Converter steelmaking dust removal waste recycling system

Abstract

The utility model discloses a converter steelmaking dedusting waste recycling system which comprises a recycling box, a feeding port and a water supplementing port, the feeding port and the water supplementing port are formed in the top of the recycling box, the interior of the recycling box is sequentially divided into a grinding chamber and a mixing chamber from top to bottom through a first filter screen, and a vertical shaft is concentrically arranged in the grinding chamber; a hemispherical upper mill is arranged at the lower end of the vertical shaft, a lower mill is arranged in the recycling box below the upper mill, the inner surface of the lower mill is a spherical surface matched with the lower surface of the upper mill, a discharging hole is machined in the bottom of the lower mill, the first filter screen is obliquely arranged, and a discharging pipe is arranged on the side wall of the recycling box above the lower end of the first filter screen. A dryer and a dry magnetic separator are sequentially arranged on the discharge pipe, a tailing outlet of the dry magnetic separator is communicated with a mixing chamber through a pipeline, a stirrer is arranged in the mixing chamber, a liquid discharge pipe is arranged at the bottom of the mixing chamber, and a wet magnetic separator is arranged on the liquid discharge pipe. In conclusion, the device has the advantages of less resource waste, high working efficiency and good recovery effect.

Description

Technical Field

[0001] This utility model relates to the field of waste recycling technology, specifically to a waste recycling system for converter steelmaking dust removal. Background Technology

[0002] Converter steelmaking is one of the steelmaking methods used by steel companies. When using converter steelmaking, a large amount of smoke and dust is generated. If this smoke and dust is directly emitted into the air, it will cause serious environmental pollution and affect human health and plant growth. Therefore, from an environmental protection perspective, it needs to be treated. The treatment method is mostly to use dust removal equipment in the later stages of steelmaking. After treatment, a large amount of sludge and other wastes will be collected from the smoke and dust. The sludge and dust contain a certain amount of iron powder, which can be returned to the steel plant to be made into pellets and used as raw materials for steelmaking.

[0003] Currently, the recycling system for converter steelmaking dust removal waste still faces the following problems: First, the recycling effect is poor, as not all iron powder can be recovered, and some iron powder remains in the sludge, resulting in resource waste; second, the process is complex, involves numerous pieces of equipment, occupies a large area, and has relatively low recycling efficiency, failing to adequately meet the needs of waste recycling. Therefore, it is objectively necessary to develop a converter steelmaking dust removal waste recycling system that minimizes resource waste, has high efficiency, and provides good recycling results. Utility Model Content

[0004] The purpose of this utility model is to provide a converter steelmaking dust removal waste recycling system that has low resource waste, high work efficiency, and good recycling effect.

[0005] The purpose of this utility model is achieved as follows: it includes a recycling box and a feed inlet and a water inlet located on the top of the recycling box. The interior of the recycling box is divided into a grinding chamber and a mixing chamber from top to bottom by a first filter screen. A vertical shaft is concentrically arranged in the grinding chamber. The upper end of the vertical shaft extends out of the top of the recycling box and is connected to a motor. A hemispherical upper mill is arranged at the lower end of the vertical shaft. A lower mill is arranged in the recycling box below the upper mill. The inner surface of the lower mill is a spherical surface that matches the lower surface of the upper mill. A discharge hole is machined at the bottom of the lower mill. The first filter screen is inclined. A discharge pipe is arranged on the side wall of the recycling box above the lower end of the first filter screen. A dryer and a dry magnetic separator are arranged sequentially on the discharge pipe. The tail material outlet of the dry magnetic separator is connected to the mixing chamber through a pipe. A stirrer is arranged in the mixing chamber. A drain pipe is arranged at the bottom of the mixing chamber. A wet magnetic separator is arranged on the drain pipe.

[0006] Furthermore, the height of the ball's center in the upper grinding process is lower than that in the lower grinding process.

[0007] Furthermore, the recycling bin includes a top plate, a cylinder, and a bottom plate, with the top plate and cylinder connected by flanges and bolts.

[0008] Furthermore, the tail material outlet of the wet magnetic separator is connected to a filter via a pipeline, and the drain outlet of the filter is connected to the water inlet via a pipeline.

[0009] Furthermore, a baffle is installed in the grinding chamber above the upper mill, and a flow channel is left between the baffle and the vertical shaft. A stirring blade is installed on the vertical shaft above the baffle.

