US3587149A - Furnace installation for continuously descaling a metal band - Google Patents

Furnace installation for continuously descaling a metal band Download PDF

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Publication number
US3587149A
US3587149A US850838A US3587149DA US3587149A US 3587149 A US3587149 A US 3587149A US 850838 A US850838 A US 850838A US 3587149D A US3587149D A US 3587149DA US 3587149 A US3587149 A US 3587149A
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United States
Prior art keywords
trough
hydroxide
molten sodium
metal band
alkali
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Expired - Lifetime
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US850838A
Inventor
Erwin Schumann
Rudolf Kuhn
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DEUTSCHE GOLD-UND SILBER-SCHEIDANSTALT VORMALS ROESSLER
Evonik Operations GmbH
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Degussa GmbH
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/45—Scale remover or preventor
    • Y10T29/4533—Fluid impingement

Definitions

  • ABSTRACT A trough is inclined in a tank of melted alkalihydroxide and has its upper inlet end above the alkalihydroxide. A metal band is descaled by being pulled through molten sodium contained in the trough.
  • This invention relates to a furnace installation for the descaling of endless metal bands in molten sodium with the band running through melted alkali-hydroxide before and after being passed through the molten sodium.
  • This installation has the advantage in that only relatively small amounts of molten sodium are necessary and rolls or cylinders for guiding the metal band through the molten sodium are not necessary.
  • the furnace installation comprises a heated tank containing melted alkali-hydroxide in which a sodiumcontaining pipe or channel is inserted in such a manner that the metal band is immersed in the molten sodium as it is pulled through the molten sodium by means of guiding rollers so that the metal band leaving the molten sodium is submerged in the melted alkali-hydroxide.
  • the line of intersection between the molten sodium and the surface of the melted alkali-hydroxide passes through the molten sodium.
  • the furnace installation is composed of a heated tank 6 containing the melted alkali-hydroxide, a channel-shaped trough 7, rollers 8a, 8b and 8c for guiding the metal band 8d, a protective gas hood 9, a sodium storage container connected to a pipe 11, a heating apparatus 12 associated with container 10, a segmented wire mesh band or ribbon 13 and a driving roller 14 for band 13.
  • the molten sodium during the operation of the installation, is contained in trough 7.
  • the trough is inclined so that its inlet end lies above the molten alkali-hydroxide while its lower outlet is submerged in the alkali-hydroxide.
  • the metal band 8d guided by rollers 8b and 8c is pulled through the trough while being immersed in the molten sodium and leaves trough 7 while being submerged in the melted alkali-hydroxide.
  • the molten sodium floats on top of the melted alkali-hydroxide because of its lower specific weight.
  • the installation is designed so that the intersecting line between the surface of the alkali-hydroxide and the molten sodium lies within trough 7.
  • a protective inert gas such as nitrogen or argon, is introduced through pipe 7a into trough 7 at its upper inlet end where the metal band 8d enters the trough.
  • the hood 9 has the lower edges of its sides submerged in the melted alkali-hydroxide.
  • Molten sodium has to be fed or supplied to trough 7 in a continuous manner in order to maintain the molten sodium at a constant level.
  • solid sodium is supplied to container 10 and melted in the lower portion of container 10 by means of the heating apparatus 12.
  • the molten sodium flows by gravity though pipe 11 into trough 7 with pipe 11 passing through the melted alkali-hydroxide where the sodium is heated to the required operation temperaturei
  • the rate of melting the solid sodium is controlled by the height of the sodium within trough 7 so that when the top level of the molten sodium in trough 7 falls below a desired value the heating apparatus 12 is turned on.
  • a segmented wire mesh band 13 is slowly drawn across the bottom of trough 7.
  • Band 13 is driven by roller 14.
  • the slag or sludge thus removed from trough 7 by band 13 is drawn into the melted alkali-hydroxide from where it can be removed by conventional means.
  • the amount of molten sodium in trough 7 can be kept relatively small. if a leak should develop in the trough at some point or another, then the further advantage lies in that smaller amounts of molten sodium are much easier to handles since then they can be dissolved in the melted alkali-hydroxide. if large amounts of molten sodium are used, then some of the molten sodium could reach the surface of the melted alkali-h droxide and violently react with the atmospheric air.
  • uide rollers lying within the molten sodium are no longer necessary. This eliminates the problem of the material of which the guide rollers are composed with respect to the material reacting with the sodium. in addition to eliminating the guide rollers in the molten sodium, it is also possible to eliminate a deflecting roller outside of the bath. Such shortens the length of the entire installation.
  • the molten sodium in this invention has a relatively small free surface, it is possible to do without the protective gas hood and the inert gas can be introduced into the upper inlet end of the trough 7.
  • the hood can be made substantially shorter.
  • only one guide roller 8b for the metal band 8d lies within the range of the protective gas which, in turn, means that the number of roller shaft openings through the hood, and thus the number of places to be sealed, are reduced to two.
  • a furnace installation for continuously descaling a metal band comprising a heated tank, melted alkali-hydroxide in said tank, an inclined channel-shaped trough in said tank having an upper inlet end above said alkali-hydroxide and a lower outlet end submerged in said alkali-hydroxide, a metal band extending through said trough, roller means (8b, for pulling said band through said trough, and supply means for feeding molten sodium into said trough for immersing said band and with the point of intersection between the molten sodium and said melted alkali-hydroxide lying in said trough.
  • said supply means comprising a sodium storage container above said tank, a pipe between said container and said trough and extending through said alkali-hydroxide, and heating means for melting the sodium in said tank and feeding the molten sodium through said pipe into said trough at a desired level.

