TWO STAGE REDUCTION OF IRON ORE : SHAFT FURNACE PLUS MELT REDUCTION FURNACE WITH REDUCING GAS RECYCLE

摘要

This invention relates to a method of making iron from iron ore by subjecting an iron oxide feedstock such as iron ore to a solid reduction with a reducing gas fed from a melt-reducing furnace (briefly sometimes "melting furnace") and then supplying the feedstock to the melting furnace for melt reduction thereof, more particularly a method capable of using a low grade fuel and maintaining and improving the reaction efficiency by applying various controls to evolved gas which is utilized in the reaction.