In order to achieve the purpose of high-efficiency dephosphorization by single-slag method during combined blown converter steelmaking process, CaO-SiO2-FetO-MgO-MnO-P2O5 slag system was taken as research object, and slag-forming route studied. The effects compositions on liquidus contour map phosphorus distribution ratios (recorded Lp) were calculated thermodynamics software FactSage, then the...