EP1541699B1 - Method for stirring steel - Google Patents
Method for stirring steel Download PDFInfo
- Publication number
- EP1541699B1 EP1541699B1 EP02768214A EP02768214A EP1541699B1 EP 1541699 B1 EP1541699 B1 EP 1541699B1 EP 02768214 A EP02768214 A EP 02768214A EP 02768214 A EP02768214 A EP 02768214A EP 1541699 B1 EP1541699 B1 EP 1541699B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- steel
- ladle
- metal
- blowing
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D27/00—Stirring devices for molten material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
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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
- C21C1/06—Constructional features of mixers for pig-iron
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/18—Charging particulate material using a fluid carrier
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D27/00—Stirring devices for molten material
- F27D2027/002—Gas stirring
Definitions
- the invention relates to methods of treating liquid metal in a pan outside the furnace in black metallurgy.
- the intensification of the agitation of the metal which allows a reduction in the time of steel working, has an important importance in the process of treating metal outside the furnace in a pan.
- the homogenization of the melt accelerates the processes of calming and removing non-metallic inclusions, as well as the desulfurization and dephosphorization of the steel, which ensures the achievement of the objectives of ladle metallurgy.
- the gas is passed through a blow mold of the "hollow stopper rod” type and, to avoid spattering of metal with increased gas supply, a disk-shaped front part (screen) is used on the stopper rod (see, for example, Stahl, No. 12, 1999 , Pp. 17-19).
- the main disadvantage of the method is the attempt to solve the task of intensifying the stirring of the metal by increasing the gas supply.
- most of the metal in the ladle is not covered by the stirring, especially not in its bottom zones. All in all reduces the above mentioned the effectiveness of the known method in solving the task.
- Also known is a method for stirring steel in a pan comprising introducing a soluble gas into the steel which deposits on the steel (as well as in soda water) upon vacuum treatment in the form of minute bubbles floating on the molten bath surface (see, eg, " Steelmaking on the Threshold of the Third Millennium ", Attachment 7 to the journal” News of Black Metallurgy Abroad “, 2000, p. 25 ).
- the main disadvantage of the known method lies in its obvious increase in price, i.a. because of the need to use a recirculating vacuum treatment (NK-PERM process of the company "Nippon Kokan”).
- the main disadvantage of this process is the high cost of the equipment used with a relatively low stirring effect.
- the main disadvantage of this method is the uneven stirring of the steel mass.
- a gas or gas-powder mixture through blowing devices arranged in the lower part of the molten bath, at least one of which is offset from the center of the pan (s. , eg, the specified source " Injection metallurgy ", p. 142 - 143 and Fig. 12).
- the known method has a significant drawback: in the course of the blowing through of the steel by means of the gas / gas-powder mixture, the metal is stirred unevenly over the pan volume. In particular, the areas (most active zone) of the liquid metal in the entry path of the gas / gas powder mixture into the steel are subjected to an intensive stirring movement. As the gas / gas powder mixture approaches the surface of the metal in the ladle, these regions widen, flow (reducing velocity) through the upper layers of the molten bath, and descend from the surface as weakened descending streams. Of course, this described image of the movement of the stirred metal reduces the effectiveness of the stirring of the steel because it very slowly detects the total metal volume in the ladle, and especially the bottom zones of the molten bath. Overall, the stated object of accelerating the homogenization of the metal composition is not achieved.
- the known process requires an increased use of gas and in particular of time, which is not sufficiently available in the current technological production process of the steel substantially.
- the inventive method for stirring metal in a pan does not have the disadvantages mentioned.
- the active zone of the detection of the metal volume by the gas / gas powder mixture is significantly widened. This leads to the reduction of the time to reach a homogenized metal composition without increasing the amount of gas supplied, ie the technical task of intensifying the stirring of steel in a pan by blowing a gas / gas-powder mixture is dissolved.
- the aforesaid technical results are achieved by providing in the method of stirring steel in a ladle comprising blowing the steel from below by means of a gas / gas-powder mixture through at least two provided blowing devices arranged on diametrically opposite sides of the ladle wherein according to the invention, the blowing is effected alternately first by one of the blowing devices arranged on one side of the pan and then by the other blowing device located on the other side of the pan.
- One keeps in the blowing device is not blown through the moment, a pressure that excludes the inflow of metal into this device.
