WO2006125655A2 - Composant refractaire et procede de fabrication - Google Patents

Composant refractaire et procede de fabrication Download PDF

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Publication number
WO2006125655A2
WO2006125655A2 PCT/EP2006/005012 EP2006005012W WO2006125655A2 WO 2006125655 A2 WO2006125655 A2 WO 2006125655A2 EP 2006005012 W EP2006005012 W EP 2006005012W WO 2006125655 A2 WO2006125655 A2 WO 2006125655A2
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
well block
block according
refractory
well
Prior art date
Application number
PCT/EP2006/005012
Other languages
English (en)
Other versions
WO2006125655A3 (fr
Inventor
John Ford
John Harvey
Original Assignee
Vesuvius Crucible Company
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vesuvius Crucible Company filed Critical Vesuvius Crucible Company
Publication of WO2006125655A2 publication Critical patent/WO2006125655A2/fr
Publication of WO2006125655A3 publication Critical patent/WO2006125655A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor

Definitions

  • Refractory component and process for making the same.
  • the present invention relates to refractory components and more particularly to well blocks for use in metallurgical vessels for containing molten metals.
  • Well blocks or bricks are adapted for receiving a pouring nozzle or a porous plug and are generally disposed on the bottom of a vessel such as a ladle, a tundish or the like.
  • Metallurgical vessels containing molten metal are comprised of an outer metallic shell that is lined with refractory material.
  • the lining generally comprises one or more layers of bricks.
  • a well block is arranged within the refractory lining, the well block having a bore therethrough to allow the molten metal to exit from the vessel.
  • a slide gate may be located downstream of the well block for regulating the flow of molten metal exiting the vessel.
  • a pouring nozzle so-called inner nozzle, which is in connection with the upper plate of the slide gate, is used and is inserted into the well block.
  • the bore or inner surface of the well block is adapted to the external shape of the inner nozzle.
  • the sliding plates and the inner nozzle have to sustain high mechanical or thermal stresses as well as chemical attacks. Their service life is much shorter than the lining of the vessel and is typically about 10 to 30 heats for an inner nozzle.
  • the inner nozzle is generally replaced in a hot environment. This is a difficult operation that sometimes requires multiple human interventions. Another known technique is to repair by help of cement or mortar the inner nozzle to postpone its replacement. This is also done in a hot environment leading to the same safety issues.
  • the well block inner surface is commonly covered by a skuii of frozen metal and this makes the repairing or replacement operation even more critical.
  • Document GB 2, 083, 896 relates to well blocks made of two different concretes which are successively cast one in contact with the other forming a unitary refractory body.
  • the bottom part of the well block is made of a low thermal conductivity and less refractory concrete material than the top part.
  • the upper part of the well block which is the area exposed to the highest temperature and on occasions which has to be burned out by oxygen lancing is made of high duty material to increase the service life of the well block.
  • Document US 5,718,415 relates to a flow control device made of a refractory composition such as magnesia or alumina-based refractories.
  • the well block is a two part well block, the two parts being assembled by the help of mortar.
  • the upper part of the well block is a semi disposal item being replaced after 2 to 5 heats. This replacement operation is critical has explained above.
  • Other known well blocks and particularly the well block disclosed in the document WO 03/092927 or US 5,849,245 are made of carbon bonded material isostatically pressed. The use of a carbon bonded material increases the wear resistance and the service life of the well block and this significantly with respect to concrete and castable material as the ones used in Documents GB 2, 083, 896 or US 5,718,415.
  • the well block according to the invention comprises a body formed of a refractory material, said body comprising an inner surface defining a bore for flow passage, the inner surface being adapted for receiving a nozzle.
  • Said body comprises a sleeve located at the level of the inner surface, the sleeve being made of a pressed refractory material.
  • the sleeve can be pressed in an isostatic press, a hydraulic press, a friction press or the like.
  • the isopressing process being preferred as it provides uniform pressing properties, fairly uniform wall thickness and more complex shapes of the sleeve can be achieved.
  • the sleeve is made from a carbon bonded material.
  • Material can be selected from magnesia, alumina, corundum, spinel, zirconia and graphite or a combination thereof.
  • the material should contain a minimum quantity of carbon.
  • the carbon bonded sleeve provides an easier release and repair of the inner nozzle because of its carbon content.
  • Carbon or graphite is a non wetting agent for the molten metal so the adherence of a frozen metal skull will be weaker. This results in easier repair or release of the inner nozzle.
  • the sleeve preferably comprises from 5 to 25 weight % of carbon and more preferably from 5 to 15 %.
  • the sleeve After pressing, the sleeve is dried or cured.
  • the sleeve can also be fired or sintered depending on the application. Addition of antioxidants to the refractory composition is generally advantageous.
  • a suitable composition for the sleeve would be an alumina magnesia graphite material based on corundum, magnesia and about 8 % natural flake graphite with antioxidant added.
  • the sleeve is preferably positioned in the upper part of the well block inner surface. The bottom part of the inner surface being made of castable refractory material. This way, the slide gate mechanism and refractories remain insulated.
  • the sleeve is preferably located so that the top part of the inner nozzle is inside the sleeve.
  • the skull is more likely to form in this region and is thus preferable that the top part of the inner nozzle be in contact with the sleeve.
  • the shape of the sleeve depends on the inner nozzle design.
  • the inner bore will generally be conical/straight to suit the nozzle design.
  • the thickness of the sleeve varies with the application and the size of the well block and related inner nozzle. Thickness will preferably be in the 30 to 100 mm range.
  • Another object of the invention is the process for making a well block according to the invention.
  • the process comprises the steps of pressing a sleeve drying or curing the sleeve positioning the sleeve in a casting mould casting refractory material around the sleeve in the remaining space of the mould - drying or curing the sleeve and the cast refractory material
  • the well block made according to this process is a one-piece unitary well block that can be easily handled.
  • the pressing can take place in an isostatic press, a hydraulic press, a friction press or the like.
  • the isopressing process being preferred as it provides uniform pressing properties, fairly uniform wall thickness and more complex shapes of the sleeve can be achieved.
  • the pressing pressure being chosen to obtain the desired density.
  • the sleeve after drying or curing can also be fired or sintered prior to being cast around with refractory material.
  • the second process comprises the steps of pressing a sleeve drying or curing the sleeve positioning the sleeve in a pressing mould - filling the remaining space of the mold with refractory material pressing the sleeve and the refractory material drying the sleeve and the refractory material
  • the sleeve can also be iso-pressed and fired or sintered prior to the second pressing.
  • Two or more refractory materials can be used in these two processes. For instance, a lower thermal conductive material for the bottom part of the well block and a high wear resistant material for the top part. This way, the heat transfer to the slide gate plates and mechanism is further reduced.
  • Figure 1 shows a well block (1 ) according to the state of the art.
  • the well block (1 ) is a one- piece unitary well block.
  • the well block (1) is made of a cast material as for instance an alumina spinel castable.
  • the well block (1 ) is positioned on the bottom of the metallurgical vessel in the lining (3).
  • the inner nozzle (5) is inserted into the well block and maintained by the help of mortar (not shown).
  • a slide gate mechanism comprising sliding plates (4) is attached under the vessel for flow regulation.
  • Figure 2 shows a well block according to a first embodiment of the invention.
  • the well block (1) is a one-piece unitary well block and is positioned on the bottom of the metallurgical vessel in the lining (3).
  • a sleeve (2) made of carbon bonded material is located in the upper part of the inner surface (7) of the well block (1).
  • the refractory material (8) around the sleeve (2) is an alumina spinel castable.
  • the inner nozzle (5) is assembled into the well block (1) by the help of mortar or the like.
  • the sleeve (2) is located so that the top part of the inner nozzle (5) is inside the sleeve (2). This way the adherence of skull of metal is avoided or reduced and nozzle repair or release is easier.
  • Figure 3 shows another embodiment of a well block (1 ) according to the invention.
  • the well block (1) comprises a sleeve (2) in the upper part of the inner surface (7) of the well block (1 ) as in figure 2.
  • two different types of refractory materials type (8a) and type (8b) have been used for the rest of the well block, type b being more insulating than type a so that less heat of the melt flowing through the inner nozzle (5) is transmitted to the plates (4) and slide gate mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

