EP0329645B1 - Brique de brassage au gaz - Google Patents

Brique de brassage au gaz Download PDF

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Publication number
EP0329645B1
EP0329645B1 EP89890042A EP89890042A EP0329645B1 EP 0329645 B1 EP0329645 B1 EP 0329645B1 EP 89890042 A EP89890042 A EP 89890042A EP 89890042 A EP89890042 A EP 89890042A EP 0329645 B1 EP0329645 B1 EP 0329645B1
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EP
European Patent Office
Prior art keywords
flow channels
gas
plug
channels
refractory
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 - Lifetime
Application number
EP89890042A
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German (de)
English (en)
Other versions
EP0329645A1 (fr
Inventor
Rudolf Handler
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.)
Veitscher Magnesitwerke AG
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Veitscher Magnesitwerke AG
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Application filed by Veitscher Magnesitwerke AG filed Critical Veitscher Magnesitwerke AG
Publication of EP0329645A1 publication Critical patent/EP0329645A1/fr
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    • 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
    • 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
    • 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

Definitions

  • the invention relates to a gas purging plug for metallurgical vessels, comprising a refractory molded body with continuous flow channels.
  • the gas purging stones can either contain a refractory stone body of high porosity, in which case the gas passage takes place through the open pores between the refractory grains, or they contain a little or non-porous refractory stone body in which slots or channels are formed through which the gas passage takes place . In the latter case, one speaks of gas purging stones with directed porosity.
  • refractory moldings which are provided with narrow channels for blowing gas into a molten metal bath can be produced in that cores or mandrels which are intended to form the channels are arranged in a mold for the molding and secured in place. A pourable refractory mass is then introduced into the mold and compacted. The molding obtained is stripped off and dried.
  • the cores or mandrels intended for the formation of the channels can be metal tubes which remain in the finished shaped body or wires which are pulled out of the shaped body, which is facilitated if the wires are provided with a coating.
  • the cores or mandrels can also be made of a meltable or evaporable material, e.g. made of plastic, which melts or evaporates during the drying process.
  • the production of shaped bodies with curved channels was also considered, but without information about the purpose of such a measure or the type of curvature.
  • the gas In operation, the gas must only be blown through the sink during certain times, for example during freshening. In the meantime, for example during sampling or during parting or loading, the gas supply could be switched off. If you do this however, it has the consequence that molten metal penetrates into the gas channels or into the stone pores, solidifies there and clogs the channels or pores. When gas blowing resumes, the metal melt which has penetrated is only partially melted and blown out again. In order to prevent the penetration of molten metal, a gas, for example an inert gas, is usually blown through the sink. However, this requires a constant gas supply to the furnace or vessel, which is why this measure can only be used with stationary ovens or vessels.
  • the flushing performance decreases over time due to the deposition of solidified and not remelted metal.
  • the rinsing efficiency is approximately between 40% and 85% for pan sinks with directed porosity and between approximately 60% and 95% of the theoretical rinsing capacity for porous pan sinks.
  • the sink blocks cannot be in use during their full theoretical lifespan, but must be replaced after a fraction of this time, which corresponds to the percentages mentioned.
  • the object of the invention is to design the gas purging plug so that the melting and blowing out of the metal infiltration is possible to a large extent after each blow interruption.
  • a gas purging plug containing a refractory molded body with continuous flow channels in that the flow channels, at least in the area adjacent to their outlet openings, are arranged at a high inclination with respect to the direction of the longitudinal axis of the purging plug, so that they have an angle of inclination between 15 ° and Have 60 °, preferably between 20 ° and 50 °, relative to that end face of the sink which contains the outlet openings of the flow channels.
  • the penetrating metal melt drops travel the same length in the conventional flow channels and in the inclined channels designed according to the invention, that is Penetration depth, measured in the direction of the longitudinal axis of the sink, is less in the channels designed according to the invention than in the conventional channels. Since the melting of the infiltrated metal drops due to the temperature gradient in the direction of the longitudinal axis of the sink is only possible in the vicinity of the hot-sided sink surface, the chances of melting and flushing out after the blow interruption are greater in the gas channels designed according to the invention than in the conventional channels.
  • the sink stones are subject to wear during the course of operation, the sink area that was originally located inside the stone becomes the hot-sided sink surface after some operating time.
  • the sink block according to the invention can also be designed in such a way that the inclined, in particular helical, wave or zigzag-shaped design of the flow channels about two thirds of the stone height is sufficient, as seen from the face of the stone containing the outlet openings.
  • the exiting gas jet is given a swirl, as a result of which the above-mentioned kickback effect is reduced and wear is reduced.
  • the formation of this swirl can be further favored in that the flow channels have the same inclination in each stone cross section in a rotationally symmetrical arrangement.
  • the flushing stones according to the invention can be produced in a manner known per se and described at the outset by embedding channel-forming cores in a stone body made of refractory casting compound.
