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.