DE2337956A1 - DEVICE FOR PLUGGING THE TAPHOLE OF CONVERTERS - Google Patents

Description

233795S

CENTRO SPERIMENTALE METALLURGICO S.p.A. Via Castel Romano

Rome, Italy

Device for plugging the tapping hole of converters

The invention relates to a device for plugging the tapping hole of converters for metallurgical processes with a stopper which protrudes from the inside of the converter into the tapping hole and from a holding member to the outside is braced, according to patent 2,217,726.

In such a device proposed according to the main patent, it has been found that some features can be improved. So can with the proposed device the losses, even if only minor

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απ the material contained in the converter not completely can be avoided because the plug is not absolutely perfectly adapted to the contour of the tapping hole. The stopper is after renewed every tapping, and the new stopper therefore has a smooth peripheral surface. The tap hole, however, is subject to the wear and tear that can be traced back to the erosion caused by the outflowing steel and the outflowing slag during tapping is. The tap hole therefore has an irregular shape.

The invention is based on the proposed To improve the functioning of the device and, in particular, to achieve an increased sealing effect.

To solve this problem, the device according to the invention characterized by a solid element of refractory material, which extends into a substantially cylindrical, larger formed as the tap hole head, and expanded by a ring packing, the material of which consists essentially of a Mixture of heat-resistant material in powder form with a binder consists ur; d coherent when cold and when inside of the thermal interval for the setting of the mixture is plastically deformable with increasing temperature, as well as with such Temperatures that are non-deformable are higher than the thermal setting interval, but lower than the operating temperature of the converter after exposure to operating conditions that are longer than those for installing the plug required amount of time.

The essential Vortexl of the device according to the invention is that an improved Abdiditung between the stopper and the tap hole is achieved. In addition, the plug adheres better to the tapping hole and can be removed when it is no longer in use easier to remove.

The advantages achieved according to the invention are based on the modified one Construction of the plug back, which now has an intermediate element, which the connection between the plug and aem

_ ₂ _ 40980 9/04

ADstichloch manufactures.

The intermediate element, which consists of a mixture of heat-resistant material and binder, has a shape that is technologically is suitable to fulfill the function of a packing.

The cohesion of the mixture is sufficient to allow deformation and detachment during normal handling, including during inserting the plug into the tap hole. If the temperatures rise within those limits of the thermal interval between which the mixture hardens, the mixture is plastically deformable. Above after this thermal interval it becomes non-deformable and takes on the properties of a heat-resistant material. this is on chemical and / or ceramic setting and / or on conversions of either the binder and / or the base material traced back.

Another advantage of this mixture is that it has only a low resistance to dynamic impacts, and although this is also due to the chemical and / or ceramic setting and / or to the transformations of the binder and / or the base material.

When the stopper, which is provided with this packing, is pressed against the tapping hole, the packing with the. in contact with the hot wall of the reactor and deforms to remove any surface irregularities that may be present on the To seal the mouth of the tapping hole. Due to the further increasing. The pack then hardens immediately at high temperature and becomes non-deformable, so that the plug and tapping hole are permanently connected to one another. Should the tap hole open are, the stopper can be easily removed, due to the fact that the pack after hardening low resistance to dynamic impacts.

233795Θ

The invention is described below with reference to the drawing illustrated embodiments explained in more detail. The drawing shows in:

1 shows a vertical section through a first embodiment of a plug according to the invention;

2 shows a vertical section through a second embodiment of the plug.

Both in FIG. 1 and in FIG. 2 , the stopper consists of two parts, namely a solid element A made of heat-resistant material and a ring packing B or 1c made from a mixture of materials (heat-resistant material in powder form and binder).

The solid element A has a composite shape with a cylindrical body 1a, the diameter of which is smaller than the tap hole, so that the fixed member is inserted into the tap hole can be introduced. The body 1a expands at its end directed towards the interior of the converter to form one cylindrical head 1b, the base area of which has a larger diameter than the tapping hole (FIG. 1).

The solid element A can also have a more complicated shape with two Have cylindrical sections, namely with the body 1a and the head 1b, which via a frustoconical element 1d are connected (Figure 2).

