Non-ferrous smelting slag grading and recycling device

Abstract

This utility model discloses a non-ferrous metal smelting waste residue grading and recycling device, including a base plate, a defluorination unit, and a waste residue screening unit. An installation frame is welded to the left side of the top surface of the base plate, and the defluorination unit is fixed to the top surface of the installation frame. A solid-liquid separation box is welded to the side wall of the installation frame. An agitator is fixed to the inside of the defluorination unit by bolts. In this utility model, the waste residue screening unit achieves high-frequency synchronous vibration of the upper and lower screen buckets through a linkage structure of "motor, transmission rod, disc cam, and spring," completing three-stage particle size classification in one go. Compared with the existing multi-equipment combination of "cyclone separator + high-frequency screen," this significantly improves the grading efficiency. The coarse, medium, and fine slags after grading by the double-layer screen buckets can be used to extract metallic aluminum, alumina and calcium fluoride, and to produce building materials, respectively. There is no waste residue stockpiling, the solid waste utilization rate is high, and the risk of land occupation and slag leakage pollution is reduced.

Description

Technical Field

[0001] This utility model relates to the field of metal recycling technology, and in particular to a graded recycling device for non-ferrous metal smelting waste slag. Background Technology

[0002] In the non-ferrous metal smelting industry, the treatment of aluminum-containing smelting waste slag (such as aluminum electrolytic cell overhaul slag and aluminum smelting furnace slag) has always been a key focus of the industry. Such waste slag not only contains recyclable resources such as metallic aluminum and alumina, but also contains harmful components such as soluble fluorides. If not handled properly, it will not only waste resources, but also cause environmental problems such as fluorine pollution and leakage from slag stockpiles. Therefore, there is an urgent need for efficient and environmentally friendly recycling and treatment technologies.

[0003] Currently, the industry commonly employs a multi-equipment combination process of "hydrocyclone + high-frequency screen" for the classification and treatment of aluminum smelting waste slag. First, the waste slag undergoes preliminary particle size separation using a hydrocyclone. Then, the slag of different particle sizes output from the hydrocyclone is fed into a high-frequency screen for secondary screening to achieve coarse, medium, and fine slag classification. However, this process has significant drawbacks: Firstly, the hydrocyclone and high-frequency screen need to operate independently and require connecting conveyor equipment, resulting in a complex process and large equipment footprint. Furthermore, the multi-equipment linkage is prone to parameter matching issues, leading to low classification efficiency and making it difficult to achieve rapid and accurate slag classification. Secondly, this combined process cannot achieve "one-time three-stage classification," requiring staged processing, which not only prolongs the classification time but also increases equipment investment and operating energy consumption, making it economically unfeasible for small and medium-sized smelting enterprises. In addition, existing grading processes often only focus on the recovery of metallic aluminum from coarse slag, neglecting the resource utilization of alumina, calcium fluoride and fine slag in medium slag. This results in a large amount of slag being abandoned and stockpiled, which not only occupies valuable land resources, but is also prone to leakage due to rainwater runoff, causing secondary pollution to soil and groundwater. The utilization rate of solid waste is generally less than 60%, resulting in both resource waste and environmental risks. In the fluoride removal process of aluminum smelting waste, existing technologies mainly employ either the "acid-base neutralization fluoride removal method" or the "static water washing fluoride removal method." The acid-base neutralization fluoride removal method involves adding strong acid or strong base reagents to the waste residue to react with fluorides and form precipitates. Although it can remove some fluorides, the reagent addition process can easily introduce new impurity ions, and improper handling of the reaction products can easily cause secondary pollution. In addition, the purchase and storage costs of acid and base reagents are relatively high. The static water washing fluoride removal method involves mixing the waste residue with water in a certain proportion and letting it stand, relying on the natural dissolution of fluorides to achieve fluoride removal. This method does not require chemical reagents, but the contact between the waste residue and water is insufficient, resulting in low fluoride dissolution efficiency (the dissolution rate is usually less than 60%). Moreover, the washing liquid is mostly discharged directly, which not only fails to recover fluoride resources (such as generating calcium fluoride for reuse in aluminum electrolysis production), but also causes water waste and fluoride pollution in water bodies, failing to meet the environmental protection requirements of "zero discharge." Although some improved processes have attempted to add a stirring device to the static water washing process, the problem of recycling the washing liquid has not been solved. Furthermore, the waste residue particles are prone to agglomeration under stirring, and the fluoride dissolution is still insufficient, making it difficult to meet the industry's dual requirements for fluoride removal efficiency and environmental protection.

