Smelting process of silicon metal
Silicon metal, also known as crystalline silicon or industrial silicon, is mainly used as an additive for non-iron based alloys. Silicon metal is a product smelted by quartz and coke in the electric heating furnace. The content of main component silicon element is about 98% (in recent years, 99.99% Si content is also included in silicon metal), and the remaining impurities are iron, aluminum, calcium and so on.
Belongs to energy-intensive manufacturing silicon metal smelting, silicon metal production in our country already has a long history, along with the national energy policy tightening and the development of energy conservation and emissions reduction, and to the promotion of the new energy, has become the primary silicon metal smelting products and processes, a lot of domestic new energy enterprises construction metal silicon, polycrystalline silicon, monocrystalline silicon, solar cells and so on a series of circulation industry chain, The next few years will certainly affect the development of China's entire energy field and the application of new energy.
Necessity of producing silicon metal for chemical use
China's production of silicon metal (silicon content is mainly 98.5%), the original is mainly metallurgical silicon, chemical silicon metal (silicon content is mainly 99.85%) production is mainly developed from the mid-1990s, China's chemical silicon output and l port growth faster. Other new silicon plants. Chemical silicon refers to silicon metal used in the production of organosilicon and polysilicon. Worldwide, the consumption of metallurgical silicon is more than that of chemical silicon, but with the continuous development of science and technology, chemical silicon is used for silicone and semiconductor production and other fields continue to broaden, widely used in the production of silicone monomer and polymer silicone oil, silicone rubber, silicone resin building corrosion, waterproof agent, etc. They have high temperature resistance, electrical insulation, radiation resistance, waterproof and other unique properties.
Used in electrical, aviation, machinery, chemical, medicine, national defense, construction and other departments. As the core electronic components of integrated circuits, more than 95% are made of semiconductor silicon, which is the backbone of the contemporary information industry. The optical fiber in the fiber optic cable widely used in the "information superhighway" is also made from silicon metal. Under normal circumstances, the price per ton of chemical silicon metal is $300-400 higher than that of metallurgical silicon metal in the international market. Therefore, it is necessary to vigorously develop chemical silicon metal production in order to meet the export and domestic demand, improve the economic benefits of silicon metal enterprises and product quality.
