Converter coarse particle recovery and pollution prevention device and use method thereof

Abstract

The present invention belongs to the technical field of converter steelmaking wet dust removal process, and also relates to a converter coarse particle recovery and pollution prevention device. The present invention also relates to a method for using the converter coarse particle recovery and pollution prevention device. A plug-in plate (42) is inserted into a plug-in plate valve cavity (41) of a plug-in plate valve (4) at the lower part of a separation hopper (2), the lower part of the plate valve cavity (41) is connected to the upper part of a conveying pipe (8), a flexible filter belt (7) is arranged above the plug-in plate (42), an interception grid (5) is arranged at the lower part of an interception cavity (9) at the lower part of the conveying pipe (8), a sewage collection tank (10) is arranged at the bottom of the device frame (1), the sewage collection tank (10) is connected to a sewage collection pipeline (6), and a traction belt is arranged between the flexible fixing belt (7) and the plug-in plate valve (4). The converter coarse particle recovery and pollution prevention device described in the present invention and its method of use effectively prevent muddy water from polluting the on-site environment, completely solve the problem of dirty and messy recovery and transportation of converter coarse particles in wet dust removal, and have low recovery and pollution prevention costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of wet dust removal technology for converter steelmaking, and more specifically, relates to a converter coarse particle recovery and pollution prevention device. The present invention also relates to a method for using the converter coarse particle recovery and pollution prevention device. Background Art

[0002] Coarse granules from the converter steelmaking wet dust removal process are a byproduct of the converter steelmaking process and are high in iron. Recycling and reuse of these granules can significantly reduce production costs. Currently, steel mills typically process these granules into pelletized blocks, which are then fed through silos into the furnace for further smelting, reducing costs. Currently, these granules are recovered using a coarse granulation separator. After initial separation, the coarse granules typically contain 30% moisture. Due to the extremely small size of the coarse granules, with diameters in the micron range, and the limitations of current recycling equipment, the conventional recovery method involves dripping them through the coarse granulation separator's discharge pipe to the ground. Once a certain level of granules is reached, a loader is used to load them into transport trucks for transport to a processing center for processing and reuse. Another method involves installing an ash hopper at the recovery end of the coarse granulation separator, equipped with a valve, to collect the coarse granules initially and then release them for transportation based on the material level. However, due to the coarse particles' water content, fineness, and fluidity, all existing coarse particle recovery hopper valves cannot be designed to be completely sealed. Water must be able to flow out, otherwise the hopper will quickly fill up with the mud-water mixture, making periodic, efficient recovery impossible. Coarse particles containing water are highly fluid, flowing continuously through the gaps in the valves. This leaves the entire recovery area covered in coarse particles, creating a mess and a flood of sewage. When vehicles arrive to transport the particles, they are crushed and carried along by their wheels, leaving the entire site and road surface covered in coarse particles. Consequently, there is currently no clean system for coarse particle recovery and transportation, making it impossible to prevent on-site contamination and seriously out of step with current environmentally friendly, clean production requirements.

