Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By means introducing treating material
Patent
1992-10-29
1994-02-15
Kastler, Scott
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By means introducing treating material
266143, 222603, C21C 106, C21B 714, B08B 1502
Patent
active
052860086
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a system for inerting a casting vessel, such as a traversable ladle or torpedo vessel, used for transporting molten metal, the vessel being used when tapping a blast furnace. With the vessel positioned below the molten metal outlet opening at a transfer station, the vessel cavity is flushed with an inert gas both above the cavity inlet and during inflow of the molten metal into the vessel, in such a manner that contact between the molten metal surface in the vessel and the atmosphere is effectively prevented.
A related system of this type is disclosed in German Patent No. 39 03 444 in which inert gas is forced into the interior of the casting vessel through a flexible feed line in the vicinity of the vessel while positioned below the molten metal outlet opening at a transfer station. A disengageable coupling is attached to the casting vessel, and a stationary pipe is connected to that coupling on the outer surface of the vessel having a through opening in the wall thereof. Such openings are arranged to lie above the maximum molten metal level in the vessel and below the inlet opening of the casting vessel at its upper edge.
The drawback of such arrangement is that all casting vessels used for transporting molten metal in a metallurgical operation must be provided with an inlet opening or openings in the vessel wall thereof, such that special consideration must be taken with a realization that such openings must penetrate both the outer metal jacket and the conventional refractory lining of the casting vessel And, such openings are unusually made after the vessel finishing operation which is time consuming and uneconomical.
And, when a casting vessel is relined due to wear such openings which again need be made involve additional time-consuming treating operations.
Despite the care taken in the provision of such openings it is difficult to assure that the molten metal or slag will not flow into such openings and plug them despite the specified distance between the molten liquid level and the open end of the vessel. The plugging occurs while filling the vessel with molten metal and only leads to expensive maintenance work.
Moreover, the prior art system requires the coupling and uncoupling of the flexible inert gas feed line to or from the stationary pipe on the vessel which demands additional operations and care, normally carried out manually, can involve a complex operation especially when the casting vessel is Positioned below a casting platform since pressurization of the feed line with inert gas is controlled normally on or below the casting platform. Improper coupling and uncoupling and improper inert gas feed control can lead to serious damage to the entire system and to the undesired outflow of inert gas.
The aforementioned drawbacks result in added costs due to increased investment and maintenance, and results in added safety risks.
SUMMARY OF THE INVENTION
The present invention is intended to improve upon the prior art arrangement as aforedescribed, for inerting casting vessels used for transporting molten metal such that the inert gas outlet opening can be pressurized with inert gas via one or more permanently attached feed lines, and such pressurization can be made and monitored from a single specified location so as to minimize the investment and maintenance costs.
More particularly, the system according to the invention includes at least one inert gas blowpipe arranged in such manner in the vicinity of the molten metal outlet opening at a transfer station yet it does not intersect the stream of the inflowing molten metal. The blowpipe is located outside the free space profile of the casting vessel during the approach and return of the casting vessel at the transfer station, and the blowpipe terminates at a spaced distance from the cavity inlet through which the molten metal flows, and produces an inert gas stream at its free end facing the casting vessel which stream enters into the casting vessel cavity adjacent the stream of molten met
REFERENCES:
patent: 4538670 (1985-09-01), LaBate
patent: 4840297 (1989-06-01), Weekly et al.
de Haas Hans
Grutzmacher Klaus
Hammer Uwe
Krause Erhard
Lowenstein Manfred
Kastler Scott
Klockner Stahl GmbH
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