| name of the methods | process |
|---|---|
| hand picking | If the ore particles and the impurities are different in one of the properties like colour, size etc.,Using that property the ore particles are handpicked separating them from other impurities. |
| washing | Ore particles are crushed and kept on a slopy surface.They are washed with controlled flow of water. Less densive impurities are carried away by water flow, leaving the more densive ore particles behind. |
| froth floatation | This method is mainly useful for sulphide ores which have no wetting property whereas the impurities get wetted. The ore with impurities is finely powdered and kept in water taken in a flotation cell. Air under pressure is blown to produce froth in water. Froth so produced, takes the ore particles to the surface whereas impurities settle at the bottom. Froth is separated and This method is mainly useful for sulphide ores which have no wetting property whereas the impurities get wetted. The ore with impurities is finely powdered and kept in water taken in a flotation cell. Air under pressure is blown to produce froth in water. Froth so produced, takes the ore particles to the surface whereas impurities settle at the bottom.Froth is separated and washed to get ore particles. |
| magnetic separation | If the ore or impurity, one of them is magnetic substance and the other non-magnetic substance they are separated using electromagnets. (see Fig.2) |
There are some other methods also for dressing which you will learn at higher