CA2082836C - Process and device to avoid contamination of tapping steel by flush slag with a tiltable converter - Google Patents
Process and device to avoid contamination of tapping steel by flush slag with a tiltable converter Download PDFInfo
- Publication number
- CA2082836C CA2082836C CA 2082836 CA2082836A CA2082836C CA 2082836 C CA2082836 C CA 2082836C CA 2082836 CA2082836 CA 2082836 CA 2082836 A CA2082836 A CA 2082836A CA 2082836 C CA2082836 C CA 2082836C
- Authority
- CA
- Canada
- Prior art keywords
- converter
- stopper
- funnel
- wall
- tapping channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000010959 steel Substances 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 title claims abstract description 13
- 238000010079 rubber tapping Methods 0.000 title abstract description 41
- 239000002893 slag Substances 0.000 title abstract description 22
- 238000011109 contamination Methods 0.000 title abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 239000004033 plastic Substances 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 14
- 239000004014 plasticizer Substances 0.000 claims description 8
- 239000004927 clay Substances 0.000 claims description 6
- 150000004760 silicates Chemical class 0.000 claims description 6
- 210000000078 claw Anatomy 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 150000001298 alcohols Chemical class 0.000 claims description 4
- 229920002678 cellulose Polymers 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 239000000194 fatty acid Substances 0.000 claims description 4
- 229930195729 fatty acid Natural products 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- 239000002480 mineral oil Substances 0.000 claims description 4
- 235000010446 mineral oil Nutrition 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 239000003779 heat-resistant material Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 229920000867 polyelectrolyte Polymers 0.000 claims description 3
- -1 e.g. Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 230000001419 dependent effect Effects 0.000 abstract 1
- 230000001627 detrimental effect Effects 0.000 abstract 1
- 230000009970 fire resistant effect Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 235000010980 cellulose Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000010210 aluminium Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 235000012245 magnesium oxide Nutrition 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000012243 magnesium silicates Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical class [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4653—Tapholes; Opening or plugging thereof
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
This invention concerns a process for the reliable avoidance of slag contamination of the converter tapping steel by flush slag. In accordance with the invention a plastic, workable stopper made of fire-proof material containing silicic and oxidic components as well as suitable binding agents is used for this purpose. The stopper is introduced so far into the tapping channel with the help of a setting device that its front surface, terminated with a funnel-shaped compression plate, almost aligns flushly with the interior side of the converter, and it fills in the diameter of the tapping channel as a result of being compressed, creating such a plane treat the flush slag occurring during tipping of the converter is reliably directed past the tapping channel. Stopper systems used up to now had the disadvantage that age-dependent enlargements of the tapping channel had a detrimental effect on the functioning of the stopper. The new plastic stopper adapts to a large range of tapping channel diameters in accordance with the process used.
Description
Process and Device to Avoid Contamination of Ta~ping Steel by Flush Slag with a Tiltable Converter Description This invention concerns a process and a device to avoid, or rather prevent, contamination of tapping steel by flush slag with tiltable converters.
Tiltable converters have a discharge opening located at a suitable spot in the converter wall above the bath level through which liquid steel is transferred into the tap ladle. In order to empty the converter, it is tipped into such a position that the steel flows through the discharge opening into the ladle. Since specifically lighter slag of various viscosities is always found on the molten metal, it first passes into the tap hole during the tilting process and thus varying quantities of flush slag end up in the tap ladle. The presence of oxygen-rich slag, frequently enriched with phosphorous or sulphur, is dis-advantageous for numerous subsequent metallurgical pro-cesses. This results in the demand that converter steel be transferred to the tap ladle as free of slag as possible.
This is preferably achieved by plugging the tap opening of the converter temporarily.
