Rapid modification device for large-particle-size steel slag

Abstract

The large-particle-size steel slag modification device comprises a reaction system and an air supply system, the reaction system comprises a reaction cylinder and a rotating device, the reaction cylinder is movably connected to the rotating device, an air inlet pipe and a first material opening are arranged on the reaction cylinder, a plurality of groups of spirally-distributed flow guide plates are arranged on the inner wall of the reaction cylinder, and the flow guide plates are arranged on the outer wall of the reaction cylinder. The air supply system comprises a steam generator, a carbon dioxide conveying device and a pressure pump, the steam outlet end of the steam generator and the gas outlet end of the carbon dioxide conveying device are both connected with the inlet end of the pressure pump, and the outlet end of the pressure pump is connected with the air inlet pipe. According to the utility model, the reaction cylinder rotates by 360 degrees, so that large-particle-size steel slag generates continuous waterfall type movement, the gas-solid contact area and the carbon dioxide diffusion rate are increased, and the reaction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of steel slag modification devices, specifically to a rapid modification device for large-particle-size steel slag. Background Technology

[0002] my country's steel industry generates nearly 100 million tons of steel slag annually, and its resource utilization is of great significance for alleviating environmental pressure and reducing carbon emissions. Steel slag is rich in alkaline oxides such as CaO; theoretically, each ton of steel slag can absorb approximately 150 kg of CO2. This not only achieves carbon fixation but also reduces the content of free calcium oxide, improving the stability of the steel slag and making it more suitable for building materials and other fields. However, current industrial modification technologies for large-particle steel slag (particle size ≥ 10 mm) still face significant bottlenecks. Specifically, current wet carbon fixation and fluidized bed technologies are the mainstream, mainly targeting steel slag powder (particle size ≤ 1 mm), relying on sufficient gas-solid contact to achieve the reaction. However, large-particle steel slag, due to its small surface area and large interparticle gaps, suffers from low gas diffusion efficiency and a drastically reduced reaction rate, making it difficult to achieve the expected carbon fixation effect. While the reactor heating and pressurization method can be applied to the carbon fixation modification of large-particle steel slag, it has the following drawbacks: Under static reaction conditions, the accumulation of steel slag leads to uneven gas distribution and insufficient internal reaction; frequent start-up and shutdown of the equipment are required for sampling and testing, which is cumbersome and disrupts the continuity of the reaction; high energy consumption, as maintaining high temperature and high pressure requires a large amount of energy, resulting in poor economic efficiency; and large-particle steel slag tends to accumulate at the discharge port, requiring manual intervention for cleaning, which poses a safety hazard.

[0003] Large-diameter steel slag is heavy and has poor fluidity, making it difficult for traditional fluidized beds to achieve effective fluidization, which can easily lead to equipment blockage or wear. Since the gas-solid reaction rate is inversely proportional to particle size, large-diameter steel slag requires a longer time to complete the carbon fixation reaction, making it difficult to meet the demands of continuous industrial production. Therefore, existing steel slag powder modification devices cannot be directly applied to large-diameter steel slag. Long-term accumulation of untreated steel slag can cause environmental problems such as dust and soil alkalization due to the hydration and expansion of free calcium oxide. With the advancement of "dual carbon" goals and increasingly stringent environmental regulations, the demand for steel slag resource utilization is urgent. However, existing technologies have low processing efficiency for large-diameter steel slag, resulting in a large amount of steel slag that cannot be effectively utilized, wasting resources and exacerbating the environmental burden. Therefore, developing a modification device that adapts to the characteristics of large-diameter slag, achieves rapid carbon fixation, and is easy to operate has become a pressing technical challenge for the industry. Utility Model Content

[0004] The purpose of this invention is to provide a rapid modification device for large-particle-size steel slag. By enhancing gas-solid mixing through dynamic rotation and optimizing the discharge structure to reduce the risk of jamming, it breaks through the technical bottleneck of large-particle-size steel slag modification and provides a feasible path for steel slag resource utilization and carbon emission reduction.

