High-temperature steel slag graded cooling and crushing and f-CaO efficient digestion system

Abstract

The utility model discloses a high-temperature steel slag graded cooling and crushing and f-CaO efficient digestion system. Comprising a liquid slag tank, a first-stage wet cooling rolling crushing device, a second-stage closed dry cooling crushing device, a transfer slag tank for transferring steel slag between the first-stage wet cooling rolling crushing device and the second-stage closed dry cooling crushing device, a third-stage continuous conveying and atomizing cooling efficient digestion device, a cooling water closed circulating device and a control device, according to the utility model, different cooling and crushing devices and processes are adopted according to mineral decomposition and lattice transformation characteristics of the steel slag at different stages, and an original tank-type pressure hot disintegration device is not needed, so that the consumption of cooling water is effectively reduced, the crushing efficiency of the steel slag is greatly improved, the material grade of the crushed steel slag is smaller, and the production cost is reduced. The conversion rate of digestion of f-CaO in the steel slag is improved, and conditions are created for realizing waste heat recovery of the steel slag.

Description

Technical Field

[0001] This utility model relates to the field of steel slag treatment technology, specifically to a high-temperature steel slag graded cooling and crushing and f-CaO high-efficiency digestion system. Background Technology

[0002] Currently, the waste heat of steel slag is not efficiently recovered, and its mineral resource value is not well utilized due to limitations in steel slag treatment technology. Existing steel slag treatment processes, except for the air-quenching granulation process which does not use water, all employ full-process water spray cooling and crushing. Among these, the pressurized tank-type hot quenching process is carried out in a state of steel slag accumulation. Due to the lack of mechanical power to generate tumbling, collision, and crushing, the steel slag particles are relatively large during the treatment process. Although there is sufficient contact with water, the conversion rate of f-CaO digestion in the steel slag is low due to the small specific surface area of ​​the steel slag. Moreover, the batch f-CaO residue composition is very unstable, greatly affecting the comprehensive utilization rate of steel slag.

[0003] Among them, GB / T29514-2018 "Technical Specification for Steel Slag Treatment Process" requires that "the particle size of steel slag after hot quenching in a tank should be ≤20mm, accounting for more than 70%"; GB / T51387-2019 "Technical Standard for Steel Slag Treatment and Comprehensive Utilization" requires that "the content of particles smaller than 20mm in the steel slag after hot quenching should be greater than 60%" and requires that "for steel slag treated by pressurized hot quenching method, high-temperature steel slag above 500 degrees Celsius should not be sent into the pressurized hot quenching tank for hot quenching".

[0004] Chinese patent CN102230036A discloses a method for pressurized hot quenching of molten steel slag waste heat, which combines roller crushing and pressurized hot quenching processes to treat the steel slag. The description of the steel slag temperature and particle size is as follows: Roller crushing involves spraying water mist onto the surface of the molten steel slag in the pretreatment chamber for cooling, and then crushing it to a certain temperature and particle size using a roller crushing device. The certain temperature is 200-800℃, and the certain particle size is below 300mm. Chinese patent CN207362265U discloses a vertical pressurized hot quenching device for converter steel slag, which also uses a pressurized hot quenching process to treat the steel slag. The process effects of pressurized hot quenching are as follows: the entire vertical pressurized hot quenching treatment cycle for converter steel slag is only 1.5 to 2 hours; the pulverization rate (<20mm) of the steel slag after hot quenching is above 70%; and the free calcium oxide content of the stabilized steel slag is below 3%.

