EP1728572B1 - Ladle plugging method and applicator device - Google Patents

Ladle plugging method and applicator device Download PDF

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Publication number
EP1728572B1
EP1728572B1 EP06010944A EP06010944A EP1728572B1 EP 1728572 B1 EP1728572 B1 EP 1728572B1 EP 06010944 A EP06010944 A EP 06010944A EP 06010944 A EP06010944 A EP 06010944A EP 1728572 B1 EP1728572 B1 EP 1728572B1
Authority
EP
European Patent Office
Prior art keywords
channel
shell
ladle
valve
casting
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.)
Not-in-force
Application number
EP06010944A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1728572A1 (en
Inventor
Gio Batta Masnata
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1728572A1 publication Critical patent/EP1728572A1/en
Application granted granted Critical
Publication of EP1728572B1 publication Critical patent/EP1728572B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1536—Devices for plugging tap holes, e.g. plugs stoppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/44—Consumable closure means, i.e. closure means being used only once
    • B22D41/46—Refractory plugging masses
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/12—Opening or sealing the tap holes
    • 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
    • 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
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag

Definitions

  • This invention relates to a method for preparing a ladle for a cycle of filling and casting of molten metal and in particular steel and allowing avoiding obstruction of the casting channel of the ladle during the process.
  • This invention also relates to a device for implementing said method.
  • the mixture is poured by the worker into the casting channel on the bottom of the ladle from the upper inlet opening of the molten steel and does not always go to appropriately occupy the channel so that the obstruction phenomenon is not always opposed in a satisfactory manner and with a certain frequency the solid plug preventing flow of the molten steel can still form.
  • the operation is also long and awkward and calls for intervention of specialized workers.
  • the general purpose of this invention is to remedy the above-mentioned shortcomings by making available a method for preparing a ladle for a filling and casting cycle allowing limiting to a minimum the possibility of obstruction of the casting channel of the ladle during processing and avoiding creation of situations dangerous for the workers of the mill.
  • Another purpose is to make available a simple and economical device for implementation of said method.
  • a device for application of a refractory substance with fluid behavior in the casting channel of a ladle closed by a plugging valve comprising means of feeding the substance to a pistol provided with a distributor designed to be inserted into the passage of the valve to reach with its injection end the outlet of the channel with there being provided at said injection end means of connection for engagement with an inlet opening of a starting cartridge comprising a flexible shell designed to receive the substance coming from the distributor inside the channel.
  • a cartridge designed to be inserted in the casting channel of a ladle through the plugging valve of the channel before filling of the ladle with molten metal and comprising a deformable shell having maximum volume nearly equal to or greater than the volume of the channel with the shell being provided with an opening through which once inserted in the channel it is designed to be filled with a refractory substance with fluid behavior until its walls do not adhere to the channel wall.
  • FIG 1 shows a ladle 11 provided with side walls 12a and 12b, an upper opening 62 for receiving the molten steel from the furnace (not shown) and a bottom wall 61.
  • the ladle 11, shown empty before the casting cycle, is supported with the side wall 12a on a support 60 so that the bottom wall 61 is vertical.
  • the casting channel 27 is made opposite a wall part denominated 'seat-holding block'.
  • a plugging (or casting) valve 14 made like a valve in accordance with techniques known in the steel-mill field.
  • the ladle 11 also comprises a pin 40 shown diagrammatically in broken lines and designed to engage with appropriate hooking means used for its movement in the mill and its rotation.
  • FIG 1 also shows a worker 13 holding in his hand a pistol 17 at the outlet end of which is fastened a cartridge 16 in the form of a sack with flexible wall and designed to be filled with a mixture of refractory substances with uncompressible fluid behavior once inserted in the casting channel.
  • the refractory substances as set forth below, have the function of preventing deposit of metal on the walls of the casting channel 27 of the ladle, preventing the molten from occupying its space during filling of the ladle.
  • the substances could comprise a refractory powder (for example, of graphite), in prior art use for filling the casting channel.
  • the pistol 17 is connected through a tube or hose 24 to the pneumatic device 18 which has the function of injecting through the pistol inside the cartridge 16 the starting mixture coming from a special single-dose container 19 using the pneumatic energy supplied by a source of compressed air at the inlet 25.
  • FIG 2 shows an enlargement of the pistol 17, the cartridge 16, the valve 14 of the ladle (shown diagrammatically) and the casting channel 27.
  • the pistol 27 which receives the starting mixture from the hose 24 comprises a portion 23 on which are provided mixture injection operating means, a grip 20 and a distributor 21 shaped with an elongated form so as to be insertable into the passage 63 in the valve 14.
  • the distributor 21 conveys the starting mixture into the shell 16a of the cartridge 16 which is fastened to the sleeve 29 of the cartridge by means of a clamp 30 opposite an inlet opening thereof for the powders.
  • the sleeve 29 is fastened to the front end of the distributor 21 by means of appropriate hooking means (shown diagrammatically in FIG 2b ) before insertion of the cartridge in the ladle.
  • a striker 22 designed to go and rest against the valve 14 when the cartridge has reached the right position in the casting channel.
  • the shell 16a of the cartridge 16 is made of a deformable material such as to allow the shell to swell when the mixture of refractory substances is injected into it.
  • the shell material is heat-resistant to withstand the relatively high temperatures of the casting channel 27 before beginning filling of the ladle. This allows operating even without complete cooling of the ladle, with benefit in the thermal balance of the casting operations and saving of waiting time for cooling.
