Deslagging device for steel slag containing iron and nickel

Abstract

The invention relates to the technical field of ferrous metallurgy slag treatment, and discloses an iron and nickel containing steel slag removing device which comprises a molten slag distributing system, a gas quenching reactor, a gas-solid thermal coupling conveying and separating system and a heat energy recycling and gas circulating system. And the core dispersing and gas quenching reactor is connected with the discharging end of the molten slag distributing system, is used for receiving and cooperatively processing molten steel slag, and comprises a rotational flow dispersing disc assembly and an annular air quenching array. According to the invention, the annular air quenching array is combined with the heat energy recovery and gas purification unit to form a closed cycle, so that sensible heat of high-temperature slag can be efficiently recovered by the gas-liquid heat exchanger and converted into available steam or hot water, and meanwhile, purified cooling gas is sent back to the reactor by the circulating fan to be reused; and gradient utilization of energy and medium circulation are achieved, and the net energy consumption and the operation cost in the treatment process are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of slag treatment technology in iron and steel metallurgy, specifically to a slag removal device for iron and nickel-containing steel slag. Background Technology

[0002] The traditional method for steel slag removal is crushing and magnetic separation. This method is a solid waste separation process based on physical crushing and magnetic differences, mainly used to recover iron and its alloy resources from cooled steel slag. The process involves first crushing large pieces of steel slag to a suitable particle size, and then using the magnetic property of iron, separating the iron-containing particles from the non-magnetic slag phase using magnetic separation equipment. This method has become the most mainstream and widely used steel slag treatment process in recent years due to its simple principle, mature equipment, and relatively low cost.

[0003] However, the existing technologies still have the following problems and shortcomings. First, in terms of granulation effect and resource recovery, it is difficult to balance efficient crushing and rapid cooling, resulting in large slag particle size, uneven distribution, or incomplete cooling. The slag has low activity and complex internal valuable metal (such as iron and nickel) occurrence states, which is not conducive to subsequent efficient magnetic separation and recovery. Second, in terms of energy utilization and operating costs, traditional methods generally neglect the recovery of a large amount of high-temperature sensible heat carried by the slag. Whether it is water spray cooling or open-circuit air cooling, the heat energy is wasted in the form of steam or hot waste gas, which not only leads to high net energy consumption in the process, but also aggravates thermal pollution. Finally, existing technologies often have serious dust and waste gas pollution. Open-circuit air quenching systems directly discharge high-temperature dusty waste gas into the atmosphere or perform simple wet dust removal, causing resource loss and environmental pollution. Summary of the Invention

[0004] In view of the shortcomings of existing iron and nickel steel slag removal devices mentioned in the background art, the present invention provides an iron and nickel steel slag removal device with the advantages of high-efficiency granulation, closed-loop heat recovery and clean production, thus solving the technical problems mentioned in the background art.

[0005] This invention provides the following technical solution: a slag removal device for iron and nickel-containing steel slag, comprising a slag feeding system, a gas quenching reactor, a gas-solid thermal coupling conveying and separation system, and a heat recovery and gas circulation system. The slag feeding system is used to guide and regulate the flow rate of molten steel slag. The core dispersion and gas quenching reactor is connected to the discharge end of the slag feeding system and is used to receive and co-process the molten steel slag. It includes a cyclone dispersion disk assembly and an annular air quenching array. The cyclone dispersion disk assembly is used to mechanically disperse the slag, and the annular air quenching array is used to gas quench, crush, and cool the dispersed slag. The gas-solid thermal coupling conveying and separation system is located downstream of the gas quenching reactor and is used to receive the slag particles and gas-solid two-phase flow after gas quenching, and to perform preliminary gas-solid separation, outputting coarse slag material and high-temperature dust-laden airflow. The heat recovery and gas circulation system is connected to the airflow outlet of the gas-solid thermal coupling conveying and separation system and is used to recover the heat energy of the high-temperature dust-laden airflow and purify the gas. Its outlet is connected to the gas source inlet of the annular air quenching array to form a gas circulation loop.

[0006] Preferably, the slag dispensing system includes a slag guiding unit and a flow regulating mechanism, wherein the flow regulating mechanism is connected to the slag guiding unit.

[0007] Preferably, the slag guiding unit includes a slag tundish, a high-temperature resistant guiding trough, and a heating and insulation sleeve disposed outside the guiding trough; the flow regulating mechanism includes a flow regulating valve disposed on the guiding trough, and an infrared monitoring sensor aligned with the discharge end of the guiding trough.

