The industrial silicon smelting is in AC electric reducing furnace, our company use the advanced technology of domestic and foreign to design furnaces, it's with advanced and reasonable technology, it's substantially improved the industrial silicon furnace's power factor and equipments' working efficiency.
The main raw material of smelting industrial silicon includes : silica, carbonaceous reducing agent. Because of the strict requirement of the aluminum, calcium and iron content in industrial silicon, so it has same strict requirement for the raw material.
Requirement of Raw material: SiO2 (in silica)＞99.0%, Al2O3＜0.3%, Fe2O3＜0.15%, CaO＜0.2%, MgO＜0.15%, particle size is 25～80㎜.
The principle to choose carbonaceous reducing agent is: high fixed carbon, low ash specification, good chemical activity. Usually, by using the low-ash petroleum coke or pitch coke as reductant. due to both of the coke have low resistivity, poor reaction ability, we have to use the charcoal (wood brick) with low ash specification, powerful resistivity and strong respond ability to replace some petroleum coke. For sintering the burden we also need use some low-ash soot.