[0003] The patent document with authorization announcement number CN216473305U and authorization announcement date 2022.05.10 discloses a metal particle recovery device in a converter wet dust removal. The utility model relates to the field of steelmaking equipment, and in particular to a metal particle recovery device in a converter wet dust removal, including a sewage trough, a sedimentation tank, a coarse particle separator, a transfer silo, a ball mill unit, a dehydration unit, a magnetic separation unit and a packaging unit. The sewage trough is connected to the converter wet dust removal sewage, and the sewage trough is connected to the sedimentation tank. A coarse particle separator extending to the outside of the sedimentation tank is provided in the sedimentation tank. The outer end of the coarse particle separator is connected to the transfer silo. A transmission belt is provided between the transfer silo and the ball mill unit. The ball mill unit is connected to the dehydration unit. The dehydration unit includes a vibrating screen and a drum drying furnace. The vibrating screen and the drum drying furnace are connected by a transmission belt. The drum dryer is connected to a magnetic separator. The magnetic separator is connected to the packaging unit. The packaging unit includes a finished product silo. The lower end of the finished product silo is connected to a packaging machine. The utility model has the advantages of high metal material recovery rate and good economic benefits. Patent document CN2680329Y, dated February 23, 2005, discloses a coarse particle separation device. This utility model discloses a coarse particle separation device for wastewater treatment, and more particularly, a coarse particle separation device for treating converter steelmaking dust removal wash water. The device is characterized by comprising a coarse particle separator and a connected coarse particle separation tank; a coarse particle silo, and a support structure for the coarse particle separator. This device effectively reduces the load on sedimentation equipment, improves clarification efficiency, and provides high-quality dust removal water for the dust removal system. It also avoids sludge blockage in subsequent treatment units, reduces filter cloth damage in sludge dewatering equipment, and reduces thermal shutdowns. Furthermore, the coarse sludge does not require dewatering, allowing it to be directly transported to other locations. This device, however, has high economic and social benefits when used in converter systems. However, the coarse particle separator is directly connected to the downstream process, and the coarse particles are simply transported within the system without falling to the ground. This places extremely high demands on system design and does not meet the actual needs of most enterprises. The other is a simple coarse pelletizing system. None of the above mentioned technologies and methods involve effective separation and clean recovery of coarse pellets. They cannot guarantee true separation and clean recovery of converter coarse pellets. Therefore, existing devices cannot meet actual needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a converter coarse particle recovery and anti-pollution device with a simple structure is provided, which can effectively separate mud and water in the process of converter coarse particle recovery while effectively preventing mud and water from polluting the on-site environment, and completely solve the problem of dirty and messy recovery and transportation of converter coarse particles in wet dust removal, and has low recovery and anti-pollution costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0006] The present invention relates to a device for recovering coarse particles from a converter and for preventing pollution. A separation hopper is provided on a device frame, a connecting plug valve is provided at the lower part of the separation hopper, a plug plate is inserted into a plug valve cavity of the plug valve, the upper part of the plug valve cavity is connected to the separation hopper, the lower part of the plate valve cavity is connected to the upper part of a conveying pipe, a flexible filter belt is provided above the plug plate, the flexible filter belt is a cloth fabric, the lower part of the conveying pipe is connected to an interception cavity, an interception grid is provided at the lower part of the interception cavity, a sewage collection tank is provided at the bottom of the device frame, the interception grid is located above the sewage collection tank, the sewage collection tank is connected to the sewage collection pipeline, and a traction belt is provided between the flexible fixing belt and the plug valve.

[0007] A coarse particle conveyor is arranged obliquely on the upper part of the separation hopper, and a discharge port of the coarse particle conveyor is located at an upper position inside the separation hopper.

[0008] The gate of the gate valve is controlled by a control component, which is fixed outside the gate valve cavity. The control component is an electric cylinder, a pneumatic cylinder or a hydraulic cylinder.

[0009] The coarse particle conveyor further comprises a conveying body and a conveying screw.

[0010] The flexible filter belt is made of fiber cloth with a pore size of less than 60μ.

[0011] When the gate of the gate valve is closed and a flexible filter belt is arranged in the gate valve cavity above the gate, the muddy water in the separation hopper is configured to flow into the sewage collection tank through the gate valve and the intercepting grid.

[0012] When the gate of the gate valve is opened, the flexible filter belt arranged at the gate valve cavity position above the gate is configured to be able to fall to the position of the interception grid, and the coarse particles in the separation hopper are configured to be able to fall through the interception grid into the carriage of the transport vehicle below the separation hopper.

[0013] A vibration pump is installed at the lower part of the separation hopper, and the separation hopper is connected to the device frame through a shock-absorbing rubber block.

[0014] The present invention also relates to a method for using a converter coarse particle recovery and anti-pollution device with simple steps, which can effectively separate mud and water in the converter coarse particle recovery process while effectively preventing mud and water from polluting the on-site environment, completely solving the problem of dirty and messy recovery and transportation of converter coarse particles in wet dust removal, and has low recovery and anti-pollution costs.

[0015] The steps of using the converter coarse particle recovery and pollution prevention device are as follows:

[0016] S1. After the separation hopper and the gate valve are assembled, the flexible filter belt is arranged in the gate valve cavity above the gate inside the gate valve, and the flexible filter belt closes the gate valve cavity;

[0017] S2. After the water-containing coarse particles enter the separation hopper, they flow through the gate valve 4 and encounter the flexible filter belt. The flowing coarse particles are blocked by the flexible filter belt, and only water passes through the flexible filter belt. As the coarse particles continue to enter the separation hopper, the water is also continuously drained. Only dripping water is left in the sewage collection tank, and no coarse particles flow. At this stage, mud and water separation is achieved.

