Pressurized feeding device and method for improving aluminum content control precision of oriented silicon steel

Abstract

The invention provides a pressurized feeding device and method for improving the aluminum content control precision of oriented silicon steel. The pressurized feeding device comprises a material storage part, a feeding part, a feeding part and a feeding part, wherein the material storage part is provided with a material storage space; the pressurizing sealing piece is detachably connected with the material storage part and is used for sealing and pressurizing the material storage part; and the material conveying part is provided with a far end and a near end in the extending direction of the material conveying part, and the near end is connected with the material storage part so as to receive the materials in the material storage part and convey the materials to the position below the liquid level of molten steel in the steel ladle through the far end. Wherein the material storage part is used for storing materials such as metal aluminum blocks, in the working state, the material storage part is sealed and pressurized through the pressurization sealing piece, the materials are completely added into molten steel through the material conveying part by means of the air pressure difference, the operation of adding the aluminum blocks can be executed in a small amount and multiple times, the control precision of the aluminum content is improved, and the production efficiency is improved. And meanwhile, secondary oxidation of the aluminum blocks is reduced, the yield of the aluminum blocks is increased, and the defect that the aluminum blocks cannot be effectively utilized is overcome.

Description

Technical Field

[0001] The present application relates to the field of steel production, and in particular to a pressurized feeding device and method for improving the control accuracy of aluminum content in oriented silicon steel. Background Art

[0002] Oriented silicon steel is an important soft magnetic material, mainly used to manufacture transformer cores. Oriented silicon steel has extremely strict requirements on chemical composition and a very narrow range of specified composition. A slight fluctuation in composition has a great impact on product performance, especially for low-temperature high-magnetic induction oriented silicon steel with AlN as the main inhibitor. The acid-soluble aluminum (Als) is specified to be 0.02% to 0.03%, and nitrogen is 0.006% to 0.01%. Acid-soluble aluminum = total aluminum content - aluminum content in Al2O3. The acid-soluble aluminum content has the most obvious effect on magnetism.

[0003] At present, there are few patents related to the precise control of Als content in oriented silicon steel. In existing industrial production, the increase in converter volume also increases the difficulty of precise control of alloying elements. Summary of the invention

[0004] The embodiments of the present application provide a pressurized feeding device and method for improving the control accuracy of the aluminum content of oriented silicon steel, aiming at improving the control accuracy of Als during the production process.

[0005] In the first aspect, an embodiment of the present application provides a pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel, comprising: a storage portion, the storage portion having a storage space, the storage space being used to store materials; a pressurized seal, the pressurized seal being detachably connected to the storage portion, the pressurized seal being used to seal and pressurize the storage portion; and a feeding portion, the feeding portion having a distal end and a proximal end in its own extension direction, the proximal end being connected to the storage portion to receive the material in the storage portion and transport it to below the liquid level of molten steel in the ladle through the distal end.

[0006] According to an embodiment of the first aspect of the present application, the material storage portion has a conical structure.

[0007] According to an embodiment of the first aspect of the present application, in the working state, the distal end is higher than the proximal end so that the feeding part is arranged inclined.

[0008] According to an embodiment of the first aspect of the present application, a control member is provided between the material storage portion and the material delivery portion to control the material in the material storage portion to enter the material delivery portion.

[0009] According to an embodiment of the first aspect of the present application, the device further includes a moving component, which is used to enable the pressurized feeding device for improving the control accuracy of the aluminum content of the oriented silicon steel to achieve a moving function.

[0010] In a second aspect, the present application provides a method for improving the control accuracy of aluminum content in oriented silicon steel, comprising: detecting the actual acid-soluble aluminum content of molten steel in a ladle, and determining the required metal aluminum content based on the theoretical acid-soluble aluminum content and the actual acid-soluble aluminum content; weighing metallic aluminum with the required metal aluminum content, and placing the metallic aluminum in the above-mentioned pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel; starting the pressurized feeding device to allow the metallic aluminum to be added below the liquid surface of the molten steel through the air pressure difference.

[0011] According to the embodiment of the second aspect of the present application, an alkaline covering agent is used in the tundish to reduce the mutual replacement of silicon with aluminum in the molten steel; 80-200 kg of alkaline covering agent is added when changing ladles during continuous casting to reduce the increase in covering agent gaps caused by fluctuations in the liquid level in the tundish and to reduce secondary oxidation caused by contact between the molten steel and the air.

