EP0448244B1 - Schieberfüllmasse für metallurgische Gefässe - Google Patents

Schieberfüllmasse für metallurgische Gefässe Download PDF

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Publication number
EP0448244B1
EP0448244B1 EP91301771A EP91301771A EP0448244B1 EP 0448244 B1 EP0448244 B1 EP 0448244B1 EP 91301771 A EP91301771 A EP 91301771A EP 91301771 A EP91301771 A EP 91301771A EP 0448244 B1 EP0448244 B1 EP 0448244B1
Authority
EP
European Patent Office
Prior art keywords
skulling
particulate
material according
granules
skulling material
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 - Lifetime
Application number
EP91301771A
Other languages
English (en)
French (fr)
Other versions
EP0448244A3 (en
EP0448244A2 (de
Inventor
Vincent Edward Mellows
Klaus Friede
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.)
Foseco International Ltd
Original Assignee
Foseco International Ltd
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 Foseco International Ltd filed Critical Foseco International Ltd
Publication of EP0448244A2 publication Critical patent/EP0448244A2/de
Publication of EP0448244A3 publication Critical patent/EP0448244A3/en
Application granted granted Critical
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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
    • B22D41/44—Consumable closure means, i.e. closure means being used only once
    • B22D41/46—Refractory plugging masses
    • 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

