EP0312549A1 - Element en ceramique ignifuge. - Google Patents

Element en ceramique ignifuge.

Info

Publication number
EP0312549A1
EP0312549A1 EP87907419A EP87907419A EP0312549A1 EP 0312549 A1 EP0312549 A1 EP 0312549A1 EP 87907419 A EP87907419 A EP 87907419A EP 87907419 A EP87907419 A EP 87907419A EP 0312549 A1 EP0312549 A1 EP 0312549A1
Authority
EP
European Patent Office
Prior art keywords
component according
porous section
gas
ceramic
molten metal
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.)
Granted
Application number
EP87907419A
Other languages
German (de)
English (en)
Other versions
EP0312549B1 (fr
Inventor
Lorenz Dotsch
Peter Schrader
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.)
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
Original Assignee
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
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 RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE filed Critical RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
Priority to AT87907419T priority Critical patent/ATE51252T1/de
Publication of EP0312549A1 publication Critical patent/EP0312549A1/fr
Application granted granted Critical
Publication of EP0312549B1 publication Critical patent/EP0312549B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/119—Refining the metal by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters
    • 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
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/066—Treatment of circulating aluminium, e.g. by filtration
    • 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
    • C22B9/055—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ while the metal is circulating, e.g. combined with filtration

Definitions

  • the invention relates to a refractory ceramic component for separating contaminants from molten metals.
  • the ceramic filters mainly consist of open-pored filter bodies in foam structure with a certain porosity in a defined range.
  • the finest particles are physically deposited on the walls within the filter body, as a result of which the metal melt is “cleaned”.
  • Such ceramic "filter filters” are, for example, from German Offenlegungsschriften 28 05 611, 33 14 796,
  • refractory ceramic component for separating contaminants from molten steel, which is used in particular in distribution channels (intermediate containers) in continuous casting plants.
  • dams which are preferably arranged on the bottom of a distribution channel.
  • the dams should serve to even out the flow velocity and above all to calm the molten metal in the distribution channel. In this way it is achieved that the metal melt given in the tundish can be transported evenly over the area and the volume of the intermediate container on the way to the different spouts.
  • non-metallic contaminants such as slag particles, aluminum particles or other steel contaminants can rise to an increased extent in the molten metal and then be bound in the covering compound applied to the molten metal.
  • EP-A-173 147 discloses a multi-stage dam arrangement for a tundish, the dam extending in the longitudinal direction between the two end faces of the tundish. With the known dam, the "dead volume" within the tundish is to be reduced and the treatment of the molten metal in the tundish is to be evened out.
  • a tundish dam is also shown in EP-A-124 667, which also suggests that the dam be made from refractory materials with a certain fiber content.
  • the known ceramic refractory components for separating contaminants from molten metals lead to an improvement in the quality of the cast products; nevertheless, an improvement in quality is sought in particular with regard to an increased separation of non-metallic impurities.
  • the object of the invention is to propose a refractory ceramic component with which the degree of separation of impurities from molten metals is increased.
  • the component should preferably be retrofittable and one - in particular against over conventional ceramic filters - have increased service life.
  • the invention is based on the knowledge that the degree of separation of impurities from molten metals can be improved considerably if the melt is not only calmed by "barriers" and optionally passed through an open-pore ceramic filter, but is simultaneously subjected to an inert gas treatment.
  • the invention proposes a refractory ceramic component for separating contaminants from a metal melt with a porous section for carrying out the metal melt and a device for supplying an inert gas in the area of the porous section.
  • the porous section should preferably consist of an open-cell ceramic molded body, the offer foam ceramics mentioned at the outset, known from the prior art, in a special way.
  • Shaped bodies made of an organic polymer foam mixed with a ceramic slip are preferred here.
  • the porous section can, according to an alternative embodiment of the invention, also be made of a filter fabric made of a refractory fiber, optionally applied to a support body.
  • a corresponding filter element is described in DE-OS 33 40 417.
  • the porous section consists of several components arranged one behind the other at a distance (viewed in the direction of flow of the melt): a kind of step-by-step filtration arises, which increases the degree of separation of the impurities.
  • porous section lies in a dense ceramic receiving part is preferred both in terms of production and in use. This creates a kind of frame for holding a filter.
  • the receiving part For the application area in question, it is advisable to manufacture the receiving part from a ceramic material with high resistance to temperature changes, for example from a high-alumina mass.
  • the receiving part can be both cast and pressed.
  • the (dense) receiving part also takes on the function of the dams known from the prior art.
  • the molten metal is retained on the receiving part and can only flow off through the porous section.
  • the filter Preferably encloses the.
  • Receiving part of the filter on all sides, the latter having a cuboid shape and can be mortared in the receiving part, for example.
  • the invention offers various alternative embodiments, which can also be implemented cumulatively in one and the same refractory ceramic component.
