EP1068364B1 - Verfahren zum legieren von stählen und vorrichtung zur durchführung des verfahrens - Google Patents
Verfahren zum legieren von stählen und vorrichtung zur durchführung des verfahrens Download PDFInfo
- 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
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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)
Description
daß der zur Pulverförderung aufzuwendende Druck mindestens 20 bar beträgt, wenn ein Fluidisierungsmittel verwendet wird, oder
daß dann, wenn kein Fluidisierungsmittel verwendet wird, entweder der zur Pulverförderung aufzuwendende Druck mindestens 40 bar beträgt oder die in der Pulverleitung befindlichen Pulver mittels eines den Förderleitungsquerschnitt überdeckenden Preßkolbens ausgetrieben werden.
- Fig 1
- eine schematische Ansicht einer erfindungsgemäßen Vorrichtung,
- Fig. 2
- eine schematische vergrößerte Darstellung einer Einlaßstelle in die Förderleitung für die Fluid-Beimischung,
- Fig. 3
- eine Querschnittsansicht einer Lanze mit tangentialen Ausströmöffnungen und
- Fig. 4
- eine Längsquerschnittsansicht einer Lanze mit zwei Ausströmkanälen.
Claims (10)
- Verfahren zum Legieren von Stählen durch Einbringen von metallischen Zuschlägen und ggf. Reduktionsmitteln, in pulvriger Form in eine flüssige Metallschmelze, wobei die metallischen Zuschläge und ggf. die Reduktionsmittel, aus einem Vorratsbunker über eine Förderleitung direkt über ein oder mehrere in die Schmelze eintauchenden Lanzen (12) und/oder Unterbaddüsen, ggf. in einer Mischung mit einem Fluidisierungsmittel, dessen Anteil an der einzublasenden Menge ≤ 20 % ist, in die Schmelze eingeführt werden,
dadurch gekennzeichnet, daß der zur Pulverförderung aufzuwendende Druck mindestens 20 bar beträgt, wenn ein Fluidisierungsmittel verwendet wird, oder
daß dann, wenn kein Fluidisierungsmittel verwendet wird, entweder der zur Pulverförderung aufzuwendende Druck mindestens 40 bar beträgt oder die in der Pulverleitung befindlichen Pulver mittels eines den Förderleitungsquerschnitt überdeckenden Preßkolbens ausgetrieben werden. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Pulver durch Zugabe von geringen Mengen an Inertgas, wie Argon oder Stickstoff, oder einem flüssigen Kohlenwasserstoff, wie Heizöl/Diesel, Schweröl, Altöl, Rapsöl oder Paraffin, fluidisiert oder pasteus werden, wobei die Pulver in gepreßter Form als Kern mit einer ein Gleitmittel enthaltenen Schale eingeblasen werden und/oder daß die Pulver eine maximale Korngröße von ≤ 1 mm, vorzugsweise ≤ 0,1 mm, aufweisen.
- Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Pulver über eine schwenkbare Lanze (12), die vorzugsweise als Ringdüse ausgebildet ist, eingeblasen werden.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Lanze doppelwandig ausgebildet ist und daß durch eine der doppelwandig bedingten Ausströmöffnungen Inertgase in die Schmelze eingeblasen werden, wodurch die Lanze gekühlt und/oder eine Schmelze-Rührbewegung erzeugt wird, insbesondere durch tangentiales Ausströmen der Inertgase aus der Lanze.
- Verfahren nach einem der Ansprüche 1 bis 4, gekennzeichnet, durch einen Druck zwischen 50 bar und 100 bar.
- Vorrichtung zur Durchführung des Verfahrens nach Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß von einem Vorratsbehälter (17) eine eine Hochdruckpumpe (16) aufweisende Förderleitung (15) direkt zu einer Lanze (12) oder Unterbaddüse führt.
- Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß in die Förderleitung (15) ein Luft- oder Flüssigkeitseinlaß (20), vorzugsweise mit einer regelbaren Dosiereinrichtung in Abhängigkeit der aus dem Vorratsbehälter (17) geförderten Mengen hineinführt.
- Vorrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß die Lanze (12) einen Doppelmantel mit zwei Ausströmöffnungen aufweist, von denen durch die eine das pulverförmige Metall oder Reduktionsmittel, das ggf. fluidisiert ist, und durch die andere Inertgase strömen.
- Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Ausströmöffnung(en) tangential aus der Lanze (12) münden, die vorzugsweise im Bad schwenkbar ist.
- Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß das Bad in einer Pfanne, einem Torpedowagen oder einem Konverter angeordnet ist.
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 (de) | 1998-04-02 | 1999-03-27 | Verfahren zum legieren von stählen und vorrichtung zur durchführung des verfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1068364A1 EP1068364A1 (de) | 2001-01-17 |
EP1068364B1 true EP1068364B1 (de) | 2001-11-21 |
Family
ID=7863331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99924705A Expired - Lifetime EP1068364B1 (de) | 1998-04-02 | 1999-03-27 | Verfahren zum legieren von stählen und vorrichtung zur durchführung des verfahrens |
Country Status (6)
Country | Link |
---|---|
US (1) | US6383253B1 (de) |
EP (1) | EP1068364B1 (de) |
AT (1) | ATE209260T1 (de) |
DE (2) | DE19814748A1 (de) |
ES (1) | ES2168015T3 (de) |
WO (1) | WO1999051785A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7736415B2 (en) * | 2007-09-05 | 2010-06-15 | Specialty Minerals (Michigan) Inc. | Rotary lance |
WO2016172790A1 (en) * | 2015-04-26 | 2016-11-03 | Hatch Ltd. | Process and apparatus for producing high-manganese steels |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE227452C (de) | ||||
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 (de) | 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 |
-
1998
- 1998-04-02 DE DE19814748A patent/DE19814748A1/de not_active Withdrawn
-
1999
- 1999-03-27 DE DE59900687T patent/DE59900687D1/de not_active Expired - Fee Related
- 1999-03-27 US US09/601,553 patent/US6383253B1/en not_active Expired - Fee Related
- 1999-03-27 AT AT99924705T patent/ATE209260T1/de not_active IP Right Cessation
- 1999-03-27 EP EP99924705A patent/EP1068364B1/de not_active Expired - Lifetime
- 1999-03-27 ES ES99924705T patent/ES2168015T3/es not_active Expired - Lifetime
- 1999-03-27 WO PCT/DE1999/000932 patent/WO1999051785A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP1068364A1 (de) | 2001-01-17 |
DE19814748A1 (de) | 1999-10-07 |
ES2168015T3 (es) | 2002-05-16 |
WO1999051785A1 (de) | 1999-10-14 |
ATE209260T1 (de) | 2001-12-15 |
DE59900687D1 (de) | 2002-02-21 |
US6383253B1 (en) | 2002-05-07 |
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