Behaviors of fine bubbles in the shroud nozzle of ladle and tundish

Yanping Boo, Jianhua Liu, and Baomei XuMetallurgical Engineering School, University of Science and Technology Beijing, Beijing 100083, China

摘 要：<正> Fine bubbles will create when the inert gas is introduced to the high rapid steel stream within the shroud nozzle between ladle and tundish. The collision and attachment among the bubbles and fine inclusions will promote the floatation efficiency of inclusions in the tundish. The behaviors of the bubbles, such as the dispersion in shroud, coalescence and floatation in tundish, are studied. The results show that the maximum sizes of the bubbles in the water and steel flow within the shroud in the length of 1.2 m are 0.70-1.44 mm and 1.53-3.16 mm respectively when the flow rates are 0.006-0.016 m3/s; the terminal velocities of fine bubbles in the water and molten steel within the tundish are 0.02-0.2 and 0.05-0.6 m/s.

关键词：