[0005] To achieve the above objectives, the present invention proposes the following technical solution:

[0006] A large-particle-size steel slag modification device, comprising:

[0007] The reaction system includes a reaction cylinder and a rotating device. The rotating device is mounted on a flat surface via a fixed support. The reaction cylinder is movably connected to the rotating device. The circumferential side wall of the reaction cylinder is provided with a material inlet, and an air inlet pipe is provided on one of its end side walls. A material gate is provided at one of the material inlets. The inner wall of the reaction cylinder is provided with several sets of spirally distributed guide plates. The guide plates form an angle of 55°-65° with the axis of the reaction cylinder.

[0008] The gas supply system includes a steam generator, a carbon dioxide delivery device, and a booster pump. The steam outlet of the steam generator and the gas outlet of the carbon dioxide delivery device are both connected to the inlet of the booster pump, and the outlet of the booster pump is connected to the air inlet pipe.

[0009] As a preferred technical solution of this utility model, it also includes a pre-humidification system, which includes a pre-humidification cylinder and a pre-humidification support. The pre-humidification cylinder is connected to the pre-humidification support through a connecting shaft, and the bottom end of the pre-humidification cylinder is higher than the top end of the reaction cylinder. A second material inlet is opened on the top side wall of the pre-humidification cylinder, and a second material gate is provided at the second material inlet.

[0010] As a preferred technical solution of this utility model, it also includes a discharge system, which includes a discharge platform and a transport vehicle. The discharge platform is disposed between the reaction system and the pre-humidification system. The discharge platform is provided with a ramp, the slope of which faces one side of the reaction cylinder. The bottom end of the ramp is the discharge end and is lower than the bottom end of the reaction cylinder. The transport vehicle is located at the discharge end of the discharge platform and is below the reaction cylinder.

[0011] As a preferred embodiment of this utility model, the material transport vehicle is equipped with a lifting device.

[0012] As a preferred embodiment of the present invention, the rotating device includes a first gear, a second gear, and a drive motor. The two ends of the reaction cylinder are provided with end shafts, and the other end of the end shaft is fixed to the fixed bracket by a bearing. The first gear is fixed to the end shaft, and the second gear is fixed to the output shaft of the drive motor and meshes with the first gear.

[0013] As a preferred embodiment of this invention, the reaction cylinder is provided with an insulation layer on its exterior.

[0014] As a preferred embodiment of this utility model, the air inlet pipe is located at the midpoint of the end side wall of the reaction cylinder, and the air inlet end of the air inlet pipe is provided with a rotary joint.

[0015] As a preferred technical solution of this utility model, it also includes a PLC control system, which is electrically connected to the reaction system, the gas supply system and the prehumidification system respectively, and controls the coordinated operation of the reaction system, the prehumidification system and the gas supply system.

[0016] The technical solution of this utility model provides a rapid modification device for large-particle-size steel slag, which has the following advantages compared with the prior art:

[0017] 1. By rotating the reaction cylinder 360°, large-diameter steel slag particles are made to generate a continuous "waterfall-like" motion, increasing the gas-solid contact area by 3-5 times, increasing the carbon dioxide diffusion rate by 40%-60%, and significantly shortening the carbon fixation reaction time under the same conditions; the spiral distribution of the guide plates creates axial material propulsion force, prolonging the average residence time of the steel slag, and combined with a specific tilt angle to generate a balance between centrifugal force and gravitational force, realizing the three-dimensional throwing motion of steel slag particles;

[0018] 2. The pre-wetting system pre-mixes and wets steel slag with water, activates the CaO hydration reaction, and forms a surface liquid film to promote carbon dioxide penetration, thereby increasing the reaction rate.

[0019] 3. The unloading platform reduces the risk of material jamming and endangering personnel safety during unloading, and also greatly improves the convenience of material discharge and reduces the difficulty of manual cleaning.

[0020] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0021] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0022] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the rapid modification device for large-particle-size steel slag according to an embodiment of this utility model;

[0024] Figure 2 This is a side view of the rapid modification device for large-particle-size steel slag according to an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the layout structure of the guide plate inside the reaction cylinder in an embodiment of the present invention.

