EP0093040B1 - Verfahren zur Verlängerung der Haltbarkeit feuerfester gasdurchlässiger Elemente im Boden metallurgischer Gefässe, insbesondere bei Sauerstoffaufblaskonvertern für Stahl - Google Patents

Verfahren zur Verlängerung der Haltbarkeit feuerfester gasdurchlässiger Elemente im Boden metallurgischer Gefässe, insbesondere bei Sauerstoffaufblaskonvertern für Stahl Download PDF

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Publication number
EP0093040B1
EP0093040B1 EP83400766A EP83400766A EP0093040B1 EP 0093040 B1 EP0093040 B1 EP 0093040B1 EP 83400766 A EP83400766 A EP 83400766A EP 83400766 A EP83400766 A EP 83400766A EP 0093040 B1 EP0093040 B1 EP 0093040B1
Authority
EP
European Patent Office
Prior art keywords
slag
converter
elements
permeable refractory
increasing
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
EP83400766A
Other languages
English (en)
French (fr)
Other versions
EP0093040A1 (de
Inventor
Guy Denier
Romain Henrion
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.)
Institut de Recherches de la Siderurgie Francaise IRSID
Arcelor Luxembourg SA
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
Arbed SA
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 Institut de Recherches de la Siderurgie Francaise IRSID, Arbed SA filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT83400766T priority Critical patent/ATE33401T1/de
Publication of EP0093040A1 publication Critical patent/EP0093040A1/de
Application granted granted Critical
Publication of EP0093040B1 publication Critical patent/EP0093040B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • 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
    • 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
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C21C5/44—Refractory linings
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/003—Linings or walls comprising porous bricks
    • 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
    • F27D2003/161—Introducing a fluid jet or current into the charge through a porous element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/02—Preheating, e.g. in a laminating line
    • F27M2003/025—Drying

Definitions

  • the present invention relates to the field of the production of metals, in particular steel. More specifically, it relates to metallurgical refining vessels, in particular steel refinery converters with top-blown oxygen blowing, the bottom of which is provided with permeable refractory elements.
  • Metallurgical treatments consist in subjecting a bath of molten metal to pneumatic stirring by controlled injection of a stirring fluid, usually an inert gas such as nitrogen or argon, through permeable refractory elements mounted in the usual refractory lining which forms the bottom of the container containing the bath (FR-A-2,322,202, US No. 3,259,484).
  • a stirring fluid usually an inert gas such as nitrogen or argon
  • the subject of the invention is a method for improving the life of the permeable refractory elements fitted to the bottom of metallurgical refining vessels, in particular the converters of steel blown from above, said elements serving for the controlled injection of a stirring fluid into the molten metal bath contained in the container, process characterized in that during the refining of any charge, a fluid slag is formed which is kept then in the converter after casting the molten metal by tilting said container; in that the container is straightened in a vertical position so that the milk is deposited and distributed on the bottom; and in that said slag is allowed to dry and ensure its setting while maintaining in the permeable refractory elements a sufficient pressure to ensure a permanent flow of the brewing fluid not exceeding approximately 30 m 3 / h per element, counted in m 3 gas, so as to form a network of channels connecting the blowing face of said elements to the free surface of the bottom through the layer of slag deposited.
  • the metallurgical refining container is a converter of steelworks to oxygen blown from above (type LD), it being understood that the invention also applies to any metallurgical container capable of tipping over. around a horizontal axis and in which the refining operation is accompanied by the formation of a slag.
  • the deposition technique according to the invention is inspired by the practice of maintaining the funds of steelworks converters, known under the Anglo-Saxon name pictured "slagging-in” and reported, for example, in the European patent application. published n ° 0007657. It can be carried out systematically after each charge, or at least after each charge which has led to exposure, even partial, of the permeable refractory elements.
  • the proposed method is very simple and poses no uncontrolled difficulty. It supposes only the precaution of forming, during, or more simply at the end of refining of a charge, a slag capable, by its fluidity, of flowing along the wall of the converter, then spreading over the bottom and stick to it while hardening. In practice, this boils down to a person skilled in the art to a visual verification of the slag's ability to meet these three requirements, which, moreover, is intended to be designated by the expression "we form a fluid slag" used in the above formulation of the object of the invention.
  • thinning agents such as fluorspar, or other usual flux, which lowers its melting temperature.
  • thickeners will be added to the slag, for example dolomite or any other refractory oxide or mixture of refractory oxides which is commonly used in steel works.
  • the slag forms a refractory layer which subtracts the permeable elements from direct contact with the molten metal bath. Furthermore, the presence of these permeable elements at the bottom does not imply any other requirement during the hardening of the slag than that which consists in maintaining through them a low flow rate of brewing fluid, flow which can be qualified "safety" and which, moreover, does not penalize productivity in any way, since it takes place during the necessary hardening of the slag.
  • a possible indicator of the "level" of permeability can be constituted by the pressure / flow rate ratio of fluid in the supply line of the latter to the permeable refractory element. This ratio can be determined from a reference value taken when the element is in the new state by vacuum blowing, or during the refining of the first charge to the converter.
  • stirring fluid which can, for one part, circulate laterally in zones of less pressure drop which possibly form at the interface of the layer of slag deposited and of the pre-existing refractory bottom.
  • the technique according to the invention can be implemented at any time, between any two loads of the same campaign or even at the end of the first load, on a converter in the state new.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (4)