  • cores for example, burnable, meltable or evaporable materials, such as plastics, come with a covering, e.g. made of plastic, provided wires or thin metal tubes, e.g. made of copper or steel.
  • These cores are dimensioned so that the resulting flow channels have a clear width in the order of 1 mm or less.
  • Suitable casting compounds are primarily those based on high alumina or alumina or so-called "low cement castables", ie casting compounds which contain about 5% by weight of cement.
  • the basic materials of these casting compounds are primarily sintered alumina, corundum, mullite, mullite clinker with 50 to 72% by weight of Al2O3, bauxite, sintered bauxite or andalusite.
  • Chromium oxide CR2O3, zirconium (zirconium silicate), zirconium oxide, clay and calcined clay are suitable as additives to these materials.
  • the casting compounds can be hydraulically bound, e.g. with alumina cement, or chemically bound, e.g. with a phosphate binder. Casting compositions based on magnesia, for example as described in AT-B-248 936, can also be used.
  • FIG. 1 to 3 three exemplary embodiments of the gas purging plug according to the invention are shown in a schematic, diagrammatic illustration, partially cut away.
  • Fig. 4 shows a detail of the sink of Fig. 2 in longitudinal section.
  • a refractory molded body 1 made of refractory casting compound, a sheet metal jacket 2 and a bottom sheet 3 welded to the latter, to which a gas supply pipe 4 is attached in the center.
  • This tube 4 opens into a gas distribution chamber which is filled with a gas-permeable plate 5 made of porous refractory material.
  • a gas-permeable plate 5 made of porous refractory material.
  • a porous refractory material can be used, which has been produced according to the method of AT-B-374 164.
  • the gas purging plug sits in a perforated brick 6, of which only a quarter is shown for reasons of clarity.
  • Flow channels 7 are arranged in the refractory molded body 1 and are formed in a helical shape in the exemplary embodiment shown in FIG. 1.
  • the gas purging plug shown has 17 such flow channels 7, which are arranged evenly distributed over the circular cross section. For the sake of clarity, only one such flow channel 7 is shown in the drawing and some others are indicated.
  • the flow channels run from the gas distribution chamber filled with the gas-permeable plate 5 on the cold side of the sink to its hot-side end face 8, in which the outlet openings of the flow channels 7 are located.
  • the sink it can be carried out in an advantageous manner that first the sheet metal jacket 2, the bottom plate 3 and the gas supply pipe 4 are welded to one another and the gas-permeable plate 5 and the cores for forming the flow channels 7 are inserted into the resulting cavity and inserted into them Secures location. Then a refractory casting compound is introduced, compacted and then dried by heating. If the cores consist of a heat-consumable (burn-out, meltable or evaporable) material, such as plastic, or of wires covered with such a material, the flow channels 7 are formed during drying. In the case of the wires, they can remain in the sink and the gas passage takes place due to the space being freed up due to the disappearance of the sheath.
  • a heat-consumable (burn-out, meltable or evaporable) material such as plastic
  • wires covered with such a material the flow channels 7 are formed during drying. In the case of the wires, they can remain in the sink and the gas passage takes place due to the space being
  • 2 corresponds to that of FIG. 1 with the difference that the flow channels 7 'are zigzag or wave-shaped and that the gas distribution chamber 9 is designed as a cavity.
  • 2 can be produced in the same manner as described in FIG. 1, but instead of the gas-permeable plate 5, a correspondingly shaped body made of an edible material, e.g. Styrofoam is introduced, which disappears when heated while the casting compound dries and releases the gas distribution chamber.
  • an edible material e.g. Styrofoam
  • the flow channels 7 ' have an angle of inclination ⁇ with respect to the end face 8, which contains the outlet openings of the flow channels.
  • a conventional vertical flow channel is shown in dashed lines in the right half of FIG. 4 for comparison. If one assumes that when the gas blowing is interrupted, the metal melt penetrates a distance x into the channel and solidifies there, it can be seen that the depth of penetration, measured as a vertical distance from the end face (8), in the inventive flow channel 7 'only x ⁇ Sin ⁇ and is therefore less than the penetration depth x in the conventional vertical flow channel. If the end face 8 is subjected to heat again and the gas blowing is resumed, the penetrated metal can be used in the invention Flow channel can be melted and blown out more easily than with the conventional flow channel.
  • the frustoconical gas distribution chamber extends over about a third of the stone height, for example 80 to 100 mm, and is filled with a gas-permeable body 5 'made of porous refractory material. This creates an optical residual strength indicator for the point in time when the sink needs to be replaced. As soon as the sink is worn down to the gas-permeable body 5 ', the body 5' is visible on the hot side.
  • the flow channels 7 are arranged helically around support bodies 10, which are embedded in the refractory molded body 1.
  • These support bodies 10 are expediently frustoconical and, like the body 5 'used for gas distribution, can consist of a porous refractory material produced by the process of AT-B-374 164. If the support bodies 10 are gas-permeable, they offer additional options for the gas passage.
  • the helical or spiral flow channels 7 extend over the entire height of the support body (10); in the drawing, however, they are only indicated in the upper area because of the simpler representation.
  • the gas distribution chamber 9 can be sealed against the refractory molded body 1 by a metal housing and the metal tubes welded gas-tight to the metal housing, thereby preventing the refractory molded body 1 from being exposed to the purge gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Treating Waste Gases (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Continuous Casting (AREA)
  • Materials For Medical Uses (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Incineration Of Waste (AREA)
  • Sampling And Sample Adjustment (AREA)

