EP0576212B1 - Purification de métal fondu - Google Patents

Purification de métal fondu Download PDF

Info

Publication number
EP0576212B1
EP0576212B1 EP19930304736 EP93304736A EP0576212B1 EP 0576212 B1 EP0576212 B1 EP 0576212B1 EP 19930304736 EP19930304736 EP 19930304736 EP 93304736 A EP93304736 A EP 93304736A EP 0576212 B1 EP0576212 B1 EP 0576212B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
gas
nozzle block
receiving channel
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
EP19930304736
Other languages
German (de)
English (en)
Other versions
EP0576212A2 (fr
EP0576212A3 (fr
Inventor
Liam Cullen
Michael Robert Clark
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.)
Foseco International Ltd
Original Assignee
Foseco International Ltd
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 Foseco International Ltd filed Critical Foseco International Ltd
Publication of EP0576212A2 publication Critical patent/EP0576212A2/fr
Publication of EP0576212A3 publication Critical patent/EP0576212A3/fr
Application granted granted Critical
Publication of EP0576212B1 publication Critical patent/EP0576212B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • This invention relates to a means for the purification of molten metal, i.e. the removal of unwanted solid non-metallic inclusions contained in the molten metal.
  • EP-A-404641 discloses the use in a tundish of a gas duct set into the permanent refractory lining and leading to a gas distribution chamber in the bottom of, and extending across, the tundish, the chamber being covered with a gas-permeable plate.
  • GB-A-2164281 discloses the use of a porous refractory tile extending across the width of, and sitting on the floor of, a tundish, the tile containing a gas conduit with a plurality of exits to deliver gas into the tile.
  • EP-A-0239257 discloses passing steel in a tundish through an apertured upright board, while introducing an inert gas at the foot of the board at its upstream side to cause a stream of bubbles to flow over its upstream side.
  • EP-A-0059805 discloses the use of a porous nozzle in the bottom of a molten metal vessel, the nozzle having a flanged upper portion and cylindrical lower portion, its body being enclosed in a gas tight steel shell, with means to provide gas into the porous nozzle to escape into the molten metal in the vessel.
  • FR-A-2516415 also discloses the use of a porous flanged nozzle in the bottom of a molten metal vessel.
  • the annular flange contains a pipe extending around the flange and gas supplied to the pipe escapes through holes in the pipe and up through the porous flange into the molten metal.
  • the present invention aims to provide an improved means of bubbling gas into molten metal in the region of a nozzle in the bottom of a molten metal vessel.
  • a molten metal vessel such as a tundish used in the continuous casting of steel
  • the vessel will normally be of metal, usually steel, lined with refractory material, e.g. brick or a cast refractory concrete.
  • Each outlet is provided by a nozzle positioned in a correspondingly-shaped hole through the floor of the lined vessel. It is conventional practice not to set the nozzle directly into the vessel lining but to set it into a so-called nozzle block, which latter is set into the vessel lining.
  • the invention provides a refractory-lined vessel to contain molten metal, the vessel having an outlet through its floor and comprising a nozzle with a centrally-disposed through bore, the nozzle being sealingly set in a nozzle block which is itself sealingly set in the lining of the floor of the vessel whereby the outlet is defined, a gas-receiving channel extending around the nozzle and means to connect the gas-receiving channel to a source of gas, characterised in that the nozzle block is formed of gas-permeable material and in that the gas-receiving channel is located in the nozzle block so that it surrounds and is spaced from the nozzle.
