Patent ID: 6596221
Filing Date: 2003-07-22
Classification: B22D,C21C,F27B,F27D

Abstract:
A metallurgical vessel having a tapping apparatus for controlled slag-free withdrawal of liquid metal from a molten metal bath in a lower vessel portion, wherein the tapping apparatus includes a discharge duct which is surrounded by refractory material, the discharge duct including first and second downwardly facing legs with respective tops at which said legs are connected to define a connecting region of said first and second legs, the first leg passes through a side wall of the vessel and has an inlet opening for liquid metal, the inlet opening including an upper edge the second leg has a lower outlet opening for the liquid metal, which can be closed by a closure device, and the discharge duct includes an overflow edge for the liquid metal in the connecting region of the first and second legs, the overlow edge disposed at a height greater than a height of the upper edge of the inlet opening of the discharge duct,characterised in that the first leg of the discharge duct passes through a refractory cladding of the side wall of the lower vessel portion and is integrated into same, in the working position of the vessels the overflow edge is arranged lower than an upper edge of the refractory cladding of the side wall but at a maximum at a height defined by the maximum permissible bath level of the molten metal, and a heating device is provided for heating at least a part of at least one of the refractory material surrounding the discharge duct and a molten metal in the discharge duct.