Short-process steelmaking slag basin turnover hot stuffy slag treatment system and treatment process

Abstract

The short-process steelmaking slag basin turnover hot stuffy slag treatment system comprises a slag stuffy workshop, a washing tower is arranged outside the slag stuffy workshop, and an air inducing and discharging mechanism connected with the washing tower is arranged in the slag stuffy workshop; a slag disintegration area is arranged on the ground of the slag disintegration workshop, a plurality of slag disintegration positions which are arranged side by side are arranged in the slag disintegration area, a dumping area is arranged on one side of the slag disintegration area, a plurality of dumping positions which are arranged side by side are arranged in the dumping area, the arrangement directions of the dumping positions and the slag disintegration positions are the same, and the slag disintegration positions and the dumping positions are both located in the air inducing range of the air inducing and discharging mechanism; a crane is arranged in the slag disintegrating workshop, and a hoisting moving route of the crane passes through the dumping position and the slag disintegrating position; a spraying mechanism is arranged in the slag disintegrating workshop, a plurality of nozzles are arranged on the spraying mechanism, and the nozzles are uniformly distributed above each slag disintegrating position. The device has the advantages of capability of keeping the workshop operation environment clean, small occupied area and high treatment efficiency.

Description

Technical Field

[0001] This invention belongs to the field of hot slag treatment system for steelmaking slag basin turnover. Background Technology

[0002] The steel slag produced in the short-process smelting is poured into slag basins and transported by truck to the steel slag processing workshop. In the workshop, it enters a slag-cooling pit, where water or air is used to slowly cool the slag. This cooling process generates a large amount of dust and mist. After initial cooling, the slag is stabilized. After a period of cooling, a crane lifts the slag basin to the other end of the plant and dumps it into the workshop. Water is applied for further cooling, and large pieces of scrap steel are manually removed. The remaining tailings are loaded onto trucks and sold to other processing plants. However, the slag-cooling and dumping processes generate large amounts of dust-laden fumes, with particulate matter as the main pollutant, severely impacting the workshop's working environment. The short-process electric arc furnace steelmaking for special steel and stainless steel involves multiple steel types in small batches, making centralized hot-pouring processing impossible. Referring to the centralized hot-pouring processing of the long-process, the cold steel blocks within the slag after hot-cooling have high value and cannot be quickly sorted and recycled. Furthermore, it requires numerous underground slag-cooling pits, which occupy a large area and are difficult to excavate after hot-cooling, resulting in low processing efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a short-process steelmaking slag basin turnover hot slag treatment system and process. This invention has the advantages of maintaining a clean workshop environment, requiring minimal space, and offering high processing efficiency.

[0004] The technical solution of the present invention: a short-process steelmaking slag basin turnover hot slag treatment system, including a slag slagging workshop, a washing tower outside the slag slagging workshop, and an exhaust fan connected to the washing tower inside the slag slagging workshop; The slag-sealing workshop has a slag-sealing area on the ground, with multiple slag-sealing positions arranged side by side within the slag-sealing area. A dumping area is located on one side of the slag-sealing area, with multiple dumping positions arranged side by side within the dumping area. The dumping positions and slag-sealing positions are arranged in the same direction, and both the slag-sealing positions and the dumping positions are located within the exhaust range of the exhaust ventilation mechanism. The slag-filling workshop is equipped with an overhead crane, whose lifting and moving route passes through the dumping position and the slag-filling position; The slag curing workshop is equipped with a spraying system, which has multiple nozzles, with nozzles distributed above each slag curing position.

[0005] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, a water supply mechanism is provided outside the slag-filling workshop. The water supply mechanism includes a primary sedimentation tank, which is connected to a clear water tank through a secondary sedimentation tank. The clear water tank is connected to a spraying mechanism, and the clear water tank is connected to the inlet of the washing tower through a first water pump. A water replenishment pipe is connected to the clear water tank, and the primary sedimentation tank is connected to the outlet of the washing tower.

[0006] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, the induced draft exhaust mechanism includes an induced draft main pipe connected to the air inlet of the washing tower, multiple induced draft branch pipes connected to the induced draft main pipe, and a first valve installed on the induced draft branch pipes. The air inlets of some induced draft branch pipes are located above multiple slag filling positions, and the air inlets of the remaining induced draft branch pipes are located above multiple tilting positions. Each slag-sealing position and one of the dumping positions are equipped with a movable collection hood. The collection hood above the slag-sealing position moves perpendicular to the arrangement direction of the slag-sealing position, and the collection hood above the dumping position moves parallel to the arrangement direction of the dumping position. The top of the collection hood is equipped with a smoke exhaust pipe for connecting to the induced draft branch pipe.

