A slag slow cooling system and a slag slow cooling method

Abstract

The present application provides a kind of slow cooling method of furnace slag, it includes: using slag ladle interface slag, using air cooling component to the air cooling of slag ladle to make slag ladle outer surface temperature drop to 400-500 DEG C, after continuing to use water mist spray component to the water mist spray of slag ladle to make slag ladle outer surface temperature drop to 100-200 DEG C, after using water spray component again to the water spray of slag ladle to make slag ladle outer surface temperature drop to 40-50 DEG C, finally unloading slag.The present application solves the problem of the existing technology that hot melt slag is contacted with a large amount of water in the initial stage of water cooling, resulting in the explosion of slag ladle.The present application also provides a kind of slow cooling system of furnace slag.

Description

Technical Field

[0001] This invention relates to the field of slag cooling equipment technology, and in particular to a slag slow cooling system and a slag slow cooling method. Background Technology

[0002] With the development of copper smelting technology, the recycling of smelting slag has become an inevitable choice for the copper smelting industry. Copper smelting slag is actually a kind of artificial ore. The copper mineral particles and phase composition in this ore depend on the slag cooling rate. When slowly cooled above the phase transformation temperature (1080℃), the copper mineral particles will aggregate and grow. The reason why copper in the slag can be enriched into the concentrate through flotation is that the slag forms mechanically separable copper mineral particles during the cooling process. Separation is achieved by utilizing the differences in their surface physicochemical properties compared with other slag-forming materials. The crystal size of copper minerals in the slag is closely related to the slag cooling rate. The slower the cooling rate, the coarser the crystals, making it easier to achieve monomer dissociation. Extending the slow cooling time is conducive to the full growth of crystals.

[0003] Currently, the slag is typically cooled before recycling. The specific process involves first discharging the slag (temperature 1280℃~1320℃) through a slag outlet into a slag bag, then transporting it by slag bag car to a slow cooling zone. This slow cooling process involves allowing the slag bag to cool naturally for a period before continuously spraying cooling water onto it. This is called the water cooling stage. Once the slag in the bag has cooled to a certain temperature, it undergoes slag beneficiation to obtain slag concentrate, which is then sent to the smelting furnace for recycling. However, during the water cooling stage after natural cooling, the solidified slag develops cracks from the surface downwards. When these cracks reach a certain size, the internal pressure of the slag bag causes them to expand rapidly, resulting in a high-temperature, high-pressure gas flow that releases energy instantaneously (i.e., an explosion). The high-pressure gas flow and the shock wave from the explosion cause a large amount of solid slag and a small amount of liquid slag to splash out of the slag bag, leading to safety issues such as slag bag explosions. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a slow slag cooling method, which solves the problem of slag bag explosion caused by the contact between hot molten slag and a large amount of water in the initial stage of water cooling in existing technologies.

[0005] According to an embodiment of the present invention, a method for slow cooling of slag includes:

[0006] The slag is collected using a slag bag. The slag bag is then cooled by air using an air-cooling unit to reduce the outer surface temperature of the slag bag to 400-500℃. After that, the slag bag is sprayed with water mist using a water mist spraying unit to reduce the outer surface temperature of the slag bag to 100-200℃. Then, the slag bag is sprayed with water using a water spraying unit to reduce the outer surface temperature of the slag bag to 40-50℃. Finally, the slag is discharged.

[0007] Furthermore, the slag bag is air-cooled for 4-8 hours.

[0008] Furthermore, the water mist spraying time for the slag bag is 2-4 hours.

[0009] Furthermore, the water spraying time for the slag bag is 1-2 hours.

[0010] In a further embodiment, the present invention also provides a slow cooling system for implementing the above method, which includes a track and air-cooling components, water mist spraying components and water spraying components arranged on the track and connected in sequence, and also includes a power trolley that travels on the track, with a slag bag arranged on the power trolley; and also includes a water collection tank for collecting water vapor and water generated by the water mist spraying components and the water spraying components.

