Continuous aluminum water filtering and automatic slag cleaning device and implementation method

Abstract

The application discloses a continuous aluminum liquid fine filtering and automatic slag cleaning device and an implementation method, and belongs to the technical field of aluminum processing. The continuous aluminum liquid fine filtering and automatic slag cleaning device comprises a filter tank and a slag cleaning frame, symmetric slag collecting grooves are arranged on the two sides of the filter tank, the filter tank is arranged obliquely, one end of the filter tank at a low position is provided with a screw conveyor, one end of the filter tank close to the screw conveyor is provided with the slag cleaning frame, and a scraper assembly reciprocally moving along the filter tank is arranged on the slag cleaning frame. The ceramic filter disc built-in the device can perform deep and fine filtering on the aluminum liquid, the periodical automatic slag cleaning mechanism can clean the filter residue accumulated on the surface of the filter disc in time, the filtering resistance can be kept at a relatively stable and low level all the time, the problems of filtering flow attenuation and later filtering effect decline caused by filter hole blockage are avoided, and therefore the purity of the output aluminum liquid is consistent from the beginning to the end of production.

Description

Technical Field

[0001] This invention relates to the field of aluminum processing technology, specifically to a continuous aluminum molten metal filtration and automatic slag removal device and its implementation method. Background Technology

[0002] Aluminum molten metal purification is a crucial step in aluminum alloy casting production, and filtration technology is one of the most direct and effective means of removing inclusions. Existing equipment is mostly static filtration, meaning the filter residue accumulated on the filter surface cannot be removed during operation. Manual cleaning after shutdown is labor-intensive, in a harsh working environment, and the process is tedious, making it difficult to completely remove the viscous filter residue. This is especially problematic when processing high-purity aluminum, aluminum foil billets, and high-end aluminum alloy sheets, where even minute residues can have a fatal impact on product performance.

[0003] Chinese patent CN119979900B discloses a device for melting and removing impurities from raw materials used in aluminum rod production. In this device, the scraper can only remove slag floating on the surface of the molten aluminum, and the slag adhering to the scraper surface affects the scraping effect, making it unsuitable for processing high-purity aluminum. Summary of the Invention

[0004] The purpose of this invention is to provide a continuous aluminum molten metal fine filtration and automatic slag removal device and implementation method. The device can perform deep and fine filtration of aluminum molten metal through the built-in ceramic filter. The periodic automatic slag removal mechanism can remove the filter residue accumulated on the surface of the filter in a timely manner, so that the filtration resistance is always kept at a relatively stable and low level. This avoids the problems of filtration flow rate reduction and subsequent filtration effect decline caused by filter hole blockage. Thus, it ensures that the purity of the output aluminum molten metal is consistent from the beginning to the end of production, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a continuous aluminum molten metal fine filtration and automatic slag removal device, including a filter tank and a slag removal frame. Slag collection tanks are symmetrically arranged on both sides of the filter tank. The filter tank is inclined and a screw conveyor is arranged at the lower end of the filter tank. A slag removal frame is arranged at the end of the filter tank near the screw conveyor. A scraper assembly that moves back and forth along the filter tank is arranged on the slag removal frame.

[0006] The filter tank is equipped with ceramic filter plates, which are inclined and the side of the ceramic filter plates closest to the screw conveyor is lower. The screw conveyor is also inclined and its lower end is connected to the filter tank. A first slag inlet is opened at the corner of the filter tank and is connected to the screw conveyor. A second slag inlet is opened on the side wall of the screw conveyor near the slag collection tank. A slag outlet is provided at the upper end of the screw conveyor.

[0007] Preferably, the slag cleaning frame is provided with a first guide rod, a scraper assembly is movably connected to the first guide rod, a drive motor is provided on the slag cleaning frame, a rotating frame is provided at the output end of the drive motor, a telescopic rod is movably connected to the rotating frame, and one end of the telescopic rod is movably connected to the scraper assembly.

[0008] Preferably, a limiting block is fixedly connected to one end of the telescopic rod near the scraper assembly, and a support spring is sleeved on the telescopic rod on one side of the limiting block, with the two ends of the support spring abutting against the limiting block and the rotating frame, respectively.

