Composite water quenching device for blast furnace molten iron slag

Abstract

A blast furnace molten iron slag composite water quenching device belongs to the field of water quenching of iron slag in blast furnace ironmaking and comprises a closed or semi-closed iron slag water quenching chamber and a water quenching pool located at the bottom of the iron slag water quenching chamber, an operation platform is arranged on one side in the iron slag water quenching chamber, and an iron slag throwing wheel driven by a power mechanism to rotate is arranged on the operation platform. The iron slag throwing wheel is positioned on an iron slag discharging track of the iron slag discharging channel, so that the iron slag discharged from the iron slag discharging channel is upwards beaten and thrown away in the rotating process of the iron slag throwing wheel, and the iron slag falls into a water quenching pool after penetrating through at least two water mist layers; and each water mist layer is a cooling water layer formed by collision of cooling water sprayed by a circle of atomized water spray pipes distributed at the same height in the iron slag water quenching chamber. After being thrown away, the iron slag can repeatedly penetrate through the water mist layer for multiple times in the process that the iron slag firstly ascends and then freely falls, rapid cooling is achieved, the iron slag finally falls into the water quenching pool, and it is also guaranteed that water quenching is fully carried out.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace slag treatment, specifically a composite water quenching device for blast furnace molten slag. Background Technology

[0002] In existing technologies, the iron slag produced by blast furnace ironmaking is generally water quenched, which involves pouring the high-temperature liquid iron slag into a water pool or rapidly cooling and granulating it through high-pressure water impact to form granulated blast furnace slag.

[0003] However, during water quenching, the contact between cooling water and high-temperature liquid iron slag generates a large amount of high-temperature water vapor, which not only wastes a lot of water resources, but also causes significant environmental damage due to the presence of harmful elements such as sulfides and chlorides in the water slag steam. Furthermore, the large amount of harmful elements such as sulfides also poses a significant health risk to workers in the area. In addition, the fine particulate matter contained in the steam can corrode surrounding buildings and parked vehicles after falling off.

[0004] Because steam contains a large number of harmful substances, even if it is recovered, it will lead to an increase in the maintenance costs of subsequent recovery equipment. Therefore, most companies discharge it in the open.

[0005] Some technologies also employ a closed environment for water quenching, thereby reducing pollution and damage to the surrounding environment. For example, the slag water quenching system disclosed in utility model patent application number 201822038213.X, and the blast furnace water quenching slag steam treatment device and slag steam treatment process disclosed in utility model patent application number 202210572202.8, both place the iron slag water quenching tank in a closed environment. Although this method can effectively prevent harmful substances in the steam from polluting the surrounding environment and can also recover water vapor, the use of cooling water rinsing still has the problems of large water consumption and long water quenching time. Utility Model Content

[0006] To address the problems of long quenching time and high water consumption in existing water quenching methods for treating iron slag, this invention provides a composite water quenching device for molten iron slag from blast furnaces. This device uses a slag flailer to strike and throw the iron slag into the air within a closed or semi-closed chamber. After passing through a water mist layer and cooling down, the molten iron slag falls into a water quenching tank, thus rapidly cooling the molten iron slag into small-particle iron slag. Compared to direct water quenching, this method effectively improves the efficiency of water quenching and reduces water consumption to some extent.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a composite water quenching device for blast furnace molten iron slag, including a closed or semi-closed iron slag water quenching chamber and a water quenching pool at the bottom of the iron slag water quenching chamber. An iron slag discharge ditch connected to the blast furnace slag discharge port is provided on one side of the iron slag water quenching chamber. An operating platform is provided on one side of the iron slag water quenching chamber. An iron slag throwing wheel driven by a power mechanism is provided on the operating platform. The iron slag throwing wheel is located on the iron slag discharge trajectory of the iron slag discharge ditch, so that when the iron slag throwing wheel rotates, it hits and throws the iron slag discharged from the iron slag discharge ditch upwards and flies it through at least two layers of water mist before falling into the water quenching pool. Each layer of water mist is a cooling water layer formed by the collision of cooling water sprayed from a ring of atomized water spray pipes distributed at the same height in the iron slag water quenching chamber.