[0010] Furthermore, the upper surface of the upper mill is machined with a groove, a second filter screen is provided at the upper end of the groove, and a through hole communicating with the groove is machined at the bottom of the upper mill.

[0011] In operation, the waste from converter steelmaking dust removal and water are simultaneously added to the grinding chamber of the recovery box. The motor is started, driving the vertical shaft and upper mill to rotate. The sludge and other waste, along with water, enter the gap between the upper and lower mills, promoting mixing and forming a uniform slurry. The particles in the slurry are continuously subjected to compression, friction, and pulling. The layer of calcium oxide, iron oxide, and other impurities covering the surface of the pig iron particles are ground off, forming fine powder that detaches from the pig iron particles and completely separates from them, entering the slurry. Subsequently, it is discharged from the discharge hole at the bottom of the lower mold and falls onto the first filter screen. The particle size... Larger coarse particles are separated and discharged from the discharge pipe, then sequentially enter the dryer and dry magnetic separator. The dried particles undergo magnetic separation in the dry magnetic separator to obtain pig iron powder with a total iron content greater than 92%. The smaller fine particles pass through the filter holes of the first filter screen and fall into the mixing chamber along with the slurry. At the same time, the tailings from the dry magnetic separator are also discharged into the mixing chamber, stirred by the agitator, and then discharged through the drain pipe to enter the wet magnetic separator. The wet magnetic separator is used to magnetically separate the remaining pig iron powder in the slurry, removing smaller pig iron particles and those missed by the dry magnetic separator. In this invention, waste materials such as sludge are first mixed with water to form a slurry. Simultaneously, upper and lower mills are used to grind the particles in the slurry, removing the calcium oxide and iron oxide coatings on the particle surfaces. After screening, pig iron powder is recovered using both dry and wet magnetic separators. The recovery effect of pig iron powder is good, and it can be recovered relatively thoroughly, reducing resource waste. Secondly, the recovery box integrates mixing, grinding, screening, and stirring functions, reducing the process and equipment required for sludge treatment. It allows for continuous sludge treatment, reduces the equipment footprint, and improves the recovery efficiency of waste from converter steelmaking dust removal, meeting the needs of waste recycling in converter steelmaking. In summary, this invention has the advantages of low resource waste, high work efficiency, and good recovery effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] In the diagram: 1-Recovery box, 2-Inlet, 3-Water inlet, 4-First filter screen, 5-Grinding chamber, 6-Mixing chamber, 7-Vertical shaft, 8-Motor, 9-Upper mill, 10-Lower mill, 11-Discharge hole, 12-Dryer, 13-Dry magnetic separator, 14-Agitator, 15-Wet magnetic separator, 16-Top plate, 17-Flange, 18-Filter, 19-Baffle, 20-Flow channel, 21-Agitator blade, 22-Groove, 23-Second filter screen, 24-Through hole. Detailed Implementation

[0014] 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.

[0015] like Figure 1 As shown, this utility model includes a recycling bin 1 and a feed inlet 2 and a water inlet 3 located on the top of the recycling bin 1. The interior of the recycling bin 1 is divided into a grinding chamber 5 and a mixing chamber 6 from top to bottom by a first filter screen 4. A vertical shaft 7 is concentrically arranged in the grinding chamber 5. The upper end of the vertical shaft 7 extends out of the top of the recycling bin 1 and is connected to a motor 8. The motor 8 is an existing device, and its power, speed and other parameters can be selected and installed in the market according to actual needs. A hemispherical upper mill 9 is provided at the lower end of the vertical shaft 7. A lower mill 10 is provided in the recycling bin 1 below the upper mill 9. The inner surface of the lower mill 10 is a spherical surface that matches the lower surface of the upper mill 9. There is a certain gap between the upper mill 9 and the inner surface of the lower mill 9. After the slurry enters, the upper mill 9 rotates, causing the particles in the slurry to collide, squeeze, rub, and pull continuously, gradually removing calcium oxide and other substances from the surface of the pig iron powder. The bottom of the lower mill 10 is machined with a discharge hole 11. The first filter screen 4 is set at an angle. A discharge pipe is set on the side wall of the recovery box 1 above the lower end of the first filter screen 4. A dryer 12 and a dry magnetic separator 13 are sequentially set on the discharge pipe. The tail material outlet of the dry magnetic separator 13 is connected to the mixing chamber 6 through a pipe. An agitator 14 is set in the mixing chamber 6. A drain pipe is set at the bottom of the mixing chamber 6. A wet magnetic separator 15 is set on the drain pipe. The dryer 12, dry magnetic separator 13, agitator 14, and wet magnetic separator 15 are all existing equipment and can be purchased and installed on the market according to the usage requirements.

