Is there a single crystal mine in nature? The purification technology and principle of graphite ore? Please detail, thank you!
There seems to be no pure monocrystalline silicon in nature.The order of silicon is: silicon dioxide ore - industrial silicon - polycrystalline silicon - monocrystalline silicon. Monocrystalline silicon is made from polycrystalline silicon by single crystal furnace, and it can also be used to prepare monocrystalline silicon by melting. However, the monocrystalline silicon has a large dislocation density, so the semiconductor device uses drawn monocrystalline silicon as raw material.
According to its production process and uses are different, mainly colloidal graphite, expandable graphite and its products, carbon graphite products and graphite crucible and other deep-processing products.
Chemical purification products: according to their production methods and fixed carbon content of different, natural flake graphite is divided into high purity graphite, high carbon graphite, medium carbon graphite, low-carbon graphite four kinds.
It is worth noting that polysilicon is not made from monocrystalline silicon.At present, the international production and development of graphite products, including graphite products (including mineral processing, chemical purification products) and graphite products two major categories, a number of products.