[0026] The meanings of the reference numerals in the figure are as follows:

[0027] 1-PLC control system 2-Pressure pump 3-Steam generator 4-Gas delivery pipe 5-Rotary joint 6-Material carrier 7-Fixed bracket 8-Rotating device 9-Pressure relief valve 10-Reaction cylinder 11-Material inlet 12-Base 13-Pre-wetting bracket 14-Connecting shaft 15-Pre-wetting cylinder 16-Pressure gauge 17-Unloading platform 18-Guide plate 19-Insulation layer Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0029] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] To address the technical challenge of low processing efficiency for large-diameter steel slag in existing technologies, which leads to the ineffective utilization of large quantities of steel slag, this utility model provides a large-diameter steel slag modification device, comprising a reaction system, an air supply system, a pre-humidification system, a discharge system, and a PLC control system 1.

[0031] In this embodiment of the invention, the reaction system is the main site for the reaction and carbon fixation of large-particle steel slag with carbon dioxide. The large-particle steel slag located within this system comes into full contact with and reacts with the carbon dioxide gas. For example... Figure 1 , Figure 2As shown, the reaction system includes a reaction cylinder 10 and a rotating device 8. The rotating device 8 is mounted on a flat surface via a fixed support 7. The reaction cylinder 10 is movably connected to the rotating device 8, and the rotating device 8 drives the reaction cylinder 10 to rotate, thus mixing the materials inside the reaction cylinder 10. The fixed support 7 has a horizontally placed I-shaped structure, with its two ends corresponding to the two ends of the reaction cylinder 10. A discharge space is reserved in the middle of the fixed support 7 (i.e., directly below the reaction cylinder 10) for the material transport vehicle 6 to move freely. The height of the discharge space is such that the material inlet 11 of the reaction cylinder does not collide with the material transport vehicle 6 when the reaction cylinder rotates 360°, avoiding mutual restriction of movement between the reaction cylinder 10 and the material transport vehicle 6 due to unreasonable space height settings. The rotating device 8 is used to drive the reaction cylinder 10 to rotate repeatedly 360°, so that the large-diameter steel slag inside the reaction cylinder 10 can fully contact and react with carbon dioxide gas. It mainly includes a first gear (driven gear), a second gear (driving gear), and a drive motor. The first gear is connected to the two end walls of the reaction cylinder 10 via an end shaft. One end of the end shaft is welded or fixed to both ends of the reaction cylinder 10 by a keyway, and the other end is fixed to the fixed bracket 7 by a bearing. The bearing type can be a deep groove bearing or a self-aligning roller bearing, depending on the load and speed. The first gear can be fixed to the end shaft (near the outside of the bearing) by a key connection or interference fit. It is important to ensure that the first gear is coaxial with the end shaft to avoid eccentricity that could cause vibration. The second gear can be fixed to the output shaft of the drive motor via a keyway or flange connection and meshes with the first gear. The tooth pitch matches the module. The drive motor is fixed to the fixed bracket 7 by a flange or mounting plate. The position of the drive motor can be adjusted according to the actual situation to control the gear meshing clearance. Furthermore, a reducer, such as a planetary gear reducer or a worm gear reducer, can be added to the output end of the drive motor to increase output stability, thereby reducing the speed of the drive motor and increasing the torque. All the equipment and components involved in the above-mentioned rotating device are common knowledge in the field. Those skilled in the art are familiar with their mechanical connections and operating principles, so they will not be described in detail here. This technical solution only applies the rotating device conventionally and does not involve any structural improvements. Its internal structure, mechanical connections, electrical connections, and working principles are all common knowledge well known to those skilled in the art. Therefore, detailed connections between them, such as the mechanical connection between the drive motor and the second gear, and the electrical connection between the drive motor and the PLC control system 1, will not be described in detail here. In addition, the rotating device 8 can adopt not only the gear transmission method mentioned above, but also the belt transmission method. Any existing technology that can drive the reaction cylinder 10 to rotate freely 360° on the fixed support is acceptable and is not strictly limited here.The reaction cylinder 10 can rotate in multiple modes, such as 360° counterclockwise rotation, 360° clockwise rotation, or alternating 360° counterclockwise and clockwise rotation. The rotation mode can be achieved by using the forward and reverse rotation of the drive motor according to the actual working conditions, ensuring sufficient contact and reaction between the large-particle steel slag and carbon dioxide gas, thus improving the modification efficiency of the steel slag. If the material only moves in a circular motion with the cylinder, mixing relies on gravity, resulting in low energy utilization. Therefore, further... Figure 3 As shown, several sets of spirally distributed guide plates 18 are provided on the inner wall of the reaction cylinder 10, with the guide plates 18 forming an angle of 55°-65° with the axis of the reaction cylinder 10. The inclination angle of the guide plates 18 forces the steel slag to be pushed towards one end of the cylinder along the spiral direction as the reaction cylinder 10 rotates (similar to a screw conveyor), forming axial movement. This avoids the steel slag from accumulating only locally at the bottom of the reaction cylinder 10, promoting the uniform distribution of materials along the length of the cylinder. When the reaction cylinder 10 rotates, the guide plates 18 lift the material to a certain height and then drop it, generating radial diffusion. During the free fall, the steel slag is dispersed due to gravity, increasing the probability of particle collision at different positions and making the mixing more thorough. In addition, shear forces are generated between the guide plates and the steel slag, and between the steel slag and the surface of the guide plates 18. Especially when the steel slag is lifted by the guide plates 18, the materials at different speed layers rub against each other, accelerating particle refinement or reactant contact. The spirally distributed guide plates form a continuous flow channel, and the material constantly changes position during the tumbling process, eliminating local concentration differences through turbulent diffusion and molecular diffusion.

