Method for making steel

Abstract From the Canadian patent

A method is provided for producing steel from iron oxide-containing raw materials. The raw materials are initially converted in a reduction furnace by direct reduction with a reducing gas to a substantially metallized, sponge iron. The metallized sponge iron is then melted with the addition of additives and possibly fine scrap in a melting vessel filled with a metal melt. Heat and carbon monoxide-containing exhaust gases are formed in the melting vessel due to the reaction of oxygen-containing gases with carbonaceous material. The heat is utilized in part to melt the sponge iron and the exhaust gases are utilized for the direct reduction The melt is then transferred to a further vessel …