EP1541699B1 - Procede de brassage de l'acier - Google Patents

Procede de brassage de l'acier Download PDF

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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
Application number
EP02768214A
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German (de)
English (en)
Other versions
EP1541699A1 (fr
EP1541699A4 (fr
Inventor
Ewald Schumacher
Viktor Nikolaevich Khloponin
Edgar Schumacher
Ivan Vasilievich Zinkovsky
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.)
Techcom Import Export GmbH
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Techcom Import Export GmbH
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Filing date
Publication date
Application filed by Techcom Import Export GmbH filed Critical Techcom Import Export GmbH
Publication of EP1541699A1 publication Critical patent/EP1541699A1/fr
Publication of EP1541699A4 publication Critical patent/EP1541699A4/fr
Application granted granted Critical
Publication of EP1541699B1 publication Critical patent/EP1541699B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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.

Landscapes

  • 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)
  • Paper (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (1)

  1. Procédé pour le malaxage d'acier dans une poche, comprenant la purge de l'acier par en bas au moyen d'un gaz ou d'un mélange de gaz-poudre par au moins deux dispositifs de soufflage prévus, qui sont disposés sur des côtés diamétralement opposés de la poche, caractérisé en ce que la purge s'effectue alternativement d'abord par l'un des dispositifs de soufflage, qui est disposé sur un côté de la poche, et ensuite par l'autre dispositif de soufflage, qui se trouve sur l'autre côté de la poche, sachant que dans le dispositif de soufflage, par lequel on ne souffle pas momentanément, on maintient une pression qui exclut l'introduction de métal dans ce dispositif, la période du changement de service des dispositifs de soufflage étant allongée avec l'augmentation de la masse d'acier dans la poche et le volume du gaz amené étant laissé sans modification lors de la commutation de l'arrivée du gaz ou du mélange de gaz-poudre d'un dispositif de soufflage à l'autre.
EP02768214A 2002-04-03 2002-08-29 Procede de brassage de l'acier Expired - Lifetime EP1541699B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU2002108332/02A RU2208054C1 (ru) 2002-04-03 2002-04-03 Способ перемешивания стали в ковше
RU2002108332 2002-04-03
PCT/RU2002/000400 WO2003083145A1 (fr) 2002-04-03 2002-08-29 Procede de melangeage de l'acier dans la poche de coulee

Publications (3)

Publication Number Publication Date
EP1541699A1 EP1541699A1 (fr) 2005-06-15
EP1541699A4 EP1541699A4 (fr) 2005-09-21
EP1541699B1 true EP1541699B1 (fr) 2009-01-21

Family

ID=28673171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02768214A Expired - Lifetime EP1541699B1 (fr) 2002-04-03 2002-08-29 Procede de brassage de l'acier

Country Status (8)

Country Link
EP (1) EP1541699B1 (fr)
AT (1) ATE421598T1 (fr)
AU (1) AU2002332367A1 (fr)
DE (1) DE50213248D1 (fr)
ES (1) ES2321071T3 (fr)
RU (1) RU2208054C1 (fr)
UA (1) UA77545C2 (fr)
WO (1) WO2003083145A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1750075A1 (fr) * 2005-08-05 2007-02-07 Vesuvius Becker & Piscantor Grossalmeroder Schmelztiegelwerke GmbH & Co. KG Creuset pour le traitement de métal liquide et et son procédé de fabrication
EP2910651A1 (fr) * 2014-02-19 2015-08-26 Siemens VAI Metals Technologies GmbH Procédé de circulation d'un bain de métal et installation de four
RU2653743C1 (ru) * 2017-03-20 2018-05-14 Публичное акционерное общество "Северсталь" (ПАО "Северсталь") Способ перемешивания стали в металлургическом агрегате
CN111822665B (zh) * 2020-07-25 2021-12-21 莱芜钢铁集团银山型钢有限公司 一种用于连铸中间包透气上水口座砖的吹氩控制方法及氩气控制装置
CN115475933B (zh) * 2022-10-13 2024-04-26 莱芜钢铁集团银山型钢有限公司 一种板坯连铸机水口吹氩密封的保护方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE786018A (fr) * 1971-07-09 1973-01-08 Allegheny Ludlum Ind Inc Procede d'injection d'un gaz reactif dans un bain de metal fondu
ZA75241B (en) * 1974-08-14 1976-01-28 Inland Steel Co Leaded steel bar
SU1024509A1 (ru) * 1981-12-23 1983-06-23 Днепродзержинский Ордена Трудового Красного Знамени Индустриальный Институт Им.М.И.Арсеничева Способ передела чугуна в конвертере
RU2023017C1 (ru) * 1992-03-11 1994-11-15 Пак Юрий Алексеевич Устройство для десульфурации шлакового расплава
JPH06235018A (ja) * 1993-02-09 1994-08-23 Kawasaki Steel Corp 取鍋精錬における底吹きガス制御方法
RU2132394C1 (ru) * 1998-06-02 1999-06-27 Открытое акционерное общество "Северсталь" Способ выплавки стали в дуговой сталеплавильной печи
CN1087034C (zh) * 1999-11-02 2002-07-03 北京科技大学 盛钢桶浸渍罩密闭钢液喷粉脱硫方法及装置

Also Published As

Publication number Publication date
AU2002332367A1 (en) 2003-10-13
EP1541699A1 (fr) 2005-06-15
ES2321071T3 (es) 2009-06-02
ATE421598T1 (de) 2009-02-15
UA77545C2 (en) 2006-12-15
WO2003083145A1 (fr) 2003-10-09
RU2208054C1 (ru) 2003-07-10
EP1541699A4 (fr) 2005-09-21
DE50213248D1 (de) 2009-03-12

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