WO1987007306A1 - Ameliorations dans la production de l'acier - Google Patents

Ameliorations dans la production de l'acier Download PDF

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Publication number
WO1987007306A1
WO1987007306A1 PCT/GB1987/000362 GB8700362W WO8707306A1 WO 1987007306 A1 WO1987007306 A1 WO 1987007306A1 GB 8700362 W GB8700362 W GB 8700362W WO 8707306 A1 WO8707306 A1 WO 8707306A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
modifying agent
injection
sliding gate
iron
Prior art date
Application number
PCT/GB1987/000362
Other languages
English (en)
Inventor
David William Stamp
James Kennedy
Original Assignee
British Steel Corporation
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 British Steel Corporation filed Critical British Steel Corporation
Priority to EP87903375A priority Critical patent/EP0268632B1/fr
Priority to DE3752209T priority patent/DE3752209D1/de
Publication of WO1987007306A1 publication Critical patent/WO1987007306A1/fr

Links

Classifications

    • 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
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection
    • 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
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron

Definitions

  • This invention relates to the production of iron, for casting and more particularly, the production of quasi-fla e and spheroidal graphite iron.
  • quasi-fla e and spheroidal graphite irons are hereinafter referred to as "modified iron”.
  • modified iron It is known to form modified iron by introducing into liquid iron, graphite modifying elements, alloys or mixtures ⁇ , containing singly or in combination, the elements magnesium, cerium, calcium, sodium, yttrium and lithium. Any such additive is hereinafter referred to as a "modifying agent".
  • a modifying agent Any such additive is hereinafter referred to as a "modifying agent”.
  • an innoculating element usually silicon, may be contained in the modifying agent or added separately, in which case it is hereinafter referred to as an
  • inoculating agent In the case of quasi-flake, this is usually preceded by the addition to the molten iron of a material such as a ferrotitanium alloy.
  • proposals to add magnesium in the form of a briquette from above to the molten iron in a containing vessel usually involves a most violent reaction adjacent the surface in which a very high percentage (frequently more than 50 ⁇ ) of the magnesium does not, in fact, become absorbed in the iron but is lost by the severity of the reaction through the surface of the melt to the atmosphere.
  • a process for the production of modified iron comprising the steps. of containing the iron in molten form, in a prepared state for modifying, in a containing vessel having a sliding gate valve mounted in a wall thereof at or adjacent the base thereof, the sliding gate valve having an opening in the sliding gate connected to a source of modifying agent containing material and selectively movable into and out of alignment with an orifice through the wall of the vessel and comprising the steps of moving the gate so that modifying agent containing material is injected entrained in an inert gas through said opening therein into the orifice in the wall of the vessel for the formation of modified iron therein.
  • the process may incorporate a sliding gate valve intended for the discharge of metal from the vessel therethrough in which case at least two openings pass through the sliding gate of the valve for separate alignment with the orifice through ⁇ the wall of the vessel to enable discharge of metal from the vessel through one opening in addition to the injection of the modifying agent containing material through the other opening.
  • the process may incorporate a sliding gate valve used solely for the purpose of gas and gas-solids injection, discharge of the metal being by means well known to the art, for example, lip or teapot spout teeming or stopper rod teeming.
  • the process of the present invention may include, as an initial step, the provision of a mass of powdered or granular refractory material in the well in the wall of the vessel above the orifice and the valve prior to the filling of the vessel with the molten iron, and blowing a gas into the well prior to the injection of the modifying agent containing material such as to displace the refractory filler therefrom.
  • the filler material may be blown from the well in the wall of the vessel by means of a gas through a melt discharge opening of the sliding gate valve or through the inlet opening for the modifying agent containing material.
  • injection of the gas to clear the filler material may be by means of a tuyere extending within the thickness of a fixed plate of the sliding gate valve into the relevant well space.
  • a gas channel can be provided through a refractory brick of the wall of the metal vessel into the opening.
  • gas bubbling through the bottom orifice of a kind often used for stirring and other purposes in molten metal processes is, with the operation of the invention, to be avoided or at least reduced to a minimum during at least the majority of the operation, since such bubbling will tend to take the entrained modifying agent containing material to the surface of the melt where it can be lost to the atmosphere. Nevertheless it has been found advantageous to gas bubble for an optimum period of one half to two minutes at up to 50 Nl/min to effect separation of desulphurisation-deoxidation products, if temperature permits.
