EP1391524A1 - Method for agitating steel in a ladle - Google Patents
Method for agitating steel in a ladle Download PDFInfo
- Publication number
- EP1391524A1 EP1391524A1 EP02739004A EP02739004A EP1391524A1 EP 1391524 A1 EP1391524 A1 EP 1391524A1 EP 02739004 A EP02739004 A EP 02739004A EP 02739004 A EP02739004 A EP 02739004A EP 1391524 A1 EP1391524 A1 EP 1391524A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ladle
- blowing
- steel
- gas
- rotation
- 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.)
- Granted
Links
Images
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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
-
- 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
- F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
- F27D2003/0087—Rotation about a vertical axis
-
- 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 ferrous metallurgy and more particularly to treatment of steel in a ladle.
- Ladle metallurgy has spread widely in recent years in steel manufacturing especially where it was comprising continuous teeming.
- stirring of steel in a ladle is performed using inert or indifferent gases or gas-powder mixtures.
- Gas or gas-powder mixture is supplied through tuyeres or porous plugs in the bottom of ladle and located in its middle or shifted to wall.
- the number of tuyeres is often set equal to 2.
- blowing the Argon in is carried out through 16 horizontal tuyeres.
- a method of stirring steel comprising the step of injection of a soluble gas into steel, said gas evolving under vacuumizing in the form of tiny bubbles rising to the surface of steel (see, for example, Staleplavil'noie proizvodstvo na poroge tret'ego tysyacheletiya, addition 7 to magazine Novosty chernoy metallurgiy za rubezhom - Steelmaking industry on the edge of the third millenium, addition 7 to magazine News of ferrous metallurgy abroad - 2000, p.25).
- the main drawback of the method is its relatively high expenses, as operation of this method assumes the use of circulation vacuumizing (process NK - PERM of firm "Nippon Kokan").
- this method is the closest to the one being claimed herein, consequently it is adopted as the prototype.
- the method being claimed herein is devoid of the mentioned drawbacks. It provides supply of gas (gas-powder mixture) grasping all the steel volume in a ladle, thus enabling maximal degree of steel stirring in a ladle, which becomes possible when the gas (gas-powder) supply into a ladle is used as a tool for stirring steel.
- the method comprises the use of inert or indifferent gases, and the compound of powder mixture is defined by technical problem to be solved.
- the above-mentioned technical objects are attained due to the method for stirring steel in a ladle, comprising blowing steel from beneath by a gas or gas-powder mixture through special blowing devices at least one of which is shifted relatively vertical axis of ladle towards its wall; according to the present invention along with blowing a rotation of the ladle relatively its vertical axis is carried out, while direction of rotation is periodically reversed.
- blowing For rotation through angle ⁇ exceeding 360 degrees blowing is performed through blowing devices placed on the radius of ladle's bottom or in the ladle's sector with central angle ⁇ .
- For rotation through angle ⁇ exceeding 180 degrees blowing is performed through blowing devices placed on the diameter of ladle's bottom.
- For rotation through angle ⁇ at least being 90 degrees blowing is performed through blowing devices placed on mutually perpendicular diameters of ladle's bottom.
- Fig. 11 features locations of blowing devices in the bottom of ladle for the cool model realization of the method being claimed.
- Periodical reversals of ladle rotation is denoted on fig. 3 - 10 by arrows with solid lines in one direction and dashed for reversals.
- Teeming ladle 1 (fig. 1) is executed in the form of body of revolution with walls 2 and bottom 3. Vertical axis of ladle is 4. Liquid steel 5 is in the ladle. Blowing device 6 contacts with steel from below through which inert or indifferent gas or gas-powder mixture 7 is supplied.
- Blowing device may be also executed in the form of plunged into metal thermally isolated tuyere 10 (fig. 2) mounted to the ladle's wall by means of mounting tools 11.
- Porous inserts or fireproof plugs may implement hidden or open blowing of steel. Their form is not necessarily to be round. All the mentioned facts change nothing in the essence of the method for stirring steel proposed.
- Dashed line on fig. 3 - 10 shows region in ladle, that experiences action of blowing devices while ladle is stationary, shaded zone - during realization of current method.
