De-phosphorization device and method for special stainless steel

Abstract

The application discloses a dephosphorization device and method for special stainless steel, and technical scheme points are as follows: a first hydraulic cylinder is started to drive a mounting block to move downwards, a second hydraulic cylinder is started to drive a lime box to move, the lime box moves horizontally in a reaction furnace, at this time, a valve is opened, and lime is laid on the bottom surface in the reaction furnace; a gas supply pump is started to extract oxygen in a gas storage groove, oxygen is injected into the reaction furnace, and part of the iron oxide skin can be added in the early melting stage and the dephosphorization stage to enhance the oxidizability of the slag; a feeding valve is opened, metal liquid enters the inside of the reaction furnace, a heater is started to heat the metal liquid, and dephosphorization operation is carried out; a temperature sensor is started to detect the temperature in the reaction furnace, the temperature in the dephosphorization slag flow stage is kept at about 1560 DEG C, and the dephosphorization effect is ensured; a driving motor is started, the driving motor drives a stirring rod to rotate, the molten iron is stirred, and the dephosphorization reaction is promoted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steelmaking, in particular to a special stainless steel dephosphorization device and method thereof. BACKGROUND

[0002] With the increasing demand of chemical industry, construction industry and people's daily life, the demand for stainless steel has increased dramatically, and the smelting process of stainless steel has also developed rapidly. At present, the main process of domestic traditional electric furnace stainless steel production is as follows: 1) electric furnace-AOD furnace-continuous casting two-step method; 2) electric furnace-AOD furnace-VOD furnace-continuous casting three-step method. The smelting raw material is ordinary scrap steel, stainless steel scrap and alloy.

[0003] For example, the Chinese patent with publication number CN207330977U proposes a molten iron tank molten iron dephosphorization pretreatment mixed top blowing device, which includes a top blowing gun, a lifting trolley, a CO2-O2 mixed control valve cabinet, a stainless steel pipe, a metal hose, a CO2 pipeline and an O2 pipeline, etc. The tail of the gun body of the top blowing gun is connected with the lifting trolley, and the top blowing gun and the lifting trolley are located directly above the molten iron tank; the CO2-O2 mixed control valve cabinet has two gas inlets connected with the CO2 pipeline and the O2 pipeline respectively, and the gas outlet of the CO2-O2 mixed control valve cabinet is connected with the top blowing gun through the stainless steel pipe and the metal hose. The advantage is that the molten iron tank molten iron dephosphorization end point carbon content is high, the molten iron over-oxidation is small, the iron evaporation amount is small, the iron loss is small, and the temperature regulation is flexible, but in this scheme, when dephosphorizing the stainless steel, lime needs to be added in the furnace to ensure the slag basicity and cover the molten steel. Artificially laying lime, the lime spreading efficiency is slow, which affects the processing efficiency. Therefore, we propose a special stainless steel dephosphorization device and method thereof. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a special stainless steel dephosphorization device and method thereof, which solves the problem that when dephosphorizing the stainless steel, lime needs to be added in the furnace to ensure the slag basicity and cover the molten steel. Artificially laying lime, the lime spreading efficiency is slow, which affects the processing efficiency.

[0005] A method for dephosphorizing a special stainless steel device, the specific steps are as follows:

[0006] Start the first hydraulic cylinder to drive the mounting block to move downward, and start the second hydraulic cylinder to push the lime box to move horizontally in the reaction furnace. At this time, open the valve to lay the lime on the inside bottom surface of the reaction furnace;

[0007] Start the gas supply pump to extract the oxygen in the gas storage tank, complete the injection of oxygen into the reaction furnace, and add part of the iron oxide scale in the early melting and dephosphorization stage to enhance the oxidation of the slag;

[0008] Open the feed valve to allow the molten metal to enter the reactor, start the heater to heat the molten metal, and carry out the dephosphorization operation;

[0009] The temperature sensor is activated to detect the temperature inside the reactor and control the temperature during the dephosphorization slag flow stage to maintain it at around 1560℃ to ensure the dephosphorization effect.

