Securing device for a cylindrical ceramic hollow body and fireproof ceramic gas purging brick having such type of securing device

Refractory ceramic gas purging brick with the following characteristics in an operational position in a bottom of a metallurgic vessel:

• a) a gas distribution chamber (GV) at a lower end
• b) multiple securing devices (10) which are arranged at a distance to each other in the area of a ceiling (MB) of the gas distribution chamber (GV), where
• c) each securing device (10) holds a cylindrical ceramic hollow body (SR), each of which extends through a ceramic base material (MM) of the gas purging brick up to its upper face, wherein each securing device comprises:
• 1) a base body (12) which, with its bottom (12B) and a circumferential wall (12W), defines a cylindrical space (12R) with a corresponding central longitudinal axis (M),
• 2) the bottom (12B) features an opening (12O) whose longitudinal axis (L) aligns with the central longitudinal axis (M),
• 3) the bottom (12B) features a ring-shaped channel (14N) which extends concentrically around the opening (12O),
• 4) at least an inner wall (14I) of the channel (14N) which is adjacent to the opening (12O) consists of a material which is plastically ductile under application of pressure,
• 5) a ring-shaped compact (16) whose radial wall cross-section increases in size upwards from a lower free end (16U), thereby reducing the cross section of the opening (12O),
• 6) a shape of the ring-shaped compact (16) is to be chosen in such a way that it is able to enter the channel (14N) over a small distance in an unloaded manner, before the compact (16) is pressed further into the channel (14N) in an axial direction of the securing device, wherein
• 7) the ring-shaped channel (14N) extends into a discrete element (14), which forms an upper segment of the bottom (12B) and is arranged without any substantial play in the space (12R).