A comprehensive utilization system for recycling steel smelting waste materials

Abstract

The utility model belongs to solid waste utilization equipment technical field provides a kind of steel smelting waste material recycling comprehensive utilization system, and this system includes waste material bin, iron removal device, grading device, drying device, small particle size material bin. After waste material is removed ferromagnetic material by conveying belt and enters iron removal device, it is separated by grading device according to particle size;Ferromagnetic material is transported to steelmaking process, small particle size material is sent into small particle size material bin and temporarily stored, and large particle size material is transported to ironmaking process after dehydration treatment in drying device, realize material efficient classification and resource utilization, improve steel smelting waste material recycling utilization rate.

Description

Technical Field

[0001] This utility model relates to a solid waste utilization system, specifically a waste material utilization system for the iron and steel smelting industry, and belongs to the technical field of solid waste utilization equipment. Background Technology

[0002] With increasing domestic and international demands for environmental protection and sustainable development, the recycling of solid waste resources from the steel smelting industry, a heavily polluting sector, has gradually attracted widespread attention from the government and the public. If various waste materials generated during steel production are not effectively treated, they will not only cause serious environmental pollution but also lead to a significant waste of valuable resources. Currently, steel enterprises generally suffer from chaotic waste material storage and unclear classification, with different types of solid waste such as dust collector ash and iron oxide scale being stored together. This increases the difficulty of subsequent treatment and reduces the value of resource recovery.

[0003] Existing solid waste treatment systems suffer from the following technical deficiencies: First, they lack a systematic material pretreatment process, failing to effectively separate and recover iron components; second, the material grading accuracy is insufficient, making it impossible to differentiate utilization based on the characteristics of materials with different particle sizes; third, the system integration is low, with a lack of coordination between processing units, making it difficult to achieve fully automated control of the entire process. For example, traditional treatment methods often treat waste materials of different particle sizes uniformly, leading to dust pollution from fine particles during subsequent smelting, while coarse particles, due to insufficient drying, affect smelting efficiency.

[0004] A more prominent problem is that the existing system has failed to establish a complete resource recycling chain. Small-particle materials such as dust collector coke powder are often simply landfilled or sold at low prices, which not only fails to meet environmental protection requirements but also wastes resources. At the same time, the system lacks precise batching control methods, making it difficult to ensure the stability of material ratios in deep processing stages such as pelletizing, directly affecting the quality of the final product. These technical bottlenecks severely restrict steel companies from achieving their goals of "zero emissions" of solid waste and efficient resource utilization. Utility Model Content

[0005] To address the aforementioned problems in existing technologies, the purpose of this application is to provide a comprehensive recycling system and method for waste materials from iron and steel smelting, which has the advantages of systematic pretreatment of waste materials, effective separation of ferromagnetic substances, precise grading of materials of different particle sizes, improved resource utilization, and reduced environmental pollution. This utility model provides a comprehensive recycling system for waste materials from iron and steel smelting, capable of achieving efficient classification, precise sorting, and resource utilization of waste materials of all particle sizes. The system includes a waste material silo, an iron removal device, a grading device, a drying device, and a small-particle-size material silo. The iron removal device effectively removes ferromagnetic substances, and the obtained iron-containing components are directly used in the steelmaking process. The grading device separates materials according to particle size; large-particle-size materials are dried and returned to the iron smelting process; small-particle-size materials enter the subsequent forming process, where they are evenly conveyed to the forming equipment by a disc feeder and processed into metallurgical furnace charge, achieving efficient resource reuse.

[0006] According to the technical solution provided by this utility model, a comprehensive recycling system for waste materials from iron and steel smelting is provided.

[0007] A comprehensive recycling system for waste materials from iron and steel smelting is disclosed. The system includes a waste material silo, an iron removal device, a grading device, a drying device, a small-particle-size material silo, a first conveying device, a second conveying device, and a third conveying device. The first conveying device connects the outlet of the waste material silo to the inlet of the grading device. The iron removal device is positioned above the first conveying device. The grading device includes a coarse-particle outlet and a fine-particle outlet. The second conveying device connects the coarse-particle outlet of the grading device to the drying device. The third conveying device connects the fine-particle outlet of the grading device to the small-particle-size material silo.

