A rare earth recovery device in rare earth wastewater and its use method

Abstract

The present invention relates to the field of rare earth recovery technology, specifically to a rare earth recovery device in rare earth wastewater and a method of using the device, comprising a first reactor, a first shaking filter mechanism, a second reactor, a second shaking filter mechanism, an ion exchange box and a third reactor, wherein the first reactor, the first shaking filter mechanism, the second reactor, the second shaking filter mechanism and the ion exchange box are all connected by pipes, and a supporting sliding assembly is provided on the lower surface of the base. The present invention adopts secondary precipitation, secondary shaking and primary ion exchange, which can greatly improve the efficiency of rare earth recovery, and the rare earth ions in the wastewater can be almost completely recovered, thereby avoiding that a small amount of rare earth substances in the form of ions will flow away with the wastewater after simple filtration of the wastewater, and the rare earth resources in the wastewater can be precipitated and recovered after filtration, thereby improving the recovery efficiency of the device.

Description

Technical Field

[0001] The invention relates to the technical field of rare earth recovery, and in particular to a rare earth recovery device in rare earth wastewater and a use method thereof. Background Art

[0002] Rare earth is a general term for 17 metal elements including lanthanide elements, scandium and yttrium in the periodic table. Wastewater will be produced during the refining of rare earths, but the rare earth wastewater will still contain a large amount of rare earths. Therefore, a recovery device is needed to recover the rare earths in the rare earth wastewater.

[0003] The existing patent, with the announcement number CN118186237A, discloses a rare earth recovery device in rare earth wastewater, including a bottom plate, two support plates are fixedly connected to the upper surface of the bottom plate, a reciprocating screw is rotatably connected between the two support plates, a fixed rod is fixedly connected between the two support plates, a bracket is threadedly connected to the reciprocating screw, and the bracket and the fixed rod are slidably connected; a filter assembly is arranged on the bracket, the filter assembly includes a filter ring and a filter plate, the cross section of the filter ring is arranged in a circular ring shape, the filter plate and the lower surface of the filter ring are fitted, and the filter ring and the bracket are fixedly connected. The present invention can better and more thoroughly realize the recovery of rare earths in wastewater, the operation is relatively convenient and fast, the cost is low, and it is convenient to take out the recovered rare earths, the device has good practicality, and is conducive to the recovery of rare earths.

[0004] The above-mentioned rare earth wastewater recovery device only performs simple filtration, and rare earths are difficult to precipitate quickly, resulting in low recovery efficiency. After the rare earth wastewater is acid-leached, a part of the rare earth will exist in the wastewater in the form of ions. Simple filtration will lead to a low rare earth recovery rate and the wastewater will be difficult to meet the industrial wastewater discharge standards.

[0005] In view of this, the present invention proposes a rare earth recovery device in rare earth wastewater and a method of using the same to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a rare earth recovery device in rare earth wastewater and a method of using the same, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rare earth recovery device in rare earth wastewater, comprising a first reactor, a first shaking filter mechanism, a second reactor, a second shaking filter mechanism, an ion exchange box and a third reactor, wherein the first reactor, the first shaking filter mechanism, the second reactor, the second shaking filter mechanism and the ion exchange box are all connected by pipelines, and a supporting sliding assembly is provided on the lower surface of the base;

[0008] The first shaking and filtering mechanism and the second shaking and filtering mechanism have the same structure, and the first shaking and filtering mechanism comprises a shaking component, a filtering component and a sedimentation component;

[0009] The shaking assembly includes a vertical tube installed at the four corners of the upper surface of the base, a motor is fixedly installed on the inner wall of the vertical tube, a cam is fixedly installed on the output shaft of the motor, damping rods are fixedly installed at the four corners of the inner bottom wall of the vertical tube, a slide plate is placed on the top of the damping rod, a shaking rod is fixedly installed on the top of the slide plate, and the top of the shaking rod passes through the vertical tube and extends to the outside of the vertical tube;

[0010] The filter assembly includes a filter box installed on the top of the shaking rod, the four corners of the inner bottom wall of the filter box are fixedly installed with shock-absorbing springs, the top of the shock-absorbing spring is fixedly installed with a mesh plate, the upper surface of the mesh plate is fixedly installed with a guardrail, the bottom of the filter box is connected with a transmission pipe, one side of the filter box is connected with a cleaning pipe, one side of the guardrail is provided with a cleaning port, and a blocking plate is inserted on the guardrail;

[0011] The sedimentation assembly includes a sedimentation box fixed on a base, the inner bottom wall of the sedimentation box is arranged in an inclined state, an overflow plate and a baffle plate are fixedly installed on the inner bottom wall of the sedimentation box, a discharge pipe and an overflow pipe are connected to the two sides of the sedimentation box, and the transmission pipe is located between the overflow plate and the baffle plate.

