A molten steel slag mixing solidification and crushing system and method

Abstract

This application provides a molten steel slag mixing, solidification, and crushing system and method. The system includes a processing chamber, a mixing zone, a slag dumping device, a feeding device, a stirring and crushing device, a screening device, and a dust removal device. The slag dumping device and the mixing zone are located in the processing chamber. The slag dumping device is used to dump molten steel slag into the mixing zone. The feeding device is used to send solid cooling medium into the mixing zone. The stirring and crushing device is located in the mixing zone and is used to stir and mix the molten steel slag with the solid cooling medium, so that the molten steel slag cools, solidifies, and is crushed into granules. The screening device is located on one side of the mixing zone and is used to separate and output the crushed and granulated steel slag according to particle size. The dust removal device is connected to the processing chamber. This application achieves efficient cooling and crushing by mixing solid cooling medium with molten steel slag, integrates a screening device to simplify the process flow, and adopts closed treatment and dust removal to improve environmental performance. It has the advantages of high waste heat recovery efficiency, high processing efficiency, low investment cost, and good environmental performance.

Description

Technical Field

[0001] This application relates to the field of molten steel slag treatment technology, and in particular to a molten steel slag mixing, solidification and crushing system and method. Background Technology

[0002] In the iron and steel smelting industry, molten steel slag is a high-temperature liquid byproduct produced during the iron and steel smelting process. Its temperature can reach over 1200℃ and it contains a large amount of waste heat resources.

[0003] In the relevant technical solutions, the treatment of molten steel slag mainly relies on water cooling process, which achieves rapid cooling by direct contact between water and high-temperature steel slag, followed by mechanical crushing, granulation and other processes for resource utilization.

[0004] However, while water cooling can quickly cool molten steel slag using related technologies, the large amount of steam and dust generated during the cooling process is difficult to recover effectively, resulting in a waste of waste heat resources. At the same time, the cooled steel slag needs to be mechanically crushed to meet the granulation requirements, but the crushing efficiency is low and the equipment is prone to blockage due to steel slag agglomeration. Summary of the Invention

[0005] This application provides a molten steel slag mixing, solidification, and crushing system and method to achieve efficient cooling, solidification, crushing, and granulation of molten steel slag, while fully recovering waste heat resources, reducing investment and operating costs, and improving environmental performance.

[0006] In a first aspect, embodiments of this application provide a molten steel slag mixing, solidification, and crushing system, comprising:

[0007] Processing room;

[0008] The mixing area is located within the processing chamber;

[0009] A slag-pouring device, installed in the processing chamber, is used to pour molten steel slag into the mixing zone;

[0010] A feeding device, connected to the processing chamber, is used to feed solid cooling medium into the mixing zone;

[0011] A mixing and crushing device is installed in the mixing zone to mix the molten steel slag with the solid cooling medium, thereby cooling, solidifying, and crushing the molten steel slag into granules.

[0012] A screening device is installed on one side of the mixing zone to separate and output the crushed and granulated steel slag according to its particle size.

[0013] The dust removal device is connected to the processing chamber.

[0014] In one possible implementation, the mixing zone includes a base plate and a cushion layer, the base plate being laid on the bottom wall of the processing chamber, and the cushion layer being laid on the base plate.

[0015] In one possible implementation, the slag dumping device includes a slag storage tank and a slag dumping machine. The slag storage tank is connected to the slag dumping machine, and the output end of the slag dumping machine is located above the mixing zone. The molten steel slag is dumped above the cushion layer by the slag dumping machine.

[0016] In one possible implementation, the feeding device includes a conveyor, a cold slag hopper, and a discharge valve. The output end of the conveyor is connected to the opening of the cold slag hopper, and the conveyor transports the solid cooling medium into the cold slag hopper.

[0017] The cold slag hopper is positioned above the mixing zone; the discharge valve is installed at the discharge port at the bottom of the cold slag hopper.

[0018] In one possible implementation, the mixing and crushing device includes a rotating roller tooth structure movably disposed within the processing chamber, the movement path of which covers the mixing zone and the area where the screening device is located.

[0019] In one possible implementation, the rotating roller tooth structure includes a first crushing roller tooth and a second crushing roller tooth arranged sequentially along the direction of motion; the rotational speed of the first crushing roller tooth is lower than that of the second crushing roller tooth.

[0020] In one possible implementation, the screening device includes a high-temperature screen, a first slag chute, and a second slag chute; the high-temperature screen is used to screen the crushed and granulated steel slag into undersize material and oversize material.

[0021] The first slag chute is connected to the high-temperature screen and is used to discharge the undersize material.

[0022] The second slag chute is connected to the high-temperature screen and is used to discharge the material on the screen;

[0023] The second slag chute is connected to the slag receiving car.

[0024] In one possible implementation, the slag receiving vehicle is an electrically driven transport vehicle with a steel structure, used to transport the material on the screen.

[0025] In one possible implementation, the dust removal device includes an exhaust duct, one end of which is connected to the processing chamber and the other end of which is connected to a dust collector.

[0026] In one possible implementation, the processing chamber includes a sealed enclosure structure, the top of which is provided with an openable top door for hoisting the slag removal device in and out.

[0027] The sealed enclosure structure is equipped with an inspection door on its side.

[0028] Secondly, embodiments of this application provide a method for solidifying and crushing molten steel slag mixtures, applied in the aforementioned system, the method comprising:

[0029] Molten steel slag is mixed with a solid cooling medium to form a mixture.

[0030] The mixture is stirred and crushed by a stirring and crushing device to obtain crushed material;

[0031] The crushed material is separated according to its particle size using a screening device.

[0032] In one possible implementation, the mixing of molten steel slag with a solid cooling medium to form a mixture includes:

[0033] The molten steel slag is poured into the mixing zone by a slag dumping device, and the solid cooling medium is added to the mixing zone by a feeding device, so that the molten steel slag and the solid cooling medium are mixed in a preset ratio.

[0034] In one possible implementation, the step of mixing and crushing the mixture using a mixing and crushing device to obtain crushed material includes:

[0035] The mixture is crushed in stages by a multi-stage roller tooth structure, wherein the multi-stage roller tooth includes a first crushing roller tooth and a second crushing roller tooth.

[0036] The mixture is initially crushed by the first crushing roller teeth;

[0037] The material after initial crushing is further crushed by the second crushing roller teeth.

[0038] In one possible implementation, the separation of crushed materials according to particle size by a screening device includes:

[0039] The crushed material is screened into undersize material and oversize material using a high-temperature screen.

[0040] The undersize material is discharged through the first slag chute and used as granulated steel slag.

[0041] The material over the screen is discharged through the second slag chute as blocky steel slag.

[0042] This application provides a molten steel slag mixing, solidification, and crushing system and method. A solid cooling medium (such as low-temperature steel slag) is fed into a mixing zone using a feeding device, where it is directly mixed with high-temperature molten steel slag. Utilizing the high heat capacity of the solid cooling medium, the heat energy of the molten steel slag is efficiently absorbed through physical heat conduction, directly transferring the waste heat to the solid cooling medium. This technique avoids the problem of heat loss with steam in traditional water-cooling processes, enabling the recovery and utilization of previously wasted waste heat and creating favorable conditions for subsequent waste heat recovery processes.

[0043] The molten steel slag and solid cooling medium are mixed in the mixing zone using a stirring and crushing device, achieving integrated cooling, solidification, and crushing. During the stirring process, the solid cooling medium particles are in full contact with the molten steel slag, resulting in rapid cooling. At the same time, the friction and impact between the medium particles accelerate the crushing of the steel slag, avoiding the drawbacks of multiple mechanical crushing steps required in traditional processes, significantly shortening the processing cycle, and improving production efficiency.

[0044] By integrating a screening device directly on one side of the mixing zone, in-situ particle size separation of the crushed and granulated steel slag is achieved, eliminating the need to transport the material to a dedicated screening workshop for secondary processing. This integrated design reduces the equipment footprint, simplifies the process flow, and lowers investment costs in civil engineering, material handling, and equipment procurement.

[0045] By setting up a treatment chamber covering the mixing area, slag discharge device, stirring and crushing device, and screening device, a closed treatment environment is formed, effectively controlling dust overflow and heat radiation dissipation. At the same time, through a "dust removal device" connected to the treatment chamber, dust-laden gases generated during the treatment process can be effectively collected and purified, avoiding the problems of equipment corrosion and high maintenance costs of wet dust removal systems in traditional water-cooled processes, and significantly improving the environmental performance of the system. Attached Figure Description

[0046] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0047] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0048] Figure 2 This is a flowchart illustrating an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 100. Processing room; 110. Enclosed enclosure structure; 120. Top door; 130. Inspection door;

[0051] 200. Mixing area; 210. Base plate; 220. Subbase;

[0052] 300. Slag dumping device; 310. Molten steel slag; 320. Slag storage tank; 330. Slag dumping machine;

[0053] 400. Feeding device; 410. Solid cooling medium; 420. Conveyor; 430. Cold slag hopper; 440. Discharge valve;

[0054] 500. Mixing and crushing device;

[0055] 600 Screening device; 610 High-temperature screen; 620 First slag chute; 630 Second slag chute; 640 Undersize material; 650 Oversize material; 660 Slag receiving car;

[0056] 700. Dust removal device; 710. Exhaust duct;

[0057] 800, dump truck.

[0058] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features can be combined with each other.

[0060] In the iron and steel smelting industry, molten steel slag is a byproduct of the steelmaking process. Its high-temperature characteristics (typically 1200-1700℃) and physicochemical properties (such as high viscosity and easy agglomeration) make its treatment a critical step in industrial production. Direct discharge of molten steel slag into the environment will not only result in a huge waste of thermal energy but may also cause environmental pollution (such as dust dispersion and harmful gas emissions).

[0061] Currently, industrial treatment of molten steel slag typically involves steps such as cooling, solidification, crushing, and granulation to achieve resource utilization and waste heat recovery. However, traditional processing methods have significant drawbacks: for example, while water cooling can rapidly cool molten steel slag, the large amounts of steam and dust generated during the cooling process are difficult to recover effectively, leading to a waste of waste heat resources; simultaneously, the cooled steel slag needs to be mechanically crushed to meet granulation requirements, but the crushing efficiency is low and the equipment is prone to blockage due to slag agglomeration. Furthermore, traditional processes have insufficient environmental pollution control capabilities and high system investment and operating costs.

[0062] To overcome the shortcomings of existing technologies, this application proposes a molten steel slag mixing, solidification, and crushing system and method. By mixing cold slag as a cooling medium with molten steel slag, the system utilizes the physical thermal conductivity of the cold slag to achieve efficient cooling, solidification, and crushing of the molten steel slag. Simultaneously, through an integrated closed-system design, it achieves synergistic optimization of waste heat recovery and granulated steel slag production. This application breaks through the limitations of traditional water-cooling or air-cooling processes by replacing the cooling medium from water or air with low-temperature steel slag particles. Utilizing the friction and thermal conductivity characteristics between steel slag particles, it achieves rapid cooling and granulation of the molten steel slag, while the closed-system design reduces dust diffusion and heat loss.

[0063] Based on the physical properties of molten steel slag (such as high heat capacity and easy agglomeration) and the shortcomings of existing processes, this application proposes to replace water or air in traditional water-cooling or air-cooling processes with low-temperature steel slag particles (cold slag). Utilizing the high heat capacity and inter-particle friction characteristics of the cold slag, rapid cooling and crushing of the molten steel slag can be achieved. By covering the processing area with a sealed enclosure, processes such as slag dumping, mixing, and screening are integrated, reducing dust diffusion and heat loss. After absorbing the waste heat from the molten steel slag, the cold slag heats up and can be directly used as a heat source for subsequent waste heat recovery systems, achieving heat energy recycling. The mixing and crushing function of the slag mixer replaces the traditional multi-stage crushing process, improving processing efficiency and reducing equipment investment.

