A method for reducing aluminum loss rate in aluminum-containing steel

Abstract

This application relates to a method for reducing the aluminum loss rate in aluminum-containing steel. The main method involves adjusting the wire feeding steps in an LF refining furnace. Specifically, the side-suction dust removal system is first opened, and the opening of the baffle valve is controlled at 25-35%. The temperature sampling port is closed, and heating is stopped. The electrodes are de-energized and raised, and the three-phase electrode holes are sealed to create a micro-vacuum pressure. Then, the wire feeding hole is opened, and the wire feeding guide descends to feed the wire. Finally, the wire is withdrawn, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated. This application adds a baffle valve to the side-suction dust removal system, which can adjust the opening of the baffle valve in a timely manner according to the overflow of flue gas from the electrode ring. This maintains a state where the flue gas above the furnace cover electrode ring can overflow and be drawn back, achieving a good seal between the refining furnace cover and the ladle. This ensures a reducing atmosphere under micro-positive pressure inside the furnace, preventing aluminum oxidation. Additionally, this application adds electrode covers to the three-phase electrode holes when the three-phase electrodes are de-energized and removed from their positions, preventing large areas of molten steel from being exposed during wire feeding and drawing in too much air for oxidation.

Description

Technical Field

[0001] This application relates to the field of steelmaking technology, specifically to a method for reducing the aluminum loss rate of aluminum-containing steel. Background Technology

[0002] Aluminum-containing steel is an alloy material composed of aluminum, steel, and other elements. It possesses advantages such as high hardness, high strength, and excellent corrosion resistance, effectively resisting corrosion and reducing the oxidation reaction rate, thereby extending the material's service life. Furthermore, aluminum-containing steel exhibits excellent machinability, weldability, and extrudability, allowing for precise machining into various shapes. Therefore, it is widely used in manufacturing industries such as aerospace and automotive. Traditional aluminum-containing steel production processes include KR desulfurization, LD converter, post-furnace argon blowing, LF refining furnace, and CC continuous casting machine. However, in actual production, excessive addition of aluminum and manganese during converter tapping leads to a high aluminum burn-off rate during the smelting process. Multiple aluminum replenishments are often required during refining, which not only affects the production stability of the steel but may also lead to steel contamination, thus impacting steel quality and reducing the castability of continuously cast steel. Table 1 presents a statistical analysis of the aluminum loss rate in the molten steel at each stage of the 210t furnace aluminum steel smelting process. As can be seen from Table 1, the aluminum loss in the LF refining furnace is particularly severe, accounting for as high as 73.81%, becoming the main factor contributing to the high aluminum loss rate in the molten steel. The main reason for this is that during the LF refining process, the dust removal and exhaust capacity is too strong, and the wire feeding sealing effect is poor, leading to the oxidation of a large amount of aluminum, thus increasing aluminum consumption. In existing technologies, some researchers have attempted to reduce aluminum loss by using a high-basicity refining slag system during the VD refining process. For example, Chinese Patent No. CN107058681B discloses a method for improving the aluminum recovery rate in the VD refining process. In addition, some researchers have controlled the sum of the mass fractions of FeO and MnO in the final slag of the LF furnace to reduce the oxygen content released into the VD furnace, thereby precisely controlling the amount of aluminum blocks added. For example, Chinese Patent No. CN111321274B discloses a method for controlling aluminum in the molten steel during the refining process. However, these methods are relatively complex and all involve vacuum refining, which places high demands on equipment and personnel operation.

[0003] Therefore, how to effectively reduce the aluminum loss rate in aluminum-containing steel while simplifying the production process has become an urgent technical problem to be solved. Existing technologies urgently need improvement to address this issue.

