Precise feeding and mixing process and device for LF furnace slagging agent

Abstract

The present application relates to the technical fields of steel metallurgy LF refining, and discloses a LF furnace slagging agent precise feeding and mixing process and device, comprising the following steps: S1: setting the target slag basicity according to the target steel grade, and obtaining the composition parameters of the molten steel entering the LF furnace; S2: according to the target basicity and the molten steel composition parameters, determining the theoretical total amount of the slagging agent and the proportion of each component through a slagging agent proportioning quantitative calculation model; in the present application, a set of "feeding, stirring and spraying dispersion" linkage type mixing device is constructed by setting the support frame, mixing tank, feeding pipe, hopper, shell, mixing mechanism, intermittent opening and closing mechanism and spouting mechanism, realizing the pre-dispersion of the slagging agent before entering the mixing tank and the forced mixing after entering, effectively solving the technical problems of material bottoming and uneven mixing caused by one-time feeding of the traditional device, and providing hardware support for improving the mixing uniformity of the slagging agent and the slagging speed.

Description

Technical Field

[0001] This invention relates to the field of LF refining technology in iron and steel metallurgy, specifically to a process and apparatus for precise feeding and mixing of slagging agents in LF furnaces. Background Technology

[0002] The LF furnace is an important refining device in the steel production process. One of its main functions is to form reducing slag by adding slag-forming agents (lime, fluorite, pre-melted refining slag, etc.), thereby achieving desulfurization, deoxidation, and inclusion adsorption. The amount and timing of the slag-forming agent added directly affect the refining effect and power consumption.

[0003] In the slagging process of LF furnace, the slagging agent needs to be mixed by a mixing device. During the mixing process, the raw materials are often added into the mixing device at one time. During the mixing process, some raw materials are prone to settling to the bottom, resulting in insufficient mixing of the slagging agent, which in turn affects the slagging speed and the submerged arc effect. To address this issue, we propose a precise feeding and mixing process and apparatus for LF furnace slagging agents to solve the problem. Summary of the Invention

[0004] The purpose of this invention is to provide a process and apparatus for precise feeding and mixing of slagging agent in an LF furnace, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a process for precise feeding and mixing of slagging agent in an LF furnace, comprising the following steps: S1: Set the target basicity of the slag according to the target steel grade, and obtain the composition parameters of the molten steel entering the LF furnace; S2: Based on the target alkalinity and steel composition parameters, the theoretical total amount of slag-forming agent and the proportion of each component are determined by using a quantitative calculation model for slag-forming agent proportion; S3: Divide the slag-forming agent into multiple batches and add them sequentially before the LF furnace is powered on, when the temperature is raised to the first preset temperature, and when the temperature is raised to the second preset temperature; S4: Each batch of slag-forming agent is mixed thoroughly by a mixing device before being added. S5: During the feeding process, control the LF furnace bottom to blow argon gas for strong stirring, and switch to weak stirring after the feeding is completed; S6: Real-time monitoring of slag layer thickness inside the LF furnace; when the slag layer thickness is lower than the preset threshold, supplementary feeding is initiated.

[0006] Preferably, the quantitative calculation model for the slag-forming agent ratio in step S2 determines the amount of lime to be added based on the stoichiometric relationship between the silicon content in molten steel and the calcium oxide requirement, and determines the amount of fluorite and pre-melted refining slag to be added according to a preset ratio based on the amount of lime to be added.

[0007] Preferably, in step S3, the slag-forming agent is added in 3-5 batches, with the first batch accounting for 40%-50% of the total amount, the second batch accounting for 20%-25% of the total amount, and the third batch accounting for 15%-20% of the total amount.

