EP0834577A1 - Procédé et dispositif pour le traitement de metal fondu et une fonte ou un acier produit par ce procédé - Google Patents

Procédé et dispositif pour le traitement de metal fondu et une fonte ou un acier produit par ce procédé Download PDF

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Publication number
EP0834577A1
EP0834577A1 EP96810642A EP96810642A EP0834577A1 EP 0834577 A1 EP0834577 A1 EP 0834577A1 EP 96810642 A EP96810642 A EP 96810642A EP 96810642 A EP96810642 A EP 96810642A EP 0834577 A1 EP0834577 A1 EP 0834577A1
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EP
European Patent Office
Prior art keywords
melt
oxide
partially
particulate
oxidic
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.)
Withdrawn
Application number
EP96810642A
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German (de)
English (en)
Inventor
Peter H. Grelling
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
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP96810642A priority Critical patent/EP0834577A1/fr
Publication of EP0834577A1 publication Critical patent/EP0834577A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • C21C1/105—Nodularising additive agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C22C33/10—Making cast-iron alloys including procedures for adding magnesium
    • C22C33/12—Making cast-iron alloys including procedures for adding magnesium by fluidised injection

Definitions

  • the invention relates to a method for the treatment of alloys or unalloyed iron melting by adding at least a substance to change the morphology of the in carbon or graphite present in the melt.
  • the method according to the invention is based on that of the invention leading realization that very fine-particle oxidic Substances, especially basic metal oxides, e.g. with particle sizes in the range of about 1 - 10 ⁇ m, in a molten metal stay dispersed once in the Melt are distributed, preferably preferably essentially evenly.
  • the invention further relates to applications of the invention Method with the features of claims 7 and 8.
  • the invention also relates to a device for carrying it out of the inventive method with the features of claim 9.
  • the invention also relates to cast iron and cast steel, the or the according to the inventive method is preserved.
  • Such a distribution can be simple and according to the invention effective with the help of e.g. for oxygen freshening known hollow lance take place to carry out the
  • the inventive method introduced into the melt is and a stream of a gaseous and preferably inert carrier medium, e.g. Carbon dioxide or nitrogen, with aerosol-like or smoke-like suspended therein, blows finely divided metal oxide into the melt.
  • a gaseous and preferably inert carrier medium e.g. Carbon dioxide or nitrogen
  • aerosol-like or smoke-like suspended therein blows finely divided metal oxide into the melt.
  • the mouth of the hollow lance can be conveniently approximately in the middle of the Melting crucible, the pan or the converter can be arranged and up to the bottom in the containing the melt Immerse the container.
  • the given conditions for each optimal position of the lance mouth can be determined if necessary simple professional tests can be determined.
  • the blowing in of the stream of gaseous carrier and in it suspended fine-particle metal oxide using a lance is only a preferred one and not a critical one Measure for carrying out the inventive Procedure; the stream of carrier gas and oxide can also from be introduced into the molten iron below or laterally.
  • gaseous carriers such as carbon monoxide, water vapor, Oxygen and noble gases (He, Ne, Ar) come in Question if the resulting costs or any Reactions with the melt or its components are acceptable are.
  • Particulate material consisting at least partially of oxidic components comprises metal oxides, preferably basic metal oxides, such as magnesium oxide, individually or in a mixture, and also non-metallic oxide precursors, such as carbonates, which convert to oxides under the conditions of the melt and which are also sufficiently finely divided
  • the oxidic material preferably consists at least predominantly, ie at least approximately 50% by weight, of metal oxide, in particular basic metal oxide
  • alkali metal such as Li, Na, K, Rb, Cs
  • alkaline earth metal such as Be, Mg, Ca, Sr, Ba
  • rare earth metals lanthanum and lanthanides with the atomic numbers
  • the additive used should be at least partially in oxidic form under the conditions of a molten iron environment or be convertible into it, without splitting off elemental hydrogen or nitrogen or forming it hydrolytically.
  • the oxidic additive used is essentially free of moisture, preferably the oxidic material or its precursor is essentially free of components which, under the conditions of the melt, have adverse physical (eg steam development) and / or chemical effects (nitrogenation) exercise.
  • finely divided is generally understood to mean an additional material which consists at least partially and preferably predominantly (ie at least 50% by weight) of particles with a size of less than 10 ⁇ m.
  • the oxidic additive is at least partially consists of particles with sizes in the range of 1 ⁇ m. Magnesium oxide with such particle sizes is available in technical quantities. Particles with sizes over 10 ⁇ m can also be used, but such particles tend to float when the melt is static solidified.
  • the optimum particle size according to the invention of the oxidic filler is generally one that results in the particles floating in the molten iron without significant floating.
  • melt is expediently carried out after the melting phase in the melting furnace or instead of the usual one Mg treatment in a treatment or watering vessel.
  • the Sulfur content of an iron melt to be treated according to the invention preferably as deep as possible and preferably below about 0.30% by weight, in particular below 0.1% by weight.
  • the composition of an iron smelter Carrying out the method according to the invention with regard to composition and trace elements meet the requirements of Melting corresponds to the state of the art the Mg treatment used to form nodular graphite will.
  • the carbon content of the melt can range the proportions customary for the respective iron products and controlled in the usual way.
  • the stream is gaseous Carrier and finely divided oxides suspended in it for so long is blown into the melt, based on about 0.5% on the weight of the melt, entered on metal oxide are. This can typically occur within a period of 1 - 3 minutes and preferably happens as quickly as possible. Higher proportions of up to 5% metal oxide are possible but bring in the production of cast iron with nodular graphite typically no particular advantages.
  • the finely divided oxidic additional material is expedient essentially evenly distributed in the melt. This can be done by entering the gas flow achieved and if necessary by spilling the Melt to be completed. In the solidified melt can the oxide particles both in and between the graphite precipitates be included.
  • the temperature of the molten iron is when the inventive method at least so far above the Melting temperature that by blowing in the desired one preheated stream of gaseous carrier and finely divided Metal oxide no cooling of the melt under the Freezing point occurs.
  • Typical treatment temperatures are in the range for treatment with metallic Magnesiun usual temperatures, typically in the range of 1400 - 1550 ° C.
  • the method according to the invention makes it possible to replace the so far to influence graphite formation in molten iron used, optionally alloyed metallic Magnesium finely divided metal oxide, especially magnesium oxide or mixtures of MgO, CaO, rare earth metal oxides etc., and thus the disadvantages or problems metallic additives to influence the carbon morphology to avoid.
  • a preferred application of the method of the invention is that for the production of cast iron with graphite embedded in spherical, nodular or vermicular form.
  • a device to carry out the method according to the invention in Shape of a crucible or a cast pan with an in this insertable hollow lance with a source for a stream of gaseous carrier with suspended therein Particles from the basic metal oxide is connected.
  • a such a stream can be conveniently located in a high swirl zone Turbulence is generated in which the finely divided metal oxide and the gaseous carrier is fed in and, if appropriate be preheated.
  • the lance opening is designed so that as possible many small gas bubbles are created when blowing in.
  • one according to the invention is also according to the invention Process received cast steel or received Cast iron.
  • FIG. 1 shows more in detail an example of a suitable for carrying out the invention Investment.
  • This Lance 18 is in a (not shown) tiltable container 10, immersed in the molten iron 15. Through the lance 18, the mixture of carrier gas and finely divided oxide is blown into the molten iron 15.
  • liquid iron container 10 After completion of the treatment process according to the invention the liquid iron container 10 can be tilted and the treated one Molten metal after slagging and if necessary Shed vaccine with usual vaccine in the usual way will.
  • FIG. 2A shows a schematic illustration of a liquid metal container in the working position for performing the inventive Process by blowing a stream of gaseous carrier and fine particulate suspended in it Metal oxide 28 through the bottom of a container 20 into the molten iron 25.
  • Fig. 2B shows the position of the container 20 for Filling and emptying the container 20 with molten iron 25th
  • Example 2 The procedure was as in Example 1, but with the modification, that the injected stream of nitrogen is not a metal oxide contained. Examination of the castings received showed lamellar graphite inclusions, i.e. the Graphite formation from gray cast iron.
  • Modifications of the invention include the introduction of finely divided oxidic material, as explained above, in the Melt in combination with the introduction of metallic and e.g. more desired as alloy components or modifiers Components in finely divided form, and / or in combination with the implementation of known fresh or refining processes by introducing one with the melt or their components of reactive gas.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP96810642A 1996-09-30 1996-09-30 Procédé et dispositif pour le traitement de metal fondu et une fonte ou un acier produit par ce procédé Withdrawn EP0834577A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96810642A EP0834577A1 (fr) 1996-09-30 1996-09-30 Procédé et dispositif pour le traitement de metal fondu et une fonte ou un acier produit par ce procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96810642A EP0834577A1 (fr) 1996-09-30 1996-09-30 Procédé et dispositif pour le traitement de metal fondu et une fonte ou un acier produit par ce procédé

