EXPERIMENTAL STUDY ON THE BEHAVIOR OF SLAG ENTRAPMENT AND INCLUSION REMOVAL IN 44 T LADLE WITH ARGON BLOWING

摘要

The powder entrapment and inclusion behavior in 44 ton ladle with argon blowing was studied in a water model. The effect of gas flowrate on powder entrapment in the ladle was investigated by choosing the mixture of kerosene and vacuum pump oil simulated as slag, and the effects of time and gas flowrate on inclusion removal were investigated by choosing emulsion drops simulated as inclusions. The results show that the critical gas flowrate for powder entrapment was 0.66 Nl/min, and the powder entrapment occurred continuously with those gas flowrates larger than 3.31 Nl/min. Most of the inclusions can be removed in eight minutes, and all the inclusions which can be removed almost disappeared from the system in twenty-eight minutes. The inclusion removal rate decreased first and then increased with the increase of gas flowrate. Furthermore, it had been found that the inclusion removal was in exponential relationship with gas blowing time.