WO1986004980A1 - Appareil et procede de transfert d'une quantite predeterminee de metal liquide d'un bac contenant un bain de metal en fusion dans un conteneur de reception - Google Patents

Appareil et procede de transfert d'une quantite predeterminee de metal liquide d'un bac contenant un bain de metal en fusion dans un conteneur de reception Download PDF

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Publication number
WO1986004980A1
WO1986004980A1 PCT/EP1986/000069 EP8600069W WO8604980A1 WO 1986004980 A1 WO1986004980 A1 WO 1986004980A1 EP 8600069 W EP8600069 W EP 8600069W WO 8604980 A1 WO8604980 A1 WO 8604980A1
Authority
WO
WIPO (PCT)
Prior art keywords
discharge flow
flow pipe
molten metal
outlet opening
metal bath
Prior art date
Application number
PCT/EP1986/000069
Other languages
English (en)
Inventor
Ralph Weber
Original Assignee
Kortec Ag
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 to IN733/CAL/85A priority Critical patent/IN164135B/en
Application filed by Kortec Ag filed Critical Kortec Ag
Priority to HU863047A priority patent/HU196497B/hu
Priority to BR8605562A priority patent/BR8605562A/pt
Priority to IN112/CAL/86A priority patent/IN164059B/en
Publication of WO1986004980A1 publication Critical patent/WO1986004980A1/fr

Links

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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material