[0008] As an optimized solution of the above-mentioned composite water quenching device for molten iron slag in blast furnace, the iron slag throwing wheel includes a cylindrical rotating body and several blades distributed around the circumference of the rotating body, with each blade distributed along the axial direction of the rotating body; the rotating body is driven to rotate by a drive shaft, and the two ends of the drive shaft are rotatably supported on the operating platform.

[0009] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnace, a drive gear is provided on at least one side of the drive shaft. The drive gear meshes with a transmission gear to transmit the rotational power of the power mechanism to the drive shaft. Protective covers are provided at both ends of the axial direction of the rotor body to place most of the drive shaft, the drive gear and the transmission gear inside the protective covers.

[0010] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnace, the blade is rectangular, and the surface in contact with the iron slag is an arc-shaped flying slope with a high center and low sides. The thickness of the blade gradually decreases from the end in contact with the rotor body to the edge.

[0011] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnace, at least two layers of water vapor interception mechanisms are provided above the iron slag water quenching chamber, and each layer of water vapor interception mechanism gradually decreases from the center to the edge; several liquid collection mechanisms are provided at the edge of each layer of water vapor interception mechanism.

[0012] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnaces, the water vapor interception mechanism is equipped with at least one suspension rod, the top of which is fixedly connected to the top of the iron slag water quenching chamber.

[0013] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnaces, the water vapor interception mechanism is a multi-layer mesh structure, including a water-absorbing net made of polymer water-absorbing fibers and a metal wire mesh layer attached to the upper and lower surfaces of the water-absorbing net.

[0014] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnaces, each of the liquid collection mechanisms includes a liquid guide plate vertically installed near the side wall of the iron slag water quenching chamber of the water vapor interception mechanism and a liquid collection pipe inclined through the side wall of the iron slag water quenching chamber. The bottom of the liquid guide plate is a V-shaped slope that slopes from both sides to the middle. The higher end of the liquid collection pipe has a liquid inlet hole corresponding to the V-shaped slope of the liquid guide plate, and the lower end of the liquid collection pipe is inserted into the collection pipe outside the iron slag water quenching chamber.

[0015] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnaces, a shielding cover is provided above the operating platform. The shielding cover is located below the iron slag discharge ditch and forms a maintenance space on the operating platform.

[0016] As another optimized solution for the above-mentioned composite water quenching device for molten iron slag in blast furnaces, a slanted baffle is inclinedly installed above some of the atomizing water spray pipes.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) This utility model involves striking and launching iron slag into the air using an iron slag throwing wheel in a closed or semi-closed room. After passing through a water mist layer and cooling down, the molten iron slag falls into a water quenching tank, thus rapidly cooling it down into small-particle iron slag. Compared to direct water quenching, this method effectively improves the efficiency of water quenching and reduces water consumption to some extent. With at least two water mist layers at different heights within the water quenching chamber, the iron slag, after being thrown, rises and then falls freely, repeatedly passing through the water mist layer, achieving rapid cooling before finally falling into the water quenching tank. This ensures thorough water quenching and, compared to direct water quenching, effectively improves the efficiency of water quenching and reduces water consumption to some extent.

[0019] 2) The blades of the slag throwing wheel of this utility model adopt an arc-shaped impact slope, and the thickness gradually decreases from the end in contact with the wheel body to the edge, which can make the slag thrown by different positions of the blades spread in all directions, thereby fully dispersing a clump of slag and preventing the slag from agglomerating and accumulating at the landing point.

[0020] 3) The water vapor interception mechanism set in the iron slag water quenching chamber of this utility model can absorb and liquefy most of the water vapor generated at high temperature, and then discharge it separately by means of the liquid collection mechanism, thereby minimizing the corrosion of the equipment by harmful substances in the high temperature steam. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 A schematic diagram of the transmission structure of a slag throwing flywheel;

[0023] Figure 3 A schematic diagram of the end face of the slag throwing flywheel;

[0024] Figure 4 A schematic diagram of the cross-section of the flywheel blades for iron slag throwing;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the water vapor interception mechanism;

[0026] Figure 6 This is a schematic diagram of the liquid collection mechanism;

