Phosphorus enrichment system and process

Abstract

The invention relates to the technical field of phosphorus enrichment, in particular to a phosphorus enrichment system and technology.The phosphorus enrichment system comprises a bin body, a material collecting sleeve is vertically inserted into the bin body, a center shaft is vertically and rotationally inserted into the material collecting sleeve, and the center shaft is synchronously and rotationally sleeved with an impeller; a material collecting channel is formed between the central shaft and the material collecting sleeve; the impeller is provided with an odd number of blades, the blade located in the middle is fixedly connected with the center shaft, a first elastic piece is connected between every two adjacent blades, and each blade is of an annular wave structure. An upper blocking sleeve is arranged on the material collecting sleeve, an upper protrusion is arranged on the upper blocking sleeve, a lower blocking barrel is arranged on the bin body, a lower protrusion is arranged on the lower blocking barrel, and the upper blocking sleeve and the lower blocking barrel can slide in the vertical direction so as to change the axial height of the impeller and improve adaptability. The upper blocking sleeve, the upper protrusion, the lower blocking sleeve and the lower protrusion can be matched with the two blades located on the outermost side in a blocking mode, so that radial pulse type flowing is formed.

Description

Technical Field

[0001] This invention relates to the field of phosphorus enrichment technology, and in particular to a phosphorus enrichment system and process. Background Technology

[0002] As the most widely used battery materials, iron phosphate and lithium iron phosphate are closely related to the quality of raw materials used in their preparation. Phosphorus plays a crucial role in the crystal structure and electrochemical properties of these two materials, constructing a stable framework and ensuring efficient ion transport, making it a key component determining battery energy density and cycle life. Therefore, obtaining high-purity, highly active phosphorus-containing raw materials is a fundamental step in the entire production chain of iron phosphate and lithium iron phosphate preparation, directly impacting the quality and performance of subsequent battery products.

[0003] In the process of extracting effective phosphorus components from phosphorus-containing raw materials, the treatment of the phosphorus-containing slurry is one of the core steps, and the flotation machine is the key equipment for realizing this step. It separates the phosphorus-containing substances from the slurry through physicochemical action, thereby enriching phosphorus elements and providing qualified phosphorus-containing intermediates for subsequent preparation processes. Related technologies, such as Chinese patent CN223288244U, disclose an SF-type flotation machine for phosphoric acid beneficiation. This SF-type flotation machine for phosphoric acid beneficiation solves the problems of low air intake and high energy consumption by improving the structure of the SF-type flotation machine, including the design of the air distributor and backward-inclined blades.

[0004] However, when existing flotation machines extract phosphorus-containing substances from phosphorus-containing slurries, on the one hand, the axial height of their impellers is fixed, resulting in a fixed shear mixing range and slurry circulation flow range. When it is necessary to change the shear mixing range and slurry circulation flow range, impellers with different axial dimensions need to be replaced, which is cumbersome and has poor adaptability. On the other hand, after the impeller rotates smoothly, the flow field formed by it and the slurry is relatively fixed, which not only easily leads to dead flow zones, but also limits the collision efficiency and probability of bubbles and phosphorus-containing particles, affecting phosphorus enrichment. Summary of the Invention

[0005] Therefore, it is necessary to provide a phosphorus enrichment system and process to address the problems of poor adaptability and low phosphorus enrichment efficiency of current flotation machines.

[0006] The above objectives are achieved through the following technical solutions: A phosphorus enrichment system and process, wherein the phosphorus enrichment system includes: The silo is configured to receive phosphorus-containing slurry; The foam scraping assembly is configured to scrape out the foam formed inside the chamber. The material collection sleeve is vertically inserted into the silo body; The central shaft is vertically inserted into the collecting sleeve and can rotate around its own axis; The impeller is sleeved on the central shaft and can rotate synchronously with the central shaft; a material collection channel is formed between the central shaft and the material collection sleeve, and the material collection channel is connected to the bin body and the impeller, and is configured to receive air from the outside and phosphorus-containing slurry from the bin body, and to guide both to the impeller; the impeller has an odd number of blades, which are arranged vertically, and the blade in the middle is fixedly connected to the central shaft. A first elastic element is connected between adjacent blades. Under the action of the first elastic element, all blades except the blade in the middle can slide elastically in the vertical direction. The blades have a ring-shaped wave structure. The upper sleeve is set at the bottom of the collecting sleeve and sleeved on the outer periphery of the central shaft. The bottom of the upper sleeve is provided with at least one upper protrusion. The bottom of the upper sleeve and the upper protrusion can form a stop engagement with the uppermost blade. The upper sleeve can slide in the vertical direction and the position after sliding can be locked. The lower baffle is located at the bottom of the chamber and is sleeved on the outer periphery of the central shaft. The inner bottom of the lower baffle has at least one lower protrusion, which is corresponding to the upper protrusion. The inner bottom of the lower baffle and the lower protrusion can both form a stop with the blade located at the bottommost position. The lower baffle can slide vertically, and its position after sliding can be locked.

