A solid-liquid separation device and method for red mud treatment

Abstract

This invention discloses a solid-liquid separation device and method for red mud treatment, relating to the field of solid-liquid separation technology. The invention includes a base, a sedimentation tank fixedly connected to the top of the base, an inlet pipe fixedly connected to the top of the sedimentation tank, a separation mechanism on the top of the base, a rinsing mechanism on the front of the separation mechanism, and a squeezing mechanism on the top of the base. The invention uses an external controller to start a first motor, driving a rotating shaft and a sliding plate to rotate slowly. Under the buoyancy of the float, the sliding plate and its extraction unit remain suspended on the surface of the supernatant, effectively avoiding interference from the thick sludge at the bottom. Then, a first water pump is started, and the clear supernatant is extracted and transported to a storage tank via a flexible first pipe and a first and second rotary joint that can adapt to rotation. This ensures the quality of the supernatant recovery and provides convenience for subsequent rinsing or reuse. Simultaneously, the rotary design avoids disturbance to the settling interface.

Description

Technical Field

[0001] This invention belongs to the field of solid-liquid separation technology, and in particular relates to a solid-liquid separation device and method for red mud treatment. Background Technology

[0002] Red mud is a highly alkaline solid waste discharged during the alumina industrial production process. Its output is huge, with about 1.0-2.0 tons of red mud generated for every ton of alumina produced. Red mud particles are extremely fine, have high water content, and complex composition. It is highly alkaline and poses potential environmental risks. Its large-scale stockpiling occupies a large amount of land resources.

[0003] Chinese patent CN208684740U discloses a solid-liquid separation device for treating bauxite red mud, including a solid-liquid separation tank body. A first telescopic device is fixedly installed at the bottom of the solid-liquid separation tank body by bolts, and a baffle is fixedly installed inside the solid-liquid separation tank body near the side of the extrusion sleeve. A second telescopic device is fixedly installed at one end of the fixing rod, and an upper pressure plate is provided on one side of the fixing rod near the lower part of the second telescopic device.

[0004] As shown above, this device, through the combined use of the first and second telescopic devices, can achieve rapid solid-liquid separation in sludge. Simultaneously, the heating effect of the upper and lower pressure plates allows for the compaction of the separated sludge, facilitating cleaning by staff. However, the original solid concentration of red mud slurry is typically only 20-30%, with the remaining 70-80% being water, a large portion of which consists of submicron particles. These cannot be effectively separated directly by simple mechanical filtration. Without first adding flocculants to cause agglomeration and sedimentation, direct pressure filtration will be extremely inefficient, the filter cloth will clog instantly, and the discharged water will be turbid sludge. Existing technology uses chemical flocculation, adding precipitants to separate clear water, and then using pipelines to extract the clear water. Currently, static pipes are commonly used. The continuous suction of these static pipes creates a continuous downward flow of water at the suction port, which can easily generate local vortices. This causes the mud at the bottom or around the mud to be stirred up and sucked up, resulting in turbidity and deterioration of the effluent quality. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a solid-liquid separation device and method for red mud treatment, which solves the aforementioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a solid-liquid separation device for red mud treatment, comprising a base, a sedimentation tank fixedly connected to the top of the base, a feed pipe fixedly connected to the top of the sedimentation tank, a separation mechanism provided on the top of the base, a rinsing mechanism provided on the front of the separation mechanism, and a squeezing mechanism provided on the top of the base; The separation mechanism includes a first motor fixedly connected to the bottom of the base. The output shaft of the first motor is fixedly connected to a rotating shaft via a coupling. Several sliding plates are slidably connected to the inner wall of the rotating shaft via a sliding groove. A float is fixedly connected to the outer wall of the sliding plate. A ring is fixedly connected to the outer wall of each sliding plate. A first pipe is fixedly connected to the outer wall of the ring. A first rotary joint is fixedly connected to the outer wall of the first pipe. A second rotary joint is rotatably connected to the top of the first rotary joint.

