Manufacturing method for granulated metallic iron

Details Manufacturing method for granulated metallic iron Manufacturing method for granulated metallic iron

C - Chemistry, Metallurgy

21

B

C21B 13/10 (2006.01) C22B 1/16 (2006.01)

Patent

CA 2519049

A process for producing particulate iron metal through the reducing fusion of a feed material mixture comprising an iron oxide-containing substance, e.g., iron ore, and a carbonaceous reducing agent, e.g., a carbon-containing material, in a moving-bed type heating/reducing oven, wherein especially the content of the sulfur which has come into the particulate iron metal from the carbon-containing material such as coal is minimized. Thus, high-quality particulate iron metal reduced in sulfur content is obtained. The amounts of CaO-, MgO-, and SiO2-containing substances contained in the feed material mixture are regulated so that the slug-forming ingredients have a basicity (CaO+MgO)/SiO2, as determined from the contents of CaO, MgO, and SiO2 in the feed material mixture, of 1.3 to 2.3 and further have an MgO content (MgO) of 5 to 13 wt.%.

L'invention concerne un procédé de production de métal ferreux particulaire par fusion de réduction d'un mélange de matériau de charge contenant une substance contenant de l'oxyde de fer, par exemple du minerai de fer, et un agent réducteur carboné, par exemple, un matériau contenant du carbone dans un four de chauffage/réduction du type à lit mobile, dans lequel la teneur en soufre qui s'est formé dans la métal ferreux particulaire, provenant du matériau contenant du carbone tel que du charbon, est réduite au minimum. Ainsi est obtenu un métal ferreux particulaire de haute qualité, à faible teneur en soufre. Les quantités de substances contenant CaO, MgO et SiO¿2? dans le mélange de matériau de charge sont régulées de telle sorte que les ingrédients formant des pépites ont une basicité (CaO+MgO)/SiO¿2?, déterminée à partir des teneurs CaO, MgO et SiO¿2? dans le mélange de matériaux de charge, allant de 1,3 à 2,3 et présentent également une teneur en MgO (MgO) de 5 à 13 % en poids.

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