[0010] Start the drive motor, which drives the stirring rod to rotate, stirring the molten iron and promoting the dephosphorization reaction.

[0011] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0012] A dephosphorization device for special stainless steel includes: a reactor with an addition hole on its top surface, an inlet pipe fixedly installed inside the addition hole, a feed valve fixedly installed inside the inlet pipe, and a controller fixedly installed on one side of the reactor; a through hole on the top surface of the reactor, with a mounting bracket fixedly installed inside the through hole; an outlet hole on one side of the reactor, with a drain pipe fixedly installed inside the outlet hole, and a discharge valve fixedly installed inside the drain pipe; and a lime-laying assembly disposed inside one side of the mounting bracket for laying lime.

[0013] By adopting the above technical solution and setting up a lime-laying component, during use, workers can allow molten metal to enter the interior of the reactor through the liquid inlet pipe for dephosphorization processing. The lime-laying component lays lime on the bottom surface of the reactor interior to ensure the alkalinity of the slag and cover the molten steel, thus ensuring the dephosphorization effect, saving manpower, and improving the efficiency of lime spreading.

[0014] Preferably, the ash-spreading assembly includes: an adjusting groove, which is located on the inner top surface of the mounting frame, and a first hydraulic cylinder is fixedly installed inside the adjusting groove, with a mounting block fixedly installed at one end of the telescopic shaft of the first hydraulic cylinder; a pushing groove, which is located on one side inside the mounting block, and a second hydraulic cylinder is fixedly installed inside the pushing groove, with a lime box fixedly installed at one end of the telescopic shaft of the second hydraulic cylinder; and a plurality of ash-discharging holes, all of which are located on the inner bottom surface of the lime box, with an ash-discharging pipe fixedly installed inside each ash-discharging hole, and a valve fixedly installed inside each ash-discharging pipe.

[0015] By adopting the above technical solution, a first hydraulic cylinder is set up, and the installation block is moved downward into the interior of the reactor by the telescopic shaft of the first hydraulic cylinder. The lime box is moved horizontally inside the reactor by the telescopic shaft of the second hydraulic cylinder. By opening the valve, the lime inside the lime box is laid on the bottom surface of the reactor. This eliminates the need for manual laying, which is inefficient, thus improving laying efficiency and increasing processing efficiency.

[0016] Preferably, the lime spreading assembly further includes: a feeding hole, which is located on the top surface of the lime box, and a sealing cover is movably installed inside the feeding hole; and a fixing hole, which is located on one side of the mounting frame, and a baffle is movably installed inside the fixing hole.

[0017] By adopting the above technical solution, by setting a sealing cover, and by removing the baffle, the sealing cover can be removed by rotating it, making it convenient for workers to add lime into the lime box, thus improving its practicality.

[0018] Preferably, a heating groove is provided on the bottom surface of the reactor, and a heater is fixedly installed inside the heating groove. A temperature measuring hole is provided on the top surface of the reactor, and a temperature sensor is fixedly installed inside the temperature measuring hole.

[0019] By adopting the above technical solution, by setting up a heater, and by using a temperature sensor to monitor the temperature inside the reactor in real time, it is possible to ensure that the staff are aware of the temperature of the dephosphorized slag, and to maintain the temperature stability by heating the molten metal.

[0020] Preferably, a gas supply box is fixedly installed on the top surface of the reactor. The gas supply box has two gas storage tanks inside. Gas supply holes are opened on the left and right sides of the gas supply box. Two air inlets are opened on the top surface of the reactor. A gas supply pipe is fixedly installed inside the gas supply hole. One end of the gas supply pipe is fixedly installed inside the gas supply pipe. A gas supply pump is fixedly installed at one end of the gas supply pipe.

[0021] By adopting the above technical solution, by setting up a gas supply box, a certain amount of oxygen and carbon dioxide are stored in the gas storage tank respectively. The oxygen is filled into the gas supply pipe by the gas supply pump and then injected into the reactor through the gas supply pipe. This makes it convenient for the staff to control the amount of oxygen blown according to the Si content of the molten metal entering the furnace. Since the oxygen lance at the furnace door cannot supply oxygen into the furnace in the early stage of melting, some iron oxide scale can be added in the early stage of melting and the dephosphorization stage to enhance the oxidizability of the slag.

