Comparison Of The Advantages Of Silicon Carbide And Ferrosilicon As Deoxidizers

The deoxidation effect of SiC exceeds that of FeSi. Because when deoxidizing with FeSi, the following formula is carried out, and the oxide SiO₂, FeO are formed again, increased the oxygen content in the molten iron.

2FeSi + 3O₂=2 SiO₂+ 2 FeO

If SiC is used for deoxidation, the reaction formula is:

For (FeO)in molten iron:

3(FeO) + SiC = 3(Fe) + (SiO₂) + CO + Q

For [FeO] in slag:

（FeO）+ SiC = (Fe]) + (Si) + CO + Q

Due to the following reaction, the iron oxide in the slag is reduced from 5~15% to 0.5% or less. Such a dramatic change in the reaction characteristics of slag, liquid metal and furnace lining increases the distribution coefficient of S in the slag from 0.5~2.5 to 4.0~17.5, thereby reducing the S content in the metal to 0.035~0.045%, and reducing the slag quantity at the same time. In addition to Si, the gas content in the molten iron is also reduced. Because it can be seen from the formula, CO release can bring out other gases.