[0004] To address this issue, a non-ferrous metal smelting waste slag grading and recycling device is proposed, which has the advantages of high-efficiency grading, full slag utilization, and environmentally friendly defluorination, thereby solving the problems mentioned in the background technology. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a graded recycling device for non-ferrous metal smelting waste.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a non-ferrous metal smelting waste residue grading and recycling device, comprising a base plate, a defluorination unit, and a waste residue screening unit. A mounting frame is welded to the left side of the top surface of the base plate, and the defluorination unit is fixed to the top surface of the mounting frame. A solid-liquid separation box is welded to the side wall of the mounting frame. A stirrer is bolted to the inside of the defluorination unit, and a drain elbow is installed on the lower right side of the defluorination unit corresponding to the solid-liquid separation box. The waste residue screening unit is fixed to the right side of the top surface of the base plate. Furthermore, the waste residue screening unit has an upper screen bucket and a lower screen bucket installed sequentially from top to bottom. Contact blocks are welded to one side surface of both the upper and lower screen buckets, and springs connected to the inner wall of the waste residue screening unit are provided on the other side surface of both the upper and lower screen buckets. A motor is fixed to the lower surface of the waste residue screening unit by bolts, and a transmission rod is fixed to the output end of the motor by a coupling. Two disc-shaped cams are fixed to the surface of the transmission rod, and one end of each disc-shaped cam abuts against the contact blocks of the upper and lower screen buckets, respectively.

[0007] As a further description of the above technical solution: the left side wall of the defluorination unit is provided with circulation pipes, and a liquid pump is installed on the surface of the circulation pipes. The upper end of the circulation pipe is connected to a filter head, and the lower end of the circulation pipe is connected to a comb tube. The filter head and the comb tube are both immersed in the solution of the defluorination unit. Several branch pipes are arranged in parallel on the comb tube, and an inclined nozzle is installed at the end of each branch pipe.

[0008] As a further description of the above technical solution: the top, bottom and right sides of the waste residue screening unit are all open, and the bottom of the waste residue screening unit is symmetrically provided with support parts welded to the bottom plate.

[0009] As a further description of the above technical solution: both the upper and lower screen hoppers are inclined about the waste slag screening unit, and the bottoms of the upper and lower screen hoppers are respectively equipped with detachable screens, and the screen aperture of the upper screen hopper is larger than that of the lower screen hopper.

[0010] As a further description of the above technical solution: the solid-liquid separation box has two symmetrically welded support strips inside, and a separation filter is movably installed on the top surface of the two support strips, the separation filter being located below the drain elbow.

[0011] As a further description of the above technical solution: the side of the waste residue screening unit is provided with a clearance opening corresponding to the contact block, and the end of the contact block that passes through the clearance opening is provided with an arc-shaped recess.

[0012] As a further description of the above technical solution: the filter head is composed of a cylindrical metal shell and a filter screen embedded in its side, and the top surface of the filter head has a round hole that communicates with the circulation pipe.

[0013] This utility model has the following beneficial effects: In this invention, the waste residue screening unit achieves high-frequency synchronous vibration of the upper and lower screen buckets through a linkage structure of "motor, transmission rod, disc cam, and spring," completing three-stage particle size classification in one go. Compared with the existing multi-equipment combination of "cyclone separator + high-frequency screen," it significantly improves the classification efficiency. The coarse, medium, and fine residues after classification by the double-layer screen buckets can be used to extract metallic aluminum, alumina and calcium fluoride, and to make building materials, respectively. There is no waste residue stockpiling, the solid waste utilization rate is high, and the risk of land occupation and residue leakage pollution is reduced.

[0014] In this invention, the "stirring + circulation disturbance" design of the defluorination unit, with the stirrer mixing and circulation pipe and inclined nozzle creating reverse flow disturbance, significantly improves the soluble fluoride dissolution rate. After preliminary filtration in the solid-liquid separation tank, the washing liquid is sent to the lime slurry precipitation tank to generate calcium fluoride precipitate. The clear liquid can be recycled and reused through the circulation pipe, which avoids the secondary pollution generated by existing acid-base defluorination and realizes fluoride resource recovery, achieving zero wastewater discharge. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the non-ferrous metal smelting waste residue classification and recycling device of this utility model; Figure 2 This is a schematic diagram of the internal structure of the defluorination unit; Figure 3 This is a top view of the waste residue screening unit; Figure 4 This is a 3D diagram of the comb tube.

