CA2274009C - Procede et installation pour le traitement de l'acier en poche - Google Patents
Procede et installation pour le traitement de l'acier en poche Download PDFInfo
- Publication number
- CA2274009C CA2274009C CA002274009A CA2274009A CA2274009C CA 2274009 C CA2274009 C CA 2274009C CA 002274009 A CA002274009 A CA 002274009A CA 2274009 A CA2274009 A CA 2274009A CA 2274009 C CA2274009 C CA 2274009C
- Authority
- CA
- Canada
- Prior art keywords
- bell
- molten metal
- treatment
- ladle
- steel
- 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
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000009434 installation Methods 0.000 title abstract description 7
- 229910000831 Steel Inorganic materials 0.000 title description 16
- 239000010959 steel Substances 0.000 title description 16
- 239000002184 metal Substances 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 28
- 230000005587 bubbling Effects 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 3
- 239000011261 inert gas Substances 0.000 claims 1
- 229910001338 liquidmetal Inorganic materials 0.000 abstract 2
- 239000002893 slag Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009850 CAS-OB (composition adjustment by sealed argon bubbling with oxygen blowing) Methods 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004901 spalling Methods 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/0025—Charging or loading melting furnaces with material in the solid state
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
- Coating With Molten Metal (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention concerns a method and an installation for minimising the local wear of a bell during a ladle treatment of a liquid metal by rotating the bell about an axi s during the treatment of the liquid metal.
Description
METHOD AND INSTALLATION FOR LADLE TREATMENT OF STEEL
The present invention relates to a method and an installation for the treatment of molten metal, particularly of steel in a ladle.
At present, a series of methods exists for the treatment of molten metal, particularly of steel in the ladle, according to which a bell or a tube is plunged into the molten metal contained in a ladle. Such methods of treatment include, inter alfa, those known as CAS, CAS-OB, HALT, etc.
In this type of method, the molten metal contained in the ladle is subjected to different treatments in a confined zone, defined by the bell plunging into the molten metal. A bubbling gas is injected under the bell into the molten metal in order to homogenise it during the treatment. Turbulence then occurs at the surface of the molten metal which leads to an increased local wear of the bell over its lower edge.
The objective of the present invention is to propose a method and a device making it possible to minimise the local wear of the bell during the treatment of molten metal in a ladle.
This objective is attained by a method aiming to minimise the local wear of a bell during a treatment of a molten metal in a ladle, characterised in that the bell is rotated about an axis during the treatment of the molten metal.
The fact that the bell is given a rotational movement enables the local wear of the bell to be minimised. In effect, since the bell rotates during the treatment of the molten metal, increased wear at a given place due to turbulence in the molten metal is no longer a source of concern.
The bell is in fact worn uniformly over the whole of its perimeter.
Since these bells are costly and since the replacement of worn bells takes a certain amount of tune, the present method also enables the running costs of the installation to be reduced.
Such a method is particularly useful when implementing the method for the treatment of molten steel in a ladle described in the European patent EP 0 110 809. In such a method, by which the steel contained in the ladle is heated by the aluminothermie process and by which a
The present invention relates to a method and an installation for the treatment of molten metal, particularly of steel in a ladle.
At present, a series of methods exists for the treatment of molten metal, particularly of steel in the ladle, according to which a bell or a tube is plunged into the molten metal contained in a ladle. Such methods of treatment include, inter alfa, those known as CAS, CAS-OB, HALT, etc.
In this type of method, the molten metal contained in the ladle is subjected to different treatments in a confined zone, defined by the bell plunging into the molten metal. A bubbling gas is injected under the bell into the molten metal in order to homogenise it during the treatment. Turbulence then occurs at the surface of the molten metal which leads to an increased local wear of the bell over its lower edge.
The objective of the present invention is to propose a method and a device making it possible to minimise the local wear of the bell during the treatment of molten metal in a ladle.
This objective is attained by a method aiming to minimise the local wear of a bell during a treatment of a molten metal in a ladle, characterised in that the bell is rotated about an axis during the treatment of the molten metal.
The fact that the bell is given a rotational movement enables the local wear of the bell to be minimised. In effect, since the bell rotates during the treatment of the molten metal, increased wear at a given place due to turbulence in the molten metal is no longer a source of concern.
The bell is in fact worn uniformly over the whole of its perimeter.
Since these bells are costly and since the replacement of worn bells takes a certain amount of tune, the present method also enables the running costs of the installation to be reduced.
Such a method is particularly useful when implementing the method for the treatment of molten steel in a ladle described in the European patent EP 0 110 809. In such a method, by which the steel contained in the ladle is heated by the aluminothermie process and by which a
2 certain number of alloying elements are added to the steel, the bell is asymmetrically stressed:
on a "hot" side, the bell, or more precisely the refractory lining of the lower edge of the bell, is attacked by thermal shocks and by chemical corrosion produced by splashes of metal and slag. The wear is caused mainly by spalling of the refractory lining.
on the "cold" side, and possibly in intermittent usage when the refractory lining is I O cooled, the bell is "fattened" by solidification of splashes of metal and/or of slag.
