This device is suitable for sorting size 0.3 - 0.02 mm thin material of iron ore, ilmenite, chromite, pyrite, zircon, rutile, monazite, phosphorus B ore, tungsten ore, tin, tantalum ore, niobium ore as well as the proportion of differences and other nonferrous metals, rare metals and non-metallic mineral body. The sorting process is stable, easy to control, allow changes in ore concentration range, enrichment ratio, high recovery rate, small footprint, water consumption, simple structure, large capacity, easy to install, easy operation, small investment and quick advantages.Spiral chute consists of mine homogenizer, crosses (tripod), mine shafts, helical groove, the interception of slots, gathering hopper, tank pillars.Suitable for roughing equipment, widely used in processing tungsten, tin, gold, platinum, iron ore and certain metals, especially in dealing with the application of low-grade placer.