Patent ID: 6630010
Filing Date: 2003-10-07
Classification: C21B,F27B,Y02P

Abstract:
A method of producing granular metallic iron, the method comprising:heating a formed raw material including S and comprising a carbonaceous reductant and a substance containing iron oxide in a reduction melting furnace to subject the iron oxide contained in the formed raw material to solid-state reduction; and carburizing reduced iron resulting from the solid-state reduction with carbon contained in the carbonaceous reductant to cause the reduced iron to melt, while separating off gangue components contained in the formed raw material and causing resulting molten metallic iron to coalesce into the granular metallic iron, wherein an atmospheric gas present in proximity to the formed raw material in the carburizing and melting step has a reduction degree of not less than 0.5; and the formed raw material is blended with a calcium oxide source during preparation thereof to adjust a basicity (CaO/SiO2) of a slag forming component contained in the formed raw material to a value within a range between 0.6 and 1.8.