[0004] Table 1

[0005] LF refining furnace has a high burn-out rate. 155 155 73.81 High converter burn-off rate 20 175 83.33 High burn-out rate of argon blowing station 15 190 90.48 Continuous casting protection pouring difference 15 205 97.62 Other reasons 5 210 100 total 210 210 100 Summary of the Invention

[0006] The purpose of this application is to provide a method for reducing the aluminum loss rate of aluminum-containing steel, which has the advantages of reducing aluminum oxidation loss by optimizing the wire feeding process of the LF refining furnace, thereby improving production stability and steel quality.

[0007] This application provides a method for reducing the aluminum loss rate of aluminum-containing steel, the technical solution of which is as follows:

[0008] The process route includes KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace - CC continuous casting machine. The wire feeding steps in the LF refining furnace are as follows:

[0009] Step S1. Adjust the opening of the dust collector gate valve in the dust removal system and close the temperature sampling port;

[0010] Step S2. Stop heating, disconnect the motor, and raise or move the workstation.

[0011] Step S3. Close the three-phase electrode holes after transferring the workstation;

[0012] Step S4. Open the feeding hole, and the feeding guide tube descends;

[0013] Step S5. Select the type of wire to feed and set the wire feeding speed;

[0014] Step S6. After the wire feeding is completed, the wire feeding guide rises, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated.

[0015] Furthermore, this application also proposes that the opening degree of the dust collector gate valve in S1 be controlled between 25% and 35%.

[0016] Furthermore, this application also proposes that the temperature of the molten steel in the refining furnace after heating is stopped in S2 is 1500-1600°C.

[0017] Furthermore, this application also proposes that the three-phase electrode holes in S3 are sealed with electrode hole covers, and the material of the electrode hole covers is a nickel-based alloy.

[0018] Furthermore, this application also proposes that the depth to which the wire feeding guide descends in S4 is 0.6 to 0.75 of the molten steel depth, and that the wire feeding guide is perpendicular to the molten steel surface.

[0019] Furthermore, this application also proposes that the type of wire fed in S5 is alloy wire, the diameter of the wire is 6-20 mm, the feeding speed is 1.8-2 m / min, and the feeding amount is 0.30-0.45 kg / t.

[0020] Furthermore, this application also proposes that the alloy wire is a manganese alloy or an aluminum alloy.

[0021] Furthermore, this application also proposes the following formula for calculating the aluminum element burn-off rate in S6:

[0022]

[0023] Among them, the initial value of aluminum content in molten steel is the aluminum content in molten steel after deoxidation and alloying in the converter; the final value of aluminum content in molten steel is the aluminum content in the billet of the continuous casting machine.

[0024] (1) This application adds a slide valve to the side suction dust removal system, which can adjust the opening of the slide valve in a timely manner according to the overflow of flue gas from the electrode ring, so as to keep the flue gas above the electrode ring of the furnace cover able to overflow and be drawn back, thereby achieving a good seal between the refining furnace cover and the ladle, ensuring a reducing atmosphere under slight positive pressure in the furnace, avoiding the intake of a large amount of air, and preventing the aluminum from being oxidized.

[0025] (2) When the three-phase electrodes are de-energized and leave the work station, this application adds an electrode cover to the three-phase electrode hole to prevent the molten steel from being exposed over a large area during the wire feeding process and from being oxidized by absorbing too much air.

[0026] (3) The wire feeding speed selected in this application is controlled within the range of 1.8 to 2 m / min, and the depth of the wire feeding guide is 0.6 to 0.75 of the height of the molten steel. When feeding the molten steel, it can fully contact the reaction oxidation, avoiding the problem of insufficient oxidation due to excessive speed, and excessive air contact due to excessive speed, which would also cause energy waste. Attached Figure Description

[0027] Figure 1 This is a flowchart of the wire feeding steps for the LF refining furnace in this application. Detailed Implementation

[0028] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In traditional aluminum-containing steel production processes, aluminum loss during the LF refining furnace stage is a significant problem, primarily due to excessive exhaust capacity of the dust removal system and insufficient wire feeding sealing, leading to accelerated aluminum oxidation. During this process, the molten steel is exposed to a high-oxygen environment, causing aluminum to react with oxygen to form aluminum oxide, resulting in a decrease in aluminum yield and directly affecting the stability of the steel composition and its continuous casting castability.

