CN108103271B - Device and method for preventing secondary oxidation of molten steel - Google Patents
Device and method for preventing secondary oxidation of molten steel Download PDFInfo
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- CN108103271B CN108103271B CN201810074596.8A CN201810074596A CN108103271B CN 108103271 B CN108103271 B CN 108103271B CN 201810074596 A CN201810074596 A CN 201810074596A CN 108103271 B CN108103271 B CN 108103271B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
A device and a method for preventing secondary oxidation of molten steel belong to the technical field of molten steel pouring equipment and methods and are used for preventing secondary oxidation of molten steel in the pouring process. The technical proposal is as follows: two layers of argon protection pipelines are arranged in a ladle long nozzle, the number of upper layer air inlet pipelines and lower layer air inlet pipelines is 6-10 respectively, the upper layer air inlet pipelines are inclined upwards by 30-40 degrees in the vertical direction, the lower layer air inlet pipelines are inclined by 30-40 degrees in the horizontal direction and the vertical direction respectively, and an upper layer air inlet and a lower layer air inlet are respectively arranged on the outer wall of the steel shell. The invention eliminates the possibility of secondary oxidation during molten steel pouring by ingenious design of double argon sealing and oblique blowing, obtains unexpected good effect, solves the problem which is not solved for a long time, and ensures the quality of molten steel pouring. The invention has simple structure and simple and convenient operation, can reduce inclusions generated by secondary oxidation, obviously reduce the probability of blocking a water gap and ensure smooth production.
Description
Technical Field
The invention relates to a device and a method for preventing molten steel from being secondarily oxidized in a casting process of molten steel, and belongs to the technical field of molten steel casting equipment and methods.
Background
With the development of production technology, the requirements of various industries on the quality of steel products are higher and higher, so that the requirements on the cleanliness of molten steel for casting billets are also continuously improved. In the production process, secondary oxidation of molten steel is an important factor affecting the cleanliness of molten steel. In the secondary oxidation of molten steel, molten steel in a ladle enters a tundish through a ladle long nozzle in the pouring process of the molten steel, and air is easily brought into the molten steel to cause secondary oxidation at the connecting part of the ladle long nozzle and a ladle drain nozzle, so that the cleanliness of the steel is reduced. In addition, new impurities can be generated by secondary oxidation, the probability of blocking a water gap is increased, and production accidents such as steel overflow and the like are caused. Therefore, the secondary oxidation of the connection part of the ladle long nozzle and the ladle drain nozzle is prevented, and the method has important significance for improving the quality of molten steel and ensuring the normal operation of production.
In order to prevent secondary oxidation of molten steel, most enterprises adopt protective casting measures. Some enterprises also adopt a hood method, namely, a box filled with argon is used for covering the steel flow and the tundish, but the device is complex, the operation difficulty is high, and the abnormal situation in the production process is difficult to treat. And the method is simpler and easier to operate than a cover method, however, the argon gas inlet direction is perpendicular to the ladle long nozzle direction, and when argon blowing is carried out for sealing, the argon gas is easy to move downwards, so that upper air is brought into molten steel to cause secondary oxidation. Therefore, the prior measures for preventing the secondary oxidation of the connection position of the ladle drain nozzle and the ladle long nozzle do not achieve the ideal effect, and become the problem of restricting the improvement of the quality of molten steel, and the problems need to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for preventing secondary oxidation of molten steel, which can enable the connection parts of a ladle bottom nozzle and a ladle long nozzle to be in an argon environment, and the molten steel is surrounded by argon in the whole pouring process, so that the secondary oxidation of the molten steel can be effectively prevented, and the quality of the molten steel is improved.
