Abstract: A tuyere device for introduction of gaseous media under a liquid metal layer comprises a nest block made of refractory material provided with a sleeve incorporated therein, Coaxial metal tubes with at least one central channel and at least one annular channel which are arranged on the side thereof for entering a liquid metal and separately connected to inlets for supplying gaseous media to the metal. The coaxial tubes consist of two sections having different diameters. The first section has a smaller diameter and is used for supplying the gaseous media to the liquid metal. The second section has a larger diameter and is connected to the inlets for supplying gaseous media to the channels of the first section. The second section is also provided with an additional internal tube. The internal tube of the first section is closed on the both ends and filled with a refractory material. The invention provides a possibility to exclude metal break through the operating channels.

Abstract: The invention relates to a refractory ceramic gas bubbling element for a metallurgical crucible and to a corresponding gas bubbling system comprising such a gas bubbling element.