Resource recycling process system for steel powder solid waste of steel plant

Abstract

The utility model discloses a steel plant steel powder solid waste resource recycling process system, which is characterized in that a control module regulates and controls each unit to operate, and a mixing and proportioning unit mixes various powder solid wastes with an organic adhesive in proportion; the wheel grinding and mixing unit grinds large raw materials; the stirring and mixing unit enables materials to be loose and uniform; the first-stage screening unit is used for screening material granularity; the second-stage mixing unit is used for adding an additive to optimize the mixture; the automatic material distribution unit is used for accurately distributing materials and recycling scattered materials; the cold-press forming unit is used for manufacturing particle steel cold-pressed blocks with different shapes and sizes; the finished product screening unit performs stage treatment on the cold-pressed blocks; and the dust removal and recovery unit realizes zero emission of dust in the whole process. The device has the advantages of high-efficiency recycling, automatic control, environmental protection, energy conservation, flexibility and adjustability, can realize cooperative treatment and high-added-value conversion of powder solid wastes, reduces the enterprise cost, meets the green development requirement of the iron and steel industry, and can be widely applied to the field of solid waste treatment of iron and steel enterprises.

Description

Technical Field

[0001] This utility model relates to the field of solid waste treatment technology in the steel industry, and in particular to a process system for the resource-based recycling of steel powder solid waste from steelmaking plants. Background Technology

[0002] In recent years, my country's crude steel production has exceeded 1 billion tons, with steel slag and steel powder waste generated during steelmaking accounting for 10% to 30%. Their recycling is of great significance, as it not only enables the recycling of steel powder waste but also reduces the cost of waste disposal in steel plants, decreasing land resource waste and environmental pollution. Compared with the United States, Europe, and Japan, my country's utilization rate of steel powder waste is low. It is mainly used as industrial waste in building materials, with the remainder being stockpiled and landfilled. This results in a significant waste of land resources, and infiltration leads to serious pollution of groundwater and air, greatly increasing the pollution control and solid waste disposal costs for steel enterprises. Therefore, exploring the resource-based recycling and utilization of steel powder solid waste is urgently needed.

[0003] In recent years, many research institutions and enterprises have explored the resource-based recycling and utilization of steel powder solid waste, resulting in some achievements. Patents CN117987606A, CN104828850A, CN105197975A, CN108840362A, CN116462217A, and CN114293035A have invented methods for regulating the cooling process of steel slag to achieve resource utilization, extracting free calcium oxide from steel slag using acetic acid, various methods for preparing calcium carbonate from steel slag, and methods for preparing calcium carbonate from vanadium-containing steel slag. These inventions have promoted the resource-based recycling and utilization of steel powder solid waste. However, problems such as complex processes, high energy consumption, and insufficient resource utilization efficiency still exist. In particular, the technologies for the synergistic treatment and high-value-added conversion of multiple types of powder solid waste urgently need improvement. Utility Model Content

[0004] The purpose of this utility model is to provide a process system for the resource recycling of steel powder solid waste from steelmaking plants. Through modular design and automated control, it can achieve efficient mixing, forming and zero dust emission of powder solid waste, thereby improving the efficiency of resource utilization.

[0005] To achieve the above objectives, this utility model provides a process system for the resource-based recycling of steel powder solid waste from steelmaking plants, comprising a mixing and proportioning unit, a roller mill mixing unit, a stirring and mixing unit, a primary screening unit, a secondary mixing unit, an automatic feeding unit, a cold pressing and forming unit, a finished product screening unit, and a dust removal and recycling unit connected in sequence; the system regulates each unit through a control module.

[0006] Preferably, the mixing and proportioning unit includes a steel powder silo, an organic binder storage tank, and a metering system, used to mix fine particles of steel slag powder, iron oxide, converter sludge, aluminum shavings, dust collector ash, shot blasting ash, automotive slag powder, electric furnace slag powder, zinc slag powder, and iron powder with the organic binder, and then conveys them to a twin-shaft mixing device for preliminary mixing via a feeder.

