Silicon calcium alloys undoubtedly play a huge role in our lives, but what is the production process of such a product that plays a major role?
At high temperatures, lime and silica first form calcium silicate slag with a lower melting point, making it difficult for the carbon reduction reaction to proceed. Calcium has a low boiling point and is easily volatile to produce calcium vapor. Moreover, SiO2 is reduced to SiO (gas), so the gases discharged from the furnace are CO, Ca (gas) and SiO (gas). The loss of calcium and silicon in the furnace gas is about 10% each. SiO (gas) and Ca (gas) react with carbon when passing through the material layer, and most of them are converted into CaC2 and SiC. Therefore, the reactivity of the carbonaceous reducing agent is very important for smelting silicon calcium alloy. Calcium oxide and silica have the same carbon as CaC2 and SiC at high temperature, which is an intermediate product in the production of silicon calcium alloy. A part of it will remain in the slag, so the production of silicon calcium alloy is smelted by slag method. In essence, the methods of industrial production of silicon calcium alloys are all realized with CaC2 as the transition product. The density of silicon calcium alloy is slightly lower than that of slag, and the silicon calcium alloy is basically concentrated in the upper part of the molten pool during the smelting process, which is the characteristic of smelting silicon calcium alloy. Special measures must be taken to separate it from the slag. According to the above analysis, there are three processes for smelting silicon calcium alloys by the electric carbon thermal (reduction) method, namely, mixed feeding method, layered feeding method and calcium carbide method. The electric silicon thermal (reduction) method is also one of the methods for producing silicon calcium alloy.
Silicon calcium alloy production methods are not limited to these two. Our silicon calcium alloy manufacturers will continue to work hard to produce better products.