The technical scheme for solving the technical problems is as follows:
the device for preventing secondary oxidation of molten steel comprises ladle lower nozzle, steel shell, sealing bowl and ladle long nozzle, the ladle lower nozzle outer wall is connected with ladle long nozzle bowl inner wall in conical form, the sealing bowl is positioned between ladle lower nozzle outer wall and ladle long nozzle bowl inner wall, the steel shell surrounds ladle long nozzle outer wall, the improvement is that it is equipped with two layers of argon protection pipelines, upper argon protection pipeline and lower argon protection pipeline are respectively composed of upper air inlet, upper air inlet channel, upper air inlet pipeline, upper air outlet, lower air inlet channel, lower air inlet pipeline and lower air outlet, the upper air inlet channel and lower air inlet channel are respectively annular channels, the annular channels of upper air inlet channel and lower air inlet channel are respectively positioned at upper and lower parts of contact surface of ladle long nozzle outer wall and steel shell inner wall, the upper layer air inlet and the lower layer air inlet are respectively positioned on the outer wall of the steel shell, the upper layer air inlet and the lower layer air inlet are respectively connected with the annular channels of the upper layer air inlet channel and the lower layer air inlet channel, the upper layer air inlet pipeline and the lower layer air inlet pipeline are respectively a plurality of straight pipes, the plurality of upper layer air inlet pipelines and the lower layer air inlet pipeline are respectively distributed around the circumference in the ladle long water gap, the outer ends of the plurality of upper layer air inlet pipelines and the lower layer air inlet pipeline are respectively communicated with the annular channels of the upper layer air inlet channel and the lower layer air inlet channel, the plurality of upper layer air inlet pipelines and the lower layer air inlet pipeline incline upwards by 30-40 degrees in the vertical direction, the inner ends of the plurality of upper layer air inlet pipelines and the lower layer air inlet pipeline are respectively connected with a plurality of upper layer air outlets and the lower layer air outlets, the plurality of lower layer air outlets are circumferentially distributed around the joint of the ladle lower water gap of the upper end face of the sealing bowl and the inner wall of the ladle long water gap, the plurality of upper air outlets are uniformly distributed on the circumference of a gap between the outer wall of the ladle lower nozzle and the inner wall of the ladle long nozzle bowl above the lower air outlet.
According to the device for preventing secondary oxidation of molten steel, the annular bottom plate is arranged at the lower end of the sealing bowl, the inner hole diameter of the annular bottom plate is larger than that of the ladle drain outlet, and the lower end face of the ladle drain outlet is in close contact with the upper end face of the annular bottom plate at the lower end of the sealing bowl.
According to the device for preventing secondary oxidation of molten steel, the number of the upper layer air inlet pipelines and the lower layer air inlet pipelines is 6-10 respectively, the upper layer air inlet pipelines are located in the vertical direction, and the lower layer air inlet pipelines are inclined to the same side by 30-40 degrees respectively in the horizontal direction.
A method for preventing secondary oxidation of molten steel by using the device comprises the following steps:
a. two layers of argon protection pipelines are arranged in a ladle long nozzle, the number of upper layer air inlet pipelines and lower layer air inlet pipelines is 6-10 respectively, the upper layer air inlet pipelines are inclined upwards by 30-40 degrees in the vertical direction, the lower layer air inlet pipelines are inclined by 30-40 degrees in the horizontal direction and the vertical direction respectively, an upper layer air inlet and a lower layer air inlet are respectively arranged on the outer wall of a steel shell, and a matched sealing bowl and a ladle drain nozzle are prepared;
b. before pouring molten steel, a worker places a sealing bowl in a ladle long nozzle, and then places a ladle drain nozzle into the ladle long nozzle through a mechanical arm, so that the ladle drain nozzle is positioned in an inner cavity of the sealing bowl;
c. tightly pushing the outer wall of the ladle drain port against the inner wall of the sealing bowl, tightly pushing the outer wall of the sealing bowl against the inner wall of the ladle long water port, and compacting the lower end surface of the ladle drain port against the upper end surface of the annular bottom plate at the bottom of the sealing bowl;
d. after the operation is finished, opening an argon valve, and respectively introducing high-purity argon through an upper-layer air inlet and a lower-layer air inlet of an upper-layer argon protection pipeline and a lower-layer argon protection pipeline, wherein the argon flow of the upper-layer air inlet is controlled to be 50-80NL/min, and the argon flow of the lower-layer air inlet is controlled to be 20-30NL/min;
e. after argon is introduced for 20-40s, the steel ladle is lowered to the casting height by a lifter of the casting platform, and a slide plate is opened to start casting;
f. and after pouring is finished, closing the argon valve, and taking down the ladle long nozzle by using a mechanical arm.