Tiltable converters have a discharge opening located at a suitable spot in the converter wall above the bath level through which liquid steel is transferred into the tap ladle. In order to empty the converter, it is tipped into such a position that the steel flows through the discharge opening into the ladle. Since specifically lighter slag of various viscosities is always found on the molten metal, it first passes into the tap hole during the tilting process and thus varying quantities of flush slag end up in the tap ladle. The presence of oxygen-rich slag, frequently enriched with phosphorous or sulphur, is dis-advantageous for numerous subsequent metallurgical pro-cesses. This results in the demand that converter steel be transferred to the tap ladle as free of slag as possible.
This is preferably achieved by plugging the tap opening of the converter temporarily.
In this regard, a number of systems are known which are supposed to open the tapping channel only when the slag has passed the tapping channel during the tipping process. In particular, slide systems are known as closing mechanisms; but they cannot prevent flush slag entering the tapping channel. In addition, up to now stoppers made of various materials or combinations of materials have been placed outside in the tap opening or driven into it.
Combinations of fibrous materials with solid bodies, plastic clay materials, wooden stoppers, and also pitch stoppers are used for the external placement and, for the internal placement, combinations of sheet metals coated with fireproof materials and sheet metal claws which are supposed to dig into the tapping channel as described in DE 39 38 687 C2.
The technically required conical or funnel-like shape of the tapping channel and the progressive wear of the fire-proof material in this area results in the premature breakdown of the stopper protection against flush slag contaminants, so that the behaviour of the stoppers cannot be controlled and, therefore, they are a negative factor.
Consequently, fairly large quantities of flush slag are frequently transferred into the ladle.
The problem of this invention is to present a flush slag stopper and a process which reliably prevents large quantities of converter flush slag from being transferred into the ladle.
208283fi This problem is solved by using a suitable setting device to push a highly plastic, fire-resistant material into the tapping channel from the outside up to the area of transition to the inside of the converter and com-pressing it with the help of the setting device and a compressing plate made of heat-resistant materials attached to the stopper to such an extent that the diam-eter of the tapping pipe is completely filled in.
As a result of this working method, the geometric shape of the tapping channel, especially age-related tapping channel enlargements, are of secondary importance to the functioning of the stopper.
In the inventive application, the stopper, which conforms in its fire-proof composition and plasticity to the occurring operating conditions, adheres instantaneous-ly to the tapping channel wall, so that immediately after placement the stopper sits firmly in the tapping channel directly in the area of transition to the interior of the converter. On account of the high interior temperatures in 2o the converter, within a short time the fire-proof material forms a sintered cap a few centimetres thick on the side facing the interior of the converter which can bear the blast pressure and the occurring vibration and shaking. In particular, the time at which the stopper is placed in the tapping channel in accordance with the invention in order to exercise its protective function is of secondary importance. Even after the flush stopper has been in the tapping pipe for several hours, the different operating processes and conditions of a converter have no negative ~~~2~3~
Combinations of fibrous materials with solid bodies, plastic clay materials, wooden stoppers, and also pitch stoppers are used for the external placement and, for the internal placement, combinations of sheet metals coated with fireproof materials and sheet metal claws which are supposed to dig into the tapping channel as described in DE 39 38 687 C2.
The technically required conical or funnel-like shape of the tapping channel and the progressive wear of the fire-proof material in this area results in the premature breakdown of the stopper protection against flush slag contaminants, so that the behaviour of the stoppers cannot be controlled and, therefore, they are a negative factor.
Consequently, fairly large quantities of flush slag are frequently transferred into the ladle.
The problem of this invention is to present a flush slag stopper and a process which reliably prevents large quantities of converter flush slag from being transferred into the ladle.
208283fi This problem is solved by using a suitable setting device to push a highly plastic, fire-resistant material into the tapping channel from the outside up to the area of transition to the inside of the converter and com-pressing it with the help of the setting device and a compressing plate made of heat-resistant materials attached to the stopper to such an extent that the diam-eter of the tapping pipe is completely filled in.
As a result of this working method, the geometric shape of the tapping channel, especially age-related tapping channel enlargements, are of secondary importance to the functioning of the stopper.