- the action of blowing devices may be intensive, for example, in the beginning of processing steel in ladle, and not intensive (bubble, soft), for example, at the end of processing. Realization of mentioned regimes of work of blowing devices does not concern the essence of proposed method for stirring steel in ladle.
- the method for stirring steel in ladle is realized in the following way.
- Teeming ladle 1 (fig. 1) after filling with liquid steel 5 is supplied to processing steel, that may include blowing the metal with inert gases, desulphuration and modifying steel by means of blowing steel with gas-powder mixture of appropriate compound.
- Ladle 1 is set on turntable 8, gas or gas-powder mixture (7) is drawn to blowing devices 6 and processing based on steel stirring effect in ladle takes place while gas is supplied to steel.
- the ladle 1 rotation with reversals may be accomplished through electric-mechanical drive (fig. 1 and 2), hydro-mechanical mechanisms (using hydraulic cylinders and rack and pinion mechanism), crank and other devices.
- electric-mechanical drive fig. 1 and 2
- hydro-mechanical mechanisms using hydraulic cylinders and rack and pinion mechanism
- crank and other devices Each of realizations includes as drawbacks so and merits not analyzed here, for drive realization makes no influence on the essence of proposed method for stirring steel in ladle.
- At least one blowing device is to be shifted from longitudinal axis 4 of ladle (the solution known from experience in processing of steel in ladle).
- blowing devices are preferably located in the bottom of ladle (fig. 1).
- plunged into steel blowing tuyeres 10 may be also used, in which case they are mounted to ladle walls with the help of mounting facilities 11 (fig. 2).
- Using of blowing tuyeres is less desirable in our case due to following reasons: firstly, they diminish inertia forces preventing steel rotation with turning of ladle, secondly, tuyere mounting to ladle walls is technical problem of some difficulty.
- Figures 1 and 3 present the essence of method for stirring steel in ladle using the example with one blowing device 6 in the form of bottom plug shifted from longitudinal axis 4 of ladle 1, that moves steel 5 relatively.
- Realizations of figures 5 - 10 introduce no changes into the essence of the method being proposed but indicate ways to intensify stirring of steel in ladle due to different ways of execution of blowing devices.
- blowing device 6 When gas (gas-powder mixture) 7 through the blowing device 6 is drawn, it raises up enhancing the zone spanned by its influence (the dashed line on fig. 1 - 10 denotes the zone of stirring steel in ladle if blowing device is stationary). If rotated through one turn blowing device 6 sequentially goes through positions a - d, and in position e comes to initial point a, after which the rotation is reversed and device 6 goes through these positions in reverse order.
- blowing devices located along the radius of ladle bottom feed steel 5 with gas all through the ladle volume while the latter is reversibly rotated through one turn (on fig. 5 the influenced area of steel 5 by gas 7 is shaded).
- blowing devices 6 are located along perpendicular diameters of ladle bottom and reversible quarter-turn lets gas to stir the whole ladle volume. As with case on fig. 6 for this version rotation though angles more than quarter-turn but less than one turn is not ruled out.
- blowing devices are located in sector with central angle Alpha and to influence the whole steel volume it needs reversible rotation of ladle through the angle not less than 360° - Alpha (and more, but not exceeding one turn).
- Central angle Alpha of the sector may be increased or decreased and the ladle turn angle is decreased or increased respectively.
- Figures 3 - 10 cover not all possible versions for locations of ladle bottom blowing devices, but in any case not less than one of them is located shifted from longitudinal axis of ladle towards its wall, as it is this solution, that provides shifting of blowing devices in horizontal plane steel relatively while rotating the ladle relatively its vertical axis.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
along the radius of ladle's bottom (fig. 5),
along the diameter of ladle's bottom (fig. 6),
on mutually perpendicular diameters of ladle's bottom (fig. 7),
within the sector of the bottom with central angle α (fig. 8), including α = 90 degrees (fig. 9),
randomly, if justified (fig. 10).
In the bottom of the model on mutually perpendicular diameter there were placed 9 blowing devices one of which was located in the center of the model. In addition, one blowing device was placed in one of sectors formed by mentioned diameters (fig. 11). Each blowing device to which air was supplied is executed in the form of cavity with 13 holes 1.5 mm in diameter and placed every 15 mm. Every blowing device is equipped with separate air supply with options of complete switching off and intensity regulation. There was performed regimes of blowing water with air at pressures less than 10 kPa.