[0007] Preferably, the roller mill mixing unit includes a closed roller mill for receiving the mixture output from the twin-shaft mixing equipment, and for crushing large raw materials to less than 0.5mm through fine mixing, compaction and crushing.

[0008] Preferably, the mixing unit includes a twin-shaft mixer for low-speed mixing of the material after roller milling, so that the mixture is loose and uniform.

[0009] Preferably, the primary screening unit includes an inspection screening device that classifies the stirred material under the action of a vibration field.

[0010] Preferably, the secondary mixing unit includes a secondary twin-shaft mixing device and an additive silo, used to add additives to the primary screened qualified materials. The additives include trace elements, specific functional materials, clay, flux, toughening fibers, anti-aging agents, and color masterbatches.

[0011] Preferably, the automatic material distribution unit includes a belt conveyor and an automatic material distribution machine. The material distribution amount can be set according to the mold. The material spilled during the material distribution process is returned to the secondary mixing unit through a recycling device.

[0012] Preferably, the cold pressing unit includes a YL-3000 hydraulic forming machine, which presses the mixture into cold-pressed particle steel blocks. The shape of the blocks includes cylindrical, triangular, conical, rectangular, or cubic shapes, and the size is adjusted by a mold.

[0013] Preferably, the finished product screening unit includes a roller screen for classifying surface-adhered particles, slag, and defective products of cold-pressed blocks. The undersized material is returned to the roller mill mixing stage, and the oversized finished product is stored or magnetically treated.

[0014] Preferably, the dust collection and recycling unit adopts negative pressure dust collection technology, and dust collection devices are set up in the mixing ratio, wheel milling, stirring and mixing, inspection and screening, material distribution and cold pressing stages. The recovered powder is returned to the secondary mixing unit.

[0015] Therefore, the present invention employs the above-mentioned process system for the resource recovery and utilization of steel powder solid waste from steelmaking plants, and has the following technical effects:

[0016] (1) High-efficiency resource utilization: Through multi-stage mixing, screening and molding technology, the co-processing of various powder solid wastes such as steel slag powder and converter sludge is realized, and high-value-added particle steel cold-pressed blocks are prepared to improve the utilization rate of solid waste.

[0017] (2) Automated control: The control module regulates the operating parameters of each unit, resulting in low power consumption and high operating efficiency;

[0018] (3) Environmental protection and energy saving: The whole process of negative pressure dust removal achieves zero dust emission, and cold pressing molding does not require a heat source, reducing energy consumption and pollution.

[0019] (4) Flexible and adjustable: Through mold and parameter settings, the shape, size and density of the briquette can be flexibly adjusted to meet the needs of different customers.

[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a process system for the resource-based recycling of steel powder solid waste from a steelmaking plant, according to this utility model.

[0022] Figure 2 This is a flowchart of a process system for the resource recycling and utilization of steel powder solid waste from a steelmaking plant, according to this utility model. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0024] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figures 1 to 2As shown, a resource recycling process system for steel powder solid waste from a steelmaking plant includes a mixing and proportioning unit, a roller mill mixing unit, a stirring and mixing unit, a primary screening unit, a secondary mixing unit, an automatic feeding unit, a cold pressing and forming unit, a finished product screening unit, and a dust removal and recovery unit connected in sequence; the system regulates each unit through a control module.

[0026] Mixing and proportioning unit: includes steel powder silo, organic binder storage tank and metering system, used to store fine particulate solid waste such as steel slag powder, iron oxide, converter sludge and organic binder. After being proportioned by the metering system, it is conveyed by the feeder to the twin-shaft mixing equipment for preliminary mixing to ensure that the materials and binder are initially in uniform contact.

[0027] Roller mill mixing unit: Equipped with a closed roller mill, it receives the mixture output from the twin-shaft mixing equipment. Through mixing, compaction and crushing, large raw materials are ground to less than 0.5mm, increasing the specific surface area of ​​the material and promoting the full combination of binder and solid waste particles.

[0028] Mixing unit: A two-stage twin-shaft mixing device is used to mix the material after roller milling for 5 minutes, so that the mixture is loose and uniform, providing a good material state for subsequent screening and additive mixing.