[0008] Preferably, the gas quenching reactor further includes a reaction chamber surrounding the swirling dispersion disk assembly and the annular air quenching array.

[0009] Preferably, the swirl dispersion disk assembly includes a water-cooled high-speed rotor, composite blades, a main shaft and bearing system, and a drive system. The composite blades are mounted on the water-cooled high-speed rotor, the main shaft and bearing system is used to drive the water-cooled high-speed rotor to rotate, and the drive system provides power to the main shaft and bearing system.

[0010] Preferably, the annular air-quenching array is arranged around the radial periphery of the water-cooled high-speed rotor, and includes a high-temperature resistant nozzle array, an annular pressure equalizing air chamber, and an embedded micro-spray unit. The annular pressure equalizing air chamber supplies air to the nozzle array, and the embedded micro-spray unit is disposed on the annular pressure equalizing air chamber or the nozzle array. The reaction chamber includes a columnar sealed reaction chamber, and the inner wall of the columnar sealed reaction chamber is lined with a high-temperature wear-resistant and fire-resistant lining.

[0011] Preferably, the gas-solid-thermal coupling conveying and separation system includes a conveying air ring and a primary collector. The conveying air ring is connected to the outlet of the gas quenching reactor, and the primary collector is a cyclone separator collector connected to the outlet of the conveying air ring.

[0012] Preferably, the cyclone separator primary collector includes: a cyclone separator cylinder, a coarse particle collection chamber, and an airflow outlet, wherein the coarse particle collection chamber is connected to the bottom of the cyclone separator cylinder, and the airflow outlet is located at the top of the cyclone separator cylinder.

[0013] Preferably, the heat recovery and gas circulation system includes a heat recovery unit and a gas purification unit connected to the outlet of the heat recovery unit.

[0014] Preferably, the high-efficiency heat recovery unit includes a gas-liquid heat exchanger, and the gas purification unit includes a bag filter, a circulating fan, and a gas cooling and replenishment system connected in sequence to the outlet of the high-efficiency heat recovery unit. The bag filter is provided with a micro powder collection bin at the bottom.

[0015] The present invention has the following beneficial effects: 1. This invention combines an annular air quenching array with a heat recovery and gas purification unit to form a closed loop, which enables the sensible heat of high-temperature molten slag to be efficiently recovered by a gas-liquid heat exchanger and converted into usable steam or hot water. At the same time, the purified cooling gas is sent back to the reactor by a circulating fan for reuse, realizing the cascade utilization of energy and media circulation, and significantly reducing the net energy consumption and operating costs of the processing process.

[0016] 2. This invention employs a swirl dispersion disk assembly for mechanical pre-dispersion, combined with high-speed air quenching using an annular air quenching array. This enables the molten slag to be rapidly and uniformly crushed and quenched into fine, uniformly distributed solid particles. This dual effect not only significantly improves granulation efficiency and processing capacity but also results in slag particles with a more porous internal structure and higher activity, which is beneficial for the efficient magnetic separation and recovery of valuable components such as iron and nickel.

[0017] 3. This invention constructs a multi-stage gas-solid separation and gas purification closed-loop circulation system, including cyclone separation and bag filter dust collection, enabling the entire treatment process to be completed in a closed environment. This not only enables clean production with no dust emission at the production site and improves the working environment, but also achieves near-zero emissions of exhaust gas, completely solving the dust pollution problem in traditional steel slag treatment, resulting in significant environmental benefits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the gas quenching reactor of the present invention; Figure 3 For the present invention Figure 2 A magnified view of the structure at point A in the middle.

[0019] In the diagram: 11. Slag guiding unit; 111. Slag tundish; 112. Guide channel; 12. Flow regulating mechanism; 121. Flow regulating valve; 122. Infrared monitoring sensor; 2. Gas quenching reactor; 21. Swirl dispersion disk assembly; 211. Water-cooled high-speed rotor; 212. Composite blades; 213. Main shaft and bearing system; 221. Nozzle array; 222. Annular pressure equalizing air chamber; 223. Micro-spray unit; 23. Reaction chamber; 31. Conveying air ring; 32. Primary collector; 321. Cyclone separator cylinder; 322. Coarse particle collection bin; 323. Air outlet; 4. Heat recovery and gas circulation system; 41. Heat recovery unit; 42. Gas purification unit; 421. Bag filter; 422. Micro powder collection bin; 424. Gas cooling and replenishment system. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 A slag removal device for iron- and nickel-containing steel slag is disclosed. This device mainly integrates a slag feeding system, a gas quenching reactor 2, a gas-solid-thermal coupling conveying and separation system, a heat recovery and gas circulation system 4, and necessary integrated support and control systems. Working in synergy, it achieves full-process resource utilization from high-temperature molten slag to cold slag particles, from waste heat to usable thermal energy, and from dust-laden waste gas to circulating gas.