[0007] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, the bottom of the collection hood is equipped with an electrically driven translational support frame.

[0008] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, the top of the collection hood located above the dumping position is equipped with a rope passage.

[0009] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, the spraying mechanism includes a spraying main pipe, which is connected to a clear water tank via a second water pump. The spraying main pipe is connected to multiple nozzles via multiple spraying branch pipes, and a second valve is provided on each spraying branch pipe.

[0010] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, four nozzles are distributed above each slag slagging position.

[0011] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, a U-shaped retaining wall is provided on the outside of the dumping position.

[0012] In the aforementioned short-process steelmaking slag basin turnover hot slag treatment system, the induced draft branch pipe is detachably connected to the exhaust pipe through a telescopic compensation mechanism.

[0013] The aforementioned short-process steelmaking slag basin turnover hot slag treatment system involves transferring the slag basin containing steel slag to the slag-filling position via a crane, spraying a certain amount of cooling water onto the slag basin via a spraying mechanism, and conveying the flue gas to the scrubbing tower via an induced draft exhaust mechanism. The flue gas is then cleaned by the scrubbing tower to meet emission requirements. After the steel slag cools, it is transferred to the dumping position by a crane. The crane lifts one side of the slag basin, causing it to flip over and dump the steel slag. The dust generated during the dumping process is then transported to the washing tower by an exhaust fan.

[0014] Compared with the prior art, in the present invention, a plurality of slag quenching positions and a plurality of dumping positions are directly arranged on the workshop floor. The steel slag is kept in the slag basin for spray slag quenching to cool down. After the steel slag is cooled, it is transferred to the dumping position for outward transportation. The flue gas generated during the slag quenching and dumping processes enters the scrubbing tower for treatment, meeting the emission requirements while keeping the workshop operating environment clean.

[0015] Since the steel slag during the treatment process is measured in slag basins and the amount of steel slag treated each time is small, and the workshop floor is equipped with a plurality of slag quenching positions and a plurality of dumping positions, it is particularly suitable for the small-batch mode of multiple steel grades in short-process smelting. The areas of the slag quenching positions and the dumping positions are correspondingly small, much smaller than the area of the slag quenching pit supporting long-process smelting, resulting in a small floor area occupied.

[0016] Since the steel slag is kept in the slag basin during slag quenching, there is no need to dig it out after slag quenching is completed. It can be lifted by the overhead crane to the dumping position and poured out, with high processing efficiency.

[0017] In summary, the present invention has the advantages of keeping the workshop operating environment clean, having a small floor area occupied, and high processing efficiency. [[ID=ll]]BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a top view schematic diagram of the present invention.

[0019] Figure 2 is a front view schematic diagram of the present invention.

[0020] Figure 3 is Figure 1 a schematic diagram at A - A.

[0021] Figure 4 is Figure 1 a schematic diagram at B - B

[0022] Figure 5 is a schematic diagram of the expansion compensation mechanism.

[0023] The reference numerals in the drawings are: 1 - slag quenching workshop, 2 - scrubbing tower, 3 - slag quenching area, 4 - slag quenching position, 5 - dumping position, 6 - overhead crane, 7 - nozzle, 8 - primary sedimentation tank, 9 - secondary sedimentation tank, 10 - clear water tank, 11 - first water pump, 12 - water supply pipe, 13 - main air draft pipe, 14 - air draft branch pipe, 15 - first valve, 16 - capture hood, 17 - smoke exhaust pipe, 18 - support frame, 19 - rope passing hole, 20 - spray main pipe, 21 - second water pump, 22 - spray branch pipe, 23 - retaining wall, 24 - slag basin, 25 - dumping area, 26 - second valve, 27 - upper flange, 28 - lower flange, 29 - expansion pipe, 30 - middle flange, 31 - sealing ring, 32 - iron ring plate, 33 - spring, 34 - electromagnetic coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0025] Example: Short-process steelmaking slag basin turnover hot slag treatment system, such as Figure 1 As shown, it includes a slag curing workshop 1, a washing tower 2 is provided outside the slag curing workshop 1, and an exhaust system connected to the washing tower 2 is provided inside the slag curing workshop 1.