[0012] According to an embodiment of the second aspect of the present application, argon sealing is performed at the water inlet connection between the ladle and the middle ladle, wherein the argon flow rate is between 1-10L / min and the argon pressure is between 0-2Mpa to avoid air inhalation due to pressure difference.

[0013] Compared with the prior art, this application has at least the following beneficial effects:

[0014] The pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel in the embodiment of the present application includes a storage part, a pressurized seal and a feeding part. Among them, the storage part has a storage space for storing materials such as metal aluminum blocks, and the distal end of the feeding part extends below the liquid level of molten steel in the ladle. In the working state, the storage part is sealed and pressurized by the pressurized seal, so that a pressure difference is formed between the storage part and the space below the liquid level of the molten steel. The material such as metal aluminum blocks is completely added to the molten steel through the feeding part by using the pressure difference, and the operation of adding aluminum blocks in small quantities and multiple times can be realized, thereby improving the control accuracy of the aluminum content, reducing the secondary oxidation of aluminum blocks, improving the recovery rate of aluminum blocks, and improving the disadvantage that when the aluminum blocks are manually thrown by hand, the aluminum blocks float on the surface of the slag liquid due to their low density, and then quickly oxidize into Al2O3 under high temperature conditions, resulting in the ineffective utilization of the aluminum blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly described below; obviously, the drawings described below only involve some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the pressurized feeding device in the embodiment of the present application.

[0017] Figure 2 This is a schematic diagram of the application of the device according to an embodiment of the present application.

[0018] Reference numerals:

[0019] 10, material storage part; 11, material storage space;

[0020] 20, pressurized seal;

[0021] 30, feeding part; 31, proximal end; 32, distal end;

[0022] 40, control parts;

[0023] 50, mobile components. DETAILED DESCRIPTION

[0024] In order to make the application purpose, technical solution and beneficial technical effect of the present application clearer, the present application is further described in detail in conjunction with the embodiments below. It should be understood that the embodiments described in this specification are only for explaining the present application, not for limiting the present application.

[0025] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range, and any upper limit can be combined with any other upper limit to form an unambiguous range. In addition, although not explicitly stated, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range.

[0026] In the description of this article, it should be noted that, unless otherwise specified, “above” and “below” are inclusive of the number itself, and the “multiple” in “one or more” means more than two.

[0027] The above application content of the present application is not intended to describe each disclosed embodiment or each implementation in the present application. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided by a series of examples, which can be used in various combinations. In each example, enumeration is only used as a representative group and should not be interpreted as exhaustive.

[0028] The influence of acid-soluble aluminum content on magnetism is the most obvious. It is recorded in the literature related to electrical steel that the appropriate Als in Hi-B steel is 0.02%~0.03%, the appropriate N2 is 0.006%~0.009%, 0.35mm thick plate is 0.01~0.012mm, =8~10mm, P15 is 0.97~1.0W / kg, B8 is 1.92~1.95T. If the Als content is too high, the quality of the glass film will deteriorate. When N2>0.01%, the casting is prone to swelling, and the product will have peeling and blistering (Blister) defects. If the Als and nitrogen content is too low, the amount of fine AlN precipitated after normalization is insufficient, and the secondary recrystallization is incomplete. The cooling rate after normalization (the starting temperature of quenching) is determined in the subsequent process based on the Als and nitrogen content. From the above, we can see that no matter which type is used, the Als content requirement is extremely high and is controlled at the ppm level. A slight deviation will cause the entire furnace of products to be scrapped. The control of Als has become a major difficulty for steel mills to produce oriented silicon steel.

[0029] The inventors of the present application have noticed that there are relatively few methods for accurately controlling the Als content in oriented silicon steel, and in existing industrial production, the increase in converter volume has also increased the difficulty of accurately controlling alloying elements.

[0030] Based on this, the inventors have conducted a lot of research and provided a pressurized feeding device and method for improving the control accuracy of the aluminum content of oriented silicon steel, which is used to produce oriented silicon steel with excellent performance.

[0031] Pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel

[0032] In a first aspect, the embodiments of the present application provide a pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel. Figure 1 This is a schematic diagram of the structure of the pressurized feeding device in the embodiment of the present application, please refer to Figure 1 The pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel includes:

[0033] A material storage portion 10, wherein the material storage portion 10 has a material storage space 11, and the material storage space 11 is used to store materials;

[0034] A pressurizing seal 20, which is detachably connected to the material storage portion 10, and is used to seal and pressurize the material storage portion 10;

[0035] And a feeding part 30, the feeding part 30 has a distal end 32 and a proximal end 31 in its own extension direction, and the proximal end 31 is connected to the storage part 10 to receive the material in the storage part 10 and transport it to below the liquid level of the molten steel in the ladle through the distal end 32.

