A flotation wastewater treatment device and scheelite recovery method

Abstract

The application provides a flotation wastewater treatment device and a scheelite recovery method, and relates to the technical field of wastewater purification. The flotation wastewater treatment device comprises a pool body, a water inlet pipe and a reagent adding pipe are arranged on the pool body respectively, a bridge frame is fixedly arranged at the top end of the pool body, and a feeding well is fixedly arranged at the bottom end of the bridge frame. The scheelite recovery method comprises the following steps: step S1, crushing and grinding; step S2, normal-temperature rough separation; step S3, concentration and reagent removal; and step S4, heating and fine separation. The self-rotation of the wastewater in the feeding well is realized by using the liquid supply power of the water inlet pipe, so that the wastewater and the reagent can be conveniently rotated and mixed; when the driving member controls the rotation and scraping of the flow guide device to push the sedimentary solid to the output port in the center of the pool body, the switch sleeve is also synchronously rotated, so that the intermittent reagent adding is facilitated, the uniformity of the mixing of the reagent and the wastewater is improved, and the waste of the reagent caused by excessive reagent adding is avoided.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification technology, and in particular to a flotation wastewater treatment device and a method for recovering scheelite. Background Technology

[0002] Flotation wastewater is a common type of industrial wastewater. If this wastewater is discharged directly, it will not only cause a large loss of valuable metal resources and reduce the overall mineral recovery rate, but also cause environmental problems such as water pollution, soil salinization, and damage to aquatic ecosystems. Therefore, it is necessary to select wastewater treatment equipment to recycle and treat flotation wastewater in order to facilitate the recycling of wastewater and save water resources.

[0003] In an existing patent application, publication number CN110342621A, a treatment device for high-concentration mineral processing wastewater with two-stage concentration and sedimentation is disclosed. This device includes a flocculation cylinder and a sedimentation tank; a rotating shaft is arranged along the axis of the flocculation cylinder, and stirring rods or stirring blades are arranged at the rotating shaft; a slurry inlet pipe and a flocculant inlet pipe are arranged at the top port of the flocculation cylinder, and the bottom port of the flocculation cylinder constitutes the discharge port; the device also includes a threaded rake frame, which can rotate around the axis of the sedimentation tank, and a vortex-shaped scraper is arranged on the side of the threaded rake frame facing the bottom end of the sedimentation tank; a cohesive cylinder is also coaxially sleeved on the outer wall of the flocculation cylinder.

[0004] Using existing wastewater treatment equipment, the reagents are continuously added through a feed pipe. While this allows the reagents to mix with the wastewater, the continuous addition of reagents before the wastewater is fully mixed can easily lead to excessive addition of reagents.

[0005] Therefore, it is necessary to provide a flotation wastewater treatment device to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a flotation wastewater treatment device that solves the problem in related technologies where continuous addition of reagents can easily lead to excessive reagent addition.

[0007] To solve the above-mentioned technical problems, the present invention provides a flotation wastewater treatment device, comprising:

[0008] The pool body is equipped with an inlet pipe and a dosing pipe.

[0009] A cable tray, which is fixed to the top of the pool body;

[0010] A feeding well is fixed at the bottom end of the bridge frame. A drainage hole is provided at the bottom end of the feeding well. A fixing plate is fixed inside the feeding well. The output end of the water inlet pipe passes through the feeding well and is interconnected with it.

[0011] The injection device includes an injection pipe, a rotating shaft, and a switch sleeve. The injection pipe is fixed to the fixed plate, and the bottom end of the rotating shaft is rotatably installed inside the injection pipe. The inner side of the switch sleeve is fixed to the rotating shaft, and the outer side of the switch sleeve is rotatably sealed to the injection pipe. The injection pipe has an injection hole, and the switch sleeve has a docking hole located within the rotation range of the injection hole. The output end of the dosing pipe passes through the feed well and the injection pipe in sequence, and the output end of the dosing pipe and the switch sleeve are vertically offset.

[0012] A driving device includes a driving component, a driving shaft, a first gear, and a second gear. The driving component is fixed on the bridge frame. The top end of the driving shaft is fixed to the driving end of the driving component. The bottom end of the driving shaft passes through the bridge frame and the feeding well in sequence and is rotatably connected. The first gear is fixed on the driving shaft. The second gear is fixed to the top end of the rotating shaft and is meshed with the first gear.

[0013] A flow guiding device is fixed to the bottom end of the drive shaft.

[0014] Preferably, at least four injection holes are provided on one of the injection tubes, and the docking holes are arranged in a one-to-one correspondence with the injection holes.

[0015] Preferably, the inner wall of the pool is provided with an overflow channel, the input end of the overflow channel is provided with a grid structure, the input end of the overflow channel is connected to the inside of the pool, and the output end of the overflow channel passes through the pool.

