EP0006453B1 - Procédé pour l'augmentation de la durée de vie de cannes de barbotage de gaz à embouts poreux en graphite et cage d'inertisation pour la mise en oeuvre dudit procédé - Google Patents

Procédé pour l'augmentation de la durée de vie de cannes de barbotage de gaz à embouts poreux en graphite et cage d'inertisation pour la mise en oeuvre dudit procédé Download PDF

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Publication number
EP0006453B1
EP0006453B1 EP79101605A EP79101605A EP0006453B1 EP 0006453 B1 EP0006453 B1 EP 0006453B1 EP 79101605 A EP79101605 A EP 79101605A EP 79101605 A EP79101605 A EP 79101605A EP 0006453 B1 EP0006453 B1 EP 0006453B1
Authority
EP
European Patent Office
Prior art keywords
graphite
lance
cage
gas
increasing
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
Application number
EP79101605A
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German (de)
English (en)
Other versions
EP0006453A1 (fr
Inventor
Werner Dr. Bücker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0006453A1 publication Critical patent/EP0006453A1/fr
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1678—Increasing the durability of linings; Means for protecting
    • 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
    • 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
    • F27D2003/168—Introducing a fluid jet or current into the charge through a lance
    • 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
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag

Definitions

  • the invention relates to a method and a device for increasing the service life of gas purging lances with porous purge heads made of graphite for non-ferrous metal melts.
  • the primary focus here is on aluminum melts that are flushed with argon.
  • the melt is cleaned, homogenized and degassed by flushing the molten metal with an inert gas. Rinsing is the last stage of treatment before the melt is poured.
  • the gas purging lance is lowered manually or mechanically into the crucible and the melt is flushed with an inert gas for about 5-10 minutes.
  • the rinsing treatment improves the quality of the castings by maintaining a dense structure and freedom from pores and also achieving good mold filling capacity.
  • the gas purging lances have flushing heads made of porous materials. Since the lances are exposed to the high temperatures of the metal melts, their lifespan is naturally short. This also applies to gas purging lances with flushing heads made of porous graphite, although graphite is a temperature-resistant material and the lance tube can also be made from graphite. The durability of graphite lances is nevertheless low, since the graphite burns out after use in the melt due to atmospheric oxygen.
  • the object of the invention is to increase the durability of such graphite lances by preventing the graphite from burning out after use in the melt.
  • a method has now been found for increasing the service life of gas purging lances with porous graphite purging heads for non-ferrous metal melts, in which, according to the invention, the lance immediately after purging in an inerting cage which surrounds the parts of the lance consisting of graphite with the formation of a gap with an inert gas until the ignition temperature of graphite falls below.
  • the inerting cage for carrying out the method according to the invention preferably consists of two half-shells which adapt to the shape of the parts of the lance made of graphite, forming a narrow gap.
  • the gap should be kept as narrow as possible, since then higher gas velocities are reached, which means that the lance cools down faster.
  • the half-shells can be connected to one another in an articulated manner by a hinge and can be designed to be lockable with one another in the folded state. This enables the lance to be inserted particularly quickly into the inerting cage after use in the melt.
  • the inerting cage is detachably installed on the bottle wagon on which the gas bottle with the purge gas is transported, so that a uniform implement is obtained.
  • FIG. 1 shows the flushing head 1 made of porous graphite of a gas flushing lance.
  • the flushing head 1 is attached to the lance tube 2, which is preferably also made of graphite.
  • the lance tube 2 is surrounded by an inerting cage, which consists of two half-shells 3, 4.
  • the half-shells 3, 4 are connected to one another in an articulated manner by a hinge 5.
  • a plate is welded onto the half-shell 3 and, when closed, represents the bottom of the cage.
  • the half-shells 3, 4 are shaped such that, when closed, they surround the flushing head 1 and the lance tube 2, forming a narrow gap 6, and thus form the inerting cage.
  • Fig. 2 shows the device in cross section.
  • FIG. 3 shows the device according to FIGS. 1 and 2 detachably installed on a bottle trolley 7 by means of a screw connection.
  • a second compressed gas bottle 9 is provided, which contains the nitrogen for cooling and inerting the lance.
  • the argon flows from the bottle 8 through the pressure reducer with flow meter 10, the compressed gas hose 11 and the lance tube 2 and the flushing head 1 into the molten metal, for example aluminum.
  • the gas purging lance has been used in the melt, it is quickly placed on the plate 12 and placed in the half-shell 3.
  • the half-shell 4 is folded onto the half-shell 3 and both half-shells are firmly connected to one another by means of the latch 132.
  • the argon supply is now interrupted and instead the nitrogen supply is released for cooling and inerting.
  • the nitrogen flows out of the compressed gas bottle 9 via the pressure reducer with flow meter 14 and the T-piece 15 into the compressed gas hose 11.
  • the flushing head 1 and the lance tube 2 quickly cooled by the high gas velocity in the narrow gap 6, so that the ignition temperature of graphite is soon fallen below.
  • the inert gas supply is interrupted and the lance can be safely removed from the inerting cage.
  • the inert gas consumption is low.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (5)

