EP0093039B1 - Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material - Google Patents

Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material Download PDF

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Publication number
EP0093039B1
EP0093039B1 EP83400765A EP83400765A EP0093039B1 EP 0093039 B1 EP0093039 B1 EP 0093039B1 EP 83400765 A EP83400765 A EP 83400765A EP 83400765 A EP83400765 A EP 83400765A EP 0093039 B1 EP0093039 B1 EP 0093039B1
Authority
EP
European Patent Office
Prior art keywords
concrete
refractory
vessel
elements
permeability
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
EP83400765A
Other languages
English (en)
French (fr)
Other versions
EP0093039A1 (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 AT83400765T priority Critical patent/ATE34774T1/de
Publication of EP0093039A1 publication Critical patent/EP0093039A1/de
Application granted granted Critical
Publication of EP0093039B1 publication Critical patent/EP0093039B1/de
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
    • C21C5/44—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
    • 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
    • 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
    • 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. It relates more precisely to metallurgical vessels, particularly refining converters, 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. incorporated into the usual refractory lining of the container containing the bath and opening under the surface of the latter. More generally, these blowing elements are housed in the bottom of the container (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 treatment method for improving the permeability of the bottoms of metallurgical vessels, in particular steel converters with top blowing oxygen blowing, said bottoms being provided with permeable refractory elements for the controlled introduction of a stirring fluid into the bath of molten metal contained in the container, process characterized in that, after emptying the container of its content at the end of the refining of any load, a concrete of refractory material compatible with the refractory material constituting the bottom is deposited in the bottom, said concrete having sufficient fluidity to ensure its spread over the bottom; and in that the concrete is left to dry and ensure its setting, while maintaining in the permeable refractory elements a sufficient pressure to provide a permanent flow of mixing fluid. not exceeding approximately 30 m 3 / h per element counted in gas m 3 .
  • a well pourable refractory concrete is prepared, capable of reaching the bottom of the container from the spout by flowing along the side wall; this concrete is poured into the container through the spout, the container being in an inclined position, for example in an intermediate position between the upright position and the completely tilted position which it presents at the end of casting of the molten metal, then it is straightened to vertical to ensure the distribution of the concrete on the bottom and the concrete is allowed to dry and ensure its setting, while maintaining in the permeable refractory elements a sufficient pressure to ensure a flow of mixing fluid.
  • the container can be tilted on either side of its vertical position to perfect the spreading of the concrete on the bottom.
  • the metallurgical container is a refining converter for oxygen blown from above by means of an emerging vertical lance, it being understood that the in vention also applies to any other metallurgical vessel, for example, ladles or arc furnaces.
  • a concrete of refractory material compatible with the refractory material constituting the bottom is intended to denote any refractory material capable, taking into account the nature of the bottom, of sticking to the latter during its solidification. It is for example a magnesian concrete if the bottom has a predominance in magnesia, or a dolomitic concrete if the bottom is based on dolomite, etc ...
  • well pourable refractory concrete is meant to qualify a preparation of the latter which makes it more fluid than the fluidity which would result from a preparation in accordance with the prescriptions of the concrete manufacturer.
  • this concrete is generally a question of making this concrete very moist, that is to say containing an excess of water compared to the usual prescriptions so as to achieve a content of the order of 10% by weight.
  • the lower limit of the humidity rate to be adopted must take into account the capacity, that is to say the size of the container, in particular its height and the diameter of the bottom, as well as its thermal mass, so that the concrete can, by being introduced by the upper open end (the spout) reach the bottom, then once the bottom is reached, spread there before solidifying.
  • the water content is preferably between 8 and 10% by weight, that is to say 1 to 2 points more than that recommended by the manufacturer as much as possible (up to 7%, but more generally between 3 and 6%).
  • the method according to the invention is simple, inexpensive, and poses no uncontrolled difficulty.
  • the presence of permeable refractory elements housed in the bottom does not imply any other requirement during the drying of the concrete than that which consists in maintaining through them a minimum flow of the mixing fluid, a flow which can be qualified " of security".
  • the concrete is in mechanical engagement on the bottom and forms a refractory layer which can reach in the central area, an average thickness of between 5 and 20 cm approximately (240 t converter).
  • the converter is then ready for processing new loads.
  • a possible indicator of the "level" of permeability can be constituted by the pressure / flow ratio of stirring fluid in the supply line of the latter to the permeable refractory element. This ratio can be determined from a reference value, the permeable element being taken in new condition with vacuum blowing or during the refining of the first charge to the converter.
  • the mixing fluid being able to circulate on the one hand laterally in zones of least pressure drop which possibly form at the interface of the deposited concrete layer and the pre-existing refractory bottom.
  • the technique according to the invention can be implemented at any time, either between two refining campaigns, or between two charges of the same campaign, or even before the first charge, on a converter in the state new.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic 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)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Ceramic Products (AREA)
  • Fire-Extinguishing Compositions (AREA)

Claims (4)