[0064] This application constructs a molten steel slag treatment scheme with cold slag mixing as the core and a closed system as the carrier, which solves the core defects of the existing technology, such as low waste heat recovery efficiency and prominent environmental problems.

[0065] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the present invention.

[0066] Figure 1 This is a schematic diagram of the structure of an embodiment of this application; Figure 2 This is a flowchart illustrating an embodiment of this application.

[0067] See Figure 1As shown, a molten steel slag mixing, solidification, and crushing system according to this application includes a processing chamber 100, a mixing zone 200 disposed within the processing chamber 100, a slag dumping device 300, a feeding device 400, a stirring and crushing device 500, a screening device 600, and a dust removal device 700. The slag dumping device 300 is disposed within the processing chamber 100 and is used to dump molten steel slag 310 into the mixing zone 200. The feeding device 400 is connected to the processing chamber 100 and is used to feed solid cooling medium 410 into the mixing zone 200. The stirring and crushing device 500 is disposed within the mixing zone 200 and is used to stir and mix the molten steel slag 310 with the solid cooling medium 410, thereby cooling, solidifying, and granulating the molten steel slag 310. The screening device 600 is disposed on one side of the mixing zone 200 and is used to separate and output the granulated steel slag according to particle size. The dust removal device 700 is connected to the processing chamber 100.

[0068] This application replaces traditional water-cooling media with solid-state cooling media. Through integrated design, it achieves continuous cooling, solidification, crushing, and screening of molten steel slag within the same sealed environment. This overcomes the limitations of traditional water-cooling processes by using low-temperature steel slag particles (solid-state cooling media) as the cooling medium. The high heat capacity of these particles absorbs the heat energy of the molten steel slag, achieving efficient transfer and recovery of waste heat. Simultaneously, the system integrates slag dumping, mixing, stirring and crushing, screening and separation, and dust removal modules within a sealed processing chamber, forming a complete processing chain from molten steel slag input to granulated steel slag output. This eliminates the need for material transfer and significantly simplifies the process.

[0069] In this embodiment, the processing chamber 100 is the core carrier and protective structure of the entire system. The processing chamber 100 integrates core components such as the mixing zone 200, the slag dumping device 300, the stirring and crushing device 500, and the screening device 600 inside to prevent dust from overflowing and heat radiation from escaping during the processing.

[0070] The treatment chamber 100 provides fixed support and movement space for the slag dumping device 300, the mixing and crushing device 500, etc.; it isolates the high temperature and high dust environment to protect the safety of operators; the treatment chamber 100 is connected to the dust removal device 700 to form a negative pressure environment to ensure effective collection of dust-containing gas.

[0071] Preferably, the processing chamber 100 can be a steel structure enclosed enclosure, with the interior sprayed with fire-resistant and heat-insulating materials, which has the characteristics of high temperature resistance, heat insulation and structural strength.

[0072] The steel plates used in the enclosed steel structure enclosure are no less than 5mm thick to ensure sufficient structural strength to withstand the operating loads and thermal stresses of the equipment. The interior of the enclosed enclosure is coated with fire-resistant insulation material for thermal insulation; preferably, a sprayed material with a thickness of no less than 20mm is used. This sprayed material has excellent high-temperature resistance (capable of withstanding temperatures above 1100℃) and a low thermal conductivity, effectively reducing heat loss within the processing chamber and preventing burns to operators from excessively high outer shell temperatures.

[0073] In this embodiment, the mixing zone 200 is the physical space where molten steel slag and solid cooling medium undergo heat exchange and mixing reactions. It is used to receive molten steel slag 310 from the slag dumping device 300 and solid cooling medium 410 from the feeding device 400. The mixing zone 200 provides an operating area for the stirring and crushing device 500, allowing the two materials to come into full contact. At the same time, as a carrier area for heat exchange, it promotes the efficient transfer of heat energy from the molten steel slag 310 to the solid cooling medium 410.

[0074] Optionally, the mixing zone 200 may be equipped with a base plate and a cushion layer. The base plate is a steel structure liner, providing structural support; the cushion layer consists of solid steel slag particles, serving to insulate, prevent sticking, and aid in mixing. The presence of the cushion layer prevents molten steel slag from directly contacting the base plate and causing adhesion, while the gaps between the particles facilitate heat exchange.

[0075] During the processing, the mixing zone 200 needs to have a certain volume to accommodate the mixture of molten steel slag and solid cooling medium for a single batch of processing.

[0076] In this embodiment, the slag dumping device 300 is an input and quantitative control mechanism for molten steel slag 310. It is installed in the processing chamber 100. The slag dumping device 300 works in conjunction with a transport container (such as a liquid slag tank) to receive high-temperature liquid steel slag from the steelmaking process. The molten steel slag 310 is poured into the mixing zone 200 at a controllable rate and angle to ensure that the dumping process is stable and safe.

[0077] The slag dumping device 300 works in conjunction with the top door and other structures of the processing chamber 100 to achieve a closed operation during the input of molten steel slag. Specifically, when the top door is opened, the liquid slag tank is hoisted in; after it is closed, the slag dumping device 300 is activated to dump the slag. The entire process is completed in a closed environment, reducing heat loss and dust spillage.

[0078] The output end of the slag dumping device 300 should be aligned with the mixing zone 200 to ensure that all the molten steel slag 310 falls into the cushion layer area, avoiding spillage that could damage the equipment or make cleaning difficult.

[0079] Preferably, the slag dumping device 300 can be a fixed tilting slag dumper, which can rotate the liquid slag tank 180 degrees to perform slag dumping operations, and the dumping time is controllable.

[0080] The slag slag container is a steel vessel used to hold high-temperature molten steel slag from the steelmaking process. It has a volume of at least 5 m³ to meet the processing requirements of a single batch of molten steel slag; the wall thickness is at least 50 mm to ensure sufficient safety margin when subjected to the thermal shock of high-temperature molten steel slag (1200℃-1700℃) and mechanical loads during transportation. The slag slag container is made of high-strength heat-resistant steel, possessing excellent thermal shock resistance and deformation resistance.

[0081] The liquid slag tanks are transported by 800 slag trucks. These 800 trucks utilize a steel structure, providing sufficient structural strength and stability. As electrically driven vehicles, they achieve zero-emission, low-noise operation, making them suitable for use in enclosed workshop environments. Each 800 truck is equipped with positioning and locking devices for the liquid slag tanks, ensuring safety during transportation.

[0082] In this embodiment, the feeding device 400 is a supply and quantitative control mechanism for the solid cooling medium 410. It is connected to the processing chamber 100 and is used to temporarily store solid cooling media such as low-temperature steel slag to ensure continuous operation of the system. The feeding device 400 feeds the solid cooling medium 410 into the mixing zone 200 according to a preset ratio and mixes it with the molten steel slag 310.

[0083] The feeding device 400 can be linked with the slag dumping device 300 to achieve synchronous feeding. While the slag dumping device 300 dumps the molten steel slag 310, the feeding device 400 simultaneously adds solid cooling medium 410, so that the two begin to mix as they fall into the mixing zone 200, thus optimizing heat exchange efficiency.

[0084] The amount of solid cooling medium 410 added can be dynamically adjusted according to the temperature, viscosity and other characteristics of the molten steel slag 310. For example, for molten steel slag with a higher temperature, the proportion of solid cooling medium added can be appropriately increased to accelerate the cooling rate.

[0085] Preferably, the feeding device 400 may include a conveyor, a cold slag hopper, and a discharge valve. The conveyor (such as a belt conveyor) transports the solid cooling medium from the storage area to the cold slag hopper. The cold slag hopper is a steel structure hopper located above the mixing zone 200, and discharges the material using gravity. The discharge valve is installed at the discharge port at the bottom of the cold slag hopper, and the feeding amount is adjusted by controlling the valve opening. The volume of the cold slag hopper should be not less than 3 m³, and the discharge valve should be able to withstand high temperatures (not less than 200°C).

[0086] Preferably, cold slag (solid steel slag particles) is used as the cooling medium and directly mixed and stirred with molten steel slag. Efficient cooling, solidification and granulation are achieved through heat conduction between steel slag particles and mechanical crushing.

[0087] Cold slag, used as a cooling medium to replace traditional water or air cooling, possesses physical properties (high heat capacity, particle friction) that allow it to directly absorb the waste heat from molten steel slag, completely transferring the waste heat to the cold slag and forming a high-temperature solid steel slag raw material, providing a heat source for subsequent waste heat recovery systems. Simultaneously, the mixing and stirring process between the cold slag and molten steel slag significantly improves cooling efficiency, shortens cooling time, and prevents the formation of a dense layer on the steel slag surface through interparticle heat conduction and mechanical crushing.

[0088] Furthermore, the particle characteristics of the cold slag directly achieve the crushing and granulation of steel slag during the mixing process through friction and shearing, reducing subsequent crushing steps. This technology fundamentally solves the problems of low waste heat recovery rate, insufficient cooling efficiency, and reliance on external equipment for crushing and granulation. At the same time, it reduces media consumption through cold slag recycling, achieving efficient utilization of both energy and resources.

[0089] In this embodiment, the stirring and crushing device 500 is the core actuator of the system and is set in the mixing zone 200. The stirring and crushing device 500 fully stirs and mixes the molten steel slag 310 poured into the mixing zone 200 with the solid cooling medium 410, so that the two are in uniform contact and accelerate heat conduction.

[0090] The stirring and crushing device 500 increases the contact area and relative speed between the molten steel slag 310 and the solid cooling medium 410 through mechanical stirring, thereby accelerating the heat transfer of the molten steel slag 310 and causing it to cool and solidify rapidly.

[0091] The mechanical structure (such as rotating roller teeth) of the mixing and crushing device 500 is used to apply shearing, impact and friction to the solidified steel slag, crushing the solidified steel slag into granulated steel slag with uniform particle size; during the crushing process, the solid cooling medium particles themselves also act as crushing medium, and the crushing effect is enhanced through friction and collision between particles.

[0092] After processing, the crushed and granulated steel slag can be pushed to the screening device 600 to achieve process connection without the need for additional conveying equipment.

[0093] Preferably, the mixing and crushing device 500 can adopt a multi-stage roller tooth structure, including coarse crushing roller teeth and fine crushing roller teeth. The coarse crushing roller teeth are large-sized and low-speed structures, which prioritize the processing of large slag pieces; the fine crushing roller teeth are small-sized and high-speed structures, which refine the granulated steel slag and improve particle size uniformity.

[0094] The mixing and crushing device 500 is movably installed in the processing chamber 100. Its movement path covers the area where the mixing zone 200 and the screening device 600 are located, realizing integrated operation of moving and mixing, mixing and crushing, and crushing and pushing at the same time, reducing the number of equipment and simplifying the control logic.

[0095] Preferably, the mixing and crushing device 500 can adopt a rotating roller tooth structure, with the roller teeth made of high-temperature and wear-resistant alloy steel, capable of withstanding wear and impact under high-temperature conditions. The mixing and crushing processing time can be controlled within 5-20 minutes, and the mass proportion of granulated steel slag with a particle size not exceeding 50mm after processing is not less than 80%.

[0096] In this embodiment, the screening device 600 is the particle size classification and product separation mechanism of the system. It is set on one side of the mixing zone 200. The screening device 600 separates the crushed material after being processed by the mixing and crushing device 500 according to the particle size, distinguishing between granulated steel slag and large slag pieces.

[0097] After screening, materials of different particle sizes are exported separately. Granulated steel slag can be transported to the subsequent waste heat recovery process, while large slag pieces can be collected and returned to the system for further processing or disposed of separately.

[0098] The screening device 600 completes the separation directly next to the mixing zone 200, eliminating the need for material transfer and simplifying the process.