Definitions

  • This invention relates to the inhibition of skull in the outlet nozzles of metallurgical handling vessels.
  • the invention is of particular importance in respect of metallurgical handling vessels such as furnaces, for example, ladle furnaces, ladles, tundishes and the like which have nozzles comprising opening and closing means which may be used to control the rate of flow of molten metal, e.g. steel, from the vessel.
  • metallurgical handling vessels such as furnaces, for example, ladle furnaces, ladles, tundishes and the like which have nozzles comprising opening and closing means which may be used to control the rate of flow of molten metal, e.g. steel, from the vessel.
  • nozzles comprising opening and closing means which may be used to control the rate of flow of molten metal, e.g. steel, from the vessel.
  • nozzles comprising opening and closing means which may be used to control the rate of flow of molten metal, e.g. steel, from the vessel.
  • sliding gate and slide-gates are increasing in prominence throughout the metallurgical industry.
  • Molten steel in, e.g. a ladle, having a closed sliding-gate outlet nozzle tends to cool and solidify in the nozzle bores to form what is known as "skull" and this may partly or completely block the outlet when the outlet is opened.
  • skull particulate high melting point matter
  • 'anti-skulling material' particulate high melting point matter
  • Such anti-skulling material is known and typically comprises one or more particulate filler materials and may optionally include a sintering agent and/or carbon. In use of the material in a nozzle outlet, sintering of the material occurs at the material/molten metal interface.
  • the sintering effect progresses away from the area of contact to form, e.g. a crust or bridge of sintered material and beneath this crust the remainder of the material is unsintered.
  • the loose material beneath the sintered crust flows out and the crust is dislodged owing to the metallostatic pressure and thus free-opening of the nozzle is effected.
  • known particulate anti-skulling materials can suffer the drawback of segregation owing to the different particle size and density of each constituent of the mixture. Segregation occurs in transit of the material and results in the anti-skulling material giving inconsistent and unreliable results.
  • One problem relates to the formation of a crust which is uneven in thickness. This defect can promote areas of crust which are too thick to be dislodged by the metallostatic pressure with the result that complete free-opening of the nozzle is prevented which is clearly most undesirable.
  • EP-A-0137734 is disclosed a flux for use particularly in the continuous casting of steel.
  • the flux is formed as granules of a composition containing carbonaceous powder, binder and metallic oxides, the latter being in combined form, e.g. calcium oxide and silicon dioxide as calcium silicate in synthetic wollastonite.
  • An essential feature of the granules is that they have a higher proportion of carbonaceous powder in their surfaces than the overall proportion of carbonaceous powder in the granules, i.e. there is a non-homogeneous distribution of the constituents throughout the granules.
  • an anti-skulling material in granular form comprising a particulate core principally composed of quartz and having a coating layer of a multiplicity of fine particles.
  • the fine particles of the coating layer are principally made of materials selected from the feldspar per group and the coating material has a lower melting point than the core material.
  • an anti-skulling material for use in the outlet bore of a metallurgical handling vessel, which material contains up to 10% binder and/or sintering aid and particulates comprising 0 to 10% carbon or carbonaceous material, the anti-skulling material being in granular form and the balance of the composition of the granules being sinterable or partially sinterable refractory filler material and wherein the particulate constituents of the granules are distributed substantially homogeneously therein.
  • the granulated anti-skulling material of this invention is a material which, in use, will provide a physical barrier to molten metal entering the bore of a metallurgical handling vessel nozzle when the nozzle is closed and yet permit free-opening of the nozzle when the nozzle is opened and provides these properties in a more reliable and consistent manner than the prior art materials.
  • the granules comprising the granulated mixture may be produced by any of the known granulation processes but preferably the granules are formed by means of a spray-drying granulation process.
  • a suspension agent such as a heteropolysacharide (Biopolymer) or a carboxy-methyl-cellulose.
  • Each granule of an anti-skulling material has the particulate constituents thereof distributed substantially homogeneously and thereby compensates for any differences in the particle size and/or density of its constituents. Accordingly, the material possesses enhanced resistance to segregation which, in turn, leads to significantly more uniform and reliable opening of the slide-gate mechanism of a metallurgical handling vessel.
  • the granulated anti-skulling material composition of the invention may comprise a mixture of two or more particulate refractory materials which partially sinter, i.e. form a bridge or crust, when subjected to elevated temperatures, e.g. in excess of 1500°C.
  • the composition may comprise two or more of the following refractory materials: chromite flour, silica flour, olivine, calcined magnesite, bauxite, chamotte, zircon and refractory aluminosilicates mixed in proportions appropriate to ensure that partial sintering occurs.
  • the anti-skulling composition may comprise one or more particulate refractory materials such as alumina or magnesia which do not readily sinter at molten metal handling temperatures but which may be caused to partially sinter at said temperatures by mixing with such particulate refractory material a relatively minor proportion of a known sintering aid such as alkali or alkaline earth metal silicates, phosphates or borates.
  • a known sintering aid such as alkali or alkaline earth metal silicates, phosphates or borates.
  • an alkali metal silicate or phosphate may be present in the granulated anti-skulling material of the invention as a result of its presence as a binder in the composition as formulated prior to granulation of the composition.
  • binders include sodium polyphosphates, sodium metaphosphates, aluminium phosphate and sodium silicate.
  • binder is present in an amount up to 10% by weight, e.g. from 1 to 10%, especially 2 to 5% by weight.
  • the composition may comprise a proportion of particulate carbon or carbonaceous material, such as carbon black or crushed graphite electrode scrap, the inclusion of which, it is believed, is useful in controlling the degree to which sintering occurs in the material remote from the composition/molten metal interface.
  • particulate carbon or carbonaceous material such as carbon black or crushed graphite electrode scrap
  • the anti-skulling material of the invention has a typical consumption rate of from about 2 kg to about 40 kg/vessel.
  • the dry particulate materials were mixed in a blender/mixer and then sufficient water was added to form a slurry having about 60% solids content.
  • the slurry was sprayed through a fine nozzle into a hot-air spray drying vessel operating on the counter-flow principle.
  • the temperature of the air was between 300 to 600°C.
  • the resulting free-flowing granules were discharged into suitable containers for transit.
  • composition was prepared substantially in accordance with Example 1 except that the water added was consistent with that required for use with a high-energy mixer of the type manufactured by the Eirich Company.
  • an anti-skulling material composition according to Example 1 In use of an anti-skulling material composition according to Example 1, 30 kg of free-flowing granules were charged into the bore of a slide-gate nozzle of a 200 tonne ladle. On introduction of molten metal steel at 1600°C into the ladle the initial contact with the anti-skulling material promoted partial sintering of the outer surface of the granules thus preventing molten steel or associated skull from entering into the bore. Upon opening of the slide-gate mechanism, all the anti-skulling material was instantly discharged from the bore enabling free-running of the slide gate to be established immediately on initial opening. The formation of any skull in the nozzles zone requiring removal before the steel could egress from the ladle was prevented.