[0018] S3. After the coarse particles in the separation hopper are drained of moisture, when the discharge procedure is executed, the gate of the gate valve is opened, and the flexible filter belt falls together with the coarse particles. The coarse particles fall into the carriage through the interception grid. The flexible filter belt will not continue to fall with the coarse particles due to the presence of the traction belt. After the coarse particles in the separation hopper are emptied, the flexible filter belt is pulled back to the gate valve position for reuse.

[0019] When the flexible filter belt is corroded by water after long-term use or is broken and detached by the force of falling coarse particles, the interception grille will intercept the detached flexible filter belt, and the flexible filter belt will fall on the interception grille and will not enter the car with the coarse particles.

[0020] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0021] The novelty of the converter coarse particle recovery and pollution prevention device described in the present invention lies primarily in its improvements to the coarse particle recovery device, effectively achieving mud-water separation. This allows the water-containing coarse particles initially separated by the coarse particle machine to be drained in the mud-water separation hopper (separation hopper). When the flap is not opened, the coarse particles will not fall to the ground, effectively preventing water and converter coarse particles from falling and contaminating the site. The drained water is collected via a sewage collection trough and sewage collection pipeline on the ground. When the mud-water separation hopper is in the high position, the car is parked directly under the hopper, the flap is opened, and the vibrating pump is activated to unload the material, allowing the material to fall directly into the car compartment without any impact on the surrounding environment. After the discharge is completed, the vibrating pump is turned off, the flap is closed, and the flexible filter belt is replaced, allowing the next operation to proceed. This is efficient, convenient, clean, and environmentally friendly. The car's wheels also remain out of contact with the sludge, preventing coarse particles from being crushed by the wheels and following the vehicle's progress, impacting the road environment. The structure of the present invention improves the dryness of the coarse particles, providing a good foundation for subsequent processes. The moisture content of the coarse particles produced by this device has been measured to be less than 1%. The above device can be used at any site for collecting coarse particles from converter dust removal and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief description of the contents and symbols in the drawings of this specification:

[0023] Figure 1This is a schematic structural diagram of the converter coarse particle recovery and pollution prevention device according to the present invention;

[0024] The following are marked as follows: 1. Device frame; 2. Separation hopper; 3. Converter coarse particles; 4. Gate valve; 41. Gate valve cavity; 42. Gate; 5. Interception grid; 6. Sewage collection pipeline; 7. Flexible filter belt; 8. Conveying pipeline; 9. Interception cavity; 10. Sewage collection tank; 11. Coarse particle conveyor; 12. Discharge port; 13. Conveying body; 14. Conveying screw. DETAILED DESCRIPTION

[0025] The following describes the embodiments with reference to the accompanying drawings to further explain in detail the specific embodiments of the present invention, such as the shapes, structures, mutual positions and connection relationships between the various components involved, the functions and working principles of the various components.

[0026] As attached Figure 1As shown, the present invention is a converter coarse particle recovery and pollution prevention device. A separation hopper 2 is provided on the device frame 1. A connecting gate valve 4 is provided below the separation hopper 2. A gate valve 42 is inserted into the gate valve cavity 41 of the gate valve 4. The upper portion of the gate valve cavity 41 is connected to the separation hopper 2, and the lower portion of the gate valve cavity 41 is connected to the upper portion of the conveying pipe 8. A flexible filter belt 7 made of cloth is provided above the gate valve 42. The lower portion of the conveying pipe 8 is connected to the interception cavity 9. An interception grid 5 is provided below the interception cavity 9. A sewage collection trough 10 is provided at the bottom of the device frame 1. The interception grid 5 is located above the sewage collection trough 10. The sewage collection trough 10 is connected to the sewage collection pipeline 6. A traction belt is provided between the flexible fixing belt 7 and the gate valve 4. The above structure addresses the shortcomings of the existing technology and proposes an improved technical solution. The innovation of the above structure mainly lies in the improvement of the coarse particle recovery device, which effectively realizes the separation of mud and water, so that the water-containing coarse particles that have been initially separated by the coarse particle machine can be drained in the mud and water separation bucket (separation hopper 2), and the coarse particles will not flow to the ground when the plug plate 42 is not opened. While ensuring the reliable separation of mud and water, it effectively prevents water and converter coarse particles from falling and polluting the site. The drained water is collected through the sewage collection tank 10 and the sewage collection pipe 6 on the ground. When the mud and water separation bucket is at a high position, the car is parked directly under the separation hopper 2, the plug plate 42 is opened, and the vibration pump is turned on for unloading. The material falls directly into the car without any impact on the surrounding environment. After the discharge is completed, the vibration pump is turned off, the plug plate 42 is closed, and the flexible filter belt is re-placed, and the next operation can be carried out. It is efficient, convenient, clean and environmentally friendly. The wheels of the car transport cannot come into contact with the sludge, and there will be no situation where coarse particles are crushed by the wheels and follow the vehicle forward, affecting the environmental sanitation of the road surface. The structure of the present invention improves the dryness of coarse particles, providing a good foundation for subsequent processes. The moisture content of coarse particles obtained through this device is measured to be less than 1%. It can be used at any site where coarse particles from converter dust removal are collected, and has a wide range of applications. The converter coarse particle recovery and pollution prevention device described in the present invention has a simple structure. While effectively separating mud and water during the converter coarse particle recovery process, it effectively prevents mud and water from polluting the on-site environment, completely resolving the problem of dirty and messy recovery and transportation of converter coarse particles in wet dust removal, and also reduces the recovery and pollution prevention costs.