[0022] Preferably, a detection slot is provided on one side of the interior of the reactor, and a gas detector is fixedly installed inside the detection slot. An inflation hole is provided on the top surface of the gas supply box, and the inflation hole is connected to the gas storage tank. An inflation pipe is fixedly installed inside the inflation hole.

[0023] By adopting the above technical solution, by setting up a gas detector to monitor the gas content in the reactor, and by using a gas filling pipe to facilitate the replenishment of gas into the gas supply box by the staff.

[0024] Preferably, a stirring tank is provided on the top surface of the reactor, a drive motor is fixedly installed inside the stirring tank, a stirring rod is fixedly installed at one end of the drive shaft of the drive motor, and a material receiving trough is provided on one side of the reactor, with a door movably installed inside the material receiving trough.

[0025] By adopting the above technical solution, and by setting up a drive motor, the drive shaft of the drive motor rotates to drive the stirring rod to rotate, and the rotation of the stirring rod stirs and mixes the molten metal, thereby promoting the dephosphorization reaction and improving the reaction efficiency.

[0026] In summary, the present invention has the following main beneficial effects:

[0027] By setting up a first hydraulic cylinder, the mounting block is moved downwards into the interior of the reactor through the telescopic shaft of the first hydraulic cylinder. The lime box is moved horizontally inside the reactor through the telescopic shaft of the second hydraulic cylinder. By opening the valve, the lime inside the lime box is laid on the bottom surface of the reactor, eliminating the need for manual laying, which is inefficient and improves laying efficiency and processing efficiency.

[0028] By installing a sealing cover and removing the baffle, the sealing cover can be easily removed by rotating it, making it convenient for workers to add lime into the lime box, thus improving its practicality. By installing a heater and using a temperature sensor to monitor the temperature inside the reactor in real time, workers can ensure they are aware of the temperature of the dephosphorized slag. The heater also heats the molten metal, maintaining temperature stability.

[0029] By setting up an air supply box, a certain amount of oxygen and carbon dioxide are stored in the air storage tank. The oxygen is then pumped into the air supply pipe through the air supply pump and injected into the reactor through the air supply pipe. This allows the staff to control the amount of oxygen blown according to the Si content of the molten metal entering the furnace. Since the oxygen lance at the furnace door cannot supply oxygen into the furnace in the early stage of melting, some iron oxide scale can be added in the early stage of melting and the dephosphorization stage to enhance the oxidizability of the slag.

[0030] By installing a gas detector to monitor the gas content in the reactor, and by using a gas filling pipe to facilitate the replenishment of gas into the gas supply box, and by installing a drive motor, the rotation of the drive motor shaft drives the stirring rod to stir and mix the molten metal, thereby promoting the dephosphorization reaction and improving the reaction efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the method steps for a dephosphorization device for special stainless steel according to the present invention.

[0032] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0033] Figure 3 This is a schematic diagram of the disassembled structure of the mounting frame of the dephosphorization device for special stainless steel according to the present invention;

[0034] Figure 4 This is a schematic diagram of the mounting block structure of a dephosphorization device for special stainless steel according to the present invention;

[0035] Figure 5 This is a schematic diagram of the disassembled lime box structure of a dephosphorization device for special stainless steel according to the present invention.

[0036] Figure 6 This is a schematic diagram of the disassembled structure of the reactor of a special stainless steel dephosphorization device according to the present invention.

[0037] Figure 7 This is a schematic diagram of the disassembled structure of the air supply box of a special stainless steel dephosphorization device according to the present invention.

