A high-efficiency treatment method and device for multiphase steel slag

Abstract

The present invention provides a highly efficient method and apparatus for processing multiphase steel slag. According to the present invention, with the assistance of a slag pot tilting mechanism, a storage bin is tilted between the front of the drum and the feed chute 4 to serve as a buffer transition, eliminating the need for a slag skimmer. This method and apparatus achieve the goals of fully automated, continuous, efficient, and automated slag processing. They can process high-flowing, high-temperature molten slag as well as highly viscous slag adhered to the slag pot walls and non-flowing solid slag, particularly large, bulky bottom slag. While meeting automated operating requirements, they also reduce safety hazards and errors associated with manual operation.

Description

Technical Field

[0001] The present invention relates to a metallurgical slag treatment method and device, and in particular to a multi-phase high-temperature steel slag high-efficiency drum treatment method and device. Background Art

[0002] Steel slag is one of the major by-products produced during the steel production process, accounting for about 10-30% of crude steel production. Steel slag is a complex mixture mainly composed of metal oxides such as calcium, magnesium, silicon, aluminum, and iron, non-metallic oxides of phosphorus and sulfur, and various high-melting-point polymers. It is also doped with 1-10% metallic iron of varying particle sizes. The temperature of the freshly fired steel slag is as high as 1500°C, and most of it is in a molten state with a certain degree of fluidity. However, as the temperature drops, the viscosity of the steel slag increases rapidly and a large amount of heat is released. Due to differences in steelmaking processes among steel mills, the composition and temperature of the slag produced during the smelting process vary. Some high-temperature slag is highly fluid and can be poured like water; others are less fluid and difficult to pour easily from the slag pot (the container for storing and transporting high-temperature slag, also known as a slag ladle), requiring mechanical force or inversion. To extend the life of the slag pot and prevent the high-temperature slag from eroding the bottom of the pot during injection, a portion of cold slag is placed at the bottom of the empty slag pot when receiving slag from the converter. When the high-temperature slag is injected, this cold slag mixes with the hot slag in contact and, together with the slag on the inner wall of the slag pot, forms a large slag mass, weighing several tons or even more than ten tons, accounting for approximately one-quarter to one-half of the total slag volume. This slag mass is also known as the bottom slag. The complexity of slag composition and the diversity of its morphology pose significant challenges to its handling and subsequent utilization.

[0003] The most common slag treatment process is hot pouring + post-processing, which involves pouring the high-temperature slag into a slag treatment site for natural cooling. The cooled slag is then crushed, magnetically separated, and graded. The recovered cold steel is returned to the production process, and the sorted tailings are reused or sold to the public based on particle size and performance. Slag, a silicate material, has poor thermal conductivity and an extremely slow natural cooling rate. To improve the cooling efficiency of slag and reduce the cooling area, slag treatment workshops often use mechanical shoveling and cooling water spraying. Dust and waste steam are pervasive, creating a harsh working environment. Dust levels in the surrounding area exceed standards, and even explosions can occur if care is not taken. With increasingly stringent environmental protection requirements, the development of short, fast, safe, and environmentally friendly processes for treating high-temperature slag has become a pressing need for steel companies. The drum-type slag treatment technology developed by a steel company emerged against this backdrop. It's a new, closed, rapid, and resource-efficient slag hot treatment technology. It achieves dynamic, continuous, and rapid cooling and crushing of high-temperature metallurgical slag into granular finished slag with a particle size of less than 50 mm within a sealed container. The dust-laden exhaust gas generated during the process is collected and purified by a flue before being discharged through a chimney to meet standards. This revolutionizes the chaotic emissions of other treatment processes, enabling wastewater recycling and zero emissions. This process is not only short-term and investment-saving, but also easy to operate, safe, and reliable. The treated slag can be directly recycled as a resource. Consequently, the technology has been recognized by the industry since its introduction, and the process technology and equipment have been continuously improved and rapidly developed with industrial implementation and commercialization. However, so far, due to the limitations of technological development, the conventional drum process can only process steel slag with good fluidity on a single device. Even with the assistance of the slag pot tilting mechanism and the slag scraper, only part of the viscous solid steel slag can be quantitatively scraped into the drum. The efficiency is low and the processing cycle is long. Large pieces of slag at the bottom of the pot often need to be poured on the ground or backflowed, and the efficiency of slag feeding using the slag scraper is low.

[0004] Chinese patents CN200420107540.1 and CN200810207918.8 propose an "inclined drum method for metallurgical slag treatment" and an "inclined drum method for high-temperature slag treatment process and device." These primarily involve the drum's main structure and the fact that slag with a certain fluidity is rapidly cooled, crushed, and transported to the outside of the device in sequence using multiple media within the drum. However, this type of drum is unable to process solid slag that lacks fluidity, especially large lumps of tank bottom slag.

[0005] CN201210159321.7 discloses a "full-drum steel slag treatment process and slag cleaning device." This method uses a slag loosening mechanism to loosen slag stuck to the slag tank wall or bottom, and then uses a slag scraping mechanism to remove the loosened small pieces of steel slag. This method is not only inefficient in treating highly sticky slag or slag at the bottom of the tank, but also makes it difficult to clean the highly sticky slag stuck to the slag tank wall.

[0006] Document 201510365716.6 discloses a complete drum-type steel slag processing system and process. The system primarily consists of a tilting device and slag skimmer for auxiliary feeding, a drum for core slag processing, a finished product conveyor, a vibrating separator, a bucket elevator, an online magnetic separator, a storage device, a dust removal system, a water system, and an electrical control system. This system reduces vehicle occupancy rates, enables online separation and preliminary magnetic separation of drum-processed steel slag, and allows for storage in high-level silos, avoiding environmental pollution caused by secondary or even multiple loading and unloading of finished slag.

