CN116352066A - Method for improving cleanliness of steel ladle molten steel in steelmaking process and reducing ladle surplus - Google Patents
Method for improving cleanliness of steel ladle molten steel in steelmaking process and reducing ladle surplus Download PDFInfo
- Publication number
- CN116352066A CN116352066A CN202310349925.6A CN202310349925A CN116352066A CN 116352066 A CN116352066 A CN 116352066A CN 202310349925 A CN202310349925 A CN 202310349925A CN 116352066 A CN116352066 A CN 116352066A
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- CN
- China
- Prior art keywords
- ladle
- steel
- molten steel
- tapping
- lifting device
- 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.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 102
- 239000010959 steel Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000003749 cleanliness Effects 0.000 title claims abstract description 24
- 238000009628 steelmaking Methods 0.000 title claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 38
- 238000010079 rubber tapping Methods 0.000 claims abstract description 33
- 238000005266 casting Methods 0.000 claims abstract description 29
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 10
- 239000011819 refractory material Substances 0.000 claims description 8
- 239000011449 brick Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 abstract description 6
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000009842 primary steelmaking Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
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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
- B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable
-
- 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
- B22D41/06—Equipment for tilting
-
- 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
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
-
- 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
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
- B22D41/13—Ladle turrets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/005—Removing slag from a molten metal surface
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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
Abstract
The invention provides a method for improving the cleanliness of steel ladle molten steel in a steelmaking process and reducing ladle casting residue, belonging to the technical field of metallurgy. The method comprises the steps that during tapping, a ladle with an inclined bottom is adjusted to be in a horizontal state through a locking lifting device at the bottom of the ladle, and the ladle is adjusted to be in a horizontal state when tapping is performed in half; after tapping, the ladle is inclined towards the slag pouring direction by the locking lifting device, primary smelting slag and process deoxidizing slag brought into the ladle in the tapping process are poured out, and the pollution of the steel slag to the molten steel is reduced; in the casting process, the ladle bottom lifting device lifts the ladle to the lowest part of the ladle bottom in the later casting period, so that the casting of molten steel under the condition of not sucking the surface steel slag is ensured. According to the method, through improvement of the steel ladle, the steel ladle frame and the rotary table, the cleanliness of molten steel and the metal yield can be effectively improved, and the ladle casting surplus is reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for improving the cleanliness of steel ladle molten steel in a steelmaking process and reducing ladle casting residue.
Background
The high-quality steel is widely used for parts with high performance requirements and has high requirements on product quality. Domestic steel mills generally adopt primary smelting-refining process flow to produce high-quality steel. When casting is carried out after refining is finished, a layer of ladle slag derived from primary steelmaking furnace steel slag, slag forming materials and deoxidization products is covered above molten steel in the ladle, and the ladle slag can influence the cleanliness of the molten steel in the ladle, because the steel slag in the ladle can continuously react with the molten steel to pollute the cleaned molten steel, and the pollution degree is heavier as the steel slag quantity is larger; when the liquid level of molten steel in the ladle drops, ladle slag on the liquid level also drops, and when the liquid level of molten steel drops to a certain height, the molten steel in the ladle forms a vortex on the surface under the action of Coriolis force when the liquid level is at a certain height from a water gap at the bottom of the ladle, the steel slag at the upper part of the molten steel can be brought into a tundish along with a steel flow under the action of the vortex, the cleanliness of the molten steel is polluted, and further the quality of finished steel is reduced.
In production practice, in order to improve the above problems, a common process operation is to leave a certain weight of molten steel in a ladle during casting (i.e., a steel-leaving operation), keep ladle slag at a certain height, avoid slag-rolling phenomenon, leave molten steel with poor cleanliness near a slag-steel interface in the ladle, but this operation will produce a certain amount of ladle-leaving steel (ladle-casting), thereby reducing the metal yield of molten steel and causing an increase in production cost.
Disclosure of Invention
The invention provides a method for improving the cleanliness of steel liquid in a steel ladle in a steelmaking process and reducing ladle casting residue.
In the method, during tapping, a ladle with an inclined bottom is adjusted to be in a horizontal state in the tapping process by a locking lifting device arranged at the bottom of the ladle on a ladle frame, and the ladle state is adjusted to be horizontal when tapping is performed to half;
after tapping, the ladle is inclined towards the slag pouring direction by the locking lifting device, and primary smelting slag and process deoxidizing slag brought into the ladle in the tapping process are poured out, so that steel slag is prevented from polluting molten steel;
in the casting process, the ladle bottom lifting device on the rotary table lifts the ladle to the lowest part of the ladle bottom in the later casting period, so that the casting of molten steel under the condition of not sucking the surface steel slag is ensured.