[0007] Preferably, the parts in contact with the outer walls of several sliding plates are the same, the first pipe is made of rubber material with a certain degree of flexibility, the outer wall of the first rotary joint is fixedly connected to the top of the rotating shaft, and the top of the second rotary joint is fixedly connected to the top cover of the sedimentation tank.

[0008] Preferably, a first water pump is fixedly connected to the top of the second rotary joint via a pipe, and a liquid storage tank is fixedly connected to the output end of the first water pump via a pipe. The outer wall of the liquid storage tank is fixedly connected to the outer wall of the sedimentation tank.

[0009] Preferably, the extrusion mechanism includes an extrusion box fixedly connected to the top of the base, a hydraulic actuator fixedly connected to the top of the extrusion box, an extrusion plate fixedly connected to the output end of the hydraulic actuator via a hydraulic rod, a frame fixedly connected to the inner wall of the extrusion box, a second water pump fixedly connected to the bottom of the base, the outer wall of the second water pump fixedly connected to the bottom of the sedimentation tank via a pipe, and a first flexible pipe fixedly connected to the output end of the second water pump.

[0010] Preferably, the outer wall of the first flexible pipe is slidably connected to the inner wall of the extrusion chamber, a first electric push rod is fixedly connected to the inner wall of the extrusion chamber, a clamping plate is fixedly connected to the outer wall of the first electric push rod, the outer wall of the clamping plate is fixedly connected to the outer wall of the first flexible pipe, a telescopic rod is fixedly connected to the outer wall of the extrusion chamber, and a filter plate is fixedly connected to the bottom of the telescopic rod.

[0011] Preferably, the outer wall of the filter plate is in contact with the inner wall of the frame, a spring is fixedly connected to the top of the filter plate, the telescopic rod is located inside the spring, a limiting post is fixedly connected to the top of the filter plate, a second electric push rod is fixedly connected to the outer wall of the frame, a limiting block is fixedly connected to the outer wall of the second electric push rod, the outer wall of the limiting block is slidably connected to the inner wall of the extrusion box, and the outer wall of the limiting block is engaged with the inner wall of the limiting post.

[0012] Preferably, the rinsing mechanism includes a third water pump fixedly connected to the outer wall of the extrusion chamber, the outer wall of the third water pump being fixedly connected to the inner wall of the storage tank via a pipe, a second flexible pipe being fixedly connected to the output end of the third water pump, a rinsing device being fixedly connected to the end of the second flexible pipe away from the third water pump, a second motor being fixedly connected to the outer wall of the extrusion chamber, and a lead screw being fixedly connected to the output shaft of the second motor via a coupling, the outer wall of the lead screw being threadedly connected to the inner wall of the rinsing device.

[0013] This invention also discloses a method for using a solid-liquid separation device for red mud treatment, specifically including the following steps: S1. First, after the red mud slurry and precipitant are mixed externally, they are transported to the sedimentation tank through the feed pipe. After sedimentation is completed, the first motor is started to drive the rotating shaft to rotate. S2. The rotation of the rotating shaft will drive the sliding plate and the parts on the sliding plate to rotate together. At the same time, through the cooperation of the first water pump, the second rotary joint, the first rotary joint and the first pipe, the supernatant after sedimentation is completed is extracted. S3. During the extraction process, the supernatant will be pumped into the storage tank by the first water pump for storage, so that it can be reused later. When the supernatant extraction is completed, the float will stay above the high-concentration red mud slurry, and the extraction will end at this time. S4. The second water pump transports the remaining high-concentration red mud slurry into the frame through the first flexible pipe. After the transportation is completed, the first electric push rod pushes the card plate to move away from the first flexible pipe. S5. Subsequently, the hydraulic device pushes the extrusion plate to cooperate with the frame to compress the red mud, reduce its volume and squeeze out the water. The water flows away through the filter plate. After compression, the second electric push rod is stretched, causing the limit block to disengage from the limit post, releasing the limit on the filter plate. The extrusion plate continues to move downward, driving the compressed red mud and filter plate downward. The telescopic rod and spring are stretched, and the compressed red mud is taken out from the bottom of the device. After being taken out, the extrusion plate is reset, the spring pulls the filter plate back to its position, and the second electric push rod retracts to make the limit block re-lock into the limit post, fixing the filter plate. S6. After compression, the third water pump draws liquid from the storage tank and sends it to the flusher through the second flexible pipe. The second motor starts and drives the lead screw to rotate, causing the flusher to move and clean the upper surface of the filter plate.

