EP0080403B1 - Dispositif pour l'introduction de gaz dans un bain de métal liquide - Google Patents

Dispositif pour l'introduction de gaz dans un bain de métal liquide Download PDF

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Publication number
EP0080403B1
EP0080403B1 EP82402089A EP82402089A EP0080403B1 EP 0080403 B1 EP0080403 B1 EP 0080403B1 EP 82402089 A EP82402089 A EP 82402089A EP 82402089 A EP82402089 A EP 82402089A EP 0080403 B1 EP0080403 B1 EP 0080403B1
Authority
EP
European Patent Office
Prior art keywords
enclosure
refractory
plates
permeable
box
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
Application number
EP82402089A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0080403A1 (fr
Inventor
Jean Cordier
Jean-Pierre Barbotin
Jean-Pierre Kiehl
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.)
USINOR SA
Original Assignee
Union Siderurgique du Nord et de lEst de France SA USINOR
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 Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical Union Siderurgique du Nord et de lEst de France SA USINOR
Priority to AT82402089T priority Critical patent/ATE28667T1/de
Publication of EP0080403A1 publication Critical patent/EP0080403A1/fr
Application granted granted Critical
Publication of EP0080403B1 publication Critical patent/EP0080403B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • 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

Definitions

  • the present invention relates to a permeable device for the introduction of gas into a bath of liquid metal and more particularly for the introduction of a stirring gas in liquid steel.
  • nozzles or permeable bricks of rectangular section which have approximately the same format as that of the bricks which are used for briquetting the refractory lining of the bottom of the converters.
  • These permeable bricks are made up of permeable elements, molded or enclosed within a thin sheet metal box, at the base of which the brewing gas is injected, by a tube which is welded to it.
  • Document FR-E-90233 describes a permeable device for the introduction of gas into a bath of liquid metal, comprising a casing in which is disposed an enclosure open at its upper part, in which is placed at least one retained permeable refractory element by a first refractory binder, the bottom of the enclosure comprising an orifice connected to an intake tube of said gases and the enclosure being fixed in the envelope by means of a second refractory binder.
  • the gas intake manifold in the refractory element does not strictly speaking pass through the bottom of the envelope. Indeed, it extends concentrically inside the tube which it crosses this bottom. It follows that the arrangement described in this prior document only provides a simple seal for each of the two fluids it transmits, so that the problems analyzed above are not resolved.
  • the permeable element is formed of a set of parallelepipedal plates arranged vertically and comprising, on their large faces of the microchannels, oriented in the direction of passage of the gas.
  • This set of plates is placed inside an enclosure, the bottom of which has an orifice connected to a gas intake tube. All of the plates can be retained in the enclosure using a layer of refractory concrete.
  • the present invention aims to remedy these drawbacks by providing a permeable element for the introduction of gas into a liquid metal which does not present the risks of dissolving the permeable elements of the envelope in which they are contained.
  • the invention thus relates to a permeable device for the introduction of gas into a bath of liquid metal, comprising a casing in which is disposed an enclosure open at its upper part, in which is placed at least one permeable refractory element retained by a first refractory binder, the bottom of the enclosure comprising an orifice connected to a tube for admitting said gases and the enclosure being fixed in the envelope by means of a second refractory binder, characterized in that the envelope is present in the form of a box open at its upper part and comprising a bottom leaktightly crossed by the gas inlet tube.
  • the enclosure preferably comprises a body of revolution, substantially frustoconical, the smallest diameter of which is at the upper opening and the side wall of which is provided with retaining means protruding inwards and a curved bottom whose convexity is turned towards the bottom of the box.
  • the retaining means may consist of at least one circumferential groove and / or of a set of lugs formed in the side wall by stamping or any other means.
  • the permeable device according to the present invention shown in Figure 1 comprises a box 1 of generally parallelepipedal shape open at its upper part and having a flat bottom, this box being made of a thin sheet.
  • the bottom of the box 1 is crossed by a tube 2 for the gas inlet which is welded in a leaktight manner to the bottom of the box.
  • This enclosure comprises a body 4 of substantially frustoconical shape open at its upper part, the smallest diameter of the frustoconical body corresponding to the opening and a domed bottom 5, the convexity of which faces the bottom of the box.
  • the domed bottom 5 has an orifice 6 which is connected in leaktight manner to the tube 2 by a weld.
  • the frustoconical body 4 has along its lateral wall two circumferential grooves 7 which project towards the inside of the enclosure 3.
  • circumferential grooves 7 can be replaced by lugs 7a, or else an appropriate combination of these grooves 7 and lugs 7a can be used.
  • Refractory permeable elements 8 are placed in the enclosure 3 on a bed of granular refractory material 9 intended to distribute the stirring gas over the entire section of the permeable element (more clearly visible in FIG. 2).
  • the permeable elements 8 are inserted into a first refractory binder 10 which is vibrated (or packed) in the annular space located between these permeable elements and the enclosure 3, above said bed of granular material 9.