[0012] Preferably, the first reactor, the second reactor and the third reactor have the same structure, the first reactor comprises a reaction box, the upper end of the reaction box is provided with a feeding port, a stirring motor is fixedly installed on the upper part of the reaction box, and the output end of the stirring motor extends into the interior of the reaction box and is fixedly installed with a stirring rod.

[0013] Preferably, the inclination angle of the inner bottom wall of the sedimentation box is 15-30 degrees, the inner bottom wall of the sedimentation box is set to be higher at one end and lower at the other end, the overflow plate is installed at the higher end of the inner bottom wall, the baffle is installed at the lower end, and the overflow pipe is arranged on the side close to the overflow plate, the mouth of the overflow pipe is inclined downward, and the end of the overflow pipe close to the sedimentation box is set to have the mouth inclined upward, and the overflow pipe is an inverted V-shape.

[0014] Preferably, a gate plate is inserted into the upper surface of the discharge pipe, a baffle is fixedly installed on the top of the gate plate, a threaded rod is inserted on the baffle, the bottom of the threaded rod passes through the baffle and extends to the outside of the baffle, the bottom of the threaded rod is rotatably connected to the top of the discharge pipe through a bearing, the threaded rod is threadedly connected to the threaded hole opened on the baffle, a handwheel is fixedly installed on the top of the threaded rod, and a raised rod is fixedly installed on the surface of the handwheel.

[0015] Preferably, a strip-shaped guide groove is provided at the diagonal position of the filter box, and a V-shaped guide groove is provided between the two strip-shaped guide grooves to connect the two strip-shaped guide grooves.

[0016] Preferably, the surface of the guardrail is slidably connected to the inner wall of the filter box, and the guardrail is adapted to the filter box, the cleaning pipe is connected to the cleaning port, a slot is provided on the guardrail for the blocking plate to pass through, and the inner wall of the slot is fitted with the surface of the blocking plate, the bottom of the blocking plate is fitted with the upper surface of the mesh plate, and a bolt threadedly connected to one side of the blocking plate is inserted on one side of the guardrail.

[0017] Preferably, a nut on one side of the bolt fits against one side of the guardrail, and a screw hole for threaded connection of the bolt is provided on the guardrail.

[0018] Preferably, the supporting sliding assembly includes slide rails installed on both sides of the bottom of the base, the bottom wall of the slide groove of the slide rail is rotatably connected to the support roller through a rotating shaft, a receiving plate is provided above the slide rail, and sliding blocks are fixedly installed at the four corners of the bottom of the receiving plate, the sliding block is slidably connected to the slide groove in the slide rail, and the surface of the support roller is rollingly connected to the lower surface of the sliding block, a magnet ring is fixedly installed on one side of the slide rail, a plug rod is inserted into the inside of the magnet ring, a positioning iron plate is fixedly installed on one end of the plug rod, and a pull ring is fixedly installed on one side of the positioning iron plate, one end of the plug rod passes through one of the slide rails and extends into the slide groove of the slide rail, one end of the plug rod located in the slide groove is plugged into one side of one of the sliding blocks, and plug holes for plugging the plug rod are opened on the outer sides of the four sliding blocks.

[0019] Preferably, a plate groove for the gate plate to pass through is opened on the discharge pipe, the inner wall of the plate groove is slidably connected to the surface of the gate plate, the bottom and both sides of the gate plate are inlaid with rubber strips, and the side of the rubber strip away from the gate plate is in contact with the inner wall of the discharge pipe.

