Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1989-05-05
1991-05-28
Kastler, S.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
222603, 222593, 75528, C21C 700
Patent
active
050191594
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a procedure for the introduction of gas into a discharge opening of a matallurgical container in order to prevent or reduce deposits or freezing in the discharge opening, as well as a discharge sleeve for executing the procedure.
During the pouring particularly of metal melts from steel pouring ladles or spreaders, particularly aluminum killed steel has a tendency to form alumina deposits in the discharge opening, which lead to obstructions and early discontinuation of pouring. According to DE-PS No. 35 06 426 it has been known to fight such deposits with the introduction of gas. The gas there is blown in at room temperature with a constant gas stream or also in a pulse like manner.
In another procedure of the generic type (DE-PS No. 28 36 409 ), in which a slide lock is arranged at the discharge opening of the container, a flush gas is blown into the discharge opening through the slide plate with closed lock in order to prevent the freezing of the melt in the opening.
In practice it has been possible to deal with this problem with more or less success with the use of these known procedures.
Starting from this, the current invention is based on the problem to improve the gas introduction in such a manner that the cited deposits or freezing in the discharge opening can be prevented in a simple manner for the duration of the required pouring time.
According to the invention this problem has been solved due to the fact that the gas is heated before entering the discharge opening to at least 1000 degrees Celsius, preferably even beyond the liquid temperature of the metal melt. In this manner the pouring times or temporary closing times can be extended practically as long as desired without any pouring disruptions.
Due to the blowing in of heated gas, the melt in the discharge opening during the pouring does not undergo any appreciable cooling into the temperature range suitable for alumina precipitation or even a clinging to the opening wall due to gelling of the melt.
With the use of a slide lock at the discharge of the container it is possible to completely prevent, in a locked position of the closure, a freezing of the melt in the discharge opening by blowing in heated gas through a locking plate into the discharge opening, provided the gas temperature is above the liquid temperature of the melt.
In the procedure according to the invention the preferred gas to us is an inert gas, such as argon to a gas-solid matter mixture.
The gas can be heated by means of an external heating device or by a discharge sleeve according to the invention in which the cold gas is led for a certain distance through a gas supply line in the upper area of the sleeve which is in contact with the metal melt and is then blown into the melt through a gas permeable insert surrounding the discharge opening. In this manner the gas is heated without problem to beyond the melting point of the melt and a freezing as well as a possible alumina deposit at the opening wall can be prevented for the whole required pouring time.
Advantages of further variations of the discharge sleeves according to the invention are explained in the following description.
It is certainly also possible that heated gas can be blown in a suitable manner into the extended discharge opening, formed by a pouring tube, or through a locking plate.
Embodiments of the invention are explained below based on the drawing. Shown is:
FIG. 1 A procedure according to the invention based on a pouring sleeve arranged in the discharge opening of the container and shown in lengthwise section,
FIG. 2 a procedure according to the invention, applied with a slide lock, in locked position, arranged on the discharge,
FIG. 3 variation of a pouring sleeve in lengthwise section,
FIG. 4 cross section of the pouring sleeve according to FIG. 3 on the line IV--IV,
FIG. 5 further variation of a pouring sleeve in lengthwise section,
FIG. 6 cross section of the pouring sleeve according to FIG. 5 on the line VI--VI,
FIG. 7 fourth variation of a pouring sleeve in lengthwise sect
REFERENCES:
patent: 4207094 (1980-06-01), Diener et al.
patent: 4732607 (1988-03-01), Sugimori et al.
patent: 4746038 (1988-05-01), Ohwada et al.
Muller Bruno
Waltenspuhl Rolf
Kastler S.
Stopinc Aktiengesellschaft
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