Abstract: The invention relates to a discharge nozzle for an arrangement inside or at the base of a metallurgic vessel with an upper end, preferably for the connection to a metallurgic vessel or to a sliding valve of a metallurgic vessel, and a lower end, whereat a flow-through channel with at least one discharge opening at its lower end is arranged between the two ends, whereat the radially to the outside pointing wall of the flow-through channel is surrounded by a gas-proof case, characterized by the fact that the case surrounds the lower end with at least one discharge opening in a gas proof manner. The invention further relates to a method for operating a bottom discharge nozzle.

Abstract: Regulation of the throughflow of metal melt is provided through a bottom nozzle of a metallurgical vessel having an upper nozzle arranged in the floor of the metallurgical vessel and a lower nozzle arranged below the upper nozzle. At least one inert gas inlet aperture is provided to the melt throughflow aperture, and a sensor is arranged on or in the lower nozzle for determining the layer thickness of metal clogging in the nozzle. The inert gas supply into the bottom nozzle is regulated using measurement signals of the sensor. A bottom nozzle for the metallurgical vessel is provided with a wall of the melt throughflow aperture through the nozzles being formed at least sealed against metal melt and the nozzles being at least partially surrounded by a gas-tight housing. The housing at its lower end encloses the lower nozzle at its periphery in a gas-tight manner and is arranged with a portion of its inner side abutting on the outer side of the nozzle.