CN111957917B - Device and method for obtaining continuous casting mold flux solidified slag film - Google Patents
Device and method for obtaining continuous casting mold flux solidified slag film Download PDFInfo
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- CN111957917B CN111957917B CN202010979950.9A CN202010979950A CN111957917B CN 111957917 B CN111957917 B CN 111957917B CN 202010979950 A CN202010979950 A CN 202010979950A CN 111957917 B CN111957917 B CN 111957917B
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention provides a device and a method for obtaining a solidified slag film of continuous casting mold flux, wherein a heating element, a furnace tube and a graphite crucible are arranged in a furnace body; the bottom of the graphite crucible is provided with a base and a temperature thermocouple; the liquid protection slag is positioned in the graphite crucible; a copper probe is arranged above the graphite crucible and is connected with a probe clamping and lifting system through two brass tubes; one brass pipe is also sequentially connected with a cooling medium driving and switching device and a cooling medium storage tank through a buffer device, and the other brass pipe is connected with a cooling medium recovery or release device. When a copper probe with a cooling medium is immersed into liquid casting powder, the type and flow of the cooling medium are switched and adjusted on line in advance or in the solid slag film obtaining process, so that the purpose of obtaining the solid slag film under the conditions of different cooling rates is achieved. The obtained slag film has large cooling strength variable range, and the structure of the solid slag film is more representative and corresponds to the structure of the solid slag film in a continuous casting production field.
Description
Technical Field
The invention relates to a device and a method for obtaining a solidified slag film of continuous casting mold flux, in particular to a method and a device for obtaining a solidified slag film sample of mold flux under the conditions of different cooling rates and cooling time.
Background
The protective slag of the continuous casting crystallizer is an indispensable important auxiliary material in the continuous casting of ferrous metallurgy, and plays important roles of controlling heat transfer of a primary blank shell to the crystallizer, preserving heat of a molten steel surface, isolating air, lubricating the primary blank shell, absorbing floating impurities of the molten steel and the like in the continuous casting process.
In the continuous casting process, after the casting powder is added into the crystallizer and heated and melted, a liquid slag pool with stable depth is formed on the liquid level of the steel, and the liquid slag in the slag pool flows into a gap between the copper wall and the blank shell of the crystallizer under the vibration action of the crystallizer. The liquid slag close to one side of the water-cooled copper wall of the crystallizer is gradually solidified to form a solid slag film, the liquid slag close to one side of the primary blank shell forms a liquid slag film due to higher temperature, and the solid slag film and the liquid slag film respectively play very important metallurgical roles of controlling heat transfer from the blank shell to the crystallizer, lubricating the blank shell and the like.
Since the properties of the slag film are determined by its structure, the research on the solidification structure of the slag film has become an important point in the research on the continuous casting mold flux. The structure of the solidified slag film is influenced by the solidification conditions, particularly the cooling rate, in addition to the composition of the mold flux. In the actual continuous casting process, the solidification condition of the slag film is extremely complex, and the influence factors are numerous. Therefore, how to simulate the solidification conditions of the protective slag film on the industrial site is to obtain a solidified slag film similar to the structure of the production site in a laboratory, and the representative solidified slag film is particularly important.
In order to analyze the heat transfer performance of the slag film under different conditions, stable parameters such as the thickness, the surface roughness and the internal structure quantitative characteristics of the corresponding slag film need to be acquired. The flat plate method used in the prior document has complex equipment, the cooling rate is difficult to effectively control, and the scale application is not available. The Cold finger (Cold finger) method is easy to cause the liquid slag in a high-temperature furnace in a laboratory to be overcooled due to the excessive cooling intensity of the probe, so that the structure of the obtained solidified slag film is uneven and lacks representativeness, and even though the probe is improved and reduced in size, the situation that the liquid slag flowing into the vicinity of a meniscus is cooled slowly in the stable continuous casting process is difficult to simulate.
Disclosure of Invention
The invention aims to provide a device and a method for obtaining a continuous casting mold flux solidified slag film. The method can obtain the solidified slag films at different cooling rates, and has the advantages of large on-line switching adjustable range of the total cooling rate, stable structure of the obtained solidified slag films and strong representativeness.
