| 摘要 |
<p>The disclosure relates to a method for scavenging of gas through a melt in a ladle by a nozzle disposed in the bottom of the ladle. By varying the gas pressure, the nozzle is caused to assume one open and one substantially closed position. At a low gas pressure, the nozzle allows the passage of a gas flow which is sufficient to keep the nozzle free of the melt but is insufficient to influence the melt proper. At a high gas pressure, the nozzle allows the passage of a gas flow of such magnitude that agitation and refining of the melt take place. The nozzle is, in this instance, of a cross-sectional area of the order of magnitude of between 0.2 and 15 mm2. The differential pressure at substantially closed nozzle, i.e. the difference between the gas pressure in the nozzle and the ferrostatic pressure from the melt, is greater than 0.05 bar, and the differential pressure at open nozzle lies in the range of between 5 and 250 bar.</p> |