In the inventive application, the stopper, which conforms in its fire-proof composition and plasticity to the occurring operating conditions, adheres instantaneous-ly to the tapping channel wall, so that immediately after placement the stopper sits firmly in the tapping channel directly in the area of transition to the interior of the converter. On account of the high interior temperatures in 2o the converter, within a short time the fire-proof material forms a sintered cap a few centimetres thick on the side facing the interior of the converter which can bear the blast pressure and the occurring vibration and shaking. In particular, the time at which the stopper is placed in the tapping channel in accordance with the invention in order to exercise its protective function is of secondary importance. Even after the flush stopper has been in the tapping pipe for several hours, the different operating processes and conditions of a converter have no negative ~~~2~3~
effect whatsoever on its full functioning and protective effect. Due to its placement in the area of transition to the interior of the converter, the penetration of slag into the tapping channel during the blast process, which occurs frequently with newly lined converters, is also effectively prevented. In addition, the permanent and temporary binding agents contained in the f ire-proof material of the flush stopper prevent the rest of the mass decomposing prematurely.
The cap formed towards the interior side of the con-verter is stable enough to direct the slag securely past the tapping channel when the converter is tipped. It col-lapses only when exposed to the ferrostatic pressure.
Because the material adjacent to the tapping channel wall is not sintered, it is completely removed within a short time by the outflowing steel.
The fact that large masses of fire-proof material is a disadvantage of other stopper systems as mentioned in DE
39 38 687 C2 is not supported by the inventive fire-proof 2o material mentioned. For the inventive process mentioned, merely a mass of ca. 2 - 3 kg fire-proof material is required to provide complete protection, even with conical tapping pipes larger than 20 cm in diameter.
The fire-proof material may be made of raw materials based on suitable compositions of silicon, aluminium, and magnesium oxides or silicates. Insulating alumosilicate or magnesium silicate as well as quartz materials in a grain size less than 3 mm are preferred.
20~2~36 In a preferred embodiment of the invention, the f ire-resistant material should have the following composition:
- alumosilicate, insulating 20 - 40~ by weight - bonding clay 20 - 40~ by weight - water 0 - 30~ by weight - mineral oil 5 - 20~ by weight - plasticizer 0.1 - 0.5~ by weight - liquifier 0.1 - 0.5~ by weight - temporary binders/celluloses 0.1 - 0.5~ by weight - permanent binders/silicates 1 - 2.5~ by weight.
This fire-resistant material has a density by volume of 0.8 - 0.9 kg/dm3 and, therefore, is considerably lighter than the materials traditionally used for this purpose.
The compression plate used is made of heat-resistant material and may have any geometric shape suitable for this purpose. In a preferred embodiment of the invention, it is funnel-like in shape and has a funnel channel extend-ed through the stopper. Among other things, this channel serves as a guide for the setting tool to compress the stopper and to centre the exiting stream of molten metal at the moment of the tapping ~in order to avoid the shower effect of the flowing steel. The funnel channel can have various diameters. In the case of the inventive embodiment used, the diameters are 25 - 38 mm; they may, however, also be larger or smaller, and the entire funnel channel may be conical. The cross-section of the funnel channel may deviate from the circular shape.
(a) In one broad aspect, the present invention relates to a device for sealing the taphole of a tiltable converter with a sealing plug (8) which is made of a heat-resistant 5 material, a faceplate (2) directed towards the inside of the converter (9) which melts on contact with liquid steel and a jigging device by which the sealing plug (8) can be inserted into the taphole (10) and can be moulded therein against its wall, whereby the sealing plug (8) comprises a cylindrical, plastic core (1) covered by a faceplate (2) and a base plate (4) which are connected with the jigging device displaceably towards one another, characterised in that the faceplate (2) is designed passing into a funnel channel (5) which penetrates the sealing plug or core (1) and is designed to receive a drawing claw (6) acting on the faceplate.