[0008] Preferably, the system also includes steelmaking equipment and a fourth conveying device. The fourth conveying device connects the discharge port of the iron removal device and the inlet of the steelmaking equipment.

[0009] Preferably, the system also includes ironmaking equipment and a fifth conveying device. The fifth conveying device connects the discharge port of the drying unit and the feed port of the ironmaking equipment.

[0010] Preferably, the system also includes a pelletizing device and a sixth conveying device. The sixth conveying device connects the outlet of the small-diameter material bin to the inlet of the pelletizing device.

[0011] Preferably, the system also includes a dust hopper. The outlet of the dust hopper is located above the sixth conveying device.

[0012] Preferably, a feeder and a first weighing device are provided between the discharge port of the small particle size silo and the sixth conveying device. An ash discharge valve, a second weighing device, and a humidifying device are provided between the discharge port of the dust silo and the sixth conveying device.

[0013] Preferably, a vibrator is installed on the side wall of the small particle size material silo. A vibrator is installed on the side wall of the dust silo.

[0014] Preferably, the iron removal device is a multi-pole iron remover.

[0015] Preferably, the grading device is a screening device with a screen aperture of 6-15mm.

[0016] Preferably, the first weighing device is a belt scale. The second weighing device is a screw scale. The feeder is a disc feeder. The ash discharge valve is a rotary valve. The humidification device is a water spray device.

[0017] In existing technologies, solid waste generated by the steel smelting industry has long been characterized by disorderly stockpiling, leading to both environmental pollution and resource waste. Traditional treatment methods typically mix waste materials of different particle sizes and properties, failing to achieve refined classification and utilization. For example, materials such as dust collector coke powder are difficult to process in subsequent stages due to a lack of effective sorting methods, resulting in the loss of recyclable resources. Existing systems generally suffer from insufficient sorting accuracy and low automation, failing to meet the requirements for graded treatment of materials of all particle sizes, thus increasing the risk of secondary pollution.

[0018] To address the aforementioned problems, the inventors discovered that material mixing is a core factor leading to low resource utilization. By analyzing the differences in material physical properties, they recognized that the sorting process must prioritize the removal of ferromagnetic substances and achieve particle size classification. Based on this, they proposed moving the iron removal and classification processes upstream, constructing a modular processing flow. Independent conveying paths were designed for materials of different particle sizes to avoid cross-contamination. Continuous operation was achieved through a series-connected equipment layout, reducing manual intervention.

[0019] The steel smelting waste recycling system provided by this invention can finely process all-particle-size input waste materials, classifying and utilizing them according to particle size before processing them in different systems, thus achieving resource recovery and utilization without significantly impacting subsequent processes. The establishment of this system helps reduce the demand for raw materials, contributes to reducing waste emissions, and achieves resource recycling. Figure 1 and Figure 2As shown, the system includes: (1) Raw material input system: waste storage silo, input belt conveyor; (2) Processing system 1: iron remover, conveying device (to steelmaking system); (3) Processing system 2: waste dust silo, graded storage silo, rotary valve, screw scale, screw humidifier, graded storage silo, silo wall vibrator, disc feeder, batching belt scale, metering scale 1, output belt conveyor 1, output belt conveyor 2 (to primary material yard and iron raw material batching); (4) Processing system 3: screening equipment, dryer, output belt conveyor 3 (to ironmaking system), metering scale 2;

[0020] The locations and connections between the devices in the various subsystems within this large system are as follows:

[0021] (1) Raw material conveying system: An input belt conveyor is installed under the waste storage silo.

[0022] (2) Processing system: An iron separator is installed above the input belt conveyor 1, and the iron discharge outlet of the iron separator is connected to the inlet of the steelmaking system. A screening device is installed below the input belt conveyor 1.