[0014] The present invention has the following beneficial effects: 1. The solid-liquid separation device and method for red mud treatment involves feeding slurry pre-mixed with a precipitant into a sedimentation tank through a feed pipe to complete sedimentation. After sedimentation, an external controller starts a first motor to drive a rotating shaft and a sliding plate to rotate slowly. Under the buoyancy of the float, the sliding plate and its extraction unit remain suspended on the surface of the supernatant, effectively avoiding interference from the thick sludge at the bottom. Subsequently, a first water pump is started, and the clear supernatant is smoothly extracted and transported to a storage tank through a flexible first pipe and a first and second rotary joint that can adapt to rotation. This ensures the quality of the supernatant recovery and provides convenience for subsequent rinsing or reuse. At the same time, the rotary design avoids disturbance to the sedimentation interface.

[0015] 2. The solid-liquid separation device and method for red mud treatment: After sedimentation, the high-viscosity red mud slurry is stably transported into the frame through a first flexible pipe by a second water pump using a high-pressure diaphragm pump. Subsequently, a first electric push rod pushes a clamping plate to move away from the first flexible pipe, making room for the extrusion process. Then, a hydraulic actuator drives an extrusion plate to cooperate with the frame, forcefully extruding the red mud. The water is discharged through the filter plate and the filter cloth above, achieving secondary dewatering and volume compression. After dewatering, the second electric push rod retracts, driving the limiting block to disengage from the limiting post, releasing the lock on the filter plate. The extrusion plate continues to move downward, pushing the dewatered red mud cake and the filter plate together to the bottom of the device for removal. After unloading, under the action of the spring's rebound force, the filter plate resets and re-cooperates with the frame. At the same time, the second electric push rod extends, driving the limiting block to engage with the limiting post to lock the filter plate. The device automatically resets. This process integrates high-pressure conveying, mechanical extrusion, automatic unloading, and reset functions, improving dewatering efficiency and operational continuity.

[0016] 3. The solid-liquid separation device and method for red mud treatment involves extracting the supernatant stored in the storage tank through a third water pump after the red mud compression and dewatering process is completed. The supernatant is then transported to the flusher via a second flexible pipeline. Subsequently, the second motor is started to drive the lead screw to rotate, causing the flusher to move directionally along the upper surface of the filter plate. This effectively flushes the residual red mud adhering to the surface. The system not only utilizes its own supernatant as the cleaning medium, realizing the internal circulation of alkali and water, thus saving water resources and chemical agents, but also ensures the comprehensiveness and uniformity of the flushing through the lead screw drive. This effectively restores the filtration performance of the filter plate and filter cloth, ensuring the stability and dewatering efficiency of the device's continuous operation.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the first motor structure of the present invention; Figure 3 This is a schematic diagram of the structure of the first water pump of the present invention; Figure 4 This is a schematic diagram of the second rotary joint structure of the present invention; Figure 5 This is a schematic diagram of the extrusion plate structure of the present invention; Figure 6 This is a schematic diagram of the flushing device structure of the present invention; Figure 7 This is a schematic diagram of the frame structure of the present invention; Figure 8 This is a schematic diagram of the telescopic rod structure of the present invention; Figure 9 This is a schematic diagram of the filter plate structure of the present invention; Figure 10 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0020] The attached diagram lists the components represented by each number as follows: 1. Base; 101. Sedimentation tank; 102. Feed pipe; 2. Separation mechanism; 201. First motor; 202. Rotating shaft; 203. Sliding plate; 204. Float; 205. Ring; 206. First pipe; 207. First rotary joint; 208. Second rotary joint; 209. First water pump; 210. Storage tank; 3. Extrusion mechanism; 301. Extrusion box; 302. Hydraulic unit; 303. Extrusion... 304. Plate; 305. Frame; 306. Second water pump; 307. First flexible pipe; 308. First electric push rod; 309. Clamping plate; 310. Telescopic rod; 311. Filter plate; 312. Spring; 313. Limiting post; 314. Second electric push rod; 315. Limiting block; 4. Flushing mechanism; 401. Third water pump; 402. Second flexible pipe; 403. Flushing device; 404. Second motor; 405. Lead screw. Detailed Implementation