[0027] Reference numerals: 1. Water quenching pool; 2. Iron slag water quenching chamber; 201. Atomizing water spray pipe; 202. Inclined baffle; 203. Operating platform; 204. Protective cover; 205. Shielding cover; 206. Maintenance space; 3. Iron slag discharge ditch; 4. Iron slag throwing wheel; 401. Blade; 402. Rotary wheel body; 403. Drive shaft; 404. Drive gear; 405. Transmission gear; 406. Throwing slope; 5. Water vapor interception mechanism; 501. Metal wire mesh layer; 502. Water absorption net; 503. Suspension rod; 6. Liquid collection mechanism; 601. Liquid collection pipe; 602. Liquid guide plate; 603. Collection pipe; 604. Liquid inlet. Detailed Implementation

[0028] The technical solution of this utility model will be described in detail below with reference to specific embodiments. Parts not explained in the following embodiments of this utility model are considered to be prior art known or should be known by those skilled in the art.

[0029] Example 1

[0030] A composite water quenching device for blast furnace molten iron slag, such as Figure 1As shown, the furnace includes a closed or semi-closed slag quenching chamber 2 and a quenching pool 1 at the bottom of the slag quenching chamber 2. The quenching pool 1 is constructed with cement masonry. The slag quenching chamber 2 is a closed or semi-closed workshop. The size of the quenching pool 1 is designed according to the capacity of the blast furnace and the amount of slag produced. The area and height of the slag quenching chamber 2, the rotation speed of the slag throwing wheel 4, and the amount of slag produced are also designed. Multiple underwater chain conveyors can be installed underwater in the quenching pool 1, arranged in parallel to cover the surface. At the bottom of the slag water quenching chamber 2, a slag receiving and conveying system is installed to receive and transport the slag out of the chamber. Simultaneously, at the tail end of these chain conveyors, an inclined chain conveyor is installed, perpendicular to and below all the chain conveyors, so that all the discharged slag collects on the inclined chain conveyor and is then transported out for centralized processing. On one side of the slag water quenching chamber 2, a slag discharge ditch 3 is provided, communicating with the blast furnace slag discharge port. The slag discharge ditch 3 is formed by casting refractory material, communicating with the blast furnace slag discharge port, and is inclined downwards. To facilitate the smooth flow of iron slag within the quenching chamber and provide it with an initial horizontal velocity, an operating platform 203 is installed on one side of the iron slag water quenching chamber 2. The operating platform 203 is equipped with an iron slag throwing wheel 4, which is driven by a power mechanism and positioned on the iron slag discharge trajectory of the iron slag discharge ditch 3. During rotation, the iron slag throwing wheel 4 tilts and strikes the iron slag discharged from the iron slag discharge ditch 3 upwards, throwing it through at least two layers of water mist before it falls freely into the water quenching pool 1. Each layer of water mist is distributed within the iron slag water... The cooling water layer formed by the collision of cooling water sprayed from a ring of atomizing water nozzles 201 at the same height in the quenching chamber 2. The atomizing water nozzles 201 use existing nozzles to spray cooling water horizontally or slightly upward. The size of the nozzles can be adjusted according to the actual situation to control the amount of cooling water sprayed, so as to achieve water conservation while ensuring the formation of a water mist layer. An inclined baffle 202 is set above each atomizing water nozzle 201, mainly to prevent iron slag falling freely from a height from adhering to the nozzle and thus clogging it.

[0031] In this embodiment, a shielding cover 205 is provided above the operating platform 203. The shielding cover 205 is located below the slag discharge ditch 3 and forms an inspection space 206 on the operating platform 203. An access passage is provided on the wall corresponding to the inspection space 206.

[0032] In this embodiment, several additional cooling water pools can be added to circulate with the cooling water in the water quenching pool 1 to improve the heat dissipation rate of the cooling water in the water quenching pool 1.

[0033] In this embodiment, as Figure 2 , Figure 3 and Figure 4As shown, the slag throwing wheel 4 includes a cylindrical rotating body 402 and several blades 401 distributed around the circumference of the rotating body 402. The rotating body 402 and the blades 401 are made of high-temperature resistant and wear-resistant steel. The rotating body 402 has a certain length along its axial direction, which is greater than the width of the slag distribution when it falls, and is generally at least 1.5 times its distribution width. The number of blades 401 is generally 6-12, and each blade 401 is distributed along the axial direction of the rotating body 402. The rotating body 402 is driven to rotate by a drive shaft 403. The two ends of the drive shaft 403 are rotatably supported on the operating platform 203 by existing equipment such as bearings and bearing seats.

