Method for operating moving hearth reducing furnace

Details Method for operating moving hearth reducing furnace Method for operating moving hearth reducing furnace

C - Chemistry, Metallurgy

21

B

C21B 13/10 (2006.01) F27B 9/16 (2006.01) F27D 3/00 (2006.01) F27D 3/08 (2006.01) F27D 25/00 (2010.01) F27D 99/00 (2010.01) F27B 9/38 (2006.01) F27D 17/00 (2006.01)

Patent

CA 2308078

A moving hearth reducing furnace is operated, while a gap is provided between a discharging apparatus (1) for discharging reduced iron agglomerates from the moving hearth reducing furnace and the surface of the moving hearth (2). The gap prevents squeezing metallic iron powder formed by reduction of powder included in iron oxide agglomerates into the surface of the moving hearth and the formation of an iron sheet. An iron oxide layer formed on the moving hearth (2) during the operation can be periodically scraped off without shutdown of the furnace.

Pour la mise en oeuvre de ce four de réduction à sole mobile, on ménage un intervalle entre, d'une part la surface de la sole mobile (2), et d'autre part l'appareil de décharge (1) utilisé pour évacuer les agglomérats de fer réduit produits par le four de réduction à sole mobile. Cet intervalle sert à éviter de chasser dans la surface de la sole mobile la poudre de fer métal obtenue par réduction de la poudre contenue dans les agglomérats d'oxyde de fer, et donc de former une feuille de fer. La feuille d'oxyde de fer qui se forme sur la sole mobile (2) pendant le fonctionnement peut s'éliminer par raclage, sans qu'il soit nécessaire d'éteindre le four.

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