[0011] Furthermore, the air-cooled assembly includes an air duct and a first fan connected to the air duct. The air duct is also fixedly connected to several branch air nozzles. The track has a first track section parallel to the air duct, and the branch air nozzles point to the first track section.

[0012] Furthermore, the water mist spraying assembly includes a water mist spraying pipe and several branch pipe water mist nozzles fixedly connected to the water mist spraying pipe. The track has a second track section parallel to the water mist spraying pipe, and the branch pipe water mist nozzles point towards the second track section.

[0013] Furthermore, the water spray assembly includes a water spray pipe and several branch pipe water nozzles fixedly connected to the water spray pipe. The track has a third track section parallel to the water spray pipe, and the branch pipe water nozzles point to the third track section.

[0014] Furthermore, there is a pair of tracks, and a water collection trough is fixedly installed between the two tracks. The water collection trough is connected to the water collection tank through a pipe.

[0015] Furthermore, water vapor collection covers are fixedly connected above the two tracks.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention achieves rapid cooling of slag through multi-stage cooling of air cooling, water mist spraying, and water spraying, reducing cooling time and making it suitable for cooling large-scale slag bags.

[0018] 2. In order to avoid explosion caused by a large amount of water coming into contact with hot slag after the air cooling is completed, the present invention uses water mist spraying to cool the slag after the air cooling is completed. This method enhances the thickness and strength of the slag shell layer while avoiding explosion caused by a large amount of water coming into contact with hot slag in the early stage of the spraying process.

[0019] 3. It solves the safety problems such as slag bag explosion caused by the high-pressure airflow and the shock wave generated by the explosion, which caused a large amount of solid slag and a small amount of liquid slag to splash out of the slag bag. Attached Figure Description

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

[0021] Figure 2 This is a partial schematic diagram of the water vapor collection hood according to an embodiment of the present invention. Figure 1 ;

[0022] Figure 3 This is a partial schematic diagram of the water vapor collection hood according to an embodiment of the present invention. Figure 2 ;

[0023] In the above attached figures:

[0024] 1. Track, 2. Water collection tank, 3. Water vapor collection hood, 4. Power trolley, 5. Slag bag, 6. Water collection tank, 7. First pipe, 8. Second pipe, 9. Air duct, 10. First fan, 11. Branch pipe air nozzle, 12. Temperature sensor, 13. Water mist spray pipe, 14. Branch pipe water mist nozzle, 15. Branch pipe water nozzle, 16. Short pipe section, 17. Valve, 18. Proximity switch, 19. Curved top, 20. Groove, 21. Detailed Implementation

[0025] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] like Figure 1 , 2 As shown in Figure 3, this embodiment provides a slag slow cooling system, which includes a track 1, which is a pair of parallel tracks 1, and a water collection tank 2 is fixedly installed between the two tracks 1. A water vapor collection hood 3 is fixedly installed above the two tracks 1 by a steel frame. A power trolley 4 that can travel on the two tracks 1 is installed on the two tracks 1. A slag bag 5 is installed on the power trolley 4. The slag bag 5 is used to load slag, and then the slag is moved from one end of the two tracks 1 to the other end by the power trolley 4 inside the slag bag 5.

[0028] like Figure 1 , 2As shown, an air-cooling component, a water mist spraying component, and a water spraying component are sequentially installed along the path from one end of the two tracks 1 to the other. A water collection tank 6 is also installed on one side of the two tracks 1. The water collection tank 6 is connected to the water collection trough 2 through the first pipe 7. Specifically, as the power trolley 4 moves on the track 1, it passes through the air-cooling component, the water mist spraying component, and the water spraying component in sequence. During the process of passing through the water mist spraying component and the water spraying component, a large amount of water will fall from the power trolley 4 into the water collection trough 2. (Both the slag bag 5 and the power trolley 4 are equipped with water leakage holes, through which water falls into the lower...) The water is collected in the water collection tank 2. At the same time, due to the high temperature of the slag, the water will be vaporized. After the vaporized water rises, it is blocked by the water vapor collection hood 3, and then cooled into water and flows back to the water collection tank 6 through the second pipe 8. Specifically, one end of the water collection tank 2 is closed and the other end is guided into the water collection tank 6 through the first pipe 7 for temporary storage. Furthermore, the water in the water collection tank 6 can be cooled and then reintroduced into the water spray assembly and / or water mist spray assembly for reuse, thereby forming a water resource recycling system and achieving the purpose of water resource conservation.