[0016] Preferably, the injection device further includes a pad, a piston disc, and a spring. The pad is fixed inside the injection tube, the piston disc is sleeved on the rotating shaft and slidably sealed, the piston disc and the injection tube are slidably sealed, and the two ends of the spring are fixedly connected to the injection tube and the piston disc, respectively.

[0017] Preferably, the flow guiding device includes a cross frame, a connecting frame, and multiple flow guiding inclined plates. The cross frame is fixed to the bottom end of the drive shaft, the connecting frame is fixed to the cross frame, and the multiple flow guiding inclined plates are evenly fixed to the bottom of the connecting frame. The multiple flow guiding inclined plates are distributed in parallel, and the bottom of the flow guiding inclined plates is slidably connected to the bottom wall of the pool.

[0018] Preferably, four flow guiding devices are provided, and the four flow guiding devices are arranged around the bottom end of the drive shaft.

[0019] Preferably, there are two injection devices; the number of fixing plates, injection devices and second gears are equal, and they are arranged in a one-to-one correspondence.

[0020] The output end of the dosing tube is connected to the input ends of the two injection devices via a shunt tube.

[0021] Preferably, a U-shaped frame is fixedly installed on the feeding well;

[0022] The flotation wastewater treatment device further includes a mixing device, which comprises a sleeve, a stirring rod, a third gear, a slide rod, a rack, a transmission component, a crank, and a slide frame. The sleeve is rotatably mounted on the drive shaft, the stirring rod is fixed to the sleeve, the third gear is fixed to the sleeve, the slide rod is fixed to the feed well, the rack frame is sleeved on the slide rod and slidably connected, and the rack frame is meshed with the third gear. One end of the crank is rotatably mounted on the U-shaped frame, the transmission component drives the shaft of the rotating shaft and the drive shaft of the crank, the top end of the crank is inserted into the slide frame and movably connected, and the slide frame is fixed to the rack frame.

[0023] Preferably, the transmission component may consist of two pulleys and a belt, with one pulley fixed to the rotating shaft and the other pulley fixed to the transmission shaft at the bottom of the crank, and the belt driving the two pulleys.

[0024] This invention also provides a method for recovering scheelite, comprising the following steps:

[0025] Step S1, Crushing and Grinding: The raw scheelite is crushed and ground to obtain a slurry. The particle size of the slurry is controlled so that the proportion of particles with a particle size of -0.074mm is 70% to 75%.

[0026] Step S2, room temperature roughing: Sodium carbonate is added to the pulp to adjust the pulp pH to 10-10.5, and then water glass is added as a gangue inhibitor. Fatty acid collectors are used for room temperature flotation. After roughing, scavenging and cleaning, room temperature rough concentrate is obtained.

[0027] Step S3, Concentration and Removal: Concentrate and dehydrate the crude concentrate at room temperature to reduce the residual reagent content in the slurry;

[0028] Step S4, Heating and Refinement: Add sodium hydroxide, water glass and tannin to the concentrated crude concentrate slurry, adjust the pH of the slurry to 11-12, heat the slurry temperature to 90-95℃, add oleic acid collector for heated flotation, and obtain scheelite crude concentrate through roughing, multi-stage scavenging and multi-stage refinement.

[0029] Step S5, Dehydration and Drying: The scheelite rough concentrate is fed into the flotation wastewater treatment device for concentration, then filtered and dried to obtain qualified scheelite concentrate.

[0030] Compared with related technologies, the flotation wastewater treatment device provided by the present invention has the following beneficial effects:

[0031] The wastewater in the feeding well is rotated by the liquid supply power of the inlet pipe, which facilitates the rotational mixing of wastewater and chemicals. When the drive unit controls the flow guiding device to rotate and scrape the settled solids and push them to the output port in the center of the tank, it also drives the switch sleeve to rotate simultaneously, which facilitates the intermittent addition of chemicals, improves the uniformity of the mixing of chemicals and wastewater, and avoids the waste of chemicals caused by over-dosing. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0033] Figure 1 A three-dimensional view of a first embodiment of a flotation wastewater treatment device provided by the present invention;

[0034] Figure 2 for Figure 1 A 3D view of a partial cross-section of the feed well;

[0035] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the injection tube section shown;

[0036] Figure 4 for Figure 1 The top view of the feed well section shown;

[0037] Figure 5 This is a schematic diagram of a first embodiment of a flotation wastewater treatment device provided by the present invention, wherein, Figure 5 (a) in the diagram shows the state when the switch sleeve begins to rotate. Figure 5 (b) in the diagram shows the state of the switch sleeve rotating half a turn. Figure 5 (c) in the diagram shows the state when the switch is about to open. Figure 5 (d) in the diagram represents the state where the switch sleeve is open. Figure 5 (e) in the middle is Figure 5 The distribution diagram of the piston disk in state (a) is shown. Figure 5 (f) in the middle is Figure 5 The distribution diagram of the piston disk in state (b) is shown. Figure 5 (g) in Figure 5 The distribution diagram of the piston disk in state (c) is shown. Figure 5 (h) in Figure 5 The distribution diagram of the piston disk in state (d);

[0038] Figure 6A three-dimensional view of a second embodiment of a flotation wastewater treatment device provided by the present invention;

[0039] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure of the feed well section shown;

[0040] Figure 8 for Figure 7 A schematic diagram of the crank connection section is shown.

