A method and apparatus for producing low calcium low aluminum steel

Abstract

The application discloses a method and a production equipment for smelting low-calcium and low-aluminum steel, and the method comprises the following steps: step one, BOF steel smelting operation treatment; step two, LF refining operation treatment; and step three, continuous casting operation treatment, which are completed by using a smelting low-calcium and low-aluminum steel production equipment, wherein the smelting low-calcium and low-aluminum steel production equipment comprises a ladle, a rotary driving assembly, a floating oxygen supply assembly, a decontamination guide mechanism and an impurity treatment mechanism, the ladle comprises a ladle body and a mounting frame mounted on the upper end of the ladle body, the rotary driving assembly is vertically mounted on the top of the mounting frame, and the floating oxygen supply assembly is located below the mounting frame and is used in cooperation with the rotary driving assembly. In the application, the high oxygen content of the molten steel from the converter is used to oxidize calcium, aluminum and titanium in the alloy, and the formed oxides are lighter than the molten steel in density, float to the slag on the surface of the molten steel, and finally enable the calcium, aluminum and titanium content in the steel to be controlled at a low level.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy technology, specifically to a method and production equipment for smelting low-calcium and low-aluminum steel. Background Technology

[0002] Iron and steel smelting is a process that involves high-temperature smelting, reduction, and refining of raw materials such as iron ore or scrap steel to produce steel products with high iron content, low carbon content, and good strength and toughness. Iron and steel smelting is a crucial link in industrial production, providing essential raw materials for manufacturing machinery, construction, and transportation equipment, and making significant contributions to economic and social development. During iron and steel smelting, multiple factors, such as furnace charge composition, furnace temperature, and smelting time, need to be controlled to obtain ideal steel products. There are many types of steel, including special steels. Special steels generally refer to steels with special chemical compositions (alloying), produced using special processes, possessing special microstructure and properties, and meeting special needs. From a steelmaking perspective, special steels have different requirements for chemical elements due to their different specific needs. For example, for cord steel and welding wire steel, the subsequent wire drawing process requires that the levels of calcium, aluminum, and titanium in the steel be controlled at low levels to prevent excessive wire breakage caused by inclusions of calcium, aluminum, and titanium.

[0003] However, existing methods for controlling the calcium, aluminum, and titanium content in steel have the following problems: Currently, steel mills mainly reduce the calcium, aluminum, and titanium content when these alloys are added to molten steel by purchasing expensive, high-purity alloys (low calcium, low aluminum, and low titanium). While this method can reduce the calcium, aluminum, and titanium content in molten steel, the cost of raw materials is high, and there is a lack of methods and equipment for reducing the calcium, aluminum, and titanium content of ordinary alloys. To overcome the increase in calcium, aluminum, and titanium content in steel caused by the addition of ordinary alloys, this invention creatively proposes to utilize the high oxygen content of molten steel from the converter to oxidize the calcium, aluminum, and titanium in the alloys. The resulting oxides, being lighter than molten steel, float to the slag on the surface of the molten steel, ultimately controlling the calcium, aluminum, and titanium content in the steel to a low level. Summary of the Invention

[0004] The purpose of this invention is to provide a method and production equipment for smelting low-calcium and low-aluminum steel. This solves the current problem in steel mills where the main method for smelting this type of steel is to purchase expensive, high-purity (low-calcium, low-aluminum, low-titanium) alloys to reduce the calcium, aluminum, and titanium content of these alloys when added to molten steel. While this method can reduce the calcium, aluminum, and titanium content in molten steel, the cost of the raw materials is high. There is a lack of a method and equipment for reducing the calcium, aluminum, and titanium content of ordinary alloys.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a production equipment for smelting low-calcium and low-aluminum steel, comprising a ladle, a rotary drive assembly, a floating oxygen supply assembly, a slag removal guiding mechanism, and an impurity treatment mechanism. The ladle comprises a ladle body (1) and a mounting frame (2) installed on the upper end of the ladle body (1). The rotary drive assembly is vertically installed on the top of the mounting frame (2). The floating oxygen supply assembly is located below the mounting frame (2) and is used in conjunction with the rotary drive assembly. The slag removal guiding mechanism is built into the ladle body (1) and has a slag discharge pipe connected to its bottom. The slag discharge pipe passes through the mounting frame (2) and is connected to the impurity treatment mechanism. The impurity treatment mechanism is installed on the right side of the mounting frame (2).