[0009] Preferably, the scraper assembly includes a movable sleeve, a second guide rod, a third guide rod, a first scraper, and a second scraper. The movable sleeve is sleeved with the first guide rod, one side of the movable sleeve is fixedly connected to the second guide rod, the third guide rod is arranged parallel to the lower part of the second guide rod, and the upper end of the first scraper is fixedly connected to the third guide rod.

[0010] Preferably, the first scraper is connected to the second scraper by multiple connecting rods of different lengths, so that the second scraper is inclined and its lower surface is used to contact the surface of the ceramic filter.

[0011] Preferably, the lower end of the first scraper is provided with a convex edge extending to one side.

[0012] Preferably, the scraper assembly further includes a slider, the upper end of which is movably connected to the limiting block via a rotating shaft, the slider having a sliding hole matching the second guide rod, the lower end of which is provided with a push plate, the push plate being sleeved with the third guide rod, and the lower end of the push plate being fitted against the side wall of the first scraper.

[0013] Preferably, both ends of the slag collection trough are provided with extension grooves, and the height of the side wall of the slag collection trough near the moving path of the first scraper is lower than that of the other side walls.

[0014] Preferably, the filter tank has an inlet at the end away from the slag removal frame, and the inlet is located on the side where the ceramic filter is higher. The filter tank has an outlet at the end away from the inlet, and the outlet is located below the ceramic filter.

[0015] Another technical problem to be solved by the present invention is to provide a method for implementing a continuous aluminum molten metal fine filtration and automatic slag removal device, comprising the following steps:

[0016] Aluminum molten metal injection and filtration: The aluminum molten metal is continuously injected into the filter tank from the inlet, flows through the inclined ceramic filter plate for filtration, and the clean aluminum molten metal flows out from the outlet.

[0017] Start cleaning: The drive motor starts, and the scraper assembly is driven to reciprocate along the first guide rod through the rotating frame and telescopic rod;

[0018] Synchronous slag scraping: When the scraper assembly moves, its first scraper scrapes the floating slag on the surface of the aluminum liquid into the slag collection tank, and its second scraper scrapes the filter slag on the surface of the ceramic filter and makes it gather towards the first slag inlet.

[0019] Self-cleaning: When the first scraper moves to the slag collection tank area, the slider moves along the second guide rod, driving the push plate to scrape off the slag adhering to the side of the first scraper;

[0020] Slag conveying: The filter residue collected at the first slag inlet and the floating slag entering through the second slag inlet are conveyed upward by a screw conveyor, achieving solid-liquid separation in the process, and finally the dry residue is discharged from the slag outlet.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention utilizes a built-in ceramic filter to perform deep and fine filtration of molten aluminum. A periodic automatic slag removal mechanism promptly removes slag accumulated on the filter surface, maintaining filtration resistance at a relatively stable and low level. This avoids the problems of reduced filtration flow and decreased filtration efficiency caused by filter pore blockage, ensuring consistent purity of the output molten aluminum from start to finish. It is particularly suitable for high-purity aluminum processing where extremely stringent impurity content requirements exist. Furthermore, the drive motor, rotating frame, telescopic rod, and scraper assembly enable simultaneous scraping and collection of surface slag and filter slag on both the molten aluminum and the filter surface. The inclined design of the filter and scraper, combined with their movement direction, utilizes gravity to automatically collect slag, resulting in high slag removal efficiency. When the scraper reaches the slag collection tank, a pusher automatically scrapes off any residue adhering to it, effectively preventing the scraper from becoming clogged and failing, ensuring long-term stable operation of the slag removal components and thorough slag removal. The slag removal process is completed automatically inside the device, without interrupting the injection of molten aluminum or the extraction of clean molten aluminum. This greatly improves equipment utilization and production efficiency, and is perfectly compatible with advanced production processes such as continuous casting and continuous casting and rolling. Attached Figure Description

[0023] Figure 1 This is an overall structural diagram of the continuous aluminum molten metal filtration and automatic slag removal device of the present invention;

[0024] Figure 2 This is a structural diagram of the filter tank of the present invention;

[0025] Figure 3 This is a top view of the filter tank of the present invention;

[0026] Figure 4 This is a side view of the filter tank of the present invention;

[0027] Figure 5 This is a diagram of the internal structure of the filter tank of the present invention;

[0028] Figure 6This is a structural diagram of the slag removal frame of the present invention;

[0029] Figure 7 This is a structural diagram of the scraper assembly of the present invention;

[0030] Figure 8 This is a structural diagram of the slider of the present invention.

