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WO2001053546A1 - Procede de coulage de ferro-alliage - Google Patents

Procede de coulage de ferro-alliage Download PDF

Info

Publication number
WO2001053546A1
WO2001053546A1 PCT/NO2001/000007 NO0100007W WO0153546A1 WO 2001053546 A1 WO2001053546 A1 WO 2001053546A1 NO 0100007 W NO0100007 W NO 0100007W WO 0153546 A1 WO0153546 A1 WO 0153546A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling bodies
vessel
ferro
filled
ferro alloy
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.)
Ceased
Application number
PCT/NO2001/000007
Other languages
English (en)
Inventor
Tore Valla
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.)
Elkem ASA
Original Assignee
Elkem ASA
Elkem Materials AS
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 Elkem ASA, Elkem Materials AS filed Critical Elkem ASA
Priority to AU2001225595A priority Critical patent/AU2001225595A1/en
Publication of WO2001053546A1 publication Critical patent/WO2001053546A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0405—Rotating moulds

Definitions

  • the present invention relates to a method for casting of ferro alloys.
  • Ferro alloys such as ferrosilicon, ferrochromium and ferromanganese are conventionally cast into blocks using different casting methods, whereafter the blocks are solidified, crushed and sieved to obtain a saleable size.
  • ferro alloys are cast into moulds containing fines of the ferro alloy to be cast.
  • the ferro alloy solidifies as blocks which must be crushed and sieved in the same way as ferro alloys which have been layer cast.
  • ferro alloys are cast on movable casting belts. This gives a correct size in one direction, but also ferro alloy cast on casting belts must be crushed and sieved in order to obtain a saleable size. All the above mentioned casting methods result in relatively high losses of ferro alloys as fines. The amc unt of fines will vary somewhat from ferro alloy to ferro alloy, but will normally be in the range of 3 to 10 % by weight.
  • molten ferro alloy When molten ferro alloy is supplied to the vessel containing the cooling bodies, molten ferro alloy will fill the voids between the cooling bodies and solidify as a plurality of pieces having a size and shape corresponding to the voids between the cooling bodies. By properly selecting the size and the shape of the cooling bodies, the pieces of solidified ferroalloy will have a relatively even size whereby a saleable size of the pieces of ferro alloy is obtained directly without crushing.
  • the cooling bodies are preferably made from cast iron, steel or copper alloy. These materials have a sufficiently high density and a sufficiently high melting point. Further, these materials have a sufficiently high thermal capacity to obtain a fast cooling of the ferro alloy supplied to the vessel in order to cool the ferro alloy very fast to a temperature below the solidification temperature of the ferro alloy.
  • the high cooling rate results in a finer grain structure of the cast ferro alloy than what is obtained by using conventional casting methods.
  • the fine grained structure results in a mechanical stronger material that what is obtained by conventional casting methods.
  • Cast iron, steel and copper alloy also have a rather high thermal expansion coefficient resulting in that the cooling bodies expand when they are heated by the molten ferro alloy whereby the ferro alloy that fills the voids between the cooling bodies will crack.
  • the ferro alloy is, according to the present invention, expanded during solidification. The crushing takes place from the inside of the material. The cast pieces of ferro alloy can thus easily be separated from the cooling bodies and from each other.
  • the content of the vessel is emptied onto a grating or the like in order to separate the pieces of ferro alloy and the cooling bodies.
  • the cooling bodies can be separated from the pieces of cast ferro alloy by magnetic separation, by gravimetric methods or manually.
  • the cooling bodies may have equal size and shape, but cooling bodies having different shapes and/or sizes can also be used. It is preferred to use cooling bodies having such shape and size that they occupy between 30 and 70 % of the volume of the vessel when the vessel is filled with cooling bodies.
  • the cooling bodies are filled into vessel it is formed voids between the cooling bodies.
  • the cooling bodies are preferably filled into the vessel in random way, but the cooling bodies can also be arranged in a regular pattern by means of a robot or the like.
  • the size of the cooling bodies can also be varied in order to obtain a suitable size of the voids formed between the cooling bodies, but it is preferred to use cooling bodies where the largest dimension is between 200 and 300 mm and where the smallest dimension is between 10 mm and 20 mm.
  • Figure 1 is a vertical cut through a vessel for casting ferro alloy.
  • FIG. 1 there is shown a vessel 1 having a bottom 2 and sidewalls 3.
  • the vessel is filled with cooling bodies 4 made from steel which cooling bodies are cube-shaped and have a size of 100 mm x 100 mm x 100 mm.
  • the cooling bodies 4 are filled into the vessel in a random way whereby a plurality of voids are formed between the cooling bodies.
  • the voids will be of different size and shape, but will generally have such dimensions that the largest dimension of the voids are less than 100 mm and larger than 10 mm.
  • molten ferrochromium was tapped from a ladle (not shown).
  • the stream 5 of molten ferro alloy was placed centrally in the vessel 1 and the voids between the cooling bodies 4 were filled with molten ferrochromium 6.
  • the content of the vessel 2 was emptied.
  • the cooling bodies 4 were thereafter separated from the ferrochromium pieces by means of magnetic separation.
  • the pieces of ferrochromium had a size within preferred sales size and further crushing was thus not necessary.
  • the amount of fines produced during casting was very low, about 1.5 % by weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Glass Compositions (AREA)

