EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

Based on in-depth investigation of blast furnace slags composition and viscosity it was found that the conditions of blast furnace synthetic and industrial slags could be characterized by slag index “a”: a = (k1CaO + k2MgO + k3TiO2)/(k4SiO2+k5Al2O3+k6FeO+k7MnO). Here coefficients k1, k2, k3, k4, k5 , k6 , k7 characterize known values of coulomb forces in ion structure of multi-component slags, % The viscosity of homogeneous slag  as a function of temperature and chemical composition could be estimated by the following formula: relationship m = (Aa2 + Ba + C) exp(U/RT)10-5, where Т – absolute slag temperature, оК; U - activation energy, J/mole; R – universal gas constant, J/mole оК; А, В, С – constant coefficient of parabolic dependence of viscosity from temperature, es-timated based on experimental investigation of composition and viscosity of industrial blast furnace slags. The viscosity of heterogeneous slag could be estimated of the following formula mg = A(100-CSR)• m, where А – fraction of fines below 3 mm in hearth’s coke; CSR –coke strength after reaction, %. The developed formulas re incorporated in a slag model which is used a apart of control and optimi-zation system for several balst furnace of Ukraine and Russia.