[0099] The screening device 600 must have high temperature resistance and be able to withstand a high-temperature operating environment of not less than 1100℃. Preferably, the screening device 600 can be a high-temperature screen, and the screen aperture size can be set according to process requirements (such as 50mm-200mm) to meet the needs of different product specifications.

[0100] Optionally, the screening device 600 can be a high-temperature screen with adjustable screen holes, which adjusts the screen hole opening in real time according to the particle size distribution of the crushed material to avoid large pieces of slag clogging the screen and ensure screening accuracy.

[0101] Preferably, the screening device 600 may include a high-temperature screen, a first slag chute, and a second slag chute. The high-temperature screen is used to screen materials; the first slag chute (granulated slag chute) is connected to the high-temperature screen and is used to discharge the undersize material (granulated steel slag); the second slag chute (large slag chute) is connected to the high-temperature screen and is used to discharge the oversize material (large slag). The inside of the chute should be lined with refractory material (thickness not less than 50 mm) to withstand the thermal shock of the high-temperature material.

[0102] In this embodiment, the dust removal device 700 is the environmental protection mechanism of the system. It is connected to the treatment chamber 100. The dust removal device 700 extracts the dust-laden gas generated in the treatment chamber 100 through the exhaust system to prevent dust from overflowing.

[0103] The dust removal device 700 filters the dust-laden gas to remove dust particles and achieve emission standards. A slight negative pressure is created within the treatment chamber 100 to further suppress dust diffusion and improve the working environment for operators.

[0104] The dust removal device 700 can reduce dust accumulation on equipment surfaces, extend equipment lifespan, and reduce maintenance frequency.

[0105] Preferably, the dust removal device 700 can be a dry dust collector (such as a bag filter). Compared with wet dust removal systems, dry dust removal has advantages such as less equipment corrosion, lower maintenance costs, no wastewater discharge, and stable operation, making it particularly suitable for water-scarce areas or scenarios with strict environmental protection requirements.

[0106] Preferably, the dust removal device 700 may include an exhaust duct and a dry dust collector. The exhaust duct is a steel structure pipe, with one end connected to the treatment chamber 100 and the other end connected to the dry dust collector. The exhaust duct should have high temperature resistance and be able to withstand the high temperature of the dust-laden gas.

[0107] For example, the mixing zone 200, the slag dumping device 300, the stirring and crushing device 500, and the screening device 600 are all located inside the processing chamber 100. These components form a continuous flow layout from input to output in space.

[0108] The feeding device 400 is connected to the processing chamber 100, and the output end of the feeding device 400 extends into the processing chamber 100 to ensure that the solid cooling medium 410 can be accurately delivered into the mixing zone 200. The dust removal device 700 is connected to the processing chamber 100 through an exhaust duct. The interface of the exhaust duct is usually located at the top or side of the processing chamber 100 to facilitate the collection of rising dust-laden gas.

[0109] The top door of the processing chamber 100 is closed when the slag dumping device 300 is working, maintaining a sealed state.

[0110] The output end of the slag dumping device 300 is located above the mixing zone 200, ensuring that the molten steel slag 310 falls directly into the mixing zone 200 under the action of gravity. The output end of the feeding device 400 is also located above the mixing zone 200, so that the solid cooling medium 410 and the molten steel slag 310 fall synchronously.

[0111] The mixing and crushing device 500 is set in the mixing zone 200, and its working range covers the entire mixing zone 200, ensuring that all materials can be fully mixed and crushed.

[0112] The screening device 600 is located on one side of the mixing zone 200, with its feed end connected to the mixing zone 200, forming a process connection. After the mixing and crushing device 500 completes its processing, it directly pushes the material to the screening device 600.

[0113] The mixing and crushing device 500 is movably installed, and its movement path covers the areas where the mixing zone 200 and the screening device 600 are located. This design allows the mixing and crushing device 500 to first complete the mixing and crushing operation in the mixing zone 200, and then push the processed material to the screening device 600, achieving multiple uses in one machine.

[0114] The stroke length of the mixing and crushing device 500 should be greater than the distance between the mixing zone 200 and the screening device 600 to ensure that the material can be completely pushed into the feed end of the screening device 600.

[0115] The discharge end of the screening device 600 is connected to external conveying equipment (such as slag pots, slag receiving cars, etc.). A granulated steel slag collecting device is installed below the first slag chute (granulated slag chute), and a large slag pot and slag receiving car are installed below the second slag chute (large slag chute) to realize the diversion and output of materials.

[0116] The screening device 600 should be set at a sufficient height to ensure that granulated steel slag and large slag pieces can fall into the collection equipment below by gravity without the need for additional power.

[0117] While the slag dumping device 300 is dumping molten steel slag 310, the feeding device 400 simultaneously adds solid cooling medium 410. This linkage enables instantaneous mixing of the two materials, allowing the molten steel slag 310 to begin contacting the solid cooling medium 410 as it falls into the mixing zone 200, thus optimizing heat exchange efficiency.

[0118] The amount of material added by the feeding device 400 can be dynamically adjusted according to the dumping rate of the slag dumping device 300 and the characteristics of the molten steel slag 310 to ensure that the mixing ratio meets the process requirements.

[0119] The mixing and crushing device 500 covers the entire mixing zone 200, ensuring that all mixed materials are fully processed. The mixing and crushing device 500 reciprocates within the mixing zone 200, achieving comprehensive mixing.

[0120] The operating time, movement speed, and roller speed of the mixing and crushing device 500 can be dynamically adjusted according to the temperature, viscosity and other characteristics of the mixed material to meet the needs of different processing stages.

[0121] After the mixing and crushing device 500 completes the processing, the material is conveyed from the mixing zone 200 to the screening device 600 through the pushing action, forming a natural process connection without the need for additional conveying equipment.

[0122] The endpoint of the movement path of the mixing and crushing device 500 should be located at the feed end of the screening device 600 to ensure that the material can smoothly enter the screening device 600.

[0123] When the dust removal device 700 is running, a slight negative pressure is created in the processing chamber 100, guiding the dust-laden gas from the processing chamber 100 to the dust removal device 700. This linkage ensures that dust will not diffuse outward from the gaps in the processing chamber 100.

[0124] The air volume of the dust removal device 700 should be matched with the volume of the treatment chamber 100 and the amount of dust generated during the treatment process to ensure the dust removal effect.

[0125] Preferably, the slag dumping device 300, feeding device 400, mixing and crushing device 500, screening device 600, and dust removal device 700 operate collaboratively under the coordination of the control system, forming a complete processing flow from molten steel slag input to granulated steel slag output. The processes are seamlessly connected, requiring no manual intervention, thus achieving automated continuous production.

[0126] Furthermore, this application uses a solid cooling medium 410 (such as low-temperature steel slag) to directly mix with molten steel slag 310. By utilizing the high heat capacity of the solid cooling medium 410, the heat energy of the molten steel slag 310 is efficiently absorbed through physical heat conduction, and the residual heat is directly transferred to the solid cooling medium 410.

[0127] The difference in specific heat capacity between the solid cooling medium 410 and the molten steel slag 310 determines the direction and rate of heat transfer. When the two are mixed, heat flows from the high-temperature molten steel slag 310 to the low-temperature solid cooling medium 410 until temperature equilibrium is reached. Due to the high specific heat capacity of the solid cooling medium 410, it can absorb a large amount of heat energy while its temperature rises relatively slowly, thus efficiently capturing waste heat.

[0128] In traditional water-cooling processes, the heat energy of molten steel slag is absorbed and dissipated through the vaporization of water, but the generated steam carries a large amount of heat energy into the environment, which cannot be effectively recovered. This system retains the waste heat in the solid cooling medium 410, preventing heat loss.

[0129] The solid cooling medium 410, after absorbing waste heat, can reach a temperature of 600℃-1200℃, and can be directly used as a heat source for subsequent waste heat recovery processes (such as rotary waste heat utilization systems), realizing the recycling of thermal energy and significantly improving the waste heat recovery efficiency of molten steel slag.

[0130] The molten steel slag 310 and the solid cooling medium 410 are mixed in the mixing zone 200 by the stirring and crushing device 500, realizing the integrated treatment of cooling, solidification and crushing.

[0131] During the stirring process, the solid cooling medium 410 particles come into full contact with the molten steel slag 310, with a contact area far exceeding the effect of traditional water cooling processes, which can only cool the surface layer of the steel slag. At the same time, the stirring action continuously renews the material surface, accelerating heat transfer and resulting in a cooling speed far faster than traditional water cooling and air cooling processes.

[0132] During the mixing process, the solid cooling medium 410 particles rub, collide, and impact with the solidified steel slag, which is equivalent to introducing a crushing medium while cooling, thus enhancing the crushing effect. The mechanical structure of the mixing and crushing device 500 (such as rotating roller teeth) further applies shearing and impact forces, making the crushing more thorough.

[0133] The processing time for a single batch of molten steel slag can be controlled within 15-40 minutes, of which the mixing and crushing time is only 5-20 minutes, which significantly shortens the processing cycle and improves production efficiency.

[0134] This application integrates a screening device 600 directly on one side of the mixing zone 200 to achieve in-situ particle size separation and output of steel slag after crushing and granulation.

[0135] In traditional processes, cooled and solidified steel slag requires multiple mechanical crushing steps before being transported to a screening workshop for particle size classification. This application places the screening device 600 directly next to the mixing zone 200. After processing by the mixing and crushing device 500, the material is directly pushed into the screening device 600, eliminating the need for material transfer and reducing transfer equipment and manual operation. It eliminates the need for a separate screening workshop, conveyor belts, elevators, and other equipment, significantly reducing equipment procurement costs. The integrated design results in a compact equipment layout, reducing the system's footprint and lowering civil engineering investment. Using a solid cooling medium instead of water eliminates the need for complex water treatment systems (such as water supply, drainage, and wastewater treatment), further reducing investment in auxiliary facilities.

[0136] By setting up a treatment chamber 100 covering the mixing area 200, a slag dumping device 300, a mixing and crushing device 500, and a screening device 600, a closed treatment environment is formed, effectively controlling dust overflow and heat radiation dissipation.

[0137] From hoisting in molten steel slag, dumping, mixing, stirring, crushing to screening and output, the entire process is completed inside the processing chamber 100. The top door is only briefly opened when hoisting in and out of the liquid slag tank, and remains closed at other times to minimize dust spillage.

[0138] The dust removal device 700 is connected to the treatment chamber 100, creating a slight negative pressure state within the treatment chamber 100 to guide the dust-laden gas into the dust removal device 700 for purification. The dust-laden gas is then filtered by a dry dust collector (such as a bag filter) and discharged in compliance with standards.

[0139] Advantages of dry dust removal: Compared with wet dust removal systems, dry dust removal has the following advantages: no wastewater discharge, avoiding secondary pollution; less equipment corrosion, low maintenance costs; stable operation and high dust removal efficiency; suitable for water-scarce areas.

[0140] Improved working environment: The enclosed design and effective dust removal significantly improve the working environment for operators, reducing the health hazards of high-temperature radiation and dust to workers.

[0141] By using solid cooling medium 410 instead of water as the cooling medium, large amounts of water resources are not required. Water costs are high for steel companies, especially in water-scarce regions, making this advantage even more significant.

[0142] The main energy consumption of this application comes from the drive motor of the mixing and crushing device 500 and the fan of the dust removal device 700. No additional energy media such as water and steam are required, and the power consumption is significantly lower than that of traditional processes.

[0143] Solid cooling medium 410 is itself a byproduct of steel slag processing, with abundant supply and low cost. Low-temperature steel slag can be recycled as a cooling medium, further reducing operating costs.

[0144] Dry dust removal systems avoid the corrosion problems of wet dust removal and extend equipment maintenance cycles; the roller teeth of the 500 mixing and crushing device are made of high-temperature resistant and wear-resistant alloy steel, resulting in a long service life; the overall equipment has a low failure rate and significantly reduces maintenance costs.

