EP0242155A1 - Einblassdüse bei einem Schmelze enthaltenden Behälter - Google Patents

Einblassdüse bei einem Schmelze enthaltenden Behälter Download PDF

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Publication number
EP0242155A1
EP0242155A1 EP87303199A EP87303199A EP0242155A1 EP 0242155 A1 EP0242155 A1 EP 0242155A1 EP 87303199 A EP87303199 A EP 87303199A EP 87303199 A EP87303199 A EP 87303199A EP 0242155 A1 EP0242155 A1 EP 0242155A1
Authority
EP
European Patent Office
Prior art keywords
blocks
block
refractory
pipes
vessel
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.)
Withdrawn
Application number
EP87303199A
Other languages
English (en)
French (fr)
Inventor
Adrian Stanton Normanton
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.)
British Steel PLC
Original Assignee
British Steel Corp
British Steel PLC
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 British Steel Corp, British Steel PLC filed Critical British Steel Corp
Publication of EP0242155A1 publication Critical patent/EP0242155A1/de
Withdrawn legal-status Critical Current

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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
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath

Definitions

  • This invention relates to gas injection elements for melt containing vessels, and particularly although not exclusively relates to gas-permeable elements mountable in the base or side walls of metallurgical vessels having a refractory material lining.
  • metalurgical vessel is particularly intended to comprise a steel converter vessel or arc furnace, it also includes within its scope ladles for use in steel production, and indeed melt containing treatment vessels for non-ferrous metals.
  • such a gas-permeable element for gas injection may comprise a refractory block, or a collection of refractory blocks having slots or holes cut, formed or provided therein.
  • the arrangement in such cases is such that the refractory block or collection of blocks is mounted in the refractory lining of the vessel and connects through the base or side wall thereof with the slots or holes connected from outside the vessel through to the space within the vessel.
  • a gas conduit from outside enables gas to be passed into the vessel so that a stirring or processing gas can be injected into a melt in the vessel.
  • such gases usually are of a stirring nature to assist the conversion reactions.
  • refractory blocks A disadvantage of such refractory blocks is that it is difficult to produce the blocks with accurately formed holes or slots necessary for even and controllable gas injection.
  • slotted or holed blocks from the nature of refractories, have a significant surface roughness factor within the holes or slots through which the gas passes, so that there is a significant pressure drop along the length of the injection element, leading to the need to utilise relatively high gas injection pressure.
  • Such refractory blocks may be contained in a metal casing enclosing the sides of the block or blocks, however, such encasings are susceptible to oxidation and melting in use, particularly at the inner end thereof.
  • metal pipes extending through the blocks of small diameter and used either spaced around or through the ceramic blocks have been proposed as a single injection source.
  • Such metal pipes are prone to metal wetting leading to blockage problems, the formation of knurdles, unless operated at sonic gas flows, and to oxidation.
  • the oxidation of such pipes renders them subject to very rapid wear of several millimeters per charge.
  • the Knurdle formation is often brought about because of local excessive cooling due to the high conductivity of the metal pipes.
  • Such formation of knurdles can in some circumstances close the pipes or at least impede the desired through-flow of gas.
  • With large diameter pipes it is also necessary to ensure that an adequate quantity of gas is blown through them at all times whenever a melt is in the vessel to prevent the melt flowing away through the pipes.
  • a gas injection element for use in the side or base wall of a refractory lined melt containing vessel, comprising at least one refractory block arranged in use to extend lengthwise through the vessel lining into the internal cavity thereof wherein a plurality of ceramic pipes pass through bores in the refractory block along the length thereof.
  • One end of the refractory block or blocks may be provided with a metal manifold box comprising a surrounding open topped container within which the block or blocks are seated and having means for separating the refractory block or blocks from the base of the container and having a gas injection conduit connected thereto.
  • gas for injection will enter the manifold box and then pass in parallel through the plurality of ceramic pipes.