[0016] Legend: 1. Base plate; 2. Defluorination unit; 3. Waste residue screening unit; 4. Mounting frame; 5. Agitator; 6. Circulation pipe; 7. Drain elbow; 8. Solid-liquid separation tank; 9. Motor; 10. Transmission rod; 11. Disc cam; 12. Upper screen hopper; 13. Lower screen hopper; 14. Filter head; 15. Comb tube; 16. Support strip; 17. Separation filter hopper; 18. Liquid pump; 19. Contact block; 20. Spring; 21. Angled nozzle. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] According to an embodiment of the present invention, a graded recycling device for non-ferrous metal smelting waste slag is provided.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4As shown, the non-ferrous metal smelting waste residue grading and recycling device according to an embodiment of the present invention includes a base plate 1, a defluorination unit 2, and a waste residue screening unit 3. A mounting frame 4 is welded to the left side of the top surface of the base plate 1, and the defluorination unit 2 is fixed to the top surface of the mounting frame 4. A solid-liquid separation box 8 is welded to the side wall of the mounting frame 4. A stirrer 5 is bolted to the inside of the defluorination unit 2, and a drain elbow 7 is installed on the lower right side of the defluorination unit 2 corresponding to the solid-liquid separation box 8. The waste residue screening unit 3 is fixed to the right side of the top surface of the base plate 1, and an upper screen hopper 12 and a lower screen hopper 13 are installed sequentially from top to bottom inside the waste residue screening unit 3. One side of the upper screen hopper 12 and the lower screen hopper 13... Contact blocks 19 are welded to the surface of each unit, and springs 20 connected to the inner wall of the waste slag screening unit 3 are provided on the other side of the upper screen bucket 12 and the lower screen bucket 13. The lower surface of the waste slag screening unit 3 is fixed with a motor 9 by bolts, and the output end of the motor 9 is fixed with a transmission rod 10 by a coupling. Two disc cams 11 are fixed on the surface of the transmission rod 10, and one end of the two disc cams 11 abuts against the contact blocks 19 of the upper screen bucket 12 and the lower screen bucket 13 respectively. The unit is designed for aluminum smelting waste slag (containing soluble fluorides, metallic aluminum blocks, alumina, silicon dioxide and other components, which need to be defluorinated and reduced in harm before being graded and recycled). It includes a bottom plate 1, a defluorination unit 2 and a waste slag screening unit 3. The base plate 1 serves as the load-bearing foundation for the entire device. A mounting frame 4 is welded to the left side of its top surface. This frame not only provides stable support for the defluorination unit 2 (which is bolted to the top of the mounting frame 4 to prevent displacement due to vibration during aluminum-containing waste processing), but also has a solid-liquid separation tank 8 welded to its side wall. Considering the need for rapid separation of slag and liquid after washing the aluminum-containing waste, the solid-liquid separation tank 8 can promptly trap metallic aluminum blocks and alumina particles in the slag, preventing them from being lost with the fluorinated washing liquid. An agitator 5 is bolted to the inside of the defluorination unit 2. To ensure the complete dissolution of soluble fluorides in the aluminum-containing waste, the agitator 5 efficiently mixes the waste with water. A drain elbow 7, installed on the lower right side of the defluorination unit 2 corresponding to the solid-liquid separation tank 8, precisely guides the mixed liquid into the separation tank, preventing leakage.The waste slag screening unit 3, fixed on the right side of the top surface of the base plate 1, is primarily used to separate coarse slag (containing metallic aluminum blocks), medium slag (containing alumina), and fine slag (containing silica) from aluminum-containing waste slag. Inside, an upper screen hopper 12 and a lower screen hopper 13 are installed sequentially from top to bottom, adaptable to the particle size differences of different slag compositions. Contact blocks 19 are welded to one side of both the upper and lower screen hoppers 12 and 13, while springs 20 connected to the inner wall of the waste slag screening unit 3 are installed on the other side. These work in conjunction with a motor 9 (providing power for screening) bolted to the lower surface of the waste slag screening unit 3. A transmission rod 10, fixed to the output end of the motor 9 via a coupling, and two disc-shaped cams 11 fixed to the surface of the transmission rod 10 (one end of each disc cam 11 abuts against the contact blocks 19 of the upper and lower screen hoppers 12 and 13 respectively), can drive the screen hoppers to vibrate at high frequency through the combined action of the disc-shaped cams 11 pushing and the springs 20 resetting, ensuring efficient grading of the aluminum-containing waste slag. Please refer to Figure 1 , Figure 2 and Figure 4 The left side wall of the defluorination unit 2 is provided with a circulation pipe 6, and a liquid pump 18 is installed on the surface of the circulation pipe 6. The upper end of the circulation pipe 6 is connected to a filter head 14, and the lower end of the circulation pipe 6 is connected to a comb tube 15. Both the filter head 14 and the comb tube 15 are immersed in the solution of the defluorination unit 2. Several branch pipes are arranged in parallel on the comb tube 15, and an inclined nozzle 21 is installed at the end of each branch pipe. In order to meet the requirement of deep dissolution of soluble fluorides in aluminum waste residue, the left side wall of the defluorination unit 2 is provided with a circulation pipe 6, and the liquid pump 18 installed on the surface of the circulation pipe 6 can drive the mixed liquid to circulate and improve the defluorination efficiency. The filter head 14 connected to the upper end of the circulation pipe 6 can filter aluminum-containing waste particles (such as metal aluminum blocks and alumina fragments) in the mixed liquid, avoiding pipe blockage. The comb pipe 15 connected to the lower end of the circulation pipe 6 is immersed in the solution of the defluorination unit 2 together with the filter head 14. Several branch pipes are arranged in parallel on the comb pipe 15, and each branch pipe end is equipped with an inclined nozzle 21. The mixed liquid sprayed by the inclined nozzle 21 forms a reverse turbulent flow, which can break the agglomeration of aluminum-containing waste particles, allowing soluble fluorides to dissolve fully, solving the problem of uneven contact between waste and water in traditional water washing, and clearing the fluoride pollution obstacle for subsequent aluminum resource recovery.