[0005] It is evident that in the current steel slag processing, the steel slag material with larger particle size during the f-CaO digestion reaction after being treated by the pressurized hot quenching process is relatively large. Moreover, the pressurized hot quenching process has staged requirements on the temperature of the steel slag, which limits the pressurized hot quenching time. The cooling water consumption is large throughout the entire process, and the conversion rate of f-CaO digestion reaction in the steel slag is low. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a high-temperature steel slag graded cooling crushing and f-CaO high-efficiency digestion system, which can solve the problems mentioned in the background art of large cooling water consumption, large steel slag material size, and low steel slag digestion conversion rate in the steel slag treatment process.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0008] A high-temperature steel slag grading cooling crushing and f-CaO high-efficiency digestion system includes a liquid slag tank, a primary wet cooling roller crushing device, a secondary closed dry cooling crushing device, a transfer slag tank for transferring steel slag between the primary wet cooling roller crushing device and the secondary closed dry cooling crushing device, a tertiary continuous conveying and atomizing cooling high-efficiency digestion device, a closed-loop cooling water circulation device, and a control device. The liquid slag tank is located above the inlet of the primary wet cooling roller crushing device, the steel slag temperature control device is located below the primary wet cooling roller crushing device, the closed-loop cooling water circulation device is connected to the secondary closed dry cooling crushing device, and the tertiary continuous conveying and atomizing cooling high-efficiency digestion device is located below the outlet of the secondary closed dry cooling crushing device. The primary wet cooling roller crushing device, the secondary closed dry cooling crushing device, the tertiary continuous conveying and atomizing cooling high-efficiency digestion device, and the closed-loop cooling water circulation device are all electrically connected to the control device.

[0009] The above-mentioned high-temperature steel slag graded cooling crushing and f-CaO high-efficiency digestion system includes a steel slag temperature control device installed at the lower part of the first-stage wet cooling roller crushing device, with the output end of the steel slag temperature control device connected to the input end of the control device.

[0010] In the above-mentioned high-temperature steel slag graded cooling and crushing and f-CaO high-efficiency digestion system, a conveying weight control device is provided above the feed inlet of the secondary closed dry cooling and crushing device, and the conveying weight control device is electrically connected to the control device.

[0011] The above-mentioned high-temperature steel slag grading, cooling, crushing, and f-CaO high-efficiency digestion system includes a conveying weight control device comprising a vibrating feeder, a weight sensor mounted on the vibrating feeder, the controlled end of the vibrating feeder being connected to the controlled end of the control device, and the output end of the weight sensor being connected to the input end of the control device.

[0012] The above-mentioned high-temperature steel slag graded cooling and crushing and f-CaO high-efficiency digestion system includes a secondary closed dry cooling and crushing device, which is a drum slag cooler. The drum slag cooler has a membrane wall structure and a spiral stirring composite crushing component is installed inside the drum slag cooler.

[0013] The aforementioned high-temperature steel slag grading cooling crushing and f-CaO high-efficiency digestion system includes a spiral stirring composite crushing component comprising a guide plate and a shaped stirring rod disposed on a water-cooled pipe in a membrane wall structure, with the guide plate and the shaped stirring rod disposed at intervals. The guide plate is distributed in a spiral structure along the discharge direction of the cylinder, and the guide plate is a straight plate structure with its radial height gradually increasing in three stages along the discharge direction. The shaped stirring rod is disposed in the front half of the feed side of the drum and includes a base and a rod head. The rod head located in the front section of the feed inside the drum is a spherical rod head, and the rod head located in the rear section of the feed inside the drum is a cylindrical rod head.

[0014] The aforementioned high-temperature steel slag grading, cooling, crushing, and f-CaO high-efficiency digestion system includes a three-stage continuous conveying and atomizing cooling high-efficiency digestion device comprising a buffer bin, a cylindrical feeder, an aerosol spray gun, a humidifying spray gun, and a belt conveyor. The buffer bin has a material gate at its bottom, with the controlled end of the gate connected to the output end of a control device. The cylindrical feeder is positioned below the buffer bin, and the belt conveyor is positioned below the cylindrical feeder. A downwardly inclined bar screen is positioned on the outside of the cylindrical feeder, with the aerosol spray guns positioned above and below the bar screen. The humidifying spray gun is positioned above the belt conveyor.

[0015] The above-mentioned high-temperature steel slag graded cooling crushing and f-CaO high-efficiency digestion system has a material level detection device installed on the top of the buffer bin, and the output end of the material level detection device is connected to the input end of the control device.

[0016] In the above-mentioned high-temperature steel slag graded cooling crushing and f-CaO high-efficiency digestion system, a steel slag temperature detection device is installed above the discharge end of the belt conveyor, and the output end of the steel slag temperature detection device is connected to the input end of the control device.

