Magnetic Separation : This is based on differences in magnetic properties of the ore components. If the ore particles are magnetic and the non-magnetic material is gaunge this method is used. The finely powdered ore is dropped on a belt moving on two strong electromagnetic rollers. The magnetic and nonmagnetic substances form two separate heaps. The magnetic material forms a heap nearer to the magnetic roller.
Froth Floatation Method : Ores concentrated by froth floatation process are Copper Pyrites and Iron Pyrites The ore contains very small mineral particles which are not easy to separate from gangue. Then froth floatation method is used. Mostly this is used to concentrate sulphide minerals. In this process the ore is finely powdered. It is suspended in water taken in a tank. To the contents a suitable oil like pine oil or olive oil is added. A frothing agent like sodium ethyl xanthate is mixed. Then froth is formed and carries the ore particles with it. The gangue settles down at the bottom of the tank. The froth, if allowed to settle, leaves behind the concentrated ore. The bubbles of the froth formed are stabilized by adding "collectors". The hydrocarbon chains in them possess oily nature and so prevent the ore particles from going into the aqueous layer. The gangue is wetted by water and so remains in the aqueous layer. The gangue is wetted by water and so remains in the aqueous layer.For the ore particles in the suspension to float, the conditioners like lime, sodium carbonate are added.The ore contains very small mineral particles which are not easy to separate from gangue. Then froth flotation is used

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