WATER MODELING STUDY ON THE BEHAVIOR OF INCLUSIONS IN A GAS-STIRRED LADLE WITH TWO TUYERES

摘要

The effects of time, flowrate and mode of gas bubbling on inclusion removal in a 140 ton gas-stirred ladle were investigated by choosing emulsion drops simulated as inclusions in a water model. The results show that most of the inclusions can be removed within eight minutes and all the inclusions which have the possibility to be removed almost disappear from the system in twenty-eight minutes. There are two local optimal gas flowrates for the inclusion removal in the cases of the high and the low gas flowrates respectively, which can be explained by the mechanism of inclusion removal. Argon blowing within six minutes by one tuyere seems to be more efficient for inclusion removal than by two tuyeres, in contrast, in the further course of blowing, argon blowing by two tuyeres is more efficient. The mode of gas bubbling with firstly larger gas flowrate and then smaller flowrate seems to be efficient for inclusions removal. Furthermore, it has been found that the inclusion removal is in exponential relationship with gas blowing time.