[0022] The high-temperature molten steel slag first enters the slag distribution system. After buffering, guiding, and flow regulation, it falls into the central processing area of ​​the gas quenching reactor 2 at a controllable flow rate and shape. Inside the gas quenching reactor 2, the molten slag is first mechanically broken into fine droplets or filaments by a high-speed rotating swirl dispersion disk assembly 21. It is then instantly cooled, solidified, and further broken into solid particles by the high-speed, low-temperature airflow ejected from the outer annular air quenching array. The resulting solid slag particles and cooling gas form a gas-solid two-phase flow, which is transported and initially separated by a gas-solid thermal coupling conveying and separation system. The coarser slag particles are collected, while the high-temperature gas carrying fine dust enters the heat recovery and gas circulation system 4. In this system, the sensible heat of the high-temperature gas is efficiently recovered, the gas itself is purified and cooled, and then it is reintroduced into the annular air quenching array as a quenching medium, forming a closed gas circulation loop, significantly improving energy utilization efficiency and eliminating waste gas emissions. The operation of the entire device is monitored and automatically adjusted by an integrated support and control system.

[0023] The slag guiding unit 11 includes a slag tundish 111, a high-temperature resistant guiding channel 112 connected to it, and a heating and insulation sleeve surrounding the guiding channel 112. The slag tundish 111 serves as a primary buffer container, receiving slag from upstream. The guiding channel 112, made of refractory material, guides the slag from the slag tundish 111 to the inlet of the gas quenching reactor 2. The heating and insulation sleeve continuously heats and insulates the guiding channel 112, ensuring that the slag does not solidify and clog during flow due to temperature drops.

[0024] The flow regulation mechanism 12 works in conjunction with the molten slag guiding unit 11 to achieve precise feeding. It includes a flow regulation valve 121 mounted on the guiding channel 112 and an infrared monitoring sensor 122 aligned with the discharge port at the end of the guiding channel 112. The flow regulation valve 121 can be a high-temperature resistant gate valve, adjusting the molten slag flow rate by changing its opening degree. The infrared monitoring sensor 122 monitors the temperature and flow rate of the molten slag in real time and feeds the signal back to the central control system, thereby achieving closed-loop control of the flow regulation valve 121 and ensuring that the molten slag flow rate entering the reactor is stable and meets process requirements.

[0025] Please see Figure 3 The gas quenching reactor 2 integrates mechanical dispersion and high-speed gas quenching, mainly comprising a swirling dispersion disk assembly 21, an annular air quenching array, and a reaction chamber 23 that houses them and forms a sealed space. The reaction chamber 23 is a columnar sealed reaction chamber that completely surrounds the swirling dispersion disk assembly 21 and the annular air quenching array, forming a high-temperature reaction space isolated from the outside environment. Its inner wall is entirely lined with a high-temperature wear-resistant and refractory lining to withstand the scouring and erosion of molten slag droplets and airflow, as well as instantaneous temperatures exceeding 1500°C. This sealed structure ensures the safety and environmental friendliness of the processing and maintains a stable internal airflow field.

[0026] The function of the swirl dispersion disk assembly 21 is to perform the first mechanical crushing of the continuously flowing molten steel slag stream. It mainly includes a water-cooled high-speed rotor 211, a cup-shaped rotor made of heat-resistant alloy and internally circulated with cooling water or other cooling media, which is the core component generating high-speed rotation; composite blades 212, consisting of multiple curved-shear composite blades, are uniformly fixed at a certain angle in the middle of the water-cooled high-speed rotor 211. When the rotor rotates at high speed, the molten slag impacts the blades and is rapidly dispersed and drawn into fine slag droplets under the combined action of centrifugal force and shear force; the main shaft and bearing system 213 is a precision mechanical structure used to support and drive the rotation of the water-cooled high-speed rotor 211, and its bearings must have good heat resistance and sealing performance; the drive system is a variable frequency speed control drive system, providing power to the main shaft and bearing system 213. Through frequency conversion control, the rotor speed can be precisely adjusted to adapt to the processing needs of molten slag with different compositions and viscosities.

