Patent ID: 6627256
Filing Date: 2003-09-30
Classification: C21C

Abstract:
A method of coating slag on at least a portion of a converter having a bottom and a barrel with trunnion sides which needs repair comprising the steps of:causing at least some of molten slag produced in the converter to remain on the bottom of the converter after tapping, downwardly blowing a gas from a top-blown lance, thereby splashing said molten slag, controlling the lance height as measured, from the converter bottom, to an outlet of said lance, to about 0.7-2.9 m while controlling the gas flow rate to about 250-600 Nm3/min, combining, after the start of said gas blowing, remaining molten slag with a slag solidifier comprising an oxide selected from the group consisting of MgO and CaO, wherein said slag solidifier is controlled to provide a ratio of solid phase in said slag to about 0.50-0.70, controlling the height of said slag splashing and amount of slag sticking to said converter wall, and splashing said molten slag onto said barrel to uniformly and stably cover the entire trunnion sides.