The technical scheme of the invention is as follows:
the device for obtaining the solidified slag film of the continuous casting mold flux comprises a furnace body, wherein a heating element, a furnace tube and a graphite crucible are sequentially arranged in the furnace body from outside to inside; the bottom of the graphite crucible is provided with a base and a temperature thermocouple; the liquid covering slag is positioned in the graphite crucible;
a copper probe is arranged above the graphite crucible and is connected with a probe clamping and lifting system through two brass tubes; one brass pipe is also sequentially connected with a cooling medium driving and switching device and a cooling medium storage tank through a buffer device, and the other brass pipe is connected with a cooling medium recovery or release device;
the temperature thermocouple, the heating element and the probe clamping and lifting system are respectively connected with a computer display and control cabinet.
The method for obtaining the solidified slag film of the continuous casting mold flux adopts the device, and achieves the purpose of obtaining the solidified slag film under the conditions of different cooling rates by switching and adjusting the type and the flow of the cooling medium on line in advance or in the process of obtaining the solidified slag film when a copper probe introduced with the cooling medium is immersed into the liquid mold flux.
Further, the cooling medium passing through the copper probe comprises one of the following: water, brine, argon, nitrogen and quenching oil.
When the copper probe introduced with the cooling medium is immersed into the liquid mold flux to obtain a solidified slag film, the temperature of the liquid mold flux is constant, and the temperature control range is 1200-1450 ℃.
In the solid slag film obtaining process, the total time range of the copper probe introduced with the cooling medium to be immersed into the liquid mold flux is 5-300 s.
In the solid slag film obtaining process, the temperature of the cooling medium is not more than 200 ℃ when the cooling medium passes through the outlet of the copper probe.
The invention has the beneficial effects that:
the invention can lead the total cooling intensity to be changeable and adjustable on line when the copper probe is immersed into the liquid slag to obtain the slag film by switching and adjusting the type or the flow of the cooling medium introduced into the copper probe in advance or on line. The method and the device can obtain the solidified slag film of the casting powder under different cooling conditions, and the cooling strength of the slag film has a large variable range, so that the structure of the solid slag film obtained in a laboratory is more representative and corresponds to the structure of the solidified slag film in a continuous casting production field.
The mechanism of obtaining the solid slag film with a representative structure by switching the types and the flow of the cooling medium passing through the copper probe in advance or on line is as follows:
1) the continuous casting covering slag is a silicate slag system with oxide components as main components, the microstructure of the continuous casting covering slag in a molten state is complex, and the high-temperature physical and chemical properties of the continuous casting covering slag are greatly influenced by temperature change. Therefore, the dynamic conditions in the slag solidification process are obviously influenced by the cooling rate, and the phenomenon that the microstructure of a solidified slag film changes greatly after the cooling rate changes is caused.
2) In the actual continuous casting process, after the liquid mold flux flows into the gap between the crystallizer wall and the blank shell, the cooling rates of the liquid mold flux are very different at different positions and different stages of continuous casting, so that the structure of a solid slag film in the actual continuous casting crystallizer is variable and complicated. Because the important function of controlling heat transfer of the solid slag film is directly determined by the microstructure of the solid slag film, when the solidified slag film is obtained in a laboratory, the control range of the cooling rate needs to be consistent with the actual continuous casting process, otherwise, the obtained structural parameters of the slag film and the heat transfer characteristics of the slag film deviate from the actual process.
3) When a laboratory obtains a solid slag film, in the traditional method, a copper probe is immersed into liquid mold powder to obtain a condensed slag film, only water is used as a cooling medium, the cooling medium is single, the initial cooling rate is high, and the adjustable range of the cooling rate is narrow. This may not be consistent with the solidification growth of the slag film near the meniscus after the continuous casting process has stabilized. Therefore, the invention simulates the cooling state of the slag film in the continuous casting process by switching the types and the input amount of the cooling medium in advance or on line.
4) Compared with the traditional water-cooling copper probe method with a single cooling medium, the invention describes a method for simulating the cooling state of a slag film in the continuous casting process by switching the type and the introduction amount of the cooling medium in advance or on line. The method has a large adjustable range of cooling rate, and the obtained slag film has good structural correspondence with the slag film collected on the continuous casting production field.