Abstract

A TROUGH IS INCLINED IN A TANK OF MELTED ALKALI-HYDROXIDE AND HAS ITS UPPER INLET END ABOVE THE ALKALI-HYDROXIDE. A METAL BAND IS DESCALED BY BEING PULLED THROUGH MOLTEN SODIUM CONTAINED IN THE TROUGH.

Description

United States Patent Inventors Appl. No.
Filed Patented Assignee Priority FURNACE INSTALLATION FOR CONTINUOUSLY Erwin Schumann Rossdorf;
Rudolf Kuhn, Koppel-n, Germany 850,838
Aug. 18, 1969 June 28, 1971 Deutsche Gold-Und Silber-Scheideanstalt Varmals Roesler, Frankfurt (main), (iermany Aug. 27, 1968 Germany DESCALING A METAL BAND 5 Claims, 1 Drawing Fig.
US. Cl
10 SOLID Nd.
[51] Int. Cl B21c 43/04 [50] Field ot'Search 29/81 (R),
(inquired), 81 (C); 72/39; 266/3, 4 (A)(lnquired) [56] References Cited UNITED STATES PATENTS 1,930,601 10/1933 Townsend 266/4AUX 2,141,382 12/1938 Ferm 266/3 2,338,165 1/1944 Caugherty 28/81C 3,182,982 5/1965 Ruff 266/3 3,451,840 6/1969 Hough 29/81C Primary Examiner-Alfred R. Guest Attorneys-Francis D. Stephens and Hugo Huettig, Jr.
ABSTRACT: A trough is inclined in a tank of melted alkalihydroxide and has its upper inlet end above the alkalihydroxide. A metal band is descaled by being pulled through molten sodium contained in the trough.
lNEET GAS MELTED ALKAL/HYDROX/DE PATENTED JUN28 l9?! /NERT GAS 1O SOL/D Na.-
MELTED ALKAL IHYDROX/DE INVENTORS Erwzln Schumann Rudolf Kuhn FURNACE INSTALLATION FOR CONTINUOUSLY DESCALING A METAL BAND This invention relates to a furnace installation for the descaling of endless metal bands in molten sodium with the band running through melted alkali-hydroxide before and after being passed through the molten sodium.
This installation has the advantage in that only relatively small amounts of molten sodium are necessary and rolls or cylinders for guiding the metal band through the molten sodium are not necessary.
In this invention, the furnace installation comprises a heated tank containing melted alkali-hydroxide in which a sodiumcontaining pipe or channel is inserted in such a manner that the metal band is immersed in the molten sodium as it is pulled through the molten sodium by means of guiding rollers so that the metal band leaving the molten sodium is submerged in the melted alkali-hydroxide. The line of intersection between the molten sodium and the surface of the melted alkali-hydroxide passes through the molten sodium.
The means by which the objects of this invention are obtained are described more fully with reference to the accompanying schematic drawing which is a cross-sectional view through the furnace installation of this invention.
The furnace installation is composed of a heated tank 6 containing the melted alkali-hydroxide, a channel-shaped trough 7, rollers 8a, 8b and 8c for guiding the metal band 8d, a protective gas hood 9, a sodium storage container connected to a pipe 11, a heating apparatus 12 associated with container 10, a segmented wire mesh band or ribbon 13 and a driving roller 14 for band 13.
The molten sodium, during the operation of the installation, is contained in trough 7. The trough is inclined so that its inlet end lies above the molten alkali-hydroxide while its lower outlet is submerged in the alkali-hydroxide. The metal band 8d guided by rollers 8b and 8c is pulled through the trough while being immersed in the molten sodium and leaves trough 7 while being submerged in the melted alkali-hydroxide. The molten sodium floats on top of the melted alkali-hydroxide because of its lower specific weight. The installation is designed so that the intersecting line between the surface of the alkali-hydroxide and the molten sodium lies within trough 7. In order to protect the sodium from being oxidized by the air, a protective inert gas, such as nitrogen or argon, is introduced through pipe 7a into trough 7 at its upper inlet end where the metal band 8d enters the trough. In order to reduce the consumption of the inert gas, the hood 9 has the lower edges of its sides submerged in the melted alkali-hydroxide.
Molten sodium has to be fed or supplied to trough 7 in a continuous manner in order to maintain the molten sodium at a constant level. For doing such, solid sodium is supplied to container 10 and melted in the lower portion of container 10 by means of the heating apparatus 12. The molten sodium flows by gravity though pipe 11 into trough 7 with pipe 11 passing through the melted alkali-hydroxide where the sodium is heated to the required operation temperaturei The rate of melting the solid sodium is controlled by the height of the sodium within trough 7 so that when the top level of the molten sodium in trough 7 falls below a desired value the heating apparatus 12 is turned on. In order to prevent slag or sludge from accumulating in trough 7, a segmented wire mesh band 13 is slowly drawn across the bottom of trough 7. Band 13 is driven by roller 14. The slag or sludge thus removed from trough 7 by band 13 is drawn into the melted alkali-hydroxide from where it can be removed by conventional means.