Abstract

La présente invention concerne un procédé de coulage de ferro-alliages, selon lequel on remplit un récipient d'une pluralité de corps de refroidissement de façon qu'une pluralité de vides se forment entre les corps de refroidissement, corps de refroidissement qui sont fabriqués dans une matière dont le point de fusion est proche de la température de coulage du ferro-alliage à couler ou supérieur à celle-ci et qui possèdent une densité égale ou supérieure à celle du ferro-alliage à couler. On verse le ferro-alliage en fusion dans le récipient contenant les corps de refroidissement et l'on sépare les corps de refroidissement du ferro-alliage solidifié.
PCT/NO2001/000007 2000-01-18 2001-01-10 Procede de coulage de ferro-alliage Ceased WO2001053546A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001225595A AU2001225595A1 (en) 2000-01-18 2001-01-10 Method for casting ferro alloys

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20000236A NO310707B1 (no) 2000-01-18 2000-01-18 Fremgangsmåte for stöping av ferrolegeringer
NO20000236 2000-01-18

Publications (1)

Publication Number Publication Date
WO2001053546A1 true WO2001053546A1 (fr) 2001-07-26

Family

ID=19910610

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2001/000007 Ceased WO2001053546A1 (fr) 2000-01-18 2001-01-10 Procede de coulage de ferro-alliage

Country Status (3)

Country Link
AU (1) AU2001225595A1 (fr)
NO (1) NO310707B1 (fr)
WO (1) WO2001053546A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1323282A (en) * 1971-02-04 1973-07-11 Norton Co Production of fused abrasives
GB1383929A (en) * 1971-04-19 1974-02-12 Treibacher Chemische Werke Ag Process for the production of crystalline abrasive material
GB1557990A (en) * 1976-11-29 1979-12-19 British Steel Corp Temperature control of molten iron or steel
EP0325750A1 (fr) * 1988-01-18 1989-08-02 Heckett Holland B.V. Agent de refroidissement métallique pour un bain métallurgique, procédé de refroidissement utilisant cet agent, son procédé de fabrication
GB2263707A (en) * 1992-01-24 1993-08-04 Steeltech Limited A steel waste treatment system
US5817164A (en) * 1994-03-04 1998-10-06 Aktsionernoe Obschestvo Zakrytogo Tipa "Intermet-Service & Co." Method and apparatus for making feedstock for steel making

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1323282A (en) * 1971-02-04 1973-07-11 Norton Co Production of fused abrasives
GB1383929A (en) * 1971-04-19 1974-02-12 Treibacher Chemische Werke Ag Process for the production of crystalline abrasive material
GB1557990A (en) * 1976-11-29 1979-12-19 British Steel Corp Temperature control of molten iron or steel
EP0325750A1 (fr) * 1988-01-18 1989-08-02 Heckett Holland B.V. Agent de refroidissement métallique pour un bain métallurgique, procédé de refroidissement utilisant cet agent, son procédé de fabrication
GB2263707A (en) * 1992-01-24 1993-08-04 Steeltech Limited A steel waste treatment system
US5817164A (en) * 1994-03-04 1998-10-06 Aktsionernoe Obschestvo Zakrytogo Tipa "Intermet-Service & Co." Method and apparatus for making feedstock for steel making

Also Published As

Publication number Publication date
AU2001225595A1 (en) 2001-07-31
NO310707B1 (no) 2001-08-20
NO20000236D0 (no) 2000-01-18
NO20000236L (no) 2001-07-19

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