[0008] Preferably, the mixing device used in step S4 is the LF furnace slagging agent precise feeding and mixing device, which includes a support frame and a mixing tank. The mixing tank is fixedly installed on the top of the support frame, a feed pipe is fixedly connected to one side of the mixing tank, a hopper is fixedly connected to the top of the feed pipe, and a shell is fixedly installed on the top of the mixing tank. A mixing mechanism is fixedly mounted on the housing, and the mixing mechanism causes the material to rise through a double agitation method; An intermittent opening and closing mechanism is fixedly installed on the feed pipe, and the intermittent opening and closing mechanism realizes the intermittent opening of the feed pipe through the extrusion transmission of the mixing mechanism; The jetting mechanism is fixedly installed on the mixing tank. The jetting mechanism intermittently jets compressed gas to disperse the falling material.

[0009] Preferably, the mixing mechanism includes a motor fixedly installed on the top of the housing, the output end of the motor extending into the interior of the housing and fixedly connected to a transmission rod, a large gear fixedly connected to the bottom of the transmission rod, small gears meshing with both sides of the large gear, a stirring rod fixedly connected to the bottom of the small gear, and stirring blades fixedly connected to the surface of the stirring rod.

[0010] Preferably, the intermittent opening and closing mechanism includes a cam fixedly connected to the surface of the transmission rod, a pressing block is provided on one side of the cam, a linkage rod is fixedly connected to one side of the pressing block, a baffle is fixedly connected to one end of the linkage rod, one end of the baffle extends into the interior of the feed tube, a spring block is fixedly connected to the top of the baffle, a spring is fixedly connected to one side of the spring block, and one end of the spring is fixedly connected to one side of the feed tube.

[0011] Preferably, the jetting mechanism includes a cylinder fixedly connected to the top of the mixing tank. One side of the cylinder is fixedly connected to an air inlet pipe via a one-way valve, and the bottom of the cylinder is fixedly connected to an air jet pipe via a one-way pressure valve. The bottom of the air jet pipe extends into the interior of the mixing tank. A piston plate is provided inside the cylinder, and a piston rod is fixedly connected to the top of the piston plate. The top of the piston rod extends into the top of the cylinder. A connecting rod is provided at the connection between the piston rod and the linkage rod, and the piston rod is hinged to the linkage rod.

[0012] Preferably, a sliding rod is fixedly connected to one side of the feed pipe, and a sliding hole is provided on one side of the rebound block to cooperate with the sliding rod.

[0013] Preferably, the bottom of the pinion is provided with a bearing, and is rotatably connected to the top of the mixing tank through the bearing.

[0014] Preferably, the stirring blades are arranged in an auger shape, which can turn the material upward when the stirring blades rotate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention features a mixing mechanism that uses a motor to drive a large gear, which in turn drives two smaller gears on either side, thereby rotating two stirring rods and stirring blades. This achieves a highly efficient transmission structure with a single motor driving multiple stirring shafts. Simultaneously, the two stirring blades form a double stirring zone within the mixing tank, significantly improving the circulation flow of the slag-forming agent and the overall mixing uniformity. Furthermore, the auger-shaped stirring blades tumble the material at the bottom upwards during the mixing process, further enhancing the uniformity of the mixing. This invention features an intermittent opening and closing mechanism. As the transmission rod rotates, it drives the cam to periodically squeeze the extrusion block. When the cam's protruding end contacts the extrusion block, the extrusion block moves away from the cam, simultaneously moving the linkage rod and baffle. This causes the baffle to enter the feed pipe, preventing the material from falling normally. When the cam rotates to a point where it no longer contacts the extrusion block, the spring force causes the return block and baffle to reset, preventing the baffle from blocking the material from falling normally. This intermittent automatic opening and closing of the feed pipe allows the material to be fed into the mixing tank intermittently, avoiding local accumulation and mixing dead zones caused by continuous feeding, thereby improving the uniformity of mixing. This invention employs a jetting mechanism. During the reciprocating movement of the linkage rod, the piston rod and piston plate move up and down via the connecting rod. When the piston plate moves upward, a negative pressure is created inside the cylinder, allowing external air to be drawn into the cylinder through the air inlet pipe. When the piston plate moves downward, the gas is compressed. When the pressure reaches the one-way pressure valve, the compressed gas is pulsed out through the jet pipe, thereby dispersing the falling material through airflow impact before it enters the mixing liquid. This effectively prevents powder agglomeration and clumping, further improving the dispersion uniformity of the slag-forming agent when it enters the mixing tank, and providing a better initial dispersion state for subsequent stirring and mixing. Attached Figure Description