  • the refractory material 10 is compatible with the refractory material which constitutes the permeable elements 8 and adheres securely to the latter whose walls are rough and / or provided with asperities. This reduces the risk of displacement of all of the permeable elements, inside the enclosure 3, on the one hand, thanks to the frustoconical shape of the latter, and, on the other hand, thanks to the circumferential grooves located in planes parallel to the upper opening and / or to the lugs formed on the internal face of the enclosure, which prevent any movement of the refractory 10 relative to this enclosure 3.
  • the enclosure 3 is made of a sufficiently thick sheet metal to resist the pressure of the gas and its domed bottom also contributes to increasing the resistance to the pressure of the gas.
  • the assembly thus consisting of the enclosure 3 in which are placed permeable elements 8 embedded in a refractory binder 10, is housed in the casing 1 and made integral with the latter by insertion of a second refractory binder 11 in the space left free between the enclosure 3 and the box 1.
  • a rigid, one-piece assembly is thus produced between the enclosure 3 and the elements it contains, and the box 1.
  • This box 1 is generally substantially parallelepipedal or pyramidal in shape which is compatible with the format of the brickwork used for the bottom of the converter.
  • the second refractory binder 11 is for example a refractory clay compatible with both the first refractory binder 10 and the refractory material which constitutes the bricks of the refractory lining covering the bottom of the converter.
  • the permeable elements 8 can be in the form of a monolithic mass produced from a grainy, sintered, porous refractory mixture, for example as described in US Pat. No. 4,230,931, or under the form of a stack of plates made of a refractory material, these plates being placed side by side and arranged vertically in the enclosure 3.
  • the plates 8, one of which is shown in detail in FIG. 3, have in particular a parallelepipedic or preferably prismatic shape generated on a trapezoidal base and are arranged vertically according to their largest dimension, such that the large base 12 of the main faces 13 of the plates rests on the bed of granular refractory material 9.
  • the refractory mass constituted by the adjoining plates, is given the desired permeability for the passage of gases, by producing substantially vertical microchannels which promote the flow of the gas and ensure the permeability and the flow of gas through the permeable elements.
  • microchannels For example, longitudinally streak one or both main faces 13 of the plates which are then joined together, so that the grooves, when the plates are stacked, constitute these longitudinal microchannels which give the permeable element excellent permeability and allow large quantities of gas to be delivered.
  • the microchannels can also be obtained by introducing during pressing of these plates at the bottom of the mold an aerated organic fabric whose wire diameter will be between 1 / 10th of a millimeter to 0.3 mm. When these parts are cooked, the organic fiber fabric will burn and will therefore give the platelets the microchannels necessary for good permeability.
  • the refractory material constituting the permeable element 8 is chosen to withstand the thermal shocks to which it is subjected when, preheated by the atmosphere of the converter, it is suddenly cooled when the mixing gas is admitted at full flow.
  • This material must resist the action of gases which pass through it and which can be, for example: neutral, such as nitrogen or argon; reducing agents such as carbon monoxide, hydrogen; oxidants such as oxygen or water vapor; or carbonating agents such as carbon dioxide; or compatible mixtures of these gases. These materials must therefore resist the corrosive action of the oxidized liquid metal as well as that of the basic slag loaded with iron oxide with which they are in contact during the brewing operations.
  • These materials can in particular be based on grains of magnesia, corundum, sintered and / or electrofused mullite, bonded together by clay, alumina and / or chromium oxide, then refritted at high temperature. All of these plates could be made entirely of silicon nitride or a variety of sialons.
  • this refractory element with surface or porous ridges, it is also possible to add to the above compounds, graphite or boron nitride which further reduce the wettability of these elements relative to the molten metal.
  • the first refractory binder 10 in which the permeable elements 8 are embedded must obviously be compatible with these latter and is a material conventionally used for this purpose.
  • the second refractory binder material is also a conventional material such as a basic rammed earth chosen for its compatibility both with the first refractory binder and with the basic refractory material which constitutes the briquetting of the bottom of the converter.
  • the metal envelopes constituting the box 1 and the envelope 3 are liquefied and eliminated at least over a certain height so that the basic refractory material constituting the brickwork of the bottom of the converter contact of the second refractory binder 11 which is itself in contact with the first refractory binder 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Treating Waste Gases (AREA)
  • Incineration Of Waste (AREA)
  • Gas Separation By Absorption (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP82402089A 1981-11-23 1982-11-16 Dispositif pour l'introduction de gaz dans un bain de métal liquide Expired EP0080403B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82402089T ATE28667T1 (de) 1981-11-23 1982-11-16 Einrichtung zum einfuehren von gas in ein metallbad.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8121860 1981-11-23
FR8121860A FR2516938B1 (fr) 1981-11-23 1981-11-23 Dispositif pour l'introduction de gaz dans le bain de metal liquide

