Abstract: Aiming at the selection and control of operating parameters of electric arc furnace， a multiphysics 3D model is established for the transport and reaction behavior of material， titanium slag and molten iron. The model equations are solved with finite volume method. The results show that， the joule heat， temperature and voltage drop are concentrated in the area around the electrodes， showing strong coupling and non-uniformity of multiple physical fields. The transverse expansion of melting pool slows down obviously with the passage of time， until it stabilizes near the furnace wall， and forms a slag layer. The mass fractions of titanium concentrate and coke in the material layer affect the position of reduction reaction， making it move towards the furnace entrance continuously. The feeding rate of EAF and the reaction rate have a similar trend. When the furnace condition tends to be stable， the formation rate of titanium slag is about 2.4kg·s^-1， and the formation rate of molten iron is about 1.5kg·s^-1.The mass flow rate ratio of the main feed， auxiliary feed and central feed is 20∶22∶9.

Key words: electric arc furnace(EAF); titanium slag; numerical simulation; heterogeneous reaction; VOF(volume of fluid)model; dynamic mesh