[0007] Both of the above patents require a slag removal device, which reduces efficiency. Furthermore, during the canning operation, a large amount of hot slag simultaneously flows into the drum processing chamber and onto the steel balls, causing a large amount of hot slag to accumulate instantly, which is prone to explosion and prevents continuous operation.

[0008] The ideal drum slag treatment process and equipment should not only be reliable, safe, and environmentally friendly, but also have the characteristics of low investment and operating costs. Such process technology will involve continuous treatment technology of high-temperature steel slag, full slag coverage of the same drum (which can handle both high-temperature molten slag with good fluidity and highly viscous slag adhered to the slag pot wall and non-fluid solid slag, especially large lumps of tank bottom slag), and continuity. At the same time, it should also meet the requirements of automated operation to reduce safety hazards and errors caused by manual operation. Summary of the Invention

[0009] In order to overcome the above problems, the purpose of the present invention is to provide a high-efficiency method and device for processing multi-phase steel slag. The processing method and processing device achieve the goals of full quantification, continuity, high efficiency and automation of steel slag processing. They can not only process high-temperature molten slag with good fluidity, but also safely process highly viscous slag adhered to the slag tank wall and solid slag without fluidity, especially large-scale tank bottom slag, while meeting the requirements of automated operation and reducing safety hazards and errors caused by manual operation.

[0010] According to the present invention, with the assistance of a slag pot tilting mechanism, a storage bin positioned obliquely between the front of the drum and the feed chute 4 serves as a buffer transition, eliminating the need for a slag skimmer. This allows for safe and environmentally friendly drum processing of various types of steel slag, achieving processing efficiency more than double that of conventional drums. The continuous operation of the drum minimizes temperature fluctuations, resulting in a long service life and low maintenance costs. Furthermore, the inclusion of a mechanical cold steel cleaning device further reduces drum downtime and improves the efficiency of drum slag processing.

[0011] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0012] A method for efficiently processing multiphase steel slag, wherein the steel slag is multiphase high-temperature steel slag, including steel slag with good fluidity and steel slag with poor fluidity, highly viscous slag or solid slag, and the method sequentially comprises the following steps:

[0013] Steel slag feeding - steel slag drum treatment - tail gas emission and purification - cooling water circulation and cold steel cleaning, characterized by:

[0014] 1. Steel slag feeding;

[0015] The slag pot filled with multi-phase high-temperature steel slag is held tightly and moved to the slag feeding position by the slag pot tilting mechanism. The high-temperature steel slag with good fluidity in the slag pot 2 is controllably poured into the storage bin which is tilted between the front of the drum and the feed chute 4 and rotates continuously with the drum by the tilting slag pot 2 at a set tilting speed. The high-temperature steel slag is rapidly cooled and solidified on the inner wall of the storage bin. Under the action of gravity, it is gradually peeled off from the inner wall of the storage bin as the storage bin rotates, and it is controllably slid down and moved into the rotating drum along the tilting direction of the storage bin for drum processing.

[0016] 2. Buckle the can;

[0017] When the remaining high-viscosity slag or solid slag in the slag pot cannot flow out due to low fluidity, the slag pot is tilted further to buckle all the steel slag in the pot into the funnel of the inclined feed chute 4. The high-viscosity slag or solid slag slides into the rotating storage bin through the feed chute funnel under the action of gravity. As the drum and the storage bin rotate, under the combined action of gravity and the inclination of the storage bin, the slag slowly slides into the drum for drum processing. The speed at which the high-viscosity slag or solid slag slides into the drum is determined by the drum.

[0018] 3. Reset the tilting device;

[0019] After the can is buckled, the tilting device resets and takes over the next slag can. During this process, the drum does not stop and is in a continuous operation state.

[0020] 4. Slag cleaning machine

[0021] When there is steel slag accumulation or adhesion in the feed chute, the slag cleaning machine installed above the chute will clean it mechanically to ensure the smooth flow of the feed chute;

[0022] 5. Cleaning steel with steel cleaning machine;

[0023] When a large number of large pieces of cold steel accumulate in the drum, the machine is stopped for a short time, the feed chute including the feed funnel is removed, and the steel cleaning machine is started. The large pieces of cold steel are quickly removed from the drum through the storage bin by operating the mechanical arm of the steel cleaning machine and the electromagnet at its end.

[0024] In the past, a storage barrel was installed at the rear of the drum, but this barrel was used to collect the steel slag after the steel balls were cooled and crushed, and then discharged to the slag chute using a lifting plate. The storage bin of the present invention is arranged in front of the drum's steel ball processing chamber. It is mainly used to receive the large amount of steel slag that flows into the drum during the tank closing process, and prevents the high-temperature steel slag from accumulating in the drum processing chamber and on the steel balls, which may cause explosion. In other words, the storage bin of the present invention plays a safety and buffer role.

[0025] Different from the past, according to the present invention, the steel slag is not scraped into the storage bin through the funnel, but slides in by gravity.

[0026] The high-efficiency processing method for multi-phase steel slag according to the present invention is characterized in that the storage bin has an inclination angle of 0-25° to the horizontal plane, preferably 8-12°, and is consolidated with the drum. The volume of the storage bin is 2-3 times the volume of the slag pot to accommodate all the slag in the slag pot, so as to prevent high-temperature steel slag from accumulating in the drum processing chamber and on the steel balls and exploding. The steel slag in the storage bin slowly slides into the drum as the drum rotates, slowly contacts the steel balls, and is carried away by the steel balls and cooled and crushed.

[0027] Since the inclination angle of the storage bin is generally only about 10°, the slag in the storage bin slides into the drum slowly, slowly contacts the steel balls, and is carried away by the steel balls and cooled and crushed.