[0041] Figure 9 This is a schematic diagram of a second embodiment of a flotation wastewater treatment device provided by the present invention, wherein, Figure 9 (a) in the diagram shows the state of the crank before it rotates. Figure 9 (b) in the diagram shows the state after the crank has rotated 90°. Figure 9 (c) in the diagram represents the state when the crank is rotated 270°.

[0042] Explanation of icon numbers:

[0043] 1. Tank body; 11. Inlet pipe; 12. Chemical dosing pipe; 13. Overflow trough;

[0044] 2. Cable trays;

[0045] 3. Feed well; 31. Drainage hole; 32. Fixing plate;

[0046] 4. Drive unit; 41. Drive component; 42. Drive shaft; 43. First gear; 44. Second gear;

[0047] 5. Flow guiding device; 51. Horizontal frame; 52. Connecting frame; 53. Flow guiding ramp;

[0048] 6. Injection device; 61. Injection pipe; 62. Rotating shaft; 63. Switch sleeve; 64. Pad; 65. Piston disc; 66. Spring; 611. Injection hole; 631. Connecting hole;

[0049] 121. Diverter pipe;

[0050] 33. U-shaped frame;

[0051] 7. Mixing device; 71. Sleeve; 72. Stirring rod; 73. Third gear; 74. Slide rod; 75. Rack and pinion; 76. Transmission component; 77. Crank; 78. Carriage.

[0052] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] 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 one aspect of the present invention, and not the entirety of the 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.

[0054] This invention provides a flotation wastewater treatment device.

[0055] First embodiment.

[0056] Please refer to the following: Figures 1 to 4 In this invention, a flotation wastewater treatment device includes:

[0057] The pool body 1 is equipped with a water inlet pipe 11 and a chemical dosing pipe 12.

[0058] Cable tray 2, which is fixed to the top of the pool body 1;

[0059] Feeding well 3 is fixed at the bottom end of the bridge frame 2. A drainage hole 31 is opened at the bottom end of the feeding well 3. A fixing plate 32 is fixed inside the feeding well 3. The output end of the water inlet pipe 11 passes through the feeding well 3 and is interconnected with it.

[0060] The injection device 6 includes an injection pipe 61, a rotating shaft 62, and a switch sleeve 63. The injection pipe 61 is fixed to the fixed plate 32. The bottom end of the rotating shaft 62 is rotatably installed inside the injection pipe 61. The inner side of the switch sleeve 63 is fixed to the rotating shaft 62, and the outer side of the switch sleeve 63 is rotatably sealed to the injection pipe 61. An injection hole 611 is provided on the injection pipe 61, and a docking hole 631 is provided on the switch sleeve 63. The docking hole 631 is located within the rotation range of the injection hole 611. The output end of the dosing pipe 12 passes through the feed well 3 and the injection pipe 61 in sequence, and the output end of the dosing pipe 12 and the switch sleeve 63 are vertically offset.

[0061] The driving device 4 includes a driving component 41, a driving shaft 42, a first gear 43, and a second gear 44. The driving component 41 is fixed on the bridge frame 2. The top end of the driving shaft 42 is fixed to the driving end of the driving component 41. The bottom end of the driving shaft 42 passes through the bridge frame 2 and the feeding well 3 in sequence and is rotatably connected. The first gear 43 is fixed on the driving shaft 42. The second gear 44 is fixed on the top end of the rotating shaft 62 and is meshed with the first gear 43.

[0062] The flow guiding device 5 is fixed at the bottom end of the drive shaft 42.

[0063] In this embodiment, the driving component 41 can be a motor structure, used to directly drive the drive shaft 42 to rotate and adjust, so as to provide power for the rotation operation of the flow guiding device 5.

[0064] When wastewater enters the feed well 3 through the inlet pipe 11, the reagent enters the feed well 3 through the dosing pipe 12, realizing the dosing and premixing of wastewater, which facilitates the dosing and mixing before the wastewater settles or flocculates.

[0065] In this embodiment, the agent can be a flocculant used for the settling of wastewater.

[0066] The bottom of the pool 1 is fixed to the ground by a bracket. The output end of the pool 1 is connected to a mud pump, which facilitates the slow pumping out of the mud collected in the pool 1.

[0067] The drainage hole 31 facilitates the downward transport of the mixed flocculation and wastewater solution in the feeding well 3, allowing the mixture to fully enter the interior of the tank 1 for subsequent stable sedimentation and separation.

[0068] like Figure 4 As shown, the output end of the water inlet pipe 11 is located at the edge of the feeding well 3. When the water inlet pipe 11 injects wastewater into the interior of the feeding well 3, the wastewater can form a swirling flow along the range of the feeding well 3, so that the wastewater flows and rotates within the range of the feeding well 3 after being injected.

