Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By means introducing treating material
Patent
1997-08-15
1999-01-05
Kastler, Scott
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By means introducing treating material
C21C 548
Patent
active
058558438
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a gas-porous plug for metallurgical vessels comprising a refractory moulding in which at least one gas passage duct is provided in the form of an interstice running through the plug from a cold side of the plug to a hot side thereof.
Gas-porous plugs of this type are referred to as so-called interstitial flushing devices and function to blow reaction or purification gases into molten metal or metal melts.
In the latter context, such gas-porous plugs are usually used in the base area of a refractory lining of a metallurgical vessel, particularly a steel ladle, and such metallurgical vessels are pressurized with compressed gas through a gas feed pipe.
Conventional gas-porous plugs are known which are constituted as an inner conically shaped refractory moulding or body over which a second outer conically shaped moulding is positioned. In order to define a gap between the inner and outer mouldings, strip-shaped spacers are inserted in the gap or interstices therebetween. Thus, such gas-porous plugs are not monolithic structures.
A peripheral side wall and a base area of such conventional gas porous plugs are also usually provided with a gas-tight, welded sheet metal casing having a base positioned at a distance from the underside or cold side of the gas-porous plug to create a gas feed chamber. A gas feed pipe is welded to the metal base and opens into the latter gas feed chamber.
In another conventional gas-porous plug, the interstice is formed between the side of the sheet metal casing and the refractory moulding. However, such gas-porous plugs are no longer used owing to their relatively low wear resistance.
Another gas-porous plug of a conventional construction is disclosed in DE-OS 43 12 988 in which gas passage ducts are defined as a three-dimensional network in the interior of a monolithically cast refractory moulding utilizing a conventional tensioning device. However, the manufacture of this gas-porous plug is relatively complicated and the inner gas passage ducts are also relatively long which results in comparative high pressure gas losses when in use.
In another conventional gas-porous plug disclosed in DE-OS 38 23 897, threads or strips are inserted into a casting mould utilizing a tensioning device which is pulled or burnt out after the moulding has set. This moulding is also manufactured as a monolithic structure but the tensioning of the individual threads constitutes a relatively complicated manufacturing process.
SUMMARY OF THE INVENTION
This invention is directed to a novel gas-porous plug and the manufacture thereof in a relatively simplified fashion. The gas-porous plug of the present invention is defined by an inner body which is surrounded by an outer body with a peripheral gap therebetween. The peripheral gap is spanned by a plurality of bridges. The inner and outer bodies and the plurality of bridges are formed as a single piece of monolithic cast refractory material.
Preferably, the gas-porous plug is manufactured by placing an open hollow body in the form of a generally conical sleeve having apertures in a side wall thereof into a casting mould with an exterior surface of the sleeve spaced from an interior surface of the casting mould. This hollow body or sleeve is made from material that can be burnt or melted out. The casting mould is then filled with refractory casting compound which fills the sleeve-like body, the openings thereof and a peripheral gap between the exterior of the sleeve and the interior of the mould surface. The sleeve is then burnt or melted out, and the gas-porous plug remains and is defined by a single piece of monolithic cast refractory material formed of an inner body, an outer body and a plurality of bridges therebetween.
The gas-porous plug thus constructed in accordance with this invention displays directed porosity and possesses characteristics of both an interstitial flushing device and a gas-porous plug with individual gas passage ducts. In contrast to conventional interstitial flushing devices, t
REFERENCES:
patent: 5225143 (1993-07-01), Labate, II et al.
patent: 5286004 (1994-02-01), Rothrock, Jr.
patent: 5423521 (1995-06-01), Stover et al.
Kastler Scott
Knollinger Horst
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