[0020] A method for using a rare earth recovery device in rare earth wastewater is:

[0021] The first step is to introduce rare earth wastewater into the first reactor, and add sodium carbonate solution into the first reactor to react;

[0022] The second step is to introduce the wastewater after the first reaction into the first shaking and filtering mechanism for the first shaking, sedimentation and filtration;

[0023] The third step is to introduce the wastewater filtered out of the first shaking filter mechanism into the second reactor, and add oxalic acid into the second reactor to react again;

[0024] The third step is to introduce the wastewater after the second reaction into the second shaking and filtering mechanism for a second shaking, sedimentation and filtration;

[0025] The fourth step is to introduce the wastewater filtered out by the second shaking filter mechanism into the ion exchange box, and exchange it with the cation exchange resin in the ion exchange box, thereby exchanging the free rare earth ions;

[0026] The fifth step is to put the rare earth residue filtered out from the first shaking filtration mechanism, the second shaking filtration mechanism and the ion exchange box into the third reactor, add hydrochloric acid to filter and obtain a leaching solution, add oxalic acid to the leaching solution to produce oxalic acid precipitate, and use a Ma Fei furnace for roasting to obtain rare earth oxide.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention adopts secondary precipitation, secondary shaking and primary ion exchange, which can greatly improve the efficiency of rare earth recovery, and the rare earth ions in the wastewater can be almost completely recovered, and the wastewater can also meet the industrial wastewater discharge standards;

[0029] 2. The present invention achieves the purpose of shaking the filter assembly by setting a shaking assembly, which accelerates the filtering effect of the filter assembly on wastewater and can also drive the filter assembly to shake, thereby avoiding clogging of components of the filter assembly during the filtering process and maintaining smooth filtering of the filter assembly;

[0030] 3. The present invention achieves the effect of supporting and sliding the receiving tray by setting up a supporting sliding assembly, and at the same time facilitates the staff to take out and position the receiving tray, so as to collect the recovered rare earth materials and facilitate subsequent further refining. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the overall device flow chart of the present invention;

[0032] Figure 2 This is a schematic cross-sectional structural diagram of the first reactor of the present invention;

[0033] Figure 3 It is a schematic diagram of a three-dimensional cross-sectional structure of the first shaking filtering mechanism of the present invention;

[0034] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0035] Figure 5 The three-dimensional structure diagram of the first shaking filtering mechanism of the present invention is shown in FIG. Figure 1 ;

[0036] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at B in the middle;

[0037] Figure 7 The three-dimensional structure diagram of the first shaking filtering mechanism of the present invention is shown in FIG. Figure 2 ;

[0038] Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at C in the middle;

[0039] Fig. 9 For the present invention Figure 7 A magnified schematic diagram of the structure at D in the middle;

[0040] Fig.10 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention from a second viewing angle;

[0041] Fig.11 It is a process flow chart of the present invention.

[0042] In the figure:

[0043] 1. The first reactor;

[0044] 2. Shaking assembly; 200. Vertical pipe; 201. Motor; 202. Cam; 203. Damping rod; 204. Slide plate; 205. Shaking rod;

[0045] 3. Filter assembly; 300. Filter box; 301. Shock-absorbing spring; 302. Screen; 303. Guardrail; 304. Transmission pipe; 305. Cleaning pipe; 306. Blocking plate; 307. Bolt;

[0046] 4. Sedimentation assembly; 400. Sedimentation box; 401. Overflow plate; 402. Baffle plate; 403. Discharge pipe; 404. Overflow pipe; 405. Gate; 406. Baffle; 407. Threaded rod;

[0047] 5. Support sliding assembly; 500, slide rail; 501, support roller; 502, receiving plate; 503, sliding block; 504, magnet ring; 505, plug rod; 506, positioning iron plate;

[0048] 6. Second reactor; 7. Ion exchange box; 8. First shaking filtration mechanism; 9. Second shaking filtration mechanism; 10. Third reactor; 11. Reaction box; 12. Feeding port; 13. Stirring motor; 14. Stirring rod. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] See also Figures 1 to 11The present invention provides a technical solution: a rare earth recovery device in rare earth wastewater, comprising a first reactor 1, a first shaking filter mechanism 8, a second reactor 6, a second shaking filter mechanism 9, an ion exchange box 7 and a third reactor 10, the first reactor 1, the first shaking filter mechanism 8, the second reactor 6, the second shaking filter mechanism 9 and the ion exchange box 7 are all connected by pipes, and a supporting sliding assembly 5 is provided on the lower surface of the base.