  • the invention provides a nozzle block shaped to be sealingly set in the refractory lining of the floor of a vessel to contain molten metal, the nozzle block having a through bore to align with a hole through the lining and the floor of the vessel, and being shaped to lie on the floor without protruding through the hole and to contain a nozzle with a centrally-disposed through bore whereby the nozzle can extend through the hole to the exterior of the vessel, characterised in that the nozzle block is gas-permeable and has a gas-receiving channel located to extend around and be spaced from the nozzle and means to connect the gas-receiving channel to a source of gas.
  • the gas-receiving channel extends completely around the nozzle.
  • Gas, e.g. argon, supplied to the channel escapes upwardly through the porous nozzle block and emerges into the molten metal in the vessel in streams of bubbles rising from the vessel floor around the nozzle.
  • the gas-receiving channel preferably contains a pipe connected to the source of gas, the pipe having perforations or slots, preferably in its upper surface, to allow escape of the gas into the porous nozzle block.
  • the nozzle block may be a shaped refractory brick containing a centrally-disposed hole shaped to receive the nozzle but preferably it is made of a cast refractory cement into which the nozzle is set.
  • the refractory cement may be of any suitable composition, well known per se in the art, but formulated to have the desired degree of porosity.
  • the nozzle block may be designed to have greater porosity above the gas-receiving channel and lesser, e.g. approaching zero, porosity below the gas-receiving channel so as to help to direct the emerging gas upwardly into the molten metal.
  • the porous refractory composition may be, for example, of a high alumina content formulation containing alumina and cement.
  • the alumina content should be at least 65% by weight of the composition, preferably at least 75% and especially in the range 90 to 97% by weight.
  • an area of different composition or porosity e.g. corresponding to the above-described area of lesser porosity, this may also be a cheaper formulation and hence, contain less of the better refractory component, i.e. alumina.
  • part of the alumina may be replaced by an ore such as andalusite and/or bauxite.
  • the construction of the present invention is particularly useful in that it can provide inert gas scouring in the immediate vicinity of the nozzle which, in a tundish, can prevent unwanted build up of deposits such as alumina on the nozzle itself while, moreover, it provides streams of inert gas in a wider region surrounding the nozzle to give, thereby, very effective inclusion-removal in the vessel itself.
  • the metal tundish 10 has a base 11 and sidewalls 12, one only of the latter being shown. It is lined with a permanent refractory lining 13 which is itself covered with an inner, i.e. molten metal-contacting, expendable lining 14. An outlet 15 is provided in the base 11. This can be opened and closed by any conventional means (not shown), for example, by a stopper rod or a slide-gate valve beneath the base.
  • a nozzle block 16 of cast refractory cement is positioned in a suitably-shaped recess in the tundish lining so as to rest on the base 11 surrounding the outlet 15.
  • a nozzle 17 sits in the nozzle block so that its lower portion 17A protrudes below the base 11 of the tundish.
  • Nozzle block 16 is of gas-permeable formulation and contains a feed pipe 18 to receive gas from a source (not shown). Feed pipe 18 runs completely around the interior of the nozzle block so as to surround the nozzle 17. The pipe 18 is conveniently set into the nozzle block as it is cast. The pipe is perforated in the manner indicated above so as to allow gas to escape into the nozzle block 16 and thereby into the interior of the tundish.
  • Escaping gas is indicated by arrows A and B.
  • the upper surface of nozzle block 16 has a horizontal portion 19, which is set above the level of the upper surface 21 of the nozzle 17, and an angled surface 20 which slopes down to the level of the nozzle surface 21.
  • Gas stream A escapes from horizontal surface 19 and rises vertically to capture inclusions in the molten metal contained in the tundish.
  • Gas stream B escapes upwardly and inwardly over the upper surface 21 of nozzle 17 and thereby helps to scour the nozzle of alumina or other deposits that would otherwise form on the nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (20)

