LL Spiral Chute. Spiral chute is a type of new gravity separation equipment, which is applicable to separate metallic minerals granularity between 4 —, such as iron, ilmenite, chromite, pyrite, tungsten ore, tin ore, tantalumniobium ore, gravel mine, zirconite and rutile as well as other nonferrous metals, rare metals and nonmetallic minerals with adequate gravity difference.