[0007] Furthermore, the bottom of the hopper is provided with multiple first guide plates, which are arranged at circumferential intervals along the central axis; the first guide plates are vertically arranged and extend radially along the central axis.

[0008] Furthermore, the bottom of the hopper is provided with multiple second guide vanes, which are vertically arranged and spaced apart circumferentially along the central axis, alternating with the first guide vane. The multiple second guide vanes can rotate synchronously around the axis of the central axis, and have corresponding first and second positions before and after rotation. When in the first position, the second guide vane and the first guide vane are closely attached. When in the second position, the second guide vane and the first guide vane are spaced apart and extend radially along the central axis. When the distance between adjacent blades decreases, the second guide vane switches from the first position to the second position.

[0009] Furthermore, an upper end cover is slidably sleeved on the upper sleeve; a lower end cover is slidably sleeved on the lower sleeve. The lower end cover and the upper end cover are spaced apart and vertically connected by multiple support rods. The multiple support rods are arranged circumferentially along the central axis. Each support rod is sleeved with multiple third guide plates. The multiple third guide plates on the same support rod are arranged circumferentially along the extension direction of the support rod. The third guide plates are configured to guide airflow in the radial direction along the central axis.

[0010] Furthermore, multiple third guide vanes on the same support rod are arranged alternately from bottom to top.

[0011] Furthermore, the third guide vane can rotate around the support rod; all support rods can slide synchronously in the vertical direction; the lowest third guide vane on each support rod forms a helical engagement with the support rod, and the other third guide vanes are connected to the lower third guide vane through the second elastic element. Under the action of the second elastic element, when the lower third guide vane rotates, the upper guide vane can rotate accordingly; when the distance between adjacent blades decreases, the third guide vane begins to rotate.

[0012] Furthermore, the phosphorus enrichment system also includes a drive cylinder with its output shaft facing upwards and a mounting plate fixedly mounted at its end; all the second guide plates are mounted together on the first support ring, which is sleeved on the mounting plate and can rotate around its own axis. A spiral groove is provided on the inner circumferential wall of the first support ring, and a spiral protrusion is provided on the circumferential side wall of the mounting plate. The spiral protrusion is slidably inserted into the spiral groove, so that the first support ring and the mounting plate form a spiral fit.

[0013] Furthermore, the second elastic element is a coil spring.

[0014] Furthermore, the first elastic element is an elastic washer, which is sleeved on the central shaft and abuts between two adjacent blades.

[0015] The present invention also provides a phosphorus enrichment process, employing a phosphorus enrichment system, the phosphorus enrichment process comprising the following steps: S1. Adjust the positions of the upper and lower baffles according to the required shear mixing range and slurry circulation flow range. The larger the required shear mixing range and slurry circulation flow range, the larger the distance between the upper and lower baffles. S2. Add the phosphorus-containing slurry into the silo; S3 drives the central shaft to rotate, and the central shaft synchronously drives the impeller to rotate, creating a negative pressure in the collection channel. Under the action of pressure difference, the outside air and the phosphorus-containing slurry in the bin enter the collection channel and then flow to the impeller. At the same time, under the stop of the upper sleeve, upper protrusion, lower sleeve and lower protrusion, the distance between adjacent blades increases and decreases periodically, so that the air and phosphorus-containing slurry between adjacent blades form a radial pulse flow. Then the air forms bubbles, and the bubbles float up while accumulating phosphorus-containing substances, and finally rise to the surface of the phosphorus-containing slurry to form a foam layer. S4. The foam is scraped out of the tank body by the foam scraper assembly.

[0016] The beneficial effects of this invention are: This invention relates to a phosphorus enrichment system and process. The impeller has an odd number of blades, with adjacent blades connected by a first elastic element. An upper and lower baffle sleeve are provided to cooperate with these blades. Utilizing the vertical sliding capability of the upper and lower baffle sleeves and their ability to form a stop with the outermost blades, the positions of the upper and lower baffle sleeves can be adjusted according to the required shear mixing range and slurry circulation range, thereby adjusting the axial height of the impeller and improving adaptability. Furthermore, by providing an upper protrusion on the upper baffle sleeve and a lower protrusion on the lower baffle sleeve, both of which can form a stop with the outermost blades, the spacing between adjacent blades periodically increases and decreases during impeller rotation. This creates a radial pulsed flow of air and phosphorus-containing slurry between adjacent blades, breaking the stable flow field and causing air and phosphorus-containing slurry to flow at different speeds, increasing the velocity difference between the phases. This not only improves the uniformity of three-phase mixing but also increases the collision probability of bubbles and phosphorus-containing particles, enhancing flotation capability.

[0017] Furthermore, by setting a second guide plate and utilizing its ability to rotate around the central axis, when the distance between adjacent blades decreases, the second guide plate switches from the first position to the second position, causing the mixture to be divided into more independent parts along the circumference. This further increases the shear strength while ensuring the stability of subsequent bubble rise.