[0026] The slag-sealing workshop 1 has a slag-sealing area 3 on the ground. There are five slag-sealing positions 4 arranged side by side in the slag-sealing area 3. There is a dumping area 25 on one side of the slag-sealing area 3. There are three dumping positions 5 arranged side by side in the dumping area 25. The dumping positions 5 and the slag-sealing positions 4 are arranged in the same direction. Both the slag-sealing positions 4 and the dumping positions 5 are located within the exhaust range of the exhaust ventilation mechanism.

[0027] The slag-sealing workshop 1 is equipped with a crane 6. The lifting and moving route of the crane 6 passes through all the dumping positions 5 and all the slag-sealing positions 4. The lifting end of the crane 6 can move forward and backward, left and right, and up and down.

[0028] The slag curing workshop 1 is equipped with a spraying mechanism with twenty nozzles 7. Four nozzles 7 are distributed above each slag curing position 4, and the four nozzles 7 are located at the four corners of a square.

[0029] The slag-storage workshop 1 is equipped with a water supply system, which includes a primary sedimentation tank 8. The primary sedimentation tank 8 is connected to a clear water tank 10 through a secondary sedimentation tank 9. The clear water tank 10 is connected to a spraying mechanism. The clear water tank 10 is connected to the inlet of the washing tower 2 through a first water pump 11. A water supply pipe 12 is connected to the clear water tank 10. The primary sedimentation tank 8 is connected to the outlet of the washing tower 2.

[0030] The exhaust system includes a main exhaust pipe 13 connected to the air inlet of the scrubbing tower 2. Eight branch exhaust pipes 14 are connected to the main exhaust pipe 13, each equipped with a first valve 15. The air inlets of five branch exhaust pipes 14 are located above five slag-sealing positions 4, while the air inlets of the remaining branch exhaust pipes 14 are located above three tilting positions 5. Some scrubbing towers 2 have built-in exhaust fans, eliminating the need for an exhaust fan on the main exhaust pipe 13. When the scrubbing tower 2 does not have a built-in exhaust fan, the exhaust fan connects to the air inlet of the scrubbing tower 2 via the main exhaust pipe 13.

[0031] A movable collection hood 16 is provided above each slag filling position 4 and above one of the dumping positions 5. The direction of movement of the collection hood 16 above the slag filling position 4 is perpendicular to the arrangement direction of the slag filling position 4, and the direction of movement of the collection hood 16 above the dumping position 5 is parallel to the arrangement direction of the dumping position 5. The height of the collection hood 16 above the ground should exceed the height of the slag basin 24 to avoid the collection hood 16 hitting the slag basin 24 when it moves. The top of the collection hood 16 is provided with a flue pipe 17 for connecting to the induced draft branch pipe 14.

[0032] The bottom of the trap hood 16 is provided with an electrically driven translational support frame 18. The electric drive mechanism of the support frame 18 can be a hub motor located at the bottom of the support frame 18. In order to make the exhaust pipe 17 on the trap hood 16 accurately connect with the air duct branch pipe 14, a track can be set on the ground to guide the movement of the support frame.

[0033] The top of the trap 16 located above the tilting position 5 is provided with a rope passage 19.

[0034] The spraying mechanism includes a main spray pipe 20, which is connected to a clear water tank 10 via a second water pump 21. The main spray pipe 20 is connected to twenty nozzles 7 via twenty branch spray pipes 22, each branch pipe 22 equipped with a second valve 26. When the branch spray pipes 22 are higher than the bottom surface of the collection hood 16, holes should be provided on the collection hood 16 for the branch spray pipes 22 to pass through. The nozzles 7 are spiral hollow cone nozzles with an atomized particle size of 150~300μm.

[0035] A U-shaped retaining wall 23 is provided on the outside of the tilting position 5.