- the period of operation change between the blowing devices is increased with the increase of the steel mass in the ladle.
- the volume of the supplied gas is left unchanged when switching the supply of the gas or gas-powder mixture from one blowing device to the other.
- a pan is shown with metal in which two blowing devices are provided as a plug in the pan bottom.
- Fig. 2 is an analog pan with two blowers in the form of nozzles shown.
- Fig. 3 is the view in the direction of arrow A gem.
- Fig. 1 shown.
- Fig. 4 shows the view in the direction of arrow A acc. Fig. 2 , In this case, the pan on at least two blowing devices.
- the ladle 1 is filled with the liquid steel 2.
- the pan bottom ( Fig. 1 ) are on diametrically opposite sides of the pan 1 ( Fig. 3 ) at least two blowing devices 3 are provided. The number of these devices may be higher but must be straight.
- blow molds 4 may be provided in the pan 1 arranged on diametrically opposite sides of the pan 1 blow molds 4 may be provided. The number of blow molds may be higher but must be even.
- the gas or gas-powder mixture 5 is the pan by plugs in the pan bottom ( Fig.1 ) or blowing nozzles 4 ( Fig. 2 ). The gas or the gas-powder mixture can be fed separately to the pan. In this case, increase the number of devices 3 (blow molds 4) to the next even number.
- Fig. 1 are on diametrically opposite sides of the pan 1 ( Fig. 3 ) at least two blowing devices 3 are provided. The number of these devices may be higher but must be straight.
- blow molds 4 In the
- the process for stirring steel in a pan is carried out in the following way.
- the steel 2 is poured.
- the elements necessary for doping, desulfurization and dephosphorization of the steel are introduced into the steel by known methods or as a powder by the described devices 3 (or 4), or by both methods simultaneously.
- the supply of the gas (gas-powder mixture) 5 through the plug 3 (the blow mold 4), for example, in Fig. 1 - 4 left is switched on.
- the main currents are formed in the molten metal, which are represented by the lines 6.
- a gas pressure is maintained in the plug 3 (in the blowing nozzle 4) on the opposite side of the pan, which excludes the inflow of the steel into this.
- the direction of the main flows of the metal in the ladle bath by supplying the gas (gas-powder mixture) 5 through the plug 3 (blow mold 4), which is arranged on the opposite side of the pan (in Fig.
- the period of the change of direction of the supply of the gas (gas-powder mixture) is practically determined.
- the periodicity of the indicated change is increased with the increase of the steel mass in the ladle, because only in this case the metal streams 6 and 7 have the desired shape (shown on FIG Fig. 1 and 2 ) and the change of direction of the supply of the gas (gas-powder mixture) has a minimal effect on their mutual damping.
- a "cold model" of a pan 1 had the on the Fig. 1 shown dimensions.
- Tap water 2 was filled into the pan up to the height of 430 mm.
- the pan was equipped with three platinum electrodes: one in the lower part of the pan (distance from the water level 370 mm), one in the middle part of the pan (distance from the water level 220 mm) and one in the upper part of the pan (distance from the water level 60 mm), which were calibrated in advance in the areas of tap water - 0.1 wt.% Aqueous KCl solution. All three electrodes were 55 mm away from the inner wall of the cup model.
- a portable electrode was provided, with the addition of the homogenization of the solution was evaluated in the centers of the pan model, in the bottom part, on the water surface, as well as in the joints of the bottom and the walls of the pan.
- a 20% KCl concentrate was prepared and lowered in a thin rubber balloon onto the bottom of the pan model in the area near the ladle wall which was 90 ° from the devices 3.
- the balloon was cut.
- the use of the balloon has ensured a minimal disturbing effect on the water bath.
- the gas (air) was supplied through the devices in the soil in an amount of 6 l / min. With a larger air supply, the bubbling regimen was disturbed.
- Example 1 Under the conditions given in Example 1, an alternating air supply was carried out with a period of 30 seconds. In the change of direction, the amount of the supplied air at 6 l / min. held. After 35 minutes, a homogeneous solution with the above concentration was obtained in the pan model, i. the stirring time was reduced 2.4 times compared to Example 1.
- Example 1 Under the conditions given in Examples 1 and 2, an alternating air supply with a period of 40 seconds was performed. After 55 min. In the pan, a homogeneous solution with the above concentration was obtained, i. the stirring time was reduced 1.5 times compared to Example 1.