1. Verfahren zur Verlängerung der Haltbarkeit feuerfester, gasdurchlässiger Elemente, die im Boden von Sauerstoff-Aufblaskonvertern für Stahl angeordnet sind, wobei die Elemente zum kontrollierten Einblasen eines Durchmischungsfluids in das Bad aus geschmolzenem Metall im Konverter dienen, dadurch gekennzeichnet, daß während des Frischens einer beliebigen Charge eine flüssige Schlacke gebildet wird, die nach dem Abgießen des flüssigen Metalls durch Kippen des Konverters im Konverter verbleibt; daß der Konverter wieder in die senkrechte Stellung verbracht wird, so daß sich die Schlacke ablagert und über den Boden verteilt; und daß man die Schlacke erhärten läßt und ihre Verbindung mit dem Boden ermöglicht unter Aufrechterhaltung eines ausreichenden Druckes in den gasdurchlässigen feuerfesten Elementen für eine perma-- nente Leistung an Durchmischungsfluid, die ungefähr 30 m3/h pro Element nicht übersteigt gemessen in gasförmigen m3, so daß sich ein Kanalnetz ausbildet, das die Blasfläche der Elemente mit der freien Oberfläche des Bodens durch die abgelagerte Schlackenschicht hindurch verbindet.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Erlieichterung der Verteilung der Schlacke auf dem Boden der Konverter in beiden Richtungen aus der senkrechten Stellung verschwenkt wird.
3. Verfahren nach Ansprüchen 1 oder 2, dudurch gekennzeichnet, daß zur Erhöhung der Fließfähigkeit der Schlacke gegebenenfalls während oder nach dem Frischen in den Konverter Verdünnungsmittel gegeben werden, um die Schmelztemperatur in der Schlacke zu verringern.
4. Verfahren nach Ansprüchen 1 oder 2, dudurch gekennzeichnet, daß zur Verringerung der Fließfähigkeit der Schlacke gegebenenfalls während oder nach dem Frischen in den Konverter Verdickungsmittel gegeben werden zur Erhöhung der Schmelztemperatur der Schlacke.
EP83400766A 1982-04-22 1983-04-18 Verfahren zur Verlängerung der Haltbarkeit feuerfester gasdurchlässiger Elemente im Boden metallurgischer Gefässe, insbesondere bei Sauerstoffaufblaskonvertern für Stahl Expired EP0093040B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400766T ATE33401T1 (de) 1982-04-22 1983-04-18 Verfahren zur verlaengerung der haltbarkeit feuerfester gasdurchlaessiger elemente im boden metallurgischer gefaesse, insbesondere bei sauerstoffaufblaskonvertern fuer stahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8207118 1982-04-22
FR8207118A FR2525633A1 (fr) 1982-04-22 1982-04-22 Procede pour ameliorer la duree de vie d'elements refractaires permeables loges dans le fond des recipients metallurgiques d'affinage, notamment des convertisseurs d'acierie a soufflage d'oxygene par le haut

Publications (2)

Publication Number Publication Date
EP0093040A1 EP0093040A1 (de) 1983-11-02
EP0093040B1 true EP0093040B1 (de) 1988-04-06

Family

ID=9273360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400766A Expired EP0093040B1 (de) 1982-04-22 1983-04-18 Verfahren zur Verlängerung der Haltbarkeit feuerfester gasdurchlässiger Elemente im Boden metallurgischer Gefässe, insbesondere bei Sauerstoffaufblaskonvertern für Stahl

Country Status (13)