  • the device for supplying an inert gas consists of a gas line which preferably runs parallel to the porous section and with at least one gas outlet opening in the direction of the porous section.
  • the invention proposes to arrange the gas line below the porous section. This ensures that the inert gas flows from bottom to top and thus practically through the entire weld pool.
  • the gas line can also be arranged on one or both side surfaces of the filter be arranged, the gas outlet openings should then be arranged substantially perpendicular to the direction of flow of the molten metal. This results, particularly together with a gas line below the porous section, in a particularly intensive inert gas treatment and thus a particularly high cleaning performance.
  • the gas line or its gas outlet opening (s) can run both in front of and behind the porous section and, in a further embodiment, also between individual components of the porous section (in each case viewed in the flow direction of the molten metal).
  • the filter is preferably either inserted from above into the receiving part, or, according to a further advantageous embodiment, for example, inserted via a corresponding tongue and groove arrangement, or else the receiving part itself is also open at the top in the corresponding area, so that the impurities rise easily and - as described above - can be bound in a covering compound.
  • the gas outlet opening (s) can be designed in different ways.
  • a slit (channel) opening through which the gas can exit like a closed curtain.
  • the area of application of a device according to the invention is fundamentally not restricted.
  • the component can be used both in foundries, where sand, mold or investment castings are manufactured for all possible applications, as well as in continuous casting plants (here preferably in a distribution channel).
  • the component according to the invention fulfills the function of a "gas-spouting tundish dam" and thus several functions simultaneously, as described in detail above.
  • the component according to the invention is not limited to the described embodiments either with regard to its geometry or its arrangement in a melt treatment plant.
  • other known materials can also be used for the production of the receiving part or porous body.
  • the specialist will select suitable qualities here.
  • FIG. 1 is a perspective view of a refractory component according to the invention
  • FIG. 2 a front view of the component according to FIG. 1
  • Figure 4 the arrangement of a component according to the invention in an intermediate container.
  • a refractory component according to the invention is generally identified by reference number 10.
  • It consists of a frame-shaped receiving part 12 made of a high-alumina, cast and vibrated mass with a central square passage opening 14.
  • a cuboid porous section 16 (hereinafter referred to as filter) sits in the through opening 14.
  • the filter 16 is fixedly connected to the receiving part 12 via a refractory mortar joint 18.
  • the filter 16 is a sintered molded body produced from an organic polymer foam in a mixture with a ceramic slip. Its chemical analysis (in percent by weight) and physical characteristics are as follows:
  • the filter 16 Due to its open porosity, the filter 16 enables a metal melt to flow through from the front 20 to the rear 22.
  • the network of interconnected pores of the filter 16 has a positive filtering effect, particles with a diameter that is considerably smaller than the average pore size also being collected in the branched filter network. In this way, non-metallic inclusions in the ⁇ m range can be filtered off.
  • the molten metal has to "zigzag” through the filter network, the flow of the molten metal is aligned and the damage caused by a "foaming molten metal" such as oxide films and non-metallic inclusions are reliably prevented.
  • a slight initial flow resistance during "casting" means that a largely constant metallostatic pressure is maintained during the passage of the molten metal through the filter.
  • a plurality of gas outlet channels 30 run upward from the gas line 26 and emerge from the latter at a projecting step 32 on the surface of the lower frame part 24.
  • the stage 32 is formed in that the filter 10 is arranged somewhat to the rear (in the direction of flow F of the melt (not shown)) in the receiving part 12, as a result of which the stage 32 rotates on all sides.
  • the component is first installed in a distributor channel 34 in the path of the molten metal. Since the molten metal flows essentially horizontally in the distribution channel, the refractory component is set up approximately perpendicular to the direction of flow.
  • the molten metal is poured from a pouring ladle (not shown) into the distribution channel 34 via a spout, the pouring region of the pouring jet being identified by reference number 36.
  • the component 10 initially acts as a dam until the molten metal passes through the filter 16.
  • the gas line 26 has previously been connected to an external gas supply, so that an inert gas, preferably argon or the like, flows through the gas outlet channels 30 and rises in front of the front side 20 of the filter 16.
  • an inert gas preferably argon or the like
  • the intensity of the gas flow can be adapted to the respective area of application.
  • the flushing line 26 can also be raised laterally next to the filter 16 in the receiving part 12 and formed with corresponding gas outlet channels, so that in addition to the gas flow from the bottom up, there is also a horizontal gas injection, which further optimizes the flushing effect.
  • the filter Due to the cleaning of the molten metal before it is passed through the foam filter, fewer contaminants get into it. As a result, the filter remains functional for longer than is known from the prior art, that is to say it clogs more slowly and therefore also needs to be replaced less frequently.
  • the principle on which the component according to the invention is based can also be applied if the melt flows through a filter from top to bottom. In individual cases, the gas supply direction must then be set so that the melt can be cleaned appropriately before it enters the filter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Filtering Materials (AREA)

