Method of operating an open hearth furnace

C - Chemistry – Metallurgy – 21 – C

Patent

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39/70, 53/73

C21C 5/04 (2006.01) C21C 5/48 (2006.01) F27B 3/22 (2006.01)

Patent

CA 1193103

ABSTRACT Oxygen is blown into an open hearth furnace beneath the surface of the molten metal through a jacketed tuyere each tuyere angled toward the center of the furnace. A high volume of jacketing coolant is injected through two separate annular passageways around the oxygen to form a large skull around the tuyere. Like numbers of tuyeres are positioned on each side of the furnace taphole to project through the furnace back wall lining. Each tuyere is below the molten metal bath line and is inclined towards the center of the furnace at an angle between the tuyere center line and the furnace back wall lining of from about 45° to about 60°.

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