[0020] Please refer to Figure 1 and Figure 3The waste slag screening unit 3 has openings on its top, bottom, and right sides, and symmetrical support parts welded to the bottom plate 1 are arranged at the bottom. Considering the need for convenient feeding of aluminum-containing waste slag and rapid collection of slag after grading, the waste slag screening unit 3 has openings on its top, bottom, and right sides: the top opening facilitates the direct feeding of aluminum-containing slag after washing; the right opening allows the graded coarse slag (containing metallic aluminum blocks) and medium slag (containing alumina) to be smoothly discharged along the inclined screen hopper; and the bottom opening facilitates the collection of fine slag (containing silica). At the same time, the symmetrical support parts welded to the bottom plate 1 at the bottom of the waste slag screening unit 3 can offset the vibration generated during the screening of aluminum-containing waste slag, prevent the device from shifting, and ensure the stability of the grading process.

[0021] Please refer to Figure 1 and Figure 4 Both the upper screen hopper 12 and the lower screen hopper 13 are inclined relative to the waste slag screening unit 3. The bottom of the upper screen hopper 12 and the lower screen hopper 13 are respectively equipped with detachable screens. The screen mesh size of the upper screen hopper 12 is larger than that of the lower screen hopper 13. Considering the particle size characteristics of different components in aluminum-containing waste slag (metallic aluminum blocks are mostly coarse particles >15mm, alumina is mostly medium particles 2-15mm, and silicon dioxide is mostly fine particles <2mm), both the upper screen hopper 12 and the lower screen hopper 13 are inclined relative to the waste slag screening unit 3. The inclined structure utilizes gravity to assist the flow of slag and improve the classification speed. The bottom of the upper screen hopper 12 and the lower screen hopper 13 are respectively equipped with detachable screens, and the screen aperture of the upper screen hopper 12 is larger than that of the lower screen hopper 13. The detachable design makes it easy to adjust the screen according to the actual particle size of the aluminum-containing waste residue. For example, when the particle size of the aluminum metal blocks is large, the upper screen with a larger aperture can be replaced to ensure accurate separation of coarse residue and provide qualified raw materials for subsequent aluminum metal recovery and alumina extraction.

