Ceramic refractory stopper

Patent metadata

Field	Value
Publication number	US-9802249-B2
Application number	US-201314347818-A
Country	US
Kind code	B2
Filing date	Mar 22, 2013
Priority date	Apr 16, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The invention relates to a ceramic refractory stopper (a stopper device) for controlling a flow of molten metal at an outlet opening of a metallurgical vessel, such as a tundish.

First claim

The invention claimed is:

1. Ceramic refractory stopper, comprising
a) a rod-shaped stopper body ( 12 ) defining a central longitudinal stopper axis (A) including:
b) at least one fitting ( 16 ) for connecting a gas supply line ( 30 ), and
c) at least one gas channel ( 14 ) of a total length (L) within said stopper body ( 12 ), extending between an inlet section at a first end ( 12 u ) of the stopper body ( 12 ) and an outlet section in a free outer surface area ( 12 o ) at a second end of the stopper body, which second end defining a stopper head ( 12 h ), wherein
d) a filling material is arranged within the gas channel ( 14 ) according to the following conditions:
e) the filling material is a high temperature resistant and particulate material which is defined by solid parts and an open porosity, and arranged as a packed bed which extends along a distance (R) of the gas channel ( 14 ) being ≧25% of the total length (L) of the gas channel ( 14 ) and
f) said solid parts of the high temperature resistant and particulate material infill between 10 and 90% by volume of the gas channel ( 14 ) along said respective distance (R).

2. Ceramic refractory stopper according to claim 1 , wherein the gas channel ( 14 ) extends along more than 50% of its total length (L), parallel to the central longitudinal stopper axis (A).

3. Ceramic refractory stopper according to claim 1 , wherein the gas channel ( 14 ) has a smaller cross-section at its part ( 14 l ) within the stopper head ( 12 h ) and the high temperature resistant and particulate material ( 20 ) is only present in the remaining part ( 14 u , 14 m ) of the gas channel ( 14 ) of larger cross-section.

4. Ceramic refractory stopper according to claim 1 , wherein the gas channel ( 14 ) has a cylindrical shape.

5. Ceramic refractory stopper according to claim 1 , wherein said part of the gas channel ( 14 u , 14 m ), filled with the high temperature resistant and particulate material, has a cross-section of >500 mm 2 .

6. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material ( 20 ) is selected from the group complying with at least one of the following properties:
a) thermal capacity, established in accordance with EN 993-14,15 of more than 0.4 J/gK
b) thermal conductivity, established in accordance with EN 993-14,15 of more than 0.04 W/mK
c) temperature resistance of more than 1000° C.

7. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material is selected from the group consisting of: charcoal, oxidic refractory materials, and non-oxidic refractory materials.

8. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material ( 20 ) is provided by particles with a grain size d90 of 1-10 mm.

9. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material ( 20 ) is arranged as one continuous filling.

10. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material ( 20 ) is arranged as two or more continuous fillings ( 20 . 1 , 20 . 2 ) with a clearance ( 14 i ) between the respective fillings ( 20 . 1 , 20 . 2 ).

11. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material ( 20 ) is covered, as least at one of its free ends, by a high temperature resistant, gas permeable filter ( 22 u , 22 o , 22 . 1 u , 22 . 2 u ).

12. Ceramic refractory stopper according to claim 1 , wherein the solid parts of the high temperature resistant and particulate material infill between 20 and 60% by volume of the gas channel ( 14 ) along said respective distance (R).

13. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material extends along a distance (D) of the gas channel ( 14 ) being ≧50% of the total length (L) of the gas channel ( 14 ).

14. Ceramic refractory stopper according to claim 1 , wherein the high temperature resistant and particulate material ( 20 ) is provided as a preparation comprising: three-dimensional shapes, granules, pellets, fibres, pyramids, cones, spheres.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Nitzl Gerald
• Stranimaier Arno
• Haslinger Hans-Jürgen
• Kaufmann Helmut

Classifications

• B22D41/186 Primary

  with means for injecting a fluid into the melt · CPC title