[0029] Primary screening unit: Equipped with inspection screening equipment, the stirred material is classified under the action of vibration force field. The undersize material (<0.5mm) enters the secondary mixing unit, and the oversize material (≥0.5mm) is returned to the roller mill mixing unit for reprocessing to ensure that the particle size of the material meets the molding requirements.

[0030] Secondary mixing unit: Includes twin-shaft mixing equipment and additive silo. Add 0.1% to 5% additives to the qualified material screened in the primary stage. The additives include trace elements, clay, flux, etc. Mix for 5 to 8 minutes to fully mix the material and additives. Control the proportion of large particles in the mixture to 20% to 40%, medium particles to 30% to 50%, and fine powder to 20% to 40% to ensure the compactness of the molding.

[0031] Automatic material distribution unit: Composed of belt conveyor and automatic material distribution machine, the material distribution amount can be set to 20-50kg / time according to the mold. The material spilled during the distribution process is returned to the secondary mixing unit through the recycling device to avoid material waste.

[0032] Cold pressing unit: Using a YL-3000 hydraulic forming machine, the mixed materials are pressed into cold-pressed steel granules under a dynamically adjustable hydraulic pressure of 0 to 315 bar. The shape and size of the granules can be adjusted by the mold to meet the needs of different application scenarios.

[0033] Finished product screening unit: A roller screen is set up to classify the cold-pressed blocks by removing surface-adhered particles, slag and defective products. The undersize material is returned to the roller mill mixing process for recycling, and the oversize finished product is stacked or magnetically treated to improve the quality of the finished product.

[0034] Dust collection and recovery unit: Adopting negative pressure dust collection technology, dust collection devices are set up in each stage such as mixing and proportioning, and wheel milling. The recovered powder is returned to the mixing and proportioning unit, achieving zero dust emission throughout the process, which meets environmental protection requirements.

[0035] This utility model provides a disposal method for a steel mill steel powder solid waste resource recycling process system, including the following steps:

[0036] S1. Mixing ratio

[0037] In steel mills, fine particles such as steel slag powder, iron oxide, converter sludge, aluminum shavings, dust collector ash, shot blasting ash, automotive slag powder, electric furnace slag powder, zinc slag powder, and iron powder are stored separately in steel powder silos. These particles are then mixed according to a specific ratio using a metering system. Simultaneously, an organic binder is removed from its storage tank and transported along with the solid waste particles to a twin-shaft mixing unit via a feeder. The twin-shaft mixing unit is then activated to initially mix the materials, ensuring thorough contact between the solid waste particles and the organic binder.

[0038] S2. Roller mixing

[0039] The mixed powder prepared in step S1 is mixed with steel powder and organic binder by a twin-shaft mixing device, and then fed into a closed roller mill for a second fine mixing and compaction. This process ensures that the raw materials and organic binder are in full contact, while also crushing large pieces of raw materials into small particles, increasing the specific surface area of ​​the mixture, and ensuring that the organic binder and steel powder are fully mixed.

[0040] S3. Stir and mix

[0041] The material after roller milling enters a twin-shaft mixing device and is mixed at low speed for 5 minutes, with a rotation speed of 20-30 r / min. During this process, the mixture becomes loose and uniform, preparing it for subsequent processes.

[0042] S4. Primary screening

[0043] The steel and organic binder mixture, which is thoroughly mixed by the twin-shaft mixing equipment in step S3, is fed into the inspection screening equipment. Under the action of the vibration field, the mixed powder particles are broken up again and screened and graded. Particles smaller than 0.5mm pass through the screen and become the undersize material as qualified raw material. Mixed particles larger than 0.5mm are returned to the enclosed roller mill for further crushing.

[0044] S5. Secondary mixing

[0045] The sieved material from step S4 is fed into a secondary mixing twin-shaft mixer, and 0.1% to 5% additives are added. The additives include trace elements, clay, flux, toughening fibers, anti-aging agents, color masterbatches, etc., depending on the process requirements. The powder raw materials and additives are mixed thoroughly for 5 to 8 minutes. The mixture should contain 20% to 40% large particles, 30% to 50% medium particles, and 20% to 40% fine powder to ensure the compactness of subsequent molding and the strength after sintering.