In another broad aspect, the present invention relates to a process for operating a converter and for the even and slag-free removal of the liquid steel, whereby a sealing plug made of plastic is inserted into the taphole connecting the inner wall and outer wall up to the height of the inner wall of the converter in the taphole and is then moulded by means of a jigging device from its side averted from the inner wall and also from its side facing the inner wall until it fits tightly against the hole wall, the sealing plug is positioned by means of the jigging device in the transition zone in relation to the converter inner chamber opening a funnel channel passing therethrough by squeezing, whereby the plastic material of the plug is made of 20 to 40 wt % insulating aluminosilicate 20 to 40 wt % binding clay 0 to 30 wt % water 5 to 20 wt % mineral oil 0.1 to 3 wt o plasticizer, e.g., polyelectrolyte alcohols A
(b) 0.1 to 2 wt % liquefier, e.g., fatty acid 0.1 to 2 wt % temporary binding agent, e.g., cellulose and 5 0.1 to 5 wt % permanent binding agent, e.g., silicates is mixed to form a fire-retardant with a density of 0.8 to 0.9 kg/dm3, formed into a cylindrical body and is then penetrated by the funnel channel of a funnel-shaped squeezer plate, fitted onto the jigging device, inserted into the t....,~.,~., .. "~.~ ~,.,.."~.."a A:
The cap formed towards the interior side of the con-verter is stable enough to direct the slag securely past the tapping channel when the converter is tipped. It col-lapses only when exposed to the ferrostatic pressure.
Because the material adjacent to the tapping channel wall is not sintered, it is completely removed within a short time by the outflowing steel.
The fact that large masses of fire-proof material is a disadvantage of other stopper systems as mentioned in DE
39 38 687 C2 is not supported by the inventive fire-proof 2o material mentioned. For the inventive process mentioned, merely a mass of ca. 2 - 3 kg fire-proof material is required to provide complete protection, even with conical tapping pipes larger than 20 cm in diameter.
The fire-proof material may be made of raw materials based on suitable compositions of silicon, aluminium, and magnesium oxides or silicates. Insulating alumosilicate or magnesium silicate as well as quartz materials in a grain size less than 3 mm are preferred.
20~2~36 In a preferred embodiment of the invention, the f ire-resistant material should have the following composition:
- alumosilicate, insulating 20 - 40~ by weight - bonding clay 20 - 40~ by weight - water 0 - 30~ by weight - mineral oil 5 - 20~ by weight - plasticizer 0.1 - 0.5~ by weight - liquifier 0.1 - 0.5~ by weight - temporary binders/celluloses 0.1 - 0.5~ by weight - permanent binders/silicates 1 - 2.5~ by weight.
This fire-resistant material has a density by volume of 0.8 - 0.9 kg/dm3 and, therefore, is considerably lighter than the materials traditionally used for this purpose.
The compression plate used is made of heat-resistant material and may have any geometric shape suitable for this purpose. In a preferred embodiment of the invention, it is funnel-like in shape and has a funnel channel extend-ed through the stopper. Among other things, this channel serves as a guide for the setting tool to compress the stopper and to centre the exiting stream of molten metal at the moment of the tapping ~in order to avoid the shower effect of the flowing steel. The funnel channel can have various diameters. In the case of the inventive embodiment used, the diameters are 25 - 38 mm; they may, however, also be larger or smaller, and the entire funnel channel may be conical. The cross-section of the funnel channel may deviate from the circular shape.
(a) In one broad aspect, the present invention relates to a device for sealing the taphole of a tiltable converter with a sealing plug (8) which is made of a heat-resistant 5 material, a faceplate (2) directed towards the inside of the converter (9) which melts on contact with liquid steel and a jigging device by which the sealing plug (8) can be inserted into the taphole (10) and can be moulded therein against its wall, whereby the sealing plug (8) comprises a cylindrical, plastic core (1) covered by a faceplate (2) and a base plate (4) which are connected with the jigging device displaceably towards one another, characterised in that the faceplate (2) is designed passing into a funnel channel (5) which penetrates the sealing plug or core (1) and is designed to receive a drawing claw (6) acting on the faceplate.