These phenomena of local wear and "fattening" considerably reduce the working life of the bell and thus increase the costs of production by the method involving addition and heating under the bell. The proposed method prolongs the useful life of a refractory bell by minimising the local wear, by reducing the local "fattening" and even by compensating for local wear by a lining produced in situ.
According to a first advantageous mode of execution, the rotational speed of the bell lies between 0.5 and 2 revolutions per minute during the treatment of the molten metal. The rotational speed of the bell may be adapted as a function of the diameter of the bell, as a function of the treatment applied to the molten metal, and/or as a function of the composition and viscosity of the slag covering the molten metal in the ladle. Of course, the ladle may continue to rotate about its axis even when it is withdrawn from the bath alter the treatment of the molten metal.
According to another preferred mode of execution, the bell rotates about a vertical axis, roughly perpendicular to the surface of the molten metal or the molten steel.
According to another aspect of the present invention, an installation is also proposed for the implementation of the method, the said installation incorporating a driving device for driving the bell in a rotational movement during the treatment of the molten metal.
on a "hot" side, the bell, or more precisely the refractory lining of the lower edge of the bell, is attacked by thermal shocks and by chemical corrosion produced by splashes of metal and slag. The wear is caused mainly by spalling of the refractory lining.
on the "cold" side, and possibly in intermittent usage when the refractory lining is I O cooled, the bell is "fattened" by solidification of splashes of metal and/or of slag.
These phenomena of local wear and "fattening" considerably reduce the working life of the bell and thus increase the costs of production by the method involving addition and heating under the bell. The proposed method prolongs the useful life of a refractory bell by minimising the local wear, by reducing the local "fattening" and even by compensating for local wear by a lining produced in situ.
According to a first advantageous mode of execution, the rotational speed of the bell lies between 0.5 and 2 revolutions per minute during the treatment of the molten metal. The rotational speed of the bell may be adapted as a function of the diameter of the bell, as a function of the treatment applied to the molten metal, and/or as a function of the composition and viscosity of the slag covering the molten metal in the ladle. Of course, the ladle may continue to rotate about its axis even when it is withdrawn from the bath alter the treatment of the molten metal.
According to another preferred mode of execution, the bell rotates about a vertical axis, roughly perpendicular to the surface of the molten metal or the molten steel.
According to another aspect of the present invention, an installation is also proposed for the implementation of the method, the said installation incorporating a driving device for driving the bell in a rotational movement during the treatment of the molten metal.
3 BRIEF DESCRIPTION OF THE DRAWINGS
A preferred mode of execution of an installation according to the invention is described with the help of the appended drawings, in which:
FIG. 1 shows a transverse cross-section through a bell and a ladle filled with molten steel at S rest;
FIG. 2 shows a transverse cross-section through a bell and a ladle filled with molten steel in a working position; and FIG. 3 shows an enlargement of a device for driving the bell.
A ladle 10 having a refractory lining 15 is filled with molten steel 20 and is placed below a refractory bell 30. In the working position, during the treatment of the molten metal, the bell 30 is lowered until its lower edge 40 dips into the molten steel 20 (FIG. 2).
The bell 30 is connected to a feed pipe 50 through which the combustible materials and the alloying elements are introduced into the molten steel 20. It comprises a driving device 60 capable of driving the bell in a rotational movement about a vertical axis.
An inert or reducing bubbling gas may be introduced into the molten steel 20 either through a porous plug (not represented) positioned in the bottom of the ladle 10 or through a lance (not represented) which is introduced into the ladle 10. This bubbling gas is used to homogenise the molten steel 20 contained in the ladle 10 during the treatment of the steel 20. This bubbling gas creates turbulence at the surface of the steel 20 which causes a local wear of the bell 30, particularly of the lower edge 40 of the bell 30.
FIG. 3 shows an enlarged view of the device 60 for driving the bell 30. The upper end of the bell 30 carnes a hall bearing 70 attached firmly to the bell 30 enabling the bell 30 to execute a rotational movement about its vertical axis. The upper part 75 of the bearing 70 is fixed to the bell 30 while the lower part 85 of the bearing 70 may rotate freely. When the bearing 70 is not under stress, the lower part 80 rests against a stop 85 positioned below the bearing 70.
Of course, this bearing 70 must be protected against the influx of impurities.
The bell 30 is held in position by means of a mounting system (not represented) pressing from below on the lower part 80 of the bearing 70 which pushes the bell 30 against the feed pipe 50. The mounting system for the bell 30 may, for example, comprise mounting tongs.