[0021] 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.

[0022] This invention discloses a solid-liquid separation device for red mud treatment and provides the following three technical solutions: Figures 1-10 The first embodiment is shown: it includes a base 1, a sedimentation tank 101 is fixedly connected to the top of the base 1, and a feed pipe 102 is fixedly connected to the top of the sedimentation tank 101 for conveying red mud slurry pre-mixed with a precipitant into the sedimentation tank 101 for sedimentation and separation. A separation mechanism 2 is provided on the top of the base 1, a rinsing mechanism 4 is provided on the front of the separation mechanism 2, and a squeezing mechanism 3 is provided on the top of the base 1. The separation mechanism 2 includes a first motor 201 fixedly connected to the bottom of the base 1. The output shaft of the first motor 201 is fixedly connected to a rotating shaft 202 via a coupling. Several sliding plates 203 are slidably connected to the inner wall of the rotating shaft 202 via a sliding groove. Each sliding plate 203 can rotate synchronously with the rotating shaft 202 and float adaptively along the axial direction to adjust to the liquid level. A float 204 is fixedly connected to the outer wall of the sliding plate 203 to ensure that the sliding plate 203 always floats on the surface of the supernatant. The float 204 is preferably made of conventional alkali-resistant polymer materials such as alkali-resistant polypropylene and polytetrafluoroethylene. It is made of hollow sealed structure, with an effective displacement of 1-8L for a single float. The overall buoyancy of the float is 1.2-1.5 times greater than the total weight of the rotating floating supernatant extraction unit. It is suitable for supernatant level fluctuation range of 0.5-3m in sedimentation tank. The outer wall of the sliding plate 203 is fixedly connected to a ring 205. The outer wall of the ring 205 is fixedly connected to a first pipe 206 for extracting surface supernatant. The outer wall of the first pipe 206 is fixedly connected to a first rotary joint 207. The top of the first rotary joint 207 is rotatably connected to a second rotary joint 208.

[0023] Several sliding plates 203 have identical contact parts on their outer walls, forming a ring array to achieve full-area coverage of the supernatant surface for extraction. The first pipe 206 is made of rubber with a certain degree of flexibility to adapt to the displacement of the float 204 caused by fluctuations in the liquid surface. The outer wall of the first rotary joint 207 is fixedly connected to the top of the rotating shaft 202, so that the first pipe 206 can rotate synchronously with the rotating shaft 202. The top of the second rotary joint 208 is fixedly connected to the top cover of the sedimentation tank 101 to achieve a sealed connection between the rotating part and the fixed pipeline.

[0024] The top of the second rotary joint 208 is fixedly connected to the first water pump 209 via a pipe, which is used to provide suction power to lead the supernatant out through the first pipe 206 and the rotary joint. The output end of the first water pump 209 is fixedly connected to the storage tank 210 via a pipe, which is used to store the recovered supernatant for subsequent rinsing of the filter cloth or recycling. The outer wall of the storage tank 210 is fixedly connected to the outer wall of the sedimentation tank 101.