  1. Cuve à revêtement réfractaire (10) pour contenir du métal fondu, la cuve ayant une sortie (15) traversant son fond (11) et comprenant une buse (17) avec un alésage traversant disposé centralement, la buse (17) étant placée de manière étanche dans un porte-buse (16), qui est lui-même placé de manière étache dans le revêtement (13, 14) du fond (11) de la cuve (10), la sortie (15) étant ainsi définie, un canal (18) de réception de gaz s'étendant autour de la buse (17) et un moyen pour relier le canal de réception de gaz à une source de gaz, caractérisée en ce que le porte-buse (16) est formé d'une matière perméable au gaz et en ce que le canal (18) de réception de gaz est situé dans le porte-buse (16) de sorte qu'il entoure la buse (17) et en soit sépare.
  2. Cuve à revêtement réfractaire selon la revendication 1, dans laquelle le canal (18) de réception de gaz s'étend complètement autour de la buse (17).
  3. Cuve à revêtement réfractaire selon la revendication 1 ou 2, dans laquelle le canal (18) de réception de gaz contient un tuyau (18) dont la surface supérieure présente des perforations.
  4. Cuve à revêtement réfractaire selon la revendication 1, 2 ou 3, dans laquelle le porte-buse (16) est une brique réfractaire façonnée ayant un alésage disposé centralement pour recevoir la buse (17).
  5. Cuve à revêtement réfractaire selon la revendication 1, 2 ou 3, dans laquelle le porte-buse (16) est en ciment coulé réfractaire dans lequel est placée la buse (17).
  6. Cuve à revêtement réfractaire selon l'une quelconque des revendications précédentes, dans laquelle le porte-buse (16) présente une porosité plus importante au-dessus du canal (18) de réception de gaz qu'en dessous de celui-ci.
  7. Cuve à revêtement réfractaire selon la revendication 6, dans laquelle le porte-buse (16) est essentiellement non poreux en dessous du canal (18) de réception de gaz.
  8. Cuve à revêtement réfractaire selon l'une quelconque des revendications précédentes, dans laquelle la composition du porte-buse (16) comprend au moins 75% en poids d'alumine.
  9. Cuve à revêtement réfractaire selon la revendication 8, dans laquelle la composition du porte-buse (16) comprend de 90 à 97% en poids d'alumine.
  10. Cuve à revêtement réfractaire selon la revendication 6, 7 ou 8, dans laquelle le porte-buse (16) comprend une composition d'au moins 75% en poids d'alumine au-dessus du canal (18) de réception de gaz, et une composition contenant moins d'alumine en dessous du canal (18) de réception de gaz.
  11. Porte-buse (16) destiné à être placé de manière étanche dans le revêtement réfractaire (13, 14) du fond (11) d'une cuve (10) pour contenir du métal fondu, le porte-buse (16) ayant un alésage traversant à aligner avec un trou traversant le revêtement et le fond de la cuve, et étant façonné de manière à reposer sur le fond (11) sans faire saillie à travers le trou et à contenir une buse (17) avec un alésage traversant (15) disposé centralement, la buse (17) pouvant ainsi s'étendre à travers le trou jusqu'à l'extérieur de la cuve (10), caractérisé en ce que le porte-buse (16) est perméable au gaz et présente un canal (18) de réception de gaz situé de manière à s'étendre autour de la buse (17) et à en être séparé, et un moyen pour relier le canal (18) de réception de gaz à une source de gaz.
  12. Porte-buse selon la revendication 11, dans lequel le canal (18) de réception de gaz s'étend entièrement autour de la buse (17).
  13. Porte-buse selon la revendication 11 ou 12, dans lequel le canal de réception de gaz contient un tuyau (18) dont la surface supérieure présente des perforations.
  14. Porte-buse selon la revendication 11, 12 ou 13, dans lequel le porte-buse (16) est une brique réfractaire façonnée ayant un alésage disposé centralement pour recevoir la buse (17).
  15. Porte-buse selon la revendication 11, 12 ou 13, dans lequel le porte-buse (16) est en ciment coulé réfractaire dans lequel est placée la buse (17).
  16. Porte-buse selon l'une quelconque des revendications 11 à 15, dans lequel le porte-buse (16) présente une porosité plus importante au-dessus du canal (18) de réception de gaz qu'en dessous de celui-ci.
  17. Porte-buse selon la revendication 16, dans lequel le porte-buse (16) est essentiellement non poreux en dessous du canal (18) de réception de gaz.
  18. Porte-buse selon l'une quelconque des revendications 11 à 17, dans lequel la composition du porte-buse (16) comprend au moins 75% en poids d'alumine.
  19. Porte-buse selon la revendication 18, dans lequel la composition du porte-buse (16) comprend de 90 à 97% en poids d'alumine.
  20. Porte-buse selon la revendication 16, 17 ou 18, dans lequel le porte-buse (16) comprend une composition d'au moins 75% en poids d'alumine au-dessus du canal (18) de réception de gaz, et une composition contenant moins d'alumine en dessous du canal (18) de réception de gaz.
EP19930304736 1992-06-18 1993-06-17 Purification de métal fondu Expired - Lifetime EP0576212B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9212953 1992-06-18
GB929212953A GB9212953D0 (en) 1992-06-18 1992-06-18 Purifying molten metal

