The flow field characteristics and open phenomena of slag layer in bath of 150 t CAS ladle refining process have been simulated by 1 : 4 water modelling device to get optimum blowing location and study effect of blowing parameters on bath mixing time. Results showed that the more the flow rate of injection
the bottom blowing rate and depth of lance outlet with shallow immersion of snorkel
the less the mixing time ; and the nearer the distance between bottom blowing location and ladle center
the poor the mixing effect. It is indicated by analysis that with 150 t CAS ladle installed powder injection device
the optimum bottom blowing location is at the place from ladle center 0. 35R (radius of ladle bottom).