Country Link
US (2) US4690386A (de)
EP (1) EP0093040B1 (de)
JP (1) JPS5941412A (de)
KR (1) KR910002863B1 (de)
AT (1) ATE33401T1 (de)
BE (1) BE896539A (de)
BR (1) BR8302006A (de)
CA (1) CA1205637A (de)
DE (1) DE3376225D1 (de)
FR (1) FR2525633A1 (de)
IT (1) IT1194212B (de)
LU (1) LU84742A1 (de)
ZA (1) ZA832760B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19913335A1 (de) * 1999-03-24 2000-09-28 Linde Tech Gase Gmbh Verfahren zum Beschichten der Ausmauerung eines Konverters und Beschichtung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61139534A (ja) * 1984-12-12 1986-06-26 Shin Meiwa Ind Co Ltd 三転ダンプカ−のヒンジ切換状態表示装置
JPS61139533A (ja) * 1984-12-12 1986-06-26 Shin Meiwa Ind Co Ltd 三転ダンプカ−のヒンジ異常状態検出装置
DD300677A7 (de) * 1989-06-20 1992-07-02 Eko Stahl Ag,De Verfahren zur erhoehung der haltbarkeit der feuerfesten auskleidung von metallurgischen gefaessen
DE3936715A1 (de) * 1989-11-03 1991-05-08 Kortec Ag Verfahren zum einbringen von fliessfaehigen zuschlagsstoffen in ein metallurgisches gefaess und gefaess fuer dieses verfahren
DE4003646C1 (de) * 1990-02-07 1990-12-13 Intocast Gmbh Feuerfestprodukte Und Giesshilfsmittel, 4030 Ratingen, De
US5772931A (en) * 1996-12-20 1998-06-30 Dofasco Inc. Slag coating process
KR20030003316A (ko) * 2001-06-30 2003-01-10 백 웨인 다목적 이쑤시개

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
BE631565A (de) *
CA460246A (en) * 1949-10-11 B. Story Edward Lining rotary furnace
US3259484A (en) * 1962-04-16 1966-07-05 Loire Atel Forges Method and apparatus for producing steel from pig iron
CA919893A (en) * 1970-01-15 1973-01-30 D. Labate Michael Process for lining metallurgical furnaces
DE2028578B2 (de) * 1970-06-10 1976-01-02 Nippon Kokan K.K., Tokio Feuerfeste Zustellung für Öfen oder Gießpfannen für die Stahlherstellung
DE2100874A1 (de) * 1971-01-09 1972-07-20 Kretz, Erich, 4000 Düsseldorf Trägerrost
FR2322202A1 (fr) * 1975-08-29 1977-03-25 Siderurgie Fse Inst Rech Procede d'elaboration d'acier par soufflage d'oxygene
JPS5337120A (en) * 1976-09-18 1978-04-06 Nippon Steel Corp Operating method for converter
NL176088B (nl) * 1978-07-14 1984-09-17 Estel Hoogovens Bv Werkwijze voor het bedrijven van een staalconverter en een staalconverter te gebruiken hierbij.
US4298378A (en) * 1978-12-22 1981-11-03 Kawasaki Jukogyo Kabushiki Kaisha Rotary steel converter, method of making steel there-with and method of applying refractory lining to converter
JPS5585618A (en) * 1978-12-22 1980-06-27 Kawasaki Heavy Ind Ltd Coating method for converter with refractory material
CA1143947A (en) * 1979-02-07 1983-04-05 Jerry V. Spruell Method for increasing vessel lining life for basic oxygen furnaces
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
JPS5938282B2 (ja) * 1980-07-03 1984-09-14 川崎製鉄株式会社 底吹き転炉炉壁面へのスラグコ−テイング方法
JPS5811717A (ja) * 1981-07-15 1983-01-22 Nippon Steel Corp 多孔質スラグコ−テイングによるガス吹込孔の保護層形成方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19913335A1 (de) * 1999-03-24 2000-09-28 Linde Tech Gase Gmbh Verfahren zum Beschichten der Ausmauerung eines Konverters und Beschichtung

Also Published As

Publication number Publication date
FR2525633B1 (de) 1984-11-09
ATE33401T1 (de) 1988-04-15
IT1194212B (it) 1988-09-14
US4690386A (en) 1987-09-01
IT8320765A1 (it) 1984-10-22
ZA832760B (en) 1983-12-28
JPS5941412A (ja) 1984-03-07
KR910002863B1 (ko) 1991-05-06
BE896539A (fr) 1983-08-16
DE3376225D1 (en) 1988-05-11
BR8302006A (pt) 1983-12-27
KR840004372A (ko) 1984-10-15
US4735398A (en) 1988-04-05
IT8320765A0 (it) 1983-04-22
EP0093040A1 (de) 1983-11-02
FR2525633A1 (fr) 1983-10-28
CA1205637A (fr) 1986-06-10
LU84742A1 (fr) 1983-12-05

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