[0046] S6. Automatic Fabric Distribution

[0047] The material discharged from the secondary mixing twin-shaft mixer in step S5 is sent to the automatic material distributor via a belt conveyor for automatic material distribution. The material distribution amount can be set to 20-50 kg / time depending on the mold. The distributed material is then returned to the secondary mixing twin-shaft mixer via a recycling device.

[0048] S7. Cold pressing

[0049] The mixture from the automatic material feeding system in step S6 is pressed into cold-pressed steel granules using a YL-3000 hydraulic forming machine under a dynamically adjustable hydraulic pressure of 0–315 bar. The shape of the cold-pressed granules can be set to cylindrical, triangular, conical, rectangular, or cubic shapes, depending on the mold. The equivalent diameter of the granules is φ = 50–200 mm, the height is h = 10–60 mm, the weight is m = 1–10 kg / piece, and the density is ρ = 4000–6500 kg / m³. 3 The above parameters can be adjusted according to process requirements; the hydraulic forming machine cold presses 5 to 10 blocks at a time, and presses blocks 3 times per minute. The cold pressing frequency and the number of blocks can be adjusted.

[0050] S8. Finished Product Screening

[0051] After the cold-pressed blocks are formed in step S7, they are graded by roller screen to remove surface-adhered particles, slag, and defective products. The material under the roller screen is returned to the roller mill mixing stage, and the finished product on the screen is effectively stacked or magnetized for reuse.

[0052] S9. Dust Removal and Recycling

[0053] In the S1-S8 process system, dust is recovered through negative pressure dust removal technology in all stages, including steel powder solid waste mixing and proportioning, roller milling, stirring and mixing, inspection and screening, material distribution, and cold pressing. The recovered powder is then fed into the steel powder solid waste mixing and proportioning stage, achieving zero dust emissions throughout the entire production process and meeting environmental protection standards with high quality.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A process system for the resource-based recycling and utilization of steel powder solid waste from steelmaking plants, characterized in that: The system includes a mixing and proportioning unit, a roller mill mixing unit, a stirring and mixing unit, a primary screening unit, a secondary mixing unit, an automatic material distribution unit, a cold pressing and forming unit, a finished product screening unit, and a dust removal and recovery unit connected in sequence; the system controls each unit through a control module.

2. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The mixing and proportioning unit includes a steel powder silo, an organic binder storage tank, and a metering system.

3. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The roller mill mixing unit includes a closed roller mill for receiving the mixture output from the twin-shaft mixing equipment and crushing large pieces of raw material through agitation, compaction and crushing.

4. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The mixing unit includes a twin-shaft mixer for low-speed mixing of the material after roller milling, with a rotation speed of 20~30 r / min, so that the mixture is loose and uniform.

5. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The primary screening unit includes an inspection screening device that classifies the stirred material under the action of a vibration field.

6. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The secondary mixing unit includes a secondary mixing twin-shaft agitator and an additive silo, used to add additives to the primary screened qualified materials.

7. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The automatic material distribution unit includes a belt conveyor and an automatic material distribution machine. The material distribution amount can be set according to the mold. The material spilled during the material distribution process is returned to the secondary mixing unit through a recycling device.

8. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The cold pressing unit includes a YL-3000 hydraulic forming machine, which presses the mixed materials into cold-pressed particle steel blocks. The block shapes include cylindrical, triangular, conical, rectangular, or cubic shapes, and the dimensions are adjusted by a mold.

9. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The finished product screening unit includes a roller screen, which is used to classify the cold-pressed blocks for surface-adhered particles, slag and defective products. The undersize material is returned to the roller mill mixing stage, and the oversize finished product is stored or magnetically treated.

10. The resource recovery and utilization process system for steel powder solid waste from steelmaking plants according to claim 1, characterized in that: The dust collection and recovery unit adopts negative pressure dust collection technology. Dust collection devices are set up in the mixing ratio, wheel milling, stirring and mixing, inspection and screening, material distribution and cold pressing stages. The recovered powder is returned to the secondary mixing unit.

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