- the water volume lacked zones with a KCI concentration that differed from the concentration of 0.1 wt% KCI.
- Example 1 Under the conditions given in Examples 1 and 2, an alternating air supply was performed with a period of 50 seconds. After 60 min. In the pan, a homogeneous solution with the above concentration was obtained, i. the stirring time was reduced 1.4 times compared to Example 1.
- the water volume lacked zones with a KCI concentration that differed from the concentration of 0.1 wt% KCI.
- the method according to the invention for stirring steel in a ladle allows a simple intensification of the stirring process of the steel (a reduction of the time for carrying out) without a loss of stirring quality.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
Description
Die Erfindung bezieht sich auf Verfahren zur Behandlung flüssigen Metalls in einer Pfanne außerhalb des Ofens in der Schwarzmetallurgie.The invention relates to methods of treating liquid metal in a pan outside the furnace in black metallurgy.
Es ist bekannt, dass bei der Behandlung von Stahl außerhalb des Ofens Inertgas und technologische Pulver in die Schmelze entweder durch in die Schmelze eingetauchte Blasformen oder durch spezielle im Pfannenboden angeordnete Stopfen zugeführt werden.It is known that in the treatment of steel outside the furnace, inert gas and technological powders are fed into the melt either by blow molds submerged in the melt or by special plugs arranged in the ladle bottom.
Die Intensivierung des Rührvorgangs des Metalls, welche eine Reduktion der Zeit der Stahlbearbeitung ermöglicht, hat eine wichtige Bedeutung im Prozeß der Behandlung von Metall außerhalb des Ofens in einer Pfanne. Die Homogenisierung der Schmelze beschleunigt die Vorgänge der Beruhigung und der Beseitigung nichtmetallischer Einschlüsse, sowie der Desulfurierung und Entphosphorung des Stahls, was die Erreichung der Ziele der Pfannenmetallurgie gewährleistet.The intensification of the agitation of the metal, which allows a reduction in the time of steel working, has an important importance in the process of treating metal outside the furnace in a pan. The homogenization of the melt accelerates the processes of calming and removing non-metallic inclusions, as well as the desulfurization and dephosphorization of the steel, which ensures the achievement of the objectives of ladle metallurgy.
Bekannt ist ein Verfahren zur Intensivierung des Rührens von Metall in einer Pfanne durch Erhöhung des Gasdurchsatzes für das Durchblasen. Im bekannten Verfahren führt man das Gas durch eine Blasform vom Typ "hohle Stopfenstange" zu und zur Vermeidung des Verspritzens von Metall bei erhöhter Gaszufuhr verwendet man ein scheibenförmiges Stirnteil (Schirm) an der Stopfenstange (siehe, z.B., Stahl, Nr. 12, 1999, S. 17-19).Known is a method for intensifying the stirring of metal in a pan by increasing the gas flow rate for blowing through. In the known process, the gas is passed through a blow mold of the "hollow stopper rod" type and, to avoid spattering of metal with increased gas supply, a disk-shaped front part (screen) is used on the stopper rod (see, for example, Stahl, No. 12, 1999 , Pp. 17-19).
Der Hauptnachteil des Verfahrens ist der Versuch, die Aufgabe der Intensivierung des Rührens des Metalls durch Erhöhung der Gaszufuhr zu lösen. Außerdem wird in diesem Fall der größte Teil des Metalls in der Pfanne nicht von der Rührbewegung umfaßt, insbesondere nicht in ihren Bodenzonen. Insgesamt reduziert das oben Angeführte die Effektivität des bekannten Verfahrens bei der Lösung der gestellten Aufgabe.The main disadvantage of the method is the attempt to solve the task of intensifying the stirring of the metal by increasing the gas supply. In addition, in this case, most of the metal in the ladle is not covered by the stirring, especially not in its bottom zones. All in all reduces the above mentioned the effectiveness of the known method in solving the task.
Weiterhin bekannt ist ein Verfahren zum Rühren von Stahl in einer Pfanne, umfassend die Einführung eines löslichen Gases in den Stahl, das sich bei Vakuumbehandlung in Form kleinster auf die Schmelzbadoberfläche aufschwimmender Blasen im Stahl (wie auch in Sodawasser) abscheidet (siehe, z.B., "
Der Hauptnachteil des bekannten Verfahrens liegt in seiner offensichtlichen Verteuerung, u.a. wegen der Notwendigkeit, eine Umlaufvakuumbehandlung einzusetzen (NK-PERM-Prozess der Firma "Nippon Kokan").The main disadvantage of the known method lies in its obvious increase in price, i.a. because of the need to use a recirculating vacuum treatment (NK-PERM process of the company "Nippon Kokan").