In another broad aspect, the present invention relates to a process for operating a converter and for the even and slag-free removal of the liquid steel, whereby a sealing plug made of plastic is inserted into the taphole connecting the inner wall and outer wall up to the height of the inner wall of the converter in the taphole and is then moulded by means of a jigging device from its side averted from the inner wall and also from its side facing the inner wall until it fits tightly against the hole wall, the sealing plug is positioned by means of the jigging device in the transition zone in relation to the converter inner chamber opening a funnel channel passing therethrough by squeezing, whereby the plastic material of the plug is made of 20 to 40 wt % insulating aluminosilicate 20 to 40 wt % binding clay 0 to 30 wt % water 5 to 20 wt % mineral oil 0.1 to 3 wt o plasticizer, e.g., polyelectrolyte alcohols A
(b) 0.1 to 2 wt % liquefier, e.g., fatty acid 0.1 to 2 wt % temporary binding agent, e.g., cellulose and 5 0.1 to 5 wt % permanent binding agent, e.g., silicates is mixed to form a fire-retardant with a density of 0.8 to 0.9 kg/dm3, formed into a cylindrical body and is then penetrated by the funnel channel of a funnel-shaped squeezer plate, fitted onto the jigging device, inserted into the t....,~.,~., .. "~.~ ~,.,.."~.."a A:
A preferred embodiment of the invention is explained below, the diagrammatic illustrations being as follows:
Fig. 1 a lateral perspective view of an embodiment through a slag flush stopper, Fig 2 a section through an object in accordance with Fig.
1 and positioning in the tapping channel of a converter, Fig. 3 a section though a configuration following the insertion and compressing of the object in accordance with Fig. 1.
to The flush stopper illustrated in Fig. 1 is cylindrical in shape. The cross-section of the stopper need not be circular in shape.
The stopper 1 is made of a fire-resistant material and has a funnel-shaped compression plate 2 on the side towards the interior of the converter, this plate having an extended funnel channel 5 which leads through the stopper 1. In the embodiment illustrated the fire-resis-tant material of the stopper is composed of the following:
alumosilicate, insulating 35~ by weight 2o bonding clay 35~ by weight water 20~ by weight mineral oil 6.5~ by weight plasticizer 0.2~ by weight liquifier 0.3~ by weight temporary binders 0.5~ by weight permanent binders 2.5~ by weight.
2Q~2~3~
Silicates were used as permanent binders, cellulose materials as temporary binders, polyelectrolytical alco-hols and fatty acids as plasticizers and liquifiers. The specific gravity of the stopper is 0.8 - 0.9 Kg/dm3.
Fig. 2 illustrates how the stopper is inserted into the tapping channel with the help of the setting device.
The base plate 4 of the setting device, which conforms to the diameter of the tapping channel, is adjacent to the opposite side 7 of the compression plate.
A pulling claw 6 is introduced through the funnel channel 5 to a position above the funnel and holds the stopper for the time being until it is finally positioned in the tapping channel. The stopper is introduced so far into the tapping channel with the help of the setting device that its compression plate surface almost aligns flush with the interior side of the converter 9. The lever system of the setting device is used to draw the pulling claw 6 to the compression plate 2, producing pressure on the stopper material 1, which deforms until the diameter of the tapping hole 10 is completely filled in. Fig. 3 illustrates a compressed stopper 8 in the tapping channel 10. With the help of the setting device the thickness of the stopper base 12 in Fig. 3 is always adhered to for every tapping channel diameter of a converter, so that it is guaranteed that the behaviour of the opening is repro-ducible. Stopper material not required to f ill in the tapping channel diameter is compressed to the tapping channel wall with the help of the compression plate as shown in Fig. 3.