1. Procédé pour augmenter la durée de vie de lances d'injection de gaz ayant une tête d'injection poreuse en graphite pour des bains de métaux en fusion non ferreux, procédé caractérisé en ce qu'immédiatement après l'injection, on balaie la lance avec un gaz inerte dans une boîte à inertie qui entoure les parties en graphite de la lance en formant un intervalle (6), jusqu'à ce que l'on soit passé en-dessous de la température d'allumage du graphite.
2. Procédé selon la revendication 1, caractérisé en ce qu'on balaie la lance avec de l'azote.
3. Boîte à inertie pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 et 2, caractérisée en ce qu'elle se compose de deux demi-coquilles (3, 4) qui sont adaptées à la forme des parties en graphite de la lance en formant un faible intervalle (6).
4. Boîte à inertie selon la revendication 3, caractérisée en ce que les demi-coquilles (3,4) sont articulées l'une à l'autre par une charnière (5) et sont susceptibles d'être verrouillées (13) l'une sur l'autre à l'état fermé.
5. Boîte à inertie selon l'une quelconque des revendications 3 et 4, caractérisée en ce qu'elle est montée sur un chariot porte-bouteilles (7) qui sert au transport de la bouteille de gaz comprimé (8) contenant le gaz d'injection.
EP79101605A 1978-06-22 1979-05-25 Procédé pour l'augmentation de la durée de vie de cannes de barbotage de gaz à embouts poreux en graphite et cage d'inertisation pour la mise en oeuvre dudit procédé Expired EP0006453B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2827403 1978-06-22
DE2827403A DE2827403C2 (de) 1978-06-22 1978-06-22 Vorrichtung zur Erhöhung der Lebensdauer von Gasspüllanzen mit einem porösen Grafit · Spülkopf

Publications (2)

Publication Number Publication Date
EP0006453A1 EP0006453A1 (fr) 1980-01-09
EP0006453B1 true EP0006453B1 (fr) 1981-06-03

Family

ID=6042463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79101605A Expired EP0006453B1 (fr) 1978-06-22 1979-05-25 Procédé pour l'augmentation de la durée de vie de cannes de barbotage de gaz à embouts poreux en graphite et cage d'inertisation pour la mise en oeuvre dudit procédé

Country Status (7)

Country Link
US (1) US4264057A (fr)
EP (1) EP0006453B1 (fr)
JP (1) JPS552798A (fr)
AT (1) AT377208B (fr)
DE (1) DE2827403C2 (fr)
ES (1) ES481712A1 (fr)
ZA (1) ZA793085B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29818006U1 (de) * 1998-10-08 1999-03-11 Carbon Ind Produkte Gmbh Gaseinleitungssystem für Schmelzbäder

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU33708A1 (fr) *
US3112194A (en) * 1960-10-19 1963-11-26 Union Carbide Corp Molten bath treating method and apparatus
US3304173A (en) * 1961-07-27 1967-02-14 United States Steel Corp Method of adding solids and oxygen to an open hearth furnace
NL296346A (fr) * 1962-08-07
US3269829A (en) * 1963-09-24 1966-08-30 United States Steel Corp Method and apparatus for introducing steam and oxygen into a bath of molten steel
US3503597A (en) * 1967-02-20 1970-03-31 Kessler Harry Harvey Metal treating device
US3521874A (en) * 1967-05-12 1970-07-28 Reynolds Metals Co Gas diffuser unit for use in treating molten metal
US3932172A (en) * 1969-02-20 1976-01-13 Eisenwerk-Gesellschaft Maximilianshutte Mbh Method and converter for refining pig-iron into steel
FR2263308A1 (en) * 1974-03-08 1975-10-03 Combustible Nucleaire Purification of molten uranium to prevent axial fissures - occurring in continuous casting, by washing the melt with inert gas

Also Published As

Publication number Publication date
DE2827403B1 (de) 1979-08-02
AT377208B (de) 1985-02-25
EP0006453A1 (fr) 1980-01-09
US4264057A (en) 1981-04-28
ZA793085B (en) 1980-08-27
JPS552798A (en) 1980-01-10
DE2827403C2 (de) 1980-04-03
ES481712A1 (es) 1980-02-16
ATA388479A (de) 1984-07-15

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