[0028] According to the present invention, the storage bin is cylindrical or conical, one end of which matches the size of the lower opening of the funnel chute, and the two form a loose mechanical seal, and the other end is fixed to the flange of the processing chamber of the drum and is coaxial with the axis of the drum, with an inclination angle of 0°-25°, preferably 8-12°, and is used to gradually send the high-temperature steel slag coming down the funnel into the processing chamber of the drum as the drum rotates, and the axis of the drum has an inclination angle relative to the horizontal plane.

[0029] In addition, according to the present invention, a reinforcing rib is provided on the outer circle of the storage bin, an annular cooling spray pipe is provided along the circumference of the outer side of the rib, the spray pipe is evenly arranged along the axial direction of the storage bin, an outer cover shell is provided outside the cooling water pipe, the outer cover shell is consolidated with the foundation, and the spray water of the cooling water pipe is collected and discharged, and the cooling water pipe is fixed on the cover shell.

[0030] The high-efficiency treatment method for multi-phase steel slag according to the present invention is characterized in that a waterwheel-type water skimming chamber is provided in the slag discharge area of ​​the outer cylinder of the drum to ensure that there is no water accumulation during the treatment process. The chambers are evenly arranged along the circumference of the outer cylinder, and the angle of the partition between the chambers coincides with the opening angle of the slag receiving funnel.

[0031] According to the present invention, the steel cleaning machine is provided with a swinging, traveling and mechanical arm telescopic mechanism, and an electromagnet is arranged at the end of the mechanical arm.

[0032] The storage bin has an inclination angle of 0-25° to the horizontal plane, preferably 8-12°, and is consolidated with the drum. The volume of the storage bin is 2-3 times the volume of the slag pot to accommodate all the slag in the slag pot and prevent high-temperature slag from accumulating in the drum processing chamber and on the steel balls and causing explosion. The slag in the storage bin enters the drum slowly as the drum rotates, slowly contacts the steel balls, and is carried away by the steel balls and cooled and crushed.

[0033] According to the high-efficiency treatment method of multi-phase steel slag of the present invention, it is characterized in that the inner wall of the storage bin is a water-cooled wall, which has a cooling and solidifying effect on the slag, and under the cooperation of gravity and rotation, the cooled large slag and the inner wall of the storage bin are peeled off, the storage bin is a cylindrical or conical open cylinder, one end of which forms a gap fit with the lower opening of the funnel chute 4, and the other end is connected to the processing chamber of the drum and is coaxial with the axis of the drum. A reinforcing rib plate is provided on the outer circle of the storage bin, and an annular cooling spray pipe is provided along the circumference of the outer side of the rib plate. The spray pipe is evenly arranged along the axial direction of the storage bin, and an outer cover shell is provided outside the cooling water pipe. The outer cover shell is consolidated with the foundation, and the spray water of the cooling water pipe is collected and discharged, and the cooling water pipe is fixed on the cover shell.

[0034] Preferably, the specific structure of the water-cooled wall of the inner wall of the storage bin is that annular cooling spray pipes are arranged along the circumference of the outer wall of the storage bin, and the spray pipes are evenly arranged along the axial direction of the storage bin.

[0035] The high-efficiency processing method for multi-phase steel slag according to the present invention is characterized in that the feed funnel is arranged on a steel structure platform, the size and shape of the upper edge are consistent with the size of the slag tank mouth, and the lower edge forms a gap fit with the end opening of the storage bin.

[0036] The high-efficiency processing method for multi-phase steel slag according to the present invention is characterized in that, in order to facilitate replacement and maintenance, the upper and lower parts of the funnel are detachably connected, the connection form adopts a flange or plug-in structure, the chute inclination angle ranges from 30° to 70°, and the optimal value is 45° to 60°.

[0037] Preferably, the lower half of the funnel that is subjected to the scouring of hot slag is provided with a water cooling device, and the feed chute 4 adopts an outer side water cooling method, a water jacket or a coil structure, and the chute wall is cooled by a water cooling mechanism 10.

[0038] According to the present invention, the material receiving area at the upper part of the funnel adopts a trumpet structure with a circular arc transition, and the chute at the lower slag receiving area adopts a water-cooling structure, and the cross section of the chute is an ellipse with a smooth transition.

[0039] "The lower edge matches the size of the opening at the end of the storage bin." For example, the lower edge of the funnel chute is circular, forming a clearance fit with the port of the storage bin.

[0040] The method includes drum processing of steel slag. The drum 8 is a double-layer, multi-cavity structure, which contains various cooling media such as steel balls and process cooling water. The high-temperature steel slag entering the drum can be subjected to ball cooling, crushing, water spray cooling and water immersion cooling in sequence. The tailings after cooling and crushing are discharged from the drum in batches as the drum rotates and enter the subsequent conveying device.

[0041] The multi-phase slag high-efficiency processing device according to the present invention comprises, in sequence: a slag feeding device - a slag processing drum - an exhaust gas discharge and purification device - a cooling water circulation device and a cold steel cleaning device, and is characterized in that:

[0042] The slag feeding device includes:

[0043] The slag feeding device includes a slag pot tilting device 1 and a water-cooled feeding chute 4 in front of it. The slag pot tilting device can move forward and backward along a horizontal track under the drive of a hydraulic mechanism to adjust the horizontal position of the slag pot opening from the feeding chute 4.

[0044] The slag pot tilting device 1 has two hydraulically driven pot holding arms that can rotate by 0-180 degrees to lift and control the rotation of the slag pot 2 so that the slag 3 in the slag pot 2 can be poured out or deducted in a controlled manner;

[0045] The storage bin 7 is provided between the water-cooled feed chute 4 and the drum 8.