Bekannt ist auch ein Verfahren zum Rühren von Stahl in einer Pfanne durch dessen Rühren mittels elektromagnetischer Kräfte (siehe, z.B., "Injektionsmetallurgie", Übersetzung aus dem Englischen, herausgegeben von
Der Hauptnachteil dieses Verfahrens sind die hohen Kosten der eingesetzten Ausrüstung bei einem relativ niedrigen Rühreffekt.The main disadvantage of this process is the high cost of the equipment used with a relatively low stirring effect.
Bekannt ist auch ein Verfahren zum Rühren von Stahl in einer Pfanne, in welchem das Durchblasen abwechselnd aus verschiedenen Blasvorrichtungen erfolgt (
Der wesentliche Nachteil dieses Verfahrens ist das ungleichmäßige Rühren der Stahlmasse.The main disadvantage of this method is the uneven stirring of the steel mass.
Weiterhin bekannt ist ein Verfahren zum Rühren von Stahl in einer Pfanne, umfassend das Durchblasen des Stahls von unten mittels eines Gases oder Gas-Pulver-Gemisches durch im unteren Teil des Schmelzbades angeordnete Blasvorrichtungen, von denen mindestens eine aus der Pfannenmitte versetzt ist (s., z.B., die angegebene Quelle "
Dieses bekannte Verfahren zum Rühren von Metall in einer Pfanne durch die Zufuhr von Gas oder eines Gas-Pulver-Gemisches kommt den wesentlichen Merkmalen nach dem erfindungsgemäßen Verfahren am nächsten und wird deswegen als nächstliegender Stand der Technik angenommen.This known method for stirring metal in a pan by the supply of gas or a gas-powder mixture comes closest to the essential features according to the method according to the invention and is therefore assumed to be the closest prior art.
Dem bekannten Verfahren ist ein wesentlicher Nachteil eigen: im Laufe des Durchblasens des Stahls mittels des Gases/Gas-Pulver-Gemisches wird das Metall über das Pfannenvolumen ungleichmäßig gerührt. Vor allem die im Eintrittsweg des Gases/Gas-Pulver-Gemisches in den Stahl befindlichen Bereiche (aktivste Zone) des flüssigen Metalls werden einer intensiven Rührbewegung unterzogen. Bei der Annäherung des Gases/Gas-Pulver-Gemisches an die Oberfläche des Metalls in der Pfanne verbreitern sich diese Bereiche, durchströmen (unter Verringerung der Geschwindigkeit) die oberen Schichten des Schmelzbades und sinken von der Oberfläche als abgeschwächte absteigende Ströme herab. Selbstverständlich verringert dieses geschilderte Bild der Bewegung des gerührten Metalls die Effektivität des Rührens des Stahls, weil es das gesamte Metallvolumen in der Pfanne und insbesondere die Bodenzonen des Schmelzbades sehr langsam erfasst. Insgesamt wird die gestellte Aufgabe der Beschleunigung der Homogenisierung der Metallzusammensetzung nicht erreicht. Der bekannte Prozess erfordert einen erhöhten Einsatz an Gas und insbesondere an Zeit, welche im aktuellen technologischen Fertigungsvorgang des Stahls im wesentlichen nicht ausreichend zur Verfügung steht.The known method has a significant drawback: in the course of the blowing through of the steel by means of the gas / gas-powder mixture, the metal is stirred unevenly over the pan volume. In particular, the areas (most active zone) of the liquid metal in the entry path of the gas / gas powder mixture into the steel are subjected to an intensive stirring movement. As the gas / gas powder mixture approaches the surface of the metal in the ladle, these regions widen, flow (reducing velocity) through the upper layers of the molten bath, and descend from the surface as weakened descending streams. Of course, this described image of the movement of the stirred metal reduces the effectiveness of the stirring of the steel because it very slowly detects the total metal volume in the ladle, and especially the bottom zones of the molten bath. Overall, the stated object of accelerating the homogenization of the metal composition is not achieved. The known process requires an increased use of gas and in particular of time, which is not sufficiently available in the current technological production process of the steel substantially.