[0051] The specific practical method is: introduce the rare earth wastewater into the first reactor 1, and add sodium carbonate solution to the first reactor 1, after reaction and precipitation, introduce the wastewater into the first shaking filter mechanism 8, after shaking, precipitation and filtration, introduce the wastewater into the second reactor 6, and add oxalic acid to the second reactor 6, after reaction and precipitation again, introduce the wastewater into the second shaking filter mechanism 9, after secondary shaking, precipitation and filtration, introduce the wastewater into the ion exchange box 7, and exchange with the cation exchange resin in the ion exchange box 7 (the commonly used cation exchange resin is sulfonic acid cation exchange resin, which has an active group with ion exchange capacity-SO3H. The active group has exchange capacity because it has an anion group fixed on the resin skeleton and a free cation, which can be combined with the cation in the solution. The active groups are hydrophilic, and the dry resin swells when it meets water. At this time, the active groups will produce a unique dissociation into anions fixed on the resin and free cations. That is, SO3H. When the swollen cation exchange resin contacts the electrolyte solution, the active groups are ionized, and the free cations exchange with the cations in the solution. The technology should be relatively mature, so I won’t go into details here) to exchange the free rare earth ions. The filtered wastewater can meet the discharge standard of industrial wastewater. The rare earth slag filtered out by the first shaking filter mechanism 8, the second shaking filter mechanism 9 and the ion exchange box 7 is placed in the third reactor 10, and hydrochloric acid is added to filter to obtain a leachate. After adding oxalic acid to the leachate, oxalic acid precipitate is produced, and roasted in a Ma Fuel furnace to obtain rare earth oxide.

[0052] Among them, the first shaking and filtering mechanism 8 and the second shaking and filtering mechanism 9 have the same structure, and the first shaking and filtering mechanism 8 includes a shaking component 2, a filtering component 3 and a sedimentation component 4.

[0053] Specifically, Figure 4 As shown, the shaking assembly 2 includes a vertical tube 200 installed at the four corners of the upper surface of the base, a motor 201 is fixedly installed on the inner wall of the vertical tube 200, a cam 202 is fixedly installed on the output shaft of the motor 201, damping rods 203 are fixedly installed at the four corners of the inner bottom wall of the vertical tube 200, a slide plate 204 is placed on the top of the damping rod 203, a shaking rod 205 is fixedly installed on the top of the slide plate 204, and the top of the shaking rod 205 passes through the vertical tube 200 and extends to the outside of the vertical tube 200;

[0054] Specifically, Figure 3 , Figure 5 and Figure 6 As shown, the filter assembly 3 includes a filter box 300 installed on the top of the shaking rod 205, a strip guide groove is opened at the diagonal of the filter box 300, and a V-shaped guide groove connecting the two strip guide grooves is opened between the two strip guide grooves, and shock-absorbing springs 301 are fixedly installed at the four corners of the inner bottom wall of the filter box 300, a mesh plate 302 is fixedly installed on the top of the shock-absorbing spring 301, and a guardrail 303 is fixedly installed on the upper surface of the mesh plate 302. The bottom of the filter box 300 is connected to a transmission pipe 304, and one side of the filter box 300 is connected to a cleaning pipe 305. A cleaning port is opened on one side of the guardrail 303, and a cleaning port is opened on the guardrail 303. A blocking plate 306 is inserted, the surface of the guardrail 303 is slidably connected to the inner wall of the filter box 300, and the guardrail 303 is adapted to the filter box 300, the cleaning pipe 305 is connected to the cleaning port, a slot for the blocking plate 306 to pass through is opened on the guardrail 303, and the inner wall of the slot is fitted with the surface of the blocking plate 306, the bottom of the blocking plate 306 is fitted with the upper surface of the mesh plate 302, a bolt 307 threadedly connected to one side of the blocking plate 306 is inserted on one side of the guardrail 303, a nut on one side of the bolt 307 is fitted with one side of the guardrail 303, and a screw hole for the bolt 307 to be threadedly connected is opened on the guardrail 303;