[0046] The storage bin 7 is a cylindrical or conical open cylinder, one end of which forms a clearance fit with the lower opening of the funnel chute 4, and the other end is connected to the processing chamber of the drum and is coaxial with the drum axis. A reinforcing rib is provided on the outer circle of the storage bin, and an annular cooling spray pipe is provided along the circumference of the outer side of the rib. The spray pipe is evenly arranged along the axial direction of the storage bin. An outer cover shell is provided outside the cooling water pipe, the outer cover shell is consolidated with the foundation, and the spray water of the cooling water pipe is collected and discharged. The cooling water pipe is fixed on the cover shell.

[0047] According to the multiphase steel slag processing device described in the present invention, it is characterized in that the water-cooled feeding chute 4 is larger at the top and smaller at the bottom, the size and shape of the upper edge are consistent with the size of the slag tank mouth, and the lower edge forms a clearance fit with the inlet end of the storage bin 7.

[0048] According to the multiphase slag processing device of the present invention, the characteristic is that the axis of the drum 8 has an inclined angle B relative to the horizontal plane, and the inclined angle B ranges from 0° to 25°, with the optimal value recommended being 5° to 15°.

[0049] According to the multiphase slag processing device of the present invention, it is characterized in that the joint between the storage bin 7 and the drum 8 is a flange structure, which is fixed by bolts and pins.

[0050] According to the multiphase steel slag processing device described in the present invention, it is characterized in that a waterwheel-type water skimming chamber is provided in the slag discharge area of ​​the outer cylinder of the drum to ensure that there is no water accumulation during the processing process. The chambers are evenly arranged along the circumference of the outer cylinder, and the angle of the partition between the chambers is consistent with the opening angle of the slag receiving funnel.

[0051] According to the multi-phase steel slag processing device of the present invention, it is characterized in that the joint between the storage bin 7 and the drum 8 is a flange structure, which is fixed by bolts and pins.

[0052] Therefore, it is both firm and convenient for replacement and maintenance.

[0053] According to the present invention, the outer wall of the storage bin 7 is provided with a grid-shaped reinforcement rib to increase the rigidity and strength of the storage bin and increase the heat dissipation area.

[0054] According to the multiphase slag processing device of the present invention, the material receiving area at the upper part of the funnel adopts a trumpet structure with arc transition, the chute at the lower slag receiving area adopts a water-cooling structure, and the cross section of the chute is a smoothly transitioned ellipse.

[0055] According to the multiphase steel slag processing device described in the present invention, it is characterized in that the storage bin has an inclination angle of 5-15° to the horizontal plane, preferably 8-12°, and is consolidated with the drum. The volume of the storage bin is 2-3 times the volume of the slag pot to accommodate all the slag in the slag pot.

[0056] According to the present invention, a steel cleaning machine is further included to quickly remove large pieces of cold steel from the drum.

[0057] The method includes drum processing of steel slag. The drum 8 is a double-layer, multi-cavity structure, which contains various cooling media such as steel balls and process cooling water. The high-temperature steel slag entering the drum can be subjected to ball cooling, crushing, water spray cooling and water immersion cooling in sequence. The tailings after cooling and crushing are discharged from the drum in batches as the drum rotates and enter the subsequent conveying device.

[0058] According to the present invention, the supporting rollers of the above-mentioned rollers are arranged on a common base with a positioning function.

[0059] According to the present invention, the cooling water circulation system of the drum adopts the form of a machine-side vortex water well, which is conical, with a circulating water pump on the top and a slag discharge spiral device on the bottom.

[0060] According to the present invention, with the assistance of a slag pot tilting mechanism, a storage bin positioned obliquely between the front of the drum and the feed chute 4 serves as a buffer transition, eliminating the need for a slag skimmer. This allows for safe and environmentally friendly drum processing of various types of steel slag, achieving processing efficiency more than double that of conventional drums. Furthermore, the continuous operation of the drum minimizes temperature fluctuations, resulting in a long service life and low maintenance costs. Furthermore, the inclusion of a mechanical cold steel cleaning device further reduces drum downtime and improves the efficiency of drum slag processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 This is a process flow chart of the drum method suitable for full-scale steel slag treatment according to the present invention.

[0062] Figure 2-1 This is a structural diagram of the storage silo.

[0063] Figure 2-2 for Figure 2-1 D-direction view.

[0064] Figure 3 It is a partial cross-sectional diagram of the drum.

[0065] Figure 4 for Figure 3 BB direction schematic diagram.

[0066] In the figure: 1 slag pot tilting device, 2 slag pot, 3 steel slag (molten slag and solid steel slag), 4 feeding chute, 5 feeding chute fixing bracket, 6 slag cleaning machine, 7 storage bin, 7-1 reinforcement device, 7-2 connecting flange, 7-3 fastening hole, 8 roller, 8-1 bamboo strips, 8-2 steel balls, 8-3 waterwheel skimming chamber partition, 8-4 support plate, 8-5 discharge chute, 8-6 waterwheel skimming chamber, 9 steel cleaning machine, 10 feeding chute water cooling mechanism, 11 cold steel trolley, 12 front support roller device, 13 with A common base with positioning function, 14 a transmission mechanism, 15 a rear support roller device, 16 a gas collecting hood, 17 a dust removal tower, 18 an exhaust gas purification device, 19 a fan, 20 a chimney, 21 a combined conveyor, 22 a first vibrating screen, 23 a slag-steel trolley, 24 a bucket elevator, 25 a second vibrating screen, 26 an iron remover, 27 a temporary slag bin, 28 a temporary slag-steel bin, 29 a truck, 30 a machine-side cyclone pool, 31 a spiral slag discharge mechanism, 32 a circulating water pump, 33 a storage bin spray cooling mechanism, and 34 a cooling water collecting device. DETAILED DESCRIPTION

[0067] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0068] A high-efficiency multi-phase steel slag processing device is suitable for the drum method of treating full-scale steel slag, including a slag pot tilting device 1, a feed chute 4, a storage bin 7, a storage bin cooling system, a drum, a granular slag conveying and storage system, an exhaust gas emission and purification system, a cooling water circulation system, a slag cleaning mechanism 6 and a cold steel cleaning mechanism, etc. These systems organically constitute a complete drum method of treating full-scale steelmaking slag.