Das erfindungsgemäße Verfahren zum Rühren von Metall in einer Pfanne weist die genannten Nachteile nicht auf. Bei diesem Verfahren ist die aktive Zone der Erfassung des Metallvolumens durch das Gas/Gas-Pulver-Gemisch wesentlich verbreitert. Dies führt zur Verringerung der Zeit zur Erreichung einer homogenisierten Metallzusammensetzung ohne Erhöhung der zugeführten Gasmenge, d.h. die technische Aufgabe der Intensivierung des Rührens von Stahl in einer Pfanne mittels Durchblasens eines Gases/Gas-Pulver-Gemisches wird gelöst.The inventive method for stirring metal in a pan does not have the disadvantages mentioned. In this method, the active zone of the detection of the metal volume by the gas / gas powder mixture is significantly widened. This leads to the reduction of the time to reach a homogenized metal composition without increasing the amount of gas supplied, ie the technical task of intensifying the stirring of steel in a pan by blowing a gas / gas-powder mixture is dissolved.
Die genannten technischen Ergebnisse werden dadurch erreicht, dass im Verfahren zum Rühren von Stahl in einer Pfanne, umfassend das Durchblasen des Stahls von unten mittels eines Gases/Gas-Pulver-Gemisches durch mindestens zwei vorgesehene Blasvorrichtungen, die auf diametral entgegengesetzten Seiten der Pfanne angeordnet sind, wobei erfindungsgemäß das Durchblasen abwechselnd zuerst durch eine der Blasvorrichtungen, die auf einer Seite der Pfanne angeordnet ist, und danach durch die andere Blasvorrichtung, die sich auf der anderen Seite der Pfanne befindet, erfolgt. Dabei hält man in der Blasvorrichtung, durch die momentan nicht durchgeblasen wird, einen Druck, der das Einfließen von Metall in diese Vorrichtung ausschließt. Die Periode des Betriebswechsels zwischen den Blasvorrichtungen vergrößert man mit der Erhöhung der Stahlmasse in der Pfanne. Das Volumen des zugeführten Gases wird bei der Umschaltung der Zufuhr des Gases oder Gas-Pulver-Gemisches von einer Blasvorrichtung auf die andere unverändert belassen.The aforesaid technical results are achieved by providing in the method of stirring steel in a ladle comprising blowing the steel from below by means of a gas / gas-powder mixture through at least two provided blowing devices arranged on diametrically opposite sides of the ladle wherein according to the invention, the blowing is effected alternately first by one of the blowing devices arranged on one side of the pan and then by the other blowing device located on the other side of the pan. One keeps in the blowing device, is not blown through the moment, a pressure that excludes the inflow of metal into this device. The period of operation change between the blowing devices is increased with the increase of the steel mass in the ladle. The volume of the supplied gas is left unchanged when switching the supply of the gas or gas-powder mixture from one blowing device to the other.
Das erfindungsgemäße Verfahren zum Rühren von Metall in einer Pfanne mittels Durchblasens von Gas oder eines Gas-Pulver-Gemisches wird an Hand von schematischen Zeichnungen näher erläutert.The inventive method for stirring metal in a pan by blowing gas or a gas-powder mixture is explained in more detail with reference to schematic drawings.
In
Die Stahlgießpfanne 1 ist mit dem flüssigen Stahl 2 gefüllt. Im Pfannenboden (
Das Verfahren zum Rühren von Stahl in einer Pfanne wird folgenderweise durchgeführt.The process for stirring steel in a pan is carried out in the following way.
In die Pfanne 1 wird der Stahl 2 eingegossen. Die für die Dotierung, Desulfurierung und Entphosphorung des Stahles notwendigen Elemente werden durch bekannte Verfahren oder als Pulver durch die beschriebenen Vorrichtungen 3 (oder 4), oder durch beide Verfahren gleichzeitig in den Stahl eingeführt.In the pan 1, the steel 2 is poured. The elements necessary for doping, desulfurization and dephosphorization of the steel are introduced into the steel by known methods or as a powder by the described devices 3 (or 4), or by both methods simultaneously.
