EP0576212A2 - Reinigen von geschmolzenem Metall - Google Patents

Reinigen von geschmolzenem Metall Download PDF

Info

Publication number
EP0576212A2
EP0576212A2 EP93304736A EP93304736A EP0576212A2 EP 0576212 A2 EP0576212 A2 EP 0576212A2 EP 93304736 A EP93304736 A EP 93304736A EP 93304736 A EP93304736 A EP 93304736A EP 0576212 A2 EP0576212 A2 EP 0576212A2
Authority
EP
European Patent Office
Prior art keywords
gas
nozzle
nozzle block
refractory
receiving channel
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
EP93304736A
Other languages
English (en)
French (fr)
Other versions
EP0576212A3 (de
EP0576212B1 (de
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/de
Publication of EP0576212A3 publication Critical patent/EP0576212A3/de
Application granted granted Critical
Publication of EP0576212B1 publication Critical patent/EP0576212B1/de
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.
  • 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 though 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 means of supplying gas into a refractory-lined vessel containing molten metal in which an outlet through the floor of the vessel comprises 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, the nozzle block being gas-permeable and having a gas-receiving channel extending around 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)
EP19930304736 1992-06-18 1993-06-17 Reinigen von geschmolzenem Metall Expired - Lifetime EP0576212B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=10717326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930304736 Expired - Lifetime EP0576212B1 (de) 1992-06-18 1993-06-17 Reinigen von geschmolzenem Metall

Country Status (4)

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

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5723055A (en) * 1995-10-10 1998-03-03 Vesuvius Crucible Company Nozzle assembly having inert gas distributor
WO2000050190A1 (en) * 1999-02-22 2000-08-31 Foseco International Limited Tundish impact pad
WO2004035249A1 (en) * 2002-10-16 2004-04-29 Vesuvius Crucible Company Permeable refractory material for a gas purged nozzle
EP2025431A1 (de) * 2007-08-17 2009-02-18 LLC "TMT" Peresechenie Logoiskiy tr&MKAD Vorrichtung zur Metallverfeinerung im Zwischengefäß
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
JP2023515903A (ja) * 2020-07-25 2023-04-14 莱蕪鋼鉄集団銀山型鋼有限公司 Ｌｆ精錬用取鍋の微多孔質セラミック棒付き通気性上ノズル受けレンガ、及びそのアルゴンガス吹き制御方法

Families Citing this family (4)

* 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
EP1243361A1 (de) * 2001-03-19 2002-09-25 Vesuvius Crucible Company Vorrichtung zum Einleiten von Gasen in eine Metallschmelze
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

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
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
GB2149699A (en) * 1983-11-18 1985-06-19 Uss Eng & Consult Method and apparatus for avoiding vortexing in a bottom pour vessel
EP0187924A1 (de) * 1984-11-26 1986-07-23 Cometus AG Verfahren zum Spülen von Metallschmelze und Pfanne zur Durchführung des Verfahrens

Family Cites Families (7)

* 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
GB2164281A (en) * 1984-09-18 1986-03-19 Dresser Ind Tundish with gas injection tile
GB8703717D0 (en) * 1987-02-18 1987-03-25 Injectall Ltd Injecting gas into metal melts
IN168760B (de) * 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

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
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
GB2149699A (en) * 1983-11-18 1985-06-19 Uss Eng & Consult Method and apparatus for avoiding vortexing in a bottom pour vessel
EP0187924A1 (de) * 1984-11-26 1986-07-23 Cometus AG Verfahren zum Spülen von Metallschmelze und Pfanne zur Durchführung des Verfahrens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent Publications Ltd., London, GB; AN 85-015337 & JP-A-59 211 522 (HARIMA TAIKA RENGA) 30 November 1984 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5723055A (en) * 1995-10-10 1998-03-03 Vesuvius Crucible Company Nozzle assembly having inert gas distributor
WO2000050190A1 (en) * 1999-02-22 2000-08-31 Foseco International Limited Tundish impact pad
WO2004035249A1 (en) * 2002-10-16 2004-04-29 Vesuvius Crucible Company Permeable refractory material for a gas purged nozzle
EP2025431A1 (de) * 2007-08-17 2009-02-18 LLC "TMT" Peresechenie Logoiskiy tr&MKAD Vorrichtung zur Metallverfeinerung im Zwischengefäß
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
JP2023515903A (ja) * 2020-07-25 2023-04-14 莱蕪鋼鉄集団銀山型鋼有限公司 Ｌｆ精錬用取鍋の微多孔質セラミック棒付き通気性上ノズル受けレンガ、及びそのアルゴンガス吹き制御方法
JP7299430B2 (ja) 2020-07-25 2023-06-27 莱蕪鋼鉄集団銀山型鋼有限公司 Ｌｆ精錬用取鍋の微多孔質セラミック棒付き通気性上ノズル受けレンガ、及びそのアルゴンガス吹き制御方法

Also Published As

Publication number Publication date
DE69324408D1 (de) 1999-05-20
GB2267855A (en) 1993-12-22
EP0576212A3 (de) 1994-11-23
DE69324408T2 (de) 1999-12-16
EP0576212B1 (de) 1999-04-14
GB9212953D0 (en) 1992-07-29
GB9312074D0 (en) 1993-07-28
ES2132188T3 (es) 1999-08-16
GB2267855B (en) 1995-09-20

Similar Documents

Publication Publication Date Title
EP0576212B1 (de) Reinigen von geschmolzenem Metall
CA1285773C (en) Purifying steel
KR0170045B1 (ko) 와류억제용 유동조절장치
EP0030220B1 (de) Verfahren zum Einbringen fester Zuschläge in eine Metallschmelze
AU7234994A (en) Purifying molten metal
EP0306751B1 (de) Giessverfahren für eine Stranggiessvorrichtung mit reduzierter Bauhöhe und entsprechender Tauchausguss
WO1993000190A1 (en) Apparatus for retaining slag during the discharge of molten metal from a tundish
US4619443A (en) Gas distributing tundish barrier
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
US20020011696A1 (en) Tundish impact pad
EP0376523A1 (de) Reinigen von geschmolzenem Metall
GB2149699A (en) Method and apparatus for avoiding vortexing in a bottom pour vessel
EP0081303B1 (de) Einrichtung für das Abschirmen von geschmolzenem Metall während des Giessens
RU2092271C1 (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
RU2086354C1 (ru) Разливочный ковш
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
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
JPS571548A (en) Ingate for molten metal vessel
JPS61111748A (ja) 溶融金属容器における気泡の微細化および分散方法
RU2092273C1 (ru) Способ поточного вакуумирования стали при непрерывной разливке
Rothfuss et al. Gas Flushing Apparatus for Metallurgical Vessel
JPH08112651A (ja) 鋼の連続鋳造方法

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