[0145] Through thorough crushing by the mixing and crushing device 500 and precise grading by the screening device 600, the granulated steel slag obtained has a uniform particle size, with a mass ratio of particles not exceeding 50mm not less than 80%, which meets the requirements of subsequent waste heat recovery processes for raw material particle size.

[0146] By adjusting the amount and proportion of solid cooling medium 410 added, the output temperature of granulated steel slag (600℃-1200℃) can be controlled to meet the temperature requirements of different waste heat recovery processes.

[0147] This application allows for dynamic adjustment of process parameters (such as cooling medium ratio, stirring time, screening accuracy, etc.) based on the temperature, viscosity, and other characteristics of molten steel slag 310, to meet the processing needs of different batches and sources of molten steel slag.

[0148] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 The mixing zone 200 includes a base plate 210 and a cushion layer 220. The base plate 210 is laid on the bottom wall of the processing chamber 100, and the cushion layer 220 is laid on the base plate 210.

[0149] In this embodiment, the base plate 210 is the structural support layer of the mixing zone 200, located below the pad layer 220, and connected to the bottom frame of the processing chamber 100.

[0150] The base plate 210 bears the weight of all materials above the mixing zone 200 (molten steel slag, solid cooling medium, the self-weight of the mixing and crushing device, and impact loads), and transfers the load to the foundation structure of the processing chamber 100. The base plate 210 must have sufficient rigidity and strength to prevent deformation.

[0151] The base plate 210 provides an installation reference for the traveling track or guide structure of the mixing and crushing device 500, ensuring that the mixing and crushing device 500 can move smoothly above the mixing zone 200.

[0152] Under the thermal insulation effect of the padding layer 220, the temperature of the base plate 210 is significantly reduced, which reduces thermal expansion and thermal stress and protects the base plate 210 from high temperature damage.

[0153] The bottom plate 210 can prevent molten steel slag from directly contacting the bottom structure of the treatment chamber 100, thus avoiding high-temperature ablation and chemical corrosion.

[0154] The base plate 210 has a flat surface and can be used as a work platform when replacing the pad 220 or cleaning up residual materials.

[0155] Preferably, the base plate 210 is made of steel structure lining plate with a steel plate thickness of not less than 30mm to ensure sufficient structural strength; the surface of the base plate 210 can be treated with rust prevention or sprayed with high temperature resistant coating to extend service life; the base plate 210 and the frame of the treatment chamber 100 can be bolted together for easy disassembly and replacement.

[0156] The cushion layer 220 is the functional working layer of the mixing zone 200. It is laid on the bottom plate 210 and is in direct contact with the molten steel slag 310 and the solid cooling medium 410.

[0157] The cushion layer 220 directly bears the impact and heat radiation of the molten steel slag 310 (temperature 1200℃-1700℃) from the slag dumping device 300, protecting the bottom plate 210 from high temperature damage.

[0158] The pad 220 has a large thickness (not less than 200 mm) and low thermal conductivity, which can effectively block heat transfer to the base plate 210, allowing the base plate 210 to work in a relatively low temperature environment and reducing thermal stress fatigue.

[0159] The cushion layer 220 is made of solid steel slag particles, which are similar in material to molten steel slag 310 and have good chemical compatibility, making it less prone to adhesion. The granular structure of the cushion layer 220 increases the contact area of ​​the materials, promotes heat exchange, and reduces the accumulation and agglomeration of molten steel slag at the bottom.

[0160] The particles of the cushion layer 220 will move together with the mixed materials under the agitation of the mixing and crushing device 500, which plays a role in assisting mixing and dispersing, increasing the contact opportunity between the solid cooling medium 410 and the molten steel slag 310, and improving the mixing uniformity.

[0161] When the mixing and crushing device 500 is in operation, the pad 220 can buffer the impact between the roller teeth and the bottom plate 210, preventing the roller teeth from directly hitting the bottom plate 210 and causing damage.

[0162] The pad 220 may be worn out during use due to wear, clumping, or discharge with materials. However, it can be repaired by adding new solid cooling medium (of the same material) in subsequent processing through the feeding device 400, without the need to stop the machine for replacement, thus achieving continuous production.

[0163] The 220 base layer is made of solid steel slag particles. This material is a by-product of the steel production process, with abundant supply and extremely low cost. It can be replaced or replenished regularly, making it economical.

[0164] Preferably, the thickness of the cushion layer 220 is not less than 200 mm to ensure sufficient heat insulation and buffering capacity and service life; the particle size range of the cushion layer 220 can be the same as or slightly coarser than that of the solid cooling medium 410, generally not exceeding 150 mm; the material of the cushion layer 220 can be the same low-temperature steel slag particles as that of the solid cooling medium 410 to maintain material consistency.

[0165] For example, the base plate 210 is fixedly installed on the bottom frame of the processing chamber 100. The connection method can be welding or high-strength bolts. Welding provides high connection strength and good sealing, and is suitable for permanent installation; bolted connections facilitate disassembly and replacement, and are suitable for occasions requiring periodic maintenance.

[0166] The upper surface of the base plate 210 is in direct contact with the lower surface of the pad 220, and the two are in a planar fit relationship, requiring no additional fixing. The pad 220 is held on the base plate 210 by its own weight and the pressure of the material above it.

[0167] Appropriate gaps or sealing structures should be provided between the perimeter of the base plate 210 and the side walls of the processing chamber 100 to accommodate thermal expansion and prevent material from seeping under the base plate.

[0168] The upper surface of the cushion layer 220 is in direct contact with the molten steel slag 310 and the solid cooling medium 410. Under the action of the mixing and crushing device 500, some of the particles of the cushion layer 220 will mix with the mixed materials to form a dynamic material exchange.

[0169] The cushion layer 220 is constrained by the side walls or baffle structure of the processing chamber 100 to prevent the cushion layer 220 from spreading outwards and to maintain a certain stacking shape.

[0170] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 The slag dumping device 300 includes a slag storage tank 320 and a slag dumping machine 330. The slag storage tank 320 is connected to the slag dumping machine 330. The output end of the slag dumping machine 330 is located above the mixing zone 200. Molten steel slag 310 is dumped onto the cushion layer 220 by the slag dumping machine 330.

[0171] In this embodiment, the slag storage tank 320 is a container for holding and transporting molten steel slag 310, and it undertakes the function of material transfer between the steelmaking process and the steel slag treatment process.

[0172] The slag storage tank 320 receives high-temperature liquid steel slag (temperature 1200℃-1700℃) at the slag outlet of the steelmaking furnace and serves as a temporary storage container. The volume of the slag storage tank 320 must match the slag output of the steelmaking furnace, and is usually not less than 5m³.

[0173] During transportation, the slag storage tank 320 maintains the molten steel slag 310 at a high temperature to prevent premature solidification. The tank body is usually equipped with an insulation layer or made of heat-resistant materials to reduce heat loss.

[0174] After the slag storage tank 320 is hoisted onto the slag dumping machine 330, the molten steel slag 310 inside the tank is poured out by the tilting action of the slag dumping machine 330. The slag storage tank 320 is equipped with lifting lugs, tilting supports and other structures to facilitate hoisting and connection with the slag dumping machine 330.

[0175] After the slag is emptied, the empty slag storage tank 320 is lifted off the ground and transported back to the steelmaking process. After inspection and cleaning, it is reused, achieving a cycle of turnover and reducing equipment investment.

[0176] The slag storage tank 320 has sufficient wall thickness (not less than 50mm) and strength to withstand the thermal stress of high-temperature molten steel slag and mechanical impact during transportation, preventing safety accidents such as cracking and leakage.

[0177] Preferably, the slag storage tank 320 is made of steel with a wall thickness of not less than 50 mm and a volume of not less than 5 m³; the tank body can be reinforced to improve structural strength; the tank opening is designed in a shape that facilitates pouring (such as a flared opening or an eccentric opening) to reduce splashing when pouring slag; the exterior of the tank body can be coated with a high-temperature resistant coating or have an insulation layer installed.

[0178] The slag dumping machine 330 is a tilting actuator, which is fixedly installed in the processing chamber 100 and is used to dump the molten steel slag 310 in the slag storage tank 320 into the mixing zone 200.

[0179] The slag dumping machine 330 is equipped with a receiving platform or support for the slag storage tank 320, which can accurately position and lock the slag storage tank 320 to ensure that the tank is stable and does not shake during the slag dumping process.

[0180] The slag dumping machine 330 uses a hydraulic, pneumatic or electric drive mechanism to rotate the slag storage tank 320 around the tilting axis by a certain angle (usually up to 180 degrees), so that the molten steel slag 310 inside the tank flows out under the action of gravity.

[0181] The slag dumper 330 can control the dumping speed and final angle to achieve uniform dumping of molten steel slag 310. The controllable dumping rate (e.g., dumping completed in 1-5 minutes) helps to match the feeding rate of the feeding device 400, ensuring uniform mixing.

[0182] The main mechanical structure of the slag dumping machine 330 is located inside the processing chamber 100, while its drive power mechanism can be located outside the processing chamber 100 (transmitting power through shaft seals or partitions) to adapt to high temperature and high dust environments and facilitate maintenance.

[0183] The slag dumping machine 330 is equipped with safety interlock control with the top door of the processing chamber 100 and the dust removal device 700. The slag dumping machine 330 can only be started when the top door is closed and the dust removal device 700 is operating normally, ensuring operational safety.

[0184] After the slag is dumped, the slag dumping machine 330 returns the slag storage tank 320 to a horizontal position for easy removal.

[0185] Preferably, the slag dumper 330 is a fixed tilting slag dumper, with the main structure made of steel; the tilting drive can be a hydraulic cylinder or an electric push rod, with a self-locking function; the tilting angle is adjustable from 0 to 180 degrees, and the tilting speed is adjustable; the load-bearing capacity of the slag dumper 330 should be greater than the total weight of the slag storage tank 320 when fully loaded (including molten steel slag).

[0186] For example, the slag storage tank 320 and the slag dumping machine 330 are detachably connected. The slag storage tank 320 is placed on the receiving platform of the slag dumping machine 330 and is kept stable by positioning pins, claws or its own weight, and is fixed by a locking mechanism when dumping.

[0187] The slag dumping machine 330 is equipped with a tilting support. The tilting shaft of the slag storage tank 320 cooperates with the support to form a rotating pair, thereby realizing the tilting action.

[0188] The drive mechanism of the slag dumper 330 is connected to the tilting frame of the slag storage tank 320 through a connecting rod, gear or direct connection, and transmits power to the slag storage tank 320.

[0189] The output end of the slag dumper 330 (i.e., the position of the slag storage tank 320 when it is tilted) is set above the mixing zone 200 to ensure that the molten steel slag 310 falls into the cushion layer 220 by gravity.

[0190] The installation height of the slag dumping machine 330 should ensure that the lowest point of the slag storage tank 320 is at an appropriate height (usually 0.5m-1.5m) from the upper surface of the pad layer 220 when the slag storage tank 320 is at its maximum tilting angle, so as to ensure that the material falls smoothly and reduce splashing.

[0191] Before the slag dumping machine 330 is started, the top door 120 is closed to ensure that the slag dumping process is carried out in a closed environment. The slag dumping machine 330 cannot start when the top door 120 is open.

[0192] When the slag dumping machine 330 starts, the dust removal device 700 is in operation to ensure that the dust-laden gas generated during slag dumping is collected in a timely manner.

[0193] The slag dumping process in this embodiment is as follows: top door 120 opens → slag storage tank 320 is hoisted in → top door 120 closes → dust removal device 700 is started → slag dumping machine 330 is started → dumping is completed → slag dumping machine 330 is reset → top door 120 opens → empty tank is hoisted out → top door 120 closes.

[0194] While the slag dumper 330 dumps the molten steel slag 310, the feeding device 400 simultaneously adds solid cooling medium 410, so that the mixed materials are dropped at the same time, thus optimizing the heat exchange effect.

