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The blockage of bottom blowing tuyere(s) has a significant impact on the refining efficiency in the converter steelmaking process. In this paper, the effect of different arrangements of tuyere(s) blockage on the mixing efficiency was investigated in a 100 t converter with six bottom tuyeres. Both hydraulic experiment and numerical simulation were employed and their results agree well in terms of mixing time. The flow characteristics were also discussed. The results show that partial blockage of tuyere(s) strengthens the flow circulation in the horizontal direction of the molten bath and breaks the barrier between the independent stirring sub-zones, which enhances the overall mixing of molten bath. Besides, there is a critical value of the bottom blowing flow rate to influence the mixing time, and too large bottom blowing flow rates will cause violent oscillation of the molten bath.