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 sepatate the iron,stannum,tungsten,tantalum,niobium,gold ore,colliery,manazite,rutile and xircon of the size between 1.3 and 1.02mm,and the other metals and nonmetal minerals of enough proportion deviation.The product is made of the chlorine plastic, the advantage is light, moisture proof, antirust, corrosion proof, low noise,etc.