The influence of floatation velocity ( Stokes velocity

0.1-0.5 m/s) on separation and removal of 50-200 μm inclusions is studied by established

a moving model of inclusions at steel-slag interface and in liquid metal and slag layer continuous zone near the interface. Study results show that with increasing floatation velocity

there is no obvious influence on removal time of less than 50 μm inclusions at steel-slag interface

but the separation and removal time of 50 μm to 150 μm inclusions increases while the separation time of ≥150 μm inclusions reduces

as for instance

for 150 μm inclusions

with the floatation velocity increasing from Stokes velocity to 0.5 m/s

the inclusions separation time reduces from 260 x 10

-5

s to 6 x 10

-5

s.