Discharging hole for molten metal in molten metal container, method of operating converter with the discharging hole, and sleeve exchanging device at discharging hole of molten metal container

摘要

To find out a means to shorten the average discharge time by the discharge port of the molten metal with a discharge opening, in particular sleeve-shaped refractories of the molten metal in the molten metal container, including the converter, whereby a challenge to improve the operating efficiency of the converter, etc. do. In order to solve this problem, configuring the discharge port to an upper sleeve 32 and lower sleeve 33 a possibly installed removably on a lower end thereof mounted to the lining refractory in the converter, and the inner hole cross-sectional area of ​​the lower sleeve 33 is then used and 60 ~ 98% of the cross-sectional area of ​​the inner hole in an exchange.