VERFAHREN ZUR SCHMELZREDUKTION IM ELEKTRO-OFEN.

摘要

A method for smelting reduction in an electric furnace comprises the steps of forming arc (4) between each electrode (3) of an electric furnace (1) and molten metal (5) in the electric furnace (1), charging a reducing agent into the electric furnace (1), blowing inert gas into the molten metal (5) in the electric furnace (1) through each of gas blowing nozzles (12) arranged in the hearth of the electric furnace (1) and feeding powdery material ore into an area, in which the arc (4) is formed. The metal material ore is fed to the arc formation area through a feeding path provided along the center axis of each electrode (3) and having an opening at a lower end of the electrode (3). The gas blowing nozzles (12) are arranged in position within the range of 200 to 1,000mm from a pitch circle of each electrode (3) and circumferentially distant by 5 to 25 DEG from a line connecting between a furnace core and the center of the electrode (3). The metal material ore includes powdery chromium ore. The reducer includes coke, coal and ferrosilicon.