The ladle model was placed onto the table with rotation drive.
Bubble blowing of water was performed through one blowing device placed in the sector. In the water - its upper part, middle and near the bottom - ink is injected and its dispersion time is measured. Ink is introduced near the ladle wall opposite to the blowing device through which air was supplied at three levels: surface layers (1/4 of slag height), middle part and near the bottom of the bath.
If ladle is stationary, ink was dispersed in 25 seconds in the upper part, about 25 seconds in the middle, and about 40 seconds near the bottom, where stagnation zone was formed as in 40 seconds dispersion was not finished. Water counterflows were observed near the wall where ink was injected , but sunflower oil did not mix with water.
For reversible rotation of ladle through one turn with average angular velocity of 1.25 sec-1 dispersion of ink at all levels took about 10 seconds, i.e. by the end of first turn of blowing device to initial position. The stagnation zone wasn't formed. No distinct counterflows were observed. Stirring took place all through water volume. Sunflower oil didn't mix with water.
Thus, motion of blowing device in horizontal plane steel (water) relatively accomplished by reversible rotation of ladle (model) relatively its longitudinal axis intensified significantly the process of stirring, especially in the bottom part of the ladle.
When ladle is stationary dispersion of ink took about 60 seconds with formation of bottom stagnation zone, where ink remained after 60 seconds. Water counterflows were observed near the wall where ink was injected. Sunflower oil did not mix with water.
For reversible ladle rotation through one turn with average angular velocity about 1.25 c-1 full dispersion of ink took 15 seconds including the bottom part of the model. Stirring took place all through the volume. Sunflower oil did not mix with water.
If ladle is stationary, ink was dispersed in 10 seconds in the upper part, about 10 seconds in the middle, and about 20 seconds near the bottom, with formation of stagnation zone at the bottom. Water counterflows were observed near the wall where ink was injected. Sunflower oil did not mix with water.
For reversible ladle rotation through half a turn with average angular velocity about 0.8 c-1 the ink was dispersed in 10 seconds in the upper part, about 10 seconds in the middle, and about 7 seconds near the bottom including bottom itself. Stirring took place all through the volume. Sunflower oil did not mix with water.
Thus, shifting blowing devices in horizontal plane steel (water) relatively accomplished through reversible rotation of ladle (model) relatively its vertical axis in this case intensifies stirring of steel significantly especially in the lower part of ladle.
When ladle is stationary water and oil mix notably. In addition, above the blowing device on the surface of bath a zone free of oil is formed. The main part of oil is shifted towards the opposite from blowing device wall of ladle, where caught in big fractions by water counterflows and entrained to the depth of about 2/3 of bath height, and then shifted to upgoing flows of water above the blowing device and rises upwards.
For reversible ladle rotation through one turn with average angular velocity about 1.25 c-1 the mentioned oil fraction being concentrated near the opposite from blowing device wall is destroyed. The oil is caught more smoothly by water flows and in smaller fractions goes almost to the bottom, then going upward in places where with ladle rotation rising water flows are formed. Stirring took place all through the volume.
For stationary ladle mixing of water and oil described in example 4 grows notably. For reversible rotation of ladle relatively its longitudinal axis through one turn mixing of water and oil grows all through the bath volume and additionally oil fractions in water become smaller.
An important feature of the proposed method for stirring steel in ladle is its relatively easy technical realization - moving blowing devices in horizontal plane steel relatively in order to influence the whole steel volume by means of rotating of ladle with steel relatively its vertical axis with periodical reversals in rotation.
Relative simplicity of technical realization of the method for stirring steel in ladle lets it to be considered for use in the process of teeming steel into the intermediate ladle. Additionally, stirring of steel allows metal to be refined due to absorption on boundaries bubbles - metal of non-metal phases as well as additionally degassed from nitrogen and hydrogen. Realization of method proposed for stirring of steel in this case presumes the use of steel teeming ladles with central teeming glass.
Claims (5)
- Method for agitating steel in a ladle, comprising blowing steel with gas or gas-powder from below through special blowing devices, at least one of which is shifted relatively vertical axis of the ladle towards its wall, said method furthermore comprising simultaneous with blowing rotation of ladle relatively its vertical axis with periodical reversals.