[0029] like Figure 1 As shown, the air-cooling assembly includes an air duct 9 and a first fan 10 connected to the air duct 9. The air duct 9 is also fixedly connected to several branch air nozzles 11. The track 1 has a first track section parallel to the air duct 9, and the branch air nozzles 11 point towards the first track section. This allows the air blown out by the first fan 10 to pass through the air duct 9 and then be blown out by the multiple branch air nozzles 11 towards the first track section to air-cool the power trolley 4 passing through the first track section, the slag bag 5 on it, and the slag inside the slag bag 5. In particular, the outlet of the branch air nozzle 11 is slightly higher than the power trolley 4 to air-cool the slag bag 5. A temperature sensor 12 is also provided between two adjacent branch air nozzles 11 to detect the temperature of the slag bag 5. The temperature sensor 12 and the branch air nozzles 11 are equidistant from each other to continuously monitor the temperature of the slag bag 5 during the air-cooling process.

[0030] like Figure 1 As shown, the water mist spraying assembly includes a water mist spraying pipe 13 and several branch pipe water mist nozzles 14 fixedly connected to the water mist spraying pipe 13. The track 1 has a second track section parallel to the water mist spraying pipe 13, and the branch pipe water mist nozzles 14 point towards the second track section. Specifically, the water mist spraying assembly also includes an air compressor that provides compressed air. The branch pipe water mist nozzles 14 spray water mist onto the slag bag 5 and the slag inside the slag bag 5, thereby reducing the temperature of the slag and the slag bag 5. Similarly, a temperature sensor 12 for detecting the temperature of the slag bag 5 is also provided between two adjacent branch pipe water mist nozzles 14, and the temperature sensor 12 and the branch pipe water mist nozzles 14 are equidistant from each other to continuously monitor the temperature of the slag bag 5 during the water mist spraying process.

[0031] like Figure 1 As shown, the water spray assembly includes a water spray pipe 15 and several branch pipe water nozzles 16 fixedly connected to the water spray pipe 15. The track 1 has a third track section parallel to the water spray pipe 15, and the branch pipe water nozzles 16 point to the third track section. The water spray pipe 15 is supported by a bracket, so that the water spray pipe 15 can be parallel to the third track section. The water spray pipe 15 is connected by multiple short pipe sections 17, which are separated by valves 18. Therefore, the number of valves 18 to be opened can be selected according to the number of spray slag bags 5. When the number is small, only one spray pump can be turned on (the spray power of water mist spray and water spray is provided by multiple pump bodies respectively) to achieve efficient use of energy. Similarly, a temperature sensor 12 can also be set between two adjacent branch pipe water nozzles 16.

[0032] like Figure 1 As shown, proximity switches 19 are installed at the front ends of air duct 9, water mist spray pipe 13, and water spray pipe 15. Specifically, slag is first loaded into slag bag 5. When slag bag 5 arrives at the first track section with power trolley 4, the first proximity switch 19 outputs a signal to connect the circuit of the first blower 10, and the first blower 10 starts working. Cold air enters each branch pipe nozzle 11 through air duct 9 to cool slag bag 5. Temperature sensor 12 monitors the temperature change of the outer surface of slag bag 5 within this section, and the speed of power trolley 4 is adjusted based on the feedback of the temperature change of slag bag 5. When the outer surface temperature of slag bag 5 drops to the set value, power trolley 4 leaves the first track section and then enters the second track section (the outer surface temperature of slag bag 5 is reduced to 400-500℃ in the first track section over 4-8 hours).