[0017] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0018] This invention provides a high-temperature steel slag graded cooling and crushing and f-CaO high-efficiency digestion system. Different cooling and crushing devices and processes are adopted according to the mineral decomposition and lattice transformation characteristics of steel slag at different stages. It eliminates the need for the original pressurized tank heat treatment device, effectively reduces the consumption of cooling water, and significantly improves the crushing efficiency of steel slag. The crushed steel slag material is smaller in size, which improves the conversion rate of f-CaO digestion in steel slag and creates conditions for realizing the recovery of waste heat from steel slag.

[0019] Specifically, the liquid steel slag is first converted into solid high-temperature steel slag using a primary wet cooling and crushing device, while simultaneously undergoing preliminary cooling and crushing. Next, a secondary closed dry cooling and crushing device further cools and crushes the steel slag to obtain fine-particle, low-temperature steel slag. This operation utilizes a membrane wall structure to cool the steel slag, effectively absorbing residual heat. Then, a three-stage continuous conveying and atomizing cooling high-efficiency digestion device allows the steel slag to fully react with water, accelerating the digestion of f-CaO and improving the conversion rate. The steel slag produced after these three stages is significantly smaller than that produced by the current pressurized hot quenching process. Furthermore, the multi-stage cooling process ultimately reduces the steel slag temperature to 50-100℃. Because the steel slag is crushed into fine particles in the secondary closed dry cooling and crushing device, it facilitates a full reaction between the steel slag and water, accelerating the digestion of f-CaO and greatly improving the batch homogeneity of the residual f-CaO components. This enhances the conversion rate of the steel slag digestion reaction and the overall utilization rate of the steel slag. Attached Figure Description

[0020] Figure 1 This is a detailed process flow diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the specific structure of the infeed section inside the drum slag cooler of this utility model;

[0022] Figure 3 This is a schematic diagram of the specific structure of the internal feeding section of the drum slag cooler described in this utility model;

[0023] Figure 4 This is a schematic diagram of the specific structure of the three-stage continuous conveying and atomization cooling high-efficiency digestion device described in this utility model.

[0024] The components include: 1. Liquid slag jar, 2. Primary wet cooling roller crushing device, 3. Steel slag temperature control device, 4. Transfer slag jar, 5. Conveying weight control device, 6. Secondary closed dry cooling crushing device, 7. Tertiary continuous conveying and atomizing cooling high-efficiency digestion device, 8. Cooling water closed circulation device, 9. Water cooling pipe, 10. Guide plate, 11. Base, 12. Spherical rod head, 13. Cylindrical rod head, 14. Material surface detection device, 15. Buffer bin, 16. Material gate, 17. Cylindrical feeder, 18. Aerosol spray gun, 19. Bar screen, 20. Humidifying spray gun, 21. Steel slag temperature detection device, and 22. Belt conveyor. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] A high-temperature steel slag staged cooling and crushing system with efficient f-CaO digestion, such as Figures 1 to 4 As shown, it includes a liquid slag jar 1, a primary wet cooling roller crushing device 2, a steel slag temperature control device 3, a transfer slag jar 4, a conveying weight control device 5, a secondary closed dry cooling crushing device 6, a tertiary continuous conveying and atomizing cooling high-efficiency digestion device 7, a cooling water closed circulation device 8, and a control device.

[0027] The liquid slag tank 1 is connected to the primary wet cooling roller crushing device 2 and is used to transport liquid high-temperature steel slag into the primary wet cooling roller crushing device. Specifically, the liquid slag tank 1 is transported by an overhead crane and, after being overturned, the liquid steel slag is poured into the primary wet cooling roller crushing device 2.

[0028] The primary wet cooling roller crushing device 2 is used to pre-treat liquid steel slag, achieving preliminary cooling and crushing of the steel slag. The controlled end of the primary wet cooling roller crushing device 2 is connected to the output end of the control device.

[0029] The primary wet cooling roller crushing device 2 includes a spray cooler and a crushing component. The spray cooler is used to cool the liquid steel slag to form solid high-temperature steel slag, which facilitates the crushing component to perform preliminary crushing on the cooled solid steel slag.

[0030] The steel slag temperature control device 3 is installed at the lower part of the first-stage wet cooling roller crushing device 2 to control the temperature of the processed steel slag. The output end of the steel slag temperature control device 3 is connected to the input end of the control device.