[0032] A feed inlet 11 is provided on the circumferential side wall of the reaction cylinder 10. This feed inlet 11 is located in the middle of the circumferential side wall and can be used for both feeding (before reaction) and discharging (after reaction) large-diameter steel slag. In traditional rotary kilns, the feed inlet is generally located at one end. During discharge, the longest discharge distance for slag extends from the innermost to the outermost end of the rotary kiln (spanning the entire axial length of the kiln). Therefore, the discharge speed of a rotary kiln is slow, and the discharge effect on fine particles is poor, causing them to adhere to the inner wall. Furthermore, the slag at deeper points is difficult to clean due to the long cleaning distance. This invention places the feed inlet 11 in the middle of the reaction cylinder 10. Compared to the traditional rotary kiln method of discharging from the ends, the discharge speed is faster and the effect is better. Cleaning can also be done from the middle of the device towards both ends, with a shorter cleaning distance, making it convenient and quick. Meanwhile, to prevent the material inside the reaction cylinder 10 from falling out during rotation, a material gate 1 is installed at the material inlet 11. This gate only opens during feeding or discharging and remains closed at other times. To further increase the automation level of the system, the material gate 1 can be electromagnetically driven and electrically connected to the PLC control system. The PLC control system 1 can remotely control the opening and closing of the material gate 1, keeping the material inlet 11 open during feeding or discharging and closed when the reaction cylinder 10 rotates. To accurately monitor the material reaction inside the reaction cylinder 10, humidity sensors, temperature sensors, and other sensors are installed inside the reaction cylinder 10. These sensors are all electrically connected to the PLC control system 1. The humidity and temperature sensors detect the humidity and temperature inside the reaction cylinder 10, respectively, to monitor the material reaction inside the reaction cylinder 10.

[0033] An air inlet pipe is provided on one end sidewall of the reaction cylinder 10. To facilitate the rotation of the air inlet pipe along with the reaction cylinder 10, the air inlet pipe is positioned at the midpoint of the end sidewall of the reaction cylinder 10. Furthermore, to prevent the gas delivery pipe of the pressurizing pump 2, connected to the air inlet pipe, from becoming entangled as the reaction cylinder 10 rotates, a rotary joint 5 is provided at the air inlet end of the air inlet pipe. The rotary joint 5 connects the air inlet pipe and the gas delivery pipe 4, allowing the air inlet pipe to rotate synchronously with the reaction cylinder 10 while the gas delivery pipe 4 does not rotate with the reaction cylinder 10. The rotary joint 5 can utilize existing technology; it is only applied here without further improvement. Connecting two pipes together using a rotary joint is a conventional technique, therefore its specific structure and working principle will not be elaborated further. As can be seen from the above-described installation arrangement of the rotating device 8, an end shaft is also provided at the end of the reaction cylinder 10 to connect to the first gear. However, to allow the reaction cylinder to rotate around its central axis, the end shaft is typically positioned at the center point of its end, thus conflicting with the arrangement of the air inlet pipe. Therefore, to avoid spatial conflicts between the end shaft and the inlet pipe, a simple and reasonable structural design can achieve a coordinated layout for both. For example, the original solid end shaft can be replaced with a hollow shaft, with the inner hole of the hollow shaft serving as a gas passage, directly connecting to the interior of the reaction cylinder 10 (i.e., replacing the traditional inlet pipe with a hollow shaft). A rotary joint 5 is installed on the outside of the hollow shaft (at the end near the fixed support 7), and the gas delivery pipe 4 is connected to the hollow shaft through the rotary joint 5. The rotary joint 5 can be selected from existing technologies that can withstand the rotational speed, gas pressure, and temperature of the reaction cylinder 10 (such as a single-channel high-pressure rotary joint). At the same time, the first gear is fixed to the outside of the hollow shaft via a key connection or flange (avoiding the installation area of ​​the rotary joint), and the bearing is installed at the end of the hollow shaft. The inner ring of the bearing is interference-fitted with the hollow shaft, and the outer ring is fixed in the bearing seat of the fixed support. This layout makes the entire structure compact, integrating the gas passage and the rotating shaft, requiring no additional space, and only requiring sealing at the rotary joint, resulting in centralized sealing and convenient maintenance.