The beneficial effects of the invention are as follows:
according to the invention, two layers of argon protection pipelines are arranged at the upper part of the sealing bowl, argon is blown into the sealing bowl from the upper position and the lower position respectively for sealing, and the air inlet pipeline is inclined upwards at a certain angle with the horizontal direction and the vertical direction respectively, so that the connection part between the ladle lower nozzle and the ladle long nozzle and the upper part of the ladle long nozzle are both in an argon environment, the blown argon flows upwards and around the connection part of the nozzle, and the upper argon flow of the connection part is obviously greater than the lower flow, therefore, even if the lower argon flows downwards, the gas brought into molten steel is the upper argon, thereby effectively preventing the secondary oxidation of the molten steel and improving the quality of the molten steel.
The invention breaks through the conventional thinking, eliminates the possibility of secondary oxidation during molten steel pouring by ingenious design of double argon sealing and oblique blowing, obtains unexpected good effect, solves the problem which is not solved for a long time, and ensures the quality of molten steel pouring.
The invention has simple structure and simple and convenient operation, not only can effectively prevent secondary oxidation of molten steel and improve the purity of the molten steel, but also can reduce inclusions generated by secondary oxidation at the connecting part of the ladle lower nozzle and the ladle long nozzle, can obviously reduce the probability of blocking the nozzle, and ensures smooth production.
Drawings
FIG. 1 is a schematic view of a device for preventing secondary oxidation of molten steel according to the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a B-B cross-sectional view of FIG. 2;
fig. 4 is a C-C cross-sectional view of fig. 3.
The figures are labeled as follows: ladle bottom nozzle 1, steel shell 2, upper inlet 3, upper inlet channel 4, upper inlet pipeline 5, upper outlet 6, lower inlet 7, lower inlet channel 8, lower inlet pipeline 9, lower outlet 10, sealing bowl 11, and ladle long nozzle 12.
Detailed Description
According to the device for preventing secondary oxidation of molten steel, the two layers of argon protection pipelines are respectively blown in argon from the upper position and the lower position for sealing, and the air inlet pipeline is respectively inclined at a certain angle with the horizontal direction and the vertical direction, so that secondary oxidation of molten steel can be effectively prevented, and the quality of molten steel is improved.
In the drawing, the outer wall of the ladle bottom nozzle 1 is in conical connection with the inner wall of the bowl part of the ladle long nozzle 12, the sealing bowl 11 is positioned between the outer wall of the ladle bottom nozzle 1 and the inner wall of the bowl part of the ladle long nozzle 12, and the steel shell 2 surrounds the outer wall of the ladle long nozzle 12.
The lower end of the sealing bowl 11 is provided with an annular bottom plate, the inner hole diameter of the annular bottom plate is larger than that of the ladle drain opening 1, and the lower end face of the ladle drain opening 1 is in close contact with the upper end face of the annular bottom plate at the lower end of the sealing bowl 11.