[0016] In operation, the waste from converter steelmaking dust removal and water are simultaneously added to the grinding chamber 5 of the recovery box 1. The motor 8 is started, driving the vertical shaft 7 and the upper mill 9 to rotate. The waste such as ash and water enter the gap between the upper mill 9 and the lower mill 10, promoting the mixing of ash and water to form a uniform slurry. The particles in the slurry are continuously subjected to compression, friction, and pulling. The layer of calcium oxide, iron oxide, and other impurities covering the surface of the pig iron particles are ground off, forming fine powder that falls off the surface of the pig iron particles and completely separates from them, entering the slurry. Subsequently, it is discharged from the discharge hole 11 at the bottom of the lower mold 10 and falls onto the first filter screen 4. The particle size is relatively large. The coarse particles are separated and discharged from the discharge pipe, and then enter the dryer 12 and the dry magnetic separator 13 in sequence. The dried particles are magnetically separated in the dry magnetic separator 13 to obtain pig iron powder with a total iron content of more than 92%. The smaller fine particles pass through the filter holes of the first filter screen 4 and fall into the mixing chamber 6 along with the slurry. At the same time, the tail material after magnetic separation by the dry magnetic separator 13 is also discharged into the mixing chamber 6. After being stirred by the agitator 14, it is discharged through the drain pipe and enters the wet magnetic separator 15. The wet magnetic separator 15 is used to magnetically separate the remaining pig iron powder in the slurry, and magnetically separates the smaller pig iron particles and the pig iron particles missed by the dry magnetic separator 13. In this invention, waste materials such as sludge are first mixed with water to form a slurry. Simultaneously, the particles in the slurry are ground using an upper mill 9 and a lower mill 10 to remove the coating layers of calcium oxide and iron oxide on the particle surfaces. After screening, pig iron powder is recovered using a dry magnetic separator 13 and a wet magnetic separator 15, respectively. The recovery effect of pig iron powder is good, and it can be recovered relatively thoroughly, reducing resource waste. Secondly, the recovery box 1 integrates the functions of mixing, grinding, screening, and stirring, reducing the process and equipment required for sludge treatment. It allows for continuous sludge treatment, reduces the equipment footprint, and improves the recovery efficiency of waste materials from converter steelmaking dust removal, meeting the needs of waste material recycling in converter steelmaking.

[0017] The height of the center of the upper mill 9 is lower than that of the lower mill 10. The upper mill 9 is hemispherical, and the inner surface of the lower mill 10 is also spherical. If the height of the center of the two mills is the same, that is, the center of the two mills coincides, then the gap between the upper mill 9 and the lower mill 10 is the same. Although the grinding of mortar particles can be achieved, the grinding effect needs to be improved. After the height of the center of the upper mill 9 is lower than that of the center of the lower mill 10, the distance between the two gradually narrows from top to bottom, thereby continuously improving the grinding effect of mortar particles and obtaining pig iron powder with a high total iron content.

[0018] The recycling bin 1 includes a top plate 16, a cylinder and a bottom plate. The top plate 16 and the cylinder are connected by a flange 17 and bolts. In this utility model, the upper mill 9 is installed together with the top plate 16. In order to facilitate the disassembly, assembly and maintenance of the upper mill 9, the top plate 16 and the cylinder are connected by a flange.

[0019] The tail material outlet of the wet magnetic separator 15 is connected to a filter 18 via a pipeline, and the drain outlet of the filter 18 is connected to the water inlet 3 via a pipeline. The wet magnetic separator 15 performs wet magnetic separation on the slurry, removing iron powder and other solid impurities. The filter 18 is a conventional filtration device used in this invention for solid-liquid separation, separating the remaining solid impurities from the slurry for unified processing. The remaining liquid can be returned to the water inlet 3 and added back to the recycling tank 1 for reuse, improving water resource utilization and reducing water resource usage costs.

[0020] A partition 19 is installed in the grinding chamber 5 above the upper mill 9. A flow channel 20 is left between the partition 19 and the vertical shaft 7. A stirring blade 21 is installed on the vertical shaft 7 above the partition 19. The grinding of sludge in this system is wet grinding. Water is mixed with sludge to cool, dilute and lubricate the sludge, reducing energy consumption, improving grinding efficiency, and reducing dust generation and environmental pollution. In actual process, it was found that directly feeding water and sludge into the grinding chamber 5 resulted in poor mixing and could not effectively lubricate the particles in the sludge, affecting the wet grinding effect of the sludge. To solve this problem, the partition 19 is set up to create a relatively closed space. The stirring blade 21 is then used to stir the sludge and water, so that the sludge and water are fully mixed in advance, improving the subsequent grinding effect.