[0069] The slag pot tilting device 1 is arranged on the upper side of the feed chute 4 of the drum 8, and can move forward and backward along the horizontal track under the drive of the hydraulic mechanism to adjust the horizontal position of the slag pot mouth from the feed chute 4; the slag pot tilting mechanism 1 has two pot holding arms rotating under hydraulic drive, which can hold up the slag pot 2 and control the rotation of the slag pot 2, with a rotation angle of 0-180 degrees, so as to facilitate the controlled pouring or deduction of the slag 3 in the slag pot 2.

[0070] The drum 8 is equipped with a gas collecting cover 16, a front supporting roller assembly 12, a rear supporting roller assembly 15, a transmission mechanism 14, a common base 13 with a positioning function, and other mechanisms and components. The axis of the drum 8 is tilted at an angle B relative to the horizontal plane. The tilt angle B ranges from 0° to 25°, with an optimal value of 5° to 15° being recommended.

[0071] The feed chute 4 is arranged on a steel structure platform 5 and can directly transfer the impact force of the steel slag to the foundation. The feed chute 4 is a straight-through cavity structure, larger at the top and smaller at the bottom. The size and shape of the upper edge match the size of the slag tank mouth, and the lower edge matches the size of the end opening of the storage bin 7, forming a loose dynamic fit. The feed chute 4 adopts an external side water cooling method, a water jacket or coil structure, and the cooling of the chute wall is achieved by a water cooling mechanism 10. The horizontal inclination angle A of the side wall of the feed chute 4 ranges from 30° to 70°, and the optimal value is 45° to 60°.

[0072] The storage bin 7 is a cylindrical or conical open cylinder with a single-layer or multi-layer composite structure. One end of the storage bin 7 matches the lower opening size of the feed chute 4, forming a loose dynamic fit for receiving the high-temperature steel slag conveyed from the feed chute 4. The other end is fixed and coaxial with the drum 8, and is used to gradually feed the high-temperature steel slag into the processing chamber of the drum 8 as the drum rotates. The inner wall of the storage bin 7 is a smooth cylindrical or conical structure, and the joint with the drum 8 is a flange structure, fixed by bolts and pins, which is both strong and convenient for replacement and maintenance. The outer wall of the storage bin 7 is provided with a grid-like reinforcement rib to increase the rigidity and strength of the storage bin and increase the heat dissipation area.

[0073] The drum 8 is a double-layer, multi-cavity structure, which contains a variety of cooling media such as steel balls and process cooling water. It can perform ball cooling, crushing, water spray cooling and water immersion cooling on the high-temperature steel slag entering it in sequence. The tailings after cooling and crushing are discharged from the drum in batches as the drum rotates and enter the subsequent conveying device.

[0074] The front supporting roller assembly 12, consisting of two sets of rollers and a roller seat, forms an "eight" shape and mates with the front support ring of the drum 8. The rear supporting roller assembly 15, consisting of two sets of rollers and a roller seat, forms an "eight" shape and mates with the rear support ring of the drum 8. The front and rear supporting roller assemblies work together to support the drum 8 and the storage bin 7 in flexible rotation along their axes. The front and rear supporting roller assemblies 12 and 15 are placed on a common base 13 and secured with a positioning device, allowing for adjustment as needed to ensure the correct drum axis angle B and ensure that each set of rollers closely mates with its corresponding support ring.

[0075] The common base 13 with positioning function is an integral steel structure platform with a certain rigidity and strength, ensuring that the front and rear supporting roller assemblies are coplanar and the supporting surface will not tilt due to foundation settlement. The common base 13 has a positioning device for the supporting roller assembly, which can easily adjust the front and rear supporting roller assemblies and facilitate their positioning.

[0076] The transmission mechanism 14 is mainly composed of a drive motor, a coupling, a reducer, a universal joint, a small gear shaft, a large gear ring and a base. The small gear shaft is flexibly suspended on the large gear ring of the drum through a towing mechanism. The flexible transmission of the drum is achieved through the universal joint and the small gear shaft suspension mechanism, ensuring that the small gear shaft and the large gear ring can mesh well and avoiding damage to the tooth surface due to drum vibration.

[0077] The granular slag conveying and storage system is mainly composed of a combined conveyor 21, a first vibrating screen 22, a slag steel trolley 23, a bucket elevator 24, a second vibrating screen 25, an iron remover 26, a temporary slag bin 27, a temporary slag steel bin 28, and a transport truck 29. The combined conveyor 21 is composed of a scale plate machine and a scraper machine. The upper scale plate machine is responsible for conveying most of the granular slag materials, and the lower scraper machine is responsible for conveying the fine granular slag materials that escape from the gaps in the scale plates. The two are consolidated together and sealed in a cover, which is simple and clean. The first vibrating screen 22 can separate the large particles of slag steel and transport them away by the slag steel trolley 23, thereby improving resource utilization efficiency and preventing the impact and obstruction of large particles of slag steel on subsequent equipment. It can also deliver the preliminarily screened slag materials more evenly into the bucket elevator 24. The second vibrating screen 25 and the iron remover 26 are responsible for screening the slag and separating the slag from the iron. They magnetically separate and screen the steel slag online and deliver it to the corresponding temporary slag bin 27 and temporary slag steel bin 28, respectively. The finished tailings in the temporary slag bin 27 and the slag steel in the temporary slag steel bin 28 are discharged at regular intervals and delivered directly to users by transport trucks 29, achieving environmentally friendly and resourceful treatment without the slag falling to the ground.

