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In a tank or a beaker take the sulphide ore and water and after it put a layer of pine oil on it.now the ore is agitated with a current of compressed air due to which the ore will change in gaseous state and come upwards where it will mixed with the oil and form the froth.this method is generally used for sulphide ores and by this when froth formed then there in the tank the impurities will be satteled at bottom and we will get the pure substance.
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