[0069] The intermittent dosing principle of the injection port 611:

[0070] The drive component 41 controls the rotation of the rotating shaft 62, which in turn drives the switch sleeve 63 to rotate, and the switch sleeve 63 drives the docking hole 631 to rotate.

[0071] When the docking hole 631 is aligned with the injection hole 611, the injection hole 611 opens, and the agent is automatically sprayed into the range of the feeding well 3, so that the agent mixes with the wastewater.

[0072] When the docking hole 631 is misaligned with the injection hole 611, the injection hole 611 closes, and the injection of the agent automatically stops, which facilitates the intermittent injection of the agent.

[0073] The liquid supply power of the inlet pipe 11 is used to realize the self-rotation of the wastewater in the feeding well 3, which facilitates the rotational mixing of wastewater and chemicals. When the drive component 41 controls the flow guiding device 5 to rotate and scrape the settled solids and push them to the output port in the center of the tank 1, it also drives the switch sleeve 63 to rotate simultaneously, which facilitates the intermittent addition of chemicals, improves the uniformity of the mixing of chemicals and wastewater, and avoids the waste of chemicals caused by excessive addition.

[0074] It facilitates continuous treatment of flotation wastewater, improves wastewater treatment efficiency, and increases the full utilization rate of reagents.

[0075] Please refer to it again. Figure 3 At least four injection holes 611 are provided on one of the injection tubes 61, and the docking holes 631 are arranged in a one-to-one correspondence with the injection holes 611.

[0076] The four injection holes 611 are arranged vertically to increase the range of injection and make the drug distribution more uniform.

[0077] Please refer to it again. Figure 1 An overflow channel 13 is provided on the inner wall of the pool body 1. A grid structure is provided at the input end of the overflow channel 13. The input end of the overflow channel 13 is connected to the inside of the pool body 1. The output end of the overflow channel 13 passes through the pool body 1.

[0078] The grid structure on the overflow trough 13 facilitates the overflow water after sedimentation and separation in the pool 1 to first enter the interior of the overflow trough 13, and then be transported and discharged outward through the output end of the overflow trough 13.

[0079] Please refer to the following: Figure 2 and Figure 3 The injection device 6 further includes a pad 64, a piston disc 65, and a spring 66. The pad 64 is fixed inside the injection tube 61. The piston disc 65 is sleeved on the rotating shaft 62 and is slidably sealed. The piston disc 65 and the injection tube 61 are slidably sealed. The two ends of the spring 66 are fixedly connected to the injection tube 61 and the piston disc 65, respectively.

[0080] In this embodiment, the top of the injection tube 61 is provided with an opening structure to support the lifting and lowering adjustment of the piston disc 65 and ensure the stable adjustment of the piston disc 65.

[0081] The piston disc 65 is slidably sealed between the rotating shaft 62 and the injection tube 61, so that the up and down movement of the piston disc 65 does not affect the sealing of the drug addition in the injection tube 61.

[0082] The pad 64 provides a limiting and supporting function for the vertical movement of the piston disc 65;

[0083] See also Figure 5 (d) and Figure 5 In (h), when the docking hole 631 is aligned and connected with the injection hole 611, the injection hole 611 is opened, and under the elastic pressure of the spring 66, the bottom of the piston disc 65 abuts against the pad block 64.

[0084] See also Figure 5 (b) and Figure 5In (f), when the docking hole 631 and the injection hole 611 are misaligned, the injection hole 611 is closed, and the dosing pipe 12 continuously injects the agent into the injection pipe 61, so that the agent is continuously pressurized in the injection pipe 61. When the hydraulic pressure increases, it pushes the piston disc 65 to move upward and compresses the spring 66, which facilitates adaptive pressurization before the agent is added to the wastewater.

[0085] When the drive shaft 42 drives the second gear 44 to rotate synchronously through the first gear 43, the rotating shaft 62 drives the switch sleeve 63 to rotate, and the switch sleeve 63 drives the docking hole 631 to rotate, so that the injection hole 611 switches intermittently.

[0086] When the injection port 611 is closed, the hydraulic pressure of the drug in the injection tube 61 increases, adaptively pushing the piston disc 65 to slide upward;

[0087] When the injection hole 611 is opened, the spring 66 pushes the piston disc 65 downward, so that the pressurized medicine is quickly sprayed out from the injection hole 611.

[0088] It facilitates adaptive pressurization of the reagent during intermittent dosing, thereby increasing the mixing and contact range between the reagent and wastewater during addition.

[0089] Please refer to it again. Figure 2 The flow guiding device 5 includes a horizontal frame 51, a connecting frame 52, and multiple flow guiding inclined plates 53. The horizontal frame 51 is fixed to the bottom end of the drive shaft 42, the connecting frame 52 is fixed to the horizontal frame 51, and the multiple flow guiding inclined plates 53 are evenly fixed to the bottom of the connecting frame 52. The multiple flow guiding inclined plates 53 are distributed in parallel, and the bottom of the flow guiding inclined plates 53 is slidably connected to the bottom wall of the pool body 1.