Publications (1)

Publication Number Publication Date
EP0834577A1 true EP0834577A1 (fr) 1998-04-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810642A Withdrawn EP0834577A1 (fr) 1996-09-30 1996-09-30 Procédé et dispositif pour le traitement de metal fondu et une fonte ou un acier produit par ce procédé

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EP (1) EP0834577A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2911657A1 (de) * 1978-03-24 1979-10-11 Toyo Soda Mfg Co Ltd Zusatz zum raffinieren von metallen und verfahren zu seiner herstellung
WO1987004468A1 (fr) * 1986-01-27 1987-07-30 The Dow Chemical Company Composite d'oxyde de calcium-magnesium
WO1995024508A1 (fr) * 1994-03-09 1995-09-14 Elkem A/S Agent d'inoculation pour la fabrication de fonte et son procede d'obtention

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2911657A1 (de) * 1978-03-24 1979-10-11 Toyo Soda Mfg Co Ltd Zusatz zum raffinieren von metallen und verfahren zu seiner herstellung
WO1987004468A1 (fr) * 1986-01-27 1987-07-30 The Dow Chemical Company Composite d'oxyde de calcium-magnesium
WO1995024508A1 (fr) * 1994-03-09 1995-09-14 Elkem A/S Agent d'inoculation pour la fabrication de fonte et son procede d'obtention

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