[0023] (3) Processing System: The outlet of the screening equipment undersize chute is connected to the inlet of the grading storage silo. The grading storage silo is equipped with a silo wall vibrator. A disc feeder is installed below the waste silo. The outlet of the disc feeder is connected to the inlet of the batching belt scale. The system also includes a waste dust silo for storing 0-3mm powdery materials conveyed by pneumatic conveying. The waste dust silo is equipped with a silo wall vibrator. The bottom of the silo is connected to the inlet of the star-shaped ash discharge valve. The outlet of the star-shaped ash discharge valve is connected to the inlet of the screw scale. The outlet of the screw scale is connected to the inlet of the screw humidifier located below. The batching belt scale and the screw humidifier are arranged in parallel. An output belt conveyor is installed downstream of them. Behind the discharge point of the batching belt scale and the screw humidifier, along the running direction of the output belt conveyor, a metering scale 1 is installed on the output belt conveyor. The discharge outlet of the belt conveyor is connected to the receiving inlet of the output belt conveyor (to the primary material yard and iron raw material batching).

[0024] (4) Processing system: The chute outlet of the screening equipment is located above the output belt conveyor. The discharge port of the output belt conveyor is connected to the inlet of the dryer. The output belt conveyor (to the ironmaking system) is located below the outlet of the dryer. A weighing scale is installed on the output belt conveyor (to the ironmaking system).

[0025] The comprehensive utilization system provided by this utility model can classify ferromagnetic materials and non-ferromagnetic iron-containing large-particle waste materials and non-ferromagnetic iron-containing small-particle waste materials in the same system and send them to the corresponding smelting system for processing.

[0026] In this invention, the iron removal device refers to equipment used to remove ferromagnetic impurities from materials, specifically a permanent magnet drum or electromagnetic iron separator, which separates metallic substances through the action of a magnetic field. The grading device refers to equipment that separates materials according to particle size, specifically a vibrating screen or air classifier, which distinguishes materials of different particle sizes through mechanical sieving or aerodynamic principles. The first conveying device refers to material transfer equipment, specifically a belt conveyor or screw conveyor, which carries materials from the waste material silo to the grading device. The drying device refers to equipment that removes moisture from the materials, specifically a rotary dryer or fluidized bed dryer, which reduces the humidity of the materials through hot air contact. During the material transport from the waste material silo via the first conveying device, the iron removal device above continuously adsorbs ferromagnetic impurities. After iron removal, the material enters the grading device and is divided into coarse and fine particles according to a preset particle size standard. The coarse particles are conveyed via the second conveying device to the drying device for dehydration, while the fine particles are directly stored in the small particle size silo via the third conveying device. This process achieves material classification through physical sorting, and the equipment in each process is connected by a directional conveying device to form a continuous processing line. This solution utilizes a series-connected iron removal and grading device to simultaneously remove ferromagnetic substances and classify particles during material transport. Compared to traditional mixing processes, the sorting accuracy is significantly improved, avoiding interference between materials of different particle sizes. Ferromagnetic substances are removed promptly during transport, preventing them from affecting equipment operation in subsequent processes. After classification, materials of different particle sizes enter the matching processing stage, providing raw materials that meet particle size requirements for subsequent processing. The overall system operation continuity is enhanced, the need for manual intervention is reduced, and processing efficiency is improved.

[0027] In this invention, the steelmaking equipment refers to an industrial device used to remelt recycled metal materials, specifically an electric arc furnace or converter. Its function is to directly feed the metal materials separated by the iron removal device into the smelting process. The fourth conveying device refers to a material transfer device connecting the iron removal device and the steelmaking equipment, specifically a belt conveyor or screw conveyor. Its function is to achieve continuous conveying of metal materials from the iron removal device to the steelmaking equipment. The metal materials separated by the iron removal device are directly conveyed to the feed inlet of the steelmaking equipment via the fourth conveying device. In this process, the metal materials do not need to undergo intermediate storage or secondary transfer and directly enter the smelting process of the steelmaking equipment.

[0028] In this invention, the ironmaking equipment refers to equipment used to smelt iron-containing raw materials into molten iron, specifically a blast furnace or a smelting reduction furnace, used to receive dried coarse-grained materials as raw materials. The fifth conveying device refers to material transfer equipment, specifically a belt conveyor or a screw conveyor, used to directionally transport the dried coarse-grained materials to the ironmaking equipment. The coarse-grained materials separated by the grading device enter the drying device through the second conveying device to complete dehydration treatment, and then the fifth conveying device directly transports the dried material to the feed inlet of the ironmaking equipment. This application solves the technical problem that coarse-grained materials cannot be directly used in ironmaking production, realizes the directional utilization of dried materials, reduces energy consumption and environmental pollution in intermediate transfer links, and ensures a stable supply of ironmaking raw materials.