Definitions

  • the invention relates to an apparatus for transferring a predetermined amount of liquid metal fr ⁇ n a vessel containing a molten metal bath, in particular a furnace vessel, into a receiving container, by means of a discharge flow pipe having a refractory lining.
  • the invention further relates to a process using such an apparatus.
  • the floor of a portion of an electric arc furnace which projects out in a bay window-like configuration, is provided with a tapping hole which can be closed fr ⁇ n beneath by means of a pivotable plate and which is lined with a refractory tube.
  • a filling mass of refractory material is provided in the tapping hole.
  • the closure plate is pivoted to the side thereby opening the tapping hole.
  • the jet of metal passes over a short distance into a ladle which is beneath the tapping hole.
  • the vessel of the arc furnace is tilted and in that way the tapping operation is terminated, with the slag that floats on the molten metal bath being retained in the furnace vessel.
  • That procedure for transferring a predetermined amount of liquid metal fr ⁇ n a vessel into a receiving container presupposes equipment for tipping the furnace vessel, which is relatively expensive particularly when dealing with vessels of larger sizes.
  • the tipping operation takes a number of minutes, having regard to the large masses to be moved.
  • the object of the present invention in an apparatus of the kind set forth in the opening part of this specification, is to permit transfer of a predetermined amount of the molten metal into a receiving container without the vessel having to be tipped.
  • the invention seeks to make it possible in that connection to retain the slag that floats on the molten metal bath, in the vessel.
  • the invention further 1 seeks to make it possible to protect the flow of metal, as it passes into the receiving container, fr ⁇ n being attacked by the free atmosphere.
  • the invention seeks to provide that discharge of the liquid metal from the vessel can be immediately interrupted if required.
  • connection makes use of the principle of a liquid siphon, that is to say, the pressure difference between the intake and the outlet of a conduit.
  • connection measures are provided such that the flow of metal can be securely and safely started and can be instantly interrupted, and the slag that floats on the molten metal bath in the vessel is retained.
  • connection the flow of metal is guided within a pipe almost over the entire distance between the vessel and the receiving container so that the metal is protected fr ⁇ n attack by the free atmosphere. Oxygen is virtually completely prevented fr ⁇ n having access to the metal by means of a protective curtain of inert gas in the region of the point at which the flow of metal issues fr ⁇ n the pipe.
  • Figure 1 is a basic diagrammatic view of an enbodiment of the invention
  • Figure 2 is a view in section of a portion of Figure 1
  • FIG. 3 is a basic diagrammatic view of a second embodiment of the invention. Modes for Carrying Out the Invention
  • FIGS 1 axfi 2 show an apparatus with a vessel 1 which contains a molten metal bath 2.
  • the vessel 1 may be an arc furnace, in particular the portion of an arc furnace which projects in a bay window-like configuration, a heating or soaking furnace, a ladle or another vessel which contains, liquid metal, in particular liquid steel.
  • a receiving container 3 such as a ladle truck or another container
  • the arrangement has a discharge flow pipe 4 in the form of an inverted U having two downwardly pointing limbs 5 and 6. Of those limbs, the first limb 5 has an intake opening 7 while the second limb 6 has an outlet opening 8 which is lower than the intake opening 7.
  • the outlet opening 8 of the discharge flow pipe 4 is gas-tightly closed by a closure means 9 and in addition the intake opening 7 of the discharge flow pipe 4 is closed off by a plate member 10 which cc prises a material whose melting point is below the temperature of the molten metal bath 2.
  • the plate member 10 serves to ensure, when the first limb 5 of the discharge flow pipe 4 dips into the vessel 1, that slag floating on the molten metal bath 2 cannot penetrate into the discharge flow pipe, the layer of slag being indicated at 11.
  • the plate member 10 it is advantageous for the plate member 10 to be of a wedge-like or frustoconical configuration so that the end of the pipe which is closed by the plate member 10 can pass through the layer of slag, without entraining slag therewith.
  • the discharge flow pipe 4 includes a steel casing 12 and a refractory lining 13.
  • it is made up of a plurality of pipe portions which are gas-tightly joined together.
  • the steel casings of the pipe portions may be for example welded together or they may be connected by sealed annular flanges.
  • the first limb 5 has a refractory cladding 13a.
  • a pipe connection 14 which has a refractory lining is provided in the upper region of the discharge flow pipe 4, in the illustrated embodiment in the region joining the limbs 5 and 6 thereof.
  • the connection 14 is connected to a flexible gas line 15 which can be selectively connected to a vacuum means 17 by way of a first valve 16 or communicated by way of a second valve 18 to the free atmosphere.
  • the vacuum means includes a vacuum pump 19, a vacuum storage means 20 and a pressure measuring device 30.
  • the capacity of the vacuum storage means 20 approximately corresponds to thirty times the capacity of the discharge flow pipe including the conduits as far as the valves 16 and 18.
  • a gas cooler 34 Disposed upstream of the vacuum storage means is a gas cooler 34 whose function is to remove dust fr ⁇ i and to cool the gas which is sucked out by the vacuum means, from the discharge flow pipe 4. It includes a chamber 35 with a coolin coil 36. When the hot gas which has been sucked out by the vacuum means passes into the chamber, the gas can expand because of the abrupt substantial increase in the flow cross-section. The gas drops in temperature when that occurs and in heat exchange relationshi with the cooling coil 36. In addition, the reduction in the flow • speed causes the dust which is entrained with the flow of gas to be separated out. As shown in Figure 1, the receiving container 3 is disposed on a weighing means 21 for measuring the amount of metal which is introduced into the receiving container 3.
  • the closure means 9 for the outlet opening 8 of the discharge flow pipe 4 includes a closure plate 23 which is provided with an annular seal 22 and which is movable from a closure position in which it bears against the edge of the outlet opening 8, as shown in Figure 2, into an open position (not shown) in which the outlet opening 8 is open.
  • the closing and opening movements are produced by a drive means 24 which is shown in diagrammatic form.
  • the steel casing 12 is provided at the discharge end of the discharge flow pipe 4 with an annular flange 31 which, within the surface that presses against the annular seal 22, has an annular groove 32 which c ⁇ nmunicates with at least one small pipe 33.
  • the annular groove may be connected by way of the pipe 33 and by a conduit (not shown) to a vacuum source whereby, in the closed position of the closure plate 23, that is to say, when the annular seal 22 is pressed against the annular flange 31, it is possible to • provide a vacuum-tight connection between the annular flange 31 and the annular seal 22 which is fixed on the closure plate 23. If such a vacuum closure arrangement is not used, the arrangement does not always guarantee that the annular seal 22 is pressed vacuum- tightly against the annular flange 31.
  • Granular refractory material 25 is disposed above the closure plate, to a height of about 300 mm.
  • the material 25 serves to protect the closure plate 23 fr ⁇ n direct contact with the liquid metal.
  • a gas-tightly closable filling connection 26 is provided at the upper end of the second limb 6.
  • a valve 27 Connected to the connection 26 by way of a valve 27 is a container (not shown) for granular refractory material, having a metering means,
  • the connection 26, like the connection 14, must be provided with a refractory lining to a height that the liquid metal can reach in the suction operation performed by the vacuum means.
  • the flow cross-section of the discharge flow pipe 4 is reduced in the fashion of a venturi tube at a location 28 just upstream of the outlet opening 8 in order to increase the flow speed at that location and to ensure that air cannot penetrate into the discharge flow pipe 4 when the closure plate 22is removed while the liquid metal is flowing out.
  • annular pipe 29 provided at the lower end of the second limb 6 of the discharge flow pipe 4, on the outside thereof, is an annular pipe 29 having downwardly facing openings which are distributed around the periphery thereof and which can provide a protective gas enclosure around the jet issuing fr ⁇ n the discharge flow pipe in order to protect it fr ⁇ n an oxidising effect fr ⁇ n the ambient air.
  • the refractory lining 13 of the discharge flow pipe is not subjected to a thermal shock when it is put into use and in order to ensure that the metal does not freeze on to the discharge flow pipe while it is being conveyed therethrough, the refractory lining is preheated by means of gas, oil or electrical power.
  • the closure plate 23 of the closure means 9 is moved into the closure position by actuation of the drive 24 and the annular groove 32 is connected to the vacuum source which is provided for that purpose, for example the vacuum storage means 20.
  • a predetermined amount of granular refractory material 25 is introduced by opening the valve 27. Thereafter the valve 27 is closed again and the plate member 10 is moved into position at the intake opening 7 of the discharge flow pipe 4. After those preparatory steps, the discharge flow pipe 4 is dipped with its first limb to the desired depth into the molten metal bath 2 in the vessel 1. That position is shown in Figure 2. When it passes through the layer of slag 11, the plate member 10 ensures that slag cannot pass into the interior of the discharge flow pipe 4. After a few seconds, the plate member 10 which preferably comprises the same material as the molten metal in order to prevent contamination melts and the liquid metal passes upwardly into the discharge flow pipe, to approximately the level of the surface of the metal bath in the vessel 1.
  • the valve 16 When the time has come for tapping the vessel 1 or for transferring the liquid metal to the receiving container 3, the valve 16 is opened, with the valves 18 and 27 still being closed, whereby, as the system is gas-tightly closed off and atmospheric pressure acts on the molten metal bath 2 in the vessel 1, the liquid metal is sucked in by virtue of the vacuum through the gas line 15 and, when that occurs, the entire discharge flew pipe is filled as far as the granular refractory material as well as a part of the connection 14 and a part of the connection 26. That suction operation occurs suddenly by virtue of the vacuum storage means 20. In that stage of operation, the vacuum will drop fr ⁇ n about 98% to about 95%.
  • the vacuum pump 19 continues to be operated during the transfer operation in order to remove any gases which may be developed and which may accumulate in the system. In that operation, the gases which are sucked away are cooled down and dust is removed therefrom, in the gas cooler 34.
  • a curtain of protective gas can be formed around the jet of liquid metal and above the surface of the bath in the receiving vessel 3 by feeding inert gas to the annular conduit 29.
  • the amount of liquid metal which is introduced into the receiving container 3 is measured by the weighing means 21.
  • FIG. 3 diagrarraratically shows the operation of tapping fr ⁇ n a melting vessel such as for example an arc furnace la.
  • Water-cooled elements 38 which form the upper vessel are fitted in position on a hearth 37 of the vessel la. At the top the vessel la is closed by a cover 39.
  • the water-cooled element 38 which is shown on the right in the sectional view in Figure 3 has a closable opening 40 through which the first limb 5 of a discharge flow pipe 4a can be inserted, the discharge flow pipe being in the form of an inverted V.
  • the discharge flow pipe 4a is of the same construction as the discharge flow pipe 4 in the first embodiment.
  • the limb 5, as shown in Figure 3 is inserted into the vessel la through the opening 40 until the intake opening 7 of the discharge flew pipe dips into the molten metal bath 2 and then a predetermined amount of liquid metal is transferred fr ⁇ n the vessel la into the receiving container 3 in the same manner as in the case of the first embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Furnace Details (AREA)

