CN109868341B - Device and method for refining molten steel by full-bottom blowing ladle - Google Patents
Device and method for refining molten steel by full-bottom blowing ladle Download PDFInfo
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- CN109868341B CN109868341B CN201910177263.2A CN201910177263A CN109868341B CN 109868341 B CN109868341 B CN 109868341B CN 201910177263 A CN201910177263 A CN 201910177263A CN 109868341 B CN109868341 B CN 109868341B
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Abstract
The invention belongs to the technical field of steel refining, and particularly relates to a device and a method for refining molten steel by using a full-bottom-blowing ladle. The device is including the ladle that is used for the molten steel refining, the ladle includes ladle wall and ladle package end, the ladle lateral wall includes refractory material bricklaying, ladle package end is located the below of molten steel, and ladle package end embeds and is equipped with a full bottom-blown ventilation element, the outside parcel of full bottom-blown ventilation element has the steel bushing. When the device is used, argon enters the steel ladle from the bottom of the steel ladle through the full-bottom-blowing air permeable element, and compared with the traditional air permeable brick, argon bubbles are dispersedly distributed inside the whole steel ladle in the refining process of the full-bottom-blowing steel ladle, so that molten steel is uniformly stirred, the homogenization of molten steel components and temperature is promoted, the slag-metal interface reaction is accelerated, impurities in the molten steel can be efficiently captured, the purpose of refining the molten steel is achieved, and the secondary pollution of the molten steel cannot be caused.
Description
Technical Field
The invention belongs to the technical field of steel refining, and particularly relates to a device and a method for refining molten steel by using a full-bottom-blowing ladle.
Background
With the development of society, the quality requirements of steel products in the market are higher and higher, and particularly, the steel products comprise die steel, steel for large machinery, steel for nuclear power, steel for pressure vessels and the like. The steel used in the industries has the characteristic of strict requirements on the purity of molten steel. Therefore, the steel refining becomes an indispensable link, and the ladle bottom argon blowing refining is generally applied to the steel refining.
In the ladle furnace external refining process, for even molten steel chemical composition and temperature, promote the inclusion come-up in the steel, adopt ladle bottom blowing argon gas usually, but conventional bottom blowing argon gas can cause the formation of slag hole under the condition of high flow, arouse oxygen in the molten steel absorption air, nitrogen element, thereby cause the secondary pollution of molten steel, stirring molten steel that simultaneously can not be fine under the condition of low flow, make bottom blowing argon efficiency reduce, in addition because bubble distribution is too concentrated in the traditional bottom blowing ladle, inclusion in the molten steel can't high-efficiently be caught and get rid of.
Disclosure of Invention
Technical problem to be solved
Aiming at the existing technical problems, the invention provides a device and a method for refining molten steel by using a full-bottom-blowing steel ladle.
(II) technical scheme
The invention provides a device for refining molten steel by using a full bottom blowing ladle, which comprises a ladle for refining the molten steel, wherein the ladle comprises a ladle wall and a ladle bottom, the ladle wall comprises refractory material bricks, the ladle bottom is positioned below the molten steel, a full bottom blowing air permeable element is embedded in the ladle bottom, and a steel sleeve is wrapped outside the full bottom blowing air permeable element;
the full bottom-blowing air-permeable element comprises an element body and a plurality of supporting legs, wherein the element body is cylindrical or round table-shaped, the supporting legs are uniformly arranged at the bottom of the element body, and a thin air chamber is formed between the full bottom-blowing air-permeable element and the bottom of a steel ladle.
Further, tamping materials are filled between the refractory material brickwork and the full bottom blowing air permeable element.
Further, the height of the supporting legs is 1-50mm, and the height of the thin air chamber is the same as that of the supporting legs.
Further, a sliding nozzle unit is embedded on the full bottom-blowing air permeable element and comprises a sliding nozzle brick cup and a sliding nozzle.
Further, at least one slit penetrating through the full bottom blowing air-permeable element is arranged on the full bottom blowing air-permeable element.