[0195] The dumping rate of the slag dumper 330 and the feeding rate of the feeding device 400 are coordinated by the control system so that the molten steel slag 310 and the solid cooling medium 410 are mixed in a preset ratio during the material discharge process.

[0196] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 The feeding device 400 includes a conveyor 420, a cold slag hopper 430, and a discharge valve 440. The output end of the conveyor 420 is connected to the opening of the cold slag hopper 430. The conveyor 420 transports the solid cooling medium 410 into the cold slag hopper 430. The cold slag hopper 430 is located above the mixing zone 200. The discharge valve 440 is installed at the discharge port at the bottom of the cold slag hopper 430.

[0197] In this embodiment, the conveyor 420 is the material lifting and conveying mechanism of the feeding device 400, which is responsible for conveying the solid cooling medium 410 from the ground storage area or silo to the high-level cold slag hopper 430.

[0198] The cold slag hopper 430 is located above the mixing zone 200 (usually several meters above the ground). The conveyor 420 overcomes the height difference and lifts the solid cooling medium 410 from a low position to a high position to ensure the material level in the cold slag hopper 430.

[0199] The conveyor 420 can operate continuously, continuously replenishing the cold slag hopper 430 with solid cooling medium 410, so that the cold slag hopper 430 always maintains a certain material level to meet the needs of multi-batch, continuous production.

[0200] The conveying speed of the conveyor 420 is adjustable (via a variable frequency motor or speed control mechanism), and the amount of material fed into the cold slag hopper 430 can be adjusted according to process requirements to match the discharge rate of the discharge valve 440, thus preventing the cold slag hopper 430 from overflowing or becoming empty.

[0201] The solid cooling medium 410 is granular steel slag, with a particle size typically not exceeding 150mm, and possesses a certain degree of abrasiveness. The conveyor 420 must have wear-resistant and impact-resistant characteristics to meet the conveying requirements of granular materials.

[0202] The conveyor 420 can adopt a closed structure (such as a closed corridor or tubular conveyor) to prevent dust from spilling out during the conveying process and to keep the workshop environment clean.

[0203] Preferably, the conveyor 420 can be a belt conveyor, which has a simple structure, large conveying capacity, and convenient maintenance, and is suitable for long-distance and high-height conveying of granular materials; if the installation space is limited or a large-angle conveying is required, a bucket elevator or a large-angle belt conveyor can be used; the conveyor belt or chain of the conveyor 420 should be made of wear-resistant material, and the chute and guide chute should be equipped with wear-resistant liners; the drive motor of the conveyor 420 should preferably be frequency converter controlled to facilitate adjustment of the conveying speed.

[0204] The cold slag hopper 430 is an intermediate buffer storage bin of the feeding device 400, located above the mixing zone 200, and is used to temporarily store the solid cooling medium 410 conveyed by the conveyor 420.

[0205] The cold slag hopper 430 has a certain volume (usually not less than 3m³) and can store a sufficient amount of solid cooling medium 410 to ensure that the system can continue to supply material during short shutdowns or maintenance of the conveyor 420, thereby improving the continuity of production.

[0206] The bottom of the cold slag hopper 430 is equipped with a discharge port. Utilizing the weight of the solid cooling medium 410, it automatically flows out when the discharge valve 440 is opened, requiring no additional power, making it energy-saving and reliable.

[0207] The material stored in the cold slag hopper 430 forms a certain pressure column, making the material flow at the discharge port more uniform and stable, and reducing the change in discharge volume caused by the fluctuation of the material supply from the conveyor 420.

[0208] Conveyors 420 (especially bucket elevators) may experience pulsating or intermittent feeding during the conveying process. The buffering function of the cold slag bucket 430 can smooth out such fluctuations, making the feeding of the discharge valve 440 more continuous and stable.

[0209] The volume of the cold slag hopper 430 should meet the amount of solid cooling medium required for processing molten steel slag in a single or multiple tanks, in order to avoid material shortages during batch processing.

[0210] If the solid cooling medium 410 needs to be kept at a low temperature (to improve cooling efficiency), the cold slag hopper 430 can be equipped with an insulation layer to prevent the medium from absorbing heat from the environment and rising in temperature.

[0211] Preferably, the cold slag hopper 430 is a steel structure hopper with a volume of not less than 3m³; the shape of the hopper body should preferably be a pyramid or cone with a larger top and a smaller bottom, and the inclination angle of the hopper wall should be greater than the angle of repose of the material (usually ≥60°) to ensure smooth material flow without accumulation or blockage; the inner wall of the hopper can be lined with wear-resistant plates or coated with a smooth coating to reduce material friction and adhesion; the top of the cold slag hopper 430 is provided with a feed inlet that connects to the output end of the conveyor 420; the bottom is provided with a discharge port that connects to the discharge valve 440; a level gauge (such as a radar level gauge or a rotary paddle level switch) can be installed to monitor the material level in the hopper in real time and automatically control the start and stop of the conveyor 420.

[0212] The discharge valve 440 is a quantitative control actuator of the feeding device 400. It is installed at the discharge port at the bottom of the cold slag hopper 430 and is used to control the outflow volume and outflow rate of the solid cooling medium 410.

[0213] When the discharge valve 440 is open, the solid cooling medium 410 flows out from the cold slag hopper 430; when it is closed, feeding stops. The intermittent feeding is controlled by opening and closing the valve.

[0214] By adjusting the opening degree of the discharge valve 440 (for gate valves, butterfly valves, etc.) or changing the opening and closing frequency (for rotary feeders, vibrating feeders, etc.), the feeding rate of the solid cooling medium 410 can be precisely controlled to meet different process ratio requirements.

[0215] The discharge valve 440 is linked with the slag dumping device 300. At the same time as the slag dumping machine 330 dumps the molten steel slag 310, the discharge valve 440 opens, allowing the solid cooling medium 410 to fall into the mixing zone 200 simultaneously, achieving instant mixing.

[0216] The feeding rate of the discharge valve 440 and the tilting rate of the slag dumper 330 are coordinated to ensure that the amount of solid cooling medium 410 added is always kept within the preset ratio range of the mass of molten steel slag 310 (such as 0%-30%), thus ensuring the consistency of the cooling effect.

[0217] The cold slag hopper 430 is located above the mixing zone 200. Although it does not directly contact the molten steel slag, it is affected by the rising hot airflow and thermal radiation, and the temperature can reach above 200℃. The discharge valve 440 must have high temperature resistance, and its long-term high temperature operating temperature should not be lower than 200℃ to ensure reliable valve operation and good sealing.

[0218] The solid cooling medium 410 is a granular material and may contain a small amount of large or irregularly shaped particles. The discharge valve 440 should be designed to prevent clogging or have a self-cleaning function.

[0219] Preferably, the discharge valve 440 can be an electro-hydraulic gate valve, a pneumatic butterfly valve, a rotary feeder (star feeder), or a vibrating feeder, etc. For granular materials, the rotary feeder has the advantages of uniform feeding, quantitative feeding, and good sealing, making it suitable for precise control. The valve material should be wear-resistant steel (such as Mn13, wear-resistant alloy), and the sealing surface can be overlaid with hard alloy. The drive method can be electric, pneumatic, or hydraulic, selected according to the control accuracy and response speed requirements. An opening feedback device (such as a potentiometer, encoder) or flow meter can be configured to achieve closed-loop control.

[0220] For example, the output end (head discharge port) of the conveyor 420 is located directly above the opening of the cold slag hopper 430, and the two can be connected by a flexible connection (such as a canvas sleeve) or a sealing flange to prevent material splashing and dust overflow.

[0221] The head height of the conveyor 420 should be higher than the opening of the cold slag hopper 430 to ensure that the material falls into the cold slag hopper 430 by gravity.

[0222] A discharge chute or guide plate can be installed at the head of the conveyor 420 to guide the material to fall accurately into the cold slag hopper 430, avoiding deviation and splashing. Sealing devices (such as rubber sealing strips or labyrinth seals) should be installed at the joints to prevent dust from leaking out from the seams.

[0223] The cold slag hopper 430 is positioned above the mixing zone 200 and is typically fixed to the top or side wall of the processing chamber 100 by a bracket. The bottom discharge port is located directly above the mixing zone 200.

[0224] The hopper body of the cold slag hopper 430 can be partially embedded in the top of the treatment chamber 100, or connected to the mounting holes on the top of the treatment chamber 100 via a flange. The connection should be sealed to prevent dust from spilling out.

[0225] The bottom discharge port of the cold slag hopper 430 should be at an appropriate height (usually 0.5m-1.5m) from the upper surface of the pad layer 220, so that the solid cooling medium 410 has a certain kinetic energy after falling, which can fully mix with the molten steel slag 310, while reducing splashing.

[0226] The inlet of the discharge valve 440 is directly connected to the discharge port at the bottom of the cold slag hopper 430 via a flange or thread, with no gap in between to prevent material leakage. A sealing gasket (high-temperature resistant asbestos gasket, metal spiral wound gasket, etc.) should be installed at the connection to ensure airtightness under high-temperature conditions and prevent dust from overflowing.

[0227] The discharge valve 440 is usually fixed to the bottom flange of the cold slag hopper 430 by bolts. The weight of the discharge valve 440 is borne by the hopper body of the cold slag hopper 430, and it is necessary to ensure that the structural strength of the cold slag hopper 430 is sufficient.

[0228] The discharge port of the discharge valve 440 (i.e., the location where the solid cooling medium 410 flows out) is located directly above the mixing zone 200, adjacent to or coaxially arranged with the output end of the slag dumping device 300, so that the solid cooling medium 410 and the molten steel slag 310 fall into the same area, which facilitates mixing.

[0229] Preferably, the discharge port of the unloading valve 440 and the output end (slag tank opening) of the slag dumping device 300 coincide or are closely adjacent in the horizontal projection, so that the two materials begin to mix during the discharge process.

[0230] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 The mixing and crushing device 500 includes a rotating roller tooth structure, which is movably installed in the processing chamber 100. The movement path of the rotating roller tooth structure covers the mixing zone 200 and the area where the screening device 600 is located.

[0231] In this embodiment, the rotating roller tooth structure is the core working component of the mixing and crushing device 500, which directly contacts the mixed materials to complete mechanical actions such as mixing and crushing.

[0232] During rotation, the rotating roller teeth generate relative motion with the material, thoroughly agitating, dispersing, and mixing the molten steel slag and solid cooling medium within the mixing zone 200, ensuring uniform contact between the two. The stirring action continuously refreshes the heat exchange interface of the materials, accelerating the transfer of heat from the molten steel slag to the solid cooling medium and promoting rapid cooling and solidification.

[0233] The tips and grooves of the roller teeth exert shearing forces on the material as they rotate. When the material is caught between the roller teeth or between the roller teeth and the padding layer, it is subjected to intense shearing, tearing and breaking large pieces of steel slag. Shear crushing is particularly effective for steel slag with a certain degree of toughness.

[0234] The high-speed motion (or low-speed, high-torque motion) of the rotating roller teeth generates an impact load on the material, causing large pieces of steel slag to disintegrate under the impact. The linear velocity of the roller teeth and the impact frequency can be adjusted according to the hardness of the material.

[0235] An extrusion zone is formed between multiple sets of roller teeth or between the roller teeth and the sidewall of the mixing zone. The material is subjected to high pressure as it passes through, and the brittle steel slag is crushed. The extrusion crushing produces less powdery material and has better particle size uniformity.

[0236] The rotating roller teeth cause relative friction and grinding between the solid cooling medium particles and the steel slag, resulting in surface peeling and rounding of edges, which helps to refine the particles and improve their shape.

[0237] The rotating roller teeth generate normal mixing and crushing effects on the one hand, and axial (or tangential) thrust through the inclined arrangement or movement direction of the roller teeth on the other hand, pushing the material from the mixing zone 200 to the screening device 600, thereby realizing material conveying.

