Multiple hearth furnace for reducing iron oxide

Details Multiple hearth furnace for reducing iron oxide Multiple hearth furnace for reducing iron oxide

C - Chemistry, Metallurgy

21

B

C21B 15/00 (2006.01) C21B 13/00 (2006.01) F27B 9/02 (2006.01)

Patent

CA 2669314

A multiple moving hearth furnace (10) having a furnace housing (11) with at least two moving hearths (20) positioned laterally within the furnace housing, the hearths moving in opposite directions and each moving hearth (20) capable of being charged with at least one layer of iron oxide and carbon bearing material at one end, and being capable of discharging reduced material at the other end. A heat insulating partition (92) is positioned between adjacent moving hearths of at least portions of the conversion zones (13), and is capable of communicating gases between the atmospheres of the conversion zones of adjacent moving hearths. A drying/preheat zone (12), a conversion zone (13), and optionally a cooling zone (15) are sequentially positioned along each moving hearth (30) in the furnace housing (11).

L'invention concerne un four à soles mobiles multiples (10) présentant une enveloppe de four (11) et au moins deux soles mobiles (20) conçues latéralement à l'intérieur de l'enveloppe de four, les soles se déplaçant dans des sens opposés et chaque sole mobile (20) pouvant être chargée à l'aide d'au moins une couche d'oxyde de fer et de matériau carboné à une extrémité, et pouvant décharger un matériau réduit à l'autre extrémité. Une cloison d'isolation thermique (92) est conçue entre des soles mobiles adjacentes d'au moins des parties des zones de conversion (13), et peut permettre la communication des gaz entre les atmosphères des zones de conversion de soles mobiles adjacentes. Une zone de séchage/préchauffage (12), une zone de conversion (13), et éventuellement une zone de refroidissement (15) sont successivement conçues le long de chaque sole mobile (30) dans l'enveloppe de four (11).

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