[0027] An annular air quenching array is arranged radially around the swirl dispersion disk assembly 21, forming an annular airflow curtain. It mainly includes a high-temperature resistant nozzle array 221, composed of multiple specially designed high-speed nozzles evenly distributed in a ring, used to convert high-pressure gas into a uniform, high-speed cooling airflow; an annular pressure equalizing chamber 222, an annular cavity connected to the gas source pipe from the heat recovery and gas circulation system 4, whose function is to receive and store circulating gas, ensuring uniform gas pressure distribution across the annular cross-section, and then stably supplying it to each nozzle; and an embedded micro-spray unit 223 integrated into the wall of the annular pressure equalizing chamber 222 or the nozzle array 221, used to precisely spray micro-atomized water into the quenching airflow. This can be used to fine-tune the cooling intensity of the airflow or, under specific processes, induce a micro-explosion effect to further refine slag particles. Among them, the high-temperature resistant nozzle array 221 is arranged in a ring around the periphery of the dispersion disk, and its spray axis points to the core area of ​​the slag droplet flow rather than intersecting it. This makes the mainstream of the slag droplet and the nozzle physical structure spatially misaligned, so that the slag droplet directly enters the high-speed gas quenching flow field, avoiding physical collision with the nozzle orifice and causing blockage. The supersonic airflow ejected from the nozzle forms a continuous and stable high-speed air curtain in front of the nozzle outlet, pointing towards the center of the reactor. The generated airflow field itself constitutes a dynamic protective barrier to avoid blockage.

[0028] Please see Figure 2 A gas-solid thermal coupling conveying and separation system is connected to the lower outlet of the gas quenching reactor 2 to process the gas-solid mixture generated by the reactor. It mainly includes a conveying air ring 31 and a primary collector 32.

[0029] The conveying air ring 31 is connected to the discharge port at the bottom of the reaction chamber 23. The dynamic pressure of the airflow smoothly transports the falling hot slag particles to the subsequent separation equipment, preventing slag particles from accumulating in the pipeline. The primary collector 32 adopts the cyclone separation principle and is directly connected to the outlet of the conveying air ring 31. It specifically includes a cyclone separator cylinder 321, the main structure of a high-efficiency cyclone separator. The gas-solid two-phase flow enters tangentially here and rotates at high speed, with coarse and heavy particles being thrown against the cylinder wall under centrifugal force. The coarse particle collection bin 322 is connected to the conical bottom of the cyclone separator cylinder 321 to collect the separated coarse slag particles. Its lower part is equipped with an airlock discharge valve to maintain system sealing during continuous discharge and prevent gas leakage. The airflow outlet 323 is located at the exhaust pipe in the center of the top of the cyclone separator cylinder 321. After primary separation, most of the coarse particles have been removed, and the gas carrying the remaining fine dust is discharged from here, entering the heat recovery and gas circulation system 4. This gas is still at a high temperature and contains a large amount of sensible heat.

[0030] The main equipment of the heat recovery unit 41 is a gas-liquid heat exchanger. High-temperature, dust-laden flue gas (approximately 500-900°C) discharged from the gas outlet 323 of the primary collector 32 enters this heat exchanger and undergoes efficient heat exchange with water in the water pipes. The water is heated to produce steam or hot water for use in the plant area, thus recovering the sensible heat of the steel slag. The gas is initially cooled, and the gas purification unit 42 is responsible for deep purification and recirculation power supply of the cooled gas. It mainly includes a bag filter 421. After the gas enters the bag filter, the fine dust particles, typically less than 10 micrometers in diameter, rich in valuable metal oxides such as iron and nickel, are captured by the filter material, resulting in deep purification of the gas. The fine powder collection bin 422, located at the bottom of the bag filter 421, is used to periodically collect the fine powder removed by pulse cleaning. This fine powder can be recycled as a high-grade metallurgical raw material. The circulating fan provides the power required for the entire gas circulation loop, overcoming system resistance and re-pressurizing the purified gas. The gas cooling and replenishment system 424 is located after the circulating fan to perform final temperature regulation of the circulating gas, ensuring that the gas temperature returning to the annular air quenching array meets the process requirements. Simultaneously, due to potential minor leaks in the system, this unit is also responsible for replenishing the circulation loop with an appropriate amount of fresh air or nitrogen to maintain system pressure balance and gas composition stability. The purified, cooled, and pressurized gas returns through pipelines to the annular equalizing air chamber 222 of the gas quenching reactor 2, re-participating in the quenching process of the molten slag, thus completing the closed-loop gas circulation.