[0078] The exhaust gas emission and purification system consists of a gas collection hood 16, a dust removal tower 17, an exhaust gas purification device 18, a fan 19, and a chimney 20. The gas collection hood 16, located at the rear of the drum 8, is responsible for collecting dust- and water vapor-laden exhaust gas generated during the drum's processing of high-temperature slag. The dust removal tower 17 and exhaust gas purification device 18 are responsible for dust removal, purification, and whitening of the exhaust gas. The purified exhaust gas is then drawn in and pressurized by the fan 19 and discharged through the chimney 20 to meet emission standards.

[0079] The cooling water circulation system consists of a vortex water well 30 beside the machine, a spiral slag discharge mechanism 31, a circulating water pump 32, and corresponding pipes, display instruments, and flow control valves. The vortex water well 30 is conical in shape, with a circulating water pump 32 installed at the top and a spiral slag discharge mechanism 31 installed at the bottom. All the sewage overflowing from the drum 8 and the exhaust gas purification device 18 is collected in the vortex water well 30. After simple sedimentation and purification, it is pumped back into the drum 8 and the exhaust gas purification device 18 by the circulating water pump 32 for recycling. The circulating water pump 32 is not only responsible for supplying water to the drum 8 and the exhaust gas purification device 18, but also provides part of the circulating water for vortex stirring in the vortex water well to prevent the sedimentation and scaling of sludge on the wall of the water well. The sludge that sinks to the bottom of the vortex water well 30 is continuously discharged by the spiral slag discharge mechanism 31 installed at the bottom of the well, achieving the balance of the sludge in the circulating water system. The evaporated cooling water is replenished by the pipeline and enters the cooling water circulation system of this device from the exhaust gas purification device 18 to achieve water balance.

[0080] The slag cleaning machine 6 consists of a cleaning head, a cleaning rod, and a hydraulic drive mechanism. The cleaning head is conical, with its tail connected to the cleaning rod via a flange, thread, or bayonet, allowing for easy replacement. Driven by the hydraulic drive mechanism, the cleaning rod can flexibly extend and retract, swing forward and backward, and move left and right to clean the sidewalls of the feed chute 4.

[0081] The cold steel cleaning mechanism comprises a hydraulically controlled steel cleaning machine 9 and a cold steel trolley 11 for holding the cold steel. The cold steel cleaning machine comprises a telescopic arm, a base, an electromagnet, and a corresponding electronic control system. The telescopic arm is mounted on the base and, under the control of a hydraulic control system, can extend and retract, up and down, and swing left and right. This drives the electromagnet at the end to move large cold steel blocks from the drum to the cold steel trolley 11, thus achieving the function of mechanically cleaning the cold steel from the drum under remote control.

[0082] Example 1:

[0083] In the 300-ton converter steelmaking process of a Baosteel steel plant, slag splashing is used to protect the furnace after tapping to extend the life of the furnace lining. The slag discharge temperature is low, the fluidity is poor, or even non-fluid. Each furnace discharges about 30 tons of slag, and the slag is 33m 3 Slag tank transportation.

[0084] By adopting the above-mentioned multi-phase steel slag high-efficiency processing device, when the slag pot 2 is transported to the slag processing room, the slag pot 2 is lifted by the crane onto the tilting mechanism 1. The tilting mechanism firmly holds the slag pot 2 and fixes it on the tilting platform, moves it back and forth to the appropriate position, and prepares for the tilting slag pot to enter the slag operation.

[0085] The slag pot 2 is slowly tilted by the slag pot tilting mechanism 1, and some fluid slag is poured into the storage bin 7 serving as a buffer transition section through the feed chute 4. The slag flows into the drum 8 through the storage bin 7 as the drum rotates.

[0086] The storage bin has an inclination angle of 0-25° to the horizontal plane, preferably 8-12°, and is consolidated with the drum. The volume of the storage bin is 2-3 times the volume of the slag pot to accommodate all the slag in the slag pot and prevent high-temperature slag from accumulating in the drum processing chamber and on the steel balls and causing explosion. The slag in the storage bin enters the drum slowly as the drum rotates, slowly contacts the steel balls, and is carried away by the steel balls and cooled and crushed.

[0087] Continue to tilt the slag pot 2, gradually increasing the inclination angle of the slag pot to more than 150°. At this time, the non-fluid steel slag (high-viscosity slag and tank bottom slag) remaining in the slag pot will fall out of the slag pot piece by piece or even as a whole, rush to the feed chute 4, and then slide into the storage bin 7, without the need for a slag scraping device. After the slag pot is turned over, the slag pot tilting mechanism 1 is reset, and the slag pot 2 returns to a horizontal free state with the pot mouth facing upward. After being hoisted by a crane, it re-enters the slag receiving cycle state. The feed chute 4 has to withstand a large impact force at the moment of receiving the slag turning, and this impact force is directly unloaded to the foundation through the fixed bracket 5 supporting the feed chute.

[0088] The steel slag charged into the storage bin 7 (a small amount may be located at the bottom of the feed chute 4) continuously slides down with the rotation of the drum and the action of gravity, and enters the drum 8 in turn, where it is quickly cooled and crushed by the steel balls therein, and is sprayed and soaked by cooling water, and is discharged from the drum in the form of low-temperature (less than 100°C) granular slag that meets the requirements.

