EP1068364B1 - Procede pour l'alliage d'aciers et dispositif pour l'execution de ce procede - Google Patents

Procede pour l'alliage d'aciers et dispositif pour l'execution de ce procede Download PDF

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Publication number
EP1068364B1
EP1068364B1 EP99924705A EP99924705A EP1068364B1 EP 1068364 B1 EP1068364 B1 EP 1068364B1 EP 99924705 A EP99924705 A EP 99924705A EP 99924705 A EP99924705 A EP 99924705A EP 1068364 B1 EP1068364 B1 EP 1068364B1
Authority
EP
European Patent Office
Prior art keywords
lance
melt
powder
bath
bar
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
EP99924705A
Other languages
German (de)
English (en)
Other versions
EP1068364A1 (fr
Inventor
Ralf Evertz
Stefan Evertz
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.)
Egon Evertz KG GmbH and Co
Original Assignee
Egon Evertz KG GmbH and Co
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 Egon Evertz KG GmbH and Co filed Critical Egon Evertz KG GmbH and Co
Publication of EP1068364A1 publication Critical patent/EP1068364A1/fr
Application granted granted Critical
Publication of EP1068364B1 publication Critical patent/EP1068364B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material

Definitions

  • the invention relates to a method for alloying steels by introducing metallic aggregates and possibly reducing agents, in powder form in a molten metal, the metallic additives and possibly the reducing agents, directly from a storage bunker via a conveyor line one or more lances immersed in the melt and / or Under bath nozzles, possibly in a mixture with a fluidizing agent, whose share of the quantity to be injected is ⁇ 20%, be introduced into the melt.
  • the invention further relates to an apparatus for performing this method.
  • the present invention belongs to the field of so-called Secondary metallurgy, i.e. aftertreatment of the through the fresh process in the converter or in the electric arc furnace manufactured steel.
  • This aftercare belongs in particular to the alloy setting of the steels, at the desired metal surcharges. Possibly. is in this phase an additional deoxidation, decarburization, Desulfurize trace elements.
  • DE 195 35 014 A1 describes a method for introduction of granular solids in molten metals, in particular Melting steel by means of pneumatic conveying systems, in which the Injector is spaced from the melt and the solids low gas according to the principle of dense phase flow in turbulent Areas of the melt are blown in as in the Tapping beam of a converter used for steel production or electric arc furnace during racking or in the area of impact of a converter's tapping beam or an electric arc furnace in the ladle or during the ladle metallurgical treatment following the Melting process in the area of the sink during the rinsing treatment be inflated onto the bath surface.
  • the pressure to be used for powder delivery is at least 20 bar if a fluidizing agent is used, or that if no fluidizing agent is used, either the pressure to be used for powder conveyance is at least 40 bar or the powders in the powder line are expelled by means of a plunger covering the cross-section of the feed line.
  • the delivery line and / or lance filled powder quantity via a reciprocating piston, that covers the entire cross-section of the delivery line, to drive out.
  • the amount of powder which can be introduced through the piston stroke as well as the Cross section of the delivery line in which the piston is moved limited.
  • the relevant conveyor line or lance section must be refilled after each powder spout.
  • the Powder exit point on the lance is conveniently at Refill sealed by a cover that the Introducing the lance into the melt melts away.
  • fluidizing agents such as small amounts of inert gas, in particular argon or nitrogen, or of liquid hydrocarbons, such as heating or Diesel oil, heavy oil, waste oil, rapeseed oil or paraffin can be used.
  • liquid hydrocarbons such as in particular Waste oil that burns in the melt creates disposal options, which the treatment of waste oil as hazardous waste avoid.
  • Fluidization of the powder is also possible in such a way that pressed alloy surcharges form a core that with a a cup containing a lubricant, e.g. paraffin, wax, Oil or the like, is covered.
  • a lubricant e.g. paraffin, wax, Oil or the like.
  • Concerning core and Existing particles can shell without the addition of additional fluidizing agents (dry) or with other small proportions of gaseous or liquid fluidizing agents which however, should not exceed the amount mentioned in claim 1, be used.
  • the lance is preferably designed as an annular nozzle and in a further embodiment as a double-walled ring nozzle, wherein through one of the double-walled outlets inert gases are blown into the melt, thereby cooling the lance and / or a melt stirring movement is generated.
  • An optimization this stirring movement is achievable when the lance outflow openings are designed such that the inert gases are tangential emanate.
  • Dosage of the additives to different bath movements generate, which should be more intense, the larger the pro Unit of time introduced is the amount of metal or deoxidation introduced. Unlike in the methods known from the prior art can thus the dosage amount per unit of time and Bath movement can be regulated independently.
  • a pressure between 50 bar and 100 bar, under which the powdery aggregates are injected are applied.
  • the above-described method according to the invention offers several Possibilities of alloy components such as aluminum, silicon, Magnesium, calcium, various carbides, to be added to the melt:
  • the volumetric delivery of Gas / powder mixture or the gas / liquid mixture, the Gas or liquid content at most 20% of the mixture is.
  • the fourth option is the one described above volumetric transport of the mixture with a "dry Kern "from the supplements to be introduced and a moist one Shell or a paste powder mixture, preferably consists of hydrocarbons that are suitable for lubricants.
  • the proportion of fluidizing agents (inert gas, liquid) is reduced to a minimum.
  • the dosage takes place via a Volume measurement that is more accurate than the conventional gravimetric Method or flow measurement is.
  • the discharge pressure can be adjusted accordingly the flowability of the powdery solids can be varied.
  • alloys can be made during the Treatments can be set according to specifications.
  • the ones to be made Dosages can be dust-free and low in emissions carry out. Because no large amount of transport gas (like after the state of the art) or only a low fluidization is present in the feed product, the surcharges the dwell time of the aggregates in the reaction area the lance mouth in the melt.
  • the delivery line an air or liquid inlet, preferably with an adjustable dosing device depending on the Reservoir transported quantities, with which the desired Mixing ratios powder: (fluidizing agent or Have the lubricant adjusted.
  • the lance has a double jacket with two outflow openings, of which through the one the powdered metal or Reducing agent, which is possibly fluidized, and by other inert gases flow.
  • the outflow opening or outflow openings the lance is ideally arranged tangentially opening.
  • the lance itself is preferably pivotable.
  • the bathroom (the Melt) can be in a converter, a pan or a torpedo car be arranged.
  • the device shown in Fig. 1 consists essentially from a metallurgical vessel 10 with a melt bath 11, in the one lance 12 is immersed, the lance outlet opening 13 lies below the bath surface 14. That lance that is annular, with a feed line 15 connected, in the via a pump 16 from a reservoir 17 powdered metal or metal mixture removed, which may contain reducing agents. Possibly. several dosing devices are provided, which Have the desired mixing ratio optimally set.
  • Fig. 2 also shows a schematic view of an inlet point for inert gases or liquids which are directed towards the Arrow 21 are fed via a ring line 22.
  • the fluidizing agents supplied in this way mix with the Powder stream which is in the direction of arrow 23 under pressure of For example, 40 to 50 bar is promoted, resulting in a Solid / gas or solid / liquid mixture forms that in Direction of arrow 24 is guided to lance 12.
  • the lance has outlet openings 25 below the bath level which leak almost or ideally in a tangential manner and a vortex movement in the direction of arrows 26 of the outflowing Allow powder or powder mixture (see FIG. 3).
  • a 4 is a longitudinal view of a double-walled lance refer to.
  • the lance which as well as the state of the Known technology, is covered with a fireclay lining 27, has an annular channel 28 through which the metallic aggregates in powder form, with or without fluidizing agent, in the direction the arrows 29 are expelled.
  • Pumps and dosing devices of the type used are basic known from the prior art, for example from the cement industry, in the mixed paste-like cement is promoted under high pressure.
  • the metallurgical vessel 10 can be a pan, a torpedo car or be a converter.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Coating With Molten Metal (AREA)
  • Continuous Casting (AREA)