[0022] Please refer to Figure 2 The solid-liquid separation tank 8 has two symmetrically welded support strips 16 inside, and a separation filter 17 is movably installed on the top surface of the two support strips 16. The separation filter 17 is located below the drain elbow 7. In order to meet the need for rapid separation of slag and liquid after washing aluminum-containing waste residue, the solid-liquid separation tank 8 has two symmetrically welded support strips 16 inside, and the separation filter 17 movably installed on the top surface of the support strips 16 is located exactly below the drain elbow 7. The separation filter 17 can intercept aluminum-containing slag (such as metallic aluminum blocks and alumina particles) in the mixed liquid, and prevent it from entering the subsequent precipitation stage with the fluoride-containing washing liquid. This ensures that the fluoride treatment is not affected by the slag, and can collect aluminum-containing slag in time to prepare for subsequent screening and recovery. At the same time, the movable separation filter 17 is easy to remove and clean, reducing the difficulty of maintenance.

[0023] Please refer to Figure 1 and Figure 3The waste slag screening unit 3 has a clearance opening on its side corresponding to the contact block 19. One end of the contact block 19 passing through the clearance opening has an arc-shaped recess. This clearance opening provides ample space for the contact block 19 to move flexibly during the aluminum-containing waste slag screening process, preventing collisions and wear with the unit's sidewalls. The arc-shaped recess at the end of the contact block 19 passing through the clearance opening reduces the contact area with the disc cam 11, lowers frictional losses, extends component life, and ensures stable synergy between the cam and the contact block 19, providing continuous power for high-frequency screening of aluminum-containing waste slag.

[0024] Please refer to Figure 2 The filter head 14 consists of a cylindrical metal shell and a filter screen embedded in its side. A circular hole connected to the circulation pipe 6 is located on the top surface of the filter head 14. Addressing the presence of solid particles (such as aluminum shavings and alumina particles) in the aluminum-containing waste residue mixture, the filter head 14 effectively intercepts these solid particles, preventing them from entering the circulation pipe 6 and causing blockages, thus ensuring the stable operation of the fluoride dissolution circulation system. The circular hole on the top surface of the filter head 14, connected to the circulation pipe 6, ensures smooth flow of the mixture into the circulation pipe 6, improving circulation efficiency and facilitating the deep dissolution of soluble fluorides from the aluminum-containing waste residue, laying the foundation for efficient subsequent aluminum resource recovery.

[0025] Working principle: In operation, aluminum smelting waste slag is first fed into defluorination unit 2 (stirring and washing tank), and clean water is added at a ratio of 1:4. Stirring is then started at room temperature using stirrer 5. Utilizing the water-soluble properties of soluble fluorides, the fluorides are dissolved from the waste slag. Simultaneously, the liquid pump 18 on the circulation pipe 6 is started, and the mixture is drawn in through filter head 14 (to prevent clogging of slag particles), and then distributed through comb tube 15 to various inclined nozzles 21, spraying out a reverse turbulent flow. This, in conjunction with stirrer 5, enhances the fluoride dissolution efficiency. After washing, the drain elbow 7 is opened, and the mixture flows into the separation filter hopper 17 in the solid-liquid separation tank 8, trapping slag and filtering fluoride-containing water. The washing liquid and slag are transferred to the subsequent screening stage. The fluoride-containing washing liquid is sent to the lime slurry sedimentation tank (10% lime slurry is added to adjust the pH to 8-9) to generate calcium fluoride precipitate. After filtration, the clear liquid is returned to the defluorination unit 2 through the circulation pipe 6 to complete the washing liquid circulation. During the multi-stage screening of waste residue, the dried slag after solid-liquid separation is fed into the waste residue screening unit 3 through the top opening. The lower motor 9 is started, which drives the two disc cams 11 to rotate through the transmission rod 10. The disc cams 11 periodically push the contact blocks 19 of the upper screen bucket 12 and the lower screen bucket 13, causing the screen buckets to shift to one side. At the same time, the spring 20 on the other side generates a restoring force, driving the screen buckets to rotate. The bucket rebounds, creating high-frequency vibration. Under this vibration, the upper screen bucket 12 (15mm aperture) traps coarse slag >15mm, which is discharged from the right-side opening along the inclined screen bucket; slag ≤15mm falls into the lower screen bucket 13 (2mm aperture), trapping medium slag 2-15mm and discharging it from the right-side opening; fine slag <2mm passes through the screen and is discharged from the bottom opening of the unit, completing the grading of coarse, medium, and fine slag in one go. This facilitates the subsequent extraction of metallic aluminum, alumina, and calcium fluoride from the coarse, medium, and fine slag, or its use as a material for building materials. (Specifically, coarse slag treatment: >15mm coarse slag (including metallic aluminum blocks) is crushed to ≤5mm, and then discharged through the screen.) Aluminum particles are separated by an eddy current separator (utilizing conductivity differences). The tailings are crushed and incorporated into the medium slag. Medium slag treatment: 2-15mm medium slag is ground to ≤0.1mm, and alumina is leached with 15% dilute sulfuric acid at room temperature. After filtration, ammonia is added to the filtrate to precipitate aluminum hydroxide, which is then dried and calcined to obtain alumina. The leaching residue is separated from calcium fluoride by an airflow separator (density difference), and the finished product is obtained after water washing. Fine slag treatment: <2mm fine slag is magnetically separated to remove iron, then mixed with cement and fly ash in a 6:2:2 ratio, pressed into brick blanks, and naturally cured for 7 days to produce non-load-bearing bricks (compressive strength ≥MU10), achieving complete slag recycling.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-ferrous metal smelting waste residue grading and recycling device, comprising a base plate (1), a defluorination unit (2), and a waste residue screening unit (3), characterized in that: A mounting frame (4) is welded to the left side of the top surface of the base plate (1), and a defluorination unit (2) is fixed to the top surface of the mounting frame (4). A solid-liquid separation box (8) is welded to the side wall of the mounting frame (4). An agitator (5) is fixed to the inside of the defluorination unit (2) by bolts. A drain elbow (7) is installed on the lower right side of the defluorination unit (2) corresponding to the solid-liquid separation box (8). A waste residue screening unit (3) is fixed to the right side of the top surface of the base plate (1), and an upper screen bucket (12) and a lower screen bucket (13) are installed inside the waste residue screening unit (3) from top to bottom. 12) and one side surface of the lower screen bucket (13) are welded with contact blocks (19), and the other side surface of the upper screen bucket (12) and the lower screen bucket (13) are provided with springs (20) connected to the inner wall of the waste slag screening unit (3). The lower surface of the waste slag screening unit (3) is fixed with a motor (9) by bolts, and the output end of the motor (9) is fixed with a transmission rod (10) by a coupling. The surface of the transmission rod (10) is fixed with two disc cams (11), and one end of the two disc cams (11) abuts against the contact blocks (19) of the upper screen bucket (12) and the lower screen bucket (13) respectively.