The lower argon protection pipeline is shown to be composed of a lower air inlet 7, a lower air inlet channel 8, a lower air inlet pipeline 9 and a lower air outlet 10. The lower layer air inlet channel 8 is an annular channel, the lower layer air inlet channel 8 is positioned at the lower part of the contact surface between the outer wall of the ladle long water gap 12 and the inner wall of the steel shell 2, the lower layer air inlet 7 is positioned on the outer wall of the steel shell 2, the lower layer air inlet 7 is connected with the annular channel of the lower layer air inlet channel 8, the lower layer air inlet pipeline 9 is a plurality of straight pipes, the lower layer air inlet pipeline 9 is uniformly distributed around the circumference in the ladle long water gap 12, the outer ends of the plurality of lower layer air inlet pipelines 9 are communicated with the annular channel of the lower layer air inlet channel 8, the inner ends of the plurality of lower layer air inlet pipelines 9 are respectively connected with a plurality of lower layer air outlets 10, and the plurality of lower layer air outlets 10 encircle the circumference at the joint of the outer wall of the ladle long water gap 1 and the bowl part of the ladle long water gap 12 on the upper end surface of the sealing bowl 11.
The upper argon protection pipeline is shown to be composed of an upper air inlet 3, an upper air inlet channel 4, an upper air inlet pipeline 5 and an upper air outlet 6. The upper layer air inlet channel 4 is an annular channel, the upper layer air inlet channel 4 is positioned at the upper part of the contact surface between the outer wall of the ladle long nozzle and the inner wall of the steel shell, the upper layer air inlet 3 is positioned on the outer wall of the steel shell 2, the upper layer air inlet 3 is connected with the annular channel of the upper layer air inlet channel 4, the upper layer air inlet pipeline 5 is a plurality of straight pipes, the upper layer air inlet pipeline 5 is uniformly distributed around the circumference in the ladle long nozzle 12, the outer ends of the plurality of upper layer air inlet pipelines 5 are communicated with the annular channel of the upper layer air inlet channel 4, the inner ends of the plurality of upper layer air inlet pipelines 5 are respectively connected with a plurality of upper layer air outlets 6, and the plurality of upper layer air outlets 6 are uniformly distributed around the circumference of a gap between the outer wall of the ladle lower nozzle 1 and the inner wall of the ladle long nozzle 12.
The number of the upper layer air inlet pipelines 5 and the lower layer air inlet pipelines 9 is 6-10 respectively, and the upper layer air inlet pipelines 5 incline upwards by 30-40 degrees in the vertical direction, so that the upper part is ensured to be in argon atmosphere; the plurality of lower air inlet pipelines 9 incline upwards by 30-40 degrees in the vertical direction, and the plurality of lower air inlet pipelines 9 incline to the same side respectively by 30-40 degrees in the horizontal direction at the same time, so that argon gas is ensured to flow upwards and around a water gap.
According to the invention, two layers of argon protection pipelines are arranged at the upper part of the sealing bowl 11, argon is blown in from the upper position and the lower position respectively for sealing, and the air inlet pipeline is inclined upwards at a certain angle with the horizontal direction and the vertical direction respectively, so that the connection part between the ladle lower nozzle 1 and the ladle long nozzle 12 and the upper part of the ladle lower nozzle are both in an argon environment, and the blown-in argon flows upwards and around the connection part of the nozzle, and the upper argon flow of the connection part is obviously greater than the lower flow, therefore, even if the lower argon flows downwards, the gas brought into molten steel is the upper argon, thereby effectively preventing the secondary oxidation of the molten steel and improving the quality of the molten steel.