[0034] The reaction cylinder 10 is externally equipped with a thermal insulation layer. The gas introduced into the reaction cylinder 10 is mainly a mixture of high-temperature water vapor and carbon dioxide. Because gaseous water and carbon dioxide can increase their contact area with the steel slag, thereby improving reaction efficiency, it is necessary to keep them in a gaseous state as much as possible. Therefore, to prevent the high-temperature water vapor from being rapidly cooled during the reaction, a thermal insulation layer 19 is installed to keep the reaction cylinder 10 warm, which helps to improve reaction efficiency. In addition, the thermal insulation layer 19 also has a protective function to prevent it from being corroded.

[0035] Steel slag is an industrial solid waste generated during steel smelting. It contains abundant calcium, magnesium, iron, and other metal oxides. Traditional stockpiling or landfilling leads to waste of land resources and environmental pollution. One more environmentally friendly treatment method is to use it as a building material in the construction industry, thus "turning waste into treasure." This not only consumes a large amount of steel slag but also provides valuable building material resources. However, due to its high content of calcium oxide and magnesium oxide, steel slag cannot be used directly as a building material. Therefore, the traditional approach is to react it with carbon dioxide to produce stable calcium carbonate. This not only achieves carbon sequestration and emission reduction but also improves the performance of the steel slag, making it suitable for use in the construction industry and turning it into a valuable resource. The wet modification and carbon sequestration reaction of steel slag mainly involves the reaction of calcium and magnesium oxides in the steel slag with water or moisture to form hydroxides, which further react with carbon dioxide. The main reaction formulas are as follows:

[0036] Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

[0037] Mg(OH)₂ + CO₂ → MgCO₃ + H₂O

[0038] Therefore, this embodiment of the invention also includes an important gas supply system to provide the reaction system with a sufficient mixture of carbon dioxide and water vapor. This gas supply system includes a steam generator 3, a carbon dioxide delivery device, and a pressurizing pump 2. The steam outlet of the steam generator 3 and the gas outlet of the carbon dioxide delivery device are both connected to the inlet of the pressurizing pump 2. The outlet of the pressurizing pump 2 is connected to an inlet pipe. After being mixed and pressurized by the pressurizing pump 2, the two gases are delivered to the reaction cylinder 10, where they contact and react with the steel slag inside the reaction cylinder 10. In some embodiments, the steam generator 3 can be replaced with an industrial steam delivery pipe, utilizing by-product steam generated in industrial production to mix with carbon dioxide, thereby achieving waste heat recovery and resource utilization. In this embodiment of the invention, the carbon dioxide is obtained from lime kiln tail gas as the carbon source for the carbon fixation reaction. The carbon dioxide content in this type of lime kiln tail gas is approximately 15%-20%, thus achieving the purpose of carbon fixation, reducing carbon emissions, and modifying the steel slag. To monitor and regulate the internal pressure of the reaction chamber 10 during the reaction process, a pressure gauge 16 and a pressure relief valve 9 are installed on the reaction chamber 10, and both the pressure gauge 16 and the pressure relief valve 9 are electrically connected to the PLC control system 1. When the pressure gauge 16 detects that the internal pressure of the reaction chamber 10 exceeds the safe range, the PLC control system 1 immediately opens the pressure relief valve 9 to relieve pressure and prevent the risk of excessive pressure inside the reaction chamber 10. If the internal pressure of the reaction chamber 10 is within the safe range, the pressure relief valve 9 remains closed.