2. The non-ferrous metal smelting waste slag classification and recycling device according to claim 1, characterized in that: The left side wall of the defluorination unit (2) is provided with a circulation pipe (6), and a liquid pump (18) is installed on the surface of the circulation pipe (6). The upper end of the circulation pipe (6) is connected to a filter head (14), and the lower end of the circulation pipe (6) is connected to a comb tube (15). The filter head (14) and the comb tube (15) are both immersed in the solution of the defluorination unit (2). Several branch pipes are arranged in parallel on the comb tube (15), and an inclined nozzle (21) is installed at the end of each branch pipe.

3. The non-ferrous metal smelting waste slag classification and recycling device according to claim 1, characterized in that: The waste slag screening unit (3) has openings on its top, bottom and right sides, and the bottom of the waste slag screening unit (3) is symmetrically provided with support parts that are welded to the bottom plate (1).

4. The non-ferrous metal smelting waste slag classification and recycling device according to claim 1, characterized in that: The upper screen bucket (12) and the lower screen bucket (13) are both inclined about the waste residue screening unit (3), and the bottom of the upper screen bucket (12) and the lower screen bucket (13) are respectively detachably equipped with screens, and the screen aperture of the upper screen bucket (12) is larger than that of the screen aperture of the lower screen bucket (13).

5. The non-ferrous metal smelting waste slag classification and recycling device according to claim 1, characterized in that: The solid-liquid separation box (8) has two symmetrically welded support strips (16) inside, and a separation filter (17) is movably installed on the top surface of the two support strips (16). The separation filter (17) is located below the drain elbow (7).

6. The non-ferrous metal smelting waste slag classification and recycling device according to claim 1, characterized in that: The waste slag screening unit (3) has a clearance opening on the side corresponding to the contact block (19), and the end of the contact block (19) that passes through the clearance opening is provided with an arc-shaped recess.

7. The non-ferrous metal smelting waste slag classification and recycling device according to claim 2, characterized in that: The filter head (14) is composed of a cylindrical metal shell and a filter screen embedded in its side, and the top surface of the filter head (14) has a round hole that communicates with the circulation pipe (6).

Images