Slag Forming Routes in Liangang 90t Top-Bottom Combined Blowing Converter

Through the analysis of the experimental data of Liangang 90t top-bottom combined blowing converter, the results show that in order to obtain the optimal dephosphorization effect, the basicity of slag should be controlled at around 4.6, w((FeO)) be controlled at around 16%, and the furnace temperature be controlled at around 1680℃. Through the change channels of actual slag compose in the CaO（MgO）-SiO2-FeO（MnO）fake ternary phase diagrams to compared with the common slag forming routes, it was found that the slag forming routes of Liangang top-bottom combined blowing converter followed the ABC path which is the low FeO slag forming route. The route is mainly applicable to the low phosphorus and sulphur pig iron which is used in steel smelting. By analyzing the advantages and disadvantages of this route, this paper suggests some optimizations in the slag forming process of Liangang.