RH furnace vacuum tank cold steel collecting device and using method

Abstract

The present application relates to a kind of RH furnace vacuum tank cold steel collecting device and use method, for collecting the cold steel slag of the outflow in vacuum tank, including moving trolley, spray cover and steel slag collection basin;The moving trolley is used to drive spray cover and steel slag collection basin move;The spray cover is set on moving trolley, and the opening of spray cover bottom is set, and the insertion hole of the immersion tube of the bottom of vacuum tank is opened in the top of spray cover, and the circumferential side wall of spray cover is uniformly distributed with multiple spray guns, and the spray gun is used to spray lime particle in spray cover;The steel slag collection basin is set on moving trolley, and steel slag collection basin is located in the inside of spray cover and opposite to the insertion hole.The present application preferably recycles molten liquid cold iron slag, reduces the complex process and waste of iron resource recycling, uses lime particle spray method, makes the fusion of iron oxide, gas and lime, for better recycling of iron resource, i.e. it provides better product for improving metallurgical reaction.

Description

Technical Field

[0001] This invention relates to the field of vacuum tank cold steel collection technology, specifically to a cold steel collection device and its usage method for an RH furnace vacuum tank. Background Technology

[0002] Due to persistent technical challenges in iron resource recycling, steel slag, cold steel, and other iron resources within steel plants are not being fully and effectively recycled, and some cold steel resources are difficult to process into the furnace. For example, in the RH furnace vacuum trough, the main container for steelmaking, molten steel easily splashes onto the inner wall during vacuum smelting, especially when smelting ultra-low carbon oxygen-containing steel. Over multiple heats, a significant amount of cold steel slag accumulates on the inner wall. Current technology typically involves blowing oxygen into the vacuum trough through a top lance to melt the cold steel slag, causing it to flow along the inner wall into the slag basin, forming a large, monolithic slag mass. However, this monolithic slag mass is difficult to directly recycle into the furnace, inconvenient to transport, and poses a high safety risk. Therefore, the research and development of a cold steel collection device and its application method is urgently needed. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a cold steel collection device and method for a vacuum trough in an RH furnace. It can effectively recover molten cold iron slag, reducing the complexity and waste of iron resource recycling. It provides a solution and technical method for iron resource reuse in the steel industry. Furthermore, by using a lime particle blowing method, it creates a fusion of iron oxide, gas, and lime, which provides a better product for iron resource recycling and utilization, thereby enhancing the metallurgical reaction.

[0004] The present invention is achieved through the following technical solution: a cold steel collection device for a vacuum tank of an RH furnace, used to collect cold steel slag flowing out of the vacuum tank, including a mobile trolley, a blower hood and a slag collection basin.

[0005] The mobile trolley is used to move the blowing hood and the steel slag collection basin. The blowing hood is mounted on the mobile trolley, with an opening at the bottom and an insertion hole at the top that matches the impregnation tube at the bottom of the vacuum tank. Multiple blowing guns are evenly distributed on the circumferential sidewalls of the blowing hood, and the blowing guns are used to blow lime particles into the blowing hood. The steel slag collection basin is mounted on the mobile trolley, located inside the blowing hood and opposite the insertion hole.

[0006] When the vacuum tank requires cooling steelmaking, this solution uses a mobile trolley to move the spray nozzle and slag collection basin below the vacuum tank. The molten steel slag flowing from the vacuum tank enters the spray nozzle, where lime particles are sprayed onto the slag through circumferential spray guns. These lime particles impact the slag, forming numerous tiny slag particles that fall into the collection basin. Compared to the existing technology's monolithic slag mixture, these slag particles are easier to decompose and recycle, and their transport is more convenient. Furthermore, the lime particle spraying method ensures thorough contact and fusion between the lime particles and the molten steel slag, generating a mixture of iron oxide, gas, and lime. This simplifies the subsequent refining of the slag particles and provides a better product for subsequent metallurgical reactions.

[0007] As an optimization, the mobile trolley is equipped with a hydraulic lifting system for driving the raising and lowering of the blow-off hood. This optimized solution uses a hydraulic lifting system to drive the raising and lowering of the blow-off hood, facilitating the connection of its insertion hole with the impregnation tube of the vacuum tank, making it convenient to use. When the impregnation tube is connected to the insertion hole, it prevents molten steel slag from splashing to the outside, ensuring the stability and safety of the operation process.

