Metallic silicon, also known as crystalline silicon or industrial silicon, is mainly used as an additive to non-ferrous alloys. Metallic silicon is the product that is smelted by quartz and coke in electric furnace, the content of principal component silicon element is in 98% or so (in recent years, contain Si content 99.99% also include in metallic silicon), the rest impurity is iron, aluminium, calcium to wait.