[0055] Specifically, Figure 8 As shown, the sedimentation assembly 4 includes a sedimentation box 400 fixed on the base, the inner bottom wall of the sedimentation box 400 is set to an inclined state, the inner bottom wall of the sedimentation box 400 is respectively fixedly installed with an overflow plate 401 and a baffle plate 402, the two sides of the sedimentation box 400 are respectively connected with a discharge pipe 403 and an overflow pipe 404, the transmission pipe 304 is located between the overflow plate 401 and the baffle plate 402, the inclination angle of the inner bottom wall of the sedimentation box 400 is 15-30 degrees, the inner bottom wall of the sedimentation box 400 is set to have one end high and the other end low, the overflow plate 401 is installed at the higher end of the inner bottom wall, the baffle plate 402 is installed at the lower end, and the overflow pipe 404 is arranged at a side close to the overflow plate 401. On the side, the mouth of the overflow pipe 404 is inclined downward, and one end of the overflow pipe 404 close to the sedimentation box 400 is set to have the mouth inclined upward, the overflow pipe 404 is an inverted V-shape, a gate plate 405 is inserted on the upper surface of the discharge pipe 403, a baffle 406 is fixedly installed on the top of the gate plate 405, a threaded rod 407 is inserted on the baffle 406, the bottom of the threaded rod 407 passes through the baffle 406 and extends to the outside of the baffle 406, the bottom of the threaded rod 407 is rotatably connected to the top of the discharge pipe 403 through a bearing, the threaded rod 407 is threadedly connected to the threaded hole opened on the baffle 406, a handwheel is fixedly installed on the top of the threaded rod 407, and a raised rod is fixedly installed on the surface of the handwheel.

[0056] It is worth mentioning that the inner bottom wall of the sedimentation box 400 is set at an inclination angle of 15-30 degrees. In the process of increasing wastewater, the precipitated material will flow to the lower place with the inclination angle, and then accumulate at the lowest point. The overflow plate 401 is set to separate the water that is initially precipitated and the wastewater that is about to be discharged to avoid mixing of rare earth elements. At the same time, the baffle plate 402 is set to prevent the wastewater on one side of the baffle plate 402 from being affected by the impact of the water flow discharged from the transmission pipe 304 during secondary precipitation, thereby avoiding the backflow of elements after secondary precipitation. The threaded rod 407 and the baffle 406 are matched. When the threaded rod 407 rotates, the fit degree between the gate plate 405 and the inner wall of the discharge pipe 403 and the opening degree between the discharge pipe 403 and the gate plate 405 can be adjusted to facilitate the operation of the staff. At the same time, a rubber strip is embedded on the surface of the gate plate 405 to increase the sealing effect between the gate plate 405 and the inner wall of the discharge pipe 403.

[0057] Furthermore, a plate groove is provided on the discharge pipe 403 for the gate plate 405 to pass through, and the inner wall of the plate groove is slidably connected to the surface of the gate plate 405. The bottom and both sides of the gate plate 405 are inlaid with rubber strips, and the side of the rubber strip away from the gate plate 405 is in contact with the inner wall of the discharge pipe 403.

[0058] Specifically, Fig. 9 As shown, the supporting sliding assembly 5 includes a slide rail 500 installed on both sides of the bottom of the base, the bottom wall of the slide groove of the slide rail 500 is rotatably connected with a support roller 501 through a rotating shaft, a receiving plate 502 is arranged above the slide rail 500, and sliding blocks 503 are fixedly installed at the four corners of the bottom of the receiving plate 502. The sliding block 503 is slidably connected to the slide groove in the slide rail 500, and the surface of the support roller 501 is rollingly connected to the lower surface of the sliding block 503. One side of the slide rail 500 is fixedly installed There is a magnet ring 504, and an insertion rod 505 is inserted inside the magnet ring 504. A positioning iron plate 506 is fixedly installed on one end of the insertion rod 505, and a pull ring is fixedly installed on one side of the positioning iron plate 506. One end of the insertion rod 505 passes through one of the slide rails 500 and extends into the slide groove of the slide rail 500. The end of the insertion rod 505 located inside the slide groove is plugged into one side of one of the sliding blocks 503, and the outer sides of the four sliding blocks 503 are provided with plugging holes for the insertion of the insertion rod 505.

[0059] The supporting sliding assembly 5 is provided to achieve the effect of supporting and sliding the receiving tray 502, and at the same time facilitates the staff to take out and position the receiving tray 502, so as to collect the recovered rare earth materials and facilitate subsequent further refining.

