PROCESS FOR MELTING COLD IRON MATERIAL

摘要

A process for melting iron material during the production of molten iron, in which cold iron material such as scraps, cold pig iron or reduced iron is charged into a melting furnace. Carbon-containing solid material is fed into a precombustion vessel for primary combustion under supply of an oxygen-containing gas with an sub-stoicheimetric oxygen content of 0.4 to 0.9. Combustion residues of the carbon-containing solid material are separated from the resulting hot reducing gas. The reducing gas is introduced into the melting furnace for secondary combustion under supply of an oxygen-containing gas holding an oxygen concentration corresponding to 0.7 to 1.3 of theoretical air ratio.