[0031] The method of using (working principle) of this invention is as follows: In operation, high-temperature molten steel slag is injected into the slag intermediate ladle 111 of the slag distribution system for temporary storage and buffering. Subsequently, the molten slag flows into the high-temperature resistant guide channel 112 under gravity. The external heating and insulation sleeve ensures that the molten slag remains in a flowing state during transportation, preventing solidification. The flow regulation mechanism 12 starts working, and the infrared monitoring sensor 122 monitors the temperature and shape of the molten slag stream flowing out of the discharge end of the guide channel 112 in real time, and feeds the signal back to the control system, which automatically adjusts the opening of the flow regulation valve 121, thereby precisely controlling the flow rate of molten slag entering subsequent processes and achieving stable and controllable feeding.

[0032] The precisely metered stream of molten steel slag falls into the central region of the gas-quenched reactor 2 located below it. At this time, the swirling dispersion disk assembly 21 is activated, powered by a variable frequency motor, which drives the water-cooled high-speed rotor 211 to rotate at high speed through the main shaft and bearing system 213. The composite blades 212 mounted on the rotor rotate at high speed accordingly. When the molten slag stream impacts the rotating blades, it is rapidly mechanically broken up and drawn into filaments under the action of strong centrifugal and shear forces, dispersing it into a large number of fine molten slag droplets, which greatly increases the specific surface area of ​​the molten slag.

[0033] At the same time, the annular air quenching array surrounding the swirling dispersion disk assembly 21 is activated. Cooling gas from the gas circulation loop first enters the annular equalizing air chamber 222 for pressure stabilization and uniform distribution, and then is ejected at high speed through the high-temperature resistant nozzle array 221, forming a uniform and powerful annular cooling air curtain. This high-speed cold airflow comes into full contact with the aforementioned mechanically dispersed fine molten slag droplets, undergoing extremely intense forced convection heat transfer, causing the molten slag droplets to cool and solidify instantly, and further break down into fine solid particles under thermal stress. The embedded micro-spray unit 223 can spray a small amount of atomized water into the quenching airflow as needed to finely control the cooling intensity or promote slag particle refinement. The entire air quenching and dispersion process is completed within a columnar sealed reaction chamber composed of the reaction chamber 23, whose inner wall is lined with a high-temperature wear-resistant and refractory lining to protect the equipment from high-temperature corrosion.

[0034] The solid slag particles produced after gas quenching form a gas-solid two-phase flow with the heated cooling gas. Under its own gravity and the influence of the airflow, it enters the gas-solid thermal coupling conveying and separation system. The conveying air ring 31 guides and assists this gas-solid two-phase flow to the primary collector 32. The gas-solid mixture enters the cyclone separator cylinder 321 of the cyclone separator-type primary collector 32 tangentially, where it rotates at high speed. Coarse slag particles are thrown against the cylinder wall under centrifugal force and slide down the wall surface, eventually falling into the coarse particle collection bin 322 at the bottom, which can be periodically discharged through the airlock valve. The preliminarily purified high-temperature dust-laden gas is discharged from the airflow outlet 323 at the top.

[0035] Subsequently, this high-temperature, dust-laden gas enters the heat recovery and gas circulation system 4 for energy recovery and deep purification. The gas first enters the waste heat boiler of the heat recovery unit 41, where it exchanges heat with water in the heat exchanger. The gas temperature drops significantly, while the water is heated to produce steam or hot water, achieving efficient recovery of the sensible heat of the steel slag. The cooled gas then enters the gas purification unit 42. The gas first passes through a bag filter 421, where residual fine dust rich in valuable metals such as iron and nickel is captured by the filter bags and falls into the micro-powder collection bin 422 at the bottom as product recovery. The deeply purified gas is then powered by a circulating fan and reintroduced into the loop. Finally, the gas undergoes final cooling and temperature regulation through the gas cooling and replenishment system 424. After replenishing an appropriate amount of fresh gas according to the system pressure, it is transported back to the gas quenching reactor 2, providing a stable, clean, and appropriately temperatured cooling gas source for the annular pressure equalization chamber 222 of the annular air quenching array, thus forming a complete, closed-loop gas circulation loop.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A slag removal device for iron- and nickel-containing steel slag, characterized in that: The system includes a slag distribution system, a gas quenching reactor (2), a gas-solid thermal coupling conveying and separation system, and a heat recovery and gas circulation system (4). The slag distribution system is used to guide and regulate the flow rate of molten steel slag. The core dispersion and gas quenching reactor (2) is connected to the discharge end of the slag distribution system and is used to receive and co-process molten steel slag. It includes a cyclone dispersion disk assembly (21) and an annular air quenching array. The cyclone dispersion disk assembly (21) is used to mechanically disperse the slag. The annular air quenching array is used to gas quench and cool the dispersed slag. The gas-solid thermal coupling conveying and separation system is located downstream of the gas quenching reactor (2) and is used to receive the slag particles and gas-solid two-phase flow after gas quenching, and to perform preliminary gas-solid separation, outputting coarse slag material and high-temperature dust-laden airflow. The heat recovery and gas circulation system (4) is connected to the airflow outlet of the gas-solid thermal coupling conveying and separation system and is used to recover the heat energy of the high-temperature dust-laden airflow and purify the gas. Its outlet is connected to the gas source inlet of the annular air quenching array to form a gas circulation loop.

