A wall-scraping stirring device for solid-liquid extraction
By incorporating a wall-scraping agitator with movable plates and scrapers, the problem of sedimentation on the inner wall of the mixing tank was solved, thus maintaining the effective mass transfer area and improving the rare earth recovery rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 三诺新材料科技(洛阳)有限公司
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-03
AI Technical Summary
When separating rare earth elements using TBP solid-liquid extraction, a high solid content in the slurry can cause solid particles to easily form a hard deposit layer on the inner wall of the mixing tank, resulting in a reduction in the effective mass transfer area, local concentration gradient imbalance leading to emulsification, and a decrease in rare earth recovery rate.
A wall-scraping agitator is designed. By setting movable plates and scrapers on the main agitator blades, the hard deposit layer on the inner wall of the agitator is scraped off. The staggered arrangement of the main agitator blades generates an axial-radial composite flow, eliminating low-speed dead zones. The scrapers push high-concentration slurry into the mainstream zone, disrupting the boundary layer concentration gradient.
It effectively maintains the mass transfer area, avoids local concentration gradient imbalance, improves rare earth recovery rate, prevents emulsification, and enhances rare earth recovery efficiency.
Smart Images
Figure CN224442229U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical separation equipment technology, specifically a scraped-wall stirring device for solid-liquid extraction. Background Technology
[0002] Tributyl phosphate (TBP) is an organic compound, a colorless and almost odorless liquid. It is primarily used as a solvent and is also commonly used as a plasticizer for nitrocellulose, cellulose acetate, chlorinated rubber, and polyvinyl chloride, as well as an extractant for rare metals and a heat exchange medium. In TBP solid-liquid extraction for rare earth element separation, the solid phase mass fraction of the slurry often reaches 25%–40%. Solid particles easily form a hard deposit layer on the inner wall of the stirred tank, leading to a reduction in the effective mass transfer area, local concentration gradient imbalance causing emulsification, and consequently, a decrease in rare earth recovery rate. Therefore, we propose a wall-scraping stirring device for solid-liquid extraction. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a wall-scraping stirring device for solid-liquid extraction. By setting a movable plate and a scraper on the main stirring blade, the hard deposit layer formed on the inner wall of the stirring tank is scraped off while stirring, so as to avoid deposit scaling and maintain an effective mass transfer area, which can effectively solve the problems in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a wall-scraping stirring device for solid-liquid extraction, comprising a stirring tank, a driving mechanism being provided on the upper surface of the stirring tank, a stirring shaft connected to the driving mechanism being rotatably arranged inside the stirring tank, a plurality of main stirring blades being evenly arranged on the stirring shaft, a sliding groove being provided on the side surface of the main stirring blades, a T-shaped movable plate being slidably arranged in the sliding groove, and a scraper being provided on the side surface of the movable plate that contacts the inner wall of the stirring tank; adjacent main stirring blades are staggered, and the distance between the scrapers on adjacent main stirring blades in the height direction is less than 1 mm.
[0005] As a preferred technical solution of this utility model, the drive structure includes a housing disposed on the upper surface of the mixing tank and a pulley assembly disposed within the housing. The pulley assembly includes a driving pulley, a driven pulley, and a belt disposed between the driving pulley and the driven pulley. A servo motor is mounted on the upper surface of the housing, and the output shaft of the servo motor passes through the housing and is connected to the driving pulley.
[0006] As a preferred embodiment of this utility model, the upper surface of the mixing tank is provided with a feed pipe, and the lower part of the side surface of the mixing tank is provided with a discharge pipe.
[0007] As a preferred embodiment of this utility model, a plurality of springs connected to the movable plate are evenly arranged in the groove of the main stirring blade.
[0008] As a preferred technical solution of this utility model, a plurality of telescopic rods connected to the movable plate are evenly arranged in the groove of the main stirring blade, and springs are sleeved on the outside of the telescopic rods.
[0009] As a preferred embodiment of this utility model, the telescopic rod includes a sliding cylinder fixedly disposed on the side surface of the movable plate and a fixed rod fixedly disposed on the inner surface of the slide groove. The fixed rod is slidably disposed inside the sliding cylinder, and a linear bearing corresponding to the fixed rod is disposed inside the sliding cylinder.