[0030] For example, as mentioned in the background section of this application, in the 210-ton aluminum steel smelting process, the dust removal gate valve of the LF refining furnace was not adjusted to a reasonable opening, and the temperature sampling holes and three-phase electrode holes were not completely sealed, allowing external air to enter the furnace through unsealed holes. During wire feeding, the insertion depth and verticality of the guide tube were not precisely controlled, and fluctuations in the wire feeding speed led to uneven aluminum wire distribution, further exacerbating the oxidation reaction. In this scenario, the aluminum loss rate in the molten steel increases significantly, requiring frequent aluminum replenishment to maintain the target composition, thus increasing the complexity of process control.

[0031] If the above problems are not resolved, aluminum loss will increase smelting costs, and frequent aluminum replenishment operations may introduce foreign inclusions, contaminating the cleanliness of molten steel and reducing the internal quality of continuously cast billets. At the same time, process fluctuations lead to deviations in steel composition, affecting the mechanical properties and corrosion resistance of the final product, increasing scrap rates and the difficulty of subsequent processing, and restricting the reliability of aluminum-containing steel applications in high-end manufacturing fields.

[0032] To address the aforementioned issues, this application first focuses on the critical aspects of aluminum loss during the LF refining furnace stage, conducting an in-depth analysis of the interplay between the dust removal system and the wire feeding seal. In traditional processes, fully opening the dust removal gate valve leads to excessively high negative pressure inside the furnace, accelerating external air infiltration. Simultaneously, unsealed temperature measuring holes and electrode holes during wire feeding create gas exchange channels, exacerbating aluminum oxidation. To resolve this, this application proposes balancing the furnace pressure by dynamically adjusting the opening of the dust removal gate valve, thus blocking the input path of external oxygen sources. Further investigation reveals that the insertion method of the wire feeding guide directly affects the degree of aluminum wire oxidation, requiring operational continuity through station transfer and hole sealing to prevent secondary oxidation of the molten steel. Finally, a synergistic solution is formed by integrating dust removal control, station adjustment, hole sealing, and wire feeding parameter optimization.

[0033] In response, this application proposes a method for reducing the aluminum loss rate of aluminum-containing steel. The process route includes KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace - CC continuous casting machine. The wire feeding steps in the LF refining furnace are as follows: adjust the opening of the dust removal gate valve in the dust removal system and close the temperature measurement sampling hole; stop heating, de-energize the motor and raise or transfer the station; close the three-phase electrode hole after transferring the station; open the wire feeding hole and lower the wire feeding guide; select the type of wire to be fed and set the wire feeding speed; after the wire feeding is completed, the wire feeding guide rises, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated.

[0034] The control of the dust collector gate valve opening at 25-35% refers to adjusting the opening size of the gate valve in the dust collection system to control the gas flow rate, reducing the entry of external oxygen into the refining furnace, thereby lowering the probability of aluminum contacting oxygen. Closing the temperature measurement and sampling holes means sealing the temperature measurement and sampling holes on the furnace body during wire feeding to prevent external air from entering the furnace through the holes, avoiding oxidation of aluminum at high temperatures. Stopping heating and relocating the workstation means cutting off the power supply and raising or moving the electrode position before wire feeding to prevent localized oxidation caused by high electrode temperatures, while also making space for wire feeding operations. Sealing the three-phase electrode holes with nickel-based alloy material means using a nickel-based alloy with excellent high-temperature resistance and oxidation resistance to make hole covers, sealing the electrode holes to isolate them from air and prevent aluminum oxidation in a high-temperature environment. Lowering the wire feeding guide to 0.6-0.75 times the depth of the molten steel means inserting the wire feeding guide into the molten steel to a specific depth, allowing the alloy wire to directly enter the molten steel, reducing the time aluminum is exposed to an oxidizing atmosphere on the steel surface. The wire feeding speed setting of 1.8–2 m / min refers to controlling the rate at which the alloy wire enters the molten steel, ensuring uniform dissolution of aluminum and reducing splashing or oxidation caused by excessive speed. The wire feeding amount of 0.30–0.45 kg / t refers to precisely controlling the amount of alloy wire added based on the weight of the molten steel, avoiding excessive wire feeding that could increase aluminum loss while ensuring the target aluminum content.