[0016] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure in this invention; Figure 3 This is a perspective view of the linkage rod in this invention, viewed from below. Figure 4 This is a perspective view taken in cross-section in this invention; Figure 5 For the present invention Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a perspective view of a partial structure in this invention; Figure 7 This is a perspective view of the mixing mechanism in this invention; Figure 8 This is a perspective view of the intermediate discontinuity opening and closing mechanism of the present invention.

[0017] In the diagram: 1. Support frame; 2. Mixing tank; 3. Feed pipe; 4. Hopper; 5. Shell; 6. Motor; 7. Transmission rod; 8. Large gear; 9. Small gear; 10. Stirring rod; 11. Stirring blade; 12. Cam; 13. Extrusion block; 14. Linkage rod; 15. Baffle; 16. Rebound block; 17. Spring; 18. Cylinder; 19. Air inlet pipe; 20. Jet pipe; 21. Piston plate; 22. Piston rod; 23. Connecting rod; 24. Sliding rod; 25. Sliding hole; 26. Bearing. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-8 As shown, A process for precise feeding and mixing of slagging agent in an LF furnace includes the following steps: S1: Set the target basicity of the slag according to the target steel grade, and obtain the composition parameters of the molten steel entering the LF furnace; S2: Based on the target basicity and steel composition parameters, the theoretical total amount of slag-forming agent and the proportion of each component are determined through a quantitative calculation model for slag-forming agent proportion; S3: Divide the slagging agent into multiple batches and add them sequentially before the LF furnace is powered on, when the temperature is raised to the first preset temperature, and when the temperature is raised to the second preset temperature. S4: Each batch of slag-forming agent is mixed thoroughly by a mixing device before being added. S5: During the feeding process, control the LF furnace bottom to blow argon gas for strong stirring, and switch to weak stirring after the feeding is completed; S6: Real-time monitoring of slag layer thickness inside the LF furnace; when the slag layer thickness is lower than the preset threshold, supplementary feeding is initiated.

[0020] This invention establishes a complete process flow of "target alkalinity setting → component acquisition → quantitative calculation → batch feeding → mixing treatment → argon gas synergy → slag thickness closed loop", which realizes the full-process automated and precise control of slag-forming agent from metering to refining. It effectively avoids alkalinity fluctuations caused by relying on experience judgment in traditional processes, and improves the stability of desulfurization effect and the consistency of refining effect between different furnaces.

[0021] The quantitative calculation model for slag-forming agent proportion in step S2 determines the amount of lime to be added based on the stoichiometric relationship between the silicon content in molten steel and the calcium oxide requirement, and determines the amount of fluorite and pre-melted refining slag to be added according to the lime addition amount in a preset ratio.

[0022] In this invention, the amount of lime added is quantitatively determined by the stoichiometric relationship between the silicon content in molten steel and the amount of calcium oxide required. Based on the amount of lime, fluorite and pre-melted refining slag are automatically proportioned according to a preset ratio. This achieves precise quantitative determination of the proportion of each component of the slag-forming agent, avoids the proportioning deviation caused by manual estimation, ensures that the slag alkalinity accurately meets the target requirements, and provides quantitative guarantee for stable desulfurization effect.

[0023] In step S3, the slag-forming agent is added in 3-5 batches. The first batch is 40%-50% of the total amount, the second batch is 20%-25% of the total amount, and the third batch is 15%-20% of the total amount.