[0031] In the diagram: 1. Filter tank; 11. Slag collection tank; 111. Extension tank; 12. Screw conveyor; 121. First slag inlet; 122. Second slag inlet; 123. Slag outlet; 13. Ceramic filter plate; 14. Liquid inlet; 15. Liquid outlet; 2. Slag cleaning frame; 21. First guide rod; 22. Drive motor; 23. Rotating frame; 24. Telescopic rod; 241. Limiting block; 242. Support spring; 25. Scraper assembly; 251. Movable sleeve; 252. Second guide rod; 253. Third guide rod; 254. First scraper; 2541. Protruding edge; 255. Connecting rod; 256. Second scraper; 257. Sliding block; 2571. Rotating shaft; 2572. Sliding hole; 2573. Push plate. Detailed Implementation

[0032] 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.

[0033] To address the problems of existing static filtration systems where filter cake accumulates on the filter surface and cannot be removed during operation, resulting in labor-intensive, harsh working conditions, and cumbersome cleaning processes after shutdown that fail to completely remove the sticky filter cake, please refer to [link to relevant documentation]. Figures 1-8 This embodiment provides the following technical solution:

[0034] A continuous aluminum molten metal fine filtration and automatic slag removal device includes a filter tank 1 and a slag removal frame 2. Slag collection tanks 11 are symmetrically arranged on both sides of the filter tank 1. The filter tank 1 is inclined and a screw conveyor 12 is arranged at the lower end of the filter tank 1. The slag removal frame 2 is arranged at the end of the filter tank 1 closest to the screw conveyor 12. A scraper assembly 25 that moves back and forth along the filter tank 1 is arranged on the slag removal frame 2.

[0035] Specifically, a ceramic filter plate 13 is installed inside the filter tank 1. The ceramic filter plate 13 is inclined and the side of the ceramic filter plate 13 closest to the screw conveyor 12 is lower. The screw conveyor 12 is also inclined and its lower end is connected to the filter tank 1. The bottom of the screw conveyor 12 is flush with the ceramic filter plate 13. A first slag inlet 121 connected to the screw conveyor 12 is opened at the corner of the filter tank 1. After the slag on the ceramic filter plate 13 is scraped off, it slides down the surface of the ceramic filter plate 13 and automatically collects on the side of the ceramic filter plate 13 with the lower position. The slag is then transported out of the filter tank 1 by the screw conveyor 12.

[0036] More specifically, the filter tank 1 is provided with an inlet 14 at the end away from the slag removal frame 2. The inlet 14 is located on the higher side of the ceramic filter plate 13. When aluminum molten material is continuously filtered, aluminum molten material is continuously supplied from the inlet 14. When the aluminum molten material flows in the filter tank 1, it can also impact the slag on the ceramic filter plate 13, accelerating the slag to gather on the lower side of the ceramic filter plate 13. The filter tank 1 is provided with an outlet 15 at the end away from the inlet 14. The outlet 15 is located below the ceramic filter plate 13 and discharges the aluminum molten material that has passed through the ceramic filter plate 13.

[0037] It should be noted that the screw conveyor 12 has a second slag inlet 122 near the slag collection tank 11. The slag in the slag collection tank 11 enters the screw conveyor 12 through the second slag inlet 122 and is then sent out of the slag collection tank 11 by the screw conveyor 12. The upper end of the screw conveyor 12 is provided with a slag outlet 123. The slag on the slag collection tank 11 and the ceramic filter 13 are discharged through the slag outlet 123. When the screw conveyor 12 conveys the slag upward, the molten aluminum flows downward, achieving solid-liquid separation and preventing the molten aluminum from being carried out.