[0006] In a preferred embodiment of the present invention, the rotary drive assembly includes a drive motor (3), a drive gear (4), a driven gear (5), and a riser (6). The drive motor (3) is fixedly mounted on the mounting bracket (2) and its power output end is connected to the drive gear (4). The drive gear (4) meshes with the driven gear (5). The riser (6) passes vertically through the driven gear (5) and is fixedly connected to the driven gear (5). The riser (6) is used in conjunction with the floating oxygen supply assembly.

[0007] In a preferred embodiment of the present invention, the floating oxygen supply assembly includes an oxygen delivery pipe (7), a stacked oxygen supply cylinder (8), a deflector plate (9), a floating rod (10), and a blade (11). The oxygen delivery pipe (7) passes through the riser (6) and its lower end is connected to the stacked oxygen supply cylinder (8). The stacked oxygen supply cylinder (8) is located inside the ladle body (1). The deflector plate (9) is installed at the lower end of the riser (6) and is inclined. The floating rod (10) is inserted longitudinally into the stacked oxygen supply cylinder (8) and its lower end is fixedly connected to the bottom of the stacked oxygen supply cylinder (8). The floating rod (10) passes through the blade (11) and its upper end is fitted with a spring (12). The lower end of the spring (12) is in contact with the blade (11). The floating rod (10) is used in conjunction with the deflector plate (9).

[0008] As a preferred embodiment of the present invention, the stacked oxygen supply cylinder (8) is composed of several sets of discs (13), the several sets of discs (13) are stacked, the interior of the discs (13) is formed with several sets of air guiding channels (14), the outer end of the air guiding channel (14) is connected to an oxygen outlet nozzle (15), and the oxygen delivery pipe (7) passes through the middle of the discs (13) and is connected to the air guiding channel (14).

[0009] In a preferred embodiment of the present invention, the impurity removal guiding mechanism includes a vortex disk (16), a vertical rod (17), a spiral blade (18), an arc plate (19), a sludge collection ball (20), and a servo motor (21). The middle part of the vortex disk (16) is connected to the vertically arranged vertical rod (17). The spiral blade (18) is arranged in several groups and evenly installed on the vertical rod (17). The arc plate (19) is located on one side of the vertical rod (17). The upper end of the vertical rod (17) passes through the sludge collection ball (20). A second blade (22) is installed below the sludge collection ball (20). The second blade (22) is installed on the top of the ladle body (1). The servo motor (21) is installed on the top of the sludge collection ball (20), and its power output end is connected to the vertical rod (17).

[0010] As a preferred embodiment of the present invention, the swirl disk (16) includes a main disk (23) and a plurality of groups of baffles (24) fixed around the main disk (23), wherein the plurality of groups of baffles (24) are equidistantly distributed.

[0011] In a preferred embodiment of the present invention, the impurity treatment mechanism includes a receiving funnel (38), a guide plate (25), a driver (26), a connecting rod (27), and a rubbing plate (28). The lower end of the receiving funnel (38) is connected to the guide plate (25). An inner cavity (29) is formed inside the guide plate (25). Adjustment grooves (30) are machined on both sides of the inner cavity (29). The rubbing plate (28) is provided in two sets and is located in the two sets of adjustment grooves (30). Inside 30), the rubbing board (28) has several sets of blades (31) on its body. The upper end of the rubbing board (28) is connected to two sets of connecting rods (27). The guide plate (25) has floating grooves (32) on both the left and right sides. The floating grooves (32) have elastic pads (33) inside them. The upper end of the connecting rods (27) is located in the floating grooves (32) and is in contact with the elastic pads (33). The connecting rods (27) are used in conjunction with the driver (26).

[0012] In a preferred embodiment of the present invention, the driver (26) includes a drive motor (34), a rotating wheel (35), a toggle block (36), and a crossbeam (37). The drive motor (34) is mounted on the front end of the guide plate (25) and its power output end is connected to the rotating wheel (35). The toggle block (36) is divided into two groups and symmetrically mounted on the rotating wheel (35). The toggle block (36) has an arc-shaped structure and contacts the two groups of crossbeams (37). The crossbeams (37) are connected to the connecting rod (27).

