Analysis on the reason of low carbon content of ferric silicon smelted
Ferro-silicon is the ferroalloy composed of iron and silicon. Now ferro-silicon has a wide range of applications. Ferrosilicon can also be used as an alloying element additive, which is widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel. But many people only understand the use of ferrosilicon, do not understand the smelting and smelting of ferrosilicon problems will be found. In order to deepen our understanding of ferrosilicon, ferrosilicon suppliers simply analyze the reason of low carbon content of ferrosilicon.
The reason why the carbon content of molten iron is relatively low is that when smelting ferrosilicon, the manufacturer will use coke as a reducing agent, which makes the self-baking electrode easy to increase carbon. Coke brick is used to build iron mouth and iron flow trough. Sometimes, graphite powder is used to spread ingot mold, and carbonaceous sample spoon is used to take liquid sample, etc. In short, there are many opportunities for contact with carbon during the smelting process from the reaction in the furnace until the iron is produced. The higher the silicon content in ferrosilicon, the lower the carbon content. When the silicon content in ferrosilicon is about more than 30%, most of the carbon in ferrosilicon exists in the state of silicon carbide (SiC). Silicon carbide is easy to be reduced by oxidation of silicon dioxide or silicon monoxide in crucible. Silicon carbide in ferrosilicon, especially at low temperature, its solubility is very small, easy to precipitation and float. So the silicon carbide left behind is very low, so ferric silicon has very low carbon content.
