DE1981866U - DEVICE FOR HOLDING BACK SLAG DURING TAPING IN TAP CONVERTERS. - Google Patents

Description

Patent attorneys ι-ihg, Walter Meissner oipi-ing. Herbert Tischer

BERLIN 33, HERBERTSTRASSE 22 MUNICH

Telephone: 8 87 72 37 - Wireword: Invention Berlin
Postal checking account: W. Meissner, Berlin West 12282

Bank account: W. Meissner, Berliner Bank A.-G., Depka 36 ι Dcoinrbo / Λοιιιιηι «! m'j λε τ

Berlln-Halensee, KurfUrstendamm 130 1 BERLIN 33 (GRUNEWALD), 25 «Jan *

Herbertstrasse 22 Μ / Ζΐ

ffi 56 424 / 18b Gbm. Ball 1912

Mannesman ^ Aktiengesellschaft, 4 · Büsseldorf 1, Mannesmannuf er

Device for holding back slag during tapping for tapping converters "

The innovation relates to a device for holding back Slag in drawing converters during tapping,

The steel industry has long faced the problem of lacquer-free tapping of Sehmel aggregates. There are therefore already known _s are devices that that purpose · For example, in Thomas converters a blocking body is used whose specific weight is significantly greater than that of the slag, but is less than that of steel "That way it sinks through the slag and floats on the metal thanks to a suitable shape, it is able to hold back the slag in the converter mouth when emptying the converter, while the steel can flow under it, however, such a device cannot be used for tapping converters because of the different type of tapping

Hetierung is based on the task of creating an automatically operating device with which it is possible ₉

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in the case of tapping converters, the stain and slag are separated during the emptying process. is designed as a closure body, the lower end of which is provided with a guide rod that engages through the steel bath in the tapping hole and the upper end of which is detachably connected by a holding rod with a notch-in section. "The diameter of the closure body according to the invention is at least twice that great as that of the tap hole · the density of the Verschlußvörrichtung has the 1 _s i to 1.8 times the value of the specific weight of the liquid slag. The shape of the tapping _{, which has changed due to wear;} Ioehes is taken into account by the fact that the shape of the closure body is adapted to that of the tapping hole. ; -:

The sealing of the tap hole is done in such a way that the closing body introduced with the converter lying down and is lowered onto the metal bath with the help of the notching device so that the guide rod engages in the tapping hole and that the closing body floating on the metal bath Tap hole then closes when the entire melted The amount of steel has flowed out.

The gate parts of the device and mode of operation described are the avoidance of reverse phosphorus, the prevention of ^ des'5 Burn-off of aluminum, silicon and manganese in the pan Γ; due to the leO-containing converter slag and a considerable

Improvement of the pan shelf life. Furthermore, the back ' The aging of the slag with the device according to the invention is a prerequisite for an effective metallurgical aftertreatment the melt in the pan, / for example one Purge gas treatment. \

It has been found that the density of the Steel bath floating closure device must be kept within certain limits to ensure that on the one hand the locking device also by a tough one Slag can penetrate, but on the other hand the tap hole is only closed when the entire melted The amount of steel has flowed out · This is achieved with certainty when the density is 1.1 to 1.8 times the value of the specific gravity of the liquid slag. The appropriate density can be achieved by using a refractory Stone with a suitable spatial weight is chosen or that a lighter stone with metallic struts or Plates is weighted.

The drawing represents an embodiment of the invention according to the invention Device represents and explains how it works.

Fig. 1 shows a converter in section with the locking device.

Fig. 2 shows the locking device with the release device represent.

3 and 4 give further versions of the closure body again.

The converter 1 ″ is in the tapping position so that the molten steel 2 can flow off through the tapping hole 3. Because of its lower specific weight, the slag 4 rests on the steel 2. Above the tapping hole 3, the locking device according to the invention floats 5 »the diameter of which is at least twice as large as the diameter of the tapping hole 3 · A refractory coated metallic or refractory guide rod 6 is attached to the bottom of this locking body 5 and has the task of centering the locking body 5 over the tapping hole 3 A holding rod 7 is attached to the upper end of the closure body 5 and is detachably connected to a release device 8. The release device 8 consists of a tube 9 with struts 10, in the openings 11 of which the support rod 7 &&& closure device is inserted a rod 12 attached to its one Has a known clamping device (not shown) at the end and a drill bit 13 for receiving the holding rod 7 at its other end. In this way, the holding rod 7 can be clamped. When the clamping device is loosened, the locking device falls out of the holder. ■ - """■■-" ■■ \ V ^-::: V ....- '-'- ■' ...-

The form of the verse "ehlußkbody% rs" 5 shown in Figure: 2 is suitable especially if the converter masonry is still / new » The flat disc with the flat base ensures a good sealing of the tapping hole ♦ ■ compartment about 100 melts

- ■ 5- '

the edges of the tapping hole are badly eaten, so that the closure body according to Figure 2 becomes ineffective »In this Case, it is useful to change the shape of the closure body of the Change - to adapt the tapping hole. Here are the teardrop-shaped design according to Figure 3 and the conical design leadership according to Figure 4 proven.

During the tapping process, the sealing device becomes a converter 1 is introduced and the guide rod 6 is lowered into the tapping hole 3. Characterized the closure body 5 after Notching held floating over tap hole 3 «, with the If the liquid level falls, the closure body sinks and "closes" the tapping hole when the total amount of steel

■ ■ "■ -" t * ■

has flowed. In order to hold back the slag completely with certainty, the closure body can already touch down if there is still 200 to 30 kg of steel in the converter together with the slag. If, for example, the slag is to remain in the converter for the next batch, the converter is started up quickly and the remaining amount of steel also remains in the converter. But it is also possible to empty out this remaining amount of steel. A small amount of slag ± m a weak jet can run along with it. * To 'safeguard ^ against this running along, the slag can be blown over the edge of the pan with compressed air through a nozzle attached to the tapping hole » ^: ~ ...-" ■ "" - """'"""'""".'-..; ■ \ - " ^: """.'.-""'"'""' .- ■" ■■ """'--Γ-.'"'- ^r ~ Uach the demolition the slag is emptied over the converter back as usual · ^ _;

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Claims (4)

\ ώοοτδ ^ ι Protection claims: ■ '■■■ 1. Device for holding back the slag during, the tapping with tapping converters with the help of a floating on the metal "bath refractory body, characterized ₉ that the floating body is designed as a closure body (5), the lower end of which with a through the steel bath in the taphole (3) engaging the guide rod (6) and the upper end of which is detachably connected to a release device (8) by a retaining rod (7) 2. Apparatus according to claim 1, characterized in that the diameter of the closure body (5) is at least twice as large as the diameter of the tapping hole, 3. Device according to claims 1 and 2 _9, characterized in that the density of the closure _{device (5 9} 6 ₅ 7) is 1.1 to 1.8 times the specific weight of the liquid slag. 4. Device according to claims 1 to 3 _9, characterized in that the shape of the closure body (5) is adapted to the shape of the tapping hole (3) in the converter (1). f] i A fi