[0013] As a preferred embodiment of the present invention, the processing steps are as follows:

[0014] Step 1: BOF steelmaking operation: Utilizing the high oxygen content in molten steel during BOF oxygen blowing smelting, ordinary alloys and slag-forming materials are added to the ladle in one go. The molten steel is strongly stirred using argon gas. Simultaneously, oxygen is introduced into the stacked oxygen supply cylinder (8) through the oxygen supply pipe (7) to supply oxygen to the molten steel. The drive motor (3) drives the drive gear (4), which in turn drives the driven gear (5) to rotate. The driven gear (5) drives the riser (6) to rotate synchronously. During the rotation of the riser (6), the actuating plate (9) rotates. Each rotation of the actuating plate (9)... One rotation acts on the floating rod (10), pressing down the floating rod (10) once, causing the floating rod (10) to press down on the stacked oxygen supply cylinder (8) for telescopic adjustment. The disc (13) floats up and down and disturbs the molten steel inside, so that oxygen is introduced into the molten steel more quickly to react, accelerating the chemical reaction between calcium, aluminum, and titanium in the alloy and oxygen in the molten steel and floating to the slag on the surface of the molten steel. At this time, the main disc (23) drives the turbulence plate (24) to rotate, so that the slag in the molten steel is guided to the position of the vortex disc (16). The servo motor (21) drives the upright (17) to rotate. During the rotation of the upright (17) The spiral blades (18) guide the scum upwards and into the sludge collection ball (20), achieving the purpose of automatically moving and discharging the scum upwards. The scum is then guided into the receiving funnel (38) through the scum discharge pipe. The scum is then guided into the inner cavity (29). The drive motor (34) drives the rotating wheel (35) to rotate. During the rotation of the rotating wheel (37), the two sets of actuating blocks (36) rotate synchronously, causing the actuating blocks (36) to act on the two sets of crossbeams (37), causing the two sets of crossbeams (37) to move up and down respectively. The movement of the crossbeams (37) causes the connecting rod (27) to drive the two sets of washboards (28) to move in the direction of adjustment. The trough (30) moves up and down, and two sets of rubbing plates (28) perform staggered crushing of the slag inside and discharge it to achieve efficient treatment of calcium, aluminum and titanium contained in the alloy in the molten steel. At the same time, according to the oxygen content of the molten steel, add 21-22 kg / t of high silicon manganese containing 27% Si and 64% Mn, 6-8 kg / t of ferrosilicon, and 5-7 kg / t of lime. Control the first sample of the refining furnace to C≤0.05%, Si=0.85%-0.90%, Mn=1.44%-1.49%, control the bottom blowing argon flow rate of the ladle to 500-800NL / min, and control the time to 5-8min.

[0015] Step 2: LF Refining Operation: Due to the low oxygen content in the molten steel during LF refining, it is necessary to add less or no alloying and use auxiliary materials for deoxidation. In addition, ferrosilicon powder is also used for deoxidation during the refining process, with the total amount controlled at 1-1.5 kg / t. The target final slag basicity is controlled at 1.5-1.9. For a small amount of alloying that needs to be added, low-titanium and low-aluminum ferrosilicon is used. It is forbidden to add calcium-containing auxiliary materials such as lime and silicon-calcium wire.

[0016] Step 3: Continuous casting operation: After refining, continuous casting is carried out. Continuous casting requires steel retention in the ladle to prevent calcium, aluminum, and titanium oxides in the slag on the molten steel from entering the steel. Steel produced by this method has a calcium content of less than 4 ppm, an aluminum content of less than 30 ppm, and a titanium content of less than 25 ppm.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This invention employs a BOF (Boiling-Off) steelmaking-LF (Fluorescent Ladle) refining-continuous casting process for producing low-calcium, low-aluminum steel. Utilizing the high oxygen content in the molten steel during the BOF process (oxygen blowing), ordinary alloys and slag-forming materials are added to the ladle in a single step. The molten steel is then strongly stirred using argon gas to accelerate the chemical reaction between the calcium, aluminum, and titanium in the alloys and the oxygen in the molten steel, causing them to float to the slag on the surface. During the LF refining process, due to the lower oxygen content in the molten steel, less or no alloy is added; only auxiliary materials are used for deoxidation. After refining, continuous casting is performed. Continuous casting requires a ladle-retaining operation (to prevent calcium, aluminum, and titanium oxides from the slag on the surface from entering the steel). Steel produced using this method has a calcium content below 4 ppm, an aluminum content below 30 ppm, and a titanium content below 25 ppm.