Claims (6)

1. Brique de brassage au gaz pour des récipients métallurgiques pour introduire un gaz de brassage provoquant une action de malaxage dans le métal en fusion, contenant un moule réfractaire avec des canaux d'écoulement continus, caractérisée en ce que les canaux d'écoulement (7) sont placés, au moins dans la partie voisine de leurs orifices de sortie, fortement inclinés par rapport à la direction de l'axe longitudinal de la brique de brassage, l'angle d'inclinaison (α) entre les canaux d'écoulement (7) et la surface frontale (8) de la brique de brassage contenant les orifices de sortie des canaux d'écoulement (7) étant compris entre 15° et 60°, de préférence entre 20° et 50°.
2. Brique de brassage au gaz selon la revendication 1, caractérisée en ce que les canaux d'écoulement (7) sont formés de façon hélicoïdale, ondulée ou en zigzag.
3. Brique de brassage au gaz selon les revendications 1 ou 2, caractérisée en ce que la formation inclinée, en particulier hélicoïdale, ondulée ou en zigzag, des canaux d'écoulement (7) atteint à environ deux tiers de la hauteur de la brique vu de la surface frontale (8) de la brique contenant les orifices de sortie des canaux d'écoulement (7).
4. Brique de brassage au gaz selon une des revendications 1 à 3, caractérisée en ce que les canaux d'écoulement (7) ont la même position inclinée dans chaque coupe de la brique en disposition symétrique de rotation.
5. Brique de brassage au gaz selon une des revendications 1 à 4, caractérisée en ce que les canaux d'écoulement (7) sont placés de façon hélicoïdale autour des moules d'appui (10), de préférence en matériau réfractaire perméable au gaz, qui sont insérés dans le moule réfractaire (1).
6. Brique de brassage au gaz selon une des revendications 1 à 5, caractérisée en ce que les canaux d'écoulement (7) partent d'une chambre de distribution de gaz (9) placée sur le côté froid du moule réfractaire (1) et remplie avec un moule perméable au gaz (5, 5′) en matériau réfractaire poreux.
EP89890042A 1988-02-19 1989-02-17 Brique de brassage au gaz Expired - Lifetime EP0329645B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT404/88 1988-02-19
AT40488 1988-02-19

Publications (2)

Publication Number Publication Date
EP0329645A1 EP0329645A1 (fr) 1989-08-23
EP0329645B1 true EP0329645B1 (fr) 1991-04-24

Family

ID=3489722

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89890042A Expired - Lifetime EP0329645B1 (fr) 1988-02-19 1989-02-17 Brique de brassage au gaz
EP89902368A Pending EP0356483A1 (fr) 1988-02-19 1989-02-17 Bloc permeable aux gaz pour operations metallurgiques

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89902368A Pending EP0356483A1 (fr) 1988-02-19 1989-02-17 Bloc permeable aux gaz pour operations metallurgiques

Country Status (10)