[0038] The lower end of the slag cleaning frame 2 is connected to the filter tank 1. A first guide rod 21 is provided on the slag cleaning frame 2. A scraper assembly 25 is movably connected to the first guide rod 21. An extension plate is provided in the middle position of the slag cleaning frame 2. A drive motor 22 is provided at one end of the extension plate. A rotating frame 23 is provided at the output end of the drive motor 22. A movable hole is provided on the rotating frame 23. A telescopic rod 24 is movably connected in the movable hole. One end of the telescopic rod 24 is movably connected to the scraper assembly 25.

[0039] Furthermore, the slag cleaning frame 2 is provided with limit plates at both ends. The limit plates are fixedly connected to the ends of the slag collection trough 11. The limit plates are used to install the first guide rod 21. The scraper assembly 25 moves back and forth along the first guide rod 21. When the drive motor 22 is working, it drives the rotating frame 23 to rotate. The rotating frame 23 drives the telescopic rod 24 connected to it to rotate synchronously. The end of the telescopic rod 24 near the scraper assembly 25 is fixedly connected to the limit block 241. A support spring 242 is sleeved on the telescopic rod 24 on one side of the limit block 241. The two ends of the support spring 242 abut against the limit block 241 and the rotating frame 23 respectively. The support spring 242 adapts to the position change of the telescopic rod 24.

[0040] It should be noted that the scraper assembly 25 includes a movable sleeve 251, a second guide rod 252, a third guide rod 253, a first scraper 254, a connecting rod 255, a second scraper 256, and a slider 257. The movable sleeve 251 is sleeved with the first guide rod 252, and one side of the movable sleeve 251 is fixedly connected to the second guide rod 252. The third guide rod 253 is arranged parallel to the lower part of the second guide rod 252, and both ends of the third guide rod 253 are connected to the movable sleeve 251 and the second guide rod 252, respectively. The upper end of the first scraper 254 is fixedly connected to the third guide rod 253, and the first scraper 254 follows the second guide rod 254. 52 moves back and forth along the first guide rod 21 to scrape off the floating slag on the surface of the molten aluminum. The first scraper 254 is connected to the second scraper 256 through the connecting rod 255. There are no less than three connecting rods 255, and the lengths of the connecting rods 255 are different, so that the second scraper 256 is set at an angle. The lower surface of the second scraper 256 moves along the surface of the ceramic filter 13 to scrape off the slag on the surface of the ceramic filter 13. In addition, the ceramic filter 13 is set at an angle, and the scraped slag gathers on the side of the ceramic filter 13 with the lower position. The reciprocating movement of the second scraper 256 pushes the slag to the lower end of the screw conveyor 12.

[0041] In addition, a rotating shaft 2571 is fixedly connected to the upper end of the slider 257. The rotating shaft 2571 is movably connected to the limiting block 241. When the telescopic rod 24 rotates, it drives the slider 257 to move on the second guide rod 252. The rotating shaft 2571 is used to adapt to the change in the relative angle between the slider 257 and the limiting block 241 when the slider 257 moves. A sliding hole 2572 matching the second guide rod 252 is opened on the slider 257. A push plate 2573 is provided at the lower end of the slider 257. The push plate 2573 is sleeved with the third guide rod 253, and the push plate The lower end of 2573 moves against the side wall of the first scraper 254. When the first scraper 254 moves to the position of the slag collection trough 11, the telescopic rod 24 rotates continuously, controlling the slider 257 to move along the second guide rod 252 to scrape off the slag adhering to the first scraper 254 and collect it at the end of the slag collection trough 11. Therefore, both ends of the slag collection trough 111 are provided with extension grooves 111. The extension grooves 111 and the side wall of the slag collection trough 11 near the first scraper 254 are lower than other side walls, which makes it easier for the slag to be scraped off from the molten aluminum and enter the slag collection trough 11.

[0042] It should be noted that the lower end of the first scraper 254 is provided with a protruding edge 2541. When the first scraper 254 moves, the protruding edge 2541 is located below the molten aluminum, which restricts the lower position of the slag and can scrape off as much slag as possible, preventing the slag from moving downwards into the molten aluminum.

