Process for manufacturing granular iron

C - Chemistry – Metallurgy – 21 – B

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C21B 13/10 (2006.01) C21B 11/08 (2006.01) C21C 1/02 (2006.01)

Patent

CA 2745763

A method for producing granular iron comprising: charging agglomerates formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent onto a carbonaceous material spread on a hearth of a furnace; and heating the agglomerates to thereby reduce and melt iron oxides in the agglomerates, wherein the temperature of the agglomerates in the furnace is set in a range between 1200°C and 1500°C; the oxygen partial pressure in atmospheric gas under which the agglomerates are heated is set to 2.0 x 10-13 atm or more at standard state; and the linear speed of the atmospheric gas in the furnace is set to 4.5 cm/second or more.

L'invention concerne un procédé de production de fer granulaire, qui consiste à : introduire des agglomérats formés à partir d'un mélange de matériaux bruts comprenant une substance qui contient un oxyde de fer et un agent de réduction carboné sur un four sur lequel matériau à base de charbon est déposé, et à chauffer les agglomérats afin de réduire et de fondre l'oxyde de fer contenu dans les agglomérats, caractérisé en ce que : la température des agglomérats dans le four est régulée dans une plage comprise entre 1200 et 1500°C ; la pression partielle de l'oxygène du gaz atmosphérique lorsque les agglomérats sont chauffés étant réglée à 2,0 × 10-13 atm ou plus en termes de valeur à un état standard ; et la vitesse linéaire du gaz atmosphérique dans le four étant réglée à 4,5cm/s ou plus.

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