[0008] As an optimization, the hydraulic lifting system is a synchronous jack. This optimized solution uses a synchronous jack to provide stable support for the spray nozzle and ensure synchronization during lifting, thus maintaining the stability of the spray nozzle.

[0009] As an optimization, the blowing hood is detachably connected to the hydraulic lifting system. This optimization facilitates the disassembly of the blowing hood; after the operation is completed, the blowing hood can be removed, making it easier to take out the steel slag collection basin.

[0010] As an optimization, the input end of the jet gun is equipped with a flow control valve to control the jet flow rate and a pressure gauge to monitor the jet pressure. This optimization facilitates the monitoring and control of the jet volume of lime particles, ensuring that the lime particles can fully contact the liquid steel slag.

[0011] As an optimization, the nozzle of the blow gun is a Laval nozzle. This optimization can increase the compressed air jet velocity of the blow gun and improve the spray velocity of lime particles.

[0012] As an optimization, the inner wall of the spray nozzle is coated with a heat-resistant material. This optimization ensures the heat resistance of the spray nozzle.

[0013] The method of using the above-mentioned RH furnace vacuum tank cold steel collection device includes the following steps:

[0014] S1. When the vacuum tank is performing the steel cooling operation, the mobile trolley carrying the spray nozzle and slag collection basin moves to the bottom of the vacuum tank. The hydraulic lifting system pushes the spray nozzle up from the standby position to the working position, that is, the immersion tube at the bottom of the vacuum tank is inserted into the insertion hole at the top of the spray nozzle.

[0015] S2. The vacuum tank is used for melting and cooling steel. The top gun at the top of the vacuum tank blows oxygen into the vacuum tank to melt the cold steel in the tank, so that the molten and liquid steel slag flows out from the immersion pipe.

[0016] S3. The spray gun on the spray hood sprays lime particles into the spray hood, which come into contact with the dripping molten steel slag. The high-speed airflow carries the lime particles and instantly breaks up the molten steel slag flow, dispersing the molten steel slag flow into tiny droplets to form steel slag particles. The steel slag particles cool rapidly and fall into the steel slag collection basin below.

[0017] As an optimization, in step S3, the blowing pressure of the blasting gun is controlled at 1.5~2.0 MPa, and 85% of the blown lime particles have a diameter of 0.5~2 mm, while the remaining 15% have a maximum diameter of no more than 3 mm. This optimized scheme ensures sufficient contact between the lime particles and the liquid steel slag by controlling the proportion of lime particles.

[0018] As an optimization, the main components of the steel slag particles produced in step S3 include: 10-20% iron oxide + manganese oxide, 45-65% iron, 15-20% lime, and other oxides such as AlO3 and MgO. Under the blowing action of high-pressure gas, a highly oxidizing, gas-rich iron resource material with a certain alkalinity is produced, which provides a beneficial dephosphorizing agent for the dephosphorization treatment in the steelmaking converter process.

[0019] The beneficial effects of this invention are as follows: This invention utilizes oxidized iron resources in a molten state, injecting lime particles under high pressure to break up molten liquid steel slag, forming spherical steel slag particles that are easy to recycle and reuse directly. This method addresses the problem by combining the physical properties of iron resources to achieve a suitable state and reasonable composition of the iron resources, facilitating both iron resource recovery and improved steelmaking metallurgical reaction efficiency. It utilizes the phenomenon of liquid substances being broken into small particles by high-speed collisions and rapid cooling to form solid spherical particles, thus obtaining a more ideal state. By utilizing the iron resource form formed by RH furnace smelting of cold steel and combining it with a certain proportion of lime particles, under the action of high-pressure gas injection, a highly oxidizing iron resource substance rich in gas phase and containing a certain alkalinity is produced. This provides a beneficial dephosphorizing agent for the dephosphorization treatment in the steelmaking converter process, resulting in significant metallurgical effects and economic benefits in accelerating converter smelting efficiency and directly recycling iron resources. This technology can also be widely applied to the treatment of similar liquid steel slag iron resources. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] As shown in the figure:

[0022] 1. Vacuum tank; 2. Jacking pipe; 3. Mobile trolley; 4. Pulley hood; 5. Slag collection basin; 6. Pulley pipe; 7. Insertion port; 8. Pressure gauge; 9. Flow control valve; 10. Annular support plate; 11. Insertion sleeve; 12. Hydraulic jacking system; 13. Impregnation pipe. Detailed Implementation