[0043] To better illustrate the implementation process of a continuous aluminum molten metal filtration and automatic slag removal device, this embodiment proposes an implementation method for such a device, comprising the following steps:

[0044] Aluminum molten metal injection: High-temperature aluminum molten metal is continuously injected into the filter tank 1 from the inlet 14 located at one end of the filter tank 1 under external pumping or static pressure. The injected aluminum molten metal is located on the higher side of the ceramic filter plate 13. Since both the filter tank 1 and the ceramic filter plate 13 are inclined, the aluminum molten metal naturally and smoothly overflows and flows over the inclined ceramic filter plate 13 surface under its own gravity.

[0045] Deep filtration: When molten aluminum flows through the fine pores of the ceramic filter 13, the non-metallic inclusions such as oxides and flux particles contained therein are efficiently trapped and adsorbed on the outer surface and internal pores of the filter. The clean molten aluminum then penetrates the filter and collects at the bottom of the filter tank 1. After the filtered clean aluminum liquid collects at the bottom of the filter tank 1, it continuously flows out from the outlet 15 located below the ceramic filter 13 and is guided to the subsequent casting or pouring process, thus achieving uninterrupted continuous filtration.

[0046] Start cleaning: Drive motor 22 starts, driving rotating frame 23 to rotate. Rotating frame 23 pushes slider 257 through telescopic rod 24 and limit block 241 in its movable hole. Since slider 257 is sleeved on second guide rod 252 through sliding hole 2572, rotational motion is converted into linear motion, driving the entire scraper assembly 25 to move back and forth along first guide rod 21.

[0047] Surface slag removal: During the movement, the lower protruding edge 2541 of the first scraper 254 is submerged below the surface of the molten aluminum. As the first scraper 254 moves, it effectively scrapes the floating slag on the surface of the molten aluminum into the slag collection tanks 11 on both sides of the filter tank 1.

[0048] Filter surface cleaning: At the same time, a second scraper 256 connected to the first scraper 254 via connecting rods 255 of different lengths moves with its lower surface close to the inclined ceramic filter 13. The second scraper 256 scrapes off the filter residue attached to the surface of the ceramic filter 13 and uses the potential energy of the inclination to push the scraped residue towards the first slag inlet 121 at the bottom of the screw conveyor 12 at the lowest point of the filter.

[0049] Self-cleaning function: When the first scraper 254 moves to the slag collection trough 11 area, the telescopic rod 24 continues to rotate, pushing the slider 257 to move along the second guide rod 252. The push plate 2573 at the lower end of the slider 257 moves accordingly, scraping off the slag adhering to the side of the first scraper 254 and letting it fall into the extension groove 111 at the end of the slag collection trough 11, preventing the scraper itself from being stuck by slag and failing.

[0050] Slag conveying and solid-liquid separation: The filter slag collected at the first slag inlet 121 at the lower end of the screw conveyor 12, and the floating slag entering from the slag collection tank 11 through the second slag inlet 122, are captured by the rotating screw blades. The screw conveyor 12 tilts upward to convey the slag. During this process, the molten aluminum mixed in the slag will flow back downward under the action of gravity, realizing solid-liquid separation and avoiding the waste of a large amount of molten aluminum. The dried slag is conveyed to the slag outlet 123 at the upper end of the screw conveyor 12 and discharged by the discharge device for collection and treatment.

[0051] 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.

[0052] 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.

