A water model of 1: 4 scale has been established to simulate the liquid flowing in the 210 t RH unit

and to study the effect of argon blowing rate (1 000 ~ 1 400 L/min)

snorkel insertion depth (125 ~ 175 mm) and blowing argon hole number (4-6) on mixing time of liquid. Results show that to define the argon blowing rate needs to comprehensively consider the effect of each factor； it is not available to mix liquid as the snorkel inserts too depth ； it is available to get an ideal mixing time with lesser number of upper argons blowing hole and increasing the number of lower argons blowing hole ； and the optimum process parameters are argon blowing rate 3. 87 m

3

/h

snorkel insertion depth 120 mm

upper argon blowing hole number 4 and lower argon blowing hole number 6. The constrained nonlinear optimization question is solved by matlab tool to calculate and get regression equation minimium value of mi

xing time- 27. 02 s.