[0060] When it is necessary to recycle the rare earth elements in the rare earth wastewater, first check whether the bottom of the baffle plate 306 is in contact with the upper surface of the mesh plate 302, then tighten the bolt 307, and tighten the threaded rod 407 at the same time, so that the gate plate 405 at the bottom of the baffle plate 406 is in contact with the inner wall of the discharge pipe 403. After the preparation work is completed, the wastewater to be filtered and recycled is introduced into the interior of the filter box 300, and the motor 201 is controlled to work, and the motor 201 drives the cam 202 to rotate, and the cam 202 hits the lower surface of the slide plate 204, so that the shaking rod 205 on the slide plate 204 drives the filter box 300 to move. 00 shakes, and at the same time, the mesh plate 302 filters the wastewater. The rare earth slag that settles first is filtered by the mesh plate 302 and remains on the mesh plate 302. At the same time, during the shaking process of the mesh plate 302, the mesh holes of the mesh plate 302 can also be kept from being completely blocked by the rare earth slag. The filtered wastewater passes through the mesh plate 302 and enters the interior of the filter box 300, and then flows to the interior of the sedimentation box 400 through the transmission pipe 304. Since the transmission pipe 304 is set as an inclined pipe with an arc, the impact force of the wastewater when it flows into the sedimentation box 400 is small. The inner bottom wall of the sedimentation box 400 is set in an inclined state. 0 increases, when the liquid level exceeds the height of the overflow plate 401, due to the sedimentation effect, the rare earth elements sink in the wastewater, and the upper clear liquid after sedimentation (there will still be rare earths in the wastewater after the first shaking sedimentation, and a small amount of rare earths will exist in the upper clear liquid in the form of ions after the second shaking sedimentation) is located in the upper layer of the sedimentation tank 400, and the wastewater exceeding the top of the overflow plate 401 enters one side of the overflow plate 401 and then settles again. When the liquid level exceeds the height of the nozzle of the overflow pipe 404, the liquid is discharged through the overflow pipe 404. At the same time, due to the set sedimentation tank 40 0 The inner bottom wall is in an inclined state. After sedimentation, part of the wastewater containing rare earth elements remains between the baffle plate 402 and the overflow plate 401, and the other part overflows the top of the baffle plate 402 and enters the side of the baffle plate 402 and the inner wall of the sedimentation box 400 for re-sedimentation. When the wastewater filtration is completed, the control motor 201 stops working, and at the same time, a small amount of wastewater containing rare earth elements between the baffle plate 402 and the overflow plate 401 and between the overflow plate 401 and the inner wall of the sedimentation box 400 is slowly pumped to between the baffle plate 402 and the inner wall of the sedimentation box 400 by a pumping pipe, and then the device is left to stand;

[0061] When the rare earth elements in the precipitation box 400 are precipitated, the rod 505 on the positioning iron plate 506 is pulled so that one end of the rod 505 is flush with one side of the inner wall of the slide groove, and then the sliding block 503 on the receiving plate 502 is inserted into the slide groove of the slide rail 500. When the sliding block 503 on the receiving plate 502 is pushed into place, the rod 505 on the positioning iron plate 506 is pushed into the inside of the slide groove so that the rod 505 is plugged into one side of the sliding block 503. At the same time, the magnet ring 504 is magnetically adsorbed with the positioning iron plate 506. Loosen the threaded rod 407 to separate the gate plate 405 on the baffle plate 406 from the discharge pipe 403, then put the wastewater containing rare earth elements in the sedimentation box 400 into the receiving plate 502, then loosen the bolt 307, then pull the baffle plate 306 upward, and then tighten the bolt 307 to position the baffle plate 306, and then clean out the materials containing rare earth elements filtered on the mesh plate 302 (the cleaned rare earth residue is introduced into the third reactor 10), thereby completing the shaking, sedimentation and filtering operations.

[0062] Specifically, the first reactor 1, the second reactor 6 and the third reactor 10 have the same structure. The first reactor 1 includes a reaction box 11. A feeding port 12 is provided at the upper end of the reaction box 11. A stirring motor 13 is fixedly installed on the upper part of the reaction box 11. The output end of the stirring motor 13 extends to the interior of the reaction box 11 and is fixedly installed with a stirring rod 14.