Publications (3)

Publication Number Publication Date
EP0576212A2 EP0576212A2 (fr) 1993-12-29
EP0576212A3 EP0576212A3 (fr) 1994-11-23
EP0576212B1 true EP0576212B1 (fr) 1999-04-14

Family

ID=10717326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930304736 Expired - Lifetime EP0576212B1 (fr) 1992-06-18 1993-06-17 Purification de métal fondu

Country Status (4)

Country Link
EP (1) EP0576212B1 (fr)
DE (1) DE69324408T2 (fr)
ES (1) ES2132188T3 (fr)
GB (2) GB9212953D0 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19520897C1 (de) * 1995-06-01 1996-10-31 Mannesmann Ag Strangguß-Verteilerrinne
US5723055A (en) * 1995-10-10 1998-03-03 Vesuvius Crucible Company Nozzle assembly having inert gas distributor
GB9903937D0 (en) * 1999-02-22 1999-04-14 Foseco Int Tundish impact pad
EP1243361A1 (fr) * 2001-03-19 2002-09-25 Vesuvius Crucible Company Dispositif pour introduire un gaz dans un métal liquide
TW200420371A (en) * 2002-10-16 2004-10-16 Vesuvius Crucible Co Resin-bonded, gas purged nozzle
EA011370B1 (ru) * 2007-08-17 2009-02-27 Общество С Ограниченной Ответственностью "Тмт" Устройство для рафинирования металла в промежуточном ковше
DE102008015323A1 (de) * 2008-03-20 2009-10-01 Raadts, Monika Verteilervorrichtung für Strangguss
KR100986053B1 (ko) 2008-09-23 2010-10-08 조선내화 주식회사 용강 주조용 웰블럭
CL2010000833A1 (es) * 2010-08-05 2010-12-03 Bezanilla Y Cia Ltda Mecanismo automatizado de sangría de metal fundido de hornos de fusión y conversión, con un bloque refractario intercalado en una pared con orificio cónico pasante, una válvula de guillotina y un ensamble de cono refractario que posee una perforación interior, y un sistema de canalización e inyección de gas; proceso asociado.
JP2021049564A (ja) * 2019-09-26 2021-04-01 黒崎播磨株式会社 タンディッシュ上ノズル構造体及び連続鋳造方法
CN111774560B (zh) * 2020-07-25 2022-03-11 莱芜钢铁集团银山型钢有限公司 一种lf精炼钢包微孔陶瓷棒透气上水口座砖及其吹氩控制方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1493880A (en) * 1975-03-08 1977-11-30 Flogates Ltd Pouring of metals
GB1601944A (en) * 1978-03-14 1981-11-04 Glocast Products Ltd Well blocks for ladles
FR2516415A1 (fr) * 1981-11-13 1983-05-20 Daussan & Co Dispositif pour eliminer les inclusions contenues dans les metaux liquides
JPS59211522A (ja) * 1983-05-13 1984-11-30 Harima Refract Co Ltd ポーラスプラグの製造方法
GB2149699B (en) * 1983-11-18 1987-03-11 Uss Eng & Consult Method and apparatus for avoiding vortexing in a bottom pour vessel
GB2164281A (en) * 1984-09-18 1986-03-19 Dresser Ind Tundish with gas injection tile
CH657075A5 (de) * 1984-11-26 1986-08-15 Cometus Ag Verfahren zum spuelen von metallschmelzen, mit einem durch einen spuelstein gefuehrten gas, und spuelstein zur ausfuehrung des verfahrens.
GB8703717D0 (en) * 1987-02-18 1987-03-25 Injectall Ltd Injecting gas into metal melts
IN168760B (fr) * 1987-04-10 1991-06-01 Injectall Ltd
SE8702601L (sv) * 1987-06-23 1988-12-24 Hoeganaes Ab Metallurgisk dysa
DE4012952C2 (de) * 1990-04-24 1995-03-23 Didier Werke Ag Gasspüleinrichtung an einem metallurgischen Gefäß
JPH0510443U (ja) * 1991-07-29 1993-02-09 東京窯業株式会社 ガス吹き込み用プラグ