[0024] In this invention, the slag-forming agent is divided into 3 to 5 batches, with the first batch at 40% to 50%, the second batch at 20% to 25%, and the third batch at 15% to 20% in a gradient decreasing feeding ratio. This avoids the problems of excessively thick slag layer, reduced submerged arc effect, and increased power consumption caused by traditional one-time large-scale feeding. At the same time, the gradient decreasing feeding method matches the heating process of the LF furnace, which not only ensures rapid slag formation in the early stage of slag formation, but also avoids the extra power consumption caused by excessive feeding in the later stage of refining, significantly improving heating efficiency and refining economy.

[0025] The mixing device used in step S4 is the precise feeding and mixing process and device for the LF furnace slagging agent, including a support frame 1 and a mixing tank 2. The mixing tank 2 is fixedly installed on the top of the support frame 1. A feed pipe 3 is fixedly connected to one side of the mixing tank 2. A hopper 4 is fixedly connected to the top of the feed pipe 3. A shell 5 is fixedly installed on the top of the mixing tank 2. The mixing mechanism is fixedly mounted on the housing 5. The mixing mechanism causes the material to rise through a double agitation. Intermittent opening and closing mechanism, the intermittent opening and closing mechanism is fixedly installed on the feed pipe 3, and the intermittent opening and closing mechanism realizes the intermittent opening of the feed pipe 3 through the extrusion transmission of the mixing mechanism; The jetting mechanism is fixedly installed on the mixing tank 2. The jetting mechanism will intermittently jet out compressed gas to disperse the falling material.

[0026] This invention constructs a linkage mixing device that "feeds, stirs, and disperses simultaneously" by setting up a support frame 1, a mixing tank 2, a feed pipe 3, a hopper 4, a shell 5, a mixing mechanism, an intermittent opening and closing mechanism, and a spraying mechanism. This realizes the pre-dispersion of the slag-forming agent before entering the mixing tank 2 and the forced mixing after entering. It effectively solves the technical problems of material settling and uneven mixing caused by one-time feeding in traditional devices, and provides hardware guarantee for improving the mixing uniformity and slag-forming speed of the slag-forming agent.

[0027] The mixing mechanism includes a motor 6 fixedly installed on the top of the housing 5. The output end of the motor 6 extends into the interior of the housing 5 and is fixedly connected to a transmission rod 7. A large gear 8 is fixedly connected to the bottom of the transmission rod 7. Small gears 9 are meshed on both sides of the large gear 8. An agitator 10 is fixedly connected to the bottom of the small gear 9. A stirring blade 11 is fixedly connected to the surface of the agitator 10.

[0028] In this invention, a mixing mechanism is set up, and the starting motor 6 drives the large gear 8 to rotate. The large gear 8 will synchronously drive the small gears 9 on both sides to rotate, thereby driving the two stirring rods 10 and stirring blades 11 to rotate synchronously. This realizes a high-efficiency transmission structure of a single motor 6 driving multiple stirring shafts. At the same time, the two stirring blades 11 form a double stirring area in the mixing tank 2, which significantly improves the circulation flow of the slag-forming agent in the mixing tank 2 and the overall mixing uniformity. In addition, the stirring blades 11 are auger-shaped, which will turn the material at the bottom upward during the stirring process, further improving the mixing uniformity.

[0029] The intermittent opening and closing mechanism includes a cam 12 fixedly connected to the surface of the transmission rod 7. A pressing block 13 is provided on one side of the cam 12. A linkage rod 14 is fixedly connected to one side of the pressing block 13. A baffle 15 is fixedly connected to one end of the linkage rod 14. One end of the baffle 15 extends into the interior of the feed pipe 3. A spring block 16 is fixedly connected to the top of the baffle 15. A spring 17 is fixedly connected to one side of the spring block 16. One end of the spring 17 is fixedly connected to one side of the feed pipe 3.