[0039] The calcium oxide on the surface of dry, large-particle steel slag exhibits low activity, resulting in slow reaction kinetics when it directly contacts carbon dioxide. Pre-humidification treatment can activate the chemical activity of the steel slag surface. Large-particle steel slag faces a bottleneck in carbon fixation due to its small surface area and low porosity. To improve the efficiency of carbon fixation modification, this embodiment of the invention pre-mixes and humidifies the steel slag with water before the carbon fixation reaction. Pre-humidification treatment offers several advantages: First, the wetted surface of the steel slag forms a reaction film, enhancing the diffusion and penetration of carbon dioxide; second, the shear force generated by stirring can peel off the passivation layer on the steel slag surface, exposing a fresh reaction interface; third, controlling the water content between 8% and 12% optimizes the gas-solid-liquid three-phase reaction equilibrium; and fourth, it avoids uneven moisture distribution caused by direct steam humidification. Therefore, this utility model also includes a pre-humidification system, comprising a pre-humidification cylinder 15 and a pre-humidification support 13. The pre-humidification cylinder 15 is connected to the pre-humidification support 13 via a connecting shaft 14, with the bottom of the pre-humidification cylinder 15 higher than the top of the reaction cylinder 10. A second material inlet is provided on the top side wall of the pre-humidification cylinder 15, and a second material gate is provided at the second material inlet. Specifically, a base 12 is provided on one side of the reaction system. A certain space is reserved between the base 12 and the reaction cylinder 10 for the installation of the unloading platform 17. The pre-humidification support 13 is located at the top of the base 12, so that the bottom of the pre-humidification cylinder 15 on the pre-humidification support 13 is higher than the first material inlet 11 at the top of the reaction cylinder 10. By raising the base 12, the height of the pre-humidification support 13 does not need to be set too high to ensure that the pre-humidification cylinder 15 is at a sufficient height. This is because setting the pre-humidification support 13 too high would cause its center of gravity to be too high, resulting in instability during stirring. Therefore, the base 12 is used to mitigate the defect of unstable center of gravity. During pre-mixing and humidification, large-diameter steel slag is poured into the pre-humidification cylinder 15, and then a certain proportion of water is added and stirred. After pre-humidification is completed, the angle of the pre-humidification cylinder 15 is adjusted so that the second inlet of the pre-humidification cylinder 15 is tilted to align with the first inlet of the reaction cylinder 10. Then, the second inlet gate is opened, allowing the material in the pre-humidification cylinder 15 to fall into the reaction cylinder 10 under gravity. For ease of automation control, the second inlet gate can be designed with an electromagnetic drive, just like the first inlet gate. The tilting of the pre-humidification cylinder can be achieved by manually rotating the pre-humidification cylinder 15 or the connecting shaft 14, or by using a cylinder drive, as long as the second inlet of the pre-humidification cylinder 15 can be tilted to align with the first inlet of the reaction cylinder 10. No specific limitation is made here.

[0040] This invention improves the carbon fixation efficiency of large-particle steel slag by 2-3 times compared to traditional dry treatment through pre-wetting treatment. The liquid film formed on the particle surface during pre-wetting enhances the capillary effect, promoting the penetration of carbon dioxide into the aggregate. Furthermore, the angle of repose of the stirred steel slag decreases by approximately 15°, improving the flowability of the material within the reaction tank 10. In addition, the pre-wetting system enables continuous operation of the reaction tank 10. While the material in the reaction tank 10 is reacting, the pre-wetting tank 15 can pre-wet the next batch of steel slag undergoing carbon fixation. After the reaction in the reaction tank 10 is completed and the material is unloaded, the pre-wetted steel slag can be immediately introduced into the reaction tank 10, achieving continuous operation. To shorten the pre-wetting time and ensure uniform wetting of the steel slag within the pre-wetting tank 15, a rotating device can be installed on the pre-wetting tank 15, similar to the reaction tank 10, allowing the pre-wetting tank 15 to rotate and thus agitate the material inside.