A preferred mode of execution of an installation according to the invention is described with the help of the appended drawings, in which:
FIG. 1 shows a transverse cross-section through a bell and a ladle filled with molten steel at S rest;
FIG. 2 shows a transverse cross-section through a bell and a ladle filled with molten steel in a working position; and FIG. 3 shows an enlargement of a device for driving the bell.
A ladle 10 having a refractory lining 15 is filled with molten steel 20 and is placed below a refractory bell 30. In the working position, during the treatment of the molten metal, the bell 30 is lowered until its lower edge 40 dips into the molten steel 20 (FIG. 2).
The bell 30 is connected to a feed pipe 50 through which the combustible materials and the alloying elements are introduced into the molten steel 20. It comprises a driving device 60 capable of driving the bell in a rotational movement about a vertical axis.
An inert or reducing bubbling gas may be introduced into the molten steel 20 either through a porous plug (not represented) positioned in the bottom of the ladle 10 or through a lance (not represented) which is introduced into the ladle 10. This bubbling gas is used to homogenise the molten steel 20 contained in the ladle 10 during the treatment of the steel 20. This bubbling gas creates turbulence at the surface of the steel 20 which causes a local wear of the bell 30, particularly of the lower edge 40 of the bell 30.
FIG. 3 shows an enlarged view of the device 60 for driving the bell 30. The upper end of the bell 30 carnes a hall bearing 70 attached firmly to the bell 30 enabling the bell 30 to execute a rotational movement about its vertical axis. The upper part 75 of the bearing 70 is fixed to the bell 30 while the lower part 85 of the bearing 70 may rotate freely. When the bearing 70 is not under stress, the lower part 80 rests against a stop 85 positioned below the bearing 70.
Of course, this bearing 70 must be protected against the influx of impurities.
The bell 30 is held in position by means of a mounting system (not represented) pressing from below on the lower part 80 of the bearing 70 which pushes the bell 30 against the feed pipe 50. The mounting system for the bell 30 may, for example, comprise mounting tongs.
4 An annular gear 90 is provided on the upper part 75 of the bearing 70. The bell 30 is rotated by means of a motor 100 preferably incorporating a reduction gear 110 enabling the rotational speed of the bell 30 to be varied. The motor 100 drives the annular gear 90 through the intermediary of a gear wheel 120 attached firmly to the motor 100. There are of course other means, well known to one skilled in the art, of imparting a rotational movement to such a bell.
Sealing between the feed pipe 50 and the bell 30 is provided by a baffle 130.
The bell 30 and the feed pipe 50 have an inner lining made of a refractory material. This lining is not shown in the figures so as not to impair the clarity of the drawings.
Sealing between the feed pipe 50 and the bell 30 is provided by a baffle 130.
The bell 30 and the feed pipe 50 have an inner lining made of a refractory material. This lining is not shown in the figures so as not to impair the clarity of the drawings.
5
Claims (5)
1. A method for minimizing local wear of a bell during the treatment of a molten metal in a ladle comprising lowering the bell and stopping the lowering of the bell when a lower edge of the bell contacts the molten metal and rotating the bell about an axis during the treatment of the molten metal.
2. The method of claim 1, wherein the rotating of the bell is carried out at a rotation rate suited for producing a lining in situ so as to compensate for local wear.
3. The method of claim 1, wherein the bell is rotated at a rotational speed that is between 0.5 and 2 revolutions per minute.
4. The method of claim 1, further comprising introducing an inert gas to homogenize the molten metal whereby the introduced bubbling gas creates turbulence at the surface of the molten metal which turbulence contacts the lower edge of the bell.