[0063] By providing the stirring motor 13 and the stirring rod 14, the acidic substance added into the reactor can be quickly integrated with the rare earth wastewater, thereby accelerating the acid leaching process and improving the treatment efficiency.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rare earth recovery device for rare earth wastewater, comprising a base, a first reactor (1), a first shaking filter mechanism (8), a second reactor (6), a second shaking filter mechanism (9), an ion exchange box (7) and a third reactor (10), characterized in that: The first reactor (1), the first shaking and filtering mechanism (8), the second reactor (6), the second shaking and filtering mechanism (9) and the ion exchange box (7) are all connected via pipelines, and a supporting sliding component (5) is provided on the lower surface of the base; The first shaking and filtering mechanism (8) and the second shaking and filtering mechanism (9) have the same structure, and the first shaking and filtering mechanism (8) comprises a shaking component (2), a filtering component (3) and a sedimentation component (4); The shaking assembly (2) comprises a vertical tube (200) installed at four corners of the upper surface of the base, a motor (201) is fixedly installed on the inner wall of the vertical tube (200), a cam (202) is fixedly installed on the output shaft of the motor (201), damping rods (203) are fixedly installed at the four corners of the inner bottom wall of the vertical tube (200), a slide plate (204) is placed on the top of the damping rod (203), a shaking rod (205) is fixedly installed on the top of the slide plate (204), and the top of the shaking rod (205) passes through the vertical tube (200) and extends to the outside of the vertical tube (200); The filter assembly (3) comprises a filter box (300) mounted on the top of the shaking rod (205); shock-absorbing springs (301) are fixedly mounted on the four corners of the inner bottom wall of the filter box (300); a mesh plate (302) is fixedly mounted on the top of the shock-absorbing spring (301); a guardrail (303) is fixedly mounted on the upper surface of the mesh plate (302); a transmission pipe (304) is connected to the bottom of the filter box (300); a cleaning pipe (305) is connected to one side of the filter box (300); a cleaning port is opened on one side of the guardrail (303); and a blocking plate (306) is inserted on the guardrail (303); The sedimentation assembly (4) comprises a sedimentation box (400) fixed on a base, the inner bottom wall of the sedimentation box (400) is arranged in an inclined state, an overflow plate (401) and a baffle plate (402) are respectively fixedly mounted on the inner bottom wall of the sedimentation box (400), a discharge pipe (403) and an overflow pipe (404) are respectively connected on both sides of the sedimentation box (400), and the transmission pipe (304) is located between the overflow plate (401) and the baffle plate (402).

2. The rare earth recovery device in rare earth wastewater according to claim 1, characterized in that: The first reactor (1), the second reactor (6) and the third reactor (10) have the same structure. The first reactor (1) comprises a reaction box (11). A feeding port (12) is arranged at the upper end of the reaction box (11). A stirring motor (13) is fixedly installed at the upper part of the reaction box (11). The output end of the stirring motor (13) extends into the interior of the reaction box (11) and is fixedly installed with a stirring rod (14).

3. The rare earth recovery device in rare earth wastewater according to claim 1, characterized in that: The inner bottom wall of the sedimentation box (400) has an inclination angle of 15-30 degrees. The inner bottom wall of the sedimentation box (400) is arranged with one end higher than the other end. The overflow plate (401) is installed at the higher end of the inner bottom wall, and the baffle plate (402) is installed at the lower end. The overflow pipe (404) is arranged on a side close to the overflow plate (401). The pipe mouth of the overflow pipe (404) is inclined downward. The end of the overflow pipe (404) close to the sedimentation box (400) is arranged with the pipe mouth inclined upward. The overflow pipe (404) is in an inverted V shape.

4. The rare earth recovery device in rare earth wastewater according to claim 1, characterized in that: A gate plate (405) is inserted into the upper surface of the discharge pipe (403), a baffle plate (406) is fixedly installed on the top of the gate plate (405), a threaded rod (407) is inserted into the baffle plate (406), the bottom of the threaded rod (407) passes through the baffle plate (406) and extends to the outside of the baffle plate (406), the bottom of the threaded rod (407) is rotatably connected to the top of the discharge pipe (403) through a bearing, the threaded rod (407) is threadedly connected to a threaded hole opened on the baffle plate (406), a hand wheel is fixedly installed on the top of the threaded rod (407), and a raised rod is fixedly installed on the surface of the hand wheel.