  • the shell could be made of a fiber-glass cloth resistant up to a temperature of even 600°C to 700°C. The higher the temperature to which the shell will resist, the shorter will be the time of waiting between the end of a casting and the next filling. By conventional methods, it was necessary to wait a long time before the ladle was sufficiently cold to allow the worker to apply the mixture in the casting channel from the inside of the ladle.
  • the shell could even be made with plastic materials having high melting temperature and possibly even air-permeable.
  • the valve 14 shown open in FIG 2 is fastened to the outer face of the bottom wall 61 of the ladle and comprises a fixed pierced plate 26 on the side towards the ladle and a movable pierced plate 25 handled by means of the cylinder 31.
  • the valve 14 also comprises an elongated nozzle downstream from the movable plate and forming the passage 63 aligned with the casting channel 27 in the bottom wall 61.
  • FIG 2b shows the pistol 17 before the cartridge 16 is fastened to its end 80.
  • coupling means shown diagrammatically suited for engaging on the sleeve and on the clamp of the cartridge 16 to hold the shell 16a in the correct position during injection of the starting mixture and avoid the injection stream's pushing the cartridge towards the inside of the ladle.
  • the sleeve 29 could advantageously form an escape path for the transport air, for example with a porous air-permeable portion but such as to withhold the refractory powder.
  • FIG 3 shows the pistol 17 with the distributor 21 inserted in the passage inside the valve 14 and the cartridge 16 still empty inside the casting channel 27.
  • the pistol is pushed by the worker until the striker 22 goes to rest on the lower end of the valve 14 and the cartridge 16 is arranged entirely beyond the movable plate 25 of the valve.
  • the length of the distributor 21 is indeed sized according to the longitudinal extension of the valve 14 to terminate with its end at the height of the fixed plate 26 of the valve.
  • the cartridge 16 is sized according to the dimensions of the channel 27 to occupy it along its entire length.
  • the shell of the cartridge has its maximum volume not less than the volume of the casting channel 27 to have a correct and complete filling of the channel with the starting mixture and avoid molten metal penetrating into the channel before the beginning of the casting and being deposited there by solidification.
  • FIG 4 shows the mixture injection step.
  • the shell 16a receives the powder and swells to go and occupy all the volume of the casting channel and possibly also the bordering zones inside the ladle.
  • the walls of the shell go to adhere to the walls of casting channel 27.
  • the coupling means at the end of the distributor 21 appropriately hold back the cartridge 16 in the correct position in the channel in this step.
  • the injection takes place with the ladle still rotated with the casting channel arranged horizontally.
  • the pistol 17 is extracted from the valve 14 by tearing the sleeve 29 from the shell 16a of the cartridge which remains well jammed in the channel.
  • the means of coupling to the end 80 of the manifold can comprise a hook which acts on the clamp 30 when the pistol is drawn from the valve, propitiating separation of the sleeve 29 from the shell 16a.
  • valve 14 is closed as shown in the figure.
  • the ladle is now raised and rotated vertically using the pin 40 and is positioned beneath a furnace and is ready to begin the filling cycle and the subsequent casting of the molten metal.
  • FIG 6 shows the step in which the molten steel 42 is poured from the furnace 41 to the inside of the ladle 11 with the valve 14 closed.
  • the mixture in the cartridge 16 remains well positioned in the channel 27 and prevents the metal from reaching that zone of the ladle for all the time necessary for its filling, without however spreading into other zones of the ladle.
  • the mixture carries out its main function i.e. avoiding deposit of metal on the walls of the channel.
  • the material making up the shell could be partly destroyed by the effect of the high temperature reached in this step.
  • the ladle After the ladle has been filled, it is taken to the casting station, which can comprise for example, an ingot mold in accordance with known techniques in the steel mill field.
  • the valve 14 is then opened and initially all the mixture, under the pressure of the molten metal in the ladle, comes out of the channel, after which casting of the molten steel begins.
  • the mixture of refractory substances is distributed over all the width of the channel to cause adherence of the starting cartridge walls to those of the channel and adapting perfectly to the flared form typical of casting channels.
  • the adduction of the powders in the cartridge could be secured with any known technique even as an alternative to air flow transportation as illustrated previously.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Silicon Compounds (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP06010944A 2005-06-03 2006-05-26 Ladle plugging method and applicator device Not-in-force EP1728572B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001039A ITMI20051039A1 (it) 2005-06-03 2005-06-03 Metodo per la preparazione di una siviera ad un ciclo di riempimento e di colata e dispositivo per attuare tale metodo

Publications (2)

Publication Number Publication Date
EP1728572A1 EP1728572A1 (en) 2006-12-06
EP1728572B1 true EP1728572B1 (en) 2008-07-09

Family

ID=36942247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06010944A Not-in-force EP1728572B1 (en) 2005-06-03 2006-05-26 Ladle plugging method and applicator device

Country Status (4)

Country Link
EP (1) EP1728572B1 (it)
AT (1) ATE400384T1 (it)
DE (1) DE602006001688D1 (it)
IT (1) ITMI20051039A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI120385B (fi) * 2007-07-06 2009-10-15 Indref Oy Sulkumekanismi sulan metallin annostelemiseksi ja menetelmä sulkumekanismin valmistamiseksi

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ280990A (en) * 1995-02-16 1997-11-24 Laporte Group Australia Ltd Casting ladle device; apparatus and method for inserting sand into the nozzle and base portions of a ladle, elongate tool introduces sand filled container via nozzle orifice

Also Published As

Publication number Publication date
ATE400384T1 (de) 2008-07-15
EP1728572A1 (en) 2006-12-06
DE602006001688D1 (de) 2008-08-21
ITMI20051039A1 (it) 2006-12-04

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