Claims (10)

  1. Procédé pour l'alliage d'aciers en introduisant des additifs métalliques et, le cas échéant, des agents de réduction, en forme de poudre dans un bain liquide de fusion, les additifs métalliques et, le cas échéant, les agents de réduction étant introduits à partir d'un réservoir d'alimentation via une conduite de transport directement par une ou plusieurs lances (12) plongeant dans la masse fondue et/ou tuyères sous-bain, le cas échéant dans un mélange avec un agent de fluidification dont la part à la quantité à insuffler est ≤ 20 %, dans la masse fondue,
    caractérisé par le fait que la pression à appliquer pour le transport des poudres est de 20 bars au moins lorsqu'on utilise un agent de fluidification, ou que, lorsqu'on n'utilise pas d'agent de fluidification, soit la pression à appliquer pour le transport des poudres est de 40 bars au moins soit les poudres se trouvant dans la conduite à poudres sont expulsées au moyen d'un piston plongeur recouvrant la section de la conduite de transport.
  2. Procédé selon la revendication 1, caractérisé par le fait que les poudres sont fluidifiées ou deviennent pâteuses par l'addition de faibles quantités de gaz inerte tel que l'argon ou l'azote, ou d'un hydrocarbure liquide tel que le fuel/diesel, l'huile lourde, l'huile usée, l'huile de colza ou la paraffine, les poudres étant insufflées en forme comprimée comme noyau avec une enveloppe contenant un lubrifiant, et/ou que les poudres présentent une grosseur maximale de grain de ≤ 1 mm, de préférence de ≤ 0,1 mm.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé par le fait que les poudres sont insufflées via une lance orientable (12) qui, de préférence, est réalisée comme tuyère annulaire.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que la lance est réalisée à double paroi et que des gaz inertes sont insufflés dans la masse fondue à travers une des ouvertures d'échappement définies par la double paroi, ce par quoi la lance est refroidie et/ou un mouvement agitateur de la masse fondue est généré, en particulier par le fait que les gaz inertes s'échappent tangentiellement de la lance.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé par une pression comprise entre 50 bars et 100 bars.
  6. Dispositif pour la mise en oeuvre du procédé selon les revendications 1 à 5, caractérisé par le fait qu'une conduite de transport (15) présentant une pompe haute pression (16) conduit directement d'un réservoir (17) vers une lance (12) ou une tuyère sous-bain.
  7. Dispositif selon la revendication 6, caractérisé par le fait qu'une entrée d'air ou de liquide (20), de préférence avec un dispositif de dosage réglable en fonction des quantités extraites du réservoir (17), mène dans la conduite de transport (15).
  8. Dispositif selon l'une des revendications 6 ou 7, caractérisé par le fait que la lance (12) présente une double chemise avec deux ouvertures d'échappement à travers l'une desquelles s'écoule le métal ou l'agent de réduction en forme de poudre, qui, le cas échéant, est fluidifié, et à travers l'autre desquelles s'écoulent des gaz inertes.
  9. Dispositif selon l'une des revendications 6 à 8, caractérisé par le fait que l'ouverture ou bien les ouvertures d'échappement sort(ent) de façon tangentielle de la lance (12) qui, de préférence, est orientable dans le bain.
  10. Dispositif selon l'une des revendications 6 à 9, caractérisé par le fait que le bain est disposé dans une poche, dans un wagon torpille ou dans un convertisseur.
EP99924705A 1998-04-02 1999-03-27 Procede pour l'alliage d'aciers et dispositif pour l'execution de ce procede Expired - Lifetime EP1068364B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19814748A DE19814748A1 (de) 1998-04-02 1998-04-02 Verfahren zum Legieren von Stählen und Vorrichtung zur Durchführung des Verfahrens
DE19814748 1998-04-02
PCT/DE1999/000932 WO1999051785A1 (fr) 1998-04-02 1999-03-27 Procede pour l'alliage d'aciers et dispositif pour l'execution de ce procede

