Method of controlling slag coating of a steel converter.

摘要

A method of controlling slag coating in a steel converter in which slag is left in the converter after tapping, and a slag solidifying agent is added to the slag to form a coated slag which is used to coat the bottom and/or side wall surface of the converter. The method is performed by a) examining the composition of the slag at the tapping time; b) determining, based on the examined slag and through an equilibrium calculation using thermodynamic data, the amount of solidifying agent per unit weight of the slag necessary for maintaining the liquid volume fraction of the coated slag to a value not greater than about 40 % at the planned tapping temperature of the next charge of steel; c) determining the amount of charge of the solidifying agent based on the calculated required amount of the solidifying agent and the amount of the slag remaining in the converter; and d) adding the calculated charge of the solidifying agent to the slag after tapping, to form a coated slag.