Abstract

Un élément en céramique ignifuge sert à séparer des impuretés d'une masse métallique fondue. L'élément comprend une section poreuse (16) d'écoulement de la masse métallique fondue et une conduite (26) d'amenée d'un gaz inerte.
EP87907419A 1986-12-10 1987-11-19 Element en ceramique ignifuge Expired - Lifetime EP0312549B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87907419T ATE51252T1 (de) 1986-12-10 1987-11-19 Feuerfestes keramisches bauteil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863642201 DE3642201C1 (de) 1986-12-10 1986-12-10 Feuerfestes keramisches Bauteil
DE3642201 1986-12-10

Publications (2)

Publication Number Publication Date
EP0312549A1 true EP0312549A1 (fr) 1989-04-26
EP0312549B1 EP0312549B1 (fr) 1990-03-21

Family

ID=6315900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87907419A Expired - Lifetime EP0312549B1 (fr) 1986-12-10 1987-11-19 Element en ceramique ignifuge

Country Status (3)

Country Link
EP (1) EP0312549B1 (fr)
DE (1) DE3642201C1 (fr)
WO (1) WO1988004331A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021034559A1 (fr) * 2019-08-19 2021-02-25 Harbison Walker International, Inc. Article de diffusion

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642679B3 (fr) * 1988-12-22 1990-11-30 Unimetall Sa Dispositif d'elimination des inclusions non metalliques dans un repartiteur de coulee continue de l'acier
AU8303591A (en) * 1990-08-03 1992-03-02 Alcan International Limited Liquid metal filter
US5114472A (en) * 1990-12-13 1992-05-19 Aluminum Company Of America Multistage rigid media filter for molten metal and method of filtering
EP0541861A1 (fr) * 1991-11-11 1993-05-19 Hirayama Setsubi Kabushiki Kaisha Cadre de montage pour un filtre disposé devant un plafond d'une salle blanche
DE4205853C1 (de) * 1992-02-26 1993-10-14 Veitscher Magnesitwerke Ag Feuerfestes keramisches Fertigbauteil zum Einbau in einem Verteiler
WO2018050751A1 (fr) * 2016-09-16 2018-03-22 Technische Universität Bergakademie Freiberg Procédé de purification d'un métal en fusion dans un four à induction
NL2021507B1 (en) * 2018-08-28 2020-03-09 Space Xyz B V Assembly and method for producing metal powder

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US4067731A (en) * 1975-07-18 1978-01-10 Southwire Company Method of treating molten metal
US4154689A (en) * 1976-09-30 1979-05-15 Swiss Aluminium Ltd. Filtering and inline degassing of molten metal
CA1082894A (fr) * 1977-02-22 1980-08-05 John C. Yarwood Methode pour preparer de la mousse poreuse
US4277281A (en) * 1979-08-16 1981-07-07 Southwire Company Continuous filter for molten copper
JPS581025A (ja) * 1981-05-27 1983-01-06 Sumitomo Light Metal Ind Ltd 溶融金属の処理装置
DE3314796A1 (de) * 1983-04-23 1984-10-25 Mayer-Reiland, geb.Reiland, Eva-Maria, 6710 Frankenthal Ansatz zur herstellung von hochschmelzender schaumkeramik sowie verfahren zu deren herstellung
AU1420183A (en) * 1983-05-03 1984-11-08 Aikoh Co. Ltd. Tundish for steel casting
NL8402158A (nl) * 1983-07-09 1985-02-01 Sumitomo Cement Co Poreus keramisch materiaal en werkwijze voor de bereiding daarvan.
DE3340417A1 (de) * 1983-11-09 1985-05-15 Gebrüder Lüngen GmbH & Co KG, 4006 Erkrath Filterelement zum filtrieren von metallschmelzen
US4803025A (en) * 1984-04-23 1989-02-07 Swiss Aluminium Ltd. Ceramic foam
JPS6144778A (ja) * 1984-08-03 1986-03-04 株式会社デンソー 多孔セラミツク体の製造方法
US4591135A (en) * 1984-08-15 1986-05-27 Inland Steel Company Fluid flow control structure for tundish

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8804331A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021034559A1 (fr) * 2019-08-19 2021-02-25 Harbison Walker International, Inc. Article de diffusion
US11338357B2 (en) 2019-08-19 2022-05-24 Harbisonwalker International, Inc. Diffusion article
AU2020334866B2 (en) * 2019-08-19 2022-11-24 Harbison Walker International, Inc. Diffusion article
US11701705B2 (en) 2019-08-19 2023-07-18 Harbisonwalker International, Inc. Diffusion article

Also Published As

Publication number Publication date
EP0312549B1 (fr) 1990-03-21
DE3642201C1 (de) 1988-06-16
WO1988004331A1 (fr) 1988-06-16

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