[0029] In this invention, the pelletizing device refers to equipment that processes fine-grained materials into pellets. Specifically, it can be implemented using a disc pelletizer or a roller pelletizer, which applies mechanical force and adds a binder to form regular spheres. This device is used to convert sorted fine-grained materials into molding raw materials suitable for metallurgical processes, solving the problem that fine-grained materials are difficult to utilize directly due to their small particle size. The sixth conveying device is a material transfer device connecting the small-diameter material bin and the pelletizing device. Specifically, it can be implemented using a belt conveyor or a screw conveyor. Continuous conveying ensures that the material enters the pelletizing device uniformly, avoiding instability in the pelletizing process due to material accumulation or interruption. The fine-grained material separated by the grading device is temporarily stored in the small-diameter material bin via the third conveying device. The sixth conveying device continuously conveys the material from the bottom outlet of the bin to the inlet of the pelletizing device. The pelletizing device presses and shapes the fine-grained material into pellets with a certain strength. This process realizes the resource utilization of fine-grained materials, preventing them from scattering or accumulating in subsequent processes due to their small particle size.

[0030] In this invention, the dust silo refers to a container used for storing and conveying dusty materials. Specifically, it can be a steel silo structure with a sealed cover. A conical discharge port can be configured at the bottom of the silo to collect fine particulate matter generated before pelletizing, preventing dust from escaping and polluting the environment. The sixth conveying device is a material transfer device connecting the small-diameter material silo and the pelletizing device. Specifically, it can be a belt conveyor or a screw conveyor. Its function is to transport materials of different particle sizes to the pelletizing device for mixing and processing in a proportional manner. The discharge port being located above the conveying device means that the discharge position of the dust silo is arranged above the conveying path of the sixth conveying device. Specifically, it can be fixed by a suspended bracket. Its function is to allow the dusty material to fall directly into the small-diameter material on the conveyor belt, achieving synchronous conveying and uniform mixing of the two materials. When the pelletizing process starts, the material in the small-diameter material silo is conveyed to the pelletizing device through the sixth conveying device. At the same time, the dusty material stored in the dust silo falls vertically onto the bearing surface of the sixth conveying device through its discharge port. The two materials form a mixed layer during the conveying process through mechanical vibration or gravity, and are then conveyed to a pelletizing device for processing.

[0031] In this invention, the feeder refers to a device for controlling the material conveying volume, specifically a disc feeder, which controls the material flow rate by adjusting the rotation speed. The first weighing device refers to a device for real-time monitoring of material weight, specifically a belt scale, which achieves material proportioning control through dynamic weighing. The ash discharge valve refers to a valve for controlling powder discharge, specifically a star-shaped ash discharge valve, which achieves sealing and quantitative discharge through rotating blades. The second weighing device refers to a device for accurately measuring the powder weight, specifically a screw scale, which achieves continuous measurement through an integrated screw conveyor and weighing structure. The humidification device refers to a device for adjusting the humidity of the material, specifically a water spray device, which suppresses dust diffusion through atomized humidification.

[0032] In this invention, a vibrator refers to a mechanical device installed on the side wall of a silo, used to prevent material from accumulating or clogging on the silo wall through vibration. Specifically, an electromagnetic vibrator or a pneumatic vibrator can be used. This device maintains the flow of material within the silo through periodic vibration, preventing material adhesion that could hinder material flow. In this design, the vibrator's function is to solve the problem of bridging caused by humidity or electrostatic adsorption of fine particles and dust, ensuring that material continuously and uniformly enters subsequent conveying or processing stages. When material in the small-particle-size silo and dust silo adheres due to its small particle size or high humidity, the vibrator is triggered. Vibration energy is transferred through the silo wall to the material layer, disrupting the electrostatic force or surface tension between the materials, causing the material to detach from the silo wall and fall along the direction of gravity.