[0033] Upon entering the second track section, the second proximity switch 19 outputs a signal, and the pump of the water mist spray pipe 13 starts working. Water and compressed air enter the water mist spray pipe 13, and a spray is formed from the branch pipe water mist nozzle 14. The temperature sensor 12 within this section monitors the temperature change of the outer surface of the slag bag 5 and provides feedback on the temperature change of the slag bag 5. The speed of the power trolley 4 is adjusted accordingly. When the outer surface temperature of the slag bag 5 drops to the set value, the power trolley 4 leaves the second track section and enters the third track section (within the second track section, the outer surface temperature of the slag bag 5 is reduced to 100-200℃ over 2-4 hours).

[0034] Upon entering the third track section, the third proximity switch 19 outputs a signal, the pump of the water spray pipe 15 starts working, and water enters the water spray pipe 15. The temperature sensor 12 within this section monitors the temperature change of the outer surface of the slag bag 5, and the speed of the power trolley 4 is adjusted based on the feedback of the temperature change of the slag bag 5. When the outer surface temperature of the slag bag 5 is about 50°C, the power trolley 4 leaves the third track section, and finally the slag is discharged, and the slag is poured out of the slag bag 5 for crushing (the outer surface temperature of the slag bag 5 is reduced to 40-50°C within the third track section for 1-2 hours). Furthermore, in this embodiment, the speed of the power trolley 4 is adjusted based on the feedback of the temperature change of the slag bag 5 by the temperature sensor 12, and the time of the slag bag 5 in the water mist spray and water spray stages is controlled, so that the slag is fully and slowly cooled, the copper mineral crystals in the slag grow fully, and it is easy to achieve monomer dissociation, creating favorable conditions for subsequent crushing. At the same time, the automated control of the slag slow cooling process reduces the labor intensity of the operators and improves the safety of the operators.

[0035] like Figure 1 , 3 As shown, the water vapor collection hood 3 has a curved top 20 in the middle, and the two sides bend upward to form grooves 21. After the water vapor rises, it contacts the inner top surface of the curved top 20 in the middle, and then condenses into water and flows along the curved top 20 to both sides into the two grooves 21. Grooves 21 are also provided at both ends of the water vapor collection hood 3. The four grooves 21 form an annular interconnected groove structure, and one end of the annular groove structure is lower than the other end. At the lower end of the groove structure, the water in the groove 21 is guided to the water collection tank 6 through the second pipe 8, so as to achieve circulation. In a further embodiment, several second fans can be provided above the water vapor collection hood 3 to blow cold air downward directly onto the upper surface of the curved surface to improve the efficiency of water vapor condensation.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A slag slow cooling system, characterized in that, The system includes a track and sequentially connected air-cooling components, water mist spraying components, and water spraying components mounted on the track; a power trolley that travels on the track, with a slag bag mounted on the power trolley; a water collection tank for collecting water vapor and water generated by the water mist spraying components; the air-cooling components include air ducts and a first fan connected to the air ducts, with several branch air nozzles fixedly connected to the air ducts; the water mist spraying components include water mist spraying pipes and several branch water mist nozzles fixedly connected to the water mist spraying pipes; the track has a first track section parallel to the air ducts, with the branch air nozzles pointing towards the first track section; the track also has a second track section parallel to the water mist spraying pipes. Furthermore, the branch pipe water mist nozzles point to the second track section, and the track has a third track section parallel to the water spray pipe; there is a pair of tracks, and a water collection trough is fixedly installed between the two tracks. The water collection tank is installed on one side of the two tracks, and the water collection tank is connected to the water collection trough through the first pipe; a water vapor collection hood is fixedly connected above the two tracks, and several second fans are installed above the water vapor collection hood; the water vapor collection hood has a curved top in the middle, and the two sides bend upward to form grooves. Grooves are also provided at both ends of the water vapor collection hood. The four grooves enclose an annular interconnected groove structure, and one end of the annular groove structure is lower than the other end. At the lower end of the groove structure, the water in the groove is guided to the water collection tank through the second pipe.

2. The slag slow cooling system as described in claim 1, characterized in that, The water spray assembly includes a water spray pipe and several branch pipe water nozzles fixedly connected to the water spray pipe, with the branch pipe water nozzles pointing towards the third track section.

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