2. The slag removal device for iron- and nickel-containing steel slag according to claim 1, characterized in that: The slag feeding system includes a slag guiding unit (11) and a flow regulating mechanism (12), wherein the flow regulating mechanism (12) is connected to the slag guiding unit (11).

3. The slag removal device for iron- and nickel-containing steel slag according to claim 2, characterized in that: The slag guiding unit (11) includes a slag tundish (111), a high-temperature resistant guiding channel (112), and a heating and heat preservation sleeve disposed outside the guiding channel (112); the flow regulating mechanism (12) includes a flow regulating valve (121) disposed on the guiding channel (112), and an infrared monitoring sensor (122) aligned with the discharge end of the guiding channel (112).

4. The slag removal device for iron- and nickel-containing steel slag according to claim 1, characterized in that: The gas quenching reactor (2) also includes a reaction chamber (23) which surrounds the swirling dispersion disk assembly (21) and the annular air quenching array.

5. The slag removal device for iron- and nickel-containing steel slag according to claim 4, characterized in that: The swirling dispersion disk assembly (21) includes a water-cooled high-speed rotor (211), composite blades (212), a main shaft and bearing system (213), and a drive system. The composite blades (212) are mounted on the water-cooled high-speed rotor (211). The main shaft and bearing system (213) is used to drive the water-cooled high-speed rotor (211) to rotate. The drive system provides power to the main shaft and bearing system (213).

6. The slag removal device for iron- and nickel-containing steel slag according to claim 5, characterized in that: The annular air-quenching array is arranged around the radial periphery of the water-cooled high-speed rotor (211). It includes a high-temperature resistant nozzle array (221), an annular pressure equalizing air chamber (222), and an embedded micro-spray unit (223). The annular pressure equalizing air chamber (222) supplies air to the nozzle array (221). The embedded micro-spray unit (223) is disposed on the annular pressure equalizing air chamber (222) or the nozzle array (221). The reaction chamber (23) includes a column-type sealed reaction chamber. The inner wall of the column-type sealed reaction chamber is lined with a high-temperature wear-resistant and fire-resistant lining.

7. The slag removal device for iron- and nickel-containing steel slag according to claim 1, characterized in that: The gas-solid-thermal coupling conveying and separation system (3) includes a conveying air ring (31) and a primary collector (32). The conveying air ring (31) is connected to the outlet of the gas quenching reactor (2), and the primary collector (32) is a cyclone separator collector connected to the outlet of the conveying air ring (31).

8. The slag removal device for iron- and nickel-containing steel slag according to claim 7, characterized in that: The cyclone separator primary collector (32) includes: a cyclone separator cylinder (321), a coarse particle collection chamber (322), and an airflow outlet (323). The coarse particle collection chamber (322) is connected to the bottom of the cyclone separator cylinder (321), and the airflow outlet (323) is located at the top of the cyclone separator cylinder (321).

9. The slag removal device for iron- and nickel-containing steel slag according to claim 1, characterized in that: The heat recovery and gas circulation system (4) includes a heat recovery unit (41) and a gas purification unit (42) connected to the outlet of the heat recovery unit (41).

10. A slag removal device for iron- and nickel-containing steel slag according to claim 1, characterized in that: The high-efficiency heat recovery unit (41) includes a gas-liquid heat exchanger, and the gas purification unit (42) includes a bag filter (421), a circulating fan and a gas cooling and replenishment system (424) connected in sequence to the outlet of the high-efficiency heat recovery unit (41). The bag filter (421) is provided with a micro powder collection bin (422) at the bottom.

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