[0035] The core innovation of this application lies in optimizing the sealing operation and feeding parameters in the LF refining furnace wire feeding process to reduce oxygen contact and aluminum oxidation during the wire feeding stage, thereby reducing the aluminum burn-off rate. Specifically, this includes controlling the opening of the dust collector gate valve, sealing furnace body holes, using high-temperature resistant sealing materials to isolate air, and combining this with precise settings of wire feeding depth, speed, and amount to achieve efficient aluminum addition and low loss.

[0036] The working process and principle of this application are as follows: a method for reducing the aluminum loss rate in aluminum-containing steel, the process route including KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace - CC continuous casting machine. In the wire feeding step in the LF refining furnace, firstly, the opening of the dust collector gate valve in the dust removal system is adjusted, and the temperature sampling hole is closed to reduce the entry of external air into the furnace. Then, heating is stopped, the motor is de-energized and raised or moved to prepare for the wire feeding operation. After moving to the new position, the three-phase electrode holes are closed to further seal the furnace body. Next, the wire feeding hole is opened, and the wire feeding guide is lowered to the appropriate position. A suitable type of wire is selected, the wire feeding speed is set, and the wire feeding process begins. After wire feeding is completed, the wire feeding guide rises, the wire feeding hole is closed, and finally, the aluminum element burn-off rate is calculated.

[0037] This series of steps effectively reduces the chance of aluminum coming into contact with oxygen by controlling the furnace environment and optimizing the wire feeding process, thereby reducing the aluminum burn-off rate. Adjusting the opening of the dust collector gate valve and closing various orifices can reduce the entry of external air, stopping heating and transferring the workstation can avoid the impact of high temperature on aluminum, and precisely controlling the wire feeding process can ensure that aluminum is evenly distributed in the molten steel, reducing the risk of local over-oxidation.

[0038] Example 1

[0039] This embodiment provides a method for reducing the aluminum loss rate of aluminum-containing steel. The process route is KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace and CC continuous casting machine, wherein the wire feeding step in the LF refining furnace is as follows:

[0040] S1. Adjust the opening of the dust removal gate valve in the dust removal system, close the temperature sampling hole, and control the opening of the dust removal gate valve at 25%. This will ensure the reducing atmosphere in the refining furnace and reduce the amount of gas drawn in during the refining process.

[0041] S2. Stop heating, control the temperature of molten steel to 1550℃, and disconnect the motor to raise or move the workstation.

[0042] S3. After transferring to the work station, close the three-phase electrode holes. The three-phase electrode holes are sealed with electrode hole covers. During the refining process, when the three-phase electrodes are not in the inserted state, the electrode hole covers are used to make the entire furnace cover close to a sealed state, thus forming a micro-vacuum environment to isolate air and reduce the amount of air absorbed by the molten steel.

[0043] S4. Open the wire feeding hole, and the wire feeding guide descends to a depth of 0.65 times the height of the molten steel. The wire feeding guide is perpendicular to the surface of the molten steel.

[0044] S5. Select the type of wire to be fed, set the wire feeding speed, the type of wire to be fed is manganese alloy, the diameter of the wire to be fed is 15mm, the wire feeding speed is 1.9m / min, and the wire feeding amount is 0.4kg / t;

[0045] S6. After wire feeding is complete, the wire feeding guide rises, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated.