The method for preventing the secondary oxidation of molten steel comprises the following steps:
a. two layers of argon protection pipelines are arranged in a ladle long nozzle 12, the number of upper layer air inlet pipelines 5 and lower layer air inlet pipelines 9 is 6-10 respectively, the upper layer air inlet pipelines 5 incline upwards by 30-40 degrees in the vertical direction, the lower layer air inlet pipelines 9 incline by 30-40 degrees in the horizontal direction and the vertical direction respectively, an upper layer air inlet 6 and a lower layer air inlet 10 are respectively arranged on the outer wall of a steel shell 2, and a matched sealing bowl 11 and a ladle lower nozzle 1 are prepared;
b. before pouring molten steel, a worker places a sealing bowl 11 in a ladle long nozzle 12, and then places a ladle drain nozzle 1 into the ladle long nozzle 12 through a mechanical arm, so that the ladle drain nozzle 1 is positioned in an inner cavity of the sealing bowl 11;
c. tightly pushing the outer wall of the ladle drain port 1 against the inner wall of the sealing bowl 11, tightly pushing the outer wall of the sealing bowl 11 against the inner wall of the ladle long water port 12, and compacting the lower end surface of the ladle drain port 1 against the upper end surface of the annular bottom plate at the bottom of the sealing bowl 11;
d. after the operation is finished, opening an argon valve, and respectively introducing high-purity argon through an upper-layer air inlet 6 and a lower-layer air inlet 10 of an upper-layer argon protection pipeline and a lower-layer argon protection pipeline, wherein the argon flow of the upper-layer air inlet 6 is controlled to be 50-80NL/min, and the argon flow of the lower-layer air inlet 10 is controlled to be 20-30NL/min;
e. after argon is introduced for 20-40s, the steel ladle is lowered to the casting height by a lifter of the casting platform, and a slide plate is opened to start casting;
f. after the pouring is completed, the argon valve is closed, and the ladle shroud 12 is taken down by a mechanical arm.
Embodiments of the invention are as follows:
example 1
The ladle drain port 1 is connected with the ladle long water port 12, the number of the upper layer air inlet pipelines 5 is 8, the upper layer air inlet pipelines 4 are uniformly and symmetrically distributed, and the upper layer air inlet pipelines 5 incline upwards by 30 degrees in the vertical direction; the number of the lower layer air inlet pipelines 9 is 8, the lower layer air inlet pipelines are uniformly and symmetrically distributed on the lower layer air inlet channels 8, and the lower layer air inlet pipelines 9 are inclined upwards by 30 degrees in the vertical direction and inclined by 30 degrees in the horizontal direction.
Before pouring molten steel, a worker places the sealing bowl 11 in the ladle long nozzle 12, then connects the ladle long nozzle 12 with the ladle drain nozzle 1 through a mechanical arm, tightly pushes the ladle drain nozzle 1 against the ladle long nozzle 12, and compacts the lower end surface of the ladle drain nozzle 1 and the upper end surface of the annular bottom plate of the sealing bowl 11. After the operation is completed, high-purity argon is introduced through the upper air inlet 3 and the lower air inlet 7. The flow rate of the upper air inlet 3 is controlled to be 80NL/min, and the flow rate of the lower air inlet 7 is controlled to be 20NL/min. After argon was introduced for 20s, casting was started. After the pouring is completed, the argon valve is closed, and the ladle shroud 12 is taken down by using the mechanical arm.
Example 2
The ladle drain port 1 is connected with the ladle long water port 12, the number of the upper layer air inlet pipelines 5 is 8, the upper layer air inlet pipelines 4 are uniformly and symmetrically distributed, and the upper layer air inlet pipelines 5 incline upwards by 40 degrees in the vertical direction; the number of the lower layer air inlet pipelines 9 is 8, the lower layer air inlet pipelines are uniformly and symmetrically distributed on the lower layer air inlet channels 8, and the lower layer air inlet pipelines 9 are inclined upwards by 40 degrees in the vertical direction and inclined by 40 degrees in the horizontal direction.
Before pouring molten steel, a worker places the sealing bowl 11 in the ladle long nozzle 12, then connects the ladle long nozzle 12 with the ladle drain nozzle 1 through a mechanical arm, tightly pushes the ladle drain nozzle 1 against the ladle long nozzle 12, and compacts the lower end surface of the ladle drain nozzle 1 and the upper end surface of the annular bottom plate of the sealing bowl 11. After the operation is completed, high-purity argon is introduced through the upper air inlet 3 and the lower air inlet 7. The flow rate of the upper air inlet 3 is controlled to be 50NL/min, and the flow rate of the lower air inlet 7 is controlled to be 30NL/min. After argon was introduced for 40s, casting was started. After the pouring is completed, the argon valve is closed, and the ladle shroud 12 is taken down by using the mechanical arm.