[0038] Reference numerals: 1. Reactor; 2. Addition hole; 3. Liquid inlet pipe; 4. Through hole; 5. Mounting bracket; 6. Liquid outlet hole; 7. Drain pipe; 8. Adjustment tank; 9. First hydraulic cylinder; 10. Mounting block; 11. Pushing tank; 12. Second hydraulic cylinder; 13. Lime box; 14. Ash outlet hole; 15. Ash outlet pipe; 16. Valve; 17. Feeding hole; 18. Sealing cover; 19. Fixing hole; 20. Baffle; 21. Heating tank; 22. Heater; 23. Temperature measuring hole; 24. Temperature sensor; 25. Stirring rod; 26. Gas supply box; 27. Gas storage tank; 28. Gas supply hole; 29. ​​Air inlet hole; 30. Gas supply pipe; 31. Detection tank; 32. Air filling hole; 33. Air filling pipe; 34. Stirring tank; 35. Drive motor. Detailed Implementation

[0039] 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.

[0040] Example 1

[0041] refer to Figures 1-7 A method for dephosphorizing a special type of stainless steel, the specific steps of which are as follows:

[0042] Start the first hydraulic cylinder 9 to drive the mounting block 10 to move downwards, start the second hydraulic cylinder 12 to push the lime box 13 to move horizontally in the reactor 1, and then open the valve to spread the lime on the bottom surface inside the reactor 1.

[0043] Start the gas supply pump to extract the oxygen from the gas storage tank 27 and complete the injection of oxygen into the reactor 1. Some iron oxide scale can be added in the early melting stage and the dephosphorization stage to enhance the oxidizing properties of the slag.

[0044] Open the feed valve to allow the molten metal to enter the interior of the reactor 1, start the heater 22 to heat the molten metal and carry out the dephosphorization operation;

[0045] Temperature sensor 24 is activated to detect the temperature inside reactor 1 and control the temperature of the dephosphorization slag flow stage to be maintained at around 1560℃ to ensure the dephosphorization effect.

[0046] Start the drive motor 35, which drives the stirring rod 25 to rotate, stirring the molten iron and promoting the dephosphorization reaction.

[0047] Example 2

[0048] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0049] refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 A dephosphorization device for special stainless steel adopts the following technical solution: A reactor 1 has an addition hole 2 on its top surface, an inlet pipe 3 is fixedly installed inside the addition hole 2, and a feed valve is fixedly installed inside the inlet pipe 3. A controller is fixedly installed on one side of the reactor 1. A through hole 4 is opened on the top surface of the reactor 1, and a mounting frame 5 is fixedly installed inside the through hole 4. An outlet hole 6 is opened on one side of the reactor 1, and a drain pipe 7 is fixedly installed inside the outlet hole 6. A discharge valve is fixedly installed inside the drain pipe 7. A lime-laying component is located inside one side of the mounting frame 5 and is used for laying lime. The lime-laying component includes an adjusting trough 8, which is located on the top surface inside the mounting frame 5. A controller is fixedly installed inside the adjusting trough 5. The system includes a first hydraulic cylinder 9, with a mounting block 10 fixedly installed at one end of the telescopic shaft of the first hydraulic cylinder 9. A pushing groove 11 is provided on one side of the interior of the mounting block 10. A second hydraulic cylinder 12 is fixedly installed inside the pushing groove 11. A lime box 13 is fixedly installed at one end of the telescopic shaft of the second hydraulic cylinder 12. Several ash outlet holes 14 are provided on the bottom surface of the interior of the lime box 13. An ash outlet pipe 15 is fixedly installed inside the ash outlet hole 14. A valve 16 is fixedly installed inside the ash outlet pipe 15. The ash spreading assembly also includes a feeding hole 17, which is located on the top surface of the lime box 13. A sealing cover 18 is movably installed inside the feeding hole 17. A fixing hole 19 is provided on one side of the mounting frame 5. A baffle 20 is movably installed inside the fixing hole 19.

[0050] Example 3

[0051] refer to Figure 2 andFigure 6 A heating tank 21 is provided on the bottom surface of the reactor 1. A heater 22 is fixedly installed inside the heating tank 21. A temperature measuring hole 23 is provided on the top surface of the reactor 1. A temperature sensor 24 is fixedly installed inside the temperature measuring hole 23.