[0031] Specifically, the steel slag temperature control device 3 is an infrared temperature sensor for measuring the temperature of the steel slag. The steel slag is sprayed and cooled by the primary wet cooling roller crushing device 2, and the infrared temperature sensor is used to measure the temperature of the steel slag. This ensures that the liquid steel slag is transformed into solid high-temperature steel slag after being processed by the primary wet cooling roller crushing device 2. The temperature of the processed high-temperature steel slag is controlled at 800-900℃, and the particle size of the processed steel slag is less than 300mm, with particles smaller than 80mm accounting for more than 80%.

[0032] The intermediate slag hopper 4 is located between the primary wet cooling roller crushing device 2 and the secondary closed dry cooling crushing device 6. The intermediate slag hopper 4 mainly uses an overhead crane to transfer the steel slag that has been preliminarily processed by the primary wet cooling roller crushing device 2 to the secondary closed dry cooling crushing device 6 for further processing.

[0033] The conveying weight control device 5 is installed above the feed inlet of the secondary closed dry cooling crushing device 6. The conveying weight control device 5 includes a vibrating feeder, on which a weight sensor is installed. The controlled end of the vibrating feeder is connected to the controlled end of the control device, and the output end of the weight sensor is connected to the input end of the control device.

[0034] Specifically, the weight sensor collects material weight data in real time and transmits it to the control device. The control device compares the actual weight with the preset value and calculates the feed rate or amplitude that needs to be adjusted through the algorithm. It then dynamically adjusts the vibration frequency or motor speed to precisely control the feed rate.

[0035] The secondary closed dry cooling and crushing device 6 includes a drum slag cooler. The drum slag cooler has a membrane wall structure and a spiral stirring compound crushing component is installed inside the drum.

[0036] The closed-loop cooling water circulation device 8 is connected to the membrane wall structure and is used to cool the slag inside the drum.

[0037] The spiral stirring composite crushing component includes a guide plate 10 and an irregularly shaped stirring rod disposed on the water-cooled pipe 9 in the membrane wall structure. The guide plate 10 and the irregularly shaped stirring rod are arranged at intervals. The guide plate 10 is distributed in a spiral structure along the discharge direction of the cylinder. The guide plate 10 is a straight plate structure, and its height changes in three stages along the discharge direction, gradually increasing to realize the turning and propulsion of steel slag.

[0038] The irregularly shaped stirring rod is located in the front half of the feed side of the drum, including a base 11 and a rod head. The rod head is detachably connected to the top of the base for easy replacement. The base 11 has a trapezoidal structure and is fixedly connected to the water cooling pipe parallel to the drum axis.

[0039] The rod head is made of heat-resistant and wear-resistant cast steel. The rod head located in the front section of the feed inside the drum is a spherical rod head 12, and the rod head located in the rear section of the feed inside the drum is a cylindrical rod head 13. The steel slag is stirred by the irregularly shaped stirring rod, which realizes the efficient crushing of the steel slag and avoids material jamming.

[0040] The secondary closed dry cooling and crushing device 6 uses a drum slag cooler to cool the steel slag in a rotary manner. Inside the drum, there is a spiral stirring composite crushing component consisting of spirally arranged guide plates 10 and irregularly shaped stirring rods. The drum speed is interlocked with the feed rate and discharge temperature through frequency conversion speed regulation, so as to complete the crushing process of steel slag to obtain fine-particle low-temperature steel slag. The temperature of the processed fine-particle low-temperature steel slag is 200-300℃, and the proportion of particles smaller than 8mm in the steel slag is greater than 90%.

[0041] The three-stage continuous conveying and atomizing cooling high-efficiency digestion device 7 is located below the discharge port of the two-stage closed dry cooling crushing device 6 and is used to receive the fine-particle low-temperature steel slag after the two-stage treatment.

[0042] The three-stage continuous conveying and atomizing cooling high-efficiency digestion device 7 includes a buffer bin 15, a cylindrical feeder 17, an aerosol spray gun 18, a humidifying spray gun 20, and a belt conveyor 22. The bottom of the buffer bin 15 is provided with a material gate 16, and the controlled end of the material gate 16 is connected to the output end of the control device. The cylindrical feeder 17 is located below the buffer bin 15, and the belt conveyor 22 is located below the cylindrical feeder 17.

[0043] The buffer bin 15 is equipped with a material level detection device 14 at the top. The output end of the material level detection device 14 is connected to the input end of the control device and is used to detect the material height in the buffer bin 15.