[0025] Figures 1-10 The second embodiment is shown, and the main difference from the first embodiment is that: the extrusion mechanism 3 includes an extrusion box 301 fixedly connected to the top of the base 1, a hydraulic device 302 fixedly connected to the top of the extrusion box 301, and an extrusion plate 303 fixedly connected to the output end of the hydraulic device 302 through a hydraulic rod. The extrusion plate 303 can perform high-pressure dewatering of the red mud in the frame 304 under hydraulic drive. The frame 304 is fixedly connected to the inner wall of the extrusion box 301 for containing and forming high-concentration red mud slurry. A second water pump 305 is fixedly connected to the bottom of the base 1. The outer wall of the second water pump 305 is fixedly connected to the bottom of the sedimentation tank 101 through a pipe for extracting the high-concentration red mud slurry after sedimentation from the bottom of the sedimentation tank 101. A first flexible pipe 306 is fixedly connected to the output end of the second water pump 305.

[0026] The outer wall of the first flexible pipe 306 is slidably connected to the inner wall of the extrusion box 301, allowing it to move laterally out of the extrusion station under the drive of a specific mechanism. The inner wall of the extrusion box 301 is fixedly connected to a first electric push rod 307, and the outer wall of the first electric push rod 307 is fixedly connected to a clamping plate 308, which is used to fix and drive the first flexible pipe 306 to move. The outer wall of the clamping plate 308 is fixedly connected to the outer wall of the first flexible pipe 306, realizing the controllable adjustment of the pipe position. The outer wall of the extrusion box 301 is fixedly connected to a telescopic rod 309, and the bottom of the telescopic rod 309 is fixedly connected to a filter plate 310. The filter plate 310 is used for drainage during the extrusion process and descends with the red mud cake during unloading.

[0027] The outer wall of the filter plate 310 contacts the inner wall of the frame 304 to form a sealed extrusion chamber, ensuring that the dewatering process only takes place above the filter plate 310. A spring 311 is fixedly connected to the top of the filter plate 310. The spring 311 is used to pull the filter plate 310 to automatically reset after unloading. The telescopic rod 309 is located inside the spring 311. A limit post 312 is fixedly connected to the top of the filter plate 310. A second electric push rod 313 is fixedly connected to the outer wall of the frame 304 to control the engagement and release of the limit block 314. The limit block 314 is fixedly connected to the outer wall of the second electric push rod 313. The outer wall of the limit block 314 is slidably connected to the inner wall of the extrusion chamber 301. The outer wall of the limit block 314 is engaged with the inner wall of the limit post 312, realizing the detachable locking of the filter plate 310 in the working position and ensuring extrusion stability.

[0028] Figures 1-10The third embodiment is shown, and its main difference from the first two embodiments is that the rinsing mechanism 4 includes a third water pump 401 fixedly connected to the outer wall of the extrusion box 301. The outer wall of the third water pump 401 is fixedly connected to the inner wall of the storage tank 210 through a pipe, and is used to extract the supernatant stored in the storage tank 210 as the rinsing medium. The output end of the third water pump 401 is fixedly connected to a second flexible pipe 402, which is used to transport the rinsing liquid and adapt to the movement of the rinsing device 403. Both the second flexible pipe 402 and the first flexible pipe 306 are made of polyurethane-reinforced alkali-resistant flexible tubing. After being soaked in 10% NaOH solution at room temperature for 30 days, there is no swelling, cracking, or softening, and the volume change rate is ≤±1%. Sand washing is used. The wear resistance test shows an abrasion loss of ≤200mg / 1000g, which can withstand the high-speed scouring of fine red mud particles (flow velocity ≤3m / s) and avoid wear and perforation of the inner wall of the pipe. The end of the second flexible pipe 402 away from the third water pump 401 is fixedly connected to a flusher 403, which can spray and clean the surface of the filter plate 310. The outer wall of the extrusion box 301 is fixedly connected to a second motor 404, and the output shaft of the second motor 404 is fixedly connected to a lead screw 405 through a coupling. The outer wall of the lead screw 405 is threadedly connected to the inner wall of the flusher 403, so that the second motor 404 can drive the flusher 403 to move axially along the lead screw 405, thereby achieving uniform and automated flushing of the entire surface of the filter plate 310.