[0052] Example 4

[0053] refer to Figure 2 , Figure 6 and Figure 7 A gas supply box 26 is fixedly installed on the top surface of the reactor 1. Two gas storage tanks 27 are opened inside the gas supply box 26. Gas supply holes 28 are opened on the left and right sides of the gas supply box 26. Two air inlets 29 are opened on the top surface of the reactor 1. A gas supply pipe 30 is fixedly installed inside the gas supply hole 28. One end of the gas supply pipe 30 is fixedly installed inside the gas supply pipe 30. A gas supply pump is fixedly installed at one end of the gas supply pipe 30. A detection slot 31 is opened on one side of the interior of the reactor 1. A gas detector is fixedly installed inside the detection slot 31. An air filling hole 32 is opened on the top surface of the gas supply box 26. The air filling hole 32 is connected to the gas storage tank 27. An air filling pipe 33 is fixedly installed inside the air filling hole 32.

[0054] Example 5

[0055] refer to Figure 2 and Figure 6 A stirring tank 34 is provided on the top surface inside the reactor 1. A drive motor 35 is fixedly installed inside the stirring tank 34. A stirring rod 25 is fixedly installed at one end of the drive shaft of the drive motor 35. A material receiving trough is provided on one side of the reactor 1. A box door is movably installed inside the material receiving trough.

[0056] Working principle: Please refer to Figures 1-7As shown, by setting up a first hydraulic cylinder 9, the installation block 10 is moved downwards into the interior of the reactor 1 by the telescopic shaft of the first hydraulic cylinder 9. The lime box 13 is moved horizontally inside the reactor 1 by the telescopic shaft of the second hydraulic cylinder 12. By opening the valve 16, the lime inside the lime box 13 is laid on the bottom surface of the reactor 1, eliminating the need for manual laying, which is inefficient and improves laying efficiency and processing efficiency. By setting up a sealing cover 18 and removing the baffle 20, the sealing cover 18 can be removed by rotating it, making it convenient for workers to add lime into the lime box 13, improving practicality. By setting up a heater 22 and using a temperature sensor 24 to monitor the temperature inside the reactor in real time, workers can know the temperature of the dephosphorized slag. The heater 22 is used to heat the molten metal. Heating is performed to maintain temperature stability. A gas supply box 26 is set up, and a certain amount of oxygen and carbon dioxide are stored in the gas storage tank 27. The oxygen is filled into the gas supply pipe 30 by the gas supply pump, and then injected into the reactor 1 through the gas supply pipe 30. This allows the staff to control the amount of oxygen blown according to the Si content of the molten metal entering the furnace. Since the oxygen lance at the furnace door cannot supply oxygen into the furnace in the early stage of melting, some iron oxide scale can be added in the early stage of melting and the dephosphorization stage to enhance the oxidizability of the slag. A gas detector is set up to monitor the gas content of the reactor 1. The gas filling pipe 33 allows the staff to replenish the gas into the gas supply box 26. A drive motor 35 is set up, and the drive shaft of the drive motor 35 drives the stirring rod 25 to rotate. The rotation of the stirring rod 25 stirs and mixes the molten metal, thereby promoting the dephosphorization reaction and improving the reaction efficiency.