The ladle is an inclined bottom ladle, the ladle bottom refractory material is arranged at the bottom of the ladle bottom, the lowest end of the inclined bottom is a ladle nozzle, and the ladle air brick and the inclined bottom are in the same plane.
The inclined bottom angle of the inclined bottom ladle is 5-7 degrees.
The steel ladle is located on the steel ladle frame through the steel ladle supporting device.
The steel ladle frame is provided with at least one locking lifting device corresponding to the outer edge of the steel ladle bottom, and the locking lifting device can jack up one side of the steel ladle bottom.
When tapping, the locking lifting device jacks up the bottom of the ladle by an angle of not more than 7 degrees.
And a ladle bottom lifting device is arranged on one side of the rotary table corresponding to the bottom of the ladle.
Compared with the prior art, the technical scheme has at least the following beneficial effects:
according to the scheme, through improvement of the ladle support, the rotary table and the ladle, the ladle bottom masonry treatment of the slope in the direction of the ladle wall of the ladle bottom water port is equivalent to the occupation of the residual space of molten steel by using the ladle bottom refractory material in the steel retaining operation, so that more finished molten steel is poured; during tapping, the inclined bottom ladle is adjusted to be in a horizontal state in the tapping process, so that the refractory material at the bottom of the ladle is uniformly stressed when being impacted by steel flow in the tapping process, the service life of the original ladle refractory material is maintained, after tapping is finished, the ladle is inclined towards the slag pouring direction through a ladle bottom lifting device, primary smelting slag and process deoxidizing slag brought in the ladle in the tapping process are poured out, the pollution of steel slag to molten steel in the ladle in the subsequent treatment process is reduced, and the cleanliness of the molten steel is improved; in the casting process, the molten steel in the steel ladle can be cast under the condition of not sucking the steel slag on the surface, and the metal yield of the molten steel is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a ladle structure involved in a method for improving the cleanliness of molten steel in a steel making process and reducing ladle casting residue according to the present invention;
FIG. 2 is a schematic diagram of a method for improving the cleanliness of molten steel in a steel making process and reducing the ladle surplus in the steel making process;
FIG. 3 is a schematic diagram of pouring steel slag after tapping in the method for improving the cleanliness of steel liquid in steel making process and reducing the ladle casting residue according to the invention;
FIG. 4 is a schematic view of transferring steel after tapping to a turntable in a method for improving the cleanliness of molten steel in a steel making process and reducing the ladle casting residue according to the present invention;
FIG. 5 is a schematic view of a turntable lifting ladle in a method for improving the cleanliness of molten steel in a steel making process and reducing the ladle casting residue according to the invention.
Wherein the reference numerals are as follows:
1-ladle; 2-locking the lifting device; 3-ladle supporting device; 4-a bottom-clad refractory; 5-ladle nozzle; 6-ladle frame; 7-ladle air bricks; 8-a rotary table; 9-ladle bottom lifting device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
The invention provides a method for improving the cleanliness of steel liquid in a steel ladle in a steelmaking process and reducing ladle casting residue.
In the method, during tapping, a ladle bottom slope of the inclined ladle 1 is adjusted to be in a horizontal state in the tapping process by a locking lifting device 2 arranged at the bottom of the ladle on a ladle frame 6, and the ladle 1 is adjusted to be in a horizontal state when tapping is performed to half, as shown in fig. 2;
after tapping, tilting the ladle towards the slag pouring direction by locking the lifting device 2, and pouring out primary smelting slag and process deoxidizing slag carried in the ladle in the tapping process, as shown in figure 3;
in the casting process, the ladle is lifted to the lowest part of the ladle bottom by the ladle bottom lifting device 9 on the rotary table 8 in the later casting period, so that the casting of molten steel is ensured under the condition of not sucking the surface steel slag, as shown in fig. 5.
As shown in fig. 1, a ladle 1 is an inclined bottom ladle, a ladle bottom refractory material 4 is arranged at the bottom of the ladle bottom, the lowest end of the inclined bottom is a ladle nozzle 5, and a ladle air brick 7 and the inclined bottom are in the same plane.
The ladle 1 is located on the ladle carriage 6 by the ladle supporting device 3.
The steel ladle frame 6 is provided with at least one locking lifting device 2 corresponding to the outer edge of the bottom of the steel ladle 1, and the locking lifting device 2 can jack up one side of the bottom of the steel ladle.
When tapping, the locking lifting device jacks up the bottom of the ladle by an angle of not more than 7 degrees.
As shown in fig. 4, a ladle bottom lifting device 9 is arranged on one side of the rotary table 8 corresponding to the bottom of the ladle.