[0023] This invention is applied in the steel industry, primarily concerning the recycling of cold steel slag accumulated on the inner wall of the vacuum tank 1 of an RH furnace, mainly targeting iron resources that are in a liquid or molten state. For the cold steel slag that has accumulated on the inner wall of the vacuum tank 1 of an RH furnace over a long period, existing technology typically involves fixing a vertical top lance 2 at the top of the vacuum tank 1. The top lance 2 is used to inject oxygen into the vacuum tank 1 to perform a cooling process. The oxygen reacts with the high-temperature cold steel, oxidizing the elements in the steel and releasing heat to melt the cold steel slag adhering to the inner wall of the vacuum tank 1. After melting, the cold steel slag flows directly along the inner wall of the vacuum tank 1 into the slag basin, forming a large, monolithic slag mass. Because large slag masses are difficult to directly reuse in the furnace, multiple processing steps such as cutting are required. Furthermore, the process of hoisting and transporting these slag masses is difficult and carries high safety risks, hindering the rapid recycling of iron resources.

[0024] This invention utilizes oxidized iron resources in a molten state, injecting lime particles under high pressure to break up molten liquid steel slag, forming spherical steel slag particles that are easy to recycle and reuse. This method addresses the problem by combining the physical properties of iron resources, aiming to obtain iron resources in a suitable state and with a reasonable composition. This achieves the dual purpose of facilitating iron resource recovery and improving the efficiency of steelmaking metallurgical reactions. It utilizes the phenomenon of liquid substances breaking into small particles under high-speed collisions and rapidly cooling them to form solid, spherical particles, thus obtaining a more ideal state of matter.

[0025] This invention starts with the phase composition of the iron resource itself, considers the practical application scenarios of the iron resource products, and analyzes the characteristics and existing problems of the steelmaking metallurgical reaction nodes, such as the slow slag formation rate and insufficient oxidizing power of the slag in the early stage of the converter. Utilizing the iron resource form formed by the melting of cold steel in an RH furnace, and combining it with a certain proportion of lime particles, under the action of high-pressure gas injection, a highly oxidizing iron resource substance rich in gas phase and containing a certain degree of alkalinity is produced, providing a beneficial dephosphorizing agent for the dephosphorization treatment in the steelmaking converter process. This yields significant metallurgical effects and economic benefits in accelerating converter smelting efficiency and directly recycling iron resources. This technology can also be extended to the treatment of similar liquid steel slag iron resources.

[0026] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0027] like Figure 1As shown, a cold steel collection device for a vacuum tank in an RH furnace is used to collect cold steel slag flowing out of the vacuum tank 1. The collection device includes a mobile trolley 3, a blower hood 4, and a slag collection basin 5.

[0028] The mobile trolley 3 is used to move the blow-off hood 4 and the steel slag collection basin 5. In this embodiment, the mobile trolley 3 can be electrically driven, manually driven, or an AGV heavy-duty vehicle, etc. There are no restrictions on the specific structure, as long as it can carry the blow-off hood 4 and the steel slag collection basin 5.

[0029] The blowing hood 4 is mounted on the mobile trolley 3. The bottom of the blowing hood 4 is open, and the top of the blowing hood 4 has an insertion hole 7 that matches the impregnation tube 13 at the bottom of the vacuum tank 1. Multiple blowing guns 6 are evenly distributed on the circumferential sidewalls of the blowing hood 4. The blowing guns 6 are used to blow lime particles into the blowing hood 4. In this embodiment, 85% of the blown lime particles have a diameter of 0.5~2mm, and the remaining 15% have a maximum diameter of no more than 3mm.

[0030] Specifically, in this embodiment, the spray nozzle 4 is a cylindrical structure with a closed top and an open bottom. The insertion hole 7 is located at the center of the top of the cylinder, and the number of insertion holes 7 is the same as the number of impregnation tubes 13 at the bottom of the vacuum tank 1. The inner wall of the spray nozzle 4 is coated with a heat-resistant material. The heat-resistant material can be a chromium-free refractory material, a low-cement or cement-free castable, ensuring the heat resistance of the spray nozzle 4 while being more environmentally friendly.