[0029] This invention also discloses a method for using a solid-liquid separation device for red mud treatment, specifically including the following steps: First, the mud and precipitant are mixed externally, and then transported to the settling tank 101 through the feed pipe 102 for settling. After settling, the first motor 201 is started by the external controller to drive the rotating shaft 202 to rotate, which in turn drives the sliding plate 203 and the parts on the sliding plate 203 to rotate together. Due to the presence of the float 204, the sliding plate 203 will always float on the surface of the supernatant. At this time, the first water pump 209 is started by the external controller to extract the supernatant through the first pipe 206. After the extraction is completed, the float 204 stays above the high-concentration, high-viscosity red mud slurry below, and the extraction stops at this time. Since the first rotary joint 207 and the second rotary joint 208 are rotatably connected, the rotation of the rotating shaft 202 will not interfere with the first pipe 206. The first pipe 206 should be made of rubber and have a certain degree of flexibility. The first water pump 209 transports the extracted supernatant to the storage tank 210 for storage. The turbidity of the extracted supernatant is ≤5 NTU, which is much lower than the 30-50 NTU extracted by traditional fixed pipes. Then, the remaining high-concentration, viscous red mud slurry is transported to the inside of the frame 304 through the first flexible pipe 306 via the second water pump 305. After the transport is completed, the first electric push rod 307 is activated to push the clamping plate 308, thereby moving the first flexible pipe 306 without obstructing the extrusion plate 303. The second water pump 305 should be a high-pressure diaphragm pump, which is wear-resistant, leak-free, and capable of handling high-viscosity slurries containing solid particles, with high pressure. After the transport is completed, the hydraulic device 302 is activated to extrude the extrusion plate 303, which works in conjunction with the frame 304 to compress the red mud, reducing its volume and further compressing the internal water content. After extrusion, the red mud moisture content is ≤35%, which is 12 percentage points lower than conventional pressure filtration. The compressed water flows to the bottom of the device through the filter plate 310. A filter cloth can be added above the filter plate 310, preferably... Using alkali-resistant polytetrafluoroethylene needle-punched filter cloth with an effective mesh size of 200-400 mesh, after extrusion, the second electric push rod 313 is stretched, causing the limiting block 314 to disengage from the limiting post 312. At this time, the limiting post 312 is no longer limited. Then, the extrusion plate 303 moves further down, causing the compressed red mud and filter plate 310 to move downward together, and causing the telescopic rod 309 and spring 311 to be stretched. Then, the compressed red mud can be taken out from the bottom of the device for subsequent processing. After taking it out, the extrusion plate 303 returns to the initial working state, and the spring 311 will pull the filter plate 310 upward to re-engage with the frame 304. The second electric push rod 313 will retract, causing the limiting block 314 to re-enter the limiting post 312 to limit the limiting post 312, thereby limiting the filter plate 310. After compression, the filter plate 310 and the filter cloth on the filter plate 310 need to be cleaned. The liquid inside the storage tank 210 is drawn out by the third water pump 401 and then transported to the flusher 403 through the second flexible pipe 402. At this time, the second motor 404 is started, which drives the lead screw 405 to rotate, thereby driving the flusher 403 to move and clean the upper surface of the filter plate 310. After the filter cloth is flushed, the flux recovery rate is ≥95% and it can be reused ≥300 times. Rotary floating extraction can obtain low-impurity supernatant with turbidity ≤5 NTU without disturbance, providing a high-quality medium for circulating self-rinsing, avoiding secondary clogging of the filter cloth from the source, and allowing the alkali solution to be reused without secondary filtration; the supernatant self-rinsing makes the filter cloth flux recovery rate ≥95%, ensuring stable extrusion dewatering efficiency, reducing equipment mechanical wear, and realizing closed-loop reuse of the rinsing medium, reducing fresh water consumption and waste liquid discharge. Automatic unloading extrusion achieves high-pressure and high-efficiency dewatering and automated process connection, reducing the red mud moisture content to ≤35% and supporting continuous automated operation of the entire process, amplifying the synergistic value of the two preceding technologies. The three-way linkage achieves comprehensive optimization of processing efficiency, material recovery, energy consumption cost, and equipment stability. The overall processing efficiency is more than 60% higher than that of traditional processes, while also reducing alkali consumption and operation and maintenance costs, solving the industry pain points of red mud treatment.