[0090] The crossbeam 51 is configured to provide stable support for the connecting frame 52 and multiple guide ramps 53.

[0091] Multiple guide plates 53 are inclined and spaced apart from each other. When the drive shaft 42 rotates, the cross frame 51, the connecting frame 52 and the multiple guide plates 53 rotate synchronously. The multiple guide plates 53 rotate and scrape along the bottom wall of the pool body 1, so that the settled solids are slowly transported towards the outlet of the pool body 1 under the scraping action, providing support for the slow discharge of settled solids through the outlet of the pool body 1.

[0092] Please refer to it again. Figure 2 Four flow guiding devices 5 are provided, and the four flow guiding devices 5 are arranged around the bottom end of the drive shaft 42.

[0093] The four flow guiding devices 5 distributed around the bottom of the drive shaft 42 rotate synchronously when the drive shaft 42 is driven to rotate by the drive component 41, which facilitates the simultaneous scraping and maintenance of the bottom wall of the pool 1 in four directions; thus improving the efficiency of solid sedimentation flow at the bottom wall of the pool 1.

[0094] The working principle of the flotation wastewater treatment device provided in this embodiment is as follows:

[0095] Let's define it as follows: In the initial state, mixed wastewater is injected into pool 1, and the mixed wastewater gradually settles and separates within pool 1.

[0096] The inlet pipe 11 continuously injects wastewater into the feed well 3;

[0097] The dosing tube 12 continuously injects the drug into the injection tube 61;

[0098] A1, Rotate the scraper and start the drive unit 41. The drive unit 41 drives the cross frame 51 to rotate through the drive shaft 42. The cross frame 51 drives the guide plate 53 to rotate through the connecting frame 52. When the guide plate 53 rotates, it slowly scrapes the bottom wall of the pool body 1, so that the settled solids are guided and pushed along the bottom wall of the pool body 1 to the outlet of the pool body 1.

[0099] A2, mud output: The settling solids in the outlet of tank 1 are slowly pumped out by the configured mud pump to facilitate the continuous and slow output of the settling solids.

[0100] A3, Wastewater injection: Wastewater is continuously injected into the feed well 3 through the inlet pipe 11, so that after the wastewater enters the feed well 3, it forms a vortex under the action of water flow power;

[0101] A4, intermittent drug addition, the drive shaft 42 synchronously drives the second gear 44 to rotate through the first gear 43, and the second gear 44 drives the switch sleeve 63 to rotate through the rotating shaft 62;

[0102] Please refer to the following: Figure 5 (a) to Figure 5 (b) to Figure 5 (c) and Figure 5 (e) to Figure 5 (f) to Figure 5 In (g), when the switch sleeve 63 causes the docking hole 631 to separate from the injection hole 611, the injection hole 611 is closed, the medicine in the injection tube 61 is continuously injected and pressurized, and after the medicine is pressurized, it pushes the piston plate 65 to slide upward. The piston plate 65 moves upward and compresses the spring 66, providing a buffer for the continuously injected medicine.

[0103] Figure 5 (c) to Figure 5 (d) and Figure 5 (g) to Figure 5 In the (h) section, when the switch sleeve 63 drives the docking hole 631 to align with the injection hole 611, the injection hole 611 opens, and the pressurized agent in the injection pipe 61 is quickly sprayed into the interior of the feed well 3, so that the agent and wastewater are quickly mixed.

[0104] Ultimately, while the drive unit 41 controls the flow guiding device 5 to guide and push the sedimented solids in the pool 1, it also simultaneously realizes the adaptive switching of the injection hole 611 and the automatic pressurization of the agent, thereby improving the mixing efficiency of the agent and wastewater.

[0105] Second embodiment.

[0106] Please refer to the following: Figures 6 to 7 Based on the flotation wastewater treatment apparatus provided in the first embodiment of the present invention, the second embodiment of the present invention proposes another flotation wastewater treatment apparatus. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0107] Specifically, the difference in the flotation wastewater treatment device provided in the second embodiment of the present invention is that two liquid injection devices 6 are provided; the number of fixed plates 32, liquid injection devices 6 and second gears 44 are equal and arranged in a one-to-one correspondence;

[0108] The output end of the dosing tube 12 is connected to the input ends of the two injection devices 6 through a shunt tube 121.

[0109] The drug continuously delivered in the dosing tube 12 first enters the interior of the diversion tube 121, and after being diverted and delivered by the diversion tube 121, it enters the interiors of the two injection tubes 61 respectively.

[0110] When the drive shaft 42 rotates, it can simultaneously drive two second gears 44 to rotate through the first gear 43, thereby providing rotational power for the intermittent dosing and pressurized spraying of the two injection devices 6.