  • the means for separating the block or blocks from the base of the container may be refractory or metal spacer members.
  • the refractory block or blocks may taper inwardly from the manifold box, so that in use it tapers towards the internal cavity of the melt vessel.
  • the ceramic pipes may be spaced across the block or blocks, or may be spaced around the outer periphery thereof.
  • a total of between 15 and 25 ceramic pipes may be set around the edge of a refractory block.
  • the block or blocks may be of generally rectangular section, and the pipes may be disposed along at least one edge of the block or blocks. Where a plurality of blocks are used the pipes may be disposed between at least two of the blocks.
  • the pipes may be of any convenient cross section. Thus they may be circular or oval in section, or may for example be in the form of an elongate slot in section.
  • the invention includes within its scope a melt containing vessel incorporating an insert member according to the invention.
  • the invention also includes within its scope a method of refining metal incorporating gas blown through an insert member according to the invention.
  • the gas injection element comprises a refractory block 1 of generally square section tapering from a gas injection end 2 to an outlet surface 3.
  • the block may be 800mm long, and have an outlet face 145mm by 99mm.
  • the block may be formed of magnesia and carbon, possibly with anti-oxidant additions such as aluminium or silicon or magnesium or mixtures thereof, or may be a phosphate bonded castable magnesia.
  • the block is arranged in use to be seated within the lower wall of a steel converter vessel (not shown) with the outlet surface 3 generally in line with the inner wall of the lining of the vessel and extending at its inlet end 2 towards the outer side of the converter vessel.
  • FIG. 2 most clearly a plurality (twenty in this case) of ceramic pipes 4 are set into the edge of the block extending from end to end thereof, the pipes 4 having been cast with the block during manufacture or inserted into prepared holes.
  • the ceramic pipes 4 may be disposed throughout the body of the block 1 extending from end to end thereof.
  • the block tapers from its inlet end to its outlet.
  • the ceramic pipes may be formed of alumina or zirconia for example.
  • the block At its inlet end the block is contained within the side walls 5 of a manifold box 6. It is to be noted that the side walls extend up the refractory block sufficiently to hold the block in position therewithin. The side walls however do not extend to the outlet end of the block and the hot fume therepresent which would otherwise lead to oxidation and melting of the walls.
  • the manifold box is provided with spacers 7 to separate the block from the base wall 8 of the box.
  • An inlet for gas is provided by means of a conduit 9 welded to the base wall 8.
  • gas for injection is passed through the inlet conduit 9 into the manifold box 6 where it is dispersed and travels in parallel with equal speed and flow up each of the ceramic pipes 4.
  • the ceramic pipes may be of between 2 and 4mm internal diameter.
  • a typical block there may be disposed 24 pipes of 2.5mm internal diameter providing in use a gas flow of 250 m3/hr with a system pressure of approximately 12 bar.
  • 40 pipes of 2.00mm internal diameter may be provided in a block, with the same gas flow in use and a system pressure of approximately 10 bar.
  • 20 pipes of 3.00mm internal diameter may be used in a block, providing a gas flow of 400 m3/hr and using a system pressure of approximately 10 bar.
  • FIG 3 can be seen a steel converter vessel 21 having an overhead refining lance 25 and a lining 22.
  • injection elements 23 according to the invention, connected as shown at 24 to a source of stirring gas (not shown).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP87303199A 1986-04-14 1987-04-13 Einblassdüse bei einem Schmelze enthaltenden Behälter Withdrawn EP0242155A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8609063 1986-04-14
GB868609063A GB8609063D0 (en) 1986-04-14 1986-04-14 Injection elements for melt containing vessels

Publications (1)

Publication Number Publication Date
EP0242155A1 true EP0242155A1 (de) 1987-10-21

Family

ID=10596155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87303199A Withdrawn EP0242155A1 (de) 1986-04-14 1987-04-13 Einblassdüse bei einem Schmelze enthaltenden Behälter

Country Status (2)

Country Link
EP (1) EP0242155A1 (de)
GB (2) GB8609063D0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810098C1 (de) * 1988-03-25 1989-03-23 Radex-Heraklith Industriebeteiligungs Ag, Wien, At
FR2645543A1 (fr) * 1989-04-11 1990-10-12 Kadex Heraklith Industriebetei Brique de lavage au gaz calcinee et utilisation de celle-ci
DE4104629A1 (de) * 1991-02-15 1992-08-20 Didier Werke Ag Gasspuelstein