This invention has the following advantages:
1. The amount of molten sodium in trough 7 can be kept relatively small. if a leak should develop in the trough at some point or another, then the further advantage lies in that smaller amounts of molten sodium are much easier to handles since then they can be dissolved in the melted alkali-hydroxide. if large amounts of molten sodium are used, then some of the molten sodium could reach the surface of the melted alkali-h droxide and violently react with the atmospheric air.
uide rollers lying within the molten sodium are no longer necessary. This eliminates the problem of the material of which the guide rollers are composed with respect to the material reacting with the sodium. in addition to eliminating the guide rollers in the molten sodium, it is also possible to eliminate a deflecting roller outside of the bath. Such shortens the length of the entire installation.
3. Since the molten sodium in this invention has a relatively small free surface, it is possible to do without the protective gas hood and the inert gas can be introduced into the upper inlet end of the trough 7. However, when a protective hood is used for reducing the consumption of the inert or protective gas, then in this invention the hood can be made substantially shorter. Furthermore, only one guide roller 8b for the metal band 8d lies within the range of the protective gas which, in turn, means that the number of roller shaft openings through the hood, and thus the number of places to be sealed, are reduced to two.
Having now described the means by which the objects of this invention are obtained,
We claim:
1. A furnace installation for continuously descaling a metal band comprising a heated tank, melted alkali-hydroxide in said tank, an inclined channel-shaped trough in said tank having an upper inlet end above said alkali-hydroxide and a lower outlet end submerged in said alkali-hydroxide, a metal band extending through said trough, roller means (8b, for pulling said band through said trough, and supply means for feeding molten sodium into said trough for immersing said band and with the point of intersection between the molten sodium and said melted alkali-hydroxide lying in said trough.
2. An installation as in claim 1, further comprising means for introducing protective gas into the inlet end of said trough and above said molten sodium.
3. An installation as in claim 1, further comprising a gas hood above said tank and having sides partially submerged in said alkali-hydroxide, and means for introducing protective gas under said hood.
4. An installation as in claim 1, said supply means comprising a sodium storage container above said tank, a pipe between said container and said trough and extending through said alkali-hydroxide, and heating means for melting the sodium in said tank and feeding the molten sodium through said pipe into said trough at a desired level.
5. An installation as in claim 1, further comprising wire mesh segmented band means (13) extending along the bottom of said trough, and drive roller means (14) for slowly dragging said segmented band means along the bottom of said trough to remove scale and sludge.
US850838A 1968-08-27 1969-08-18 Furnace installation for continuously descaling a metal band Expired - Lifetime US3587149A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5411612A (en) * 1993-12-27 1995-05-02 Ford Motor Company Method of scaleless induction heating
US5414246A (en) * 1993-12-27 1995-05-09 Ford Motor Company Apparatus for scaleless induction heating
US5799729A (en) * 1995-05-02 1998-09-01 D.T.I.Dr. Trippe Ingenieurgesellschaft Mbh Device for working the insides of pipes, conduits or the like

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52167741U (en) * 1976-06-14 1977-12-19

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5411612A (en) * 1993-12-27 1995-05-02 Ford Motor Company Method of scaleless induction heating
US5414246A (en) * 1993-12-27 1995-05-09 Ford Motor Company Apparatus for scaleless induction heating
US5799729A (en) * 1995-05-02 1998-09-01 D.T.I.Dr. Trippe Ingenieurgesellschaft Mbh Device for working the insides of pipes, conduits or the like

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JPS5017939B1 (en) 1975-06-25

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