[0033] In this invention, the multi-pole iron separator refers to a magnetic separation device composed of multiple alternating magnetic pole units, specifically implemented using a modular structure combining permanent magnets and electromagnetic coils. This device, through the gradient magnetic field generated by the multiple magnetic poles, can create a continuously varying magnetic field strength along the width of the conveyor belt, thereby enhancing its ability to adsorb ferromagnetic impurities in the material. In the process of treating waste materials from steel smelting, the multi-pole design can effectively handle lumpy, flaky, and powdery iron components mixed in the material, avoiding iron residues caused by uneven magnetic field coverage in single-pole equipment. The multi-pole iron separator is positioned above the first conveying device, with its magnetic pole units arranged at intervals along the material conveying direction. When waste material containing iron impurities passes through, the alternating magnetic poles form an alternating magnetic field region, causing the ferromagnetic material to undergo multiple magnetization-demagnetization cycles during conveying. This design not only enhances the capture ability of fine iron filings but also causes the iron components to shift through changes in the magnetic field gradient, ultimately being adsorbed onto the surface of the iron separator. The separated iron impurities are collected through independent channels to prevent re-mixing into the material flow.

[0034] In this invention, the screening equipment refers to a device that separates materials according to particle size through mechanical vibration or rotation. Specifically, it can be a vibrating screen, drum screen, or probability screen. Its core function is to separate mixed materials into coarse and fine particles according to a preset particle size range. A screen aperture of 6-15mm refers to the range of screen hole sizes used for material separation in the screening equipment. This can be achieved by adjusting the screen mesh size or replacing screen plates with different specifications. This range balances processing efficiency and sorting accuracy, ensuring that fine particles meet the requirements for subsequent pelletizing or recycling. The screening equipment uses vibration or rotation to drive waste materials to move on the screen surface. Materials with a particle size smaller than the screen aperture pass through the screen holes and enter the fine material outlet, while larger particles are discharged from the coarse material outlet. When the screen aperture is set to 6-15mm, it can effectively separate fine materials suitable for pelletizing processes (e.g., dust with a particle size less than 3mm) and coarse materials suitable for iron or steelmaking (e.g., particles with a particle size greater than 12mm). After grading, the materials are conveyed into drying units or small-particle-size material bins to achieve classified processing and resource utilization.

[0035] Compared with the prior art, the technical solution provided by this utility model has the following beneficial technical effects:

[0036] 1. This utility model establishes a comprehensive recycling system for waste materials from iron and steel smelting, which can perform fine processing on all particle size input waste materials, classify and utilize waste by particle size, and process it in different systems to achieve resource recycling without having a significant impact on subsequent processes.

[0037] 2. Using the comprehensive utilization system of this utility model, the magnetic ferromagnetic materials in the system are directly transported to the steelmaking system after magnetic separation; the large-particle waste materials in the system are screened, dried by a dryer, and directly transported to the ironmaking system; the small-particle materials in the system are precisely batched and then mixed with the iron raw materials in the primary material yard before entering the sintering system.

[0038] 3. The comprehensive utilization system of this utility model realizes the comprehensive recycling and utilization of valuable steel smelting waste materials, which can reduce the demand for raw materials, help reduce waste emissions and realize the recycling of resources. Attached Figure Description

[0039] Figure 1 A schematic diagram of the structure of a comprehensive recycling system for waste materials from iron and steel smelting provided by this utility model;

[0040] Figure 2 A schematic diagram of the overall system structure provided by this utility model.

[0041] Figure label:

[0042] 1: Waste material silo; 2: Iron removal device; 3: Grading device; 4: Drying device; 5: Small particle size material silo; 6: Steelmaking equipment; 7: Ironmaking equipment; 8: Pelletizing device; 9: Dust silo; 10: Feeder; 11: First weighing device; 12: Ash discharge valve; 13: Second weighing device; 14: Humidification device; S1: First conveying device; S2: Second conveying device; S3: Third conveying device; S4: Fourth conveying device; S5: Fifth conveying device; S6: Sixth conveying device. Detailed Implementation

[0043] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0044] A comprehensive recycling system for waste materials from iron and steel smelting is disclosed. The system includes a waste material silo 1, an iron removal device 2, a grading device 3, a drying device 4, a small-diameter material silo 5, a first conveying device S1, a second conveying device S2, and a third conveying device S3. The first conveying device S1 connects the outlet of the waste material silo 1 to the inlet of the grading device 3. The iron removal device 2 is positioned above the first conveying device S1. The grading device 3 includes a coarse material outlet and a fine material outlet. The second conveying device S2 connects the coarse material outlet of the grading device 3 to the drying device 4. The third conveying device S3 connects the fine material outlet of the grading device 3 to the small-diameter material silo 5.