[0111] By increasing the number of injection devices 6, it is convenient to add the reagent from different directions, thereby improving the mixing efficiency of wastewater and reagent and improving wastewater treatment efficiency.

[0112] Please refer to the following: Figures 7 to 8 A U-shaped frame 33 is fixedly installed on the feeding well 3;

[0113] The flotation wastewater treatment device further includes a mixing device 7, which includes a sleeve 71, a stirring rod 72, a third gear 73, a slide rod 74, a rack frame 75, a transmission component 76, a crank 77, and a slide 78. The sleeve 71 is rotatably mounted on the drive shaft 42, the stirring rod 72 is fixed on the sleeve 71, the third gear 73 is fixed on the sleeve 71, the slide rod 74 is fixed on the feed well 3, the rack frame 75 is sleeved on the slide rod 74 and slidably connected, and the rack frame 75 is meshed with the third gear 73. One end of the crank 77 is rotatably mounted on the U-shaped frame 33, the transmission component 76 drives the drive shaft of the rotating shaft 62 and the crank 77, the top end of the crank 77 is inserted into the slide 78 and movably connected, and the slide 78 is fixed on the rack frame 75.

[0114] The U-shaped bracket 33 is arranged around the outside of the injection tube 61 to provide stable support for the installation and rotation of the crank 77.

[0115] In this embodiment, the crank 77 consists of two drive shafts and a drive rod, with one drive shaft fixed to the bottom of one end of the drive rod and the other drive shaft fixed to the top of the other end of the drive rod.

[0116] "Active connection" means that when the crank 77 rotates, the drive shaft at the top of the crank 77 is inserted into the interior of the carriage 78 and slidably connected; the reciprocating push of the carriage 78 is achieved by the circular motion of the crank 77.

[0117] The reciprocating stirring principle of the stirring rod 72 is as follows:

[0118] like Figure 9 As shown, when the shaft 62 rotates, the transmission component 76 synchronously drives the crank 77 to rotate clockwise;

[0119] from Figure 9 (a) to Figure 9 In (b), when the crank 77 rotates from 0° to 90°, the slide 78 drives the rack 75 to move down, the rack 75 drives the third gear 73 to rotate counterclockwise, the third gear 73 drives the sleeve 71 and the stirring rod 72 to rotate counterclockwise, and the stirring rod 72 stirs the wastewater and medicine in the feed well 3 counterclockwise.

[0120] from Figure 9 (b) to Figure 9 In (c), when the crank 77 rotates from 90° to 270°, the slide 78 drives the rack 75 to move upward, the rack 75 drives the third gear 73 to rotate clockwise, the third gear 73 drives the sleeve 71 and the stirring rod 72 to rotate clockwise, and the stirring rod 72 stirs the wastewater and medicine in the feed well 3 clockwise.

[0121] Similarly, from Figure 9 (c) to Figure 9 In (a), when the crank 77 rotates from 270° to 360° (which can also be understood as 0°), the slide 78 drives the rack frame 75 to move down, the rack frame 75 drives the third gear 73 to rotate counterclockwise, the third gear 73 drives the sleeve 71 and the stirring rod 72 to rotate counterclockwise, and the stirring rod 72 stirs the wastewater and reagents in the feed well 3 counterclockwise.

[0122] Finally, as the crank 77 rotates synchronously with the shaft 62, the stirring rod 72 can rotate clockwise and counterclockwise in a reciprocating motion to improve the mixing efficiency of wastewater and reagents.

[0123] Under the driving action of the driving component 41, not only can the rotating sludge scraping of the flow guiding device 5 be realized, but also the pressurized intermittent injection of the agent can be realized, and the reciprocating swing of the stirring rod 72 can be realized to reciprocate the stirring and mixing of wastewater and agent in the feeding well 3, thereby improving the premixing efficiency of wastewater and agent.

[0124] In an optional embodiment of this example, the transmission component 76 may consist of two pulleys and a belt, with one pulley fixed to the rotating shaft 62 and the other pulley fixed to the transmission shaft at the bottom of the crank 77. The belt drives the two pulleys to rotate synchronously so that the rotating shaft 62 can drive the crank 77 to rotate synchronously.

[0125] In another optional embodiment of this example, the transmission component 76 may consist of two sprockets and a chain, with one sprocket fixed to the rotating shaft 62 and the other sprocket fixed to the transmission shaft at the bottom of the crank 77, and the chain drivingly connecting the two sprockets; so that the rotating shaft 62 can drive the crank 77 to rotate synchronously.

[0126] The working principle of a flotation wastewater treatment device provided in this embodiment is as follows:

[0127] B1, the two injection devices 6 administer the drug simultaneously:

[0128] The agent is introduced into the inside of the diversion pipe 121 through the dosing pipe 12. After the agent enters the inside of the injection pipe 61, the agent in the injection pipe 61 is pressurized and buffered. The pressurized and buffered agent is injected into the wastewater from two directions through the connecting hole 631 and the injection hole 611, so that the agent comes into more complete contact with the wastewater during injection.