[0238] The continuous rotational stirring action disrupts the agglomeration tendency of molten steel slag during the cooling process, preventing the formation of large, difficult-to-crush slag pieces and reducing the difficulty of crushing.

[0239] The mixing and crushing device 500 is movably installed within the processing chamber 100 to ensure that all poured-in molten steel slag and solid cooling medium are fully mixed and crushed, eliminating any dead zones. Fixed mixers cannot achieve large-area coverage.

[0240] The material moves and stirs simultaneously, constantly agitating and displacing the mixture to prevent localized overheating or uneven mixing. The moving speed is matched with the stirring speed to create a dynamic stirring effect.

[0241] The mixing and crushing device 500 can be selected to remain stationary or move depending on the processing stage. In the initial stage of mixing, it can remain stationary in the area where the material is most concentrated for vigorous mixing; in the later stage of crushing, it can move slowly to ensure uniform crushing of the material.

[0242] When the mixing and crushing device 500 moves from the mixing zone 200 towards the screening device 600, the thrust generated by its rotating rollers gradually pushes the material to the feed end of the screening device 600, achieving mixing instead of conveying, eliminating the need for a separate conveyor. The movable design allows the mixing and crushing device 500 to adapt to the distribution of different batches of material. For unevenly piled materials, it can be actively moved to the pile location for processing.

[0243] The mixing and crushing device 500 can be moved to the vicinity of the maintenance door for easy daily inspection, roller tooth replacement and cleaning of adhering materials, without requiring personnel to enter the depths of the mixing area.

[0244] For example, a travel track is laid inside the processing chamber 100, and the traveling wheels of the mixing and crushing device 500 roll on the track, driven by a motor. Smooth movement is achieved through chain or rack transmission, with high positioning accuracy.

[0245] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 The screening device 600 includes a high-temperature screen 610, a first slag chute 620, and a second slag chute 630. The high-temperature screen 610 is used to screen the crushed and granulated steel slag into undersize material 640 and oversize material 650. The first slag chute 620 is connected to the high-temperature screen 610 and is used to discharge the undersize material 640. The second slag chute 630 is connected to the high-temperature screen 610 and is used to discharge the oversize material 650. The second slag chute 630 is connected to the slag receiving car 660.

[0246] In this embodiment, the high-temperature screen 610 is the core grading component of the screening device 600, which is used to separate the crushed and granulated steel slag into undersize material 640 (granulated steel slag) and oversize material 650 (large slag pieces) according to particle size.

[0247] The high-temperature screen 610 has regularly arranged screen holes (usually square or round) on its screen surface. When the crushed and granulated steel slag is pushed onto the screen surface by the mixing and crushing device 500, particles smaller than the screen holes (undersize material 640) pass through the screen holes and fall down; particles larger than the screen holes (oversize material 650) continue to move forward along the screen surface and eventually slide out of the screen surface.

[0248] The steel slag processed by the screening device 600 reaches temperatures as high as 600℃-1200℃. Ordinary screens would quickly soften, deform, or burn at such high temperatures. The high-temperature screen 610 is made of high-temperature resistant materials (such as heat-resistant steel, stainless steel 310S, Inconel, etc.) and can withstand high operating temperatures of not less than 1100℃, maintaining structural strength and dimensional stability.

[0249] The steel slag after crushing and granulation has sharp edges and a large mass, which causes severe impact and wear on the screen surface. The surface of the screen bars or screen plates of the high-temperature screen 610 can be treated with wear-resistant materials (such as hard alloy overlay welding, carburizing and quenching) to extend its service life.

[0250] The high-temperature screen 610 features optimized screen aperture shape, opening ratio, and screen surface inclination angle to ensure sufficient residence time and movement speed of materials on the screen surface, achieving efficient screening. The screen surface inclination angle is typically 15°-30°, allowing materials to slide down automatically under gravity while preventing material accumulation.

[0251] Steel slag may contain small amounts of sticky substances or irregularly shaped particles, which can easily clog the screen holes. The high-temperature screen 610 can use self-cleaning screens (such as spring wire screens or tension screens) or be equipped with knocking or vibrating devices to prevent screen hole clogging and maintain screening permeability.

[0252] The high-temperature screen 610 can be designed with a modular structure, consisting of multiple screen plates spliced ​​together, which facilitates partial replacement and maintenance, reducing maintenance costs.

[0253] The first slag chute 620 is the outlet channel for under-screened material. It is connected to the high-temperature screen 610 and is used to receive and transport under-screened material 640 (granulated steel slag).

[0254] The first slag chute 620 is located below the high-temperature screen 610, with its inlet facing the discharge area of ​​the undersize material 640, ensuring that all granulated steel slag passing through the screen holes can fall into the chute and avoid scattering and waste.

[0255] The first slag chute 620 has a certain inclination angle (usually ≥45°), which allows the granulated steel slag to slide down automatically under the action of gravity, without the need for power transportation, saving energy and having a simple structure.

[0256] The first slag chute 620 collects the dispersed undersize material 640 and guides it to a designated outlet (such as subsequent waste heat recovery equipment, granulated steel slag collection tank or conveyor belt), realizing centralized output of materials.

[0257] Granulated steel slag still reaches temperatures as high as 600℃-1200℃ and is abrasive. The first slag chute 620 is made of steel structure, with refractory materials (such as castables and wear-resistant ceramic liners) installed on the inner wall, with a thickness of not less than 50mm, to withstand high temperatures and wear.

[0258] The cross-sectional shape and inclination angle of the first slag chute 620 should be designed to ensure smooth material flow and prevent material accumulation. If necessary, observation windows and chute holes can be installed to facilitate the cleaning of blockages.

[0259] The first slag chute 620 should be a closed structure with a top cover and sealed joints to prevent dust from overflowing during the descent of granulated steel slag. An air intake can be installed to connect to the dust removal device 700.

[0260] The second slag chute 630 is the discharge channel for the material on the screen. It is connected to the high-temperature screen 610 and is used to receive and transport the material on the screen 650 (large slag pieces).

[0261] The second slag chute 630 is located at the discharge end of the high-temperature screen 610 (the discharge position of the material on the screen), and its inlet is directly facing the large pieces of slag sliding down the screen surface, ensuring that all the material on the screen can fall into the chute.

[0262] Similar to the first slag chute 620, the second slag chute 630 uses gravity to transport large slag pieces downwards without the need for power.

[0263] The outlet of the second slag chute 630 is connected to the slag receiving car 660, and large pieces of slag fall directly into the slag receiving car 660 for automatic collection without the need for manual shoveling.

[0264] Large slag pieces can reach over 200mm in size, have a large mass, and exert a strong impact on the chute. The bottom and side plates of the second slag chute 630 should have sufficient strength, be lined with wear-resistant materials, and have buffer plates or steps at the material drop point to reduce impact damage.

[0265] The outlet size of the chute should be large enough to prevent large pieces of slag from clogging it. A quick-opening inspection door can be installed for easy handling of blockages.

[0266] The second slag chute 630 also needs to be sealed to prevent dust from overflowing, and can be connected to the dust removal device 700.

[0267] The slag receiving car 660 is a mobile collection and transfer device for large slag pieces. It is connected to the outlet of the second slag chute 630 and is used to receive and transport the over-screen material 650 (large slag pieces).

[0268] The slag receiving car 660 is placed directly below the outlet of the second slag chute 630 (or connected via a guide pipe). Large pieces of slag fall directly into the hopper from the chute outlet, eliminating the need for manual loading.

[0269] The slag receiving truck 660 has sufficient volume (usually no less than 5m³) to collect large slag produced in single or multiple batches of processing, reducing the frequency of transfer.

[0270] The 660 slag receiving truck is a mobile device (rail-mounted or wheeled). Once full, it can be towed or driven away by a tractor to a designated storage yard or returned to the system for further processing, enabling flexible transfer of large slag pieces.

[0271] A flexible connection (such as a canvas cover) or a guide chute can be installed between the slag receiving car 660 and the outlet of the second slag chute 630 to prevent dust from flying when large pieces of slag fall. The receiving port of the slag receiving car 660 should be equipped with a sealing cover that can be closed during transportation.

[0272] The 660 muck truck can be equipped with a weighing sensor to monitor the loading amount in real time and trigger an alarm to prompt replacement when the set weight is reached. A positioning device is installed below the chute outlet to ensure accurate positioning of the 660 muck truck.

[0273] The 660 dump truck can be designed as a self-unloading type (such as a hydraulic lifting tipper), which can automatically unload materials after arriving at the stockpile, improving operational efficiency.

[0274] For example, the feed end of the high-temperature screen 610 is adjacent to the mixing zone 200 and located at the end of the movement path of the mixing and crushing device 500. The mixing and crushing device 500 directly pushes the crushed material onto the screen surface of the high-temperature screen 610, achieving seamless connection.

[0275] The height of the screen surface of the high-temperature screen 610 should be slightly lower than the upper surface of the pad 220 of the mixing zone 200, or a transition plate should be set to ensure a smooth transition of materials and avoid accumulation or spillage.

[0276] The screen surface inclination angle of the high-temperature screen 610 is coordinated with the pushing direction of the mixing and crushing device 500 to ensure that the material can smoothly enter the screen surface and slide down.

[0277] The support frame of the high-temperature screen 610 is fixedly connected to the bottom or side wall of the processing chamber 100 by welding or bolting to ensure stability and prevent shaking during the screening process.

[0278] To facilitate maintenance and replacement of the screen plate, the high-temperature screen 610 can be bolted to the support, and the screen plate can be disassembled and installed separately.

[0279] A seal (such as asbestos rope or heat-resistant rubber) should be installed between the high-temperature screen 610 and the wall panel of the treatment chamber 100 to prevent dust from leaking out from the gaps.

[0280] The feed inlet of the first slag chute 620 and the discharge outlet below the high-temperature screen 610 (the area where the under-screened material falls) are connected by flanges or welding to ensure that all the under-screened material enters the chute. A guide plate or a closing hopper can be installed at the connection to prevent material splashing.

[0281] The discharge port of the first slag chute 620 is connected to the subsequent equipment (such as the granulated steel slag conveyor belt and the feed hopper of the waste heat recovery device), and the connection is also sealed to prevent dust from overflowing.

[0282] The middle part of the first slag chute 620 can be fixed to the side wall or top of the treatment chamber 100 by means of a hanger or bracket to ensure the stability of the chute and the accuracy of its inclination angle.

[0283] The feed inlet of the second slag chute 630 is connected to the discharge end (the material discharge outlet of the screen) of the high-temperature screen 610 by flange or welding. A closing plate can be set to guide large pieces of slag into the chute.

[0284] The discharge port of the second slag chute 630 is located directly above the receiving port of the slag receiving car 660, with an appropriate gap (50-100mm) between them to facilitate the entry and exit of the slag receiving car 660. At the same time, a dustproof soft curtain or guide cylinder is installed to reduce dust overflow.

[0285] Limit blocks or induction switches are installed at the stopping position of the slag receiving car 660 to ensure that the receiving port of the slag receiving car 660 is accurately aligned with the outlet of the second slag chute 630.

[0286] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 The dust removal device 700 includes an exhaust pipe 710, one end of which is connected to the processing chamber 100 and the other end is connected to the dust collector.

[0287] In this embodiment, the exhaust duct 710 is the gas delivery channel of the dust removal device 700. One end is connected to the processing chamber 100, and the other end is connected to the dust collector, which is responsible for guiding the dust-laden gas from the processing chamber 100 to the dust collector.

[0288] The exhaust duct 710 serves as an air duct, transporting dust-laden gas (containing steel slag dust, hot air, etc.) from the source within the treatment chamber 100 to the dust collector for purification. The duct's inner diameter and length are designed based on air volume and pressure to ensure smooth gas flow and minimal pressure loss.