[0030] In this invention, an intermittent opening and closing mechanism is set up. When the transmission rod 7 rotates, it drives the cam 12 to periodically squeeze the extrusion block 13. When the protruding end of the cam 12 contacts the extrusion block 13, the extrusion block 13 moves away from the cam 12, and at the same time drives the linkage rod 14 and the baffle 15 to move, so that the baffle 15 enters the feed pipe 3 and prevents the material from falling normally. When the cam 12 rotates to the point where it no longer contacts the extrusion block 13, the elastic force generated by the spring 17 will drive the return block 16 and the baffle 15 to reset, so that the baffle 15 no longer prevents the material from falling normally. This realizes the intermittent automatic opening and closing of the feed pipe 3, so that the material is fed into the mixing tank 2 in an intermittent manner, avoiding local accumulation and mixing dead corners caused by continuous feeding, thereby improving the uniformity of mixing.

[0031] The jetting mechanism includes a cylinder 18 fixedly connected to the top of the mixing tank 2. One side of the cylinder 18 is fixedly connected to an air inlet pipe 19 via a one-way valve. The bottom of the cylinder 18 is fixedly connected to a jet pipe 20 via a one-way pressure valve. The bottom of the jet pipe 20 extends into the interior of the mixing tank 2. A piston plate 21 is provided inside the cylinder 18. A piston rod 22 is fixedly connected to the top of the piston plate 21. The top of the piston rod 22 extends into the top of the cylinder 18. A connecting rod 23 is provided at the connection between the piston rod 22 and the linkage rod 14, and the piston rod 22 is hinged to the linkage rod 23.

[0032] In this invention, by setting up a jetting mechanism, during the reciprocating movement of the linkage rod 14, the piston rod 22 and piston plate 21 will reciprocate up and down through the connecting rod 23. When the piston plate 21 moves upward, the cylinder 18 is under negative pressure, which allows external air to be drawn into the cylinder 18 through the air inlet pipe 19. When the piston plate 21 moves downward, the gas is compressed. When the pressure reaches the one-way pressure valve, the compressed gas is pulsed out through the jet pipe 20, thereby dispersing the falling material by airflow impact before it enters the mixing liquid. This effectively prevents the powder from agglomerating and clumping, further improving the dispersion uniformity of the slag-forming agent when it enters the mixing tank 2, and providing a better initial dispersion state for subsequent stirring and mixing.

[0033] A sliding rod 24 is fixedly connected to one side of the feed pipe 3, and a sliding hole 25 that cooperates with the sliding rod 24 is opened on one side of the rebound block 16.

[0034] In this invention, by setting the sliding rod 24 and the sliding hole 25, the reciprocating motion of the baffle 15 can be guided and limited, ensuring the smoothness and positional accuracy of the opening and closing action of the baffle 15 in the feed pipe 3, while avoiding the jamming or poor sealing caused by the skewness of the baffle 15, thus improving the operational stability and service life of the feed control mechanism.

[0035] The bottom of the pinion 9 is provided with a bearing 26, and is rotatably connected to the top of the mixing tank 2 through the bearing 26.

[0036] In this invention, by setting a bearing 26 at the bottom of the pinion 9 and rotatably connecting the bearing 26 to the top of the mixing tank 2, the frictional resistance of the pinion 9 during rotation is effectively reduced, transmission loss is reduced, and the coaxiality and stability of the stirring rod 10 rotation are ensured, thereby improving the reliability and stirring accuracy of the mixing mechanism during long-term operation.

[0037] The stirring blade 11 is arranged in an auger shape, and when the stirring blade 11 rotates, it can flip the material upward.

[0038] In this invention, by setting the stirring blade 11 as an auger, when the stirring blade 11 rotates, the material at the bottom of the mixing tank 2 can be continuously turned upward, which effectively avoids the deposition of powder with a larger specific gravity at the bottom of the mixing tank 2, so that the material in the tank forms a bottom-up circulating flow in the vertical direction, which significantly improves the overall mixing uniformity of the material and eliminates mixing dead corners and bottom dead zones.