[0036] Preferably, a telescopic compensation mechanism is provided between the exhaust branch pipe 14 and the exhaust pipe 17. The telescopic compensation mechanism includes an upper flange 27 extending radially outward from the end of the exhaust branch pipe 14 and a lower flange 28 extending radially outward from the end of the exhaust pipe 17. A telescopic tube 29 is provided on the inner side of the end of the exhaust pipe 17. The telescopic tube 29 is made of a non-magnetic material, such as POM or aluminum alloy. One end of the telescopic tube 29 extends outward from the exhaust pipe 17 and forms a middle flange 30 located between the upper flange 27 and the lower flange 28. A sealing ring 31 is provided between the middle flange 30 and the upper flange 27. The sealing ring 31 is fixed to the upper flange 27 or the middle flange 30. An iron ring plate 32 is provided between the middle flange 30 and the lower flange 28. The iron ring plate 32 is fixed to the middle flange 30. Multiple circumferentially distributed springs 33 are provided between the iron ring plate 32 and the lower flange 28. The iron ring plate 32 and the lower flange 28 are both connected to the springs 33. An electromagnetic coil 34 fixed to the lower flange 28 is sleeved on the exhaust pipe 17. When the electromagnetic coil 34 is energized, the generated magnetic field causes the iron ring plate 32 to compress the spring 33. The iron ring plate 32, through the middle flange 30, causes the telescopic tube 29 to retract into the exhaust pipe 17, facilitating the movement of the collection hood 16. The retraction stroke of the telescopic tube 29 is about 0.5 cm. When the electromagnetic coil 34 is not energized, under the force of the spring 33, the middle flange 30 is pressed against the sealing ring 31 to maintain the airtightness between the induced draft branch pipe 14 and the exhaust pipe 17.

[0037] Processing technology and working principle: Taking the operation of any slag-sealing station 4 as an example, such as Figure 3As shown, first remove the collection cover 16 above the slag filling position 4, then use the crane 6 to lift the slag basin 24 containing steel slag to the slag filling position 4. Four slag basins 24 are placed in one slag filling position 4. The four slag basins 24 are located below the four nozzles 7 respectively. Then move the collection cover 16 back above the slag basin 24.

[0038] Open valve 26 on the corresponding spray main pipe 20. Cooling water drawn from the clear water tank 10 by the second water pump 21 is ejected from nozzle 7 through the spray main pipe 20 and spray branch pipe 22, forming a water mist to cool the steel slag. Open valve 15 on the corresponding induced draft branch pipe 14. The airflow generated by the induced draft fan creates a negative pressure inside the collection hood 16, driving the flue gas generated during the spraying process into the scrubbing tower 2. After the flue gas is cleaned, it is discharged from the flue of the scrubbing tower 2.

[0039] Wastewater generated from the cleaning of flue gas by scrubbing tower 2 enters primary sedimentation tank 8, where it undergoes preliminary sedimentation. The supernatant overflows into secondary sedimentation tank 9, where it undergoes further sedimentation and then overflows into clear water tank 10. First water pump 11 draws water from the clear water tank into spray main pipe 20 to supply water for steel slag spraying, forming a closed loop. Water consumed during spraying can be replenished through water supply pipe 12, which is connected to a municipal water supply pipe.

[0040] After the steel slag is cooled to a safe temperature (e.g., below 50℃) by spraying and slag sealing, the collection hood 16 is removed, and the slag basin 24 is moved to the dumping position 5 using the overhead crane 6. At this point, the collection hood 16 should no longer be above the dumping position. Figure 4 As shown, the collection hood 16 of the slag-sealing area 3 is moved above the slag basin 24. The hoisting rope of the overhead crane 6 passes through the rope opening 19 and connects to one side of the slag basin 24. The slag basin 24 is lifted to a certain height, and then it is tilted to pour out the steel slag inside. During the pouring process, the first valve 15 on the induced draft branch pipe 14 corresponding to the pouring position 5 is opened, allowing the flue gas generated during the pouring process to enter the scrubbing tower 2. Since the slag-sealing time is much longer than the pouring time, only one collection hood 16 needs to be installed above the pouring area 25, which is shared by the three pouring positions 5.

[0041] Since the dust and fumes generated during the spraying and slag dumping processes are all drawn into the washing tower 2, the air quality in the slag-drying workshop 1 is kept relatively good.

[0042] For the trap hood 16, before moving, as Figure 5 As shown, first energize the sealing ring 31 to disconnect the induced draft branch pipe 14 and the exhaust pipe 17. After moving to the designated position or moving back, de-energize the sealing ring 31 to reconnect the corresponding induced draft branch pipe 14 and the exhaust pipe 17.

[0043] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations.