[0289] When the dust collector's exhaust fan is running, it establishes a negative pressure environment in the treatment chamber 100 through the exhaust duct 710. The magnitude and uniformity of the negative pressure directly affect the dust removal effect. A reasonable layout of the exhaust duct 710 (such as multiple air inlets and branch pipes) can ensure that the negative pressure is balanced in all areas of the treatment chamber 100.

[0290] The gas temperature inside the treatment chamber 100 is high (potentially reaching 200℃-400℃), so the exhaust duct 710 needs to have high-temperature resistance. The duct material is usually carbon steel or heat-resistant steel, and insulation layers or cooling measures (such as natural heat dissipation sections) are installed when necessary to prevent high temperatures from damaging the filter bags of the subsequent dust collector.

[0291] The airflow velocity inside the exhaust duct 710 needs to be designed reasonably (usually 15-20 m / s) to prevent dust from settling and accumulating inside the duct, and to avoid excessive flow velocity leading to duct wear. Wear-resistant liners or inspection and cleaning ports can be installed at duct bends and diameter changes.

[0292] Based on the distribution of dust-generating points within the processing chamber 100, the exhaust duct 710 can be designed as an air collection system with multiple branch pipes, drawing air from the vicinity of the top door, the slag dumping area, the mixing area, the screening device, etc., to achieve precise dust removal.

[0293] An air volume regulating valve (such as a butterfly valve or a slide gate valve) can be installed on the exhaust duct 710 to distribute and adjust the air volume according to the actual air volume required by each dust-generating point, so as to ensure the dust removal effect while reducing energy consumption.

[0294] There may be a fire hazard inside the exhaust duct 710 due to sparks (splattered molten steel slag) carried by high-temperature gas. A flame arrestor or spark trap can be installed on the duct to prevent sparks from entering the dust collector and causing the filter bags to burn.

[0295] The dust collector is the core equipment for gas purification in the dust removal device 700. It is used to separate and capture dust in the dust-laden gas delivered by the duct 710, so that the purified gas can be discharged in compliance with standards.

[0296] After the dust-laden gas enters the dust collector, the steel slag dust (particle size usually 0.1-100μm) carried in the gas is intercepted through separation mechanisms such as filtration, centrifugation, and electrostatics, forming dry dust that is easy to centrally dispose of.

[0297] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 The processing chamber 100 includes a sealed enclosure structure 110, the top of which is provided with an openable top door 120, which is used for hoisting the slag dumping device 300 in and out; the side of the sealed enclosure structure 110 is provided with an inspection door 130.

[0298] In this embodiment, the sealed enclosure structure 110 is the main structure of the processing chamber 100, forming a relatively enclosed space that isolates the internal equipment from the external environment.

[0299] Confining dust-laden gases generated during processes such as slag dumping, mixing, crushing, and screening within the enclosure prevents dust from spreading into the workshop environment. This is the primary prerequisite for achieving environmentally compliant emissions.

[0300] The temperature of molten steel slag reaches as high as 1200℃-1700℃, and the heat radiation poses a great hazard to surrounding equipment and personnel. The sealed enclosure structure with 110 steel plates and insulation layer effectively blocks heat radiation, significantly reducing the external ambient temperature and improving working conditions.

[0301] The mixing and crushing device 500 and the dust removal fan generate noise during operation. The sealed enclosure structure 110 has a certain sound insulation effect, reducing noise pollution in the workshop.

[0302] The enclosed enclosure structure 110 provides an installation foundation and support for the top door 120, the maintenance door 130, and internal equipment (such as the slag dumper 330, the track of the mixing and crushing device 500, the cold slag hopper 430, etc.).

[0303] After the sealed cover structure 110 is connected to the dust removal device 700, a slight negative pressure is formed inside the sealed cover structure 110, which prevents dust from escaping outward from the gaps, while ensuring that the dust-laden gas is effectively drawn into the dust collector.

[0304] The enclosed enclosure structure 110 prevents personnel from accidentally coming into contact with internal high-temperature equipment, moving parts, or splashed high-temperature materials, providing physical isolation and protection. The internal refractory insulation material reduces heat loss to the outside, facilitates waste heat recovery, and lowers the internal temperature gradient of the processing chamber 100, improving the thermal stress distribution of the equipment.

[0305] The top door 120 is located at the top of the sealed enclosure structure 110 and is used for hoisting in and out of the slag dumping device 300 (mainly the slag storage tank 320). It is the only top opening of the processing chamber 100.

[0306] The slag storage tank 320 (liquid slag tank) is hoisted by an overhead crane and needs to be entered from the top into the processing chamber 100 and placed on the slag dumping machine 330. The top door 120 provides a sufficient opening size to allow the slag storage tank 320 to pass through smoothly.

[0307] After the slag storage tank 320 is in place, the top door 120 is closed, restoring the processing chamber 100 to a sealed state. The top door 120 is only opened briefly during hoisting periods (approximately 1-3 minutes each time), and remains closed at other times to minimize dust spillage and heat loss.

[0308] A sealing device (such as a high-temperature resistant rubber sealing strip or a labyrinth seal) is provided between the top door 120 and the top plate of the sealed cover structure 110 to achieve airtightness when closed, preventing dust from escaping from the door gap.

[0309] The top door 120 is equipped with safety interlock control with the slag dumping device 300 and the dust removal device 700. When the top door 120 is not closed, the slag dumping device 300 cannot be started, and the dust removal device 700 must continue to operate; when the top door 120 is open, the dust removal air volume can be automatically reduced or maintained to prevent excessive negative pressure from causing difficulty in opening the door.

[0310] The top door 120 is typically a double-opening or single-opening type, and can be driven by hydraulics, pneumatics, or electricity, or manually (lightweight design). The drive method should ensure smooth and rapid opening and closing, and have a self-locking function.

[0311] An observation window can be installed on the top door 120 to allow operators to observe the status of the internal equipment without opening the top door. However, the observation window must be heat-resistant and explosion-proof.

[0312] The maintenance door 130 is located on the side (one or more locations) of the enclosed enclosure structure 110, for personnel to enter the processing room 100 to inspect, clean, maintain and troubleshoot equipment.

[0313] When it is necessary to check the wear of the roller teeth of the mixing and crushing device 500, clean the adhesive on the pad 220, replace the screen plate of the high temperature screen 610, or deal with internal faults, maintenance personnel can enter the processing chamber 100 through the maintenance door 130.

[0314] In emergency situations (such as equipment failure, fire, etc.), the maintenance door 130 can serve as an escape exit for personnel, improving safety.

[0315] When the equipment is shut down for maintenance, the maintenance door 130 can be opened for natural ventilation to reduce the internal temperature and dust concentration and improve maintenance working conditions.

[0316] A high-temperature resistant glass observation window can be installed on the inspection door 130, so that inspection personnel can observe the equipment status without entering the interior.

[0317] The inspection door 130 can also be used for the handling of tools and spare parts (such as roller teeth and screen plates), as well as the removal of accumulated materials.

[0318] See Figure 2 As shown, this application proposes a method for solidifying and crushing molten steel slag mixtures, applied in the aforementioned system. The method includes:

[0319] S301. Molten steel slag 310 is mixed with solid cooling medium 410 to form a mixture.

[0320] High-temperature molten steel slag (1200℃-1700℃) is mixed with low-temperature solid cooling medium (temperature ≤300℃, such as steel slag particles) in a preset ratio. The high heat capacity of the solid cooling medium is used to absorb the heat energy of the molten steel slag, so that it cools down rapidly and partially solidifies.

[0321] Molten steel slag 310 is a high-temperature liquid steel slag produced in the steelmaking process, with a temperature of 1200℃-1700℃. It is characterized by high viscosity and easy agglomeration.

[0322] Solid cooling medium 410 is low-temperature steel slag particles with a temperature ≤300℃ and a particle size that usually does not exceed 150mm. It is derived from granulated steel slag produced by the system itself or purchased steel slag.

[0323] The solid cooling medium 410 is in direct contact with the molten steel slag 310, absorbing a large amount of heat energy from the molten steel slag 310 through heat conduction, causing its own temperature to rise (up to 600℃-1200℃), while the temperature of the molten steel slag 310 drops rapidly. This process avoids the heat loss with steam in the water cooling process, retaining the waste heat in the solid cooling medium and providing a high-temperature heat source for subsequent waste heat recovery.

[0324] After the molten steel slag 310 is mixed with the solid cooling medium 410, the temperature drops sharply, and it changes from a liquid state to a semi-solid state or even a fully solid state. This eliminates the high fluidity and stickiness of the liquid steel slag, creating conditions for subsequent crushing.

[0325] The mixing process is achieved through the synchronized operation of the slag dumping device (tilting) and the feeding device (quantitative unloading). The slag dumping device evenly pours molten steel slag 310 onto the cushion layer of the mixing zone, while the feeding device distributes solid cooling medium 410 in the same area at a preset ratio (0%-30%), so that the two materials begin to interweave and mix during the material falling process.

[0326] The pre-laid cushion layer (solid steel slag particles, thickness ≥200mm) in the mixing zone also participates in the mixing. The cushion layer particles absorb the heat of the molten steel slag, preventing the high temperature from directly impacting the bottom plate. At the same time, the cushion layer particles will mix with the materials in the subsequent mixing, increasing the total amount of cooling medium.

[0327] Solid cooling medium particles surround the molten steel slag, forming a physical isolation layer, which reduces the direct contact between the molten steel slag and the equipment wall and bottom plate, and prevents large-area adhesion.

[0328] S302. The mixed materials are mixed and crushed by the mixing and crushing device 500 to obtain crushed materials.

[0329] The mixture is subjected to strong stirring, shearing, impact and friction by a movable stirring and crushing device (such as a rotating roller tooth structure), so that the molten steel slag is completely cooled and solidified, and at the same time crushed into granulated steel slag with uniform particle size.

[0330] The mixing and crushing device (such as a rotating roller tooth structure) moves back and forth in the mixing zone and rotates the roller teeth to forcefully tumble, scatter and shear the mixed materials, so that the molten steel slag that has not been fully mixed can fully contact the solid cooling medium, eliminate local overheating or undercooling areas, and ensure uniform temperature.

[0331] The stirring action continuously refreshes the heat exchange interface of the materials, enabling the heat inside the molten steel slag to be rapidly transferred to the solid cooling medium, promoting the complete solidification of the remaining liquid steel slag. Compared to static cooling, the stirring cooling rate can be increased several times.

[0332] The rotating roller teeth exert various mechanical effects on the solidified steel slag: the tips and grooves of the roller teeth generate shearing forces on the material, tearing large pieces of steel slag. The high-speed rotation of the roller teeth applies impact loads to the material, causing the brittle steel slag to disintegrate. The material is compressed and crushed between the roller teeth or between the roller teeth and the cushion layer. The solid cooling medium particles, driven by the roller teeth, rub and grind against the steel slag, refining the particles and improving their shape.

[0333] During the stirring process, the solid cooling medium particles themselves also act as crushing media. Their high hardness and sharp edges enhance the grinding and impact effects. At the same time, the medium particles are replenished with new media after wear, achieving self-consumable auxiliary crushing.

[0334] The continuous stirring action breaks down the soft agglomerates or sintered blocks that may form in the steel slag during the cooling process, ensuring that the final product is discrete particles and avoiding the formation of large, difficult-to-break pieces.

[0335] After crushing, the mixing and crushing device pushes the crushed material from the mixing zone toward the screening device through movement and roller tooth thrust, thus achieving automatic process connection.

[0336] S303. The crushed material is separated according to particle size by the screening device 600.

[0337] The crushed material is separated by particle size using a screening device (such as a high-temperature screen). The undersize material (granulated steel slag) is transported as a product to the subsequent waste heat recovery process, while the oversize material (large slag pieces) is collected and returned to the system for further processing or disposal.