[0036] The pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel in the embodiment of the present application is a pressurized charging device for charging into a ladle by pressurization. The pressurized charging device of the present application includes a storage part 10, a pressurized sealing member 20 and a feeding part 30. Among them, the storage part 10 has a storage space 11 for storing materials such as metal aluminum blocks, and the distal end 32 of the feeding part 30 extends below the liquid level of the molten steel in the ladle. In the working state, the pressurized seal 20 is used to seal and pressurize the storage part 10, so that a pressure difference is formed between the storage part 10 and the space below the liquid level of the molten steel. The pressure difference is used to completely add materials such as metal aluminum blocks into the molten steel through the feeding part 30, so that the operation of adding aluminum blocks in small quantities and multiple times can be realized, thereby improving the control accuracy of the aluminum content, reducing the secondary oxidation of the aluminum blocks, improving the recovery rate of the aluminum blocks, and improving the disadvantage that when the aluminum blocks are manually thrown by hand, the aluminum blocks float on the surface of the slag liquid due to their low density, and are quickly oxidized into Al2O3 under high temperature conditions and cannot be effectively utilized.

[0037] It should be noted that the pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel in the embodiment of the present application can be used not only to fill aluminum into the ladle, but also to fill other materials, such as adding alloys when fine-tuning the composition.

[0038] The material of the material storage part 10 is not particularly limited in the embodiment of the present application, as long as it has a certain strength, it can be a metal material or a polymer material, for example, the material of the material storage part 10 is high-strength polyethylene. Preferably, the material of the material storage part 10 is metal.

[0039] In the embodiment of the present application, the material of the feeding part 30 can be various, such as a single metal or alloy. Since the feeding part 30 needs to be inserted below the liquid level of the molten steel, the material of the feeding part 30 is preferably a metal with a high melting point, such as iron.

[0040] In the embodiment of the present application, the material storage portion 10 and the pressurized seal 20 can be connected in one piece. For example, the pressurized seal 20 includes an opening portion, and the opening portion is used to allow the material to pass through when filling the material. The pressurized seal 20 also includes a sealing cover, and the sealing cover is used to seal the opening after the material filling is completed.

[0041] In the embodiment of the present application, the material storage portion 10 and the pressurized seal 20 may also be detachably connected. For example, when the material needs to be filled, the entire pressurized seal 20 is removed. After the material is filled into the material storage portion 10, the pressurized seal 20 and the material storage portion 10 are assembled and sealed.

[0042] The pressurizing seal 20 in the embodiment of the present application needs to form a sealing structure with the material storage part 10 on the one hand, and on the other hand, it needs to be able to pressurize the material storage part 10. The pressurizing seal 20 can adopt a device capable of pressurizing in the prior art, and for example, the pressurizing seal 20 can include a pressurizing valve. For example, an external pressurizing valve or an external booster pump can be connected.

[0043] Please also read Figure 1 and Figure 2 The feeding part 30 has a tubular structure, and the tubular structure has a distal end 32 and a proximal end 31 in its own extension direction. One side of the proximal end 31 is connected to the storage part 10. In the working state, one side of the distal end 32 extends below the liquid level of the molten steel in the ladle. When charging the ladle, the proximal end 31 of the feeding part 30 is connected with the storage part 10, and the material enters the feeding part 30 from the storage part 10 through the proximal end 31. After being transported by the feeding part 30, it enters below the liquid level of the molten steel in the ladle through the distal end 32. The operation of adding aluminum blocks in small quantities and multiple times can be realized, thereby improving the control accuracy of the aluminum content, thereby reducing the secondary oxidation of materials such as aluminum blocks, improving the utilization efficiency of materials, and improving the control accuracy of the aluminum content.

[0044] According to the embodiment of the first aspect of the present application, the material storage portion 10 has a conical structure.

[0045] Please continue reading Figure 1 and Figure 2 The conical structure in the embodiment of the present application refers to that the cross-sectional area of ​​the material storage part 10 in the direction perpendicular to its own extension gradually changes. Specifically, the material storage part 10 has a shape that is wide at the top and narrow at the bottom. The material storage part 10 is designed as a conical structure, which is conducive to the smooth falling of materials such as metal aluminum blocks. The conical structure in the present application can be a conical structure or a pyramid structure, wherein the pyramid can be a regular pyramid or a non-regular pyramid.