[0034] like Figure 2 As shown, a drive gear 404 is fixedly installed on one side of the drive shaft 403. The drive gear 404 meshes with a transmission gear 405 to transmit the rotational power of the power mechanism to the drive shaft 403. The power mechanism is a motor-driven reducer. Protective covers 204 are provided at both ends of the axial direction of the wheel body 402 to house most of the drive shaft 403, the drive gear 404, and the transmission gear 405 within the protective covers 204. The protective covers 204 are made of metal and are intended to prevent iron slag from adhering to and corroding the equipment.

[0035] In this embodiment, the blade 401 is preferably rectangular in shape, such as... Figure 3 and Figure 4 As shown, one surface in contact with the iron slag is an arc-shaped knockdown slope 406. The knockdown slope 406 forms an arc-shaped surface that is high in the middle and low on both sides from both sides in the axial direction of the rotor body 402 toward the center. The other surface of the blade 401 opposite to the knockdown slope 406 can be a plane or an arc surface. At the same time, the thickness of the blade 401 gradually decreases from the side in contact with the rotor body 402 toward the edge.

[0036] The above are the basic embodiments of this utility model. Further improvements and optimizations can be made based on the above to obtain the following embodiments:

[0037] Example 2

[0038] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the difference lies in: Figure 1 As shown, at least two layers of water vapor interception mechanisms 5 are provided above the iron slag water quenching chamber 2, and each layer of water vapor interception mechanism 5 gradually decreases from the center to the edge. At least one suspension rod 503 connected to the roof is provided at the center to suspend the water vapor interception mechanism 5. Suspension rods 503 can be provided at other positions according to the actual situation. Several liquid collection mechanisms 6 are provided at the edge of each layer of water vapor interception mechanism 5.

[0039] In this embodiment, the water vapor interception mechanism 5 is a multi-layered mesh structure, such as... Figure 5 As shown, it includes a water-absorbing net 502 made of superabsorbent polymer fibers and a metal wire mesh layer 501 attached to the upper and lower surfaces of the water-absorbing net 502. The water-absorbing net 502 is a mesh structure with a certain thickness, generally about 1 cm, formed by stacking many layers of water-absorbing fiber mesh. The metal wire mesh layer 501 is also a mesh structure with a certain thickness, formed by stacking many layers of woven metal wires, but its thickness is less than that of the water-absorbing net 502. It is not only used to support the weight of the water-absorbing net 502, but more importantly, it guides the formation of water droplets absorbed and condensed by the water-absorbing net 502.

[0040] like Figure 6 As shown, each of the liquid collection mechanisms 6 includes a liquid guide plate 602 vertically installed on the side wall of the water vapor interception mechanism 5 near the iron slag water quenching chamber 2 and a liquid collection pipe 601 inclined through the side wall of the iron slag water quenching chamber 2. The bottom of the liquid guide plate 602 is a V-shaped slope that slopes from both sides to the middle. The higher end of the liquid collection pipe 601 has an inlet hole 604 corresponding to the lowest point of the V-shaped slope at the bottom of the liquid guide plate 602. The lower end of the liquid collection pipe 601 is inserted into the collection pipe 603 outside the iron slag water quenching chamber 2. After the water absorption net 502 absorbs enough water vapor, the condensed water vapor flows downward along the metal wire mesh layer 501 and is blocked by the liquid guide plate 602 before flowing along the bottom of the liquid guide plate 602 into the liquid collection pipe 601. Finally, it is collected in the collection pipe 603 set around the outer side wall of the iron slag water quenching chamber 2, so that the harmful substances contained in the water vapor can be centrally treated.