Die Zufuhr des Gases (Gas-Pulver-Gemisches) 5 durch den Stopfen 3 (die Blasform 4), der sich zum Beispiel in
Die Periode des Richtungswechsels der Zufuhr des Gases (Gas-Pulver-Gemisches) wird praktisch bestimmt. Jedoch wird die Periodizität des angegebenen Wechsels mit der Erhöhung der Stahlmasse in der Pfanne erhöht, weil nur in diesem Fall die Metallströme 6 und 7 die gewünschte Form haben (gezeigt auf den
Es existiert eine Periode des Richtungswechsels, die für die vorgegebenen Bedingungen des Betriebs der Pfanne optimal ist. Eine Verringerung der Dauer dieser Periode ist nicht empfohlen, weil sich Zonen unvollständiger Homogenisierung der Schmelze im Stahlvolumen bilden. Eine Erhöhung der Dauer dieser Periode ist zulässig und wird durch den allgemeinen technologischen Rhythmus der Stahlerzeugung bestimmt.There is a period of change of direction that is optimal for the given conditions of operation of the pan. A reduction in the duration of this period is not recommended because zones of incomplete homogenization of the melt form in the steel volume. An increase in the duration of this period is permissible and determined by the general technological rhythm of steelmaking.
Ein "kaltes Modell" einer Pfanne 1 hatte die auf der
Es wurde ein 20%-iges KCI-Konzentrat zubereitet und in einem dünnen Gummiballon auf den Boden des Pfannenmodells in den Bereich nahe der Pfannenwand, der 90° von den Vorrichtungen 3 gelegen war, abgesenkt. Der Ballon wurde zerschnitten. Dabei wurde durch das 20%-ige KCI-Konzentrat nach seiner gleichmäßigen Verteilung über die Wassermasse eine Konzentration von 0, 1 % KCI im Wasser eingestellt, auf welche die Elektroden geeicht wurden. Die Verwendung des Ballons hat eine minimale störende Einwirkung auf das Wasserbad gewährleistet.A 20% KCl concentrate was prepared and lowered in a thin rubber balloon onto the bottom of the pan model in the area near the ladle wall which was 90 ° from the
Das Gas (Luft) wurde durch die Vorrichtungen im Boden in einer Menge von 6 l/min zugeführt. Bei einer größeren Luftzufuhr wurde das Blasenbildungsregime des Durchblasens gestört.The gas (air) was supplied through the devices in the soil in an amount of 6 l / min. With a larger air supply, the bubbling regimen was disturbed.
Unter den angegebenen Bedingungen und dem Durchblasen von Luft durch eine Vorrichtung 3 ohne Richtungswechsel wurde nach 84 Min. eine homogene 0,1 Gew. % KCI-Lösung im Wasser der Pfanne erhalten. Dabei war die Lösung an allen zusätzlich gemessenen Stellen über die ganze Lösungsmasse praktisch gleich.Under the given conditions and the blowing of air through a
Unter den in Beispiel 1 angegebenen Bedingungen wurde eine abwechselnde Luftzufuhr mit einer Periode von 30 Sek. durchgeführt. Bei dem Richtungswechsel wurde die Menge der zugeführten Luft bei 6 l/min. gehalten. Nach 35 min wurde im Pfannenmodell eine homogene Lösung mit der obigen Konzentration erhalten, d.h. die Rührzeit wurde 2,4-fach im Vergleich zum Beispiel 1 verringert.Under the conditions given in Example 1, an alternating air supply was carried out with a period of 30 seconds. In the change of direction, the amount of the supplied air at 6 l / min. held. After 35 minutes, a homogeneous solution with the above concentration was obtained in the pan model, i. the stirring time was reduced 2.4 times compared to Example 1.
Unter den in den Beispielen 1 und 2 angegebenen Bedingungen wurde eine abwechselnde Luftzufuhr mit einer Periode von 20 Sek. durchgeführt. Nach 60 min. wurde in der Pfanne eine homogene Lösung mit der obigen Konzentration erhalten, d.h. die Rührzeit wurde 1,4-fach im Vergleich zum Beispiel 1 verringert. Am Ende des 60-minütigen Rührens wurden im Wasservolumen Zonen mit größeren und kleineren Konzentrationen als 0,1% KCI in Wasser festgestellt, die von den Hauptelektroden nicht registriert wurden.Under the conditions given in Examples 1 and 2, an alternating air supply was carried out with a period of 20 seconds. After 60 min. In the pan, a homogeneous solution with the above concentration was obtained, i. the stirring time was reduced 1.4 times compared to Example 1. At the end of the 60 minute stirring, zones of greater and lesser concentrations than 0.1% KCl in water were detected in the water volume, which were not registered by the main electrodes.