1. Verfahren zur Erhöhung der Gasdurchlässigkeit der Böden metallurgischer Gefäße, insbesondere von Stahlkonvertern mit von oben erfolgender Sauerstoffeinblasung, wobei die Böden mit gasdurchlässigen, feuerfesten Elementen versehen sind zum gesteuerten Einblasen eines Rührfluides in das geschmolzene Metallbad, dadurch gekennzeichnet, daß nach dem Entfernen des Inhaltes des Behälters auf dem Boden ein Beton aufgebracht wird aus einem feuerfestem Material, das verträglich ist mit demjenigen, das den Boden bildet, wobei der Beton eine ausreichende Fließfähigkeit aufweist, um sein Ausbreiten auf die Bodenfläche gewährleisten zu können und daß man den Beton trocknen und sich festsetzen läßt unter Aufrechterhaltung eines ausreichenden Druckes in den gasdurchlässigen, feuerfesten Elementen, um eine ständige Durchflußleistung von Rührfluid zu ermöglichen, die ungefähr 30 m3/h pro Element, gemessen in gasförmigen m3, nicht übersteigt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein Beton hergestellt wird, der gut gießbar ist, d.h. der in der Lage ist, den Gefäßboden zu erreichen, indem er ausgehend von der Gießschnauze an den Seitenwänden entlang fließt; daß nach dem Entfernen des Inhaltes des Behälters der Beton über die Gießschnauze in das Gefäß eingefüllt wird, wobei das Gefäß in gekippter Stellung ist, wonach es in die Senkrechte zurückverdreht wird, um die Verteilung des Betons auf dem Boden zu gewährleisten, wonach man ihn trocknen und sich festsetzen läßt unter Aufrechterhaltung eines ausreichenden Drucks in den feuerfesten, gasdurchlässigen Elementen, um einen permanenten Durchfluß eines Rührfluids zu ermöglichen.
3. Verfahren nach Anspruch 2, dadurch gekennnzeichnet, daß nach dem Einfüllen des Betons in das Gefäß dieses eine Schaukelbewegung um seine senkrechte Stellung ausführt, um die Ausbreitung des Betons auf dem Boden zu vervolikommnen.
4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß ein magnesiumhaltiger, feuerfester Beton mit einem Wassergehalt von 8 bis 10 Gewichtsprozent verwendet wird.
EP83400765A 1982-04-22 1983-04-18 Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material Expired EP0093039B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400765T ATE34774T1 (de) 1982-04-22 1983-04-18 Verfahren zur erhoehung der gasdurchlaessigkeit von feuerfesten elementen im boden von metallurgischen gefaessen sowie hierfuer geeignetes material.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8207117A FR2525632A1 (fr) 1982-04-22 1982-04-22 Procede de traitement pour ameliorer la permeabilite des fonds de recipients metallurgiques pourvus d'elements refractaires permeables, et materiaux pour sa mise en oeuvre
FR8207117 1982-04-22

Publications (2)

Publication Number Publication Date
EP0093039A1 EP0093039A1 (de) 1983-11-02
EP0093039B1 true EP0093039B1 (de) 1988-06-01

Family

ID=9273359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400765A Expired EP0093039B1 (de) 1982-04-22 1983-04-18 Verfahren zur Erhöhung der Gasdurchlässigkeit von feuerfesten Elementen im Boden von metallurgischen Gefässen sowie hierfür geeignetes Material

Country Status (14)

Country Link
US (2) US4696456A (de)
EP (1) EP0093039B1 (de)
JP (1) JPS59104418A (de)
KR (1) KR910003514B1 (de)
AT (1) ATE34774T1 (de)
BE (1) BE896538A (de)
BR (1) BR8302046A (de)
CA (1) CA1206007A (de)
DE (1) DE3376850D1 (de)
ES (2) ES8402616A1 (de)
FR (1) FR2525632A1 (de)
IT (1) IT1194213B (de)
LU (1) LU84741A1 (de)
ZA (1) ZA832761B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2525632A1 (fr) * 1982-04-22 1983-10-28 Siderurgie Fse Inst Rech Procede de traitement pour ameliorer la permeabilite des fonds de recipients metallurgiques pourvus d'elements refractaires permeables, et materiaux pour sa mise en oeuvre
DE4221101C2 (de) * 1992-06-26 1994-05-05 Veitsch Radex Ag Verwendung einer feuerfesten keramischen Masse zur Auskleidung von Böden an Elektro-Lichtbogenöfen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
IT977989B (it) * 1972-01-03 1974-09-20 Uss Eng & Consult Metodo per la preparazione di una suola amovibile colata per un for no usato nella produzione di ac ciaio
FR2322202A1 (fr) * 1975-08-29 1977-03-25 Siderurgie Fse Inst Rech Procede d'elaboration d'acier par soufflage d'oxygene
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
DE2912771A1 (de) * 1979-03-30 1980-10-09 Stahl Consulting Gmbh Verfahren zum trocken-spritzauskleiden
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
FR2525632A1 (fr) * 1982-04-22 1983-10-28 Siderurgie Fse Inst Rech Procede de traitement pour ameliorer la permeabilite des fonds de recipients metallurgiques pourvus d'elements refractaires permeables, et materiaux pour sa mise en oeuvre

Also Published As

Publication number Publication date
ATE34774T1 (de) 1988-06-15
FR2525632A1 (fr) 1983-10-28
IT1194213B (it) 1988-09-14
ES521715A0 (es) 1984-02-01
ES8402617A1 (es) 1984-02-01
ES521716A0 (es) 1984-02-01
FR2525632B1 (de) 1984-08-24
US4696456A (en) 1987-09-29
JPS59104418A (ja) 1984-06-16
IT8320767A0 (it) 1983-04-22
JPH0368925B2 (de) 1991-10-30
IT8320767A1 (it) 1984-10-22
ZA832761B (en) 1983-12-28
DE3376850D1 (en) 1988-07-07
ES8402616A1 (es) 1984-02-01
BR8302046A (pt) 1983-12-27
KR910003514B1 (ko) 1991-06-03
CA1206007A (fr) 1986-06-17
LU84741A1 (fr) 1983-12-05
KR840004455A (ko) 1984-10-15
EP0093039A1 (de) 1983-11-02
BE896538A (fr) 1983-08-16
US4779846A (en) 1988-10-25

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