20~~~~~
g On account of the high radiant heat on the interior side of the converter, the compression plate melts and sinters with the f ire-proof material to a solid cap 11, Fig 3. This cap bears the blast pressure and the resulting vibration and shaking. The remaining fire-proof insulating material solidifies to such an extent that it remains stable in the tapping channel. It does not sinter with the wall of the tapping channel. The sintered cap is so stable that it directs the flush slag reliably over the tapping hole when the converter is tipped and only collapses under the ferrostatic pressure. The remaining stopper material is removed within a few seconds by the outflowing steel.
On account of the low material quantities, only a few foreign substances reach the tapping ladle. The inventive embodiment and application guarantee a high degree of reliability in the functioning of the flush stopper, even where it is exposed to heat for periods longer than two hours. Where stationary slag measurements were carried out in tapping ladles of 100 - 250 t capacity, significant quantities of flush slag could no longer be detected in 200 test relinings.
Fig. 1 a lateral perspective view of an embodiment through a slag flush stopper, Fig 2 a section through an object in accordance with Fig.
1 and positioning in the tapping channel of a converter, Fig. 3 a section though a configuration following the insertion and compressing of the object in accordance with Fig. 1.
to The flush stopper illustrated in Fig. 1 is cylindrical in shape. The cross-section of the stopper need not be circular in shape.
The stopper 1 is made of a fire-resistant material and has a funnel-shaped compression plate 2 on the side towards the interior of the converter, this plate having an extended funnel channel 5 which leads through the stopper 1. In the embodiment illustrated the fire-resis-tant material of the stopper is composed of the following:
alumosilicate, insulating 35~ by weight 2o bonding clay 35~ by weight water 20~ by weight mineral oil 6.5~ by weight plasticizer 0.2~ by weight liquifier 0.3~ by weight temporary binders 0.5~ by weight permanent binders 2.5~ by weight.
2Q~2~3~
Silicates were used as permanent binders, cellulose materials as temporary binders, polyelectrolytical alco-hols and fatty acids as plasticizers and liquifiers. The specific gravity of the stopper is 0.8 - 0.9 Kg/dm3.
Fig. 2 illustrates how the stopper is inserted into the tapping channel with the help of the setting device.
The base plate 4 of the setting device, which conforms to the diameter of the tapping channel, is adjacent to the opposite side 7 of the compression plate.
A pulling claw 6 is introduced through the funnel channel 5 to a position above the funnel and holds the stopper for the time being until it is finally positioned in the tapping channel. The stopper is introduced so far into the tapping channel with the help of the setting device that its compression plate surface almost aligns flush with the interior side of the converter 9. The lever system of the setting device is used to draw the pulling claw 6 to the compression plate 2, producing pressure on the stopper material 1, which deforms until the diameter of the tapping hole 10 is completely filled in. Fig. 3 illustrates a compressed stopper 8 in the tapping channel 10. With the help of the setting device the thickness of the stopper base 12 in Fig. 3 is always adhered to for every tapping channel diameter of a converter, so that it is guaranteed that the behaviour of the opening is repro-ducible. Stopper material not required to f ill in the tapping channel diameter is compressed to the tapping channel wall with the help of the compression plate as shown in Fig. 3.
20~~~~~
g On account of the high radiant heat on the interior side of the converter, the compression plate melts and sinters with the f ire-proof material to a solid cap 11, Fig 3. This cap bears the blast pressure and the resulting vibration and shaking. The remaining fire-proof insulating material solidifies to such an extent that it remains stable in the tapping channel. It does not sinter with the wall of the tapping channel. The sintered cap is so stable that it directs the flush slag reliably over the tapping hole when the converter is tipped and only collapses under the ferrostatic pressure. The remaining stopper material is removed within a few seconds by the outflowing steel.