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735400A (en) * 1986-03-28 1988-04-05 Toshin Steel Co., Ltd. Plug for a refining apparatus
US4836433A (en) * 1988-05-13 1989-06-06 Insul Company, Inc. Device for introducing stirring gas into molten metal in metered amount
US4938461A (en) * 1989-06-02 1990-07-03 Zedmark Refractories Corp. Device for distributing gas into molten metal

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947527A (en) * 1957-09-09 1960-08-02 Air Liquide Device for insufflating gas into a mass of molten metal
DE2719829A1 (de) * 1977-05-04 1978-11-09 Georg Gail Gasspuelstein fuer pfannen, oefen etc.
FR2507208A1 (fr) * 1981-06-03 1982-12-10 Nippon Kokan Kk Tuyere d'insufflation de gaz pour l'affinage d'un metal fondu, sa fabrication et son utilisation
GB2120369A (en) * 1982-05-20 1983-11-30 Ksr Int Ltd An improved metallurgical lance
GB2171187A (en) * 1985-02-20 1986-08-20 Didier Werke Ag Sleeve for blowing solid material into molten steel
DE3503222A1 (de) * 1985-01-31 1986-09-18 Didier-Werke Ag, 6200 Wiesbaden Gasspuelkegel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL296346A (de) * 1962-08-07
LU58309A1 (de) * 1969-02-27 1969-07-15
US3905589A (en) * 1972-03-27 1975-09-16 Pennsylvania Engineering Corp Steel production method and apparatus
US3802685A (en) * 1972-08-29 1974-04-09 Steel Corp Q-bop vessel construction
AU541441B2 (en) * 1981-07-15 1985-01-10 Nippon Steel Corporation Bottom blowing nozzle embedded in a refractory block

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947527A (en) * 1957-09-09 1960-08-02 Air Liquide Device for insufflating gas into a mass of molten metal
DE2719829A1 (de) * 1977-05-04 1978-11-09 Georg Gail Gasspuelstein fuer pfannen, oefen etc.
FR2507208A1 (fr) * 1981-06-03 1982-12-10 Nippon Kokan Kk Tuyere d'insufflation de gaz pour l'affinage d'un metal fondu, sa fabrication et son utilisation
GB2120369A (en) * 1982-05-20 1983-11-30 Ksr Int Ltd An improved metallurgical lance
DE3503222A1 (de) * 1985-01-31 1986-09-18 Didier-Werke Ag, 6200 Wiesbaden Gasspuelkegel
GB2171187A (en) * 1985-02-20 1986-08-20 Didier Werke Ag Sleeve for blowing solid material into molten steel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 52 (C-213)[1489], 9th March 1984; & JP-A-58 210 112 (SHIN NIPPON SEITETSKU K.K.) 07-12-1983 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 108 (C-280)[1831], 11th May 1985; & JP-A-60 002 615 (NITSUSHIN SEIKOU K.K.) 08-01-1985 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810098C1 (de) * 1988-03-25 1989-03-23 Radex-Heraklith Industriebeteiligungs Ag, Wien, At
FR2629102A1 (fr) * 1988-03-25 1989-09-29 Radex Heraklith Dispositif pour l'introduction d'un gaz de traitement dans du metal fondu d'un creuset de fusion metallurgique
AT396438B (de) * 1988-03-25 1993-09-27 Radex Heraklith Vorrichtung zum einführen eines behandlungsgases in die schmelze eines metallurgischen schmelzgefässes
FR2645543A1 (fr) * 1989-04-11 1990-10-12 Kadex Heraklith Industriebetei Brique de lavage au gaz calcinee et utilisation de celle-ci
DE4104629A1 (de) * 1991-02-15 1992-08-20 Didier Werke Ag Gasspuelstein

Also Published As

Publication number Publication date
GB8609063D0 (en) 1986-05-21
GB8708836D0 (en) 1987-05-20
GB2189583A (en) 1987-10-28

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

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Effective date: 19880413

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Owner name: BRITISH STEEL PLC

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Effective date: 19891218

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Effective date: 19900429

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Inventor name: NORMANTON, ADRIAN STANTON