The applicationi of polycrystalline silicon scrap is wider than our though. Polysilicon waste is a by-product during the production of polycrystalline silicon. In the production process of polysilicon, by-products include silicon tetrachloride, hydrogen chloride, chlorine, hydrogen, oxygen, silicon powder, etc.
Recycling silicon-containing materials can save resources. Re-extracting the recycled silicon-containing waste materials and using the extracted silicon for production and can save production costs. For example, photovoltaic companies are expanding the use of recycled silicon wafers. Recycled silicon wafers can reduce the cost per watt of photovoltaic modules, while also reducing waste storage, landfill, transportation and other expenses.
Polycrystalline silicon scrap is an important material in the semiconductor industry, and the recycled polysilicon scrap is very important in semiconductor production. Polycrystalline silicon scrap is also a siliceous raw material in cement production. It is useful to prepare other industrial products, such as hydrogen storage, luminescent, catalytic materials, permanent magnet materials, etc. In addition, studies have shown that polysilicon waste plays an important role in the preparation of silica sol.
Polysilicon Scrap Applications
The silicon content of Polycrystalline silicon scrap is relatively high, generally reaching more than 99.9%. It can replace conventional high-grade silicon metal, such as silicon metal 441, silicon metal 3303, silicon metal 2202. It has small impurities, good use effect, and high cost performance.
The cutting liquid waste from the cutting process of polycrystalline silicon wafers in the solar industry can be recycled and utilized. This kind of silicon mud has a large water content and has a risk of spontaneous combustion. However, as a professional silicon metal manufacturer, Highrise Metal Material has relatively mature technology that can dry silicon sludge. The dried silicon sludge is an ideal raw material for producing metallurgical grade silicon metal. And, some polycrystalline silicon scrap can be grinded into high purity silicon metal powder 3N 4N 5N 6N.