Example 3
The ladle drain port 1 is connected with the ladle long water port 12, the number of the upper layer air inlet pipelines 5 is 8, the upper layer air inlet pipelines 4 are uniformly and symmetrically distributed, and the upper layer air inlet pipelines 5 incline upwards by 35 degrees in the vertical direction; the number of the lower layer air inlet pipelines 9 is 8, the lower layer air inlet pipelines are uniformly and symmetrically distributed on the lower layer air inlet channels 8, and the lower layer air inlet pipelines 9 are inclined upwards by 35 degrees in the vertical direction and inclined by 30 degrees in the horizontal direction.
Before pouring molten steel, a worker places the sealing bowl 11 in the ladle long nozzle 12, then connects the ladle long nozzle 12 with the ladle drain nozzle 1 through a mechanical arm, tightly pushes the ladle drain nozzle 1 against the ladle long nozzle 12, and compacts the lower end surface of the ladle drain nozzle 1 and the upper end surface of the annular bottom plate of the sealing bowl 11. After the operation is completed, high-purity argon is introduced through the upper air inlet 3 and the lower air inlet 7. The flow rate of the upper air inlet 3 is controlled to be 60NL/min, and the flow rate of the lower air inlet 7 is controlled to be 25NL/min. After argon was introduced for 30 seconds, casting was started. After the pouring is completed, the argon valve is closed, and the ladle shroud 12 is taken down by using the mechanical arm.
Claims (3)
1. The utility model provides a prevent device of molten steel secondary oxidation, it includes ladle lower mouth of a river (1), steel shell (2), sealed bowl (11) and ladle long mouth of a river (12), ladle lower mouth of a river (1) outer wall and ladle long mouth of a river (12) bowl portion inner wall be the toper and be connected, sealed bowl (11) are located ladle lower mouth of a river (1) outer wall and ladle long mouth of a river (12) bowl portion inner wall between, and steel shell (2) encircle at ladle long mouth of a river (12) outer wall, its characterized in that: the upper argon protection pipeline and the lower argon protection pipeline are respectively composed of an upper air inlet (3), an upper air inlet channel (4), an upper air inlet pipeline (5), an upper air outlet (6), a lower air inlet (7), a lower air inlet channel (8), a lower air inlet pipeline (9) and a lower air outlet (10), wherein the upper air inlet channel (4) and the lower air inlet channel (8) are respectively annular channels, the annular channels of the upper air inlet channel (4) and the lower air inlet channel (8) are respectively positioned at the upper part and the lower part of the contact surface of the outer wall of a ladle long water gap (12) and the inner wall of a steel shell (2), the upper air inlet (3) and the lower air inlet (7) are respectively positioned on the outer wall of the steel shell (2), the upper air inlet (3) and the lower air inlet (7) are respectively connected with the annular channels of the upper air inlet channel (4) and the lower air inlet channel (8), the upper air inlet pipeline (5) and the lower air inlet pipeline (9) are respectively a plurality of straight pipes, the upper air inlet pipeline (5) and the lower air inlet pipeline (9) are respectively connected with the annular channels around the upper air inlet channel (9) and the lower air inlet channel (8) respectively, the upper air inlet pipelines (5) and the lower air inlet pipelines (9) are inclined upwards by 30-40 degrees in the vertical direction, the inner ends of the upper air inlet pipelines (5) and the lower air inlet pipelines (9) are respectively connected with the upper air outlets (6) and the lower air outlets (10), the lower air outlets (10) are circumferentially and uniformly distributed around the joint of the outer wall of the ladle drain outlet (1) and the inner wall of the ladle long water outlet (12) on the upper end surface of the sealing bowl (11), and the gaps between the outer wall of the ladle drain outlet (1) and the inner wall of the ladle long water outlet (12) above the lower air outlets (10) are circumferentially and uniformly distributed; the lower end of the sealing bowl (11) is provided with an annular bottom plate, the inner hole diameter of the annular bottom plate is larger than the inner hole diameter of the ladle drain opening (1), and the lower end surface of the ladle drain opening (1) is tightly contacted with the upper end surface of the annular bottom plate at the lower end of the sealing bowl (11); the plurality of lower air inlet pipelines (9) are respectively inclined at 30-40 degrees to the same side in the horizontal direction.