[0039] The working principle and usage process of this invention: During operation, the material is added into the hopper 4, and then the motor 6 is started to drive the large gear 8 to rotate. The large gear 8 will synchronously drive the small gears 9 on both sides to rotate, thereby driving the two stirring rods 10 and stirring blades 11 to rotate synchronously. This realizes a high-efficiency transmission structure of a single motor 6 driving multiple stirring shafts. At the same time, the two stirring blades 11 form a double stirring area in the mixing tank 2, which significantly improves the circulation flow of the slag-forming agent in the mixing tank 2 and the overall mixing uniformity. Meanwhile, the stirring blades 11 are auger-shaped, which will turn the material at the bottom upward during the stirring process, further improving the mixing uniformity. As the transmission rod 7 rotates, it drives the cam 12 to periodically squeeze the extrusion block 13. When the protruding end of the cam 12 contacts the extrusion block 13, the extrusion block 13 moves away from the cam 12, which in turn drives the linkage rod 14 and the baffle 15 to move, so that the baffle 15 enters the feed pipe 3 and prevents the material from falling normally. When the cam 12 rotates to the point where it no longer contacts the extrusion block 13, the elastic force generated by the spring 17 will drive the return block 16 and the baffle 15 to reset, so that the baffle 15 no longer prevents the material from falling normally. This realizes the intermittent automatic opening and closing of the feed pipe 3, so that the material is fed into the mixing tank 2 in an intermittent manner, avoiding local accumulation and mixing dead corners caused by continuous feeding, thereby improving the uniformity of mixing. During the reciprocating movement of the linkage rod 14, the piston rod 22 and piston plate 21 will move up and down reciprocally through the connecting rod 23. When the piston plate 21 moves upward, the cylinder 18 is under negative pressure, which allows external air to be drawn into the cylinder 18 through the air inlet pipe 19. When the piston plate 21 moves downward, the gas is compressed. When the pressure reaches the one-way pressure valve, the compressed gas is pulsed out through the jet pipe 20, thereby dispersing the falling material by airflow impact before it enters the mixing liquid. This effectively prevents the powder from agglomerating and clumping, further improving the dispersion uniformity of the slag-forming agent when it enters the mixing tank 2, and providing a better initial dispersion state for subsequent stirring and mixing.

[0040] The structure used in this application can be additionally fitted with protective measures that are common knowledge in the field of this technology under different usage environments, including but not limited to the following methods, such as protective covers for equipment protection, dustproof nets for equipment dust prevention, and sealing components or waterproof coatings for equipment waterproofing, which are commonly used by those skilled in the art.

[0041] It should be noted that (motor 6 and spring 17) are existing devices or equipment, or devices or equipment that can be implemented by existing technology. The power supply, connection method, usage method, power source, fixing method, installation method, control method, etc. of the device, as well as the materials of each accessory and the selection of various parameters are common knowledge to those skilled in the art, and therefore will not be described in detail in this application document.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precise feeding and mixing process for slagging agent in an LF furnace, characterized in that, Includes the following steps: S1: Set the target basicity of the slag according to the target steel grade, and obtain the composition parameters of the molten steel entering the LF furnace; S2: Based on the target alkalinity and steel composition parameters, the theoretical total amount of slag-forming agent and the proportion of each component are determined by using a quantitative calculation model for slag-forming agent proportion; S3: Divide the slag-forming agent into multiple batches and add them sequentially before the LF furnace is powered on, when the temperature is raised to the first preset temperature, and when the temperature is raised to the second preset temperature; S4: Each batch of slag-forming agent is mixed thoroughly by a mixing device before being added. S5: During the feeding process, control the LF furnace bottom to blow argon gas for strong stirring, and switch to weak stirring after the feeding is completed; S6: Real-time monitoring of slag layer thickness inside the LF furnace; when the slag layer thickness is lower than the preset threshold, supplementary feeding is initiated.

2. The precise feeding and mixing process for LF furnace slagging agent according to claim 1, characterized in that: The quantitative calculation model for the slag-forming agent ratio in step S2 determines the amount of lime to be added based on the stoichiometric relationship between the silicon content in molten steel and the calcium oxide requirement, and determines the amount of fluorite and pre-melted refining slag to be added according to a preset ratio based on the amount of lime added.