Claims (7)

  1. Antirückstandsmaterial zur Verwendung in der Auslaßbohrung eines metallurgischen Gebrauchsgefäßes, wobei das Material bis zu 10% Bindemittel und/oder Sinterhilfsmittel sowie Feststoffteilchen enthält, die 0 bis 10% Kohlenstoff oder kohlenstoffhaltiges Material aufweisen, wobei das Antirückstandsmaterial in Granulatform vorliegt und der Rest der Zusammensetzung der Granulate ein sinterbares oder teilweise sinterbares feuerfestes Füllstoffmaterial ist sowie die teilchenförmigen Bestandteile der Granulate im wesentlichen darin homogen verteilt sind.
  2. Antirückstandsmaterial nach Anspruch 1, dadurch gekennzeichnet, daß das Bindemittel aus der Gruppe ausgewählt ist, die aus Natriumpolyphoshaten, Natriummetaphosphaten, Aluminiumphosphat und Natriumsilicat besteht.
  3. Antirückstandsmaterial nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Bindemittel in einer Menge von 2 bis 5 Gew% vorliegt.
  4. Antirückstandsmaterial nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Granulate zwei oder mehr der Materialien Chromitmehl, Quarzmehl, Olivin, calcinierter Magnesit, Bauxit, Schamotte, Zirkon und feuerfeste Aluminosilicate in Teilchenform enthalten.
  5. Antirückstandsmaterial nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Granulate ein oder mehrere teilchenförmige feuerfeste Materialien enthalten, die zusammen mit einer kleineren Menge eines Sinterhilfsmittels bei der Handhabungstemperatur von geschmolzenem Material nicht leicht sintern.
  6. Antirückstandsmaterial nach Anspruch 5, dadurch gekennzeichnet, daß das teilchenförmige feuerfeste Material Aluminiumoxid oder Magnesiumoxid ist.
  7. Antirückstandsmaterial nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß das Sinterhilfsmittel ein Alkali- oder Erdalkalimetallsilicat, -phosphat oder -borat ist.
EP91301771A 1990-03-17 1991-03-04 Schieberfüllmasse für metallurgische Gefässe Expired - Lifetime EP0448244B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9006098 1990-03-17
GB909006098A GB9006098D0 (en) 1990-03-17 1990-03-17 Metallurgical handling vessels

Publications (3)

Publication Number Publication Date
EP0448244A2 EP0448244A2 (de) 1991-09-25
EP0448244A3 EP0448244A3 (en) 1992-11-04
EP0448244B1 true EP0448244B1 (de) 1997-07-16

Family

ID=10672835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91301771A Expired - Lifetime EP0448244B1 (de) 1990-03-17 1991-03-04 Schieberfüllmasse für metallurgische Gefässe

Country Status (6)

Country Link
EP (1) EP0448244B1 (de)
KR (1) KR910016414A (de)
AT (1) ATE155378T1 (de)
DE (1) DE69126808T2 (de)
ES (1) ES2104659T3 (de)
GB (1) GB9006098D0 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0616825A2 (pt) 2005-08-17 2011-07-05 Akzo Nobel Coatings Int Bv composição de revestimento compreendendo um poliacrilato poliol, um poliéster poliol, e um reticulador isocianato funcional

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113501A (en) * 1977-07-28 1978-09-12 Yoshito Edamoto Temporary sealant of a nozzle opening of sliding nozzle
US4332910A (en) * 1981-03-02 1982-06-01 Ferro Corporation Free flowing metallurgical well powder
DE3214168C1 (de) * 1982-04-17 1984-01-05 Dislich, Heinz, 4100 Duisburg Schieberfuellmasse fuer Giesspfannen
GB2122180A (en) * 1982-06-18 1984-01-11 China Steel Corp Packing sand for steel ladles
JPS6036386A (ja) * 1983-08-05 1985-02-25 東芝セラミツクス株式会社 スラデイングノズル用充填材
GB8325438D0 (en) * 1983-09-22 1983-10-26 Foseco Int Fluxes for casting metals

Also Published As

Publication number Publication date
EP0448244A3 (en) 1992-11-04
KR910016414A (ko) 1991-11-05
ES2104659T3 (es) 1997-10-16
DE69126808T2 (de) 1998-02-19
DE69126808D1 (de) 1997-08-21
EP0448244A2 (de) 1991-09-25
ATE155378T1 (de) 1997-08-15
GB9006098D0 (en) 1990-05-16

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