[0046] The formula for calculating the aluminum element burn-off rate is as follows:

[0047]

[0048] The initial value of aluminum content in molten steel is the aluminum content of molten steel after deoxidation and alloying in the converter.

[0049] Endpoint value of aluminum content in molten steel: aluminum content in the billet of the continuous casting machine.

[0050] Through the above-described scheme, this application can effectively reduce the aluminum loss rate in the LF refining furnace. By precisely controlling the dust removal system and sealing various pores, the chance of external air entering the furnace is reduced, thus lowering the risk of aluminum oxidation. The optimized wire feeding process ensures that aluminum is evenly distributed in the molten steel, reducing the possibility of localized over-oxidation. This method not only simplifies the production process but also improves the production stability and molten steel quality of aluminum-containing steel, reduces the number of aluminum replenishment cycles, lowers production costs, and improves the castability of continuously cast steel.

[0051] Example 2

[0052] This embodiment provides a method for reducing the aluminum loss rate of aluminum-containing steel. The process route is KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace and CC continuous casting machine, wherein the wire feeding step in the LF refining furnace is as follows:

[0053] S1. Adjust the opening of the dust removal gate valve in the dust removal system, close the temperature sampling hole, and control the opening of the dust removal gate valve at 25%. This will ensure the reducing atmosphere in the refining furnace and reduce the amount of gas drawn in during the refining process.

[0054] S2. Stop heating, control the temperature of molten steel to 1500℃, and disconnect the motor to raise or move the workstation.

[0055] S3. After transferring to the work station, close the three-phase electrode holes. The three-phase electrode holes are sealed with electrode hole covers. During the refining process, when the three-phase electrodes are not in the inserted state, the electrode hole covers are used to make the entire furnace cover close to a sealed state, thus forming a micro-vacuum environment to isolate air and reduce the amount of air absorbed by the molten steel.

[0056] S4. Open the wire feeding hole, and the wire feeding guide descends to a depth of 0.6 times the height of the molten steel. The wire feeding guide is perpendicular to the surface of the molten steel.

[0057] S5. Select the type of wire to be fed, set the wire feeding speed, the type of wire to be fed is aluminum alloy, the diameter of the wire to be fed is 6mm, the wire feeding speed is 1.8m / min, and the wire feeding amount is 0.3kg / t;

[0058] S6. After wire feeding is complete, the wire feeding guide rises, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated.

[0059] The formula for calculating the aluminum element burn-off rate is as follows:

[0060]

[0061] The initial value of aluminum content in molten steel is the aluminum content of molten steel after deoxidation and alloying in the converter.

[0062] Endpoint value of aluminum content in molten steel: aluminum content in the billet of the continuous casting machine.

[0063] Example 3

[0064] This embodiment provides a method for reducing the aluminum loss rate of aluminum-containing steel. The process route is KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace and CC continuous casting machine, wherein the wire feeding step in the LF refining furnace is as follows:

[0065] S1. Adjust the opening of the dust removal gate valve in the dust removal system, close the temperature sampling hole, and control the opening of the dust removal gate valve at 30%. This will ensure the reducing atmosphere in the refining furnace and reduce the amount of gas drawn in during the refining process.

[0066] S2. Stop heating, control the temperature of molten steel to 1500℃, and disconnect the motor to raise or move the workstation.

[0067] S3. After transferring to the work station, close the three-phase electrode holes. The three-phase electrode holes are sealed with electrode hole covers. During the refining process, when the three-phase electrodes are not in the inserted state, the electrode hole covers are used to make the entire furnace cover close to a sealed state, thus forming a micro-vacuum environment to isolate air and reduce the amount of air absorbed by the molten steel.

[0068] S4. Open the wire feeding hole, and the wire feeding guide descends to a depth of 0.7 times the height of the molten steel. The wire feeding guide is perpendicular to the surface of the molten steel.

