off grade silicon

97 Metallic silicon, also known as external silicon or off grade silicon, is mainly used as an additive for non-ferrous alloys. off grade silicon is a product smelted from silica and blue carbon in an electric heating furnace. The content of the main component silicon is about 98% (in recent years, the silicon content of 99.99% is also included in 97 metal silicon), and the remaining impurities are Iron, aluminum, calcium, etc.

When the particle size is too large in the existing off grade silicon smelting process, unreacted silica is easy to enter into the liquid silicon, resulting in an increase in the amount of slag, difficulty in discharging the furnace, a reduction in the recovery rate of silicon, an increase in energy consumption, and even a rise in the furnace bottom. Affecting normal production, resulting in poor product quality of 97 metal silicon, and large heat loss of flue gas generated during 97 metal silicon smelting, and low temperature raw material silica smelting heat absorption is large, and the energy consumption of off grade silicon smelting and The cost is high, and it is not suitable for the continuous production of 97 metal silicon.