[0010] As a preferred technical solution of this utility model, the stirring shaft is further provided with several sets of auxiliary stirring blades fixed by connecting rods, and the auxiliary stirring blades are at least two double helical ribbon stirring blades.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting movable plates and scrapers on the main stirring blades, the hard deposit layer formed on the inner wall of the mixing tank is scraped off while stirring, avoiding deposit scaling and maintaining an effective mass transfer area; the main stirring blades are staggered to generate axial-radial composite flow, eliminating low-speed dead zones; while scraping the wall, the scraper quickly pushes the high-concentration slurry on the wall surface to the mainstream zone, disrupting the boundary layer concentration gradient, avoiding emulsification caused by local concentration gradient imbalance, and improving the rare earth recovery rate. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model;
[0013] Figure 2 This is a schematic diagram of the internal structure of the present invention;
[0014] Figure 3 This utility model Figure 2 A top-view structural diagram;
[0015] Figure 4 This utility model Figure 2 A schematic diagram of the side view structure;
[0016] Figure 5 This is a schematic diagram of the internal structure of the stirring blade of this utility model.
[0017] In the diagram: 1. Mixing tank, 2. Shell, 3. Servo motor, 4. Feed pipe, 5. Discharge pipe, 6. Mixing shaft, 7. Main mixing blade, 8. Movable plate, 9. Scraper, 10. Turbulence hole, 11. Telescopic rod, 12. Spring, 13. Connecting rod, 14. Secondary mixing blade. Detailed Implementation
[0018] 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.
[0019] Please see Figure 1-5 This utility model provides a technical solution: a wall-scraping stirring device for solid-liquid extraction, including a stirring tank 1. A driving mechanism is provided on the upper surface of the stirring tank 1. A stirring shaft 6 connected to the driving mechanism is rotatably provided inside the stirring tank 1. Several sets of main stirring blades 7 are evenly arranged on the stirring shaft 6. A sliding groove is opened on the side surface of the main stirring blades 7. A T-shaped movable plate 8 is slidably arranged in the sliding groove. A sliding seal is provided between the movable plate 8 and the inner wall of the sliding groove. The sliding seal adopts a commonly used dynamic sealing component, so that the sliding plate 8 can slide in the sliding groove while maintaining a seal, preventing material from entering the sliding groove.
[0020] The side surface of the movable plate 8 is provided with a scraper 9 that contacts the inner wall of the mixing tank 1. The scraper 9 can move with the sliding plate 8, and can prevent the scraper 9 from being stuck or damaged when there are stubborn scales or deposits on the inner wall.
[0021] By setting movable plates 8 and scrapers 9 on the main stirring blades 7, the hard deposit layer formed on the inner wall of the mixing tank is scraped off while stirring, avoiding deposit scaling and maintaining an effective mass transfer area. The adjacent main stirring blades 7 are staggered to generate axial-radial composite flow, eliminating low-speed dead zones. While scraping the wall, the scraper 9 quickly pushes the high-concentration slurry on the wall surface to the mainstream area, disrupting the boundary layer concentration gradient, avoiding emulsification caused by local concentration gradient imbalance, and improving the rare earth recovery rate.
[0022] The distance between the scrapers 9 on the adjacent main stirring blades 7 in the vertical direction is less than 1 mm, which eliminates the blind spot of scraping and keeps the inner wall of the mixing tank 1 in a "bare wall" state, maintaining the maximum mass transfer area.
[0023] In a preferred embodiment, the drive structure includes a housing 2 mounted on the upper surface of the mixing tank 1 and a pulley assembly within the housing 2. The pulley assembly includes a driving pulley, a driven pulley, and a belt positioned between the driving and driven pulleys. A servo motor 3 is mounted on the upper surface of the housing 2. The servo motor 3 is connected to an external control switch or controller and powered by an external power supply. The output shaft of the servo motor 3 passes through the housing 2 and connects to the driving pulley. The servo motor 3 drives the driving pulley to rotate, which in turn drives the driven pulley to rotate via the belt. The driven pulley is connected to the mixing shaft 6, thereby driving the mixing shaft 6 and the main mixing blades 7 to rotate, thus mixing the material. Compared to direct gear or coupling connections, the elasticity of the belt significantly reduces torque impact during start-up / stopping, preventing instantaneous jamming of high-solids-content slurry.
[0024] The servo motors 3 and the like used in this application are all commonly used electronic components in the prior art. Their specific structures, working principles, control methods and circuit connections are all well-known technologies and will not be described in detail here.
[0025] In a preferred embodiment, the upper surface of the mixing tank 1 is provided with a feed pipe 4, and the lower part of the side surface of the mixing tank 1 is provided with a discharge pipe 5. Both the feed pipe 4 and the discharge pipe 5 are provided with corresponding control valves for controlling the feeding and discharging.
[0026] In a preferred embodiment, a plurality of springs 12 connected to the movable plate 8 are evenly arranged in the groove of the main stirring blade 7. Under the elastic force of the springs 12, the movable plate 8 is always pushed outward, thereby keeping the scraper 9 in close contact with the inner wall of the mixing tank 1 to scrape away the deposits. When there are stubborn deposits on the inner wall of the mixing tank 1, the scraper 9 can be compressed by the movable plate 8 to retract the springs 12, preventing the scraper 9 from getting stuck or damaged at that point.