[0129] B2, reciprocating mixing operation:

[0130] During the process of the drive shaft 42 driving the flow guiding device 5 to rotate as a whole, it not only drives the rotating shaft 62 to rotate at the same time;

[0131] The rotating shaft 62 also drives the crank 77 to rotate via the transmission component 76. The crank 77 drives the slide 78 to move back and forth. The slide 78 drives the third gear 73 to rotate forward and reverse in a reciprocating manner via the rack frame 75. The third gear 73 drives the sleeve 71 and the stirring rod 72 to rotate synchronously. The stirring rod 72 reciprocates in a forward and reverse manner to stir and mix the wastewater and the agent, thereby improving the stirring efficiency of the agent.

[0132] In one application scenario of this solution, the flotation wastewater treatment device can be used for the sedimentation treatment of mineral processing wastewater. By efficiently pre-mixing the wastewater and reagents, it helps to improve the sedimentation efficiency of the wastewater, facilitates the purification and recycling of flotation wastewater, and realizes the recycling of water resources.

[0133] In another application scenario of this solution, the flotation wastewater treatment device can be used for the deep treatment of industrial wastewater. By fully mixing the wastewater with the reagent and allowing it to settle slowly, the solid-liquid separation of mud and powder in the wastewater is achieved, realizing the recycling of water resources and saving industrial water.

[0134] In another application scenario of this solution, the flotation wastewater treatment device can be used for the treatment of sewage in lakes or rivers. By mixing sewage with flocculants, the flocs are collected and settled. Adding water treatment agents can also remove phosphorus and improve water transparency and water quality.

[0135] The present invention also provides a method for recovering scheelite.

[0136] A method for recovering scheelite includes the following steps:

[0137] Step S1, Crushing and Grinding: The raw scheelite is crushed and ground to obtain a slurry. The particle size of the slurry is controlled so that the proportion of particles with a particle size of -0.074mm is 70% to 75%.

[0138] Step S2, room temperature roughing: Sodium carbonate is added to the pulp to adjust the pulp pH to 10-10.5, and then water glass is added as a gangue inhibitor. Fatty acid collectors are used for room temperature flotation. After roughing, scavenging and cleaning, room temperature rough concentrate is obtained.

[0139] Step S3, Concentration and Removal: Concentrate and dehydrate the crude concentrate at room temperature to reduce the residual reagent content in the slurry;

[0140] Step S4, Heating and Refinement: Add sodium hydroxide, water glass and tannin to the concentrated crude concentrate slurry, adjust the pH of the slurry to 11-12, heat the slurry temperature to 90-95℃, add oleic acid collector for heated flotation, and obtain scheelite crude concentrate through roughing, multi-stage scavenging and multi-stage refinement.

[0141] Step S5, dehydration and drying: After the scheelite crude concentrate is injected into the flotation wastewater treatment device for concentration, it is then filtered and dried to obtain qualified scheelite concentrate.

[0142] In step S2, the amount of sodium carbonate used is 1000-1500 g / t, and the total amount of water glass used is 2000-5000 g / t.

[0143] In step S2, during the ambient temperature flotation process, the scavenging froth is returned to the roughing operation, and the middlings of the selected ore are sequentially returned to the next stage of the cleaning operation.

[0144] In step S4, the dosage of sodium sulfide is 300-800 g / t, the dosage of sodium hydroxide is 500-1000 g / t, the dosage of water glass is 5000-8000 g / t, the dosage of tannin is 50-150 g / t, and the dosage of oleic acid is 500-1200 g / t.

[0145] In step S4, the heating and cleaning process adopts a flotation process of 1 roughing, 3-4 scavenging, and 3-5 cleaning. The scavenging tailings are combined and discharged, while the cleaning middlings are returned sequentially.

[0146] Before heating and flotation in step S4, the slurry is stirred and activated for 10 to 30 minutes.

[0147] In step S5, the filtration is carried out using a filter press, and the WO3 grade in the dried scheelite concentrate is not less than 65%.

[0148] The combined process of ambient temperature roughing and heated cleaning can efficiently recover coarse and fine-grained scheelite, with high tungsten recovery rate, stable concentrate grade, lower reagent and energy consumption, stable and environmentally friendly process, and strong industrial applicability.