Further, the width of the slit is 0.05-0.5 mm.
Furthermore, the bottom of the thin air chamber is connected with an argon pipeline, a one-way air valve is arranged on the argon pipeline, and airflow enters the thin air chamber through the one-way air valve and then is uniformly distributed in the thin air chamber.
The invention also provides a method for adopting the device for refining the molten steel by the full-bottom-blowing ladle in any technical scheme, and the argon for blowing sequentially enters the full-bottom-blowing breathable element and the interior of the ladle through the argon pipeline so as to stir the molten steel.
(III) advantageous effects
According to the device for refining the molten steel by the full-bottom-blowing steel ladle, argon enters the steel ladle from the bottom of the steel ladle through the full-bottom-blowing breathable element, so that the molten steel is stirred, the homogenization of the components and the temperature of the molten steel is promoted, and the purpose of refining the molten steel is achieved. The problems that the traditional bottom argon blowing ladle has small blowing amount under the soft blowing condition and the molten steel is not uniformly stirred are overcome; under the condition of strong blowing, bubbles form bubble columns in molten steel in the traditional bottom argon blowing ladle, push away top slag on the upper layer of the molten steel to form slag holes, and therefore the problem that the molten steel is contacted with air and is subjected to secondary pollution is caused.
The full bottom blowing ensures that the fluctuation of the liquid level of the molten steel is small while increasing the gas flow, does not cause splashing, improves the safety, lightens the labor intensity of workers, greatly reduces the area of slag holes, reduces the oxygen absorption and nitrogen absorption of the molten steel, can effectively remove inclusions through dispersing even and fine bubbles, and improves the quality of the molten steel and the alloy yield. Meanwhile, the molten steel in the steel ladle is not provided with dead zones by fully bottom-blowing the steel ladle, so that the molten steel is fully stirred, the quality of the molten steel is improved, the refining rhythm is accelerated, the production efficiency of enterprises is accelerated, the yield is improved, the cleanliness of the molten steel is improved, and the quality of steel products is improved. Meanwhile, under the condition of the same air blowing amount, the smelting time of the full bottom blowing ladle is shorter, the heat loss in the refining process is reduced, the electric energy is saved, the electrode loss is reduced, and the cost per ton of steel is reduced.
Drawings
FIG. 1 is a schematic view of an apparatus for refining molten steel by full bottom blowing ladle in example 1;
FIG. 2 is a schematic view of the bottom of the ladle in example 1;
FIG. 3 is a slit distribution diagram of the all bottom blowing air permeable member in example 1;
FIG. 4 is a slit distribution diagram of a full bottom blowing air permeable member in example 2;
FIG. 5 is a slit distribution diagram of a full bottom blowing air permeable member in example 3;
FIG. 6 is a slit profile of a full bottom blowing air permeable member of example 4.
[ description of reference ]
1: a ladle; 2: building bricks by using refractory materials; 3: a full bottom-blowing air-permeable element; 4: tamping the materials; 5: a thin air chamber; 6: an argon gas pipeline; 7: a one-way air valve; 8: a support leg; 9: a slit; 10: a sliding nozzle pocket brick; 11: a sliding gate valve.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a device for refining molten steel by using a full bottom-blown ladle, which comprises a ladle 1 for refining molten steel, wherein the ladle 1 comprises a ladle wall and a ladle bottom, the ladle wall is formed by stacking refractory material bricks 2, the ladle bottom is located below the molten steel, a full bottom-blown ventilating element 3 is embedded in the ladle bottom, the full bottom-blown ventilating element 3 has the same size as the ladle bottom, and the outside of the full bottom-blown ventilating element 3 is wrapped by a steel sleeve. The tamping material 4 is filled between the refractory material brickwork 2 and the full bottom-blowing air-permeable element 3, and the tamping chamber material 4 enables the position of the full bottom-blowing air-permeable element 3 in the steel ladle 1 to be more fixed without moving.
