The definition of metallic silicon

Metallic silicon, also known as crystalline silicon or industrial silicon, plays a vital role in the industrial field. It is often used as a key additive for non-ferrous alloys and provides indispensable support for many industrial processes. Although silicon is a non-metal in the periodic table, it has a gray metallic color and is hard and brittle. Its content in the earth's crust is as high as 26%, with a relative atomic mass of 28.8 and a density of 2.33g/cm3. In addition, silicon has a melting point of 1410℃ and a boiling point of 2355℃, as well as a resistivity of 2140Ω·m.

The classification of metallic silicon varies according to its iron, aluminum, and calcium content, including many grades such as 553, 441, and 411. Its additional products such as silicon micropowder and edge silicon play an important role in the refractory and concrete industries.

In industrial production, metallic silicon is obtained by the reaction of carbon reducing silicon dioxide, and the chemical reaction formula is SiO2 + 2C → Si + 2CO. After melting, recrystallization and pickling, metallic silicon with a purity of up to 99.7-99.8% can be obtained. This high-purity elemental silicon plays a core role in the production of organic silicon, the preparation of high-purity semiconductor materials and the preparation of special alloys. At the same time, it is also often used as an antioxidant in the refractory industry.