[0149] The specific structure of the flotation wastewater treatment device is as described in the above embodiments. Since the scheelite recovery method adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0150] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A flotation wastewater treatment device, characterized in that, include: The pool body is equipped with an inlet pipe and a dosing pipe. A cable tray, which is fixed to the top of the pool body; A feeding well is fixed at the bottom end of the bridge frame. A drainage hole is provided at the bottom end of the feeding well. A fixing plate is fixed inside the feeding well. The output end of the water inlet pipe passes through the feeding well and is interconnected with it. The injection device includes an injection pipe, a rotating shaft, and a switch sleeve. The injection pipe is fixed to the fixed plate, and the bottom end of the rotating shaft is rotatably installed inside the injection pipe. The inner side of the switch sleeve is fixed to the rotating shaft, and the outer side of the switch sleeve is rotatably sealed to the injection pipe. The injection pipe has an injection hole, and the switch sleeve has a docking hole located within the rotation range of the injection hole. The output end of the dosing pipe passes through the feed well and the injection pipe in sequence, and the output end of the dosing pipe and the switch sleeve are vertically offset. A driving device includes a driving component, a driving shaft, a first gear, and a second gear. The driving component is fixed on the bridge frame. The top end of the driving shaft is fixed to the driving end of the driving component. The bottom end of the driving shaft passes through the bridge frame and the feeding well in sequence and is rotatably connected. The first gear is fixed on the driving shaft. The second gear is fixed to the top end of the rotating shaft and is meshed with the first gear. A flow guiding device is fixed to the bottom end of the drive shaft.

2. The flotation wastewater treatment device according to claim 1, characterized in that, The injection tube has at least four injection holes, and the docking holes are arranged in a one-to-one correspondence with the injection holes.

3. The flotation wastewater treatment device according to claim 1, characterized in that, An overflow channel is provided on the inner wall of the pool. A grid structure is provided at the input end of the overflow channel. The input end of the overflow channel is connected to the inside of the pool, and the output end of the overflow channel passes through the pool.

4. The flotation wastewater treatment device according to claim 1, characterized in that, The injection device further includes a pad, a piston disc, and a spring. The pad is fixed inside the injection tube. The piston disc is sleeved on the rotating shaft and slidably sealed. The piston disc and the injection tube are slidably sealed. The two ends of the spring are fixedly connected to the injection tube and the piston disc, respectively.

5. The flotation wastewater treatment device according to claim 1, characterized in that, The flow guiding device includes a horizontal frame, a connecting frame, and multiple flow guiding inclined plates. The horizontal frame is fixed to the bottom end of the drive shaft, the connecting frame is fixed to the horizontal frame, and the multiple flow guiding inclined plates are evenly fixed to the bottom of the connecting frame. The multiple flow guiding inclined plates are distributed in parallel, and the bottom of the flow guiding inclined plates is slidably connected to the bottom wall of the pool.

6. The flotation wastewater treatment device according to claim 5, characterized in that, The flow guiding device is provided in four parts, which are arranged around the bottom end of the drive shaft.

7. The flotation wastewater treatment device according to claim 4, characterized in that, Two liquid injection devices are provided; the number of the fixing plate, the liquid injection device and the second gear are equal and they are arranged in a one-to-one correspondence. The output end of the dosing tube is connected to the input ends of the two injection devices via a shunt tube.

8. The flotation wastewater treatment device according to claim 7, characterized in that, A U-shaped frame is fixedly installed on the feeding well; The flotation wastewater treatment device further includes a mixing device, which comprises a sleeve, a stirring rod, a third gear, a slide rod, a rack, a transmission component, a crank, and a slide frame. The sleeve is rotatably mounted on the drive shaft, the stirring rod is fixed to the sleeve, the third gear is fixed to the sleeve, the slide rod is fixed to the feed well, the rack frame is sleeved on the slide rod and slidably connected, and the rack frame is meshed with the third gear. One end of the crank is rotatably mounted on the U-shaped frame, the transmission component drives the shaft of the rotating shaft and the drive shaft of the crank, the top end of the crank is inserted into the slide frame and movably connected, and the slide frame is fixed to the rack frame.

9. The flotation wastewater treatment device according to claim 8, characterized in that, The transmission component can consist of two pulleys and a belt, with one pulley fixed to the rotating shaft and the other pulley fixed to the drive shaft at the bottom of the crank, and the belt drive connecting the two pulleys.

10. A method for recovering scheelite, characterized in that, Includes the following steps: Step S1, Crushing and Grinding: The raw scheelite is crushed and ground to obtain a slurry. The particle size of the slurry is controlled so that the proportion of particles with a particle size of -0.074mm is 70% to 75%. Step S2, room temperature roughing: Sodium carbonate is added to the pulp to adjust the pulp pH to 10-10.5, and then water glass is added as a gangue inhibitor. Fatty acid collectors are used for room temperature flotation. After roughing, scavenging and cleaning, room temperature rough concentrate is obtained. Step S3, Concentration and Removal: Concentrate and dehydrate the crude concentrate at room temperature to reduce the residual reagent content in the slurry; Step S4, Heating and Refinement: Add sodium hydroxide, water glass and tannin to the concentrated crude concentrate slurry, adjust the pH of the slurry to 11-12, heat the slurry temperature to 90-95℃, add oleic acid collector for heated flotation, and obtain scheelite crude concentrate through roughing, multi-stage scavenging and multi-stage refinement. Step S5, dehydration and drying: After the scheelite crude concentrate is concentrated in the flotation wastewater treatment device according to any one of claims 1-9, it is then filtered and dried to obtain qualified scheelite concentrate.

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