[0045] Preferably, the system also includes a steelmaking device 6 and a fourth conveying device S4. The fourth conveying device S4 is connected to the discharge port of the iron removal device 2 and the feed port of the steelmaking device 6.

[0046] Preferably, the system also includes an ironmaking device 7 and a fifth conveying device S5. The fifth conveying device S5 is connected to the discharge port of the drying device 4 and the feed port of the ironmaking device 7.

[0047] Preferably, the system also includes a pelletizing device 8 and a sixth conveying device S6. The sixth conveying device S6 is connected to the discharge port of the small particle size material bin 5 and the inlet of the pelletizing device 8.

[0048] Preferably, the system also includes a dust hopper 9. The outlet of the dust hopper 9 is located above the sixth conveying device S6.

[0049] Preferably, a feeder 10 and a first weighing device 11 are provided between the discharge port of the small particle size material silo 5 and the sixth conveying device S6. A dust discharge valve 12, a second weighing device 13 and a humidifying device 14 are provided between the discharge port of the dust silo 9 and the sixth conveying device S6.

[0050] Preferably, a vibrator is installed on the side wall of the small particle size material silo 5. A vibrator is installed on the side wall of the dust silo 9.

[0051] Preferably, the iron removal device 2 is a multi-pole iron remover.

[0052] Preferably, the grading device 3 is a screening device with a screen aperture of 6-15mm.

[0053] Preferably, the first weighing device 11 is a belt scale. The second weighing device 13 is a screw scale. The feeder 10 is a disc feeder. The ash discharge valve 12 is a rotary valve. The humidification device 14 is a water spray device.

[0054] Example 1

[0055] like Figure 1 As shown, a comprehensive recycling system for waste materials from iron and steel smelting is disclosed. The system includes a waste material silo 1, an iron removal device 2, a grading device 3, a drying device 4, a small-diameter material silo 5, a first conveying device S1, a second conveying device S2, and a third conveying device S3. The first conveying device S1 connects the outlet of the waste material silo 1 to the inlet of the grading device 3. The iron removal device 2 is positioned above the first conveying device S1. The grading device 3 includes a coarse material outlet and a fine material outlet. The second conveying device S2 connects the coarse material outlet of the grading device 3 to the drying device 4. The third conveying device S3 connects the fine material outlet of the grading device 3 to the small-diameter material silo 5.

[0056] Example 2

[0057] like Figure 2 As shown, Embodiment 1 is repeated, except that the system also includes steelmaking equipment 6 and a fourth conveying device S4. The fourth conveying device S4 is connected to the discharge port of the iron removal device 2 and the feed port of the steelmaking equipment 6.

[0058] Example 3

[0059] like Figure 2 As shown, Embodiment 1 is repeated, except that the system also includes an ironmaking device 7 and a fifth conveying device S5. The fifth conveying device S5 is connected to the discharge port of the drying device 4 and the feed port of the ironmaking device 7.

[0060] Example 4

[0061] like Figure 2 As shown, Embodiment 1 is repeated, except that the system also includes a pelletizing device 8 and a sixth conveying device S6. The sixth conveying device S6 is connected to the outlet of the small particle size material bin 5 and the inlet of the pelletizing device 8.

[0062] Example 5

[0063] The system repeats Example 4, except that it also includes a dust hopper 9. The outlet of the dust hopper 9 is located above the sixth conveying device S6.

[0064] Example 6

[0065] Example 5 is repeated, except that a feeder 10 and a first weighing device 11 are provided between the discharge port of the small particle size material silo 5 and the sixth conveying device S6. An ash discharge valve 12, a second weighing device 13 and a humidifying device 14 are provided between the discharge port of the dust silo 9 and the sixth conveying device S6.

[0066] Example 7

[0067] Example 5 is repeated, except that a vibrator is provided on the side wall of the small particle size material silo 5. A vibrator is provided on the side wall of the dust silo 9.

[0068] Example 8

[0069] The same embodiment 1 is repeated, except that the iron removal device 2 is a multi-pole iron remover.