Claims

1. A short process steelmaking slag basin turnover hot granulation slag treatment system, characterized in that: The slag granulation workshop (1) is externally provided with a washing tower (2), and the slag granulation workshop (1) is internally provided with an induced draft discharge mechanism connected with the washing tower (2); A slag granulation area (3) is arranged on the ground of the slag granulation workshop (1), a plurality of slag granulation positions (4) are arranged in parallel in the slag granulation area (3), a dumping area (25) is arranged on one side of the slag granulation area (3), a plurality of dumping positions (5) are arranged in parallel in the dumping area (25), the arrangement directions of the dumping positions (5) and the slag granulation positions (4) are the same, and the slag granulation positions (4) and the dumping positions (5) are all located in the induced draft range of the induced draft discharge mechanism; A travelling crane (6) is arranged in the slag granulation workshop (1), and the lifting and moving route of the travelling crane (6) passes through the dumping positions (5) and the slag granulation positions (4); A spraying mechanism is arranged in the slag granulation workshop (1), a plurality of nozzles (7) are arranged on the spraying mechanism, and the nozzles (7) are distributed above each slag granulation position (4).

2. The short- stroke steelmaking slag basin turnover hot granulation slag treatment system according to claim 1, characterized in that: The slag granulation workshop (1) is externally provided with a water supply mechanism, the water supply mechanism comprises a primary sedimentation tank (8), the primary sedimentation tank (8) is connected with a clean water tank (10) through a secondary sedimentation tank (9), the clean water tank (10) is connected with the spraying mechanism, the clean water tank (10) is connected with a water inlet of the washing tower (2) through a first water pump (11), the clean water tank (10) is connected with a water replenishing pipe (12), and the primary sedimentation tank (8) is connected with a water outlet of the washing tower (2).

3. The short-stroke steelmaking slag basin turnover hot granulation slag treatment system according to claim 1, characterized in that: The induced draft discharge mechanism comprises an induced draft main pipe (13) connected with an air inlet of the washing tower (2), a plurality of induced draft branch pipes (14) are connected with the induced draft main pipe (13), first valves (15) are arranged on the induced draft branch pipes (14), air inlets of a part of the induced draft branch pipes (14) are respectively located above the plurality of slag granulation positions (4), and air inlets of the remaining induced draft branch pipes (14) are respectively located above the plurality of dumping positions (5); A movable capture cover (16) is arranged above each slag granulation position (4) and above one of the dumping positions (5), the moving direction of the capture cover (16) above the slag granulation position (4) is perpendicular to the arrangement direction of the slag granulation position (4), the moving direction of the capture cover (16) above the dumping position (5) is parallel to the arrangement direction of the dumping position (5), and a smoke exhaust pipe (17) for connecting the induced draft branch pipe (14) is arranged on the top of the capture cover (16).

4. The short- stroke steelmaking slag basin turnover hot granulation slag treatment system according to claim 3, characterized in that: The bottom of the capture cover (16) is provided with a support frame (18) which is driven to move by electricity.

5. The short-stroke steelmaking slag pot carousel turn-around hot granulation slag processing system of claim 3, wherein: The top of the capture cover (16) above the dumping position (5) is provided with a rope passing opening (19).

6. The short- stroke steelmaking slag basin turn-over hot granulation slag handling system of claim 2 wherein: The spraying mechanism comprises a spraying main pipe (20), the spraying main pipe (20) is connected with the clean water tank (10) through a second water pump (21), the spraying main pipe (20) is connected with the plurality of nozzles (7) through a plurality of spraying branch pipes (22), and second valves (26) are arranged on the spraying branch pipes (22).

7. The short- stroke steelmaking slag basin turnover hot granulation slag treatment system according to claim 6, characterized in that: Four nozzles (7) are arranged above each slag granulation position (4).

8. The short- stroke steelmaking slag basin turn-over hot granulation slag handling system of claim 1 wherein: The outer side of the dumping position (5) is provided with a U-shaped retaining wall (23).

9. The short- stroke steelmaking slag basin turn-over hot granulation slag handling system of claim 1 wherein: The induced draft branch pipe (14) is detachably connected with the smoke exhaust pipe (17) through a telescopic compensation mechanism.

10. The process for the treatment of a short-stroke steelmaking slag basin turnover hot granulation slag treatment system according to any one of claims 1 to 9, characterized in that: The slag basin (24) containing the steel slag is transferred to the smothering position (4) by the travelling crane (6), a certain amount of cooling water is sprayed to the slag basin (24) by the spraying mechanism, the flue gas is transported to the washing tower (2) by the induced draft exhaust mechanism, the flue gas is cleaned by the washing tower (2), and the flue gas meets the emission requirements; After the steel slag is cooled, the slag basin (24) is transferred to the pouring position (5) by the travelling crane (6), one side of the slag basin (24) is lifted by the travelling crane (6), the slag basin (24) is overturned, the steel slag is poured out, and the dust generated in the pouring process is transported to the washing tower (2) by the induced draft exhaust mechanism.

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