The full bottom-blown ventilation element 3 comprises a circular truncated cone-shaped element body and supporting legs 8, the 16 supporting legs 8 are uniformly arranged at the bottom of the element body and are sintered with the element body into a whole, and a thin air chamber 5 is formed between the full bottom-blown ventilation element 3 and the bottom of a steel ladle. The height of the thin air chamber 5 depends on the height of the legs 8, the height of the legs 8 being 50 mm. Preferably, the bottom-blown breathable element 3 is made of a refractory material.
And the full bottom blowing air permeable element is embedded with a sliding nozzle unit, and the sliding nozzle unit comprises a sliding nozzle brick cup and a sliding nozzle.
As shown in fig. 3, a plurality of slits 9 penetrating the all bottom blowing ventilation element 3 are provided in the all bottom blowing ventilation element 3, the slits 9 are provided in a slit pattern penetrating the all bottom blowing ventilation element 3, and the width of the slits 9 is 0.5 mm.
The full bottom-blown permeable element 3 is also embedded with a sliding nozzle brick cup 10, the bottom of the sliding nozzle brick cup 10 is connected with a sliding nozzle 11, and the sliding nozzle 11 is positioned outside the bottom of the ladle and used for accurately adjusting the water flow from the ladle 1 to the continuous casting tundish, so that the inflowing molten steel and the outflowing molten steel are balanced, and the continuous casting operation is easier to control.
The bottom of the thin gas chamber 5 is connected with an argon pipeline 6, and the argon pipeline 6 is provided with a one-way gas valve 7. Argon enters the thin gas chamber 5 through an argon pipeline 6, is uniformly distributed in the thin gas chamber 5, and then enters the full bottom blowing breathable element 3. The argon pipeline 6 is provided with a one-way air valve 7, and the one-way air valve 7 can control the entering of argon and maintain the pressure in the thin air chamber 5.
Adopt the refining device of this embodiment during refining, when the ladle gets into the refining station, the operation workman opens the one-way gas valve that sets up on the argon gas pipeline, let in argon gas, argon gas passes through one-way gas valve and gets into thin air chamber, form the linker, thin air chamber internal pressure and intraductal pressure equal, the slit entering molten steel in the ventilative component of argon gas distribution through blowing at the full bottom in thin air chamber, the bubble rises and stirs the molten steel, because the dimension that the slit distributes is very big, so the distribution of bubble in the molten steel is very even, and then the ventilative tolerance has been increaseed, the stirring to the molten bath has been strengthened, the efficiency of mingling in getting rid of the molten.
Example 2
In this embodiment, the apparatus shown in fig. 1 is used to refine molten steel, and in this embodiment, a full bottom-blown gas permeable element 3, the element body of which is cylindrical, is embedded in the bottom of the ladle, and the full bottom-blown gas permeable element 3 is disposed in an area with a radius of 81% and the center of the circle center of the bottom of the ladle.
As shown in fig. 4, the slits 9 in the full bottom-blowing air-permeable element 3 are arranged in a circular seam pattern through the full bottom-blowing air-permeable element 3, the width of the slits 9 being 0.05 mm.
Example 3
In this embodiment, the molten steel is refined by using the apparatus shown in FIG. 1, in this embodiment, the height of the leg 8 is 1mm, and the all-bottom-blowing gas permeable element 3 is disposed in a region of a radius of 25% with the center of the bottom of the ladle as the center.
As shown in fig. 5, the slits 9 in the full bottom-blowing air-permeable member 3 are arranged in a straight slit pattern through the full bottom-blowing air-permeable member 3, the width of the slits 9 being 0.1 mm.
Example 4
In this embodiment, the apparatus shown in fig. 1 is used for molten steel refining, in this embodiment, a full bottom-blown gas permeable element 3 is embedded in the bottom of the ladle, and the full bottom-blown gas permeable element 3 is disposed in an area with a radius of 64% and centered at the center of the circle of the bottom of the ladle.
