The simulation test on process parameters for an 150 t ladle bottom argon blowing with geometric simularity ratio 1： 4. 5 water model has been carried out to study the effect of blowing nozzle circle (0. 40 ~0. 70 R)

angle of nozzle at same circle (60° ~ 120°) and flow rate ( 189 ~378 L/h) on mixing time

define the relationship between argon flow rate and surface gas velocity and analyze on slag entrapment phenomena at different flow rate. Results show that the parameters of optimum bottom argon blowing scheme are angle 120°

0. 7 R double nozzle at same circle and blowing flow rate 378 L/h (corresponding to real flow rate 600 L/min) ； the optimum wire feeding location is at 0. 4R； and in soft blowing the critical slag entrapment bottom flow rate is 110 L/h (corresponding to real flow rate 175 L/min).