[0069] S5. Select the type of wire to be fed, set the wire feeding speed, the type of wire to be fed is aluminum alloy, the diameter of the wire to be fed is 18mm, the wire feeding speed is 1.9m / min, and the wire feeding amount is 0.45kg / t;

[0070] S6. After wire feeding is complete, the wire feeding guide rises, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated.

[0071] The formula for calculating the aluminum element burn-off rate is as follows:

[0072]

[0073] The initial value of aluminum content in molten steel is the aluminum content of molten steel after deoxidation and alloying in the converter.

[0074] Endpoint value of aluminum content in molten steel: aluminum content in the billet of the continuous casting machine.

[0075] Example 4

[0076] This embodiment provides a method for reducing the aluminum loss rate of aluminum-containing steel. The process route is KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace and CC continuous casting machine, wherein the wire feeding step in the LF refining furnace is as follows:

[0077] S1. Adjust the opening of the dust removal gate valve in the dust removal system and close the temperature sampling hole. Control the opening of the dust removal gate valve at 35%. This will ensure the reducing atmosphere in the refining furnace and reduce the amount of gas drawn in during the refining process.

[0078] S2. Stop heating, control the temperature of molten steel to 1500℃, and disconnect the motor to raise or move the workstation.

[0079] S3. After transferring to the work station, close the three-phase electrode holes. The three-phase electrode holes are sealed with electrode hole covers. During the refining process, when the three-phase electrodes are not in the inserted state, the electrode hole covers are used to make the entire furnace cover close to a sealed state, thus forming a micro-vacuum environment to isolate air and reduce the amount of air absorbed by the molten steel.

[0080] S4. Open the wire feeding hole, and lower the wire feeding guide to a depth of 0.75 times the height of the molten steel. The wire feeding guide is perpendicular to the surface of the molten steel.

[0081] S5. Select the type of wire to be fed, set the wire feeding speed, the type of wire to be fed is manganese alloy, the diameter of the wire to be fed is 20mm, the wire feeding speed is 2m / min, and the wire feeding amount is 0.42kg / t;

[0082] S6. After wire feeding is complete, the wire feeding guide rises, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated.

[0083] The formula for calculating the aluminum element burn-off rate is as follows:

[0084]

[0085] The initial value of aluminum content in molten steel is the aluminum content of molten steel after deoxidation and alloying in the converter.

[0086] Endpoint value of aluminum content in molten steel: aluminum content in the billet of the continuous casting machine.

[0087] Comparative Example 1

[0088] The main technical difference between this comparative embodiment and Embodiment 1 is that the opening degree of the slide valve is 10%.

[0089] Comparative Example 2

[0090] The technical feature that distinguishes this comparative embodiment from Embodiment 1 is that the opening degree of the slide valve is 90%.

[0091] Comparative Example 3

[0092] The technical feature that distinguishes this comparative embodiment from Embodiment 1 is that the three-phase electrode holes are not covered.

[0093] Results Statistics

[0094] The aluminum content in the samples was tested through sampling holes at three stages: the white slag formation stage, after wire feeding, and after soft blowing. The results are shown in Table 2.

[0095] Table 2

[0096]

[0097] The aluminum loss rate of 10B22A steel production before and after the renovation was statistically analyzed from January to June 2023, and the average aluminum loss rate from January to June was calculated, as shown in Table 3.

[0098] Table 3

[0099]

[0100]

[0101] The average alloy usage of 10B22A steel before and after the renovation from January to June 2023 is shown in Table 4.