[0019] 2. This invention also designs a low-calcium, low-aluminum steel smelting equipment for use in conjunction with a method for smelting low-calcium, low-aluminum steel. This equipment includes a ladle, a rotary drive assembly, a floating oxygen supply assembly, a purification and guiding mechanism, and an impurity treatment mechanism. During the oxygen blowing smelting process of the alloy in the molten steel using the BOF process, the rotary drive assembly drives the floating oxygen supply assembly to float up and down, which greatly improves the oxygen supply efficiency to the molten steel. Furthermore, the purification and guiding mechanism guides the floating slag in the molten steel upwards and discharges it. Finally, the impurity treatment mechanism crushes the discharged slag for subsequent recycling and reuse. Using the above method can greatly improve the processing efficiency of smelting low-calcium, low-aluminum steel. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the present invention;

[0021] Figure 2 This is a structural diagram of the floating oxygen supply component described in this invention;

[0022] Figure 3 This is a cross-sectional view of the stacked oxygen supply cylinder described in this invention;

[0023] Figure 4 This is a structural diagram of the impurity removal and guiding mechanism described in this invention;

[0024] Figure 5 This is a partial structural diagram of the present invention (A section).

[0025] Figure 6 This is a structural diagram of the washboard described in this invention.

[0026] In the diagram: 1. Steel ladle body; 2. Mounting frame; 3. Drive motor; 4. Drive gear; 5. Driven gear; 6. Riser; 7. Oxygen supply pipe; 8. Stacked oxygen supply cylinder; 9. Actuating plate; 10. Floating rod; 11. Blade 1; 12. Spring; 13. Disc; 14. Air guide cavity; 15. Oxygen nozzle; 16. Swirl disc; 17. Riser; 18. Spiral blade; 19. Arc plate; 20. Sludge collection ball; 21. Servo motor; 22. Blade 2; 23. Main disc; 24. Baffle plate; 25. Guide plate; 26. Driver; 27. Connecting rod; 28. Corrugated board; 29. ​​Inner cavity; 30. Adjusting groove; 31. Blade; 32. Floating groove; 33. Elastic gasket; 34. Transmission motor; 35. Rotating wheel; 36. Actuating block; 37. Crossbeam; 38. Receiving funnel. Detailed Implementation

[0027] 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.

[0028] Please see Figure 1-6 This invention provides a technical solution: a method for smelting low-calcium, low-aluminum steel, the specific processing steps of which are as follows:

[0029] Step 1: BOF Steelmaking Operation: Utilizing the high oxygen content in molten steel produced during the BOF process (oxygen blowing smelting), ordinary alloys and slag-forming materials are added to the ladle in a single step. The molten steel is then strongly stirred using argon gas. Simultaneously, oxygen is supplied to the molten steel through oxygen pipe 7 via a stacked oxygen supply cylinder 8. A drive motor 3 drives a drive gear 4, which in turn drives a driven gear 5. The driven gear 5 then drives a vertical pipe 6, which in turn rotates the actuating plate 9. Each rotation of the moving plate 9 acts on the floating rod 10, pressing it down. This causes the floating rod 10 to press down on the stacked oxygen supply cylinder 8, allowing it to extend and retract. The disc 13 floats up and down, disturbing the molten steel inside, thus allowing oxygen to be introduced into the molten steel more quickly for reaction. This accelerates the chemical reaction between calcium, aluminum, and titanium in the alloy and oxygen in the molten steel, causing them to float to the slag on the surface of the molten steel. At this time, the main disc 23 drives the turbulence plate 24 to rotate, guiding the slag in the molten steel towards the vortex disc 16. The servo motor 21 drives the upright rod 17 to rotate. During the rotation of the upright rod 17... The spiral blades 18 guide the scum upwards and into the sludge collection ball 20, achieving automated upward and outward discharge of the scum. The scum is then guided through the discharge pipe into the receiving funnel 38. The scum is then guided into the inner cavity 29. The drive motor 34 drives the rotating wheel 35 to rotate. During rotation, the rotating wheel 35 drives two sets of actuating blocks 36 to rotate synchronously, causing the actuating blocks 36 to act on two sets of crossbeams 37, causing the two sets of crossbeams 37 to move up and down respectively. The movement of the crossbeams 37 causes the connecting rod 27 to drive two sets of washboards 28 to move up and down along the adjusting groove 30. 28. The internal slag is crushed in a staggered manner and discharged externally to achieve efficient treatment of calcium, aluminum, and titanium contained in the alloy in the molten steel. At the same time, according to the oxygen content of the molten steel, 21-22 kg / t of high silicon manganese (containing 27% Si and 64% Mn), 6-8 kg / t of ferrosilicon, and 5-7 kg / t of lime are added. The first sample of the refining furnace is controlled at C≤0.05%, Si=0.85%-0.90%, and Mn=1.44%-1.49%. The bottom blowing argon flow rate of the ladle is controlled at 500-800 NL / min, and the time is controlled at 5-8 min.