[0089] The granular slag discharged from drum 8 is lifted by combined conveyor 21 onto first vibrating screen 22. Slag with larger particle size (e.g., greater than 50 mm) is screened out and sent to slag cart 23 below. The remaining slag is evenly conveyed to the hopper of bucket elevator 24. The slag screened by first vibrating screen 22 has a grade (metal purity) of over 90%, accounting for approximately 3% of the total slag volume, and is directly returned to the steelmaking process for reuse.

[0090] The slag lifted by the bucket elevator 24 enters the second vibrating screen 25 and is magnetically separated by the magnet 26 mounted there. The steel particles and a small amount of magnetic slag in the slag are separated and sent to the temporary slag and steel silo 28 below. The remaining slag is screened by the second vibrating screen 25 and sent to the corresponding temporary slag silo 27. The materials in the temporary slag and steel silo 28 and temporary slag silo 27 are regularly transported to users by trucks 29, realizing the resource utilization of the slag.

[0091] 10-15 minutes after the drum is tilted, all the slag in the drum is processed and enters the temporary silo through the subsequent equipment. A drum of steelmaking slag is completely processed by a single drum. The drum starts to process the next drum of slag, and the processing process is repeated as above.

[0092] To clean the cold steel from the drum, the drum 8 is stopped, the feed chute 4 is removed, and the steel cleaning machine 9 is operated using a remote control. The telescopic arm extends the electromagnet from the cavity of the storage bin 7 into the drum 8, transferring large cold steel chunks one by one to the cold steel cart 11. Once the cold steel from the surface of the steel balls is cleaned, the telescopic arm of the steel cleaning machine is withdrawn, and the drum is rotated at low speed for 3-5 revolutions to expose the large cold steel chunks buried within the steel balls. The steel cleaning machine 9 is then operated again to remove these large cold steel chunks. Repeating this process several times will essentially remove all the large cold steel chunks from the drum 8. This method can clean 15 tons of large cold steel chunks in 2 hours, with a grade of over 95%, and can be directly returned to the rotary furnace for reuse.

[0093] The drum-type processing technology and processing device for treating steel slag of the present invention covers the auxiliary feeding system for treating steel slag by the drum method, the process structure of the drum body, the conveying and storage system for finished slag, the exhaust gas purification and emission system, the water circulation system and the mechanical cleaning system for large cold steel, forming a complete drum-type steel slag (including steel slag with good fluidity and solid steel slag without fluidity, such as tank bottom slag, etc.) processing technology. Several systems work together to achieve fully quantitative and controllable slag feeding, safe drum granulation, slag transportation and storage without falling to the ground, exhaust gas emission that meets standards, sewage recycling, and mechanical cleaning of large cold steel. From the pouring / buttoning of the hot high-temperature steel slag into the drum to the separation of slag and steel until the room-temperature granular slag enters the silo for temporary storage, the entire processing cycle does not exceed 5 minutes. The slag steel and finished slag can be directly sent to users for resource utilization through online separation and sorting, the exhaust gas emission meets standards, the cooling water is recycled, and there is zero emission, truly realizing the fully quantitative, short-process, safe, environmentally friendly, and resource-based treatment of steelmaking slag.

[0094] According to the present invention, the processing method and processing device achieve the goals of full quantification, continuity, high efficiency and automation of steel slag processing. It can not only process high-temperature molten slag with good fluidity, but also safely process highly viscous slag adhered to the slag tank wall and solid slag without fluidity, especially large pieces of tank bottom slag, while meeting the requirements of automated operation and reducing safety hazards and errors caused by manual operation.

[0095] According to the present invention, with the assistance of a slag pot tilting mechanism, a storage bin positioned obliquely between the front of the drum and the feed chute 4 serves as a buffer transition, eliminating the need for a slag skimmer. This allows for safe and environmentally friendly drum processing of various types of steel slag, achieving processing efficiency more than double that of conventional drums. The continuous operation of the drum minimizes temperature fluctuations, resulting in a long service life and low maintenance costs. Furthermore, the inclusion of a mechanical cold steel cleaning device further reduces drum downtime and improves the efficiency of drum slag processing.

Claims

1. A method for efficiently processing multiphase steel slag, wherein the steel slag is a multiphase high-temperature steel slag, including steel slag with good fluidity and steel slag with poor fluidity, highly viscous slag or solid slag, the method sequentially comprising the following steps: Steel slag feeding - steel slag drum treatment - tail gas emission and purification - cooling water circulation and cold steel cleaning, characterized by: Slag feeding includes the following steps:

1. Steel slag feeding; The slag pot filled with multi-phase high-temperature steel slag is held tightly and moved to the slag feeding position by the slag pot tilting mechanism. The high-temperature steel slag with good fluidity in the slag pot (2) is controlled to flow through the feed chute (4) at a set tilting speed and poured into the storage bin which is tilted and placed between the front of the drum and the feed chute (4) and rotates continuously with the drum. The high-temperature steel slag is rapidly cooled and solidified on the inner wall of the storage bin. Under the action of gravity, the high-temperature steel slag is gradually peeled off from the inner wall of the storage bin as the storage bin rotates, and is controllably slid down and moved into the rotating drum in a tilting direction of the storage bin to be drum-treated. Second, buckle the can; When the remaining high-viscosity slag or solid slag in the slag pot cannot flow out due to low fluidity, the slag pot is continuously tilted to buckle all the steel slag in the pot into the funnel of the inclined feed chute (4). The high-viscosity slag or solid slag slides into the rotating storage bin through the feed chute funnel under the action of gravity. As the drum and the storage bin rotate, under the combined action of gravity and the inclination of the storage bin, the slag slowly slides into the drum for drum processing. The speed at which the high-viscosity slag or solid slag slides into the drum is determined by the drum.

3. Reset the tilting device; After the can is buckled, the tilting device resets and takes over the next slag can. During this process, the drum does not stop and is in a continuous operation state.

