Spiral chute has the following features: simple structure, easily being made, reliable operation , easy maintenance , small floor area , high capacity . It is a high efficiency gravity concentrator of the international advanced standard. It is the newly re-selecting equipment .It is used to separate the iron , stannum , tungsten, tantalum, niobium, gold ore , colliery, monazite , rutile and zircon of the size between 0.3 and 0.02mm , and the other metals and nonmetal minerals of enough proportion deviation .