Also Published As

Publication number Publication date
GB2267855A (en) 1993-12-22
DE69324408D1 (de) 1999-05-20
GB2267855B (en) 1995-09-20
GB9212953D0 (en) 1992-07-29
EP0576212A2 (fr) 1993-12-29
EP0576212A3 (fr) 1994-11-23
DE69324408T2 (de) 1999-12-16
ES2132188T3 (es) 1999-08-16
GB9312074D0 (en) 1993-07-28

Similar Documents

Publication Publication Date Title
EP0576212B1 (fr) Purification de métal fondu
KR0170045B1 (ko) 와류억제용 유동조절장치
CA1285773C (fr) Affinage de l'acier
EP0030220B1 (fr) Procédé pour introduire des additifs solides dans un métal en fusion
EP0714330A1 (fr) Purification de metal fondu
WO1993000190A1 (fr) Appareil destine a retenir les scories pendant que le metal fondu est decharge du panier de coulee
US5723055A (en) Nozzle assembly having inert gas distributor
EP0306751B1 (fr) Procédé de coulée pour machine de coulée continue à hauteur et busette de coulée immergée consécutive
US4619443A (en) Gas distributing tundish barrier
US20020011696A1 (en) Tundish impact pad
GB2066438A (en) Method and apparatus for separating slag and pouring molten steel out of a container such as a converter or the like
US4919188A (en) Mould and process for the production of nodular or compacted graphite iron castings
US4995592A (en) Purifying molten metal
GB2149699A (en) Method and apparatus for avoiding vortexing in a bottom pour vessel
EP0081303B1 (fr) Appareil pour la protection de métal liquide pendant la coulée
RU2092271C1 (ru) Способ поточного вакуумирования стали при непрерывной разливке и устройство для его осуществления
JP2976848B2 (ja) タンディッシュ内溶鋼の高清浄化方法
RU95117221A (ru) Способ поточного вакуумирования стали при непрерывной разливке и устройство для его осуществления
Cullen et al. Purifying Molten Metal Using a Nozzle Block Having a Gas Receiving Channel
KR20020016818A (ko) 용해로 및 주입래들용 배출채널
RU2086354C1 (ru) Разливочный ковш
JP3558815B2 (ja) 底部を密閉した固定堰を備えたタンディッシュによる高清浄度鋼連続鋳造方法
JPS5917482Y2 (ja) 連続鋳造鋳片内の非金属介在物減少装置
JPS571548A (en) Ingate for molten metal vessel
RU2229360C2 (ru) Устройство для рафинирования стали от неметаллических включений

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR IT

17P Request for examination filed

Effective date: 19950202

17Q First examination report despatched

Effective date: 19950315

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR IT

REF Corresponds to:

Ref document number: 69324408

Country of ref document: DE

Date of ref document: 19990520

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2132188

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20010511

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010523

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20010607

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020618

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20030711

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050617