[0044] A downwardly inclined bar screen 19 is provided on the outer side of the cylindrical feeder 17. Aerosol spray guns 18 are respectively set above and below the bar screen 19 to cool the material falling on the bar screen. At the same time, the aerosol spray guns work together to make the material and water mix thoroughly and accelerate the digestion of the material. In this process, the temperature of the steel slag is cooled to 100-200℃.

[0045] Two spaced-apart humidifying spray guns 20 are installed above the belt conveyor 22 to further cool the material. The temperature of the cooled steel slag is 50-100℃ after humidification and cooling.

[0046] A steel slag temperature detection device 21 is installed above the discharge end of the belt conveyor 22, and the output end of the steel slag temperature detection device 21 is connected to the input end of the control device.

[0047] The operation steps of this utility model are as follows:

[0048] First, the high-temperature liquid slag in the liquid slag tank 1 is poured into the primary wet cooling roller crushing device 2 by the overhead crane to cool the liquid steel slag to a solid state. Then, the steel slag is initially crushed by the crushing components.

[0049] The steel slag temperature control device 3 at the bottom of the primary wet cooling roller crushing device 2 detects the temperature of the processed steel slag. After reaching the appropriate temperature, the solid high-temperature steel slag is discharged into the transfer slag tank 4. The transfer slag tank 4 containing the solid high-temperature steel slag is transported to the upper part of the secondary closed dry cooling crushing device 6 by an overhead crane, and the processed solid high-temperature steel slag is transferred into the secondary closed dry cooling crushing device 6.

[0050] Next, the secondary closed dry cooling and crushing device 6 further cools and crushes the steel slag through a drum slag cooler to obtain fine-particle low-temperature steel slag.

[0051] Fine-grained low-temperature steel slag is conveyed into the buffer silo 15 and discharged into the cylindrical feeder 17 through the material gate 16. After being processed by the cylindrical feeder, the steel slag is output as a material curtain with a certain width, and then falls onto the bar screen to screen the large particles in the steel slag. At the same time, the air mist spray gun cools the fine-grained steel slag on the bar screen, so that the water and the material are fully mixed and the material is accelerated to digest.

[0052] During this process, the material level in the buffer bin is monitored in real time by the material level detection device 14 so as to adjust the water spray volume to match the temperature of the steel slag in the buffer bin and the rotation speed of the cylindrical feeder, thereby accelerating the cooling of the steel slag.

[0053] After screening, the large pieces of steel slag fall onto the belt conveyor 22 and are cooled again by the humidifying spray gun above the belt conveyor. Then, they are output through the discharge end of the belt conveyor. The steel slag temperature detection device 21 at the discharge end of the belt conveyor will adjust the spray volume of the humidifying spray gun in real time according to the discharge temperature.

[0054] This invention provides a high-temperature steel slag graded cooling and crushing and f-CaO high-efficiency digestion system. Different cooling and crushing devices and processes are adopted according to the mineral decomposition and lattice transformation characteristics of steel slag at different stages. It eliminates the need for the original pressurized tank heat treatment device, effectively reduces the consumption of cooling water, and significantly improves the crushing efficiency of steel slag. The crushed steel slag material is smaller in size, which improves the conversion rate of f-CaO digestion in steel slag and creates conditions for realizing the recovery of waste heat from steel slag.

[0055] Specifically, the liquid steel slag is first converted into solid high-temperature steel slag using a primary wet cooling and crushing device, while simultaneously undergoing preliminary cooling and crushing. Next, a secondary closed dry cooling and crushing device further cools and crushes the steel slag to obtain fine-particle, low-temperature steel slag. This operation utilizes a membrane wall structure to cool the steel slag, effectively absorbing residual heat. Then, a three-stage continuous conveying and atomizing cooling high-efficiency digestion device allows the steel slag to fully react with water, accelerating the digestion of f-CaO and improving the conversion rate. The steel slag produced after these three stages is significantly smaller than that produced by the current pressurized hot quenching process. Furthermore, the multi-stage cooling process ultimately reduces the steel slag temperature to 50-100℃. Because the steel slag is crushed into fine particles in the secondary closed dry cooling and crushing device, it facilitates a full reaction between the steel slag and water, accelerating the digestion of f-CaO and greatly improving the batch homogeneity of the residual f-CaO components. This enhances the conversion rate of the steel slag digestion reaction and the overall utilization rate of the steel slag.