[0030] Step 2: LF Refining Operation: Due to the low oxygen content in the molten steel during LF refining, it is necessary to add less or no alloying and use auxiliary materials for deoxidation. In addition, ferrosilicon powder is also used for deoxidation during the refining process, with the total amount controlled at 1-1.5 kg / t. The target final slag basicity is controlled at 1.5-1.9. For a small amount of alloying that needs to be added, low-titanium and low-aluminum ferrosilicon is used. It is forbidden to add calcium-containing auxiliary materials such as lime and silicon-calcium wire.

[0031] Step 3: Continuous casting operation: After refining, continuous casting is carried out. Continuous casting requires steel retention in the ladle to prevent calcium, aluminum and titanium oxides in the slag on the molten steel from entering the steel. The steel produced by this method has a calcium content of less than 4 ppm, an aluminum content of less than 30 ppm and a titanium content of less than 25 ppm.

[0032] Steps one through three are completed using a low-calcium, low-aluminum steel smelting production equipment. This equipment includes a ladle, a rotary drive assembly, a floating oxygen supply assembly, a purification guide mechanism, and an impurity treatment mechanism. The ladle includes a ladle body 1 and a mounting frame 2 installed on the upper part of the ladle body 1. The rotary drive assembly is vertically installed on the top of the mounting frame 2. The floating oxygen supply assembly is located below the mounting frame 2 and works in conjunction with the rotary drive assembly. The purification guide mechanism is built into the ladle body 1 and has a slag discharge pipe connected to its bottom. The slag discharge pipe passes through the mounting frame 2 and is connected to the impurity treatment mechanism, which is installed on the right side of the mounting frame 2.

[0033] Further improvements, such as Figure 1 As shown: The rotary drive assembly includes a drive motor 3, a drive gear 4, a driven gear 5, and a riser 6. The drive motor 3 is fixedly mounted on the mounting bracket 2 and its power output end is connected to the drive gear 4. The drive gear 4 meshes with the driven gear 5. The riser 6 passes vertically through the driven gear 5 and is fixedly connected to the driven gear 5. The riser 6 is used in conjunction with the floating oxygen supply assembly. The drive motor 3 drives the drive gear 4, and the drive gear 4 drives the driven gear 5 to rotate during rotation. The driven gear 5 drives the riser 6 to rotate synchronously.

[0034] Further improvements, such as Figure 2 As shown: The floating oxygen supply assembly includes an oxygen supply pipe 7, a stacked oxygen supply cylinder 8, a deflector plate 9, a floating rod 10, and a blade 11. The oxygen supply pipe 7 passes through the riser 6 and its lower end is connected to the stacked oxygen supply cylinder 8. The stacked oxygen supply cylinder 8 is located inside the ladle body 1. The deflector plate 9 is installed at the lower end of the riser 6 and is set at an angle. The floating rod 10 is inserted longitudinally into the stacked oxygen supply cylinder 8 and its lower end is fixedly connected to the bottom of the stacked oxygen supply cylinder 8. The floating rod 10 passes through the blade 11 and its upper end is fitted with a spring 12. The lower end of the spring 12 is in contact with the blade 11. The floating rod 10 works in conjunction with the deflector plate 9 to guide oxygen into the stacked oxygen supply cylinder 8 through the oxygen supply pipe 7 to supply oxygen to the molten steel. At the same time, the rotation of the deflector plate 9 causes the floating rod 10 to be pressed down once for each rotation, so that the floating rod 10 presses down on the stacked oxygen supply cylinder 8 for extension and retraction adjustment.