Country Link
EP (2) EP0329645B1 (fr)
KR (1) KR900700638A (fr)
AT (1) ATE62937T1 (fr)
AU (1) AU610697B2 (fr)
DE (1) DE58900091D1 (fr)
ES (1) ES2021894B3 (fr)
HU (1) HU891288D0 (fr)
IN (1) IN170797B (fr)
WO (1) WO1989007659A1 (fr)
ZA (1) ZA891290B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4419811C1 (de) * 1994-06-07 1995-04-27 Plibrico Gmbh Gasspülstein mit Verschleißanzeige
DE19701806A1 (de) * 1997-01-21 1998-07-23 Didier Werke Ag Verwendung eines Drahtgeflechtes

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE470009B (sv) * 1991-03-04 1993-10-25 Stiftelsen Metallurg Forsk Förfarande och anordning för gasspolning av metallsmälta i en behållare
DE9103595U1 (de) * 1991-03-23 1991-07-04 Martin & Pagenstecher GmbH, 5000 Köln Einblasvorrichtung für ein metallurgisches Gefäß
WO1995033587A1 (fr) * 1994-06-08 1995-12-14 Veitsch-Radex Aktiengesellschaft Für Feuerfeste Erzeugnisse Dispositif de rincage par les gaz pour cuve metallurgique, notamment un convertisseur d'acierie
FR2739312B1 (fr) * 1995-09-28 1997-10-31 Lorraine Laminage Element poreux destine a l'affinage d'un metal liquide dans un recipient metallurgique
DE19619204C1 (de) * 1996-05-11 1997-05-22 Veitsch Radex Ag Gasspüleinrichtung
FR2758486B1 (fr) * 1997-01-23 1999-03-26 Savoie Refractaires Dispositif perfectionne d'insufflation d'un gaz dans un metal en fusion
DE19750046A1 (de) * 1997-11-12 1999-05-20 Wilhelm Gerhard Venn Gasspülstein mit spiralförmigem Gaskanal
JP3126122B1 (ja) * 1999-08-19 2001-01-22 東京窯業株式会社 ガス吹き込み用プラグ及びその製作方法
ES2292008T3 (es) * 2005-06-21 2008-03-01 REFRACTORY INTELLECTUAL PROPERTY GMBH & CO. KG Barra de obturador.
DE102005029033B4 (de) * 2005-06-21 2007-10-11 Refractory Intellectual Property Gmbh & Co. Kg Verschlussstopfen für ein metallurgisches Schmelzgefäß
DE102006031687B4 (de) * 2006-07-08 2008-08-14 Refractory Intellectual Property Gmbh & Co. Kg Element
PL2711107T3 (pl) * 2012-09-20 2015-02-27 Refractory Intellectual Property Gmbh & Co Kg Ogniotrwała ceramiczna kształtka do przedmuchiwania gazem i sposób wytwarzania takiej kształtki do przedmuchiwania gazem
UA126511C2 (uk) * 2020-10-05 2022-10-19 Товариство З Обмеженою Відповідальністю "Іннотех-Сплав" Спосіб обробляння рідкого металу газовим середовищем в металургійній ємності та пристрій для його здійснення

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1543169A (fr) * 1964-02-06 1900-01-01 Buse à tubes capillaires
FR2455008A1 (fr) * 1979-04-25 1980-11-21 Siderurgie Fse Inst Rech Piece refractaire a permeabilite selective et orientee pour l'insufflation d'un fluide
FR2516938B1 (fr) * 1981-11-23 1986-06-06 Usinor Dispositif pour l'introduction de gaz dans le bain de metal liquide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4419811C1 (de) * 1994-06-07 1995-04-27 Plibrico Gmbh Gasspülstein mit Verschleißanzeige
DE19701806A1 (de) * 1997-01-21 1998-07-23 Didier Werke Ag Verwendung eines Drahtgeflechtes
DE19701806C2 (de) * 1997-01-21 1998-11-19 Didier Werke Ag Verwendung eines Drahtgeflechtes

Also Published As

Publication number Publication date
DE58900091D1 (de) 1991-05-29
ES2021894B3 (es) 1991-11-16
KR900700638A (ko) 1990-08-16
ZA891290B (en) 1991-10-30
WO1989007659A1 (fr) 1989-08-24
EP0356483A1 (fr) 1990-03-07
AU3061989A (en) 1989-09-06
IN170797B (fr) 1992-05-23
HU891288D0 (en) 1990-03-28
AU610697B2 (en) 1991-05-23
EP0329645A1 (fr) 1989-08-23
ATE62937T1 (de) 1991-05-15

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