Method for making molten iron

Details Method for making molten iron Method for making molten iron

C - Chemistry, Metallurgy

21

B

C21B 13/14 (2006.01) C21B 13/10 (2006.01)

Patent

CA 2472427

A method for making molten iron includes the steps of feeding a raw material mixture containing an iron oxide material and a carbonaceous reductant into a heating reduction furnace to reduce iron oxide in the raw material mixture with the carbonaceous reductant into solid reduced iron; transporting the solid reduced iron to a melting furnace; and combustion of a carbonaceous material supplied as fuel to melt the solid reduced iron in the melting furnace for producing molten iron. After the metallization of the solid reduced iron is enhanced to at least 60%, the solid reduced iron is transported to the melting furnace. The amounts of oxygen and the carbonaceous material supplied to the melting furnace are controlled so that the secondary combustion ratio of CO gas in the melting furnace is reduced to 40% or less. The heat transfer efficiency of the secondary combustion heat to the molten iron is preferably increased to at least 60%.

L'invention concerne un procédé permettant de produire du fer fondu. On utilise une matière formée contenant un oxyde de fer et un agent de réduction carboné comme matière première. Un four rotatif en terre et un four de fusion sont reliés. Ledit procédé est caractérisé en ce que la matière formée est d'abord chargée dans un four chauffant de réduction afin d'améliorer le taux de métallisation de 60 % ou plus avant d'alimenter le four de fusion, et en ce que la vitesse de combustion secondaire du gaz CO dans le four de fusion est réglée à 40 % ou moins. Ce procédé permet de supprimer les pertes par fusion de matières réfractaires du four rotatif en terre et du four de fusion tout en produisant du fer fondu à pureté améliorée avec un bon rendement.

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