company news about Why is ferrosilicon so low in carbon?

The use of coke as a reducing agent to smelt ferrosilicon, to make carbon self-roasting electrodes easier, the use of coke bricks to build iron mouth and flowing iron groove, sometimes the use of graphite powder coated ingot mold, the use of carbon sample scoop to collect liquid samples, etc. In short, smelting ferrosilicon from the furnace to the iron reaction, the pouring process, the opportunity to contact with carbon is obviously many.
However, the carbon content of ferrosilicon is less than 0.1%, generally 0.05-0.07%, what is the reason?

The higher the silicon content of ferrosilicon, the lower the carbon content of ferrosilicon.  The silicon content of ferrosilicon is about 30%, and most of the carbon in ferrosilicon exists in the state of silicon carbide (silicon carbide). Silicon carbide is easily oxidized and reduced by silicon dioxide or silicon oxide in crucible. Silicon carbide in ferrosilicon, especially when the temperature is low, its solubility is very small, easy to precipitate and float. As a result, the residual silicon carbide in ferrosilicon is very low, and therefore the carbon content of ferrosilicon is very low.