Publications (2)

Publication Number Publication Date
EP0080403A1 EP0080403A1 (fr) 1983-06-01
EP0080403B1 true EP0080403B1 (fr) 1987-07-29

Family

ID=9264249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82402089A Expired EP0080403B1 (fr) 1981-11-23 1982-11-16 Dispositif pour l'introduction de gaz dans un bain de métal liquide

Country Status (5)

Country Link
EP (1) EP0080403B1 (es)
JP (1) JPS5896808A (es)
AT (1) ATE28667T1 (es)
DE (1) DE3276872D1 (es)
FR (1) FR2516938B1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19542446A1 (de) * 1995-11-14 1997-05-15 Lorenz Doetsch Feuerfeste Formplatten mit Gasführungskanälen

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734713A1 (de) * 1987-10-14 1989-04-27 Pa Ha Ge Huetten Und Giesserei Spuelstein fuer metallurgische gefaesse
WO1989007659A1 (en) * 1988-02-19 1989-08-24 Veitscher Magnesitwerke-Actien-Gesellschaft Gas-permeable block for metallurgical operations
JPH0472736A (ja) * 1990-07-13 1992-03-06 Mitsubishi Electric Corp 半導体装置の製造方法
FR2758486B1 (fr) * 1997-01-23 1999-03-26 Savoie Refractaires Dispositif perfectionne d'insufflation d'un gaz dans un metal en fusion
DE102005060432A1 (de) * 2005-12-15 2007-06-21 Pa-Ha-Ge Feuerfeste Erzeugnisse Gmbh & Co. Kg Spülkegel
WO2013172975A1 (en) 2012-05-18 2013-11-21 Vesuvius Crucible Company Purge plug
CN106825533A (zh) * 2015-12-03 2017-06-13 刘得顺 一种可修复组合型透气砖的制作方法
CN115261632B (zh) * 2022-07-21 2023-07-11 云南浩鑫铝箔有限公司 一种用于铝箔生产加工用的铝液熔炼除渣装置及方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR90233E (fr) * 1966-06-27 1967-11-03 Air Liquide Perfectionnement aux injecteurs, tuyères et brûleurs pour fours métallurgiques
LU54172A1 (es) * 1967-07-26 1969-05-21
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
FR2471416A1 (fr) * 1979-12-10 1981-06-19 Siderurgie Fse Inst Rech Elements refractaires poreux et procede de fabrication
BE881853A (fr) * 1980-02-21 1980-08-21 Centre Rech Metallurgique Procede d'affinage pneumatique de fonte au convertisseur
LU82597A1 (de) * 1980-07-09 1982-02-17 Arbed Feuerfester,gasdurchlaessiger baukoerper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19542446A1 (de) * 1995-11-14 1997-05-15 Lorenz Doetsch Feuerfeste Formplatten mit Gasführungskanälen
DE19542446C2 (de) * 1995-11-14 1998-05-28 Doetsch Geb Richard Marie Luis Feuerfeste Formplatten mit Gasführungskanälen

Also Published As

Publication number Publication date
FR2516938B1 (fr) 1986-06-06
JPS5896808A (ja) 1983-06-09
EP0080403A1 (fr) 1983-06-01
ATE28667T1 (de) 1987-08-15
JPH0235007B2 (es) 1990-08-08
FR2516938A1 (fr) 1983-05-27
DE3276872D1 (en) 1987-09-03

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