BOPI 11 BR/2024 REPERTOIRE NUMERIQUE 22 (73) Paul Wurth S.A., 32, rue d'Alsace, 1122 LUXEMBOURG (LU) (74) S.C.P AKKUM, AKKUM & Associates, No. 1777, rue 6.261, Yaoundé 2, Auditorium Jean Paul II boulevard, Face Brigade de Gendarmerie, Mbankolo, B.P. 4966, YAOUNDE (CM). (57) A method for reducing carbon footprint in operating a metallurgical plant for producing pig iron (P), the method comprising the steps of: (a) pre-heating iron ore fines (A) in a first electric preheater (10) based on Joule effect and/or microwave heating to a temperature above 600 °C to obtain pre-heated iron ore fines (B), (b) partially reducing the pre-heated iron ore fines (B) in one or more fluidized bed reactors (50) in the presence of a hot reducing gas (J) to obtain partially reduced iron (K, L); (c) feeding the partially reduced iron (K, L) to a submerged arc furnace (70) comprising a bath of molten métal with a top slag layer; (d) further reducing and melting the partially reduced iron (K, L) within the submerged arc furnace (70) in the presence of a carbonaceous material (M) to obtain molten pig iron (P); wherein, in step (b), the hot reducing gas (J) comprises hydrogen (D), syngas (I), off-gas (O) of the submerged arc furnace, other off-gases (H) from the metallurgical plant, or mixtures of two or more thereof, wherein said syngas (I) is produced from natural gas or biomethane (F), blast furnace gas (G), off-gas (O) of the submerged arc furnace (O), other off-gases from the metallurgical plant (H), or mixtures of two or more thereof in the presence of air or oxygen enriched air, steam or carbon dioxide (E) in one or more reforming reactors (40), wherein, in step b), the hot reducing gas (J) has a temperature above 550 °C, and wherein, in step b), the partially reduced iron (K, L) has a metallization degree of 55 to 75 %, preferably 60 to 70 %. Planche Unique - Fig. 1
RkJQdWJsaXNoZXIy MTM1NDc3MA==