A cooling classification device

Abstract

A cooling grading device, which comprises a strip grid and a hopper. The strip grid is laid by a plurality of grid rods in the same plane, and a grid hole is left between any two adjacent grid rods. The grid rod is a hollow structure, and a grid rod cooling medium inlet and a grid rod cooling medium outlet are arranged on the grid rod and communicated with the inner cavity of the grid rod. The grid rod cooling medium inlet is communicated with an external cooling medium source through a cooling medium conveying pipeline. The hopper is vertically arranged, and a feeding port is arranged at the top of the hopper, and a discharging port is arranged at the bottom of the hopper. The strip grid is arranged above the feeding port of the hopper. The utility model sets the strip grid above the hopper and introduces the cooling medium into the interior of the strip grid, avoids the large block material from falling into the hopper, causes the subsequent device to block the material, and simultaneously rapidly cools the material contact surface through the low-temperature pipeline, reduces the probability that the material is bonded on the surface of the strip grid to form the blocked material.

Description

Technical Field

[0001] This utility model relates to a cooling device, specifically a cooling grading device, belonging to the field of metallurgical cooling technology. Background Technology

[0002] Various zinc- and iron-containing dust and sludge from the steel industry, including sintering dust, blast furnace bag filter dust, blast furnace gravity dust, electric furnace dust, steelmaking sludge, and converter dust, have high valuable metal content and high recycling value. Their main chemical components include Fe, Zn, C, Ca, Mg, Si, and Al. Fe and C are the main materials and energy components in steelmaking, while Ca and Mg are solvent components and can be recycled and reused in the steelmaking process. However, because zinc is a harmful element in the steelmaking process, it is not suitable as a direct raw material. Therefore, zinc-containing dust and sludge are usually pre-dezincified.

[0003] In the existing pretreatment of zinc-containing dust and sludge for zinc removal, the rotary kiln process is usually adopted. After mixing and pelletizing, the slag is subjected to high-temperature roasting in the rotary kiln, and the slag falls from the slag outlet at the kiln head and enters the slag treatment process.

[0004] The slag treatment process generally uses water quenching. High-temperature slag falls from the kiln into the slag flushing chute, is then flushed into the slag flushing pool by water quenching, and is retrieved by a crane grab bucket. This water quenching slag retrieval method can quickly cool the blast furnace slag, with a significant slag cooling effect. However, its disadvantages are also obvious: ① The slag has a high moisture content, making transportation difficult and the working environment along the way is poor. If the slag is utilized, it cannot meet the dry slag requirements of subsequent processes; ② It generates a large amount of water vapor, resulting in a poor on-site environment and high water consumption; ③ The water in the water quenching pool is difficult to treat, requiring the use of sedimentation and clarification pools for recycling, which occupies a large area and involves a large amount of civil engineering work; ④ The waste heat of the slag cannot be utilized; ⑤ The kiln slag is not classified by particle size, and large particles of kiln slag are prone to clogging and difficult to cool in subsequent equipment, and it is also not conducive to the reuse of kiln slag. Utility Model Content

[0005] To address the problems in existing technologies, such as the lack of particle size classification of kiln slag, easy clogging of kiln slag, the generation of large amounts of water vapor from high-temperature kiln slag, and the difficulty in treating the solution in the water quenching tank, this utility model proposes a cooling and grading device. It is equipped with a grid and a hopper, and a cooling medium is introduced into the grid. While screening the high-temperature kiln slag, it also cools it, blocking large pieces of kiln slag outside the hopper and subsequent devices to prevent clogging. At the same time, it adopts an indirect heat exchange mode, which saves on the civil engineering investment of water quenching tanks, sedimentation tanks, etc., optimizes the site environment, and saves water for water quenching.

[0006] According to the first embodiment of the present invention, a cooling grading device is provided.

[0007] A cooling and grading device includes a grid and a hopper. The grid is composed of multiple grid bars laid in the same plane, with grid holes between any two adjacent grid bars. Each grid bar is hollow and has a cooling medium inlet and an outlet communicating with its internal cavity. The cooling medium inlet is connected to an external cooling medium source via a cooling medium delivery pipe. The hopper is vertically positioned, with a feed inlet at the top and a discharge outlet at the bottom. The grid covers the feed inlet of the hopper.

[0008] Preferably, the multiple grid bars are arranged in a parallel manner.

[0009] Preferably, the grid bars are straight or S-shaped, with straight bars being the preferred type.

[0010] Preferably, in the plurality of grid bars, the grid cooling medium inlet of any one grid bar is connected to an external cooling medium source, and the grid cooling medium outlet is connected to the grid cooling medium inlet of another grid bar, and so on, until the grid cooling medium outlet of the last grid bar is connected to the outside. Preferably, the grid bar connected to the external cooling medium source is located at the edge of the grid bar.

[0011] Preferably, the cooling medium inlets of the multiple grid bars are all directly connected to the cooling medium delivery pipeline, and are connected to an external cooling medium source through the cooling medium delivery pipeline.

[0012] Preferably, the hopper wall has a cavity on its side, and a cooling medium inlet and an outlet connected to the cavity are formed on the hopper wall. The cooling medium inlet is connected to an external cooling medium source via a cooling medium delivery pipe. Preferably, the cooling medium inlet is located at the lower part of the hopper wall, and the cooling medium outlet is located at the upper part of the hopper wall.

[0013] Preferably, the cooling medium outlet of the bucket wall is connected to the cooling medium inlet of each grid bar through multiple cooling medium delivery pipes.

[0014] Preferably, the hopper wall on the side closest to the bar grid feeding position is vertically arranged. The hopper wall on the side furthest from the bar grid feeding position slopes inward from top to bottom, with an angle of 10~60° with the vertical direction, preferably 15~45°.

[0015] Preferably, the grid also includes multiple longitudinal bars that intersect with the grid bars. Preferably, the longitudinal bars and the grid bars are arranged perpendicular to each other.

[0016] Preferably, the longitudinal bar and the grid bar are movably connected, preferably through a slide rail and a slider.

[0017] Preferably, the device further includes a cooling tank. Depending on the discharge location of the large particles from the grid, the cooling tank is located below the discharge location and has an open structure with an open top. Preferably, the bottom or lower part of the side wall of the cooling tank has a coolant inlet and a coolant outlet.

[0018] Preferably, the apparatus further includes a rotary kiln. The discharge port of the rotary kiln is located above the bar screen. The bar screen is inclined. Preferably, the direction of the higher end of the bar screen is adjustable.

[0019] Preferably, the surface of the grid is coated with a high-temperature resistant coating.

[0020] In this invention, a grid is installed above the hopper, with a cooling medium inlet and outlet. Cooling medium is introduced into the hollow structure inside the grid, achieving both screening and cooling simultaneously. This reduces the probability of material blockage in subsequent processes. Simultaneously, the cooling medium lowers the surface temperature of the grid, and the low-temperature pipe rapidly cools the material contact surface, further reducing the probability of material adhering to the grid surface and causing blockages.

[0021] In this invention, there are multiple ways to connect the grid bars to the cooling medium conveying pipeline. For example, any one grid bar can be connected to the cooling medium conveying pipeline, and then the cooling medium outlet of one grid bar can be connected to the cooling medium inlet of another grid bar, thus achieving a series connection of all grid bars. Alternatively, the grid bars can be connected to the cooling medium conveying pipeline in parallel, that is, multiple grid bars can be directly connected to the cooling medium conveying pipeline simultaneously.

[0022] In this invention, a clamping cavity is further provided on the side wall of the hopper, and a cooling medium is introduced into the clamping cavity. This prevents the material from sticking to the inner side wall of the hopper and provides secondary cooling for the material in the hopper. Preferably, the cooling medium outlet of the hopper is connected to the cooling medium inlet of the grid bar to achieve full utilization of the cooling medium.

[0023] In this invention, the hopper wall on the side closest to the bar grid feeding position is vertically positioned, effectively preventing material accumulation. The hopper wall on the side furthest from the bar grid feeding position can have a certain angle, increasing the collection area at the top of the hopper.

[0024] In this invention, the grid can also be provided with longitudinal bars intersecting the grid rods to reinforce the overall structure of the grid. Preferably, the grid rods and longitudinal bars are movably connected, allowing the spacing between the grid rods and the spacing between the vertical bars to be freely adjusted according to the particle size of the material in actual application and the particle size requirements of subsequent devices, thus expanding the application range of the device.

[0025] In this invention, a cooling pool is provided below the discharge position of large particles in the bar screen. Large particles falling from the upper part of the bar screen into the cooling pool can be rapidly cooled and broken into smaller particles, reducing the subsequent crushing workload. At the same time, the large particles are fully cooled.

[0026] In this invention, the bar grid is inclined, and preferably, the direction of the higher section of the bar grid is adjustable. In practical applications, the direction of the higher side of the bar grid is consistent with the direction of material movement driven by the rotation of the rotary kiln, so that the discharge from the rotary kiln is concentrated on the bar grid as much as possible, while extending the screening distance of the material. Correspondingly, if the rotation direction of the rotary kiln changes, the inclination direction of the bar grid also changes accordingly.

[0027] In this invention, the adjustable height of the grid strip can be achieved in various ways, such as fixing a fixed rod to the ground or hopper, and then connecting the fixed rod and the grid strip through a rotatable connecting structure to achieve adjustable height. The rotatable connecting structure includes, but is not limited to, rotary joints and hinge connections.

[0028] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a cooling and grading device, which sets up a grid above the hopper and introduces a cooling medium into the grid to prevent large pieces of material from falling into the hopper and causing blockage in subsequent devices. At the same time, the material contact surface is rapidly cooled through a low-temperature pipe to reduce the probability of material adhering to the grid surface and causing blockage.

[0029] 2. The cooling and grading device provided by this utility model achieves rapid grading and preliminary cooling of materials by setting a clamping cavity on the side wall of the hopper to avoid material adhesion, and by designing the inclination direction of the two sides of the hopper wall and the inclination direction of the grid, and also avoids material adhesion. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a cooling grading device provided by the present invention.

[0031] Figure 2 A side view of a cooling grading device provided by this utility model.

[0032] Figure 3 This is a schematic diagram of the structure of the bar grid in a cooling grading device provided by this utility model.

[0033] Reference numerals in the attached drawings: 1: bar grid; 101: grid bar; 102: grid hole; 103: longitudinal bar; 2: hopper; 3: cooling pool; 4: rotary kiln. Detailed Implementation

[0034] The technical solution of this utility model is illustrated below. The scope of protection of this utility model includes, but is not limited to, the following embodiments.

[0035] According to an embodiment of the present invention, a cooling grading device is provided.

[0036] A cooling and grading device includes a grid 1 and a hopper 2. The grid 1 is formed by multiple grid bars 101 laid in the same plane, with grid holes 102 between any two adjacent grid bars 101. Each grid bar 101 is hollow and has a cooling medium inlet and a cooling medium outlet communicating with its inner cavity. The cooling medium inlet is connected to an external cooling medium source via a cooling medium delivery pipe. The hopper 2 is vertically arranged, with a feed inlet at the top and a discharge outlet at the bottom. The grid 1 covers the feed inlet of the hopper 2.

[0037] Preferably, the multiple grid bars 101 are arranged in a parallel manner.

[0038] Preferably, the gate bar 101 is a straight structure or an S-shaped structure, and preferably a straight structure.

[0039] Preferably, in the plurality of grid bars 101, the grid cooling medium inlet of any one grid bar 101 is connected to an external cooling medium source, and the grid cooling medium outlet is connected to the grid cooling medium inlet of another grid bar 101, and so on, until the grid cooling medium outlet of the last grid bar 101 is connected to the outside. Preferably, the grid bar 101 connected to the external cooling medium source is located at the edge of the grid bar 1.

[0040] Preferably, the cooling medium inlets of the multiple grid bars 101 are all directly connected to the cooling medium delivery pipe, and are connected to an external cooling medium source through the cooling medium delivery pipe.

[0041] Preferably, the hopper 2 has a cavity on its side wall, and a cooling medium inlet and a cooling medium outlet communicating with the cavity are formed on the hopper wall. The cooling medium inlet is connected to an external cooling medium source through a cooling medium conveying pipe. Preferably, the cooling medium inlet is located at the lower part of the hopper wall of the hopper 2, and the cooling medium outlet is located at the upper part of the hopper wall of the hopper 2.

[0042] Preferably, the cooling medium outlet of the bucket wall is connected to the cooling medium inlet of each grid bar through multiple cooling medium delivery pipes.

[0043] Preferably, the hopper wall of the hopper 2 is vertically arranged on the side closest to the bar feed position. The hopper wall of the hopper 2 on the side furthest from the bar feed position slopes inward from top to bottom, with an angle of 10~60° with the vertical direction, preferably 15~45°.

[0044] Preferably, the grid 1 further includes multiple longitudinal bars 103 that intersect with the grid bars. Preferably, the longitudinal bars 103 and the grid bars are arranged perpendicular to each other.

[0045] Preferably, the longitudinal bar 103 is movably connected to the grid bar, preferably via a slide rail and a slider.

[0046] Preferably, the device further includes a cooling tank 3. Depending on the discharge location of large particles in the grid 1, the cooling tank 3 is located below the discharge location of the large particles, and the cooling tank 3 is an open structure with an open top. Preferably, the bottom or lower part of the side wall of the cooling tank 3 is provided with a coolant inlet and a coolant outlet.

[0047] Preferably, the apparatus further includes a rotary kiln 4. The discharge port of the rotary kiln 4 is located above the bar screen 1. The bar screen 1 is inclined. Preferably, the direction of the higher end of the bar screen 1 is adjustable.

[0048] Preferably, the surface of the grid 1 is coated with a high-temperature resistant coating. Example 1

[0049] A cooling and grading device includes a grid 1 and a hopper 2. The grid 1 consists of six grid bars 101 laid out in the same plane, with grid holes 102 between any two adjacent grid bars 101. Each grid bar 101 is hollow and has a cooling medium inlet and a cooling medium outlet communicating with its inner cavity. The cooling medium inlet is connected to an external cooling medium source via a cooling medium delivery pipe. The hopper 2 is vertically arranged, with a feed inlet at the top and a discharge outlet at the bottom. The grid 1 covers the feed inlet of the hopper 2. Example 2

[0050] The same applies to Embodiment 1, except that the six grid bars 101 are arranged in a parallel manner. Example 3

[0051] Repeat Example 2, except that the gate bar 101 is a straight structure. Example 4

[0052] Repeat Example 3, except that among the six grid bars 101, the grid bar cooling medium inlet of the grid bar 101 located at the edge of the grid bar 1 is connected to an external cooling medium source, and the grid bar cooling medium outlet is connected to the grid bar cooling medium inlet of another grid bar 101, and so on until the grid bar cooling medium outlet of the last grid bar 101 is connected to the outside. Example 5

[0053] Example 3 is repeated, except that the cooling medium inlets of the six grid bars 101 are all directly connected to the cooling medium conveying pipe, and are connected to an external cooling medium source through the cooling medium conveying pipe. Example 6

[0054] The embodiment 5 is repeated, except that the side of the hopper wall of the hopper 2 is provided with a cavity, and a hopper wall cooling medium inlet and a hopper wall cooling medium outlet are provided on the hopper wall and communicate with the cavity. The hopper wall cooling medium inlet is connected to an external cooling medium source through a cooling medium conveying pipe. The hopper wall cooling medium inlet is located at the lower part of the hopper wall of the hopper 2, and the hopper wall cooling medium outlet is located at the upper part of the hopper wall of the hopper 2. Example 7

[0055] Repeat Example 6, except that the cooling medium outlet of the bucket wall is connected to the cooling medium inlet of each grid bar through 6 cooling medium delivery pipes. Example 8

[0056] Example 7 is repeated, except that the hopper wall of hopper 2 on the side near the bar feed position is vertically arranged. The hopper wall on the side away from the bar feed position of hopper 2 is inclined inward from top to bottom, and the angle between it and the vertical direction is 30°. Example 9

[0057] The embodiment 8 is repeated, except that the grid 1 further includes multiple longitudinal bars that intersect with the grid bars. The longitudinal bars and the grid bars are arranged perpendicular to each other.

[0058] The vertical rod and the grid rod are movably connected, preferably by a slide rail and a slider. Example 10

[0059] The same method is used in embodiment 9, except that the device also includes a cooling tank 3. Based on the discharge position of large particles in the grid 1, the cooling tank 3 is located below the discharge position of the large particles, and the cooling tank 3 is an open structure with an open top. The bottom of the cooling tank 3 has a coolant inlet and a coolant outlet. Example 11

[0060] The apparatus is repeated in Embodiment 10, except that it further includes a rotary kiln 4. The discharge port of the rotary kiln 4 is located above the bar screen 1. The bar screen 1 is inclined. The direction of the higher end of the bar screen 1 is adjustable. Example 12

[0061] Example 11 is repeated, except that the surface of the grid 1 is coated with a high-temperature resistant coating.

[0062] The process of treating kiln slag using a cooling and grading device as described in Example 12 is as follows: Cooling medium is introduced into the hopper clamping cavity through the hopper cooling medium inlet. After passing through the clamping cavity, the cooling medium enters the inside of the grid and is finally discharged from the grid cooling medium outlet.

[0063] The slag is discharged from the discharge port of the rotary kiln onto the bar screen. Large slag particles roll down the bar screen into the cooling pool, while small slag particles fall from the screen holes into the hopper and are eventually discharged from the discharge port at the bottom of the hopper.

Claims

1. A cooling grading device, characterized in that: The device includes a grid (1) and a hopper (2); the grid (1) is formed by laying multiple grid rods (101) in the same plane, and a grid hole (102) is left between any two adjacent grid rods (101); wherein, the grid rod (101) is a hollow structure, and a grid cooling medium inlet and a grid cooling medium outlet are opened on the grid rod (101) and communicate with its inner cavity, and the grid cooling medium inlet is connected to an external cooling medium source through a cooling medium conveying pipe; the hopper (2) is set vertically, and a feed inlet is opened at the top of the hopper (2) and a discharge outlet is opened at the bottom of the hopper (2); the grid (1) covers the feed inlet of the hopper (2).

2. The apparatus according to claim 1, characterized in that: The multiple grid bars (101) are arranged in a parallel manner.

3. The apparatus according to claim 2, characterized in that: The fence bar (101) is a straight structure or an S-shaped structure.

4. The apparatus according to claim 1, characterized in that: In the plurality of grid bars (101), the grid cooling medium inlet of any one grid bar (101) is connected to an external cooling medium source, and the grid cooling medium outlet is connected to the grid cooling medium inlet of another grid bar (101), and so on until the grid cooling medium outlet of the last grid bar (101) is connected to the outside.

5. The apparatus according to claim 4, characterized in that: The grid bar (101) connected to the external cooling medium source is located at the edge of the grid (1); or The cooling medium inlets of the multiple grid bars (101) are all directly connected to the cooling medium conveying pipes, and are connected to an external cooling medium source through the cooling medium conveying pipes.

6. The apparatus according to claim 1, characterized in that: The hopper (2) has a clamping cavity on the side of the hopper wall, and a hopper wall cooling medium inlet and a hopper wall cooling medium outlet connected to the clamping cavity are provided on the hopper wall. The hopper wall cooling medium inlet is connected to an external cooling medium source through a cooling medium conveying pipe.

7. The apparatus according to claim 6, characterized in that: The cooling medium inlet of the bucket wall is located at the lower part of the bucket wall of the hopper (2), and the cooling medium outlet of the bucket wall is located at the upper part of the bucket wall of the hopper (2).

8. The apparatus according to claim 7, characterized in that: The cooling medium outlet of the bucket wall is connected to the cooling medium inlet of each grid bar through multiple cooling medium delivery pipelines.

9. The apparatus according to claim 1, characterized in that: The hopper (2) has its wall set vertically on the side closest to the bar grid feeding position; the hopper (2) has its wall on the side furthest from the bar grid feeding position tilted inward from top to bottom, with an angle of 10~60° with the vertical direction.

10. The apparatus according to claim 1, characterized in that: The grid (1) also includes multiple longitudinal bars (103) that intersect with the grid bars.

11. The apparatus according to claim 10, characterized in that: The longitudinal bar (103) and the grid bar are set perpendicular to each other.

12. The apparatus according to claim 10, characterized in that: The longitudinal bar (103) is movably connected to the gate bar.

13. The apparatus according to claim 12, characterized in that: The longitudinal bar (103) is connected to the grid bar by a slide rail and a slider.

14. The apparatus according to claim 1, characterized in that: The device also includes a cooling pool (3); the cooling pool (3) is located below the discharge position of the large particles of the grid (1) and is an open structure with an open top.

15. The apparatus according to claim 14, characterized in that: The bottom or lower side wall of the cooling pool (3) is provided with a coolant inlet and a coolant outlet.

16. The apparatus according to claim 1, characterized in that: The device also includes a rotary kiln (4); the discharge port of the rotary kiln (4) is located above the bar grid (1); the bar grid (1) is inclined.

17. The apparatus according to claim 16, characterized in that: The direction of the higher end of the bar grid (1) is adjustable.

18. The apparatus according to any one of claims 1-17, characterized in that: The surface of the grid (1) is coated with a high-temperature resistant coating.

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