[0041] Based on our company's needs for blast furnace slag treatment, this utility model details the slag treatment method:

[0042] During the ironmaking process, the blast furnace continuously discharges high-temperature iron slag. The closed blast furnace iron slag treatment system involved in this utility model mainly includes a water quenching tank 1 and an iron slag water quenching chamber 2. An iron slag discharge ditch 3 connected to the blast furnace slag discharge port is set on one side of the iron slag water quenching chamber 2. The iron slag discharged from the blast furnace enters the iron slag water quenching chamber 2 through the discharge ditch. A key component, an iron slag throwing wheel 4, is set on the iron slag discharge trajectory of the iron slag discharge ditch 3. During the rotation of the iron slag throwing wheel 4, it can throw the iron slag discharged from the iron slag discharge ditch 3 upward.

[0043] The blade 401 is designed as a rectangle, with the surface in contact with the slag being a high-slope surface 406 that slopes downwards from the center to the sides. The thickness of the blade 401 gradually decreases from the end in contact with the impeller body 402 towards the edge. This special shape design allows the slag to be thrown to different positions when it comes into contact with the blade 401, making full use of the space of the entire water quenching chamber, and ensuring full contact with the cooling water on the blade 401 during the throwing process, thus achieving a better cooling effect.

[0044] Inside the slag water quenching chamber 2, the slag throwing wheel 4 throws the slag upwards. The slag must rise through at least two layers of water mist before free-falling through these layers again, finally landing in the water quenching pool 1. Each layer of water mist is formed by the collision of cooling water sprayed from a ring of atomized water nozzles 201 distributed at the same height within the slag water quenching chamber 2. This multi-layered water mist design further enhances the cooling effect on the slag, ensuring that the slag is fully cooled before falling into the water quenching pool 1.

[0045] At least two layers of water vapor interception mechanisms 5 are installed above the iron slag water quenching chamber 2, with each layer gradually decreasing in height from the center to the edge. Several liquid collection mechanisms 6 are installed at the edge of each layer of water vapor interception mechanism 5. The water vapor interception mechanism 5 has a multi-layered mesh structure, including a water-absorbing net 502 made of superabsorbent polymer fibers and metal wire mesh layers 501 attached to the upper and lower surfaces of the water-absorbing net 502. The water-absorbing net 502 made of superabsorbent polymer fibers can effectively absorb the water vapor generated during the iron slag water quenching process, while the metal wire mesh layer 501 enhances the structural strength and protects the water-absorbing net 502. Each liquid collection mechanism 6 includes a liquid guiding plate 602 vertically installed on the water vapor interception mechanism 5 near the side wall of the iron slag water quenching chamber 2 and a liquid collection pipe 601 inclined through the side wall of the iron slag water quenching chamber 2. The bottom of the liquid guiding plate 602 is a V-shaped slope that slopes from both sides towards the middle. The higher end of the liquid collecting pipe 601 has an inlet hole 604 corresponding to the V-shaped slope of the liquid guiding plate 602, and the lower end of the liquid collecting pipe 601 is inserted into the collection pipe 603 outside the iron slag water quenching chamber 2. When the water vapor interception mechanism 5 absorbs water vapor, the water vapor will gather into water droplets. The water droplets flow along the V-shaped slope of the liquid guiding plate 602 into the inlet hole 604 of the liquid collecting pipe 601, and then flow through the liquid collecting pipe 601 into the collection pipe 603, thereby achieving the collection and treatment of water vapor, preventing water vapor from escaping from the iron slag water quenching chamber 2, and reducing environmental pollution.

[0046] In actual operation, the high-temperature slag discharged from the blast furnace enters the slag water quenching chamber 2 through the slag discharge ditch 3. The slag throwing wheel 4 throws the slag upward, allowing it to pass through multiple layers of water mist for preliminary cooling. After preliminary cooling, the slag falls into the water quenching pool 1 to complete the water quenching process. Then, the water-quenched slag is conveyed out of the water quenching pool 1 by a chain conveyor.

[0047] The water vapor and harmful gases generated during the water quenching process of blast furnace slag are collected and treated by the water vapor interception mechanism 5 and the liquid collection mechanism 6. The entire system achieves efficient cooling and environmentally friendly treatment of blast furnace slag, improves the quality and efficiency of slag treatment, reduces production costs, and minimizes environmental pollution.