In the specific application process, the preparation method comprises the following steps,
firstly, the slope ladle bottom is built in the direction of the ladle bottom water port ladle wall, which is equivalent to the occupation of the molten steel reserve space by ladle bottom refractory materials in the operation of reserving the steel, so that more finished molten steel is poured, and the metal yield is improved. However, with the increase of the ladle bottom slope angle, the coriolis force is increased due to the restriction of the ladle structure when the ladle bottom slope angle is increased to 7 degrees, so that the liquid level height of the surface vortex is increased, but the molten steel amount of the steel retaining operation is increased, the steel retaining amount is not beneficial to being reduced, and the purpose of improving the metal yield is achieved, so that the ladle bottom slope angle does not exceed 7 degrees.
Secondly, a locking lifting device is arranged at the corresponding position of the bottom of the ladle, the slope of the bottom of the ladle is adjusted to be in a horizontal state in the tapping process of the inclined-bottom ladle, and the uniform stress of the bottom refractory material when impacted by steel flow in the tapping process is ensured.
After tapping is finished, the ladle can be operated to a proper position, the ladle is inclined towards the slag pouring direction through the ladle bottom lifting device, primary smelting slag and process deoxidizing slag brought into the ladle in the tapping process are poured out, pollution of the steel slag to molten steel in the ladle in the subsequent treatment process is reduced, and the cleanliness of the molten steel is improved.
And finally, in the casting process, the ladle can be lifted to the lowest position of the ladle bottom in the later casting stage by the ladle bottom lifting device, so that molten steel in the ladle can be cast as far as possible under the condition of not sucking the surface steel slag, and the metal yield of the molten steel is improved.
The present invention is not limited to the above embodiments, but the scope of the invention is defined by the claims.
Claims (7)
1. A method for improving the cleanliness of steel ladle molten steel in the steelmaking process and reducing the ladle surplus is characterized in that,
when tapping, the ladle with the inclined bottom is adjusted to be in a horizontal state in the tapping process by a locking lifting device arranged at the bottom of the ladle on the ladle frame, and the ladle state is adjusted to be horizontal when tapping is performed to half;
after tapping, tilting the ladle towards the slag pouring direction by a locking lifting device, and pouring out primary smelting slag and process deoxidizing slag brought in the ladle in the tapping process;
in the casting process, the ladle bottom lifting device on the rotary table lifts the ladle to the lowest part of the ladle bottom in the later casting period, so that the casting of molten steel under the condition of not sucking the surface steel slag is ensured.
2. The method for improving the cleanliness of steel ladle molten steel and reducing ladle surplus in a steelmaking process according to claim 1, wherein the ladle is a sloping ladle, a ladle bottom refractory material is arranged at the bottom of the ladle bottom, the lowest end of the sloping ladle is a ladle nozzle, and the ladle air brick and the sloping ladle are in the same plane.
3. The method for improving the cleanliness of steel ladle molten steel and reducing ladle surplus in a steelmaking process according to claim 1, wherein said ladle is seated on a ladle carriage by a ladle supporting device.
4. The method for improving the cleanliness of steel ladle molten steel and reducing ladle casting residue in a steelmaking process according to claim 1, wherein at least one locking lifting device is arranged on the ladle frame corresponding to the outer edge of the bottom of the ladle, and the locking lifting device can jack up one side of the bottom of the ladle.
5. The method for improving the cleanliness of steel liquid in steel making process and reducing ladle surplus as claimed in claim 2, wherein the angle of the inclined bottom ladle is 5-7 degrees.
6. The method for improving the cleanliness of steel ladle molten steel and reducing ladle surplus according to claim 1, wherein the locking lifting device jacks up the bottom of the ladle by an angle of not more than 7 degrees during tapping.
7. The method for improving the cleanliness of steel ladle liquid in a steelmaking process and reducing ladle casting residue according to claim 1, wherein a ladle bottom lifting device is arranged on one side of the rotary table corresponding to the bottom of the ladle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310349925.6A CN116352066A (en) | 2023-04-04 | 2023-04-04 | Method for improving cleanliness of steel ladle molten steel in steelmaking process and reducing ladle surplus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310349925.6A CN116352066A (en) | 2023-04-04 | 2023-04-04 | Method for improving cleanliness of steel ladle molten steel in steelmaking process and reducing ladle surplus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116352066A true CN116352066A (en) | 2023-06-30 |
Family
ID=86920699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310349925.6A Pending CN116352066A (en) | 2023-04-04 | 2023-04-04 | Method for improving cleanliness of steel ladle molten steel in steelmaking process and reducing ladle surplus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116352066A (en) |
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2023
- 2023-04-04 CN CN202310349925.6A patent/CN116352066A/en active Pending
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