[0338] The crushed material enters the high-temperature screen of the screening device, where the screen openings (usually 50mm-200mm) divide the material into two parts:

[0339] Undersized material (granulated steel slag): Particles smaller than the sieve openings are considered qualified products.

[0340] Oversize material (large slag): Particles larger than the sieve openings, which are lumpy materials that have not been fully crushed.

[0341] The undersized material slides down by gravity through the first slag chute (granulated slag chute) to the collection equipment (such as a slag pot, chain bucket, or conveyor belt), and is then sent to the subsequent waste heat recovery system (such as a rotary waste heat utilization device). The temperature (600℃-1200℃) and particle size (≤50mm) of the undersized material meet the raw material requirements of the waste heat recovery equipment.

[0342] The material oversizes falls into the slag receiving car through the second slag chute (large slag chute). Large slag pieces can be periodically transported back to the system and re-added to the mixing zone for further mixing and crushing to improve resource utilization; they can also be disposed of separately as building material raw materials.

[0343] The inclination angle and vibration (if applicable) of the high-temperature screen ensure that the material is evenly spread and slides smoothly, avoiding accumulation. If necessary, the screen opening can be adjusted or the screen plate can be replaced to adapt to different product specifications.

[0344] The dust generated during the screening process is collected by the dust removal device through the air intake to keep the environment clean.

[0345] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 2 Molten steel slag 310 is mixed with solid cooling medium 410 to form a mixture comprising:

[0346] Molten steel slag 310 is poured into mixing zone 200 by slag dumping device 300, and solid cooling medium 410 is added to mixing zone 200 by feeding device 400, so that molten steel slag 310 and solid cooling medium 410 are mixed in a preset ratio.

[0347] The preset ratio is the core control parameter for the mixing process.

[0348] Operators set the mass ratio of solid cooling medium to molten steel slag in the control system based on the temperature (1200℃-1700℃), viscosity, and target discharge temperature (600℃-1200℃) of the molten steel slag. The typical range is 0%-30%. For example, a higher ratio (e.g., 25%-30%) is used for molten steel slag at higher temperatures, and a lower ratio (e.g., 10%-15%) is used for molten steel slag at lower temperatures.

[0349] The control system monitors the tilting rate of the slag dumping device 300 in real time (estimated by tilting angle, time, or liquid level sensors) and dynamically adjusts the opening of the discharge valve 440 to ensure that the addition rate of the solid cooling medium is in a preset ratio to the tilting rate of the molten steel slag. If the tilting rate fluctuates, the feeding rate is adjusted accordingly to maintain a constant ratio.

[0350] After a single tank is finished, the control system calculates the ratio of the total amount of solid cooling medium actually added to the total amount of molten steel slag. If it deviates from the preset value, the feeding parameters for the next tank can be automatically corrected.

[0351] For molten steel slag with high viscosity (poor fluidity), the proportion of solid cooling medium can be appropriately increased to enhance the lubrication and dispersion between particles; for steel slag with good fluidity, the proportion can be reduced to save media.

[0352] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 2 The mixture is stirred and crushed by a stirring and crushing device 500 to obtain crushed materials, including:

[0353] The mixture is crushed in stages by a multi-stage roller tooth structure, which includes a first crushing roller tooth and a second crushing roller tooth. The first crushing roller tooth performs preliminary crushing of the mixture, and the second crushing roller tooth performs a second crushing of the material after preliminary crushing.

[0354] In this embodiment, two (or more) sets of roller teeth with different parameters are set on the same mixing and crushing device to undertake the tasks of coarse crushing and fine crushing, respectively. The first crushing roller teeth are characterized by large size, low speed and high torque, and prioritize the processing of large slag pieces; the second crushing roller teeth are characterized by small size, high speed and high shear, and are responsible for refining particles.

[0355] The crushing process is divided into two (or more) stages. The coarse crushing stage quickly eliminates large pieces of material, reducing the impact on the fine crushing stage. The fine crushing stage focuses on particle size control to ensure product uniformity.

[0356] The first crushing roller has a large tooth pitch, coarse tooth shape, and low rotation speed, making it suitable for high-load impact; the second crushing roller has a small tooth pitch, sharp tooth shape, and high rotation speed, making it suitable for shearing and grinding.

[0357] Two sets of roller teeth are installed on the same moving platform and act on the material in sequence, eliminating the need for intermediate transfer and achieving two-stage crushing in one trip.

[0358] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 2 The crushed material is separated according to particle size by a screening device 600, including:

[0359] The crushed material is screened into undersize material 640 and oversize material 650 by a high-temperature screen 610; the undersize material 640 is discharged through the first slag chute 620 as granulated steel slag; the oversize material 650 is discharged through the second slag chute 630 as blocky steel slag.

[0360] In this embodiment, a high-temperature resistant screen is used to dry screen the hot steel slag at an environment of 600℃-1200℃ to achieve precise particle size separation.

[0361] The undersize and oversize materials slide down the chutes by their own weight, requiring no power, making it energy-efficient and structurally simple. The first and second slag chutes are arranged independently to ensure that the two materials do not interfere with each other and enter their respective subsequent processing paths. The screening device is located adjacent to the mixing zone, and the crushed material is directly pushed onto the screen surface, achieving immediate crushing and screening without intermediate transfer.

[0362] How this application works:

[0363] Slag Discharge and Mixing: The slag truck 800 transports the slag storage tank 320 containing molten steel slag 310 to the processing chamber 100. The top door 120 is opened, and the slag storage tank 320 is hoisted onto the slag dumping machine 330 using an overhead crane. The top door 120 is then closed. The slag dumping machine 330 is started, and the molten steel slag 310 is poured onto the cushion layer 220 of the mixing zone 200 at a certain rate. At the same time, the discharge valve 440 under the cold slag hopper 430 is opened, and the solid cooling medium 410 conveyed by the conveyor 420 is mixed with the molten steel slag 310 in a certain proportion and poured onto the cushion layer 220.

[0364] Slag mixing, solidification, and crushing: After slag dumping is completed, the top door 120 is opened, and the slag storage tank 320 is lifted from the slag dumping machine 330 using a crane. The top door 120 is then closed. The slag mixer is started to stir and mix the molten steel slag 310 and solid cooling medium 410 poured into the mixing zone 200 and the cushion layer 220. The high-temperature molten steel slag 310 rapidly cools down upon contact with the solid cooling medium 410, quickly transforming into solid steel slag. The slag mixer can move above the mixing zone 200 while stirring and crushing. After a certain period of stirring and crushing, the mixture of molten steel slag 310 and solid cooling medium 410 quickly transforms into granulated steel slag with a certain temperature and particle size.

[0365] Slag Separation: After the slag mixing, solidification, and crushing are completed, a slag mixer is used to push and move the granulated steel slag from the pad 220 of the mixing zone 200 onto the high-temperature screen 610. During the movement of the granulated steel slag from the high-temperature screen 610, smaller granulated steel slag particles fall from the granulated slag chute and can be transported out through slag pots or chain buckets for waste heat recovery; larger slag particles are pushed from above the high-temperature screen 610 onto the large slag chute and fall into the large slag pot. After filling, the pot is transported by slag receiving car 660 and overhead crane.

[0366] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0367] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0368] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0369] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0370] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A molten steel slag mixing, solidification, and crushing system, characterized in that, include: Processing room; The mixing area is located within the processing chamber; A slag-pouring device, installed in the processing chamber, is used to pour molten steel slag into the mixing zone; A feeding device, connected to the processing chamber, is used to deliver solid cooling medium into the mixing zone; A mixing and crushing device is installed in the mixing zone to mix the molten steel slag with the solid cooling medium, thereby cooling, solidifying, and crushing the molten steel slag into granules. A screening device is installed on one side of the mixing zone to separate and output the crushed and granulated steel slag according to its particle size. The dust removal device is connected to the processing chamber.

2. The molten steel slag mixing, solidification, and crushing system according to claim 1, characterized in that, The mixing zone includes a base plate and a cushion layer. The base plate is laid on the bottom wall of the processing chamber, and the cushion layer is laid on the base plate.

3. The molten steel slag mixing, solidification, and crushing system according to claim 2, characterized in that, The slag dumping device includes a slag storage tank and a slag dumping machine. The slag storage tank is connected to the slag dumping machine, and the output end of the slag dumping machine is located above the mixing zone. The molten steel slag is dumped onto the cushion layer by the slag dumping machine.

4. The molten steel slag mixing, solidification, and crushing system according to claim 2, characterized in that, The feeding device includes a conveyor, a cold slag hopper, and a discharge valve. The output end of the conveyor is connected to the opening of the cold slag hopper, and the conveyor transports the solid cooling medium into the cold slag hopper. The cold slag hopper is positioned above the mixing zone; the discharge valve is installed at the discharge port at the bottom of the cold slag hopper.

5. The molten steel slag mixing, solidification, and crushing system according to any one of claims 2 to 4, characterized in that, The mixing and crushing device includes a rotating roller tooth structure, which is movably disposed in the processing chamber. The movement path of the rotating roller tooth structure covers the mixing zone and the area where the screening device is located.

6. The molten steel slag mixing, solidification, and crushing system according to claim 5, characterized in that, The rotating roller tooth structure includes a first crushing roller tooth and a second crushing roller tooth arranged sequentially along the direction of motion; the rotational speed of the first crushing roller tooth is lower than that of the second crushing roller tooth.

7. The molten steel slag mixing, solidification, and crushing system according to any one of claims 2 to 4, characterized in that, The screening device includes a high-temperature screen, a first slag chute, and a second slag chute; the high-temperature screen is used to screen the crushed and granulated steel slag into undersize material and oversize material. The first slag chute is connected to the high-temperature screen and is used to discharge the undersize material. The second slag chute is connected to the high-temperature screen and is used to discharge the material on the screen; The second slag chute is connected to the slag receiving car.

8. The molten steel slag mixing, solidification, and crushing system according to claim 7, characterized in that, The slag receiving vehicle is an electrically driven transport vehicle with a steel structure, used to transport the material on the screen.

9. The molten steel slag mixing, solidification, and crushing system according to any one of claims 2 to 4, characterized in that, The dust removal device includes an exhaust duct, one end of which is connected to the processing chamber and the other end is connected to the dust collector.

10. The molten steel slag mixing, solidification, and crushing system according to any one of claims 2 to 4, characterized in that, The processing chamber includes a sealed enclosure structure, and the top of the sealed enclosure structure is provided with an openable top door, which is used for hoisting the slag dumping device in and out. The sealed enclosure structure is equipped with an inspection door on its side.

11. A method for solidifying and crushing molten steel slag mixture, applied in the system described in any one of claims 1 to 10, the method comprising: Molten steel slag is mixed with a solid cooling medium to form a mixture. The mixture is stirred and crushed by a stirring and crushing device to obtain crushed material; The crushed material is separated according to its particle size using a screening device.

12. The method according to claim 11, characterized in that, The process of mixing molten steel slag with a solid cooling medium to form a mixture includes: The molten steel slag is poured into the mixing zone by a slag dumping device, and the solid cooling medium is added to the mixing zone by a feeding device, so that the molten steel slag and the solid cooling medium are mixed in a preset ratio.

13. The method according to claim 11, characterized in that, The process of mixing and crushing the mixture using a mixing and crushing device to obtain crushed material includes: The mixture is crushed in stages by a multi-stage roller tooth structure, wherein the multi-stage roller tooth includes a first crushing roller tooth and a second crushing roller tooth. The mixture is initially crushed by the first crushing roller teeth; The material after initial crushing is further crushed by the second crushing roller teeth.

14. The method according to claim 11, characterized in that, The separation of crushed materials according to particle size by a screening device includes: The crushed material is screened into undersize material and oversize material using a high-temperature screen. The undersize material is discharged through the first slag chute and used as granulated steel slag. The material over the screen is discharged through the second slag chute as blocky steel slag.

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