[0046] According to the embodiment of the first aspect of the present application, in the working state, the distal end 32 is higher than the proximal end 31 in the vertical direction, so that the feeding part 30 is arranged tilted.

[0047] In the embodiment of the present application, the distal end 32 is close to the feeding part 30 in its own extension direction, and is higher than the proximal end 31 in the vertical direction, so that the feeding part 30 is tilted, which facilitates the insertion of the distal end 32 of the feeding part 30 below the liquid level of the ladle. At the same time, the feeding part 30 is in a tilted state, which can allow materials such as metal aluminum blocks to slide smoothly into the ladle.

[0048] In the embodiment of the present application, the feeding portion 30 with a tubular structure can be a straight tube or a curved tube with a certain curvature. When the feeding portion 30 is a curved tube, the lower wall in the vertical direction can be bent upward or downward, and the present application does not make any special limitation on this.

[0049] When the feeding part 30 is in a straight tube shape and in an inclined state, materials such as metal aluminum blocks can slide into the ladle more smoothly.

[0050] When the feeding part 30 is in a curved pipe shape and in an inclined state, materials such as metal aluminum blocks can slide into the ladle with the help of air pressure difference.

[0051] In some embodiments, in the working state, the distal end 32 and the proximal end 31 may also be located at the same height in the vertical direction, so that materials such as metal aluminum blocks can slide into the ladle with the help of air pressure difference. The embodiments of the present application are not limited to this.

[0052] According to an embodiment of the first aspect of the present application, a control component 40 is provided between the material storage portion 10 and the material delivery portion 30 to control the material in the material storage portion 10 to enter the material delivery portion 30 .

[0053] The control member 40 is used to control the release of materials such as metal aluminum blocks in the material storage part 10. When the control member 40 is in a closed state, the material storage part 10 can be in a sealed state, which is convenient for quickly pressurizing the material storage part 10 to form an air pressure difference. At this time, the material in the material storage part 10 cannot enter the feeding part 30. When the control member 40 is in an open state, the material enters the feeding part 30 through the proximal end 31 and is transported in the feeding part 30, and finally enters the ladle from the distal end 32 extending below the ladle liquid level. Exemplarily, the control member 40 is a valve bolt. The control member 40 can be controlled manually or by a program.

[0054] According to an embodiment of the first aspect of the present application, the device further comprises a moving component 50, and the moving component 50 is used to enable the pressurized feeding device for improving the control accuracy of the aluminum content of the oriented silicon steel to realize the moving function.

[0055] The mobile assembly 50 can enable the pressurized feeding device to realize the mobile function. When feeding is needed, the pressurized feeding device can be moved over for use, and the pressurized feeding device can be moved away after the feeding is completed. The present application does not limit the installation position of the mobile assembly 50, and the mobile assembly 50 can be connected to any position of the conveying part and the storage part 10. Exemplarily, the mobile assembly 50 includes a roller.

[0056] In some embodiments, see Figure 1 The material storage portion 10 is connected to the moving assembly 50 via a supporting assembly.

[0057] Please refer to the pressurized feeding device in this application, which can be based on a certain operating platform when working. For example, the pressurized feeding device in the embodiment of the present application is located on a platform close to the height of the ladle liquid level to reduce the height of the device itself and improve the flexibility of the device.

[0058] In some embodiments, the operating platform includes a track assembly to facilitate the pressurized feeding device to move on the track assembly.

[0059] In some embodiments, the operating platform further comprises a weighing device for accurately weighing materials. For example, a precision alloy scale with a measuring range of 1-5 kg ​​can weigh out the precise amount of aluminum blocks, improving the disadvantage of poor weighing accuracy of the current high-level silo.

[0060] In a second aspect, the present application provides a method for improving the control accuracy of aluminum content in oriented silicon steel, comprising:

[0061] Detect the actual acid-soluble aluminum content of the molten steel in the ladle, and determine the required metal aluminum content based on the theoretical acid-soluble aluminum content and the actual acid-soluble aluminum content;

[0062] Weighing the metal aluminum with the required metal aluminum content, and placing the metal aluminum in the above-mentioned pressurized feeding device for improving the control accuracy of the aluminum content of oriented silicon steel;

[0063] The pressurized feeding device is started to improve the control accuracy of the aluminum content of oriented silicon steel, so that metallic aluminum is added below the liquid surface of the molten steel through the air pressure difference.

