This machine is used for separating ferrous and non-ferrous metals. It can also be used for separating non-metals like coal fluorite and speckstone. The impeller is rotated by vee belt of electric motor and produces centrifugal function resulting in negative pressure. One hand, it sucks into enough air to mix with pulp and fine the foam in order that the mineral can stick on the foam. Then it turns into mineral foam after floating on the pulp. Adjust the height of stopper to control fluid level in order that the available foam can be scrapped out by scrappers.