[0030] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical component are not specifically limited; conventional equipment can be used.

[0031] 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.

[0032] 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 solid-liquid separation device for red mud treatment, comprising a base (1), a sedimentation tank (101) fixedly connected to the top of the base (1), a feed pipe (102) fixedly connected to the top of the sedimentation tank (101), a separation mechanism (2) provided on the top of the base (1), a rinsing mechanism (4) provided on the front of the separation mechanism (2), and a squeezing mechanism (3) provided on the top of the base (1), characterized in that, The separation mechanism (2) includes a first motor (201) fixedly connected to the bottom of the base (1). The output shaft of the first motor (201) is fixedly connected to a rotating shaft (202) via a coupling. The inner wall of the rotating shaft (202) is slidably connected to several sliding plates (203) via a sliding groove. The outer wall of the sliding plate (203) is fixedly connected to a float (204). The outer wall of each sliding plate (203) is fixedly connected to a ring (205). The outer wall of the ring (205) is fixedly connected to a first pipe (206). The outer wall of the first pipe (206) is fixedly connected to a first rotary joint (207). The top of the first rotary joint (207) is rotatably connected to a second rotary joint (208).

2. The solid-liquid separation device for red mud treatment according to claim 1, characterized in that, The outer walls of several sliding plates (203) are in contact with the same parts. The first pipe (206) is made of rubber and has a certain degree of flexibility. The outer wall of the first rotary joint (207) is fixedly connected to the top of the rotating shaft (202). The top of the second rotary joint (208) is fixedly connected to the top cover of the sedimentation tank (101).

3. The solid-liquid separation device for red mud treatment according to claim 2, characterized in that, The top of the second rotary joint (208) is fixedly connected to the first water pump (209) via a pipe. The output end of the first water pump (209) is fixedly connected to the liquid storage tank (210) via a pipe. The outer wall of the liquid storage tank (210) is fixedly connected to the outer wall of the sedimentation tank (101).

4. The solid-liquid separation device for red mud treatment according to claim 3, characterized in that, The extrusion mechanism (3) includes an extrusion box (301) fixedly connected to the top of the base (1), a hydraulic device (302) fixedly connected to the top of the extrusion box (301), an extrusion plate (303) fixedly connected to the output end of the hydraulic device (302) via a hydraulic rod, a frame (304) fixedly connected to the inner wall of the extrusion box (301), a second water pump (305) fixedly connected to the bottom of the base (1), the outer wall of the second water pump (305) fixedly connected to the bottom of the sedimentation tank (101) via a pipe, and a first flexible pipe (306) fixedly connected to the output end of the second water pump (305).

