Process for melting cold iron material

C - Chemistry – Metallurgy – 21 – B

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C21B 11/02 (2006.01) C21C 1/02 (2006.01) F27B 1/08 (2006.01)

Patent

CA 1333662

Described herein is a process for melting iron material in 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, the process comprising: feeding a carbon-containing solid material into a precombustion vessel for primary combustion therein with supply of an oxygen-containing gas with an oxygen content corresponding to 0.4 to 0.9 of theoretical air ratio; separating combustion residues of the carbon-containing solid material from the resulting hot reducing gas; and introducing the reducing gas into the melting furnace for secondary combustion therein with supply of an oxygen- containing gas holding an oxygen concentration corresponding to 0.7 to 1.3 of theoretical air ratio in total with the oxygen-containing gas supplied to the precombustion furnace.

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