Sintering mechanism of EAF bottom ramming mass
At 1250 ° C, a small amount of C4F (C4AF) in the bottom material of the furnace is fused in periclase, and perovskite is also dissolved in C2F in a small amount to form a solid solution. The formed limited solid solution can promote the sintering of the material: when the scrap is melted, C2F decomposes, FeO solid dissolves in MgO to form the R0 phase, CaO forms a calcium-rich liquid phase or precipitates CaO crystals or Si02 forms C2S, and C3S changes from MgO + C2F RO + SiL, complete the sintering process. The furnace bottom dissolution is limited by time, temperature, reasonable particle size grading and knot density. The corrosion reaction is slow and slight, and the reaction is cyclic. When the next furnace steel is smelted, after the furnace bottom comes into contact with molten steel, C2F decomposes again, so that the oxide layer <1 mm thick on the surface of the working layer of the furnace bottom is in a cycle of continuous disappearance and new life. From the point of view of chemical erosion, due to the extremely dense sintered layer, it effectively prevents the penetration of slag into the working layer of the bottom of the furnace, protects the bottom of the furnace, and extends the life of the bottom of the furnace.