Unter den in den Beispielen 1 und 2 angegebenen Bedingungen wurde eine abwechselnde Luftzufuhr mit einer Periode von 10 Sek. durchgeführt. Nach 84 - 87 min. wurde in der Pfanne eine homogene Lösung mit der obigen Konzentration erhalten, d.h. die Rührzeit wurde im Vergleich zum Beispiel 1 praktisch beibehalten. Am Ende des Rührens wurden im Wasservolumen Zonen mit größeren und kleineren Konzentrationen als 0, 1 % KCI in Wasser festgestellt, die von den Hauptelektroden nicht registriert wurden.Under the conditions given in Examples 1 and 2, an alternating air supply with a period of 10 seconds was performed. After 84 - 87 min. In the pan, a homogeneous solution having the above concentration was obtained, that is, the stirring time was practically maintained as compared with Example 1. At the end of stirring, zones of greater and lesser concentrations than 0.1% KCl in water were detected in the water volume, which were not registered by the main electrodes.
Unter den in den Beispielen 1 und 2 angegebenen Bedingungen wurde eine abwechselnde Luftzufuhr mit einer Periode von 40 Sek. durchgeführt. Nach 55 min. wurde in der Pfanne eine homogene Lösung mit der obigen Konzentration erhalten, d.h. die Rührzeit wurde 1,5-fach im Vergleich zum Beispiel 1 verringert. Im Wasservolumen fehlten Zonen mit einer KCI-Konzentration, die sich von der Konzentration von 0,1 Gew.% KCI unterschied.Under the conditions given in Examples 1 and 2, an alternating air supply with a period of 40 seconds was performed. After 55 min. In the pan, a homogeneous solution with the above concentration was obtained, i. the stirring time was reduced 1.5 times compared to Example 1. The water volume lacked zones with a KCI concentration that differed from the concentration of 0.1 wt% KCI.
Unter den in den Beispielen 1 und 2 angegebenen Bedingungen wurde eine abwechselnde Luftzufuhr mit einer Periode von 50 Sek. durchgeführt. Nach 60 min. wurde in der Pfanne eine homogene Lösung mit der obigen Konzentration erhalten, d.h. die Rührzeit wurde 1,4-fach im Vergleich zum Beispiel 1 verringert. Im Wasservolumen fehlten Zonen mit einer KCI-Konzentration, die sich von der Konzentration von 0,1 Gew.% KCI unterschieden.Under the conditions given in Examples 1 and 2, an alternating air supply was performed with a period of 50 seconds. After 60 min. In the pan, a homogeneous solution with the above concentration was obtained, i. the stirring time was reduced 1.4 times compared to Example 1. The water volume lacked zones with a KCI concentration that differed from the concentration of 0.1 wt% KCI.
Das erfindungsgemäße Verfahren zum Rühren von Stahl in einer Pfanne gestattet durch eine einfache Verfahrensführung eine wesentliche Intensivierung des Rührvorganges des Stahls (eine Verringerung der Zeit zur Durchführung) ohne eine Einbuße an Rührqualität.The method according to the invention for stirring steel in a ladle allows a simple intensification of the stirring process of the steel (a reduction of the time for carrying out) without a loss of stirring quality.