[0027] In a further preferred technical solution, a plurality of telescopic rods 11 connected to the movable plate 8 are evenly arranged in the groove of the main stirring blade 7. The spring 12 is sleeved on the outside of the telescopic rod 11. The telescopic rod 11 can play a certain protective role for the spring 12 and prevent non-radial deformation during its extension and contraction.
[0028] Furthermore, the telescopic rod 11 includes a sliding cylinder fixedly disposed on the side surface of the movable plate 8 and a fixed rod fixedly disposed on the inner surface of the slide groove. The fixed rod is slidably disposed inside the sliding cylinder, and a linear bearing corresponding to the fixed rod is disposed inside the sliding cylinder. The linear bearing achieves low-resistance movement through rolling friction and adopts a point contact method between the bearing ball and the shaft, which has the characteristics of low friction and high precision. This can reduce the resistance when the telescopic rod 11 extends or retracts, thereby reducing the resistance when the movable plate 8 moves.
[0029] In an optional technical solution, the stirring shaft 6 is further provided with several sets of auxiliary stirring blades 14 fixed by connecting rods 13. The auxiliary stirring blades 14 are at least two double helical ribbon stirring blades. The double helical ribbon stirring blades can make the stirring range cover the entire cross-section of the stirring tank 1. Under the action of the double helical ribbon stirring blades, the fluid medium flows upward along the container wall under the push of the stirrer, while the fluid near the stirring shaft flows downward. This can further enhance the axial large circulation and suppress the concentration gradient. At the same time, the velocity gradient generated by the double helical ribbon is relatively gentle, which can reduce the shear gradient and emulsification tendency.
[0030] Optionally, the side surface of the main stirring blade 7 is uniformly provided with several turbulence holes. High solid content rare earth slurry is prone to forming a laminar boundary layer on the blade surface, which leads to a decrease in mass transfer efficiency. The turbulence holes 10 cause local eddies in the slurry before and after the holes, reducing the laminar thickness and improving the stirring effect.
[0031] The parts not disclosed in this utility model are all prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A scraping-type stirring device for solid-liquid extraction, comprising a stirring tank (1), characterized in that: The upper surface of the mixing tank (1) is provided with a driving mechanism. The mixing tank (1) is rotatably provided with a stirring shaft (6) connected to the driving mechanism. Several sets of main stirring blades (7) are evenly arranged on the stirring shaft (6). The side surface of the main stirring blades (7) is provided with a sliding groove. A T-shaped movable plate (8) is slidably arranged in the sliding groove. The side surface of the movable plate (8) is provided with a scraper (9) that contacts the inner wall of the mixing tank (1). The upper and lower adjacent main stirring blades (7) are staggered. The distance between the scrapers (9) on the upper and lower adjacent main stirring blades (7) in the height direction is less than 1 mm.
2. A scraping wall type stirring device for solid-liquid extraction according to claim 1, characterized in that: The drive mechanism includes a housing (2) disposed on the upper surface of the mixing tank (1) and a pulley assembly disposed inside the housing (2). The pulley assembly includes a drive pulley, a driven pulley and a belt disposed between the drive pulley and the driven pulley. A servo motor (3) is mounted on the upper surface of the housing (2). The output shaft of the servo motor (3) passes through the housing (2) and is connected to the drive pulley.
3. A scraping wall type stirring device for solid-liquid extraction according to claim 1, characterized in that: The upper surface of the mixing tank (1) is provided with a feed pipe (4), and the lower part of the side surface of the mixing tank (1) is provided with a discharge pipe (5).
4. The scraping wall type stirring device for solid-liquid extraction according to claim 1, characterized in that: The main stirring blade (7) has several springs (12) evenly arranged in the groove, which are connected to the movable plate (8).
5. A scraped wall agitator for solid-liquid extraction according to claim 4, wherein: The main stirring blade (7) has several telescopic rods (11) evenly arranged in the groove, which are connected to the movable plate (8), and springs (12) are sleeved on the outside of the telescopic rods (11).
6. A scraped wall agitator for solid-liquid extraction according to claim 5, wherein: The telescopic rod (11) includes a sliding cylinder fixedly disposed on the side surface of the movable plate (8) and a fixed rod fixedly disposed on the inner surface of the slide groove. The fixed rod is slidably disposed inside the sliding cylinder, and a linear bearing corresponding to the fixed rod is disposed inside the sliding cylinder.
7. A scraping wall type stirring device for solid-liquid extraction according to claim 1, characterized in that: The stirring shaft (6) is also provided with several sets of auxiliary stirring blades (14) fixed by connecting rods (13). The auxiliary stirring blades (14) are at least two double helical ribbon stirring blades.