5) The method can obtain the covering slag solidified slag film under different cooling conditions, and can calculate the heat flux density passing through the solidified slag film under different cooling conditions through the contact area of the slag film and the copper wall, the flow rate of different cooling media and the temperature difference of media entering and exiting the copper probe. By the same principle, the method and the device can also obtain the solidification characteristics of other high-temperature slag systems and the heat transfer characteristics of solid slag.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
As shown in fig. 1, the device for obtaining the solidified slag film of the continuous casting mold flux comprises a furnace body 1, wherein a heating element 3, a furnace tube 7 and a graphite crucible 8 are sequentially arranged in the furnace body 1 from outside to inside; the bottom of the graphite crucible 8 is provided with a base 5 and a temperature thermocouple 6; the liquid mold flux 4 is positioned in the graphite crucible 8;
a copper probe 2 is arranged above the graphite crucible 8, and the copper probe 2 is connected with a probe clamping and lifting system 10 through two brass tubes 9; one brass tube 9 is also sequentially connected with a cooling medium driving and switching device 12 and a cooling medium storage tank 13 through a buffer device 11, and the other brass tube 9 is connected with a cooling medium recovery or release device 14;
the temperature thermocouple 6, the heating element 3 and the probe clamping lifting system 10 are respectively connected with a computer display and control cabinet 15.
The copper probe 2 is a cuboid probe with large copper width-thickness ratio and communicated with a cooling medium, the copper probe 2 is connected with a brass tube 9 for the cooling medium to enter and exit, the brass tube 9 is connected to a buffer device 11 and a cooling medium driving and switching device 12 through a heat-resistant hose, the cooling medium driving and switching device 12 is connected to different cooling medium sources, and the brass tube 9 is clamped in a probe clamping and lifting system 10; a temperature thermocouple is arranged in the brass tube 9, and a temperature measuring point is positioned at the junction of the copper probe 2 and the brass tube 9. The high-temperature furnace system consists of a furnace body 1 and a computer display and control cabinet 15, wherein a heating element 3, a furnace tube 7, a graphite crucible 8, a base 5 and a temperature thermocouple 6 are arranged in the furnace body 1. The liquid mold flux 4 sample is placed in a graphite crucible 8, the graphite crucible 8 is placed on a base 5, the copper probe 2 which is introduced with the cooling medium is immersed into the molten liquid mold flux 4, the mold flux is attached to the copper probe 2 for solidification and growth, and the copper probe 2 is lifted out to strip the slag sample, so that the solid slag film can be obtained.
Example 1: a method for obtaining a solidified slag film of continuous casting mold flux is characterized in that a copper probe 2 is a hollow probe, and different cooling conditions of liquid slag are simulated by switching the type and the introduction amount of a cooling medium introduced into the probe in advance or on line, so that the solidified slag film in different states is obtained.
The slag film obtaining experiment is to detect when the temperature of liquid slag is constant at 1350 ℃.
In the slag film obtaining experiment, quenching oil is initially introduced as a cooling medium, argon gas is introduced after the quenching oil is immersed in liquid slag for 10 seconds, and a water-cooling probe is lifted and peeled off to obtain a solid slag film after the argon gas is introduced and the cooling medium is switched to the argon gas for 35 seconds.
During the slag film obtaining experiment, the flow rates of the introduced quenching oil and the introduced argon are respectively 1.5L/min and 8L/min.
Table 1 shows the composition of mold flux in obtaining the solidified slag film in this example. Meanwhile, the covering slag with the components is cast on site to produce a typical sub-peritectic steel slab. After the continuous casting is stable, the structure near the lower part of the slag ring picked out from the meniscus is the same as the microstructure characteristic of the solid slag film obtained by the method and the device. The field trial result of the covering slag is consistent with the conclusion obtained by the experimental evaluation method disclosed by the patent.
TABLE 1 typical chemical composition of the mold flux measured in example of continuous casting
| Formulation of | SiO2 | CaO | Al2O3+MgO | Fe2O3 | F- | R2O |
| 1# | 30 | 41 | 8 | 0.3 | 8 | 6.5 |
Note: r2O is an alkali metal oxide
Example 2: a method for obtaining a solidified slag film of continuous casting mold flux is characterized in that a copper probe 2 is a hollow probe, and different cooling conditions of liquid slag are simulated by switching the type and the introduction amount of a cooling medium introduced into the probe in advance or on line, so that the solidified slag film in different states is obtained.
The slag film obtaining experiment is to detect when the temperature of liquid slag is constant at 1350 ℃.
