Patent ID: 8206642

Claim:
A slag door system for a metallurgical furnace comprising: a slag door assembly, with a top, a bottom, a left side, and a right side, the slag door assembly outwardly pivoting from the top between a first position and a second position; and one or more wing walls, each disposed in close proximity to the sides of the slag door assembly and substantially parallel to a plane defined by the right or left side of the slag door assembly as the slag door pivots from the first position to the second position, the one or more wing walls extending outward from a sidewall of the furnace and disposed in close proximity to a threshold of the furnace such that the one or more wing walls substantially occupy the gap between the left or right side of the slag door and the furnace when the slag door is between the first position and the second position to reduce air infiltration into, and heat loss from, the furnace.