[0027] The coarse particle conveyor 11 is arranged obliquely on the upper part of the separation hopper 2, and the discharge port 12 of the coarse particle conveyor 11 is located above the separation hopper 2. In the above structure, the coarse particle conveyor 11 is used to transport coarse particles to ensure that the coarse particle materials enter the separation hopper.

[0028] The gate valve 4's gate 42 is controlled by a control unit fixed to the outside of the gate valve chamber 41. The control unit is an electric, pneumatic, or hydraulic cylinder. In this structure, the gate valve's gate is controlled by the control unit, and its movement relative to the gate valve chamber opens and closes the gate. When the gate is closed, a flexible filter belt 7 is positioned on the gate. Water within the coarse particles passes through the flexible filter belt and then through the gate, leaving the separation hopper. The coarse particles are blocked by the flexible filter belt and the gate, preventing them from falling out of the separation hopper, thus effectively preventing them from falling and contaminating the on-site environment. The remaining water enters the sewage collection tank 10 and is then drained through the sewage collection pipeline 6. This prevents the remaining water from contaminating the on-site environment. Consequently, neither the water nor the coarse particles affect the on-site environment.

[0029] The coarse particle conveyor 11 also includes a conveying body 13 and a conveying screw 14. In the above structure, the conveying screw 14 is connected to a motor, which is fixed to the conveying body. In this way, the motor controls the rotation of the conveying screw to convey the coarse particle material into the separation hopper.

[0030] The flexible filter belt 7 is constructed of fiber cloth with a pore size of less than 60μ. This structure prevents coarse particles from falling through without affecting the retention of water. This ensures that the water-containing coarse particles entering the separation hopper are reliably separated from the mud and water.

[0031] When the gate 42 of the gate valve 4 is closed and the flexible filter belt 7 is positioned above the gate valve cavity 41, the muddy water in the separation hopper 2 is configured to flow through the gate valve 4 and the interception grid 5 to the sewage collection tank 10. With this structure, when separating muddy water from water-containing coarse particles, the gate is closed and the flexible filter belt is positioned above the gate. The gate and the flexible filter belt cooperate to effectively block the coarse particles without affecting the flow of water.

[0032] When the gate 42 of the gate valve 4 is opened, the flexible filter belt 7, located within the gate valve cavity 41 above the gate 42, is configured to fall onto the interception grid 5. The coarse particles within the separation hopper 2 are then configured to pass through the interception grid 5 and fall into the transport vehicle below the separation hopper 2. With this structure, when the gate is opened, the flexible filter belt falls, but is blocked by the interception grid and prevents it from falling into the vehicle, while the coarse particles can fall into the vehicle. After the separated coarse particles are transported away, the flexible separation belt is replaced above the gate, and the gate is closed again, allowing the next batch of water-containing coarse particles to be separated again.

[0033] A vibration pump is installed at the lower part of the separation hopper 2, and the separation hopper 2 is connected to the device frame 1 through a shock-absorbing rubber block. With the above structure, when the vibration pump is started, the material discharge is effectively accelerated.

[0034] The present invention also relates to a method for using a converter coarse particle recovery and anti-pollution device with simple steps, which can effectively separate mud and water in the converter coarse particle recovery process while effectively preventing mud and water from polluting the on-site environment, completely solving the problem of dirty and messy recovery and transportation of converter coarse particles in wet dust removal, and has low recovery and anti-pollution costs.

