Physical Simulation of Slag-free Tapping Process in Converter

Taking a 120 t converter in a steel plant as the research object, a plexiglass model with a local geometric similarity ratio of 1∶2 was established by local similarity simulation. Four kinds of tap holes with a diameter of 120,140,160 mm and a variable diameter were designed. Combined with two kinds of inner tap holes of flat plate and cross, the simulation experiment of converter tapping mold was carried out to study the influence of tap hole diameter and internal structure on converter tapping process, and optimize the shape of converter tap hole. The results show that the effect of tapping process of converter with variable tap hole is the best, the amount of slag entrapment is 6.2, the success rate of slag retaining is 99.4%, and the remaining molten steel is 28.95 L. The converter tapping process with the variable tap hole and the internal structure of cross tap hole has a good comprehensive effect. The amount of slag entrapment is 1.2, the success rate of slag retaining is 99.9%, and the remaining molten steel is at least 25.27 L, which reduces the slag entrapment during converter tapping and improves the cleanliness of molten steel.