The atomic structure of silicon determines that the silicon atom has a certain conductivity, but since there are no apparent free electrons in the silicon crystal, the conductivity is as good as the conductivity of the metal and increases with temperature, so it has semiconductor properties. Internationally, commercial silicon is generally divided into metallic silicon and semiconductor silicon, and metallic silicon is mainly used to make polycrystalline silicon, monocrystalline silicon, silicon aluminum alloy, and silicon steel alloy compounds. Semiconductor silicon is used to make semiconductor devices. In general, silicon is mainly used to make high purity semiconductor, high temperature resistant material, optical fiber communication material, organic silicon compound, alloy, etc. Widely used in aerospace, electrical and electronic, construction, transportation, energy, chemical, textile, food. Used in light industry, medical, agriculture and other industries.