[0035] The steps of using the converter coarse particle recovery and pollution prevention device are as follows:

[0036] S1. After the separation hopper 2 and the gate valve 4 are assembled, the flexible filter belt 7 is placed in the gate valve cavity 41 above the gate 42 inside the gate valve 4. The flexible filter belt 7 closes the gate valve cavity 41. S2. After the water-containing coarse particles enter the separation hopper 2, they encounter the flexible filter belt 7 when flowing through the gate valve 4. The flowing coarse particles are blocked by the flexible filter belt 7, and only water passes through the flexible filter belt 7. As the coarse particles continue to enter the separation hopper 2, the water is also continuously drained. Only dripping water remains in the sewage collection tank 10, with no coarse particles flowing. Mud and water separation is achieved at this stage. S3. After the coarse particles in the separation hopper 2 are drained, the discharge procedure is executed by opening the gate 42 of the gate valve 4. The flexible filter belt 7 falls along with the coarse particles, which then pass through the interception grille 5 and fall into the vehicle compartment. Due to the presence of the traction belt, the flexible filter belt 7 does not continue to fall with the coarse particles. After the coarse particles in the separation hopper 2 are emptied, the flexible filter belt 7 is pulled back to the gate valve 4 position and reused. If the flexible filter belt 7 is corroded by water after prolonged use or is pulled apart by the force of falling coarse particles, the interception grille 5 intercepts the detached flexible filter belt 7, which falls onto the interception grille 5 and does not enter the vehicle compartment with the coarse particles. The above steps provide a novel recovery and anti-pollution device and its use method. The mud and water separation device includes a separation hopper, a gate valve, a flexible filter belt, and an interception grille. The entire device is simple in principle and highly adaptable. The core technology of the present invention is the design and use of a flexible filter belt. After the separation hopper and the gate valve are assembled, a flexible filter belt must be arranged above the gate, so as to cover the position above the gate. In this way, when the coarse particles enter the hopper, the water flow in the coarse particles will continue to flow. If only a valve is used, the coarse particles will continue to flow to the ground along the gap with the water flow, causing environmental pollution. After using the solution of the present invention, when the water-containing coarse particles try to flow through the gate valve (valve), they encounter the flexible filter belt. The flowing coarse particle body will be effectively blocked by the flexible filter belt, and the flexible filter belt can only pass water. The coarse particles will be isolated, so that water molecules will penetrate through the flexible filter belt, leaving the coarse particles. In this way, while the water-containing coarse particles enter the hopper, the water is also continuously drained, and there is only dripping water but no flowing coarse particles on the ground. Effective mud and water separation is achieved at this stage. An interception grid is also installed under the hopper. When the discharge procedure is executed, the gate of the gate valve is opened, and the flexible filter belt falls with the coarse particles. The coarse particles fall smoothly into the carriage through the grid. The flexible filter belt will not continue to fall with the coarse particles due to the traction of the fixed end. After the material is discharged, the flexible filter belt is pulled back to its original position and reused. If the flexible filter belt is corroded by the dust removal water during long-term use or the force of the coarse particles is too strong to break and fall off, the flexible filter belt will break away from the traction of the fixed end. At this time, the interception grid will effectively intercept the detached filter belt, preventing the detached filter belt from entering the carriage and causing material blockage during transportation to the next process.When water drips from the separation hopper onto the ground, it is collected by a wastewater collection trough 10 and wastewater collection pipe 6 installed on the ground. The collected water can then be pumped into the sump of the dust removal system for recycling. This effectively prevents water from being discharged and particles from contaminating the ground during the entire coarse-particle mud-water separation process, achieving environmental protection.

[0037] The novelty of the converter coarse particle recovery and pollution prevention device described in the present invention lies primarily in its improvements to the coarse particle recovery device, effectively achieving mud-water separation. This allows the water-containing coarse particles initially separated by the coarse particle machine to be drained in the mud-water separation hopper (separation hopper). When the flap is not opened, the coarse particles will not fall to the ground, effectively preventing water and converter coarse particles from falling and contaminating the site. The drained water is collected via a sewage collection trough and sewage collection pipeline on the ground. When the mud-water separation hopper is in the high position, the car is parked directly under the hopper, the flap is opened, and the vibrating pump is activated to unload the material, allowing the material to fall directly into the car compartment without any impact on the surrounding environment. After the discharge is completed, the vibrating pump is turned off, the flap is closed, and the flexible filter belt is replaced, allowing the next operation to proceed. This is efficient, convenient, clean, and environmentally friendly. The car's wheels also remain out of contact with the sludge, preventing coarse particles from being crushed by the wheels and following the vehicle's progress, impacting the road environment. The structure of the present invention improves the dryness of the coarse particles, providing a good foundation for subsequent processes. The moisture content of the coarse particles produced by this device has been measured to be less than 1%. The above device can be used at any site for collecting coarse particles from converter dust removal and has a wide range of applications.

