The main components of dolomite are calcium carbonate and magnesium carbonate. Generally, steel plants use burned light-burned dolomite, which means that the main components are calcium oxide and magnesium oxide. Needless to say, calcium oxide is the main component of lime. Magnesium oxide can increase the magnesium oxide content in the slag and saturate the magnesium oxide in the slag, thereby reducing the loss of magnesium in the furnace lining. That is to say, it plays the role of protecting the furnace lining. The main component of fluorite is calcium fluoride. After it is added, it will quickly form a low melting point compound. On the one hand, it can quickly dissolve the slag, but it will also cause great corrosion to the furnace lining. , now few steel mills use fluorite as a co-solvent, and it has basically been cancelled.