[0070] Example 9

[0071] Repeat Example 1, except that the grading device 3 is a screening device with a screen aperture of 10mm.

[0072] Example 10

[0073] Example 6 is repeated, except that the first weighing device 11 is a belt scale, the second weighing device 13 is a screw scale, the feeder 10 is a disc feeder, the ash discharge valve 12 is a rotary valve, and the humidification device 14 is a water spray device.

[0074] The process of comprehensive solid waste utilization using the system of this utility model is as follows: A feeding device (e.g., a truck) delivers various steel smelting waste materials to a waste utilization shed for storage. A grab crane then piles and removes the waste materials to a waste utilization storage silo. Before entering the screening equipment via the first conveying device, the materials in the silo pass through an iron remover to directly separate ferromagnetic substances. They are then conveyed to the steelmaking system for direct smelting via a fourth conveying device (to the steelmaking system). Waste materials not removed by the iron remover enter the screening equipment, which performs particle size classification. Waste materials with a size <10mm after screening are stored in a graded storage silo and then unloaded sequentially via a disc feeder and a batching belt scale to a sixth conveying device. Powdered waste materials loaded in sealed tank trucks are pneumatically conveyed to a waste dust silo. The powdered waste materials are then unloaded sequentially via a rotary valve, a screw scale, and a screw humidifier to the sixth conveying device. Materials in the graded storage bins and waste dust bins on the sixth conveying device are metered and then mixed and conveyed to the primary material yard for mixing and batching with iron raw materials before being sent to the sintering or pelletizing system for processing. Waste materials ≥10mm on the sieve after screening are sent to the dryer for drying via the second conveying device. After drying, the waste materials ≥10mm are weighed and sent to the ironmaking system for processing.

[0075] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A comprehensive recycling system for waste materials from iron and steel smelting, characterized in that: The system includes a waste material silo (1), an iron removal device (2), a grading device (3), a drying device (4), a small particle size material silo (5), a first conveying device (S1), a second conveying device (S2), and a third conveying device (S3); the first conveying device (S1) connects the outlet of the waste material silo (1) to the inlet of the grading device (3); the iron removal device (2) is located above the first conveying device (S1); the grading device (3) includes a coarse material outlet and a fine material outlet; the second conveying device (S2) connects the coarse material outlet of the grading device (3) to the drying device (4); and the third conveying device (S3) connects the fine material outlet of the grading device (3) to the small particle size material silo (5).

2. The system according to claim 1, characterized in that: The system also includes steelmaking equipment (6) and a fourth conveying device (S4); the fourth conveying device (S4) is connected to the discharge port of the iron removal device (2) and the feed port of the steelmaking equipment (6).

3. The system according to claim 1, characterized in that: The system also includes an ironmaking device (7) and a fifth conveying device (S5); the fifth conveying device (S5) is connected to the outlet of the drying device (4) and the inlet of the ironmaking device (7).

4. The system according to claim 1, characterized in that: The system also includes a pelletizing device (8) and a sixth conveying device (S6); the sixth conveying device (S6) connects the outlet of the small particle size material bin (5) and the inlet of the pelletizing device (8).

5. The system according to claim 4, characterized in that: The system also includes a dust silo (9); the outlet of the dust silo (9) is located above the sixth conveyor (S6).

6. The system according to claim 5, characterized in that: A feeder (10) and a first weighing device (11) are provided between the outlet of the small particle size material silo (5) and the sixth conveying device (S6); an ash discharge valve (12), a second weighing device (13) and a humidifying device (14) are provided between the outlet of the dust silo (9) and the sixth conveying device (S6).

7. The system according to claim 5 or 6, characterized in that: A vibrator is installed on the side wall of the small particle size material silo (5); a vibrator is installed on the side wall of the dust silo (9).

8. The system according to claim 1, characterized in that: The iron removal device (2) is a multi-pole iron remover.

9. The system according to claim 1, characterized in that: The grading device (3) is a screening device with a screen aperture of 6-15mm.

10. The system according to claim 6, characterized in that: The first weighing device (11) is a belt scale; the second weighing device (13) is a screw scale; the feeder (10) is a disc feeder; the ash discharge valve (12) is a star-shaped ash discharge valve; and the humidification device (14) is a water spray device.

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