5. The rare earth recovery device in rare earth wastewater according to claim 1, characterized in that: The filter box (300) is provided with strip-shaped flow guide grooves at diagonal positions, and a V-shaped flow guide groove is provided between the two strip-shaped flow guide grooves to connect the two strip-shaped flow guide grooves.

6. The rare earth recovery device in rare earth wastewater according to claim 1, characterized in that: The surface of the guardrail (303) is slidably connected to the inner wall of the filter box (300), and the guardrail (303) is adapted to the filter box (300). The cleaning pipe (305) is connected to the cleaning port. A slot is provided on the guardrail (303) for the blocking plate (306) to pass through, and the inner wall of the slot is in contact with the surface of the blocking plate (306). The bottom of the blocking plate (306) is in contact with the upper surface of the mesh plate (302). A bolt (307) threadedly connected to one side of the blocking plate (306) is inserted on one side of the guardrail (303).

7. The rare earth recovery device in rare earth wastewater according to claim 1, characterized in that: A nut on one side of the bolt (307) is fitted with one side of the guardrail (303), and a screw hole for threaded connection of the bolt (307) is provided on the guardrail (303).

8. The rare earth recovery device in rare earth wastewater according to claim 1, characterized in that: The supporting sliding assembly (5) comprises a sliding rail (500) installed on both sides of the bottom of the base, the inner bottom wall of the sliding groove of the sliding rail (500) is rotatably connected with a supporting roller (501) through a rotating shaft, a receiving plate (502) is arranged above the sliding rail (500), and sliding blocks (503) are fixedly installed at the four corners of the bottom of the receiving plate (502), the sliding block (503) is slidably connected to the sliding groove in the sliding rail (500), and the surface of the supporting roller (501) is rollingly connected to the lower surface of the sliding block (503), and one side of the sliding rail (500) is fixedly installed A magnet ring (504) is provided, an insertion rod (505) is inserted inside the magnet ring (504), a positioning iron plate (506) is fixedly installed on one end of the insertion rod (505), a pull ring is fixedly installed on one side of the positioning iron plate (506), one end of the insertion rod (505) passes through one of the slide rails (500) and extends into the slide groove of the slide rail (500), one end of the insertion rod (505) located inside the slide groove is plugged into one side of one of the sliding blocks (503), and the outer sides of the four sliding blocks (503) are all provided with plugging holes for the insertion rod (505) to be plugged in.

9. The rare earth recovery device in rare earth wastewater according to claim 4, characterized in that: The discharge pipe (403) is provided with a plate groove for the gate plate (405) to pass through, the inner wall of the plate groove is slidably connected to the surface of the gate plate (405), the bottom and both sides of the gate plate (405) are inlaid with rubber strips, and the side of the rubber strip away from the gate plate (405) is in contact with the inner wall of the discharge pipe (403).

10. A method for using a rare earth recovery device in rare earth wastewater according to any one of claims 1 to 9, characterized in that: The first step is to introduce rare earth wastewater into a first reactor (1), and add a sodium carbonate solution into the first reactor (1) to carry out a reaction; The second step is to introduce the wastewater after the first reaction into the first shaking and filtering mechanism (8) for the first shaking, sedimentation and filtering; The third step is to introduce the wastewater filtered out of the first shaking filter mechanism (8) into the second reactor (6), and add oxalic acid into the second reactor (6) to react again; The third step is to introduce the wastewater after the second reaction into the second shaking and filtering mechanism (9) for a second shaking, sedimentation and filtering; The fourth step is to introduce the wastewater filtered out by the second shaking filter mechanism (9) into the ion exchange box (7) and exchange it with the cation exchange resin in the ion exchange box (7), thereby exchanging the free rare earth ions; In the fifth step, the rare earth residue filtered out from the first shaking filtration mechanism (8), the second shaking filtration mechanism (9) and the ion exchange box (7) is placed in the third reactor (10), hydrochloric acid is added and filtered to obtain a leaching solution, oxalic acid is added to the leaching solution to produce oxalic acid precipitate, and the oxalic acid precipitate is roasted in a Maboise furnace to obtain rare earth oxide.

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