According to the prototype 100 t ladle in steel works and based on similarity theory
a 1:4 water model is established to study the effect of double nozzle bottom blowing position (0. 54 ~0. 72 R)
angle (45° ~ 180°) and bottom blowing rate (0. 04 〜0.55 m
3
/h) on mixing time and steel-slag interface and get optimum bottom blowing parameters. Results show that the optimum position of gas permeable brick is bottom nozzle distance from ladle bottom center 0. 63 R with angle 180° ; the maximum bottom blowing gas rate is 0. 37 m
3
/h (corresponding prototype 18. 0 m
3
/h)
the soft blowing rate should be less than 0. 12 m
3
/h (prototype less than 6. 0 m
3
/h) and the suggested soft blowing gas rate is no more than 0. 04 m