On account of the low material quantities, only a few foreign substances reach the tapping ladle. The inventive embodiment and application guarantee a high degree of reliability in the functioning of the flush stopper, even where it is exposed to heat for periods longer than two hours. Where stationary slag measurements were carried out in tapping ladles of 100 - 250 t capacity, significant quantities of flush slag could no longer be detected in 200 test relinings.
Claims (8)
1. Device for sealing the taphole of a tiltable converter with a sealing plug (8) which is made of a heat-resistant material, a faceplate (2) directed towards the inside of the converter (9) which melts on contact with liquid steel and a jigging device by which the sealing plug (8) can be inserted into the taphole (10) and can be moulded therein against its wall, whereby the sealing plug (8) comprises a cylindrical, plastic core (1) covered by a faceplate (2) and a base plate (4) which are connected with the jigging device displaceably towards one another, characterised in that the faceplate (2) is designed passing into a funnel channel (5) which penetrates the sealing plug or core (1) and is designed to receive a drawing claw (6) acting on the faceplate.
2. Device according to claim 1, characterised in that the cylindrical core (1) is made of a fire-retardant with a grain size of below 3mm, binding agents, liquefiers and plasticizers.
3. Device according to claim 2, characterised in that the cylindrical core (1) comprises as a fire retardant mixture of 20 to 40 wt % aluminosilicate 20 to 40 wt % bonding clay and 0 to 30 wt % water to 20 wt % oil 0.5 to 3 wt % plasticizer 0.1 to 2 wt % liquefier 0.1 to 2 wt % temporary binding agent 0.1 to 5 wt % permanent binding agent and has a density of 0.8 - 0.9 kg/dm3.
4. Device according to claim 3, characterised in that the permanent binding agents are silicates, the temporary binding agents - cellulose-material, the plasticizers - polyelectrolyte alcohols and the liquefiers fatty acids.
5. Device according to claim 1, characterised in that the faceplate (2) is funnel-shaped and convex towards the smaller opening and the smaller opening is designed to exit into the funnel channel (5).
6. Device according to claim 5, characterised in that the funnel channel (5) is designed passing over the baseplate (4) and into the jigging device.
7. Device according to claim 1, characterised in that the funnel channel (5) with a taphole diameter of 20 cm has a diameter of 25 to 38 mm.
8. Process for operating a converter and for the even and slag-free removal of the liquid steel, whereby a sealing plug made of plastic is inserted into the taphole connecting the inner wall and outer wall up to the height of the inner wall of the converter in the taphole and is then moulded by means of a jigging device from its side averted from the inner wall and also from its side facing the inner wall until it fits tightly against the hole wall, the sealing plug is positioned by means of the jigging device in the transition zone in relation to the converter inner chamber opening a funnel channel passing therethrough by squeezing, whereby the plastic material of the plug is made of 20 to 40 wt % insulating aluminosilicate 20 to 40 wt % binding clay 0 to 30 wt % water to 20 wt % mineral oil 0.1 to 3 wt % plasticizer, e.g., polyelectrolyte alcohols 0.1 to 2 wt % liquefier, e.g., fatty acid 0.1 to 2 wt % temporary binding agent, e.g., cellulose and 0.1 to 5 wt % permanent binding agent, e.g., silicates is mixed to form a fire-retardant with a density of 0.8 to 0.9 kg/dm3, formed into a cylindrical body and is then penetrated by the funnel channel of a funnel-shaped squeezer plate, fitted onto the jigging device, inserted into the taphole and secured.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4211593.0 | 1992-04-07 | ||
| DE19924211593 DE4211593C2 (en) | 1992-04-07 | 1992-04-07 | Device for closing the tapping hole of a tiltable converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2082836A1 CA2082836A1 (en) | 1993-10-08 |