During the slag film obtaining experiment, argon is introduced as a cooling medium, other cooling media are not switched in the whole process, after the slag liquid is immersed for 50s, the water-cooling probe is lifted, the cooling medium is rapidly switched to quenching oil, and then the solid slag film is obtained by stripping.
During the real-time detection, the flow rates of the introduced argon and the quenching oil are respectively 15L/min and 2L/min.
Also, Table 1 shows the composition of mold flux in obtaining the solidified slag film in this example. When the covering slag is used for casting peritectic steel plate blanks, after continuous casting is stable, the structure of the upper part of the slag ring picked out from the meniscus and close to the liquid slag layer is compared with the solid slag film obtained by the method and the device, and the microstructure characteristics are the same. The field trial result of the covering slag is consistent with the conclusion obtained by the experimental evaluation method disclosed by the patent.
The above description is only for the purpose of illustrating the present invention and the appended claims, and the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (6)
1. The device for obtaining the solidified slag film of the continuous casting mold flux is characterized in that: comprises a furnace body, wherein a heating element, a furnace tube and a graphite crucible are sequentially arranged in the furnace body from outside to inside; the bottom of the graphite crucible is provided with a base and a temperature thermocouple; the liquid protection slag is positioned in the graphite crucible;
a copper probe is arranged above the graphite crucible and is connected with a probe clamping and lifting system through two brass tubes; one brass pipe is also sequentially connected with a cooling medium driving and switching device and a cooling medium storage tank through a buffer device, and the other brass pipe is connected with a cooling medium recovery or release device;
the temperature thermocouple, the heating element and the probe clamping and lifting system are respectively connected with a computer display and control cabinet;
the copper probe is a cuboid probe which is communicated with a cooling medium and is made of copper with a large width-thickness ratio, the copper probe is connected with a brass pipe for the cooling medium to enter and exit, the brass pipe is connected with a buffer device and a cooling medium driving and switching device through a heat-resistant hose, the cooling medium driving and switching device is connected to different cooling medium sources, and the brass pipe is clamped in a probe clamping lifting system; a temperature thermocouple is arranged in the brass tube, and a temperature measuring point is positioned at the junction of the copper probe and the brass tube; the high temperature furnace system consists of a furnace body and a computer display and control cabinet, wherein a heating element, a furnace tube, a graphite crucible, a base and a temperature thermocouple are arranged in the furnace body.
2. The method for obtaining the solidified slag film of the continuous casting mold flux is characterized by comprising the following steps: the device of claim 1 is adopted, and when a copper probe with a cooling medium is immersed in liquid mold flux, the purpose of obtaining the solid slag film under the condition of different cooling rates is achieved by switching and adjusting the type and flow of the cooling medium on line in advance or in the solid slag film obtaining process.
3. The method for obtaining the solidified slag film of the continuous casting mold flux according to claim 2, characterized in that: the cooling medium passing through the copper probe comprises one of the following: water, brine, argon, nitrogen and quenching oil.
4. The method for obtaining the solidified slag film of the continuous casting mold flux according to claim 2, characterized in that: when the copper probe introduced with the cooling medium is immersed into the liquid mold flux to obtain a solidified slag film, the temperature of the liquid mold flux is constant, and the temperature control range is 1200-1450 ℃.
5. The method for obtaining the solidified slag film of the continuous casting mold flux according to claim 2, characterized in that: in the solid slag film obtaining process, the total time range of the copper probe introduced with the cooling medium to be immersed into the liquid mold flux is 5-300 s.
6. The method for obtaining the solidified slag film of the continuous casting mold flux according to claim 2, characterized in that: in the solid slag film obtaining process, the temperature of the cooling medium is not more than 200 ℃ when the cooling medium passes through the outlet of the copper probe.
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| CN100495006C (en) * | 2006-09-29 | 2009-06-03 | 重庆大学 | Internal slag heat current inspector and inspection method for continuously-casting crystallizer |
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| CN105092406A (en) * | 2015-07-07 | 2015-11-25 | 中南大学 | Novel furnace slag crystallization process thermogravimetric test device and test method |
| CN105880501B (en) * | 2016-06-03 | 2018-02-23 | 中南大学 | A kind of method of covering slag and crystallizer interface resistance in measurement continuous cast mold |
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