3. The precise feeding and mixing process for LF furnace slagging agent according to claim 1, characterized in that: In step S3, the slag-forming agent is added in 3-5 batches. The first batch is 40%-50% of the total amount, the second batch is 20%-25% of the total amount, and the third batch is 15%-20% of the total amount.

4. The precise feeding and mixing device for LF furnace slagging agent according to claim 1, characterized in that: The mixing device used in step S4 is the LF furnace slag-forming agent precise feeding and mixing device, which includes a support frame (1) and a mixing tank (2). The mixing tank (2) is fixedly installed on the top of the support frame (1). A feed pipe (3) is fixedly connected to one side of the mixing tank (2). A hopper (4) is fixedly connected to the top of the feed pipe (3). A shell (5) is fixedly installed on the top of the mixing tank (2). A mixing mechanism is fixedly mounted on the housing (5), and the mixing mechanism causes the material to rise by a double stirring method; Intermittent opening and closing mechanism, the intermittent opening and closing mechanism is fixedly installed on the feed pipe (3), the intermittent opening and closing mechanism realizes the intermittent opening of the feed pipe (3) through the extrusion transmission of the mixing mechanism. The jetting mechanism is fixedly installed on the mixing tank (2). The jetting mechanism will intermittently jet out compressed gas to disperse the falling material.

5. The precise feeding and mixing device for LF furnace slagging agent according to claim 4, characterized in that: The mixing mechanism includes a motor (6) fixedly installed on the top of the housing (5). The output end of the motor (6) extends into the interior of the housing (5) and is fixedly connected to a transmission rod (7). A large gear (8) is fixedly connected to the bottom of the transmission rod (7). Small gears (9) are meshed on both sides of the large gear (8). A stirring rod (10) is fixedly connected to the bottom of the small gear (9). A stirring blade (11) is fixedly connected to the surface of the stirring rod (10).

6. The precise feeding and mixing device for LF furnace slagging agent according to claim 5, characterized in that: The intermittent opening and closing mechanism includes a cam (12) fixedly connected to the surface of the transmission rod (7). A pressing block (13) is provided on one side of the cam (12). A linkage rod (14) is fixedly connected to one side of the pressing block (13). A baffle (15) is fixedly connected to one end of the linkage rod (14). One end of the baffle (15) extends into the interior of the feed pipe (3). A spring block (16) is fixedly connected to the top of the baffle (15). A spring (17) is fixedly connected to one side of the spring block (16). One end of the spring (17) is fixedly connected to one side of the feed pipe (3).

7. The precise feeding and mixing device for LF furnace slagging agent according to claim 6, characterized in that: The jetting mechanism includes a cylinder (18) fixedly connected to the top of the mixing tank (2). One side of the cylinder (18) is fixedly connected to an air inlet pipe (19) via a one-way valve. The bottom of the cylinder (18) is fixedly connected to a jet pipe (20) via a one-way pressure valve. The bottom of the jet pipe (20) extends into the interior of the mixing tank (2). A piston plate (21) is provided inside the cylinder (18). A piston rod (22) is fixedly connected to the top of the piston plate (21). The top of the piston rod (22) extends into the top of the cylinder (18). A connecting rod (23) is provided at the connection between the piston rod (22) and the linkage rod (14), and the piston rod (22) is hinged to the linkage rod (23).

8. The precise feeding and mixing device for LF furnace slagging agent according to claim 5, characterized in that: A sliding rod (24) is fixedly connected to one side of the feed pipe (3), and a sliding hole (25) is provided on one side of the spring block (16) to cooperate with the sliding rod (24).

9. The precise feeding and mixing device for LF furnace slagging agent according to claim 4, characterized in that: The bottom of the pinion (9) is provided with a bearing (26), and is rotatably connected to the top of the mixing tank (2) through the bearing (26).

10. The precise feeding and mixing device for LF furnace slagging agent according to claim 4, characterized in that: The stirring blade (11) is arranged in an auger shape, and when the stirring blade (11) rotates, it can flip the material upward.

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