- The method of claim 1, wherein rotation of the ladle is accomplished through the angle α being at least 360 degrees, while blowing is performed through blowing devices placed on the radius of the ladle bottom.
- The method of claim 1, wherein rotation of the ladle is accomplished through the angle α being at least 180 degrees, while blowing is performed through blowing devices placed on the diameter of the ladle bottom.
- The method of claim 1, wherein rotation of ladle is accomplished through the angle α being at least 90 degrees, while blowing is performed through blowing devices placed on mutually perpendicular diameters of the ladle bottom.
- The method of claim 1, wherein rotation of ladle is accomplished through the angle α being at least 360 degrees, while blowing is performed through blowing devices placed within a sector with central angle α.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2001110779 | 2001-04-24 | ||
RU2001110779/02A RU2197540C2 (en) | 2001-04-24 | 2001-04-24 | Method of mixing steel in ladle |
PCT/RU2002/000180 WO2002086171A1 (en) | 2001-04-24 | 2002-04-18 | Method for agitating steel in a ladle |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1391524A1 true EP1391524A1 (en) | 2004-02-25 |
EP1391524A4 EP1391524A4 (en) | 2004-07-07 |
EP1391524B1 EP1391524B1 (en) | 2005-04-06 |
Family
ID=20248742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02739004A Expired - Lifetime EP1391524B1 (en) | 2001-04-24 | 2002-04-18 | Method for agitating steel in a ladle |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1391524B1 (en) |
AT (1) | ATE292692T1 (en) |
DE (1) | DE60203613T2 (en) |
RU (1) | RU2197540C2 (en) |
UA (1) | UA76460C2 (en) |
WO (1) | WO2002086171A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107653355B (en) * | 2017-11-01 | 2022-12-20 | 中冶京诚工程技术有限公司 | Rotatable arc furnace bottom and arc furnace |
KR20220129057A (en) * | 2020-02-25 | 2022-09-22 | 노벨리스 인크. | Multipurpose pump system for metal furnaces and related methods |
CN112760454A (en) * | 2020-12-23 | 2021-05-07 | 二重(德阳)重型装备有限公司 | Purification method for molten steel of die casting tundish |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB760561A (en) * | 1953-11-17 | 1956-10-31 | Air Liquide | Ladle and method for the treatment of molten metals |
SU629889A3 (en) * | 1973-07-06 | 1978-10-25 | Кобе Стил Лтд (Фирма) | Method of working metal |
SU557867A1 (en) * | 1975-05-04 | 1977-05-15 | Украинский Государственный Институт По Проектированию Металлургических Заводов | The method of purging the liquid metal in the ladle with an inert gas and the device for its implementation |
SU1044638A2 (en) * | 1982-04-05 | 1983-09-30 | Институт проблем литья АН УССР | Method for carburizing melt |
RU2023017C1 (en) * | 1992-03-11 | 1994-11-15 | Пак Юрий Алексеевич | Apparatus for desulfurizing melt slag |
CZ286188B6 (en) * | 1997-10-24 | 2000-02-16 | Třinecké Železárny Inženýring, A. S. | Apparatus for carrying out chemical heating |
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 |
-
2001
- 2001-04-24 RU RU2001110779/02A patent/RU2197540C2/en not_active IP Right Cessation
-
2002
- 2002-04-18 UA UA20031110601A patent/UA76460C2/en unknown
- 2002-04-18 WO PCT/RU2002/000180 patent/WO2002086171A1/en not_active Application Discontinuation
- 2002-04-18 DE DE60203613T patent/DE60203613T2/en not_active Expired - Lifetime
- 2002-04-18 AT AT02739004T patent/ATE292692T1/en active
- 2002-04-18 EP EP02739004A patent/EP1391524B1/en not_active Expired - Lifetime
Non-Patent Citations (2)
Title |
---|
No further relevant documents disclosed * |
See also references of WO02086171A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1391524B1 (en) | 2005-04-06 |
EP1391524A4 (en) | 2004-07-07 |
DE60203613T2 (en) | 2006-01-19 |
DE60203613D1 (en) | 2005-05-12 |
ATE292692T1 (en) | 2005-04-15 |
UA76460C2 (en) | 2006-08-15 |
RU2197540C2 (en) | 2003-01-27 |
WO2002086171A1 (en) | 2002-10-31 |
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