  • the modifying agent can be pneumatically conveyed into the liquid iron with low gas flow rates because of the attainment of high gas velocities and, hence, powder velocities which prevent metal ingress into the tuyere during the injection.
  • Typical gas flow rates used in this case would be 300 - 450 Nl/min, depending on the required powder flow rate.
  • the efficiency of the operation of the invention is ensured by maintaining a slow injection of the modifying agent containing material whereby the potentially violent reaction of the modifying agent with the iron can be contained without creating unduly disturbed conditions within the melt and therefore loss through the surface of the modifying agent.
  • magnesium injection rates in the range 3-6kg/minute can be satisfactory. Such rates compare with injections into steel for desulphurisation , for example, through a lance injection system of 50kg/minute. It is to be noted that the gas/solid ratio can be directly comparable to injection for desulphurisation, which is known in the art.
  • a typical injection commencement temperature for large section o o castings would be in the range 1290 C to 1340 C, an o injection termination temperature range of 1270 to o o
  • the magnesium containing material may be of any convenient nature such as a magnesium-lime granular mixture or magnesium-alumina-aluminium mix, or an alloy in granular form typical of those presently used for S G iron production, e.g. an Fe-Si-Mg alloy.
  • the modifying agent whether based on magnesium, calcium, sodium, yttrium or lithium is preferably in finely divided form, e.g.
  • the invention utilising sliding gate valves in or adjacent the base of a vessel has considerable advantage over earlier arrangements for injecting modifying agent containing materials into iron for its modification.
  • the level of injection is the maximum possible below the surface of the melt, thereby ensuring maximum efficiency capability and minimum loss of the reactive or low boiling point modifying agent.
  • the ladle depth is typically 2.0 metres and therefore the lance injection depth will be 1.6-1.9 metres, depending on the type of lance used.
  • the point of entry of the modifying agent will be typically 2.4 metres below metal level; the additional 0.5 m corresponding to the length of the channel formed by the well block and inner nozzle above the injection point in the sliding gate plate and the injection lance outlet to ladle floor distance.
  • the powder flow is usually started before immersion and is maintained until after the lance is withdrawn from the vessel.
  • the powder is injected and terminated under an already established metal head thereby conserving high value injection materials.
  • the material resulting in quasi flake iron had a ferro titanium alloy added to the vessel before injection of the magnesium.
  • the absorption efficiency of the injected magnesium is around 70$ or above.
  • the table also illustrates a further advantage of the process in the ability to produce irons with trace sulphur levels (0.002* S) from a high initial sulphur content which is significantly lower than those resulting from many present iron magnesium modification techniques.
  • Figure 1 is a side elevation showing a sliding gate valve for modifying agent injection only, prior to injection usage
  • Figure 2 shows the arrangement of Figure 1 in its injecting mode
  • Figure 3 is a sectional elevation of an injection and discharging sliding gate assembly mounted in the base of a ladle shown in its injection mode;
  • Figure 4 is a sectional elevation of a variant of the assembly of Figure 3.
  • the base wall 22 and lining 28 of an iron containing ladle are provided with a refractory upper nozzle insert 23 carrying a tuyere block 24 through which passes an inner tuyere 25.
  • a lower nozzle block 26 is located in the wall 22 and engages with the static plate 27 of the sliding gate valve assembly 12.
  • a sliding plate 29 carries an injection tuyere 30 connecting with a source of injecting modifying agent material incorporating magnesium (not shown).
  • a well 31 formed in the lining 28 and the upper nozzle 23 above the inner tuyere 25 are filled with filler material 32 which also fills the tuyere 25.
  • the inner tuyere 25 and well 31 is filled to overflow with filler material with the gate 12 in the closed position.
  • the ladle is then filled with molten iron.
  • gas is supplied to the tuyere 30 and then this is indexed in the direction of arrow 13 of Figure 1 so that it aligns with the inner tuyere 25 as shown in Figure 2 and blows out the filler material 32.
  • the plate is then indexed to align the inner nozzle 6 with the pouring nozzle 5 so that the iron, either in 5 the form of quasi flake or spheroidal graphite is poured from the vessel through the nozzle 5.
  • any convenient tuyere configuration can be used, e.g. multi-hole, multiple or concentric.
  • the ladle may incorporate a lid with facilities for fume extraction or, alternatively, the lid may provide a pressure tight seal to allow modifying agent vapour to increase pressure above the melt thereby increasing modifying agent recovery or efficiency as is well known in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Compounds Of Iron (AREA)