[0035] Further improvements, such as Figure 3As shown: The stacked oxygen supply cylinder 8 is composed of several sets of discs 13. The discs 13 are stacked in a stacked structure. Several sets of air guiding channels 14 are machined inside the discs 13. The outer ends of the air guiding channels 14 are connected to oxygen nozzles 15. The oxygen supply pipe 7 passes through the middle of the discs 13 and is connected to the air guiding channels 14. This design makes it easy for the discs 13 to float up and down and disturb the molten steel inside, so that oxygen can be introduced into the molten steel more quickly for reaction.

[0036] Further improvements, such as Figure 4 As shown: The impurity removal guiding mechanism includes a vortex plate 16, a vertical rod 17, spiral blades 18, an arc plate 19, a sludge collection ball 20, and a servo motor 21. The middle part of the vortex plate 16 is connected to the vertically arranged vertical rod 17. The spiral blades 18 are arranged in several groups and evenly installed on the vertical rod 17. The arc plate 19 is located on one side of the vertical rod 17. The upper end of the vertical rod 17 passes through the sludge collection ball 20. Blade 22 is installed below the sludge collection ball 20. Blade 22 is installed on the top of the ladle body 1. The servo motor 21 is installed on the top of the sludge collection ball 20 and its power output end is connected to the vertical rod 17. The servo motor 21 drives the vertical rod 17 to rotate. During the rotation of the vertical rod 17, the spiral blades 18 guide the scum upward and introduce it into the sludge collection ball 20, so as to achieve the purpose of automatically moving the scum upward and discharging it.

[0037] Further improvements, such as Figure 4 As shown: The swirl plate 16 includes a main plate 23 and several sets of baffles 24 fixed around the main plate 23. The baffles 24 are equidistantly distributed. The main plate 23 drives the baffles 24 to rotate, so that the slag in the molten steel is guided to the position of the swirl plate 16 and treated by the impurity removal and guiding mechanism.

[0038] Further improvements, such as Figure 1 , 5 As shown in Figure 6: The impurity treatment mechanism includes a receiving funnel 38, a guide plate 25, a driver 26, a connecting rod 27, and a rubbing plate 28. The lower end of the receiving funnel 38 is connected to the guide plate 25. The guide plate 25 has an inner cavity 29. Adjustment grooves 30 are machined on both sides of the inner cavity 29. The rubbing plate 28 is divided into two groups and is located in the two groups of adjustment grooves 30 respectively. Several sets of blades 31 are opened on the plate body of the rubbing plate 28. The upper end of the rubbing plate 28 is connected to the two sets of connecting rods 27. Floating grooves 32 are opened on both the left and right sides of the guide plate 25. Elastic gaskets 33 are built into the floating grooves 32. The upper end of the connecting rod 27 is located in the floating grooves 32 and is in contact with the elastic gaskets 33. The connecting rod 27 is used in conjunction with the driver 26. The receiving funnel 38 guides the introduced slag and introduces it into the inner cavity 29 for subsequent crushing processing.

[0039] Specifically, the driver 26 includes a drive motor 34, a rotating wheel 35, actuating blocks 36, and a crossbeam 37. The drive motor 34 is installed at the front end of the guide plate 25 and its power output end is connected to the rotating wheel 35. The actuating blocks 36 are divided into two sets and symmetrically installed on the rotating wheel 35. The actuating blocks 36 have an arc-shaped structure and contact the two sets of crossbeams 37. The crossbeams 37 are connected to the connecting rod 27. The installation position of the crossbeams 37 has a reserved groove to facilitate the up and down floating of the crossbeams 37. The drive motor 34 drives the rotating wheel 35 to rotate. During the rotation of the rotating wheel 35, the two sets of actuating blocks 36 rotate synchronously, so that the actuating blocks 36 act on the two sets of crossbeams 37, causing the two sets of crossbeams 37 to move up and down respectively. The movement of the crossbeams 37 causes the connecting rod 27 to drive the two sets of rubbing plates 28 to move up and down along the adjusting groove 30. The two sets of rubbing plates 28 perform staggered crushing of the internal material and discharge it.

