DE1111224B - Device for loading and emptying vessels for the negative pressure treatment of molten metals, in particular iron and steel - Google Patents

Description

There are facilities for the negative pressure treatment of molten metals, z. B. of iron and Steel, known from a vacuum pump or similar evacuation device to be connected Vacuum tank and two pipe sockets penetrating the bottom of this tank, whose ends in the to be degassed, z. B. immerse metal in a pan. By The liquid metal to be treated is attached to one of these pipe sockets by means of a so-called "gas lift", d. H. by introducing gases into the metal located in the pipe socket, into the vacuum container introduced. The treated metal flows through the second pipe socket into the under the vacuum vessel located pan filled with the metal to be treated. The clear diameter of the two The pipe socket cannot fall below a certain size because the metal tightness depends on it, which must be dealt with in the unit of time. Here are those associated with the known facility Trouble. Two arranged separately from one another at the bottom of the vacuum container With usable throughput quantities per unit of time, pipe sockets take up a considerable part of the cross section from common pans, e.g. B. of steelworks ladles, a. That is also the case when one decreases with the wall thickness of the pipe socket to the utmost, still justifiable because of the wear and tear. You can not remedy this problem by opening the filler neck, as is the case with Another embodiment of the known device is done concentrically in the return port is arranged. This results in an unacceptably large amount of wear on the nozzle is then washed not only inside, but also outside by the constantly flowing metal.

The invention is based on the object of the above-described, with the known devices to remedy defects associated with the vacuum treatment of metals in an operationally reliable manner. It solves this problem in that the inlet and outlet opening into the bottom of the vacuum tank Return pipe stubs are formed into a twin pipe body, which is made up of the two lengthways after touching nozzles and a steel jacket enclosing them, in which the between the Pipes remaining free spaces are filled with refractory ramming mass. The steel jacket of the The twin tube body is on the outside, at least on its end immersed in the liquid metal, of one Protective jacket made of refractory material surrounded. In the latter, protective sheaths are also useful Device for loading and emptying vessels for negative pressure treatment

of molten metals,
especially of iron and steel

Applicant:

Dortmund-Hörder Hüttenunion

Corporation,
Dortmund, Rheinische Str. 173

Dr. rer. nat. Arnulf servant

and Dipl.-Phys. Robert Hentrich, Dortmund,

have been named as inventors

the supply lines for the "lift" producing gas are arranged, which then, as is known, from the circumference of the inlet nozzle open into these. The twin tube body with its sheath is to be connected vacuum-tight as a unit to the sheet steel casing of the degassing vessel.

Some exemplary embodiments of the device according to the invention are shown in the drawing. They each illustrate longitudinal and cross sections through the facility.

Fig. 1 shows that the inlet and outlet nozzles 1, 2 made of refractory material are thereby formed into a twin tube body in that they, touching lengthways, are inserted into a steel jacket 3 which firmly encloses the nozzles as an inseparable unit. The spaces 4 remaining in the steel jacket are stamped out with refractory material. In the case shown, the lower end of the twin body, which is immersed in the pan, is encased by a protective jacket 5 made of refractory material. The twin body thus created is connected in a vacuum-tight manner at 7 to the steel armor 6 which surrounds the refractory masonry 8 of the vacuum vessel.

So that the space occupied by the pipe socket 1 and 2 in the jacket 3 of the twin body is even smaller the nozzles can be flattened lengthways at the points where they meet

109 648/261

gen 9 received. A twin body constructed in this way is shown in the plan of FIG. From the associated vertical section it can be seen that the nozzles here consist of short pieces, as is known, for example, from the protective tubes on stopper rods, with tongue and groove 10 interlock. It can be useful to connect the joints of the individual pipes, as shown in FIG. 3, to offset against each other.

In the device according to FIG. 1, the gas 11 producing the "lift" is from below into the feed pipe 1 introduced, through a manifold 12, which with its supply line from the twin body is independent.

3 shows a particularly advantageous possibility for the supply of the gases. It is characterized by that in the fireproof protective jacket 5 surrounding the armor 3 of the twin tube the supply lines 13 for the gas producing the "lift" is arranged in such a way that the "Lift gas" enters in a known manner from the circumference of the feed pipe 1 into its interior. .

Claims (5)

PATENT CLAIMS: 1. Device for loading and emptying vessels for the negative pressure treatment of molten metals, in particular iron and steel, which consists of two pipe sockets opening into the bottom of the negative pressure vessel, one of which brings the metal to be treated into the negative pressure container by means of a "gas lift" - and the other discharges the treated metal from the container, and both immerse the same depth in a pan located under the vacuum container and filled with the metal to be treated, characterized in that the inlet and return pipe stubs (1 , 2) are formed into a twin tubular body, which consists of the two lengthwise touching nozzles and a steel jacket (3) surrounding them, in which the free spaces (4) remaining between the tubes (1, 2) are filled with refractory ramming material are. 2. Device according to claim 1, characterized in that the steel jacket of the twin tubular body outside, at least on its end immersed in the liquid metal, of one Protective jacket (5) made of refractory material is surrounded. 3. Device according to claims 1 and 2, characterized in that in which the armor (3) the fireproof protective jacket (5) surrounding the twin pipe and the supply lines (13) for the gas (11) producing the "lift" are arranged, namely in such a way that the "lift gas" from the circumference of the feed pipe (1) enters its interior. 4. Device according to claims 1 to 3, characterized in that the refractory lining the inlet and outlet nozzle (1, 2) consists of refractory pipe pieces with groove and Spring (10) are strung together. 5. Device according to claim 4, characterized in that the joints (10) of the Inlet and outlet nozzles (1, 2) forming refractory pipe sections in the two nozzles against one another are arranged offset. Considered publications:
U.S. Patent No. 1921060. 1 sheet of drawings © 109 648/261 7.61