Claims

1. A composite water quenching device for blast furnace molten iron slag, comprising a closed or semi-closed iron slag water quenching chamber (2) and a water quenching pool (1) at the bottom of the iron slag water quenching chamber (2), wherein an iron slag discharge ditch (3) communicating with the blast furnace slag discharge port is provided on one side of the iron slag water quenching chamber (2), characterized in that: An operating platform (203) is set on one side of the slag water quenching chamber (2). The operating platform (203) is equipped with a slag throwing wheel (4) driven by a power mechanism. The slag throwing wheel (4) is located on the slag discharge trajectory of the slag discharge ditch (3) so that the slag throwing wheel (4) will hit and throw the slag discharged from the slag discharge ditch (3) upward during the rotation process, and fall into the water quenching pool (1) after passing through at least two layers of water mist. Each layer of water mist is formed by the collision of cooling water sprayed by a ring of atomized water spray pipes (201) distributed at the same height in the slag water quenching chamber (2).

2. The composite water quenching device for blast furnace molten iron slag according to claim 1, characterized in that: The slag throwing flywheel (4) includes a cylindrical rotating body (402) and several blades (401) distributed around the circumference of the rotating body (402), with each blade (401) distributed along the axial direction of the rotating body (402); the rotating body (402) is driven to rotate by a drive shaft (403), with both ends of the drive shaft (403) rotatably supported on the operating platform (203).

3. The composite water quenching device for blast furnace molten iron slag according to claim 2, characterized in that: A drive gear (404) is provided on at least one side of the drive shaft (403), which meshes with a transmission gear (405) to transmit the rotational power of the power mechanism to the drive shaft (403); a protective cover (204) is provided at both ends of the axial direction of the wheel body (402) to place most of the drive shaft (403), the drive gear (404) and the transmission gear (405) inside the protective cover (204).

4. The composite water quenching device for blast furnace molten iron slag according to claim 2, characterized in that: The blade (401) is rectangular, and the surface in contact with the iron slag is an arc-shaped impact slope (406) that is high in the middle and low on both sides. The thickness of the blade (401) gradually decreases from the end in contact with the rotor body (402) towards the edge.

5. The composite water quenching device for blast furnace molten iron slag according to claim 1, characterized in that: The iron slag water quenching chamber (2) is provided with at least two layers of water vapor interception mechanism (5) above it, and each layer of water vapor interception mechanism (5) gradually decreases from the center to the edge; several liquid collection mechanisms (6) are provided at the edge of each layer of water vapor interception mechanism (5).

6. The composite water quenching device for blast furnace molten iron slag according to claim 5, characterized in that: The water vapor interception mechanism (5) is provided with at least one suspension rod (503), and the top end of the suspension rod (503) is fixedly connected to the top of the slag water quenching chamber (2).

7. The composite water quenching device for blast furnace molten iron slag according to claim 5, characterized in that: The water vapor interception mechanism (5) is a multi-layer mesh structure, including a water-absorbing net (502) made of polymer water-absorbing fiber and a metal wire mesh layer (501) attached to the upper and lower surfaces of the water-absorbing net (502).

8. A composite water quenching device for blast furnace molten iron slag according to claim 5, characterized in that: Each of the liquid collection mechanisms (6) includes a liquid guide plate (602) vertically installed on the side wall of the water vapor interception mechanism (5) near the iron slag water quenching chamber (2) and a liquid collection pipe (601) inclined through the side wall of the iron slag water quenching chamber (2). The bottom of the liquid guide plate (602) is a V-shaped slope that slopes from both sides to the middle. The higher end of the liquid collection pipe (601) has a liquid inlet hole (604) corresponding to the V-shaped slope of the liquid guide plate (602). The lower end of the liquid collection pipe (601) is inserted into the collection pipe (603) outside the iron slag water quenching chamber (2).

9. A composite water quenching device for blast furnace molten iron slag according to claim 1, characterized in that: A shield (205) is provided above the operating platform (203). The shield (205) is located below the slag discharge ditch (3) and forms a maintenance space (206) on the operating platform (203).

10. A composite water quenching device for blast furnace molten iron slag according to claim 1, characterized in that: An inclined baffle (202) is provided above part of the atomizing water spray pipe (201).

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