Spiral concentrator (including spiral chute) is a kind of spiral chute, which is made up of 3 to 6 spiral grooves, which are made of rubber tire, ceramic, lined steel plate or inner surface of heat treated cast iron, But in recent years gradually replaced by the village FRP. After the slurry is fed into the spiral groove, the ore particles rotate downward along the trough in the pulp. Due to the action of gravity, friction and water flow, the ore particles are separated according to the shape of the ore particles and the specific gravity, and are called flow-membrane beneficiation. Heavy minerals near the inner edge of the spiral groove, light mineral near the outer edge of the spiral groove, fine mud and most of the water near the outermost spiral groove, divided into concentrate, ore, tailings and fine mud four ore belts, and then were take.
Spiral concentrator has the advantages of simple structure, small area, less power consumption and large processing capacity per unit area (from single head to 3 to 4 heads) and is widely used for roughing and sweeping. Processing ore size: spiral concentrator 2 ~ 0.074mm, spiral chute 0.4 ~ 0.02mm. In recent years, China's Xinjiang Institute of Metallurgy developed rotary screw chute, processing granularity of 1 ~ 0.08ram, after a sorting can be obtained concentrate, without the use of shaker selection. In the cocoa sea ore used to deal with information rock tantalum niobium ore. Replaced the original process of spiral concentrator and shaker, the recovery rate has improved. Austrian Professor Bouao developed a tower spiral concentrator, canceled the concentrator, daily processing capacity of 25 ~ 30t, in India, South Africa to deal with wolframite and iron ore. Australian production of LG. HG-type spiral concentrator using composite section and different helical pitch helical groove for sorting heavy sand mineral mass of material, the sorting effect is good, enrichment ratio.