Abstract: Based on the present situation of research on the on-line refinery technology and its application in China, the refinery gas distribution in a molten aluminum purifying reactor on the base of the on-line MINT technology was simulated in an Euler-Euler multiphase flow model. Three incidence angles of molten aluminum were used to calculate multiphase flow in the optimization numerical simulation. The results of numerical calculation and comparative analysis on mixture uniformity showed that the refinery gas distribution changed remarkably with incidence angle, and the best uniformity of gas distribution was gained in a 45° incidence by comparing three simulated results of different incidence angles.