EP0097610B1 - Procédé et dispositif pour vidanger des récipients métallurgiques - Google Patents

Procédé et dispositif pour vidanger des récipients métallurgiques Download PDF

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Publication number
EP0097610B1
EP0097610B1 EP83630104A EP83630104A EP0097610B1 EP 0097610 B1 EP0097610 B1 EP 0097610B1 EP 83630104 A EP83630104 A EP 83630104A EP 83630104 A EP83630104 A EP 83630104A EP 0097610 B1 EP0097610 B1 EP 0097610B1
Authority
EP
European Patent Office
Prior art keywords
tap hole
plug
gas
arm
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.)
Expired
Application number
EP83630104A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0097610A1 (fr
Inventor
François Schleimer
Jean Goedert
Ferdinand Goedert
Romain Henrion
Ferdinand Thill
Henri Klein
Jean-François Liesch
Jean Peckels
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.)
Arcelor Luxembourg SA
Original Assignee
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
Priority claimed from LU84213A external-priority patent/LU84213A1/fr
Priority claimed from LU84237A external-priority patent/LU84237A1/de
Application filed by Arbed SA filed Critical Arbed SA
Priority to AT83630104T priority Critical patent/ATE20440T1/de
Publication of EP0097610A1 publication Critical patent/EP0097610A1/fr
Application granted granted Critical
Publication of EP0097610B1 publication Critical patent/EP0097610B1/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
    • 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
    • C21C5/4653—Tapholes; Opening or plugging thereof
    • 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 method and a device for emptying tilting metallurgical vessels, in particular steelworks converters, comprising a tap hole arranged in the side wall and containing molten metal on which slag is swimming.
  • a taphole closing device comprising a closing body which can be inserted into the taphole which leaves an annular slot free relative to the wall of the taphole and which contains a pressurized gas line.
  • the closure body has an outer wall which tapers towards the orifice of the pressurized gas line. The slag is forced back into the container under the effect of the gas flow.
  • This device which is subject to significant wear in large converters, has been improved (cf. EP-A-10.082) in that the external lateral surface of the shutter consists of a surface in the form of spherical cap which, on the side of the mouth, turns into a frusto-conical surface.
  • the shutter is made of gray cast iron. Both devices have the disadvantage that they require large quantities of gas to seal the taphole. In addition, there are problems of blockage of the mouth of the gas pipe of the shutter.
  • the object of the present invention is to propose a remedy for the drawbacks described, and to eliminate in a large proportion the slag entrainment during the emptying of metallurgical vessels.
  • Fig. part of a refining crucible 1 the tap hole 2 of which is closed by a plug 3.
  • the plug 3 is mounted on an arm 4, which pivots about an axis 5. fixed to the wall of the tap hole.
  • the arm 4 is provided with a stop 6. (The counter-stop mounted on the wall of the converter is not shown).
  • the cylinder 7 can pivot around an axis integral with the wall of the converter.
  • the plug 3 has the shape of a truncated cone, slightly chamfered.
  • the large base of the truncated cone has a cylindrical recess 14 in which is received a lug mounted on the arm 4 (see also Fig.
  • the plug which is held on the lug by friction is preferably made of an inexpensive, easily machinable and relatively soft material such as wood, preferably fir.
  • the surface of the plug is advantageously covered with a layer of refractory material.
  • Two elements 10 permeable to a bubbling agent are located on either side of the tap hole 2 (see FIG. 3). The optimal place where these elements are placed is preferably determined experimentally for each converter. By positioning them about 0.5 m from the axis of the tap hole, we obtained the expected result for our 150-ton converter.
  • Permeable elements suitable for implementing the invention have been described in patents LU 82.552, LU 82.553, LU 82.554.
  • ⁇ consist of several neighboring elongated segments, of rectangular section, surrounded by a metal box.
  • a distribution chamber 11 On the cold side of the permeable element 10, a distribution chamber 11 is welded to the walls of the box. Conduits 12 connect this chamber 11 to a source 13 of bubbling agent. The bubbling fluid is passed at the interface of the different segments. It follows that the permeable elements 10 create a well distributed flow of fluid.
  • a tube 20 is fixed, on which a base 16 is welded, on the arm 4.
  • a bolt 18 screwed into a ball joint 15 provided with the plug-holding lug ensures, by through the spring 17 and the washer 19, the support of the ball joint 15 on the base 16.
  • the jack 7 can be kept in the extended position, as shown in FIG. 1, to ensure that the plug 3 is held in the mouth of the tap hole 2.
  • the tap hole is preferably always closed, except during the pouring operation. This limits heat loss and prevents the escape of flame and slag during blowing.
  • the jack 7 withdraws the arm 4 until it stops.
  • the plug 3 remains stuck in the tap hole 2.
  • the liquid mass comes into contact with the plug during the tilting and destroys it in a few seconds. At this time the converter is in such a position that only metal is in the immediate vicinity of the tap hole.
  • a new plug 3 is positioned on the lug of the arm 4.
  • the jack 7 is pressurized and the plug is pressed into the tap hole.
  • the plug has a reduced mass, the closure is therefore quick.
  • the cap is relatively soft ; it is able to adapt to the contours of the tap hole.
  • the position of the shutter is preferably adjustable on the axis of the tap hole. It is also noted that since the plug remains stuck respectively held in the taphole between two emptying operations, the use of a second plug is superfluous.
  • the bubbling agent is usefully a neutral gas such as argon, nitrogen or possibly carbon dioxide.
  • a gas flow of 2-3 Nm 3 / hour ensures the permeability of the refractory elements.
  • the gas flow rate is increased to reach 5-10 Nm 3 / hour. Note here that higher flow rates cause projections, which mix with the slag and which are then entrained with it towards the tap hole.
  • an improvement in the ferro-manganese yield ranging from 3 to 7% has been observed for semi-quenched steels, which is equivalent on average to a saving of 0.35 kg / t steel .
  • the number of flows with high rephosphorization, on the order of 0.025% P decreased by more than half, while those with low rephosphorization, on the order of 0.002% P, easily doubled.
  • the number of permeable elements need not necessarily be taken to be two and that the bubbling gases suitable for implementing the invention are not only argon, nitrogen or carbon dioxide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP83630104A 1982-06-18 1983-06-15 Procédé et dispositif pour vidanger des récipients métallurgiques Expired EP0097610B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83630104T ATE20440T1 (de) 1982-06-18 1983-06-15 Verfahren und einrichtung zum entleeren von metallurgischen gefaessen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
LU84213A LU84213A1 (fr) 1982-06-18 1982-06-18 Dispositif pour vidanger des recipients metallurgiques
LU84213 1982-06-18
LU84237A LU84237A1 (de) 1982-06-29 1982-06-29 Vorrichtung zum verschliessen des abstichloches eines metallurgischen gefaesses
LU84237 1982-06-29

