Method for producing reduced iron pellet and method for...

C - Chemistry – Metallurgy – 21 – B

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C21B 13/10 (2006.01) C21B 5/00 (2006.01) C22B 1/16 (2006.01) C22B 1/248 (2006.01)

Patent

CA 2707423

In a method for producing a reduced iron pellet, when a powder formed article including iron oxide and carbon is heated and reduced in a rotary hearth furnace, a formed article produced using a raw material, in which an average diameter of the iron oxide is 50 microns or less and a ratio of carbon monoxide to carbon dioxide in a reduction zone is from 0.3 to 1, is reduced at a temperature of 1400°C or less, thereby producing a reduced iron pellet in which a metallization ratio of iron is 50 to 85% and a ratio of residual carbon is 2% or less.

L'invention concerne un procédé de production de boulettes de fer réduit. Au cours du procédé de production, on chauffe un produit moulé d'une poudre contenant de l'oxyde de fer et du carbone, dans un four de réduction à sole tournante afin de réaliser un traitement de réduction. Ledit produit obtenu par moulage d'une matière première contenant l'oxyde de fer, dont le diamètre de particule moyen n'est pas supérieur à 50 microns, est réduit quand un rapport monoxyde de carbone/dioxyde de carbone est situé dans une plage de réduction de 0,3 à 1 et une température est égale à 1400 ºC ou inférieure, afin de produire des boulettes de fer réduit présentant un taux de métallisation du fer de 50 à 85 % et une teneur en carbone résiduel en pour cent supérieure ou égale 2 %.

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