La présente invention concerne un puits de coulée destiné à un récipient métallurgique. Ce bloc (1) est conçu pour recevoir une buse (5) ou un bouchon poreux. Il est constitué d'un manchon comprimé en carbone collé (2) présentant une résistance accrue à l'usure et une plus grande facilité de réparation de la buse. L'invention concerne également un procédé de fabrication du puits de coulée.
PCT/EP2006/005012 2005-05-26 2006-05-26 Composant refractaire et procede de fabrication WO2006125655A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05076231.9 2005-05-26
EP05076231 2005-05-26

Publications (2)

Publication Number Publication Date
WO2006125655A2 true WO2006125655A2 (fr) 2006-11-30
WO2006125655A3 WO2006125655A3 (fr) 2007-04-19

Family

ID=35500941

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/005012 WO2006125655A2 (fr) 2005-05-26 2006-05-26 Composant refractaire et procede de fabrication

Country Status (1)

Country Link
WO (1) WO2006125655A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023121002A (ja) * 2022-02-18 2023-08-30 品川リフラクトリーズ株式会社 ノズルおよびノズルの製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601944A (en) * 1978-03-14 1981-11-04 Glocast Products Ltd Well blocks for ladles
GB2083896A (en) * 1980-09-15 1982-03-31 Ksr International Ltd Refractory blocks for metal pouring vessels
WO1996007496A1 (fr) * 1994-09-02 1996-03-14 Foseco International Limited Dispositif de commande d'ecoulement
US5849245A (en) * 1996-05-28 1998-12-15 Tokyo Yogyo Kabushiki Kaisha Well brick of vessel for molten metal
WO2003092927A2 (fr) * 2002-04-29 2003-11-13 North American Refractories Co. Bloc poreux pour convertisseur metallurgique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601944A (en) * 1978-03-14 1981-11-04 Glocast Products Ltd Well blocks for ladles
GB2083896A (en) * 1980-09-15 1982-03-31 Ksr International Ltd Refractory blocks for metal pouring vessels
WO1996007496A1 (fr) * 1994-09-02 1996-03-14 Foseco International Limited Dispositif de commande d'ecoulement
US5849245A (en) * 1996-05-28 1998-12-15 Tokyo Yogyo Kabushiki Kaisha Well brick of vessel for molten metal
WO2003092927A2 (fr) * 2002-04-29 2003-11-13 North American Refractories Co. Bloc poreux pour convertisseur metallurgique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023121002A (ja) * 2022-02-18 2023-08-30 品川リフラクトリーズ株式会社 ノズルおよびノズルの製造方法
JP7364944B2 (ja) 2022-02-18 2023-10-19 品川リフラクトリーズ株式会社 ノズルおよびノズルの製造方法

Also Published As

Publication number Publication date
WO2006125655A3 (fr) 2007-04-19

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