Claims

1. A continuous aluminum molten metal filtration and automatic slag removal device, comprising a filter tank (1) and a slag removal frame (2), characterized in that, The filter tank (1) is symmetrically provided with slag collection tanks (11) on both sides. The filter tank (1) is inclined, and a screw conveyor (12) is provided at the lower end of the filter tank (1). A slag cleaning frame (2) is provided at the end of the filter tank (1) near the screw conveyor (12). A scraper assembly (25) that moves back and forth along the filter tank (1) is provided on the slag cleaning frame (2). A ceramic filter plate (13) is provided inside the filter tank (1). The ceramic filter plate (13) is inclined, and the ceramic filter plate (13) is inclined at both ends. The filter element (13) is positioned low on the side near the screw conveyor (12). The screw conveyor (12) is inclined and its lower end is connected to the filter tank (1). A first slag inlet (121) connected to the screw conveyor (12) is provided at the corner of the filter tank (1). A second slag inlet (122) is provided on the side wall of the screw conveyor (12) near the slag collection tank (11). A slag outlet (123) is provided at the upper end of the screw conveyor (12). The scraper assembly (25) includes a movable sleeve (251), a second guide rod (252), a third guide rod (253), a first scraper (254), and a second scraper (256). The movable sleeve (251) is sleeved with the first guide rod (21). One side of the movable sleeve (251) is fixedly connected to the second guide rod (252). The third guide rod (253) is arranged parallel to the lower part of the second guide rod (252). The upper end of the first scraper (254) is fixedly connected to the third guide rod (253). The first scraper (254) is connected to the second scraper (256) through multiple connecting rods (255) of different lengths, so that the second scraper (256) is inclined and its lower surface is used to contact the surface of the ceramic filter (13). The scraper assembly (25) also includes a slider (257). The upper end of the slider (257) is movably connected to the limiting block (241) via a rotating shaft (2571). The slider (257) has a sliding hole (2572) that matches the second guide rod (252). The lower end of the slider (257) is provided with a push plate (2573). The push plate (2573) is sleeved with the third guide rod (253), and the lower end of the push plate (2573) is attached to the side wall of the first scraper (254).

2. The continuous aluminum molten metal filtration and automatic slag removal device according to claim 1, characterized in that, The slag cleaning frame (2) is provided with a first guide rod (21), and a scraper assembly (25) is movably connected to the first guide rod (21). The slag cleaning frame (2) is provided with a drive motor (22), and a rotating frame (23) is provided at the output end of the drive motor (22). A telescopic rod (24) is movably connected to the rotating frame (23), and one end of the telescopic rod (24) is movably connected to the scraper assembly (25).

3. The continuous aluminum molten metal filtration and automatic slag removal device according to claim 2, characterized in that, The telescopic rod (24) is fixedly connected to a limiting block (241) at one end near the scraper assembly (25). A support spring (242) is sleeved on the telescopic rod (24) on one side of the limiting block (241). The two ends of the support spring (242) abut against the limiting block (241) and the rotating frame (23) respectively.

4. The continuous aluminum molten metal filtration and automatic slag removal device according to claim 3, characterized in that, The lower end of the first scraper (254) is provided with a protruding edge (2541) extending to one side.

5. The continuous aluminum molten metal filtration and automatic slag removal device according to claim 4, characterized in that, Both ends of the slag collection trough (11) are provided with extension grooves (111), and the height of the side wall of the slag collection trough (11) near the moving path of the first scraper (254) is lower than that of the other side walls.

6. The continuous aluminum molten metal filtration and automatic slag removal device according to claim 5, characterized in that, The filter tank (1) is provided with an inlet (14) at the end away from the slag removal frame (2). The inlet (14) is located on the side of the ceramic filter (13) that is higher. The filter tank (1) is provided with an outlet (15) at the end away from the inlet (14). The outlet (15) is located below the ceramic filter (13).

7. A method for implementing the continuous aluminum molten metal filtration and automatic slag removal device as described in claim 6, characterized in that, The process includes the following steps: Aluminum molten metal injection and filtration: Molten aluminum is continuously injected into the filter tank (1) from the inlet (14), flows through the inclined ceramic filter (13) for filtration, and the cleaned molten aluminum flows out from the outlet (15); Slag removal is initiated: The drive motor (22) is started, and the scraper assembly (25) is driven to move back and forth along the first guide rod (21) through the rotating frame (23) and the telescopic rod (24); Synchronous slag scraping: When the scraper assembly (25) moves, its first scraper (254) scrapes the slag on the surface of the molten aluminum into the slag collection tank (11), and its second scraper (256) scrapes the slag from the ceramic filter. The filter residue on the surface of the filter plate (13) is collected and gathered at the first slag inlet (121); self-cleaning: when the first scraper (254) moves to the area of ​​the slag collection trough (11), the slider (257) moves along the second guide rod (252) and drives the push plate (2573) to scrape off the slag adhering to the side of the first scraper (254); slag conveying: the filter residue collected at the first slag inlet (121) and the floating slag entering through the second slag inlet (122) are conveyed upward by the screw conveyor (12), and solid-liquid separation is achieved in this process. Finally, the dry slag is discharged from the slag outlet (123).

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