The ring packing 1c can be prefabricated independently of the fixed element A, or it can also be poured onto it directly the solid element can be molded. In the latter case one uses a sleeve element 1e, which the cylindrical Surrounds head 1b. That part of the sleeve element 1e, which by a certain amount against that with the smaller cross-section provided end of the fixed element A protrudes, ensures that the material forming the pack before the insertion of the

Plug cannot flow out.

In both cases, the sleeve element 1e can exert its interception effect, even while the plug is being inserted, with it prevents any possibility of radial outflow of the material making up the packing.

As mentioned, the sleeve element made of sheet metal or any other plastically deformable material exist. The packing is made of a mixture of heat-resistant material and a binder in suitable proportions.

The following compositions, given in percent by weight, have proven to be particularly advantageous in the preparation of the mixture highlighted:

Weight%

ManQesit, grain size ^ = 3mm 75 -

iech

■ Powdered toilet 0-12

Tar 2-10

A particularly advantageous composition consists of the following proportions, also given in percent by weight:

Weight%

Magnesite, kangaroo size ■ < 1 mm 52.18

Magnesite, grain size> r 1 mm < 2 mm 21.74

Magnesite, grain size ^ z. 2 ram <3 mm 04/13

Dry pitch in powder form 9.13

Tar 3.91

It should be emphasized that the improvement achieved according to the invention offers the possibility of using the entire device for plugging the tapping hole also on stationary converters. In For example, converters in which iron or steel is produced by inflating oxygen come into question.

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Indeed, similar to rotating and / or oscillating converters, even with such stationary converters, spray liquid materials through the tap hole or flow out, due to the fact that the slag is emulsified that stirring effects occur or that others unforeseeable reasons arise. The exit of the liquid Materials from the tap hole are even possible if the tap hole is a considerable distance above the bath. The following disadvantages then result

- Loss of metal and / or slag j

- severe signs of wear and tear on the tap hole wall forming heat-resistant material »by the chemical etching effect of the slag; and

- the risk of clogging, even if only partially Clogging of the tap hole due to the solidification of the material that has flowed into the tap hole.

The improved plug of the invention is particularly useful for this suitable to solve these problems also in the case of a stationary converter. Indeed, the setting or curing of the takes care of the Packing-forming connecting material in each case that an additional adhesive effect of the plug occurs at the tapping hole. This is necessary in order to avoid the effects of a possible breakage of the elements locking the plug avoid. If, as described in the main patent, it is a rotating and / or oscillating converter, this is additional adhesive effect brought about in another way, namely by the centrifugal force occurring.

40980b / 0

Claims (5)

2337958 claims 1. Device for plugging the tapping hole of converters for metallurgical processes with a plug that protrudes from the inside of the converter into the tap hole and is braced to the outside by a holding member, according to patent 2 217 726, marked by a solid element (a) made of refractory material, which turns into a substantially cylindrical, larger than that Tapping hole formed head (1b) expanded, and by a ring packing (B; 1c), the material of which consists essentially of a Mixture consists of refractory material in powder form with a binder and in the cold state coherent and when is plastically deformable within the thermal interval for setting the mixture as the temperature increases as well as becomes non-deformable at such temperatures, the higher than the thermal setting interval, but lower than the operating temperature of the converter, namely after an exposure to the operating conditions that is longer than the time required to install the plug, 2. Device according to claim 1,
characterized, that the fixed element (A) has a cylindrical body (1a) which is smaller in diameter than the tapping hole, which optionally expands into the head (1b) with the interposition of a truncated cone-shaped element (ld). 3. Device according to claim 1 or 2,
characterized, that the ^ ingoackung (B; 1c) 'following composition in Λ bil.ion'je Materiel Has weight percent: Magnesite, grain size - £ ~ 3mm 75 - dry pitch in powder form 0-12, Tar 2-10 4. Device according to one of claims 1 to 3, characterized, that the ring packing (B; 1c) independent of the heat-resistant Material existing solid element (A) is made. 5. Device according to one of claims 1 to 4, characterized in that that the head (1b) of the fixed element (A) along its Side surface with a sleeve element (le) made of sheet metal or other plastically deformable material is provided, doe's protrudes towards the smaller diameter end of the solid body (a).