Claims (1)
- Method for stirring steel in a ladle, comprising blowing through the steel from the bottom by means of a gas or a gas/powder mixture through at least two blowing devices which are arranged on diametrically opposed sides of the ladle, characterized in that blowing through alternately takes place first through one of the blowing devices which is arranged on one side of the ladle and thereafter through the other blowing device located on the other side of the ladle, wherein a pressure held in the blowing device not used for blowing through at the moment prevents metal to flow into this device; wherein the period of the operating change of the blowing devices is increased with the increase of the steel mass in the ladle and the volume of the supplied gas being left unchanged upon the changeover of the supply of the gas or the gas/powder mixture from one blowing device to the other.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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RU2002108332 | 2002-04-03 | ||
RU2002108332/02A RU2208054C1 (en) | 2002-04-03 | 2002-04-03 | Method for mixing steel in ladle |
PCT/RU2002/000400 WO2003083145A1 (en) | 2002-04-03 | 2002-08-29 | Method for feeling steel |
Publications (3)
Publication Number | Publication Date |
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EP1541699A1 EP1541699A1 (en) | 2005-06-15 |
EP1541699A4 EP1541699A4 (en) | 2005-09-21 |
EP1541699B1 true EP1541699B1 (en) | 2009-01-21 |
Family
ID=28673171
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Application Number | Title | Priority Date | Filing Date |
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EP02768214A Expired - Lifetime EP1541699B1 (en) | 2002-04-03 | 2002-08-29 | Method for stirring steel |
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EP (1) | EP1541699B1 (en) |
AT (1) | ATE421598T1 (en) |
AU (1) | AU2002332367A1 (en) |
DE (1) | DE50213248D1 (en) |
ES (1) | ES2321071T3 (en) |
RU (1) | RU2208054C1 (en) |
UA (1) | UA77545C2 (en) |
WO (1) | WO2003083145A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1750075A1 (en) * | 2005-08-05 | 2007-02-07 | Vesuvius Becker & Piscantor Grossalmeroder Schmelztiegelwerke GmbH & Co. KG | Crucible for the treatment of molten metal and process for the manufacture thereof |
EP2910651A1 (en) * | 2014-02-19 | 2015-08-26 | Siemens VAI Metals Technologies GmbH | Method for the circulation of a metal bath and furnace construction |
RU2653743C1 (en) * | 2017-03-20 | 2018-05-14 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method of mixing steel in the metallurgical unit |
CN111822665B (en) * | 2020-07-25 | 2021-12-21 | 莱芜钢铁集团银山型钢有限公司 | Argon blowing control method and argon control device for continuous casting tundish breathable upper nozzle pocket block |
CN115475933B (en) * | 2022-10-13 | 2024-04-26 | 莱芜钢铁集团银山型钢有限公司 | Protection method for argon blowing sealing of water gap of slab continuous casting machine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE786018A (en) * | 1971-07-09 | 1973-01-08 | Allegheny Ludlum Ind Inc | PROCESS FOR INJECTING A REACTIVE GAS IN A BATH OF MELTED METAL |
ZA75241B (en) * | 1974-08-14 | 1976-01-28 | Inland Steel Co | Leaded steel bar |
SU1024509A1 (en) * | 1981-12-23 | 1983-06-23 | Днепродзержинский Ордена Трудового Красного Знамени Индустриальный Институт Им.М.И.Арсеничева | Method for converting crude iron |
RU2023017C1 (en) * | 1992-03-11 | 1994-11-15 | Пак Юрий Алексеевич | Apparatus for desulfurizing melt slag |
JPH06235018A (en) * | 1993-02-09 | 1994-08-23 | Kawasaki Steel Corp | Method for controlling bottom-blowing gas in ladle refining |
RU2132394C1 (en) * | 1998-06-02 | 1999-06-27 | Открытое акционерное общество "Северсталь" | Method for melting steel in arc steel melting furnace |
CN1087034C (en) * | 1999-11-02 | 2002-07-03 | 北京科技大学 | Technology for desulfurizing molten steel in enclosed ladle by spraying powder |
-
2002
- 2002-04-03 RU RU2002108332/02A patent/RU2208054C1/en not_active IP Right Cessation
- 2002-08-29 AT AT02768214T patent/ATE421598T1/en active
- 2002-08-29 AU AU2002332367A patent/AU2002332367A1/en not_active Abandoned
- 2002-08-29 EP EP02768214A patent/EP1541699B1/en not_active Expired - Lifetime
- 2002-08-29 UA UA20041210939A patent/UA77545C2/en unknown
- 2002-08-29 WO PCT/RU2002/000400 patent/WO2003083145A1/en not_active Application Discontinuation
- 2002-08-29 DE DE50213248T patent/DE50213248D1/en not_active Expired - Lifetime
- 2002-08-29 ES ES02768214T patent/ES2321071T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
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WO2003083145A1 (en) | 2003-10-09 |
RU2208054C1 (en) | 2003-07-10 |
EP1541699A4 (en) | 2005-09-21 |
ATE421598T1 (en) | 2009-02-15 |
AU2002332367A1 (en) | 2003-10-13 |
EP1541699A1 (en) | 2005-06-15 |
DE50213248D1 (en) | 2009-03-12 |
ES2321071T3 (en) | 2009-06-02 |
UA77545C2 (en) | 2006-12-15 |
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