4. Slag cleaning machine When there is steel slag accumulation or adhesion in the feed chute, the slag cleaning machine installed above the chute will clean it mechanically to ensure the smooth flow of the feed chute; 5. Cleaning steel with steel cleaning machine; When there are many large pieces of cold steel accumulated in the drum, the machine is stopped for a short time, the feed chute including the feed funnel is removed, and the steel cleaning machine is started. By operating the mechanical arm of the steel cleaning machine and the electromagnet at its end, the large pieces of cold steel are quickly removed from the drum through the storage bin. The volume of the storage bin is 2-3 times the volume of the slag pot to accommodate all the slag in the slag pot and avoid the high-temperature steel slag from accumulating in the drum processing cavity and on the steel balls and exploding.

2. The high-efficiency processing method for multiphase steel slag according to claim 1, characterized in that: The storage bin is tilted at an angle of 0-25° to the horizontal plane and is consolidated with the drum. The slag in the storage bin slowly slides into the drum as the drum rotates, slowly comes into contact with the steel balls, and is carried away by the steel balls and crushed by cooling.

3. The high-efficiency processing method for multiphase steel slag according to claim 2, characterized in that: The inclination angle of the storage silo to the horizontal plane is 8-12°.

4. The high-efficiency processing method for multiphase steel slag according to claim 1, characterized in that: A waterwheel-type water skimming chamber is set in the slag discharge area of ​​the drum to ensure that there is no water accumulation during the treatment process. The chambers are evenly arranged along the circumference of the outer cylinder, and the angle of the partitions between the chambers coincides with the opening angle of the slag receiving funnel.

5. The high-efficiency processing method for multiphase steel slag according to claim 1, characterized in that: The inner wall of the storage bin is a water-cooled wall, which has a cooling and solidifying effect on the slag, and under the cooperation of gravity and rotation, the cooled large slag and the inner wall of the storage bin are peeled off. The storage bin is a cylindrical or conical open cylinder, one end of which forms a clearance fit with the lower opening of the funnel chute (4), and the other end is connected to the processing chamber of the drum and is coaxial with the axis of the drum. A reinforcing rib plate is provided on the outer circle of the storage bin, and an annular cooling spray pipe is provided along the circumference of the outer side of the rib plate. The spray pipe is evenly arranged along the axial direction of the storage bin. An outer cover shell is provided outside the cooling water pipe, and the outer cover shell is consolidated with the foundation and collects and discharges the spray water of the cooling water pipe. The cooling water pipe is fixed on the cover shell.

6. The drum treatment method according to claim 1, wherein: The feeding funnel is arranged on a steel structure platform. The size and shape of the upper edge match the size of the slag tank mouth, and the lower edge forms a clearance fit with the end opening of the storage bin.

7. The drum treatment method according to claim 6, characterized in that: To facilitate replacement and maintenance, the upper and lower parts of the funnel are detachably connected, with flange or plug-in structure as the connection form, and the chute inclination angle ranges from 30° to 70°.

8. The drum treatment method according to claim 7, characterized in that: The chute inclination angle ranges from 45° to 60°.

9. The drum treatment method according to claim 7, wherein: The lower half of the funnel that is subjected to the scouring of hot slag is provided with a water cooling device. The feed chute (4) adopts a water jacket or coil structure with water cooling on the outer side, and the chute wall is cooled by the water cooling mechanism (10).

10. A multiphase steel slag processing device for use in the multiphase steel slag high-efficiency processing method according to claim 1, comprising: Slag feeding device - drum for treating slag - tail gas emission and purification device - cooling water circulation device and cold steel cleaning device, characterized by: The slag feeding device includes: The steel slag feeding device comprises a slag pot tilting device (1) and a water-cooled feeding chute (4) on its front side, wherein the slag pot tilting device can move forward and backward along a horizontal track under the drive of a hydraulic mechanism to adjust the horizontal position of the slag pot opening from the feeding chute (4); The slag pot tilting device (1) has two pot holding arms that can rotate by 0-180 degrees under hydraulic drive to hold up and control the rotation of the slag pot (2) so that the slag (3) in the slag pot (2) can be poured out or deducted in a controlled manner; The storage bin (7) is provided between the water-cooled feed chute (4) and the drum (8). The storage bin (7) is a cylindrical or conical open cylinder, one end of which forms a clearance fit with the lower opening of the funnel chute (4), and the other end is connected to the processing chamber of the drum and is coaxial with the drum axis. A reinforcing rib plate is provided on the outer circle of the storage bin, and an annular cooling spray pipe is provided along the circumference of the outer side of the rib plate. The spray pipe is evenly arranged along the axial direction of the storage bin. An outer cover shell is provided outside the cooling water pipe, and the outer cover shell is consolidated with the foundation and collects and discharges the spray water of the cooling water pipe. The cooling water pipe is fixed on the cover shell.

11. The multiphase slag processing device according to claim 10, characterized in that: The water-cooled feed chute (4) is larger at the top and smaller at the bottom, the size and shape of the upper edge match the size of the slag pot mouth, and the lower edge forms a clearance fit with the inlet end of the storage bin (7).

12. The multiphase slag processing device according to claim 10, characterized in that: The axis of the drum (8) has an inclined angle B relative to the horizontal plane, and the range of the inclined angle B is 0°-25.

13. The multiphase slag processing device according to claim 12, characterized in that: The range of the tilt angle B is 8°-12°.

14. The multiphase slag processing device according to claim 10, characterized in that: A waterwheel-type water skimming chamber is set in the slag discharge area of ​​the outer cylinder of the drum to ensure that there is no water accumulation during the treatment process. The chambers are evenly arranged along the circumference of the outer cylinder, and the angle of the partitions between the chambers coincides with the opening angle of the slag receiving funnel.

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