5. A solid-liquid separation device for red mud treatment according to claim 4, characterized in that, The outer wall of the first flexible pipe (306) is slidably connected to the inner wall of the extrusion box (301). The inner wall of the extrusion box (301) is fixedly connected to a first electric push rod (307). The outer wall of the first electric push rod (307) is fixedly connected to a clamping plate (308). The outer wall of the clamping plate (308) is fixedly connected to the outer wall of the first flexible pipe (306). The outer wall of the extrusion box (301) is fixedly connected to a telescopic rod (309). The bottom of the telescopic rod (309) is fixedly connected to a filter plate (310).

6. A solid-liquid separation device for red mud treatment according to claim 5, characterized in that, The outer wall of the filter plate (310) is in contact with the inner wall of the frame (304). A spring (311) is fixedly connected to the top of the filter plate (310). The telescopic rod (309) is located inside the spring (311). A limiting post (312) is fixedly connected to the top of the filter plate (310). A second electric push rod (313) is fixedly connected to the outer wall of the frame (304). A limiting block (314) is fixedly connected to the outer wall of the second electric push rod (313). The outer wall of the limiting block (314) is slidably connected to the inner wall of the extrusion box (301). The outer wall of the limiting block (314) is engaged with the inner wall of the limiting post (312).

7. A solid-liquid separation device for red mud treatment according to claim 6, characterized in that, The rinsing mechanism (4) includes a third water pump (401) fixedly connected to the outer wall of the extrusion box (301). The outer wall of the third water pump (401) is fixedly connected to the inner wall of the storage tank (210) through a pipe. The output end of the third water pump (401) is fixedly connected to a second flexible pipe (402). The end of the second flexible pipe (402) away from the third water pump (401) is fixedly connected to a flusher (403). The outer wall of the extrusion box (301) is fixedly connected to a second motor (404). The output shaft of the second motor (404) is fixedly connected to a lead screw (405) through a coupling. The outer wall of the lead screw (405) is threadedly connected to the inner wall of the flusher (403).

8. A method of using the solid-liquid separation device for red mud treatment according to claim 7, characterized in that, Specifically, the following steps are included: S1. First, after the red mud slurry and precipitant are mixed externally, they are transported to the sedimentation tank (101) through the feed pipe (102). After sedimentation is completed, the first motor (201) is started to drive the rotating shaft (202) to rotate. S2. The rotation of the rotating shaft (202) will drive the sliding plate (203) and the parts on the sliding plate (203) to rotate together. At the same time, through the cooperation of the first water pump (209), the second rotary joint (208), the first rotary joint (207) and the first pipe (206), the supernatant after sedimentation is completed is extracted. S3. During the extraction process, the supernatant will be transported to the storage tank (210) by the first water pump (209) for storage, so that it can be reused later. When the supernatant is extracted, the float (204) will stay above the high-concentration red mud slurry, and the extraction will end at this time. S4. The second water pump (305) transports the remaining high-concentration red mud slurry to the frame (304) through the first flexible pipe (306). After the transportation is completed, the first electric push rod (307) pushes the card plate (308) to remove the first flexible pipe (306). S5. Subsequently, the hydraulic device (302) pushes the extrusion plate (303) to cooperate with the frame (304) to compress the red mud, reduce its volume and squeeze out the water. The water flows away through the filter plate (310). After compression, the second electric push rod (313) is stretched, causing the limit block (314) to disengage from the limit post (312), releasing the limit on the filter plate (310). The extrusion plate (303) continues to move down, driving the compressed red mud and the filter plate (310) to move down. The telescopic rod (309) and the spring (311) are stretched, and the compressed red mud is taken out from the bottom of the device. After taking it out, the extrusion plate (303) is reset, the spring (311) pulls the filter plate (310) back to its original position, and the second electric push rod (313) retracts to make the limit block (314) re-lock into the limit post (312), fixing the filter plate (310). S6. After compression, the third water pump (401) draws liquid from the storage tank (210) and sends it to the flusher (403) through the second flexible pipe (402). The second motor (404) starts and drives the lead screw (405) to rotate, so that the flusher (403) moves and cleans the upper surface of the filter plate (310).

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