[0102] Table 4

[0103]

[0104] Results Analysis

[0105] Through Examples 1-4 and Comparative Examples 1-3, and in conjunction with Tables 2, 3, and 4, it can be seen that after the wire feeding process modification, the opening degree of the gate valve of the motor dust removal system is controlled at 25-35%, which ensures the reducing atmosphere in the refining furnace and reduces the amount of air intake during the refining process. During the refining process, when the three-phase electrodes are removed from the station, the electrode hole cover is used, which makes the entire furnace cover almost sealed, thus forming a micro-vacuum environment to isolate air and reduce the amount of air intake of molten steel, avoiding excessive air consumption of aluminum. After adjustment, the aluminum loss rate is reduced. The data of Example 3 is the best, possibly because under this condition, aluminum oxidation can be effectively avoided throughout the process. However, the aluminum loss rates of Examples 1-4 are not significantly different, which may be because the parameter range set in this application can effectively control the amount of air entering and avoid excessive aluminum consumption. Based on Examples 1-4 and Comparative Examples 1-3, and in conjunction with Tables 2, 3, and 4, it can be seen that within the parameter range set in this application, the aluminum loss rate can be well controlled to be below 40%, while the aluminum loss rate in Comparative Examples 1-3 is all above 40%. This may be because the opening of the gate valve in the dust removal system is too large or too small, and when the three-phase electrodes are moved away from the work position, the electrode hole cover is not used to isolate the air, causing air to enter and react with the aluminum to undergo an oxidation reaction, directly leading to an increase in the aluminum loss rate.

[0106] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has been disclosed above with reference to preferred embodiments, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A method for reducing aluminum loss rate in aluminum-containing steel, the process route including KR stirring desulfurization - LD converter - post-furnace argon blowing treatment - LF refining furnace - CC continuous casting machine, characterized in that, The wire feeding steps in the LF refining furnace are as follows: Step S1. Adjust the opening of the dust collector gate valve in the dust removal system to 25%-35%, and close the temperature sampling port; Step S2. Stop heating, disconnect the power to the electrodes and raise or move them to a different position; Step S3. After the electrodes are de-energized and raised or moved to a different position, close the three-phase electrode holes; Step S4. Open the feeding hole, and the feeding guide tube descends; Step S5. Select the type of wire to feed and set the wire feeding speed; Step S6. After the wire feeding is completed, the wire feeding guide rises, the wire feeding hole is closed, and the aluminum element burn-off rate is calculated.

2. The method for reducing aluminum loss rate in aluminum-containing steel according to claim 1, characterized in that, The opening degree of the dust collector gate valve mentioned in S1 is controlled between 25% and 35%.

3. The method for reducing aluminum loss rate in aluminum-containing steel according to claim 1, characterized in that, The temperature of the molten steel in the refining furnace after heating is stopped, as described in S2, is 1500–1600°C.

4. The method for reducing aluminum loss rate in aluminum-containing steel according to claim 1, characterized in that, The three-phase electrode holes described in S3 are sealed with electrode hole covers, and the electrode hole covers are made of nickel-based alloys.

5. The method for reducing aluminum loss rate in aluminum-containing steel according to claim 1, characterized in that, The depth to which the wire feeding guide descends in S4 is 0.6 to 0.75 of the molten steel depth, and the wire feeding guide is perpendicular to the molten steel surface.

6. The method for reducing aluminum loss rate in aluminum-containing steel according to claim 1, characterized in that, The type of wire fed in S5 is alloy wire, the diameter of the wire is 6-20mm, the feeding speed is 1.8-2m / min, and the feeding amount is 0.30-0.45kg / t.

7. The method for reducing aluminum loss rate in aluminum-containing steel according to claim 6, characterized in that, The alloy wire is a manganese alloy or an aluminum alloy.

8. The method for reducing aluminum loss rate in aluminum-containing steel according to claim 1, characterized in that, The formula for calculating the aluminum element burn-off rate described in S6 is as follows: Among them, the initial value of aluminum content in molten steel is the aluminum content in molten steel after deoxidation and alloying in the converter; the final value of aluminum content in molten steel is the aluminum content in the billet of the continuous casting machine.

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