Abstract

Procédé de production d'acier modifié consistant à verser l'acier à l'état de fusion, dans un état prêt à être modifié, dans une cuve dont une paroi est pourvue d'une vanne à registre montée au niveau de la base ou à proximité de celle-ci. Le registre de ladite vanne présente une ouverture qui est reliée à une source de matériau contenant un agent modificateur et qui peut être déplacée de manière sélective pour se trouver en alignement ou hors alignement avec un orifice à travers la paroi de la cuve. Le procédé consiste également à déplacer le registre de sorte que le matériau contenant l'agent modificateur soit entraîné par injection dans un gaz inerte par ladite ouverture dans l'orifice de la paroi de la cuve pour produire à l'intérieur de celle-ci l'acier modifié.
PCT/GB1987/000362 1986-05-29 1987-05-27 Ameliorations dans la production de l'acier WO1987007306A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP87903375A EP0268632B1 (fr) 1986-05-29 1987-05-27 Ameliorations dans la production de l'acier
DE3752209T DE3752209D1 (de) 1986-05-29 1987-05-27 Herstellung von gusseisen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8613106 1986-05-29
GB868613106A GB8613106D0 (en) 1986-05-29 1986-05-29 Production of iron

Publications (1)

Publication Number Publication Date
WO1987007306A1 true WO1987007306A1 (fr) 1987-12-03

Family

ID=10598646

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000362 WO1987007306A1 (fr) 1986-05-29 1987-05-27 Ameliorations dans la production de l'acier

Country Status (5)

Country Link
EP (1) EP0268632B1 (fr)
AT (1) ATE169687T1 (fr)
DE (1) DE3752209D1 (fr)
GB (1) GB8613106D0 (fr)
WO (1) WO1987007306A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239029A (en) * 1989-11-28 1991-06-19 Fischer Ag Georg Treating metallic melt with magnesium
WO1994021406A1 (fr) * 1992-03-11 1994-09-29 Ifa Institutet For Produktions & Arbetsplatsutveckling Ab Ameliorations relatives a des cuves de manipulation de metal fondu

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103495710A (zh) * 2013-10-09 2014-01-08 河南省金太阳铸造有限公司 一种浇铸用的孕育剂料斗

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2392127A1 (fr) * 1977-05-26 1978-12-22 Rustavsky Metall Zavod Procede d'injection de reactifs en poudre dans un metal en fusion et dispositif pour le mettre en oeuvre
DE2800684A1 (de) * 1978-01-09 1979-07-12 British Steel Corp Verfahren zur behandlung geschmolzenen metalls in einem behaelter
GB2020404A (en) * 1978-04-25 1979-11-14 Inteco Int Techn Beratung A ladle
EP0062790A1 (fr) * 1981-04-14 1982-10-20 PURMETALL Gesellschaft für Stahlveredlung GmbH & Co Betriebskommanditgesellschaft Récipient pour masses fondues métallurgiques

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2392127A1 (fr) * 1977-05-26 1978-12-22 Rustavsky Metall Zavod Procede d'injection de reactifs en poudre dans un metal en fusion et dispositif pour le mettre en oeuvre
DE2800684A1 (de) * 1978-01-09 1979-07-12 British Steel Corp Verfahren zur behandlung geschmolzenen metalls in einem behaelter
GB2020404A (en) * 1978-04-25 1979-11-14 Inteco Int Techn Beratung A ladle
EP0062790A1 (fr) * 1981-04-14 1982-10-20 PURMETALL Gesellschaft für Stahlveredlung GmbH & Co Betriebskommanditgesellschaft Récipient pour masses fondues métallurgiques

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239029A (en) * 1989-11-28 1991-06-19 Fischer Ag Georg Treating metallic melt with magnesium
GB2239029B (en) * 1989-11-28 1994-06-15 Fischer Ag Georg Magnesium treatment process and apparatus
WO1994021406A1 (fr) * 1992-03-11 1994-09-29 Ifa Institutet For Produktions & Arbetsplatsutveckling Ab Ameliorations relatives a des cuves de manipulation de metal fondu

Also Published As

Publication number Publication date
EP0268632A1 (fr) 1988-06-01
DE3752209D1 (de) 1998-09-17
EP0268632B1 (fr) 1998-08-12
GB8613106D0 (en) 1986-07-02
ATE169687T1 (de) 1998-08-15

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