2. The apparatus for preventing secondary oxidation of molten steel according to claim 1, wherein: the number of the upper layer air inlet pipelines (5) and the lower layer air inlet pipelines (9) is 6-10 respectively.
3. A method of preventing secondary oxidation of molten steel using the apparatus of claim 1 or 2, characterized by: the method comprises the following steps:
a. two layers of argon protection pipelines are arranged in a ladle long nozzle (12), the number of upper layer air inlet pipelines (5) and lower layer air inlet pipelines (9) is 6-10 respectively, the upper layer air inlet pipelines (5) incline upwards by 30-40 degrees in the vertical direction, the lower layer air inlet pipelines (9) incline by 30-40 degrees in the horizontal direction and the vertical direction respectively, an upper layer air inlet (3) and a lower layer air inlet (7) are respectively arranged on the outer wall of a steel shell (2), and a matched sealing bowl (11) and a ladle lower nozzle (1) are prepared;
b. before pouring molten steel, a worker places a sealing bowl (11) in a ladle long nozzle (12), and then places a ladle drain nozzle (1) into the ladle long nozzle (12) through a mechanical arm, so that the ladle drain nozzle (1) is positioned in an inner cavity of the sealing bowl (11);
c. tightly pushing the outer wall of the ladle drain opening (1) against the inner wall of the sealing bowl (11), tightly pushing the outer wall of the sealing bowl (11) against the inner wall of the ladle long water opening (12), and compacting the lower end surface of the ladle drain opening (1) against the upper end surface of the annular bottom plate at the bottom of the sealing bowl (11);
d. after the operation is finished, opening an argon valve, and respectively introducing high-purity argon through an upper-layer air inlet (3) and a lower-layer air inlet (7) of an upper-layer argon protection pipeline and a lower-layer argon protection pipeline, wherein the argon flow of the upper-layer air inlet (3) is controlled to be 50-80NL/min, and the argon flow of the lower-layer air inlet (7) is controlled to be 20-30NL/min;
e. after argon is introduced for 20-40s, the steel ladle is lowered to the casting height by a lifter of the casting platform, and a slide plate is opened to start casting;
f. and after the pouring is finished, closing the argon valve, and taking down the ladle long nozzle (12) by using a mechanical arm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810074596.8A CN108103271B (en) | 2018-01-25 | 2018-01-25 | Device and method for preventing secondary oxidation of molten steel |
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| CN201810074596.8A CN108103271B (en) | 2018-01-25 | 2018-01-25 | Device and method for preventing secondary oxidation of molten steel |
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| CN108103271A CN108103271A (en) | 2018-06-01 |
| CN108103271B true CN108103271B (en) | 2023-07-25 |
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| CN108526454A (en) * | 2018-06-04 | 2018-09-14 | 河钢股份有限公司 | A kind of curved surface sealing two-way argon blowing long nozzle structure |
| CN109750136A (en) * | 2019-01-11 | 2019-05-14 | 包头钢铁（集团）有限责任公司 | A kind of method that ladle molten steel standing prevents secondary oxidation in the process |
| CN113441708A (en) * | 2021-05-26 | 2021-09-28 | 广东韶钢松山股份有限公司 | Ladle long nozzle argon sealing device and control method thereof |
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