[0040] In use: When oxygen needs to be supplied to molten steel, the oxygen is introduced into the stacked oxygen supply cylinder 8 through the oxygen supply pipe 7 for oxygen supply treatment. The drive motor 3 drives the drive gear 4, which in turn drives the driven gear 5. The driven gear 5 drives the riser 6 to rotate synchronously. During the rotation of the riser 6, the actuating plate 9 rotates. Each rotation of the actuating plate 9 acts on the floating rod 10, pressing it down. This causes the floating rod 10 to extend and retract, adjusting the stacked oxygen supply cylinder 8. The disc 13 floats up and down, disturbing the molten steel inside, thus allowing oxygen to be introduced into the molten steel more quickly for reaction. After the reaction, the resulting slag floats on the surface of the molten steel. The main disc 23 drives the turbulence plate 24 to rotate, guiding the slag in the molten steel towards the vortex disc 16. The servo motor 21 drives the upright 17 to rotate. During the rotation of the upright 17, the spiral blades 18 guide the scum upward and into the sludge collection ball 20, achieving the purpose of automatically moving and discharging the scum upward. The scum is then guided into the receiving funnel 38 through the scum discharge pipe. The scum is then guided into the inner cavity 29. The drive motor 34 drives the rotating wheel 35 to rotate. During the rotation of the rotating wheel 35, the two sets of actuating blocks 36 rotate synchronously, causing the actuating blocks 36 to act on the two sets of crossbeams 37, causing the two sets of crossbeams 37 to move up and down respectively. The movement of the crossbeams 37 causes the connecting rod 27 to drive the two sets of rubbing plates 28 to move up and down along the adjusting groove 30. The two sets of rubbing plates 28 perform staggered crushing of the scum inside and discharge it, achieving efficient treatment of the calcium, aluminum, and titanium contained in the alloy in the molten steel.

[0041] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0042] Furthermore, the terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as “first,” “second,” “third,” or “fourth” may explicitly or implicitly include at least one of those features.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A production equipment for smelting low-calcium, low-aluminum steel, characterized in that: The system includes a ladle, a rotary drive assembly, a floating oxygen supply assembly, a slag removal guide mechanism, and an impurity treatment mechanism. The ladle comprises a ladle body (1) and a mounting frame (2) installed on the upper end of the ladle body (1). The rotary drive assembly is vertically installed on the top of the mounting frame (2). The floating oxygen supply assembly is located below the mounting frame (2) and works in conjunction with the rotary drive assembly. The slag removal guide mechanism is built into the ladle body (1) and has a slag discharge pipe connected to its bottom. The slag discharge pipe passes through the mounting frame (2) and is connected to the impurity treatment mechanism. The impurity treatment mechanism is installed on the right side of the mounting frame (2). The rotary drive assembly includes a drive motor (3), a drive gear (4), a driven gear (5), and a riser (6). The drive motor (3) is fixed on the mounting frame (2), and its power output end is connected to the drive gear (4). The drive gear (4) meshes with the driven gear (5). The riser (6) passes vertically through the driven gear (5) and is fixedly connected to it. The riser (6) is used in conjunction with the floating oxygen supply assembly, which includes an oxygen delivery pipe. (7) A stacked oxygen supply cylinder (8), an actuating plate (9), a floating rod (10), and a blade (11). The oxygen supply pipe (7) passes through the riser (6) and its lower end is connected to the stacked oxygen supply cylinder (8). The stacked oxygen supply cylinder (8) is located inside the ladle body (1). The actuating plate (9) is installed at the lower end of the riser (6) and is set at an angle. The floating rod (10) is inserted longitudinally into the stacked oxygen supply cylinder (8) and its lower end is fixedly connected to the bottom of the stacked oxygen supply cylinder (8). The floating rod (10) passes through the blade (11) and A spring (12) is fitted at the upper end, and the lower end of the spring (12) is in contact with the blade (11). The floating rod (10) is used in conjunction with the actuating plate (9). The stacked oxygen supply cylinder (8) is composed of several sets of discs (13). The several sets of discs (13) are stacked. The interior of the disc (13) is formed with several sets of air guiding channels (14). The outer end of the air guiding channel (14) is connected to an oxygen outlet nozzle (15). The oxygen delivery pipe (7) passes through the middle of the disc (13) and is connected to the air guiding channel (14).