[0031] Specifically, the spray gun 6 is horizontally fixed to the upper part of the side wall of the spray hood 4, and the distance between the spray gun 6 and the top of the spray hood 4 is 10~15cm. The axes of multiple spray guns 6 intersect with the center line of the spray hood 4. In this embodiment, the spray gun 6 uses compressed air as the gas source, and the gas pressure is controlled at 1.5~2.0Mpa. The spray gun nozzle adopts a Laval nozzle design, thereby increasing the compressed air jet velocity and improving the spraying speed of lime particles. Each spray gun 6 is equipped with a flow control valve 9 to control the spraying flow rate and a pressure gauge 8 to monitor the spraying pressure, so as to facilitate monitoring and controlling the spraying volume and flow rate of lime particles, so that the lime particles can fully contact the liquid steel slag. In use, lime particles are fed into the gun barrel of the spray gun 6 from an external hopper, and a high-pressure airflow is provided to the spray gun 6 through an air compressor. The lime particles are blown and sprayed by the high-pressure airflow.

[0032] The mobile trolley 3 is equipped with a hydraulic lifting system 12 for driving the raising and lowering of the spray nozzle 4. The hydraulic lifting system 12 is used to drive the raising and lowering of the spray nozzle 4, so that its insertion hole 7 can be connected with the impregnation tube 13 of the vacuum tank 1. When the impregnation tube 13 is in place, the height of the lower end of the impregnation tube 13 should be higher than the height of the spray gun 6, so that the sprayed lime particles can come into contact with the flowing molten steel slag. Through the high-speed sprayed lime particles and the molten steel slag, the lime particles will fully and uniformly contact and fuse with the molten steel slag. After the lime particles come into contact with the molten steel slag, they will instantly break up and disperse the molten liquid flow into countless tiny droplets. At the same time, these tiny molten droplets react with the lime particles and coat the lime particles, eventually forming spherical steel slag particles.

[0033] Specifically, the hydraulic lifting system 12 is a synchronous jack, and the blow-off hood 4 is detachably connected to the hydraulic lifting system 12. In this embodiment, the synchronous jack uses a KET-SFP synchronous lifting hydraulic system from KENT. This synchronous jack is equipped with at least four jack components, which are evenly and vertically fixed to the top surface of the moving trolley 3. In this embodiment, an annular support plate 10 is fixed to the bottom of the blow-off hood 4. Multiple insertion sleeves 11 are evenly distributed and fixed to the bottom of the annular support plate 10, with the number of insertion sleeves 11 being the same as the number of jack components. During installation, the blow-off hood 4 can be lifted by hoisting, allowing the insertion sleeves 11 to be inserted and engaged with the telescopic shafts of the jack components, achieving a detachable connection. To ensure the stability of the engagement, the insertion sleeves 11 can be pinned to the telescopic shafts of the jack components. The spray nozzle 4 is raised and lowered stably by the synchronous extension and retraction of multiple jacks controlled by the synchronous jacks. The spray nozzle 4 is detachably connected to the jacks of the synchronous jacks for easy disassembly. After the operation is completed, the spray nozzle 4 can be removed, which makes it easier to take out the steel slag collection basin 5.

[0034] The steel slag collection basin 5 is mounted on the mobile trolley 3, located inside the blow-off hood 4 and opposite the insertion hole 7. Specifically, the steel slag collection basin 5 is detachably mounted on the mobile trolley 3 for easy removal and recovery of steel slag particles. In this embodiment, the steel slag collection basin 5 is placed on the mobile trolley 3, and a lifting ring is fixed to the outer wall of the steel slag collection basin 5, allowing it to be lifted for recovery of collected steel slag particles.

[0035] The method of using the above-mentioned RH furnace vacuum tank cold steel collection device includes the following steps:

[0036] S1. When the non-processing time of the vacuum tank 1 of the RH furnace is greater than 8 hours, a lot of cold steel slag has adhered to the inner wall of the vacuum tank 1. In order to prevent the cold steel slag from flowing out and blocking the impregnation tube 13 during the baking process, when the vacuum tank 1 needs to perform the cold steel operation, the mobile trolley 3 carries the blowing hood 4 and the steel slag collection basin 5 to the bottom of the vacuum tank 1. The hydraulic lifting system 12 pushes the blowing hood 4 to rise from the standby position to the working position. That is, the impregnation tube 13 at the bottom of the vacuum tank 1 is inserted into the insertion hole 7 at the upper end of the blowing hood 4, and the height of the blowing gun 6 is just at the lower end of the impregnation tube 13.

[0037] S2. Vacuum tank 1 is used for melting and cooling steel. The top gun 2 at the top of vacuum tank 1 blows oxygen into the vacuum tank 1 to melt the cold steel in the tank. The top gun 2 blows oxygen from top to bottom. The oxygen reacts with the high temperature cold steel, causing the elements in the steel to oxidize and release heat to melt the cold steel slag adhering to the inner wall of vacuum tank 1. The semi-molten and liquid steel, along with some steel slag, flows out from the immersion pipe 13. As the reaction rate proceeds, the amount of molten steel slag increases continuously, and the molten and liquid steel slag flows out from the immersion pipe 13.