Abstract

Dans le but de transférer une quantité prédéterminée de métal liquide d'un bac (1) contenant un bain de métal en fusion (2) dans un conteneur de réception (3), on utilise un tube d'écoulement par refoulement (4) ayant une doublure réfractaire et une forme de U ou V inversé avec deux membres pointant vers le bas (5, 6), le premier membre ayant une ouverture d'entrée et le second membre ayant une ouverture de sortie pour le métal liquide, laquelle ouverture de sortie peut être fermée de manière étanche au gaz par des moyens de fermeture. Dans la région supérieure du tube d'écoulement par refoulement (4) se trouve une connexion de tube (14) qui possède une doublure réfractaire et qui peut communiquer avec des moyens à vide (19, 20). Le tube d'écoulement par refoulement est immergé avec son premier membre (5) dans le bain de métal en fusion (2) et le métal liquide est retiré d'après le principe d'un siphon de liquide.
PCT/EP1986/000069 1985-02-20 1986-02-13 Appareil et procede de transfert d'une quantite predeterminee de metal liquide d'un bac contenant un bain de metal en fusion dans un conteneur de reception WO1986004980A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
IN733/CAL/85A IN164135B (fr) 1985-02-20 1985-10-15
HU863047A HU196497B (en) 1985-02-20 1986-02-13 Discharge pipe for furthering liquid metal from tank containing smelting bath into receiving tank and apparatus and method for furthering metal of prescribed amount by use of discharge pipe
BR8605562A BR8605562A (pt) 1985-02-20 1986-02-13 Aparelho e processo para transferir uma quantidade predeterminada de metal liquido de um recipiente contendo um banho de metal liquido para o interior de um recipiente coletor
IN112/CAL/86A IN164059B (fr) 1985-02-20 1986-02-17