2. The production equipment for smelting low-calcium and low-aluminum steel according to claim 1, characterized in that: The impurity removal guiding mechanism includes a vortex disk (16), a vertical rod (17), a spiral blade (18), an arc plate (19), a sludge collection ball (20), and a servo motor (21). The middle part of the vortex disk (16) is connected to the vertically arranged vertical rod (17). The spiral blade (18) is divided into several groups and evenly installed on the vertical rod (17). The arc plate (19) is located on one side of the vertical rod (17). The upper end of the vertical rod (17) passes through the sludge collection ball (20). A second blade (22) is installed below the sludge collection ball (20). The second blade (22) is installed on the top of the ladle body (1). The servo motor (21) is installed on the top of the sludge collection ball (20), and its power output end is connected to the vertical rod (17).

3. The production equipment for smelting low-calcium and low-aluminum steel according to claim 2, characterized in that: The swirl disk (16) includes a main disk (23) and several sets of baffles (24) fixed around the main disk (23), with the baffles (24) distributed at equal intervals.

4. The production equipment for smelting low-calcium and low-aluminum steel according to claim 3, characterized in that: The impurity handling mechanism includes a receiving funnel (38), a guide plate (25), a driver (26), a connecting rod (27), and a rubbing plate (28). The lower end of the receiving funnel (38) is connected to the guide plate (25). The guide plate (25) has an inner cavity (29) formed inside. Adjustment grooves (30) are machined on both sides of the inner cavity (29). The rubbing plate (28) is divided into two groups and located in the two groups of adjustment grooves (30) respectively. The rubbing board (28) has several sets of blades (31) on its body. The upper end of the rubbing board (28) is connected to two sets of connecting rods (27). The guide plate (25) has floating grooves (32) on both the left and right sides. The floating grooves (32) have elastic pads (33) inside. The upper end of the connecting rods (27) is located in the floating grooves (32) and is in contact with the elastic pads (33). The connecting rods (27) are used in conjunction with the driver (26).

5. The production equipment for smelting low-calcium and low-aluminum steel according to claim 4, characterized in that: The driver (26) includes a drive motor (34), a rotating wheel (35), a toggle block (36), and a crossbeam (37). The drive motor (34) is installed at the front end of the guide plate (25) and its power output end is connected to the rotating wheel (35). The toggle block (36) is divided into two groups and symmetrically installed on the rotating wheel (35). The toggle block (36) has an arc-shaped structure and contacts the two groups of crossbeams (37). The crossbeam (37) is connected to the connecting rod (27).

6. A method for smelting low-calcium, low-aluminum steel using the production equipment described in any one of claims 1-5, characterized in that, The processing steps are as follows: Step 1: BOF Steelmaking Operation: Utilizing the high oxygen content in the molten steel produced during the BOF process (oxygen blowing smelting), common alloys and slag-forming materials are added to the ladle in a single step. Argon gas is used, and the molten steel is strongly stirred through a floating oxygen supply assembly and stacked oxygen supply cylinders. This accelerates the chemical reaction between the calcium, aluminum, and titanium in the alloys and the oxygen in the molten steel, causing them to float to the slag on the surface. At this time, the impurity removal and guiding mechanism and the impurity treatment mechanism work together to break up the slag and discharge it, achieving the desired effect of removing impurities from the molten steel. The calcium, aluminum, and titanium contained in the gold are treated efficiently. At the same time, according to the oxygen content of the molten steel, 21-22 kg / t of high-silicon manganese (containing 27% Si and 64% Mn), 6-8 kg / t of ferrosilicon, and 5-7 kg / t of lime are added. The first sample in the refining furnace is controlled at C≤0.05%, Si=0.85%-0.90%, and Mn=1.44%-1.49%. The bottom blowing argon flow rate of the ladle is controlled at 500-800 NL / min, and the time is controlled at 5-8 min. Step 2: LF Refining Operation: Due to the low oxygen content in the molten steel during LF refining, it is necessary to add less or no alloying and use auxiliary materials for deoxidation. In addition, ferrosilicon powder is also used for deoxidation during the refining process, with the total amount controlled at 1-1.5 kg / t. The target final slag basicity is controlled at 1.5-1.

9. For a small amount of alloying that needs to be added, low-titanium and low-aluminum ferrosilicon is used. It is forbidden to add calcium-containing auxiliary materials such as lime and silicon-calcium wire. Step 3: Continuous casting operation: After refining, continuous casting is carried out. Continuous casting requires steel retention in the ladle to prevent calcium, aluminum, and titanium oxides in the slag on the molten steel from entering the steel. Steel produced by this method has a calcium content of less than 4 ppm, an aluminum content of less than 30 ppm, and a titanium content of less than 25 ppm.

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