[0038] S3. The spray gun 6 on the spray hood 4 sprays lime particles into the spray hood 4 and makes full contact with the dripping molten steel slag. The high-speed airflow carries the lime particles and instantly breaks up the molten steel slag liquid flow, causing the molten steel slag liquid flow to disperse into countless tiny droplets to form steel slag particles. The steel slag particles cool rapidly during the falling process and fall into the steel slag collection basin 5 below.

[0039] During the spraying process, the spraying pressure of the spray gun 6 is controlled at 1.5~2.0 MPa. 85% of the sprayed lime particles have a diameter of 0.5~2 mm, and the remaining 15% of the lime particles have a maximum diameter of no more than 3 mm.

[0040] Furthermore, when lime particles come into contact with molten steel slag, a reaction occurs to generate iron resource products with high oxidizing properties, rich in gas phase, and containing a certain degree of alkalinity. Specifically, the main components of the steel slag product include: 10-20% iron oxide + manganese oxide, 45-65% iron, 15-20% lime, and other oxides such as AlO3 and MgO. This steel slag product is mainly used for recycling in the converter oxidation environment and is beneficial for slag formation in the early stage of converter smelting, which is very beneficial for improving the slag formation rate and dephosphorization effect.

[0041] S4. When the cold tempering cleaning is carried out in the vacuum tank 1, the spray gun 6 is closed to stop spraying lime particles, the top gun 2 stops blowing oxygen at the same time, the hydraulic lifting system 12 drives the spray hood 4 to descend to the standby position, so that the impregnation tube 13 is separated from the insertion hole 7, and the moving trolley 3 is moved out.

[0042] S5. Lift out the blow-out hood 4, and then lift out the steel slag collection basin 5 to recover the collected steel slag particles for use in the converter.

[0043] Example 1:

[0044] The RH furnace has a processing capacity of 130 tons. Three blowing lances 6 are evenly arranged on the blowing hood 4. The vacuum tank 1 is used for steel cooling operations, and the top lance 2 blows oxygen at a rate of 200m³. 3 The gun position moves from the upper part to the lower part of the vacuum tank 1 to ensure that the vacuum tank 1 is cleaned by cold steel; at the same time, the spray gun of the spray hood 4 blows in lime particles under the high pressure of compressed air. The compressed air pressure is 1.5Mpa, and the lime particle diameter is required to be 0.5-2mm ≥85%, the rest <15%, and the maximum is no more than 3mm. The amount of lime particles blown in is adjusted according to the speed of the cold steel falling.

[0045] Judging from the iron particles in the steel slag collection basin 5, the RH furnace liquid steel slag treatment effect is good. The steel slag is a round small particle product with a diameter between 3 and 10 mm. The composition analysis of the steel slag particles shows that the main components are: iron oxide + manganese oxide content: 10-15%, iron content: 55-65%, lime content: 15-20%, and other components include some AlO3, MgO and other oxides.

[0046] Real-time example 2:

[0047] The RH furnace has a processing capacity of 200 tons. Four spray guns are evenly arranged in the spray hood 4. Vacuum tank 1 is used for steel cooling operations, and top lance 2 blows oxygen at a rate of 300m³. 3 The gun position moves from the top to the bottom of vacuum tank 1 to ensure that vacuum tank 1 is thoroughly cooled and hardened. At the same time, the steel cover spray gun blows in lime particles under the high pressure of compressed air. The compressed air pressure is 1.8 MPa. The lime particle diameter is required to be 0.5-2 mm ≥ 85%, the rest < 15%, and the maximum should not exceed 3 mm. The amount of lime particles blown in is adjusted according to the speed at which the cold steel falls.

[0048] Judging from the iron particles in the steel slag collection basin 5, the liquid steel slag in the vacuum tank 1 of the RH furnace has a good treatment effect. The steel slag is a small round particle product with a diameter between 3 and 10 mm. The composition analysis of the steel slag particles shows that the main components are: iron oxide + manganese oxide content: 15-20%, iron content: 45-55%, lime content: 15-20%, and other components include some oxides such as AlO3 and MgO.