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3505844.7 1985-02-20
DE3505844 1985-02-20

Publications (1)

Publication Number Publication Date
WO1986004980A1 true WO1986004980A1 (fr) 1986-08-28

Family

ID=6263026

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1986/000069 WO1986004980A1 (fr) 1985-02-20 1986-02-13 Appareil et procede de transfert d'une quantite predeterminee de metal liquide d'un bac contenant un bain de metal en fusion dans un conteneur de reception

Country Status (7)

Country Link
EP (1) EP0211952A1 (fr)
BR (1) BR8605562A (fr)
DE (1) DE8504755U1 (fr)
HU (1) HU196497B (fr)
IN (2) IN164135B (fr)
TR (1) TR23406A (fr)
WO (1) WO1986004980A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000060297A1 (fr) * 1999-04-01 2000-10-12 Arcmet Technologie Gmbh Cuve metallurgique dotee d'un dispositif de coulee et procede de soutirage commande et sans scories de metal liquide de cette cuve
WO2004074524A1 (fr) * 2003-02-22 2004-09-02 Noel Alfred Warner Siphon a metal en fusion equipe de dispositifs de chauffage interne et externe
CN103363809A (zh) * 2013-07-25 2013-10-23 深圳市劲拓自动化设备股份有限公司 一种液态金属真空抽取装置及抽取方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU611918B2 (en) * 1987-06-24 1991-06-27 Philip Martin Jones A syphon tube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE113574C (fr) *
DE605701C (de) * 1934-11-17 Armin Wachsmuth Saugheber zum Entleeren von thermischen Baedern
CH420236A (de) * 1962-04-19 1966-09-15 Krupp Ag Huettenwerke Verfahren und Vorrichtung zum Regeln des Mengenflusses bei der Abstichentgasung von Metallen
FR1492043A (fr) * 1966-02-18 1967-08-18 Purmetall Werner Funke Fa Séparateur de scories pour une installation de dégazage par le vide
FR2139824A1 (fr) * 1971-06-03 1973-01-12 Properzi Ilario
FR2555719A1 (fr) * 1983-11-24 1985-05-31 Clecim Sa Dispositif de fermeture d'un trou de coulee

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE113574C (fr) *
DE605701C (de) * 1934-11-17 Armin Wachsmuth Saugheber zum Entleeren von thermischen Baedern
CH420236A (de) * 1962-04-19 1966-09-15 Krupp Ag Huettenwerke Verfahren und Vorrichtung zum Regeln des Mengenflusses bei der Abstichentgasung von Metallen
FR1492043A (fr) * 1966-02-18 1967-08-18 Purmetall Werner Funke Fa Séparateur de scories pour une installation de dégazage par le vide
FR2139824A1 (fr) * 1971-06-03 1973-01-12 Properzi Ilario
FR2555719A1 (fr) * 1983-11-24 1985-05-31 Clecim Sa Dispositif de fermeture d'un trou de coulee

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000060297A1 (fr) * 1999-04-01 2000-10-12 Arcmet Technologie Gmbh Cuve metallurgique dotee d'un dispositif de coulee et procede de soutirage commande et sans scories de metal liquide de cette cuve
US6596221B1 (en) 1999-04-01 2003-07-22 Arcmet Technologie Gmbh Metallurgical vessel having a tapping device and method for the controlled, slag-free extraction of molten metal from said vessel
AU763426B2 (en) * 1999-04-01 2003-07-24 Arcmet Technologie Gmbh Metallurgical vessel comprising a tapping device and method for the controlled, slag-free extraction of molten metal from said vessel
CZ297606B6 (cs) * 1999-04-01 2007-02-07 Arcmet Technologie Gmbh Metalurgická nádoba s odpichovým zarízením
WO2004074524A1 (fr) * 2003-02-22 2004-09-02 Noel Alfred Warner Siphon a metal en fusion equipe de dispositifs de chauffage interne et externe
CN103363809A (zh) * 2013-07-25 2013-10-23 深圳市劲拓自动化设备股份有限公司 一种液态金属真空抽取装置及抽取方法
CN103363809B (zh) * 2013-07-25 2015-07-15 深圳市劲拓自动化设备股份有限公司 一种液态金属真空抽取装置及抽取方法

Also Published As

Publication number Publication date
BR8605562A (pt) 1987-04-22
IN164059B (fr) 1989-01-07
TR23406A (tr) 1989-12-29
IN164135B (fr) 1989-01-21
HU196497B (en) 1988-11-28
DE8504755U1 (de) 1986-08-28
EP0211952A1 (fr) 1987-03-04
HUT42844A (en) 1987-08-28

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