added. A rotating paddle agitates the mixture and draws air in it. Lighter ore
particles float on the froth and heavy impurities settles down.
The process in
which metal ore is dissolved in a suitable solvent and then reprecipitated is
called leaching, e.g.,
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