| CA2082836C true CA2082836C (en) | 2000-07-18 |
Family
ID=6456255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2082836 Expired - Fee Related CA2082836C (en) | 1992-04-07 | 1992-11-13 | Process and device to avoid contamination of tapping steel by flush slag with a tiltable converter |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2082836C (en) |
| DE (2) | DE4211593C2 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT257665B (en) * | 1964-08-03 | 1967-10-25 | Voest Ag | Device for closing the tap in inflatable crucibles or other metallurgical furnaces |
| DE2549728C2 (en) * | 1975-11-06 | 1977-10-06 | Stahlwerke Peine-Salzgitter Ag, 3150 Peine | Device for closing the tapping hole of a converter |
| US4399986A (en) * | 1981-12-14 | 1983-08-23 | Collins William J | Device for plugging a taphole in a furnace |
| NL8602255A (en) * | 1986-09-08 | 1988-04-05 | Hoogovens Groep Bv | STOP FOR A CONVERTER TAP HOLE. |
| US4828226A (en) * | 1987-10-16 | 1989-05-09 | Foseco International Limited | Tap hole plugs for metallurgical vessels |
| AU625800B2 (en) * | 1988-12-01 | 1992-07-16 | Goricon Metallurgical Services Limited | Improvements relating to steel-making vessels |
| US4877221A (en) * | 1988-12-05 | 1989-10-31 | Tri-Star Manufacturing & Service, Inc. | Expandable tap hole plug |
-
1992
- 1992-04-07 DE DE19924211593 patent/DE4211593C2/en not_active Expired - Lifetime
- 1992-11-13 CA CA 2082836 patent/CA2082836C/en not_active Expired - Fee Related
- 1992-11-17 DE DE9215646U patent/DE9215646U1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4211593C2 (en) | 1994-08-11 |
| DE9215646U1 (en) | 1993-08-19 |
| CA2082836A1 (en) | 1993-10-08 |
| DE4211593A1 (en) | 1993-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FI75866B (en) | ANORDNING FOER TILLSAETTNING AV AEMNEN TILL EN VAETSKA. | |
| US3091119A (en) | Temperature measuring apparatus | |
| MXPA00012305A (en) | Method and device for sealing a tap hole in metallurgical containers. | |
| US5972281A (en) | Process and device to avoid contamination of tapping steel by flush slag with a tiltable converter | |
| EP0260735B1 (en) | Stopper for a tap hole of a steel converter and method of operating a converter | |
| EP0105868B1 (en) | Metallurgical furnace or metallurgical vessel | |
| CA2082836C (en) | Process and device to avoid contamination of tapping steel by flush slag with a tiltable converter | |
| US4632367A (en) | Device for introducing gas into molten metal | |
| AU671447B2 (en) | Process and device for preventing contamination of the tapping steel by flush slag in a tipping converter | |
| JPS62501859A (en) | Device for introducing treatment substances into liquids | |
| FI56857C (en) | SAFETY OVER ANORDNING FOR REFINING AVAILABLE WITH POWDER FORMATION FAST MATERIAL OCH / ELLER GAS | |
| GB2344159A (en) | Deformable tap hole sealing plug for a tiltable converter | |
| US4913314A (en) | Opening element for an insert nozzle of a slide gate valve apparatus and a method of opening said apparatus | |
| SU1118690A1 (en) | Method of steel teeming from converter and device for effecting same | |
| GB2534231B (en) | Slag shield | |
| KR0135026B1 (en) | Device for preventing contamination of the tapping steel by flush slag in a tipping converter | |
| UA125972C2 (en) | Plug for converter flaps | |
| KR20000074948A (en) | A tool for preventing outflow of a slag | |
| KR19990000768A (en) | Slag outflow prevention device of converter | |
| JPH025502B2 (en) | ||
| JPS6159829B2 (en) | ||
| JPH0313790A (en) | Repair method of tapping-hole nozzle receiving brick of molten metal vessel and fitting for repair thereof | |
| GB2179724A (en) | Device for introducing gas into molten metal | |
| DE9213704U1 (en) | Converter with plastic slag flow plug | |
| JPH09502013A (en) | Permanent device and its use for emptying the discharge conduit of metallurgical equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |