A slag-water separation device for blast furnace slag

Abstract

This utility model discloses a slag-water separation device for blast furnace slag, including a slag pool and a partition screen disposed on one side of the bottom of the slag pool. A filter screen is installed in the lower part of the slag pool, with its end connected to the upper end of the partition screen. A bottom mesh chain conveyor is installed above the filter screen. A relatively closed water storage cavity is formed between the filter screen, the partition screen, and the side wall of the slag pool. A slag discharge trough is formed in the internal space of the slag pool on the other side of the partition screen. An auger is installed in the slag discharge trough. A screw elevator is installed on the outside of the slag pool. The end of the slag discharge pipe is connected to the feed inlet at the bottom of the screw elevator. A slag discharge pipe is installed at the top of the screw elevator, with the slag discharge end extending into the upper part of the slag pool. A top mesh chain conveyor is installed in the slag pool below the slag discharge end of the slag discharge pipe, with the discharge end of the top mesh chain conveyor extending to the outside of the slag pool. In summary, this utility model has the advantages of high automation, high working efficiency, and good separation effect.

Description

Technical Field

[0001] This utility model relates to the technical field of slag-water separation equipment, specifically to a slag-water separation device for blast furnace slag. Background Technology

[0002] During blast furnace production, after the various raw materials and fuels are smelted, in addition to obtaining molten iron and blast furnace gas, the gangue from the iron ore and the ash from the fuel fuse with the flux to form liquid slag, which typically has a temperature of 1450–1550℃ and is discharged from the slag tap and taphole at regular intervals. Most blast furnace slag undergoes water quenching, using high-pressure water to crack and break it into water slag. Water slag is a byproduct of blast furnace ironmaking. After processing, the slag can be used to make slag cement or slag bricks and other building materials, or to manufacture slag wool, cast stone, or expanded balls. The water can be recycled, improving water resource utilization and reducing water pollution. To achieve this, it is necessary to first separate the blast furnace water slag from the slag.

[0003] Currently, the main equipment for separating blast furnace slag involves installing a filter screen at the outlet and manually operating a crane grab bucket to directly scoop the slag from the slag pool, pile it in a storage area for natural filtration and surface drying, and then transporting it off-site after dewatering. This method requires a crane and a large slag pool, where floating slag is difficult to grab. If the filter screen is not cleaned in time, the mesh can easily become clogged, posing a significant risk to subsequent water circulation processes. Workers must operate on-site, resulting in high labor intensity and low efficiency. Furthermore, the granulated slag is of varying sizes, leading to low separation efficiency and incomplete separation, increasingly failing to meet the needs of blast furnace manufacturers. Although foreign countries have developed slag separation equipment such as the Impa process, which uses large rotary drums for slag dewatering, the huge infrastructure investment and maintenance costs make it economically unsustainable for blast furnace manufacturers. Therefore, developing a highly automated, efficient, and effective slag-water separation device for blast furnace slag is objectively necessary. Utility Model Content

[0004] The purpose of this invention is to provide a slag-water separation device for blast furnace slag that has a high degree of automation, high working efficiency, and good separation effect.

[0005] The purpose of this utility model is achieved as follows: It includes a slag pool and a partition net installed on one side of the bottom of the slag pool. A filter net is installed in the lower part of the slag pool, with its end connected to the upper end of the partition net. A bottom mesh chain conveyor is installed above the filter net. A relatively closed water storage cavity is formed between the filter net, the partition net, and the side wall of the slag pool. A drain pipe is installed at the bottom of the water storage cavity. A slag discharge trough is formed in the internal space of the slag pool on the other side of the partition net. The bottom of the slag discharge trough is arc-shaped. An auger is installed in the slag discharge trough. A slag discharge pipe is installed on one side of the slag discharge trough, with the end of the auger extending into the slag discharge pipe. A screw elevator is installed on the outside of the slag pool. The end of the slag discharge pipe is connected to the feed inlet at the bottom of the screw elevator. A slag discharge pipe is installed at the top of the screw elevator, with the slag discharge end extending into the upper part of the slag pool. A top mesh chain conveyor is installed in the slag pool below the slag discharge end of the slag discharge pipe, with the discharge end of the top mesh chain conveyor extending to the outside of the slag pool.

[0006] Furthermore, the slag discharge end of the slag discharge pipe is set at an angle downwards.

[0007] Furthermore, a water slag conveyor is installed below the discharge end of the top mesh chain conveyor.

[0008] Furthermore, the bottom mesh conveyor is provided with several horizontal plates spaced apart along its length, with the ends of the horizontal plates closely attached to the upper surface of the filter screen.

[0009] Furthermore, a vibrating plate is inclinedly installed on the slag pool below the slag discharge end of the slag discharge pipe.

[0010] Furthermore, a filtration sedimentation tank and a water storage tank are installed sequentially on the drainage pipe, and the water storage tank is connected to the sludge tank through a pipeline.

[0011] Furthermore, both sides of the top mesh conveyor are equipped with skirt-type side guards.

[0012] Furthermore, the mesh diameter of the bottom mesh conveyor is larger than that of the filter screen.

[0013] This invention relates to the separation of slag and water in blast furnace slag. In use, the slag is introduced into a slag pool for cracking and water quenching, forming slag particles of varying sizes. The slag continuously settles to the bottom of the pool. A bottom mesh conveyor is activated, and after the slag settles, the particles are transported by the bottom mesh conveyor to the slag discharge trough. Water passes through the bottom mesh conveyor and a filter screen before entering the water storage chamber. An auger is then activated to transport the slag and water in the slag discharge trough. The slag is then fed into a screw conveyor via a slag discharge pipe. The spiral elevator conveys the slag upwards. When the slag particles are higher than the water surface in the slag pool, the slag separates from the water and falls through the slag discharge pipe onto the top mesh chain conveyor. Under the action of gravity, the slag spreads on the top mesh chain conveyor and is driven by it to filter out the water in the slag again. The water drips back into the slag pool, while the slag after being filtered again is transported out of the slag pool by the top mesh chain conveyor, thus completing the slag-water separation of the blast furnace slag. In this invention, the conveying and filtration of water slag are both automated processes. Compared to the traditional manual operation of the overhead crane grab bucket, this invention eliminates the need for manual slag handling, achieving a high degree of automation. The entire slag-water separation process is automatic and continuous, resulting in high work efficiency. Secondly, during slag-water separation, the bottom mesh conveyor filters the water slag, while a filter screen simultaneously filters the water slag. After two filtrations, the water enters the storage chamber, is discharged after water quenching, and the water slag is sequentially fed into the slag discharge trough and the screw conveyor. When the water slag height is higher than the liquid level... The water in the slag is drained, completing one stage of slag-water separation. The slag is then sent to a top mesh conveyor. During transport, the water in the slag is separated again and returned to the slag pool. This process drains the slag and reduces water waste. Simultaneously, after the slag water quenching process, the water level in the slag pool continuously decreases, causing the floating slag to sink and be carried away by the bottom mesh conveyor, achieving slag removal and demonstrating good slag-water separation. Finally, this invention has a relatively simple structure and operation, with low infrastructure investment and production maintenance costs, making it economically affordable for most blast furnace manufacturers. In summary, this invention has the advantages of high automation, high efficiency, and good separation effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0015] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0016] Figure 3 for Figure 1 A schematic diagram of the right-side view structure;

[0017] In the diagram: 1-Slag pool, 2-Blocking screen, 3-Filter screen, 4-Bottom mesh chain conveyor, 5-Water storage chamber, 6-Slag discharge trough, 7-Auger, 8-Screw elevator, 9-Slag discharge pipe, 10-Top mesh chain conveyor, 11-Slag conveyor, 12-Horizontal plate, 13-Vibrating plate, 14-Drainage pipe, 15-Filtration sedimentation tank, 16-Water storage tank, 17-Skirt-type sidewall. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0019] like Figures 1-3 As shown, this utility model includes a slag pool 1 and a partition net 2 disposed on one side of the bottom of the slag pool 1. A filter net 3 is disposed in the lower part of the slag pool 1, and the end of the filter net 3 is connected to the upper end of the partition net 2. A bottom mesh chain conveyor 4 is disposed above the filter net 3. The bottom mesh chain conveyor 4 is an existing mesh chain conveyor with a mesh structure for conveying. In this utility model, the mesh structure is used to filter the slag. In this utility model, multiple mesh chain conveyors can be used in parallel, or a wider mesh chain conveyor can be used so that the width of the bottom mesh chain conveyor 4 is the same as that of the slag pool 1, thereby conveying away all the slag that falls to the bottom. A relatively closed water storage cavity 5 is formed between the filter net 3, the partition net 2, and the side wall of the slag pool 1. The slag pool 1 on the other side of the partition net 2... The internal space forms a slag discharge trough 6, the bottom of which is arc-shaped. An auger 7 is installed inside the slag discharge trough 6. The auger 7 is an existing structure, generally including a rotating shaft and spiral blades located on it. Driven by a motor, it can push the slag out. A slag discharge pipe is installed on one side of the slag discharge trough 6. The end of the auger 7 extends into the slag discharge pipe. A screw elevator 8 is installed on the outside of the slag pool 1. The screw elevator 8 is an existing device used to transport the slag to a higher position. The end of the slag discharge pipe is connected to the feed port at the bottom of the screw elevator 8. A slag discharge pipe 9 is installed on the upper part of the screw elevator 8. The slag discharge end of the slag discharge pipe 9 extends into the upper part of the slag pool 1. A top mesh chain conveyor 10 is installed in the slag pool 1 below the slag discharge end of the slag discharge pipe 9. The discharge end of the top mesh chain conveyor 10 extends to the outside of the slag pool 1. The top mesh chain conveyor 10 is an existing mesh chain conveyor, and the conveying part is a mesh structure. In this utility model, the water in the slag can drip from the mesh of the mesh structure into the slag pool 1.

[0020] This invention relates to the separation of slag and water in blast furnace slag. In use, the slag is introduced into a slag pool 1 for cracking and water quenching, forming slag particles of varying sizes. The slag continuously sinks to the bottom of the slag pool 1. A bottom mesh conveyor 4 is then activated. After the slag settles, the slag particles are transported by the bottom mesh conveyor 4 to the slag discharge trough 6. Water passes sequentially through the bottom mesh conveyor 4 and the filter screen 3 before entering the water storage chamber 5. An auger 7 is then activated to transport the slag and water in the slag discharge trough 6. The slag and water are then fed into a spiral conveyor via a slag discharge pipe. The slag is lifted upward by the screw conveyor 8. When the slag particles are higher than the water surface of the slag pool 1, the slag is separated from the water and then falls onto the top mesh chain conveyor 10 through the slag discharge pipe 9. The slag is spread on the top mesh chain conveyor 10 under the action of gravity. Driven by the top mesh chain conveyor 10, the slag is filtered to remove water again. The water drips back into the slag pool 1, and the slag after being filtered again is transported outside the slag pool 1 by the top mesh chain conveyor 10, thus completing the slag-water separation of the blast furnace slag.

[0021] In this invention, the conveying and filtration of water slag are both automated processes. Compared to the traditional manual operation of the overhead crane grab bucket, this invention eliminates the need for manual slag handling, achieving a high degree of automation. The entire slag-water separation process is automatic and continuous, resulting in high work efficiency. Secondly, during slag-water separation, the bottom mesh conveyor 4 filters the water slag, while simultaneously using a filter screen 3. After two filtrations, the water enters the storage chamber 5, is discharged after water quenching, and the water slag is sequentially fed into the slag discharge trough 6 and the screw conveyor 8. When the water slag height is higher than the liquid level... The water in the slag is drained, completing one stage of slag-water separation. The slag is then sent to the top mesh chain conveyor 10. During transportation, the water in the slag is separated again and returned to the slag pool 1. This process not only drains the slag but also reduces water waste. Meanwhile, after the slag water quenching is completed, the water level in the slag pool 1 continuously decreases, and the floating slag also sinks and is carried away by the bottom mesh chain conveyor 4, achieving slag removal and providing a good slag-water separation effect. Finally, the structure and operation of this utility model are relatively simple, and the infrastructure investment and production maintenance costs are low, making it economically affordable for most blast furnace manufacturers.

[0022] To facilitate the discharge of slag, the slag discharge end of the slag discharge pipe 9 is set at an angle downwards.

[0023] A water slag conveyor 11 is installed below the discharge end of the top mesh chain conveyor 10. The water slag conveyor 11 is an existing conveying equipment, and a belt conveyor or other structure can be selected to facilitate the transport of water slag to the required position. The installation of the water slag conveyor 11 improves the automation level of the entire device.

[0024] Several horizontal plates 12 are spaced along the length of the bottom mesh conveyor 4. The ends of the horizontal plates 12 are in close contact with the upper surface of the filter screen 3. The horizontal plates 12 have two functions: when the horizontal plates 12 are located at the upper part of the bottom mesh conveyor 4, they can push the water slag towards the slag discharge trough 6 to prevent water slag from accumulating; when the horizontal plates 12 are located at the lower part of the bottom mesh conveyor 4, they move in the opposite direction to the slag discharge trough 6, and at the same time, their ends are in close contact with the upper surface of the filter screen 3 to scrape off the water slag particles adhering to the surface of the filter screen 3, preventing water slag from clogging the filter screen 3 and ensuring the filtration effect of the filter screen 3.

[0025] A vibrating plate 13 is inclinedly installed on the water slag pool 1 below the slag discharge end of the slag discharge pipe 9. When the water slag is discharged from the slag discharge pipe 9, it will first fall onto the vibrating plate 13. The vibrating plate 13 is existing technology and will generate vibration. The water slag falls on it and is further dispersed under the action of vibration, so that it is spread flat on the top mesh chain conveyor 10 below, which is conducive to draining the water and improving the slag-water separation effect.

[0026] A drain pipe 14 is installed at the bottom of the water storage chamber 5. A filter sedimentation tank 15 and a water storage tank 16 are sequentially installed on the drain pipe 14. The water storage tank 16 is connected to the sludge tank 1 through a pipeline. In operation, the water in the sludge tank 1 enters the water storage chamber 5 after passing through the bottom mesh conveyor 4 and the filter screen 3. However, the water often still contains some fine water sludge particles that cannot be separated. To further purify the water, water treatment equipment such as the filter sedimentation tank 15 can be used for treatment. The treated water is then stored in the water storage tank 16 to prevent blockage of subsequent pipes and equipment, and to facilitate use. The water is then returned to the sludge tank 1 for repeated recycling.

[0027] Both sides of the top mesh chain conveyor 10 are provided with skirt-type guards 17. The skirt-type guards 17 are existing technology and are installed on both sides of the top mesh chain conveyor 10 to prevent water slag from falling from both sides of the top mesh chain conveyor 10.

[0028] The mesh diameter of the bottom mesh conveyor 4 is larger than that of the filter screen 3. Water from the slag pool 1 enters the storage chamber 5 by passing through the bottom mesh conveyor 4 and the filter screen 3 sequentially. The bottom mesh conveyor 4 performs the first filtration, and the filter screen 3 performs the second filtration, resulting in a better filtration effect. In actual production, it was found that some small particles of slag adhere to the conveyor mesh of the bottom mesh conveyor 4 and fall onto the filter screen 3 during the return journey, reducing the filtration effect. To avoid this problem, a scraper can be installed on the filter screen 3 below the discharge end of the bottom mesh conveyor 4. This scraper removes the slag adhering to the conveyor mesh, ensuring a better filtration effect.

Claims

1. A slag-water separation device for blast furnace slag, characterized in that: The system includes a slag pool (1) and a partition net (2) set on one side of the bottom of the slag pool (1). A filter net (3) is set in the lower part of the slag pool (1). The end of the filter net (3) is connected to the upper end of the partition net (2). A bottom mesh chain conveyor (4) is set above the filter net (3). A relatively closed water storage cavity (5) is formed between the filter net (3), the partition net (2) and the side wall of the slag pool (1). The internal space of the slag pool (1) on the other side of the partition net (2) forms a slag discharge trough (6). The bottom of the slag discharge trough (6) is arc-shaped. An auger (7) is set in the slag discharge trough (6). A slag discharge pipe is provided on one side of the slag discharge trough (6), and the end of the screw conveyor (7) extends into the slag discharge pipe. A screw elevator (8) is provided on the outside of the water slag pool (1). The end of the slag discharge pipe is connected to the feed inlet at the bottom of the screw elevator (8). A slag discharge pipe (9) is provided on the upper part of the screw elevator (8). The slag discharge end of the slag discharge pipe (9) extends into the upper part of the water slag pool (1). A top mesh chain conveyor (10) is provided in the water slag pool (1) below the slag discharge end of the slag discharge pipe (9). The discharge end of the top mesh chain conveyor (10) extends to the outside of the water slag pool (1).

2. The slag-water separation device for blast furnace slag according to claim 1, characterized in that: The slag discharge end of the slag discharge pipe (9) is inclined downward.

3. The slag-water separation device for blast furnace slag according to claim 1, characterized in that: A water slag conveyor (11) is installed below the discharge end of the top mesh chain conveyor (10).

4. The slag-water separation device for blast furnace slag according to claim 1, characterized in that: The bottom mesh chain conveyor (4) has several horizontal plates (12) spaced apart along its length, with the ends of the horizontal plates (12) closely attached to the upper surface of the filter screen (3).

5. The slag-water separation device for blast furnace slag according to claim 1, characterized in that: A vibrating plate (13) is inclinedly installed on the slag pool (1) below the slag discharge end of the slag discharge pipe (9).

6. The slag-water separation device for blast furnace slag according to claim 1, characterized in that: The bottom of the water storage chamber (5) is provided with a drain pipe (14), and a filter sedimentation tank (15) and a water storage tank (16) are arranged on the drain pipe (14) in sequence. The water storage tank (16) is connected to the slag tank (1) through a pipeline.

7. The slag-water separation device for blast furnace slag according to claim 1, characterized in that: Both sides of the top mesh conveyor (10) are provided with skirt-type sidewalls (17).

8. A blast furnace slag water separation device according to claim 1, characterized in that: The mesh diameter of the bottom mesh conveyor (4) is larger than that of the filter screen (3).

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