Claims

1. A high-temperature steel slag grading, cooling, crushing and f-CaO efficient digestion system, characterized in that: The system includes a liquid slag tank (1), a primary wet cooling roller crushing device (2), a secondary closed dry cooling crushing device (6), a transfer slag tank (4) for transferring steel slag between the primary wet cooling roller crushing device (2) and the secondary closed dry cooling crushing device (6), a tertiary continuous conveying and atomizing cooling high-efficiency digestion device (7), a cooling water closed circulation device (8), and a control device. The liquid slag tank (1) is located above the inlet of the primary wet cooling roller crushing device (2), the steel slag temperature control device (3) is located below the primary wet cooling roller crushing device (2), the cooling water closed circulation device (8) is connected to the secondary closed dry cooling crushing device (6), and the tertiary continuous conveying and atomizing cooling high-efficiency digestion device (7) is located below the outlet of the secondary closed dry cooling crushing device (6). The primary wet cooling roller crushing device (2), the tertiary continuous conveying and atomizing cooling high-efficiency digestion device (7), and the cooling water closed circulation device (8) are electrically connected to the control device.

2. The system according to claim 1, characterized in that: The lower part of the primary wet cooling roller crushing device (2) is equipped with a steel slag temperature control device (3), and the output end of the steel slag temperature control device (3) is connected to the input end of the control device.

3. The system according to claim 1, wherein the system is characterized in that: The secondary closed dry cooling crushing device (6) is equipped with a conveying weight control device (5) above the feed inlet, and the conveying weight control device (5) is electrically connected to the control device.

4. The system according to claim 3, characterized in that: The conveying weight control device (5) includes a vibrating feeder, on which a weight sensor is installed. The controlled end of the vibrating feeder is connected to the controlled end of the control device, and the output end of the weight sensor is connected to the input end of the control device.

5. The high-temperature steel slag graded cooling crushing and f-CaO high-efficiency digestion system according to claim 1, characterized in that: The secondary closed dry cooling crushing device (6) includes a drum slag cooler. The drum slag cooler has a membrane wall structure and a spiral stirring composite crushing component is installed inside the drum slag cooler.

6. The system according to claim 5, wherein the system is characterized in that: The spiral stirring composite crushing component includes a guide plate (10) and a shaped stirring rod disposed on a water-cooled pipe (9) in a membrane wall structure. The guide plate (10) and the shaped stirring rod are arranged at intervals. The guide plate (10) is distributed in a spiral structure along the discharge direction of the cylinder. The guide plate (10) is a straight plate structure and the radial height of the guide plate (10) is arranged in three stages with a gradually increasing trend along the discharge direction. The shaped stirring rod is disposed in the front half area of ​​the drum feed side and includes a base (11) and a rod head. The rod head located in the front section of the drum feed is a spherical rod head (12), and the rod head located in the rear section of the drum feed is a cylindrical rod head (13).

7. The system according to claim 1, wherein the system further comprises a high-temperature steel slag grading, cooling, crushing and f-CaO efficient elimination system. The three-stage continuous conveying and atomizing cooling high-efficiency digestion device (7) includes a buffer bin (15), a cylindrical feeder (17), an aerosol spray gun (18), a humidifying spray gun (20), and a belt conveyor (22). The buffer bin (15) is provided with a material gate (16) at the bottom. The controlled end of the material gate (16) is connected to the output end of the control device. The cylindrical feeder (17) is located below the buffer bin (15), and the belt conveyor (22) is located below the cylindrical feeder (17). A downwardly inclined bar screen (19) is provided on the outside of the cylindrical feeder (17). The aerosol spray gun (18) is located above and below the bar screen (19), respectively. The humidifying spray gun (20) is located above the belt conveyor (22).

8. The system according to claim 7, characterized in that: The top of the buffer compartment (15) is provided with a material level detection device (14), and the output end of the material level detection device (14) is connected to the input end of the control device.

9. The system according to claim 7, characterized in that: A steel slag temperature detection device (21) is installed above the discharge end of the belt conveyor (22), and the output end of the steel slag temperature detection device (21) is connected to the input end of the control device.

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