[0064] In the embodiments of the present application, the actual acid-soluble aluminum content of the molten steel in the ladle can be measured using methods in the prior art.

[0065] For example, before production, a pure aluminum block with a size of 10-30 mm and a weight of 1-2 tons is prepared on the RH operating platform; a precise alloy scale with a range of 1-5 kg ​​is used to weigh the required aluminum block and put it into the storage part 10 of the pressurized feeding device of the operating platform; the pressurized seal 20 is covered and pressurized to 1.5-2 atmospheres;

[0066] The distal end 32 of the feeding part 30 is inserted into the molten steel with the slag surface broken; the control part 40 is opened, and the aluminum block / aluminum particle is pushed into the molten steel by using the air pressure difference.

[0067] In the above operation, the precise amount of aluminum blocks can be weighed, which improves the current disadvantage of poor weighing accuracy in high-level silos; the aluminum blocks are completely added to the molten steel by utilizing the air pressure difference, which can realize the operation of adding aluminum blocks in small quantities and multiple times, thereby improving the control accuracy of the aluminum content and reducing the secondary oxidation of the aluminum blocks. The aluminum block recovery rate is increased, and the disadvantage of manually throwing aluminum blocks, which is that the aluminum blocks float on the surface of the slag liquid due to their low density and are quickly oxidized into Al2O3 under high temperature conditions and cannot be effectively utilized.

[0068] According to the embodiment of the second aspect of the present application, an alkaline covering agent is used in the tundish to reduce the mutual replacement of silicon with aluminum in the molten steel; 80-200 kg of alkaline covering agent is added when changing ladles during continuous casting to reduce the increase in covering agent gaps caused by fluctuations in the liquid level in the tundish and to reduce secondary oxidation caused by contact between the molten steel and the air.

[0069] Use alkaline covering agents to reduce the mutual replacement of silicon in the acidic covering agent and aluminum in the molten steel;

[0070] When adding alkaline covering agent, the following should be achieved: there should be no exposed surface of the steel liquid in the tundish; when changing tundishes, 80-200kg of covering agent should be added in time to reduce the increase of covering agent gaps caused by fluctuations in the tundish liquid level and reduce secondary oxidation caused by contact between the steel liquid and the air.

[0071] Exemplarily, the amount of alkaline covering agent added is 80kg, 90kg, 100kg, 110kg, 120kg, 130kg, 140kg, 150kg, 160kg, 170kg, 180kg, 190kg, 200kg or an interval range consisting of any two of the above values.

[0072] According to an embodiment of the second aspect of the present application, argon sealing is performed at the water inlet connection between the ladle and the middle ladle, wherein the argon flow rate is between 1-10L / min and the argon pressure is between 0-2Mpa to avoid air inhalation due to pressure difference.

[0073] Make sure to seal the nozzle joints with argon, ensure that the argon gas flow is between 1-10L / min, and the argon gas pressure is between 0-2Mpa, to avoid air inhalation due to pressure difference, secondary oxidation and increased aluminum loss.

[0074] Exemplarily, the argon gas flow rate is 1 L / min, 2 L / min, 3 L / min, 4 L / min, 5 L / min, 6 L / min, 7 L / min, 8 L / min, 9 L / min, 10 L / min or an interval range consisting of any two of the above values.

[0075] Exemplarily, the argon pressure is 0.1 L / min, 0.2 L / min, 0.3 L / min, 0.4 L / min, 0.5 L / min, 0.6 L / min, 0.7 L / min, 0.8 L / min, 0.9 L / min, 1.0 L / min, 1.1 L / min, 1.2 L / min, 1.3 L / min, 1.4 L / min, 1.5 L / min, 1.6 L / min, 1.7 L / min, 1.8 L / min, 1.9 L / min, 2.0 L / min or an interval range consisting of any two of the above values.

[0076] Example

[0077] The following examples more specifically describe the contents disclosed in the present invention, which are intended for illustrative purposes only, as various modifications and variations within the scope of the present invention are obvious to those skilled in the art, and can be used directly without further treatment, and the instruments used in the examples are all commercially available.