Publications (2)

Publication Number Publication Date
EP0097610A1 EP0097610A1 (fr) 1984-01-04
EP0097610B1 true EP0097610B1 (fr) 1986-06-18

Family

ID=26640291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83630104A Expired EP0097610B1 (fr) 1982-06-18 1983-06-15 Procédé et dispositif pour vidanger des récipients métallurgiques

Country Status (15)

Country Link
EP (1) EP0097610B1 (es)
KR (1) KR840005172A (es)
AR (1) AR230796A1 (es)
AU (1) AU1591983A (es)
BR (1) BR8303246A (es)
CA (1) CA1206752A (es)
DD (1) DD209851C4 (es)
DE (1) DE3364174D1 (es)
DK (1) DK280383A (es)
ES (1) ES523380A0 (es)
FI (1) FI831964A7 (es)
HU (1) HU187104B (es)
IN (1) IN157657B (es)
NO (1) NO832200L (es)
PT (1) PT76879B (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211598C1 (es) * 1992-04-07 1993-01-14 Oesterreichische Magnesit Ag, Radenthein, Kaernten, At
DE10117181C1 (de) * 2001-04-05 2002-10-31 Georgsmarienhuette Gmbh Verfahren und Vorrichtung zur Verhinderung des Mitfließens von Schlacke beim Abstich einer Stahlschmelze

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1010787B (it) * 1974-04-08 1977-01-20 Salvagnini M Scaricatore mobile con otturatore per il controllo del flusso dei metalli fusi dai relativi conteni tori azionato con sistema mecca nico pneumatico o elettronico
FR2357318A1 (fr) * 1976-07-06 1978-02-03 Daussan Jean Dispositif pour l'obturation de l'orifice de coulee d'un recipient pour le transvasement d'un metal en fusion
CS241483B2 (en) * 1980-06-25 1986-03-13 Arbed Refractory building body
LU82597A1 (de) * 1980-07-09 1982-02-17 Arbed Feuerfester,gasdurchlaessiger baukoerper

Also Published As

Publication number Publication date
HU187104B (en) 1985-11-28
CA1206752A (fr) 1986-07-02
AR230796A1 (es) 1984-07-31
DK280383D0 (da) 1983-06-17
NO832200L (no) 1983-12-19
EP0097610A1 (fr) 1984-01-04
FI831964L (fi) 1983-12-19
AU1591983A (en) 1983-12-22
BR8303246A (pt) 1983-12-13
FI831964A7 (fi) 1983-12-19
DK280383A (da) 1983-12-19
ES8405444A1 (es) 1984-06-01
PT76879A (fr) 1983-07-01
PT76879B (fr) 1986-01-27
DE3364174D1 (en) 1986-07-24
DD209851C4 (de) 1985-12-18
ES523380A0 (es) 1984-06-01
KR840005172A (ko) 1984-11-05
FI831964A0 (fi) 1983-06-01
IN157657B (es) 1986-05-10
DD209851A5 (de) 1984-05-23

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