Silicon in blast furnace comes from ash in coke and pulverized coal, and gangue (slag) in ore.<br> Coke and pulverized coal, according to their mass, contain about 10% ash. The content of basic oxides in ash is less, mainly SiO2 _ 2. In addition, this part of SiO _ 2 exists in a highly active free state, and SiO _ 2 exists in the form of silicate. Compared with easy reduction, it is the main source of silicon in molten iron. In addition, the coke ash contains SiO2. It is in uniform and close contact with coke, and the thermodynamic and kinetic conditions of its reduction reaction are conducive to the reduction of silicon.<br> The SiO _ 2 used in blast furnace is contained in the gangue of sinter, pellet or natural lump ore. SiO _ 2 mostly exists in the form of silicate, which has high stability and is more difficult to reduce than that in coke and pulverized coal. However, due to the large amount of SiO _ 2 entering the furnace, and the [Si] generated by reduction can form various stable compounds with Fe, the reduction reaction of this part of SiO _ 2 can also occur. Therefore, slag is also a non-negligible silicon source, which has a significant impact on the [Si] content of molten iron.
正在翻译中..