[0078] Example 1

[0079] Heat number 4500139, steel grade code Q1, test result of sample 3 after rough adjustment in RH refining furnace is Als: 0.0237%, which is 0.0015% away from the target value. 2.5kg of aluminum particles are accurately weighed by a weighing device on the operating platform and added to the storage part, which is pressurized to 1.5 atmospheres. The control component is opened to allow the aluminum particles to enter the liquid level of the ladle through the feeding part. The water inlet connection between the ladle and the middle ladle is argon sealed, wherein the argon flow rate is 3L / min, the argon pressure is 0.5Mpa, and the steel liquid surface of the middle ladle is not exposed. When changing the ladle, 100kg of covering agent is added in time, and after stirring evenly, the molten steel sample 4 is taken, and the test result is 0.0251%. After taking measures to protect the casting during continuous casting, the middle ladle hits the target value within the range of ±0.0015%.

[0080] Example 2

[0081] The furnace number is 4601927, the steel grade code is Q3, and the result of the test sample 4 after RH rough adjustment is Als: 0.0277%, which is 0.0018% away from the target value. 4kg of aluminum particles are accurately weighed by a weighing device on the operating platform and added to the storage part, which is pressurized to 1.5 atmospheres. The control component is opened to allow the aluminum particles to enter the liquid level of the ladle through the feeding part. The water inlet connection between the ladle and the middle ladle is argon sealed, wherein the argon flow rate is 5L / min, the argon pressure is 1Mpa, and the steel liquid surface of the middle ladle is not exposed. When changing the ladle, 120kg of covering agent is added in time, and after stirring evenly, 5 molten steel samples are taken, and the test result is 0.0292%. After taking measures to protect the casting during continuous casting, the middle ladle hits the target value within the range of ±0.0015%.

[0082] Therefore, by using the pressurized feeding device in the embodiment of the present application to use the air pressure difference to completely add the aluminum block into the molten steel, it is possible to perform the operation of adding aluminum blocks in small quantities and multiple times, thereby improving the control accuracy of the aluminum content, while reducing the secondary oxidation of the aluminum block, increasing the aluminum block yield, and improving the disadvantage of manually throwing aluminum blocks, because the aluminum blocks have low density and float on the surface of the slag liquid, and are quickly oxidized into Al2O3 under high temperature conditions and cannot be effectively utilized.

[0083] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel, characterized in that: include: A material storage part, wherein the material storage part has a material storage space, and the material storage space is used to store materials; A pressurizing seal, the pressurizing seal is detachably connected to the material storage portion, and the pressurizing seal is used to seal and pressurize the material storage portion; and a feeding part, wherein the feeding part has a distal end and a proximal end in its extension direction, and the proximal end is connected to the material storage part to receive the material in the material storage part and transport it to below the liquid steel level in the ladle through the distal end.

2. The pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel according to claim 1 is characterized in that: The material storage portion has a conical structure.

3. The pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel according to claim 1 is characterized in that: In the working state, the distal end is higher than the proximal end in the vertical direction, so that the feeding part is arranged inclined.

4. The pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel according to claim 1, characterized in that: A control member is provided between the material storage portion and the material delivery portion to control the material in the material storage portion to enter the material delivery portion.

5. The pressurized feeding device for improving the control accuracy of aluminum content in oriented silicon steel according to claim 1, characterized in that: It also includes a moving component, which is used to enable the pressurized feeding device to achieve a moving function.

6. A method for improving the control accuracy of aluminum content in oriented silicon steel, characterized in that: include: Detecting the actual acid-soluble aluminum content of the molten steel in the ladle, and determining the required metallic aluminum content based on the theoretical acid-soluble aluminum content and the actual acid-soluble aluminum content; Weighing the metal aluminum with the required metal aluminum content, and placing the metal aluminum in the pressurized feeding device for improving the control accuracy of the aluminum content of oriented silicon steel according to any one of claims 1 to 5; The pressurized feeding device is started to allow the metallic aluminum to be added below the liquid level of the molten steel through the air pressure difference.

7. The method for improving the control accuracy of aluminum content in oriented silicon steel according to claim 6, characterized in that: The tundish uses an alkaline covering agent to reduce the mutual replacement of silicon with aluminum in the molten steel; When changing the ladle during continuous casting, 80-200 kg of the alkaline covering agent is added to reduce the increase of covering agent gaps caused by the fluctuation of the liquid level in the ladle and reduce the secondary oxidation caused by the contact of molten steel with air.

8. The method for improving the control accuracy of aluminum content in oriented silicon steel according to claim 6 or 7, characterized in that: The water inlet connection between the ladle and the middle ladle is sealed with argon, wherein the argon flow rate is between 1-10L / min and the argon pressure is between 0-2Mpa to avoid air inhalation due to pressure difference.

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