As shown in fig. 6, the slits 9 are holes with a diameter of 0.2mm, which are uniformly arranged on the all bottom blowing ventilation element 3 and penetrate the all bottom blowing ventilation element 3.
The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, which shall fall within the scope of the present invention.
Claims (5)
1. A device for refining molten steel by using a full bottom blowing ladle comprises a ladle for refining the molten steel, and is characterized in that the ladle comprises a ladle wall and a ladle bottom, wherein the ladle wall comprises refractory material bricks, the ladle bottom is positioned below the molten steel, a full bottom blowing air permeable element is embedded in the ladle bottom, the size of the full bottom blowing air permeable element is equal to that of the ladle bottom, and a steel sleeve wraps the outside of the full bottom blowing air permeable element;
the full bottom-blowing ventilating element comprises an element body and a plurality of supporting legs, wherein the element body is cylindrical or truncated cone-shaped, the supporting legs are uniformly arranged at the bottom of the element body, and a thin air chamber is formed between the full bottom-blowing ventilating element and the bottom of a steel ladle; the bottom of the thin gas chamber is connected with an argon pipeline, and a one-way gas valve is arranged on the argon pipeline; controlling the entry of argon gas and maintaining the pressure in the thin gas chamber through the one-way gas valve;
the full bottom blowing air-permeable element is provided with at least one slit penetrating through the full bottom blowing air-permeable element, and the width of the slit is 0.05-0.5 mm;
the slit is arranged to penetrate the full bottom blowing breathable element in a mode of a broken seam, a circular seam or a straight seam.
2. The apparatus of claim 1, wherein a ramming mass is filled between the refractory brick and the full bottom-blowing permeable element.
3. The apparatus of claim 1, wherein the legs have a height of 1-50 mm.
4. The apparatus for full bottom-blowing ladle refining of molten steel according to claim 1, wherein the full bottom-blowing gas permeable member is embedded with a sliding gate nozzle unit, the sliding gate nozzle unit comprising a sliding gate nozzle brick and a sliding gate nozzle.
5. A method of using the apparatus for refining molten steel using a full bottom-blowing ladle as set forth in any one of claims 1 to 4, wherein argon gas for blowing is introduced into the full bottom-blowing gas permeable member and the interior of the ladle in sequence through the argon gas pipe, thereby stirring the molten steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910177263.2A CN109868341B (en) | 2019-03-08 | 2019-03-08 | Device and method for refining molten steel by full-bottom blowing ladle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910177263.2A CN109868341B (en) | 2019-03-08 | 2019-03-08 | Device and method for refining molten steel by full-bottom blowing ladle |
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| CN109868341A CN109868341A (en) | 2019-06-11 |
| CN109868341B true CN109868341B (en) | 2020-05-19 |
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| CN111719034A (en) * | 2019-03-21 | 2020-09-29 | 宝山钢铁股份有限公司 | Air blowing opening structure suitable for converter bottom |
| CN112024860B (en) * | 2020-09-01 | 2022-04-05 | 三鑫重工机械有限公司 | Steel ladle for steel ingot additive manufacturing printing and pouring system |
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| DE20100976U1 (en) * | 2001-01-19 | 2001-12-06 | Beck & Kaltheuner Fa | Flush for metallurgical vessels |
| CN2782703Y (en) * | 2005-03-28 | 2006-05-24 | 蓝亭 | Molten steel leakage proof device with permeation firebrick |
| CN101574730B (en) * | 2009-06-16 | 2011-11-16 | 武汉科技大学 | Method for cleaing molten steel for continuous casting tundish by air curtain retaining wall method |
| CN103555889B (en) * | 2013-10-24 | 2015-05-27 | 钢铁研究总院 | Device and method for quickly removing occluded foreign substances in molten steel |
| CN105087870B (en) * | 2015-08-31 | 2017-03-08 | 濮阳濮耐高温材料（集团）股份有限公司 | The preparation method of air blowing element, combined air blowing brick and combined air blowing brick |
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