[0049] In summary, the recycling of cold steel in the RH vacuum tank 1 using this invention is highly stable, efficient, and relatively simple to operate, fully realizing the efficient direct recycling of iron resources and improving the dephosphorization metallurgical efficiency of the converter. This technology integrates efficient oxidation and thermal melting of cold steel, the collision of liquid substances into small particles by high-pressure injection, and the utilization of iron resource morphology. A large amount of cold steel resources adhere to the inner wall of the RH furnace vacuum tank 1. Under normal processing conditions, the coupling of high-pressure injection of lime particles directly achieves the control of the physical phase morphology of iron resources, facilitating the direct digestion and utilization of iron resources in the steelmaking area. It also provides a larger reaction area and reaction rate for metallurgical reactions, increasing the mass transfer effect between steel and slag. In other words, this technology not only achieves rapid recycling of iron resources but also provides raw materials for promoting steelmaking metallurgical reactions, demonstrating good performance in both value creation and new technology innovation.

[0050] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A method for using a cold steel collection device for a vacuum tank in an RH furnace, used to collect cold steel slag flowing out of a vacuum tank (1), characterized in that: The collection device includes a mobile trolley (3), a blower hood (4), and a steel slag collection basin (5). The mobile trolley (3) is used to move the blow hood (4) and the slag collection basin (5); The blow hood (4) is mounted on a mobile trolley (3). The blow hood (4) has an opening at the bottom and an insertion hole (7) at the top that is compatible with the impregnation tube (13) at the bottom of the vacuum tank (1). Multiple blow guns (6) are evenly distributed on the circumferential sidewall of the blow hood (4). The blow guns (6) are used to blow lime particles into the blow hood (4). The steel slag collection basin (5) is set on the mobile trolley (3), and the steel slag collection basin (5) is located inside the blow hood (4) and opposite to the insertion hole (7); The method of use includes the following steps: S1. When the vacuum tank (1) is performing the cooling steel operation, the mobile trolley (3) carrying the blower hood (4) and the slag collection basin (5) runs to the bottom of the vacuum tank (1). The hydraulic lifting system (12) pushes the blower hood (4) to rise from the standby position to the working position, that is, the immersion tube (13) at the bottom of the vacuum tank (1) is inserted into the insertion hole (7) at the top of the blower hood (4). S2. The vacuum tank (1) is used for melting and cooling steel operation. The top gun (2) at the top of the vacuum tank (1) blows oxygen into the vacuum tank (1) to melt the cold steel in the tank, so that the molten and liquid steel slag flows out from the immersion pipe (13). S3. The spray gun (6) on the spray hood (4) sprays lime particles into the spray hood (4) and they come into contact with the dripping molten steel slag. The high-speed airflow carries the lime particles and instantly breaks up the molten steel slag liquid flow, causing the molten steel slag liquid flow to disperse into tiny droplets to form steel slag particles. The steel slag particles cool down quickly and fall into the steel slag collection basin (5) below. In step S3, the blowing pressure of the blowing gun (6) is controlled at 1.5~2.0 MPa. 85% of the blown lime particles have a diameter of 0.5~2 mm, and the remaining 15% of the lime particles have a maximum diameter of no more than 3 mm.

2. The method of using the cold steel collection device for the RH furnace vacuum tank 1 according to claim 1, characterized in that: The mobile trolley (3) is equipped with a hydraulic lifting system (12) for driving the spray nozzle (4) to rise and fall.

3. The method of using the RH furnace vacuum tank cold steel collection device according to claim 2, characterized in that: The hydraulic lifting system (12) is a synchronous jack.

4. The method of using the RH furnace vacuum tank cold steel collection device according to claim 3, characterized in that: The blow nozzle (4) is detachably connected to the hydraulic lifting system (12).

5. The method of using the RH furnace vacuum tank cold steel collection device according to claim 1, characterized in that: The input end of the blow gun (6) is equipped with a flow control valve (9) for controlling the blow flow rate and a pressure gauge (8) for monitoring the blow pressure.

6. The method of using the RH furnace vacuum tank cold steel collection device according to claim 1, characterized in that: The nozzle of the blow gun (6) is a Laval nozzle.

7. The method of using the RH furnace vacuum tank cold steel collection device according to claim 1, characterized in that: The inner wall of the blow nozzle (4) is coated with heat-resistant material.

8. The method of using the RH furnace vacuum tank cold steel collection device according to claim 1, characterized in that: The main components of the steel slag particles produced in step S3 include: 10-20% iron oxide and manganese oxide, 45-65% iron, 15-20% lime, and other oxides containing some AlO3 and MgO.

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