[0041] To facilitate the unloading of the reaction vessel 10, this invention also includes an unloading system. The unloading system includes an unloading platform 17 and a transport vehicle 6. The unloading platform 17 is positioned between the reaction system and the pre-humidification system, specifically as follows: Figure 1 As shown, the unloading platform 17 is located in the space reserved between the base 12 and the reaction cylinder 10. The unloading platform 17 has a ramp, with the slope facing one side of the reaction cylinder. The bottom end of the ramp is the unloading end and is lower than the top of the reaction cylinder 10. The conveying vehicle 6 is located at the unloading end of the unloading platform and is below the reaction cylinder 10. After the steel slag and carbon dioxide have reacted, the reaction cylinder 10 is rotated so that its discharge port 11 is tilted towards the ramp. Then, the material inside the reaction cylinder 10 is opened so that it slowly falls onto the ramp. Then, it falls down the ramp onto the conveying vehicle 6 at the bottom. Finally, the reaction cylinder 10 is rotated 180° so that the discharge port 11 is directly aligned with the conveying vehicle 6 below it, and all the material inside the reaction cylinder 10 is discharged. This unloading method is safer than the traditional method of directly flipping the material inlet 11 to the bottom for unloading. In the latter method, the weight of the material is entirely concentrated on the material inlet 1. When the material inlet 1 opens, the gravitational potential energy is released suddenly and uniformly, which could endanger personnel around the material inlet 1 or create a momentary impact on the transport vehicle 6. Over time, this could lead to accumulated damage. Therefore, this invention adopts the former method, where the material inlet 11 slowly flips downwards from the top of the reaction cylinder 10. During this process, the material slides down the slope into the transport vehicle 6, gradually reducing the total gravitational potential energy of the reaction cylinder 10 until it finally flips to the bottom. This not only improves the safety of the workers but also extends the service life of the transport vehicle 6. This invention does not specifically limit the transport vehicle 6; existing technology can be used. However, to facilitate height adjustment for receiving materials, a steel slag transport vehicle or dump truck equipped with a lifting platform or scissor lift mechanism is preferred.

[0042] To enable remote operation of the device, a PLC control system 1 is set up and electrically connected to the reaction system, the gas supply system, the pre-humidification system, and the unloading system, respectively, to control the coordinated operation of the pre-humidification system, the reaction system, the gas supply system, and the unloading system. The PLC control system 1 of this invention mainly includes a signal acquisition module, an execution control module, and a communication module. The signal acquisition module includes an analog input module and a digital input module. The former is used to connect to temperature sensors, humidity sensors, and pressure gauges to acquire temperature, humidity, and pressure signals in real time; the latter is used to receive signals from the opening and closing status feedback of material gate one and material gate two, as well as signals from the pressure relief valve. The execution control module includes a digital output module and an analog output module. The former is used to control the start, stop, and forward / reverse rotation of the drive motor of the rotating device (a three-phase motor can be controlled by a relay), drive the electromagnetic locks of material gate one and material gate two (e.g., controlled by a DC24V pulse signal), and control the opening and closing of the pressure relief valve (e.g., electromagnetic valve on / off signal); the latter is used to adjust the frequency converter of the pressurization pump and control the heating power of the steam generator. The communication module can connect to the lifting device controller of the material handling vehicle via PROFIBUS-DP bus to transmit lifting height commands, and communicate with the HMI (Human-Machine Interface) via RS485 interface to realize parameter setting and status display. Furthermore, the PLC control system adopts a modular design, including a CPU315-2D main control unit (or other type of industrial computer), an SM331 analog input module, an SM322 digital output module, and a CP341 communication processor, connected to the ET200M distributed I / O station via PROFIBUS-DP. Its control program is written in SCL language and includes a material tracking algorithm module, interacting with the host computer via the OPCUA protocol.

[0043] The above-mentioned PLC control systems are all existing technologies well known to those skilled in the art, and will not be elaborated further here. In addition, besides the components, modules or control methods mentioned above, other technical means that can realize automated remote control can also be used, and are not limited here, as long as they can achieve the above functions.