Publications (2)

Publication Number Publication Date
EP1068364A1 EP1068364A1 (fr) 2001-01-17
EP1068364B1 true EP1068364B1 (fr) 2001-11-21

Family

ID=7863331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99924705A Expired - Lifetime EP1068364B1 (fr) 1998-04-02 1999-03-27 Procede pour l'alliage d'aciers et dispositif pour l'execution de ce procede

Country Status (6)

Country Link
US (1) US6383253B1 (fr)
EP (1) EP1068364B1 (fr)
AT (1) ATE209260T1 (fr)
DE (2) DE19814748A1 (fr)
ES (1) ES2168015T3 (fr)
WO (1) WO1999051785A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7736415B2 (en) * 2007-09-05 2010-06-15 Specialty Minerals (Michigan) Inc. Rotary lance
WO2016172790A1 (fr) * 2015-04-26 2016-11-03 Hatch Ltd. Procédé et appareil de production d'aciers à teneur élevée en manganèse

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE227452C (fr)
US2577764A (en) 1949-11-04 1951-12-11 Air Reduction Desulfurization of ferrous metals
US3011829A (en) * 1959-03-23 1961-12-05 Diamond Alkali Co Apparatus for discharging particulate material
LU65423A1 (fr) * 1972-05-25 1973-12-04
SE441212C (sv) * 1977-12-23 1986-11-04 Asea Ab Anordning for injicering av pulver i en metallsmelta
DE3418455A1 (de) * 1983-07-19 1985-01-31 Dr. Küttner GmbH & Co KG, 4300 Essen Verfahren und einrichtung zum einblasen feinkoerniger feststoffe in eine metallschmelze
US4652306A (en) * 1984-10-12 1987-03-24 Nippon Kokan Kabushiki Kaisha Method of refining molten steel by arc process
DD227452A1 (de) * 1984-10-25 1985-09-18 Maxhuette Unterwellenborn Verfahren zur zufuehrung staubfoermiger materialien in metallbaeder
JPS62192520A (ja) * 1986-02-19 1987-08-24 Sumitomo Metal Ind Ltd 低炭素鋼の製造方法
AT402939B (de) * 1992-07-16 1997-09-25 Voest Alpine Ind Anlagen Verfahren und anlage zum herstellen einer metallschmelze
DE4237177C2 (de) * 1992-07-23 1995-10-12 Bernd Feldhaus Regelbare mechanische Dosierförderanlage für staubförmige Güter
DE4400029C2 (de) * 1994-01-03 1997-04-10 Neuhof Berthold Vorrichtung für eine regelbare dosierte Förderung von staub- und granulatförmigen Schüttgütern, bei konstantem Druck
DE19535014C2 (de) * 1995-09-21 1999-03-04 Stein Ind Anlagen Inh Christel Verfahren zum Einbringen von körnigen Feststoffen in Metallschmelzen

Also Published As

Publication number Publication date
US6383253B1 (en) 2002-05-07
ES2168015T3 (es) 2002-05-16
DE19814748A1 (de) 1999-10-07
EP1068364A1 (fr) 2001-01-17
ATE209260T1 (de) 2001-12-15
DE59900687D1 (de) 2002-02-21
WO1999051785A1 (fr) 1999-10-14

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