[0057] 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 dephosphorization device for special stainless steel, characterized in that, include: A reactor (1) is provided with an addition hole (2) on its top surface. An inlet pipe (3) is fixedly installed inside the addition hole (2). A feed valve is fixedly installed inside the inlet pipe (3). A controller is fixedly installed on one side of the reactor (1). Through hole (4), the through hole (4) is opened on the top surface of the reactor (1), and a mounting bracket (5) is fixedly installed inside the through hole (4). Liquid outlet (6) is provided on one side of the reactor (1). A drain pipe (7) is fixedly installed inside the liquid outlet (6). A discharge valve is fixedly installed inside the drain pipe (7). A lime-laying assembly, disposed on one side inside the mounting frame (5), is used for laying lime; the lime-laying assembly includes: Adjustment groove (8), the adjustment groove (8) is opened on the inner top surface of the mounting frame (5), and a first hydraulic cylinder (9) is fixedly installed inside the adjustment groove (8), and a mounting block (10) is fixedly installed at one end of the telescopic shaft of the first hydraulic cylinder (9). Pushing groove (11), the pushing groove (11) is opened on one side of the inside of the mounting block (10), and a second hydraulic cylinder (12) is fixedly installed inside the pushing groove (11). A lime box (13) is fixedly installed at one end of the telescopic shaft of the second hydraulic cylinder (12). A plurality of ash outlet holes (14) are provided, and all of the plurality of ash outlet holes (14) are provided on the inner bottom surface of the lime box (13). An ash outlet pipe (15) is fixedly installed inside the ash outlet hole (14), and a valve (16) is fixedly installed inside the ash outlet pipe (15). The mortar-laying component also includes: Feeding hole (17) is opened on the top surface of the lime box (13), and a sealing cover (18) is movably installed inside the feeding hole (17). Fixing hole (19) is provided on one side of the mounting bracket (5), and a baffle (20) is movably installed inside the fixing hole (19).

2. The dephosphorization device for special stainless steel according to claim 1, characterized in that, The reactor (1) has a heating groove (21) on its inner bottom surface, and a heater (22) is fixedly installed inside the heating groove (21). The reactor (1) has a temperature measuring hole (23) on its top surface, and a temperature sensor (24) is fixedly installed inside the temperature measuring hole (23).

3. The dephosphorization device for special stainless steel according to claim 1, characterized in that, A gas supply box (26) is fixedly installed on the top surface of the reactor (1). Two gas storage tanks (27) are opened inside the gas supply box (26). Gas supply holes (28) are opened on the left and right sides of the gas supply box (26). Two air inlets (29) are opened on the top surface of the reactor (1). A gas supply pipe (30) is fixedly installed inside the gas supply hole (28). One end of the gas supply pipe (30) is fixedly installed inside the gas supply pipe (30). A gas supply pump is fixedly installed at one end of the gas supply pipe (30).

4. The dephosphorization device for special stainless steel according to claim 3, characterized in that, A detection slot (31) is provided on one side of the interior of the reactor (1). A gas detector is fixedly installed inside the detection slot (31). An air filling hole (32) is provided on the top surface of the gas supply box (26). The air filling hole (32) is connected to the gas storage tank (27). An air filling pipe (33) is fixedly installed inside the air filling hole (32).

5. The dephosphorization device for special stainless steel according to claim 1, characterized in that, The reactor (1) has a stirring tank (34) on its inner top surface. A drive motor (35) is fixedly installed inside the stirring tank (34). A stirring rod (25) is fixedly installed at one end of the drive shaft of the drive motor (35). A material taking trough is provided on one side of the reactor (1). A box door is movably installed inside the material taking trough.

6. The method of using the dephosphorization device for special stainless steel according to any one of claims 1-4, characterized in that: The specific steps are as follows: Start the first hydraulic cylinder (9) to drive the mounting block (10) to move, so that the mounting block (10) moves downward. Start the second hydraulic cylinder (12) to push the lime box (13) to move, so that the lime box (13) moves horizontally in the reactor (1). At this time, open the valve to spread the lime on the bottom surface inside the reactor (1). Start the gas supply pump, extract the oxygen inside the gas storage tank (27), and complete the injection of oxygen into the reactor (1). Add some iron oxide scale in the early melting stage and the de-P stage to enhance the oxidizing properties of the slag. Open the feed valve to allow the molten metal to enter the interior of the reactor (1), start the heater (22) to heat the molten metal and carry out the dephosphorization operation; Start the temperature sensor (24) to detect the temperature inside the reactor (1) and control the temperature of the dephosphorization slag stage to be kept at 1560℃ to ensure the dephosphorization effect; Start the drive motor (35), which drives the stirring rod (25) to rotate, stirring the molten iron and promoting the dephosphorization reaction.

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