[0044] The working principle of this utility model is explained below using 1t large-diameter steel slag as an example, along with specific parameters:

[0045] 1 ton of steel slag is loaded into the pre-wetting cylinder 15, and then 70L of water is injected for stirring. After the mixture is evenly mixed, the premix is ​​poured into the reaction cylinder 10. The PLC control system is started, and the pressurization pump 2 is used to introduce a mixture of carbon dioxide and water vapor into the reaction cylinder 10 at a rate of 12L / min. The reaction cylinder is rotated counterclockwise or clockwise at a rate of 10r / min. After the reaction has been going on for 1 hour, the reaction cylinder 10 is rotated so that the discharge port is slowly tilted toward the unloading platform 17. During this time, the modified steel slag in the reaction cylinder 10 slides into the transport vehicle 6 from the slope. Finally, the discharge port of the reaction cylinder 10 is rotated to the bottom and aligned with the transport vehicle 6, thus completing the dumping of the steel slag. Finally, the transport vehicle transports the steel slag away for sale.

[0046] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A rapid modification device for large-particle-size steel slag, characterized in that, include: The reaction system includes a reaction cylinder (10) and a rotating device (8). The rotating device (8) is set on a flat ground by a fixed bracket (7). The reaction cylinder (10) is movably connected to the rotating device (8). The circumferential side wall of the reaction cylinder (10) is provided with a material inlet (11), and an air inlet pipe (4) is provided on one of its end side walls. A material gate is provided at the material inlet (11). Several sets of spirally distributed guide plates (18) are provided on the inner wall of the reaction cylinder. The guide plates (18) form an angle of 55°-65° with the axis of the reaction cylinder (10). The gas supply system includes a steam generator (3), a carbon dioxide delivery device and a booster pump (2). The steam outlet of the steam generator (3) and the gas outlet of the carbon dioxide delivery device are both connected to the inlet of the booster pump (2). The outlet of the booster pump (2) is connected to the air inlet pipe (4).

2. The rapid modification device for large-particle-size steel slag according to claim 1, characterized in that, It also includes a pre-humidification system, which includes a pre-humidification cylinder (15) and a pre-humidification support (13). The pre-humidification cylinder (15) is connected to the pre-humidification support (13) via a connecting shaft (14), and the bottom of the pre-humidification cylinder (15) is higher than the top of the reaction cylinder (10). The top side wall of the pre-humidification cylinder (15) is provided with a second material inlet, and the second material inlet is provided with a second material gate.

3. The rapid modification device for large-particle-size steel slag according to claim 2, characterized in that, It also includes a discharge system, which includes a discharge platform (17) and a transport vehicle (6). The discharge platform (17) is located between the reaction system and the pre-wetting system. The discharge platform (17) has a ramp with the slope facing the side of the reaction cylinder (10). The bottom end of the ramp is the discharge end and is lower than the bottom end of the reaction cylinder (10). The transport vehicle (6) is located at the discharge end of the discharge platform and is below the reaction cylinder (10).

4. The apparatus for rapidly modifying large-sized steel slag according to claim 3, wherein The material transport vehicle (6) is equipped with a lifting device.

5. The rapid modification device for large-particle-size steel slag according to claim 1, characterized in that, The rotating device (8) includes a first gear, a second gear and a drive motor. The reaction cylinder (10) has end shafts at both ends. The other end of the end shaft is fixed to the fixed bracket (7) by a bearing. The first gear is fixed to the end shaft, and the second gear is fixed to the output shaft of the drive motor and meshes with the first gear.

6. The rapid modification device for large-particle-size steel slag according to claim 1, characterized in that, The reaction cylinder (10) is provided with an insulation layer (19) on the outside.

7. The rapid modification device for large-particle-size steel slag according to claim 1, characterized in that, The air inlet pipe is located at the midpoint of the end side wall of the reaction cylinder (10), and the air inlet end of the air inlet pipe is provided with a rotary joint (5).

8. The rapid modification device for large-particle-size steel slag according to claim 2, characterized in that, It also includes a PLC control system (1), which is electrically connected to the reaction system, the gas supply system and the prehumidification system respectively, and controls the coordinated operation of the reaction system, the prehumidification system and the gas supply system.

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