[0021] The upper surface of the upper mill 9 is machined with a groove 22, and a second filter screen 23 is installed at the upper end of the groove 22. The bottom of the upper mill 9 is machined with a through hole 24 communicating with the groove 22. Waste materials such as slurry are mixed with water in the recycling box 1 above the partition 19 to form a uniformly mixed slurry, which then falls from the flow channel 20. In actual operation, it was found that due to the high water content in the slurry, water would accumulate, which might affect the normal grinding of the slurry. To solve this problem, a second filter screen 23 was installed. When the slurry falls onto the second filter screen 23, the particulate components and a small amount of slurry enter between the upper mill 9 and the lower mill 10 for grinding, while most of the fine ash and slurry pass through the filter holes of the first filter screen 4, enter the groove 22, and are discharged through the through hole 24, avoiding the problem of large water accumulation.

[0022] In this invention, the pig iron powder obtained by the dry magnetic separator 13 has a total iron content greater than 92% and an elemental iron content greater than 85%. This pig iron powder can be provided to chemical enterprises as a reducing agent or for other applications. The pig iron powder obtained by the wet magnetic separator 15 has a total iron content greater than 50% and can be returned to the steelmaking workshop as a raw material for steelmaking. The impurities separated by the filter 18 contain very little iron but have a high calcium oxide content and fine particle size, and can be used as iron-containing raw materials for cement production. The remaining wastewater is returned to the system for continued recycling. The above methods achieve resource recovery and utilization of waste from converter steelmaking dust removal.

Claims

1. A system for recycling waste from dust removal in converter steelmaking, comprising a recycling bin (1) and a feed inlet (2) and a water inlet (3) located on the top of the recycling bin (1), characterized in that... The interior of the recycling bin (1) is divided into a grinding chamber (5) and a mixing chamber (6) from top to bottom by a first filter screen (4). A vertical shaft (7) is concentrically arranged in the grinding chamber (5). The upper end of the vertical shaft (7) extends out of the top of the recycling bin (1) and is connected to a motor (8). A hemispherical upper mill (9) is arranged at the lower end of the vertical shaft (7). A lower mill (10) is arranged in the recycling bin (1) below the upper mill (9). The inner surface of the lower mill (10) is a spherical surface that matches the lower surface of the upper mill (9). (10) has a discharge hole (11) at the bottom. The first filter screen (4) is set at an angle. A discharge pipe is set on the side wall of the recycling box (1) above the lower end of the first filter screen (4). A dryer (12) and a dry magnetic separator (13) are set on the discharge pipe in sequence. The tail material outlet of the dry magnetic separator (13) is connected to the mixing chamber (6) through a pipe. A stirrer (14) is set in the mixing chamber (6). A drain pipe is set at the bottom of the mixing chamber (6). A wet magnetic separator (15) is set on the drain pipe.

2. The converter steelmaking dust removal waste recycling system according to claim 1, characterized in that... The height of the ball center in the upper mill (9) is lower than the height of the ball center in the lower mill (10).

3. The converter steelmaking dust removal waste recycling system according to claim 1, characterized in that... The recycling bin (1) includes a top plate (16), a cylinder and a bottom plate. The top plate (16) and the cylinder are connected by a flange (17) and bolts.

4. A converter steelmaking dust removal waste recycling system according to claim 1, characterized in that... The tail material outlet of the wet magnetic separator (15) is connected to a filter (18) via a pipeline, and the drain outlet of the filter (18) is connected to the water inlet (3) via a pipeline.

5. A converter steelmaking dust removal waste recycling system according to claim 1, characterized in that... The grinding chamber (5) above the upper mill (9) is provided with a partition (19), and a flow channel (20) is left between the partition (19) and the vertical shaft (7). A stirring blade (21) is provided on the vertical shaft (7) above the partition (19).

6. A converter steelmaking dust removal waste recycling system according to claim 5, characterized in that... The upper surface of the upper mill (9) is machined with a groove (22), and a second filter screen (23) is provided at the upper end of the groove (22). The bottom of the upper mill (9) is machined with a through hole (24) communicating with the groove (22).

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