[0038] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A method for using a converter coarse particle recovery and pollution prevention device, characterized in that: A separation hopper (2) is provided on the device frame (1) of the converter coarse particle recovery and pollution prevention device, a connecting plug valve (4) is provided at the lower part of the separation hopper (2), a plug plate (42) is inserted into the plug valve cavity (41) of the plug valve (4), the upper part of the plug valve cavity (41) is connected to the separation hopper (2), the lower part of the plate valve cavity (41) is connected to the upper part of the conveying pipe (8), a flexible filter belt (7) is provided above the plug plate (42), the flexible filter belt (7) is a cloth fabric, the lower part of the conveying pipe (8) is connected to the interception cavity (9), an interception grid (5) is provided at the lower part of the interception cavity (9), a sewage collection tank (10) is provided at the bottom of the device frame (1), the interception grid (5) is located above the sewage collection tank (10), the sewage collection tank (10) is connected to the sewage collection pipeline (6), and a traction belt is provided between the flexible fixing belt (7) and the plug valve (4); The gate valve (4) of the gate valve (4) is controlled by a control component, which is fixed outside the gate valve cavity (41), and the control component is an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder; When the gate (42) of the gate valve (4) is closed and a flexible filter belt (7) is arranged in the gate valve cavity (41) above the gate (42), the muddy water in the separation hopper (2) is configured to flow into the sewage collection tank (10) through the gate valve (4) and the intercepting grid (5); The steps of using the converter coarse particle recovery and pollution prevention device are as follows: S1. After the separation hopper (2) and the gate valve (4) are assembled, the flexible filter belt (7) is arranged in the gate valve cavity (41) above the gate (42) inside the gate valve (4), and the flexible filter belt (7) closes the gate valve cavity (41); S2. After the water-containing coarse particles enter the separation hopper (2), they encounter the flexible filter belt (7) when flowing through the gate valve (4). The flowing coarse particles are blocked by the flexible filter belt (7), and only water passes through the flexible filter belt (7). While the coarse particles continue to enter the separation hopper (2), the water is also continuously drained. Only dripping water is left in the sewage collection tank (10), and no coarse particles flow. At this stage, mud and water separation is achieved. S3. After the coarse particles in the separation hopper (2) are drained, when the discharge procedure is executed, the plug plate (42) of the plug valve (4) is opened, and the flexible filter belt (7) falls down at the same time as the coarse particles. The coarse particles fall into the carriage through the interception grid (5). The flexible filter belt (7) will not continue to fall with the coarse particles due to the existence of the traction belt. After the coarse particles in the separation hopper (2) are emptied, the flexible filter belt (7) is pulled back to the position of the plug valve (4) for reuse.

2. The method for using the converter coarse particle recovery and pollution prevention device according to claim 1, characterized in that: A coarse particle conveyor (11) is arranged obliquely on the upper portion of the separation hopper (2), and a discharge port (12) of the coarse particle conveyor (11) is located at an upper position inside the separation hopper (2).

3. The method for using the converter coarse particle recovery and pollution prevention device according to claim 2, characterized in that: The coarse particle conveyor (11) further comprises a conveying body (13) and a conveying screw (14).

4. The method for using the converter coarse particle recovery and pollution prevention device according to claim 1 or 2, characterized in that: The flexible filter belt (7) is made of fiber cloth with a pore size of less than 60μ.

5. The method for using the converter coarse particle recovery and pollution prevention device according to claim 1 or 2, characterized in that: A vibration pump is installed at the lower part of the separation hopper (2), and the separation hopper (2) and the device frame (1) are connected via a shock-absorbing rubber block.

6. The method for using the converter coarse particle recovery and pollution prevention device according to claim 1 or 2, characterized in that: When the flexible filter belt (7) is corroded by water after long-term use or is pulled apart by the force of falling coarse particles, the interception grille (5) intercepts the detached flexible filter belt (7), and the flexible filter belt (7) falls on the interception grille (5) and does not enter the vehicle compartment along with the coarse particles.

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