5. The method of claim 1, further comprising introducing a reduction gas to homogenize the molten metal whereby the introduced bubbling gas creates turbulence at the surface of the molten metal which turbulence contacts the lower edge of the bell.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU90005A LU90005B1 (fr) | 1997-01-15 | 1997-01-15 | Procédé et installation pour le traitement de l'acer en poche |
| LU90005 | 1997-01-15 | ||
| PCT/EP1998/000044 WO1998031841A1 (fr) | 1997-01-15 | 1998-01-07 | Procede et installation pour le traitement de l'acier en poche |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2274009A1 CA2274009A1 (fr) | 1998-07-23 |
| CA2274009C true CA2274009C (fr) | 2007-05-01 |
Family
ID=19731652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002274009A Expired - Fee Related CA2274009C (fr) | 1997-01-15 | 1998-01-07 | Procede et installation pour le traitement de l'acier en poche |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US6413469B1 (fr) |
| EP (1) | EP0954615B1 (fr) |
| JP (1) | JP4201214B2 (fr) |
| AT (1) | ATE206471T1 (fr) |
| AU (1) | AU717378B2 (fr) |
| BR (1) | BR9806315A (fr) |
| CA (1) | CA2274009C (fr) |
| DE (1) | DE69801895T2 (fr) |
| LU (1) | LU90005B1 (fr) |
| RU (1) | RU2205879C2 (fr) |
| UA (1) | UA61095C2 (fr) |
| WO (1) | WO1998031841A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7767698B2 (en) * | 2002-06-03 | 2010-08-03 | Mcneil Ab | Formulation and use thereof |
| EP1568790A1 (fr) * | 2004-02-24 | 2005-08-31 | Paul Wurth S.A. | Dispositif pour le traitement de métal liquide en poche |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1942202A (en) * | 1931-04-25 | 1934-01-02 | Ralph F Cohn | Rotator |
| DE1190479B (de) * | 1960-07-07 | 1965-04-08 | Jan Erik Oestberg | Vorrichtung zum Beschleunigen physikalischchemischer Vorgaenge in Metallschmelzen |
| GB1187168A (en) * | 1967-10-24 | 1970-04-08 | Standard Messo Duisburg | Improvements in or relating to the Production of Steel. |
| DE2261138C3 (de) * | 1972-12-14 | 1975-05-15 | Polysius Ag, 4723 Neubeckum | Verfahren zum Einführen von Zuschlagstoffen in ein metallurgisches Bad |
| SU609591A1 (ru) * | 1976-07-08 | 1978-06-05 | Научно-производственное объединение "Тулачермет" | Устройство дл перемещени металла в кристаллизаторе |
| DE2707726A1 (de) * | 1977-02-23 | 1978-08-31 | Kloeckner Humboldt Deutz Ag | Vorrichtung zum trennen einer mischung aus komponenten, insbesondere schmelzfluessiger metalle, metallverbindungen und/oder metallhaltiger schlacke in einem fliehkraftfeld |
| CH656399A5 (de) * | 1981-05-08 | 1986-06-30 | Fischer Ag Georg | Tauch-verdampfungskammer. |
| LU84472A1 (fr) * | 1982-11-17 | 1984-06-13 | Arbed | Procede et installation pour le traitement de l'acier en poche |
| NO155447C (no) * | 1984-01-25 | 1987-04-01 | Ardal Og Sunndal Verk | Anordning ved anlegg for behandling av en vaeske, f.eks. en aluminiumssmelte. |
| DE4234973C1 (de) * | 1992-10-16 | 1994-06-01 | Tech Resources Pty Ltd | Verfahren zum Schutz der feuerfesten Ausmauerung im Gasraum von metallurgischen Reaktionsgefäßen |
| NO176553C (no) * | 1993-04-14 | 1995-04-26 | Norsk Hydro As | Injeksjonsutstyr |
-
1997
- 1997-01-15 LU LU90005A patent/LU90005B1/fr active
-
1998
- 1998-01-07 EP EP98901944A patent/EP0954615B1/fr not_active Expired - Lifetime
- 1998-01-07 RU RU99117542/02A patent/RU2205879C2/ru not_active IP Right Cessation
- 1998-01-07 BR BR9806315-4A patent/BR9806315A/pt not_active IP Right Cessation
- 1998-01-07 AT AT98901944T patent/ATE206471T1/de active
- 1998-01-07 DE DE69801895T patent/DE69801895T2/de not_active Expired - Lifetime
- 1998-01-07 WO PCT/EP1998/000044 patent/WO1998031841A1/fr not_active Ceased
- 1998-01-07 US US09/341,636 patent/US6413469B1/en not_active Expired - Fee Related
- 1998-01-07 AU AU58620/98A patent/AU717378B2/en not_active Ceased
- 1998-01-07 CA CA002274009A patent/CA2274009C/fr not_active Expired - Fee Related
- 1998-01-07 JP JP53361298A patent/JP4201214B2/ja not_active Expired - Lifetime
- 1998-07-01 UA UA99084660A patent/UA61095C2/uk unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE69801895T2 (de) | 2002-04-25 |
| JP4201214B2 (ja) | 2008-12-24 |
| AU717378B2 (en) | 2000-03-23 |
| EP0954615A1 (fr) | 1999-11-10 |
| DE69801895D1 (de) | 2001-11-08 |
| ATE206471T1 (de) | 2001-10-15 |
| BR9806315A (pt) | 2000-03-14 |
| UA61095C2 (uk) | 2003-11-17 |
| JP2001508132A (ja) | 2001-06-19 |
| EP0954615B1 (fr) | 2001-10-04 |
| AU5862098A (en) | 1998-08-07 |
| WO1998031841A1 (fr) | 1998-07-23 |
| RU2205879C2 (ru) | 2003-06-10 |
| US6413469B1 (en) | 2002-07-02 |
| CA2274009A1 (fr) | 1998-07-23 |
| LU90005B1 (fr) | 1998-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140107 |