[0018] Furthermore, by setting multiple third guide plates on the same support rod in a staggered manner from bottom to top, and utilizing their guiding characteristics, the turbulence effect is improved. Attached Figure Description

[0019] Figure 1 A three-dimensional structural schematic diagram of the phosphorus enrichment system provided in an embodiment of the present invention; Figure 2 An exploded view of the components of the phosphorus enrichment system provided in an embodiment of the present invention; Figure 3 This is a front view of a portion of the phosphorus enrichment system provided in an embodiment of the present invention during assembly. Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure; Figure 5 for Figure 4 A magnified schematic diagram of the structure at point Z in the middle; Figure 6 for Figure 3 Exploded view of the parts; Figure 7 An exploded view of the central shaft and impeller of the phosphorus enrichment system provided in an embodiment of the present invention; Figure 8An exploded view of the third guide plate and coil spring of the phosphorus enrichment system provided in an embodiment of the present invention. Figure 9 A three-dimensional cross-sectional view of a portion of the phosphorus enrichment system provided in an embodiment of the present invention during assembly. Figure 10 An exploded view of a portion of the structure of a phosphorus enrichment system provided in an embodiment of the present invention; Figure 11 This is an exploded view of the upper baffle sleeve, lower baffle sleeve, and the two outermost blades of the phosphorus enrichment system provided in an embodiment of the present invention.

[0020] in: 1. Bin body; 101. First support rod; 102. First mounting plate; 2. Scraper assembly; 201. Center rod; 202. Support plate; 203. Scraper; 204. First drive motor; 205. Reducer; 206. First pulley; 207. Second pulley; 208. First transmission belt; 3. Collecting sleeve; 301. Air inlet pipe; 302. Feed inlet; 303. Rib plate; 304. Second mounting plate; 4. Central shaft; 5. Impeller; 501. Blade; 5011. First through hole; 5012. Base tube; 5013. Guide rod; 502. Elastic retaining ring; 6. Upper retaining sleeve; 601. Second insertion hole; 602. Upper protrusion; 7. Lower retaining sleeve; 701. Third insertion hole; 702. Lower protrusion; 8. First guide plate; 9. Second guide plate; 901. First support ring; 9011. Spiral groove; 10. Upper end cover; 11. Lower end cover; 1101. Fixing tube; 1102. Second support rod; 1103. Second support ring; 1104. Second through hole; 12. Support rod; 1201. Third support ring; 12011. Guide post; 13. Third guide plate; 1301. Insertion tube; 14. Coil spring; 15. Drive cylinder; 1501. Mounting plate; 15011. Spiral protrusion; 15012. Guide sleeve; 16. Drive assembly; 1601. Second drive motor; 1602. Third pulley; 1603. Second transmission belt; 1604. Fourth pulley; 17. Fixing sleeve; 1701. Fourth insertion hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0022] The following reference Figures 1 to 11 The phosphorus enrichment system provided in the embodiments of the present invention is described in this paper. It is particularly suitable for enriching phosphorus, and of course, it is also suitable for enriching other elements.

[0023] Specifically, the phosphorus enrichment system includes a silo 1 with an open top for receiving phosphorus-containing slurry. A skimmer assembly 2 is installed at the top of the silo 1 to skim off the foam formed inside the silo 1. A collecting sleeve 3 is vertically inserted inside the silo 1. When the collecting sleeve 3 is long, it can be divided into multiple sub-sleeves along the axial direction, which facilitates transportation and processing. Adjacent sub-sleeves can be fixedly connected by flanges and fasteners such as bolts and nuts. A central shaft 4 is vertically inserted inside the collecting sleeve 3. The central shaft 4 is rotatably connected to the collecting sleeve 3 through bearings, allowing it to rotate around its own axis. An impeller 5 is fixedly sleeved on the central shaft 4. The impeller 5 is located below the collecting sleeve 3 and is submerged in the phosphorus-containing slurry during use. The rotation of the impeller 5 drives the phosphorus-containing slurry. The central shaft 4 and the collecting sleeve 3 are spaced apart, forming a collecting channel between them.

[0024] When the impeller 5 rotates, the inside of the collection channel is under negative pressure. Taking the collection sleeve 3 as an example, which is divided into two sub-cylinders along the axial direction, an air inlet pipe 301 is fixed and connected to the outer peripheral wall of the lower sub-cylinder. The air inlet pipe 301 has an L-shaped structure, with the end away from the lower sub-cylinder facing upwards. During use, it is positioned above the surface of the phosphorus-containing slurry to facilitate the introduction of air into the collection channel. The air entering the collection channel moves downwards to the impeller 5, then forms bubbles, and under the drive of the impeller 5, bubbles spread around the perimeter. The phosphorus-containing substances are enriched as the bubbles rise to the surface of the phosphorus-containing slurry, eventually forming a foam layer. An inlet 302 is provided on the outer peripheral wall of the lower cylinder, which is connected to the collection channel and submerged in the phosphorus-containing slurry. This facilitates the introduction of the phosphorus-containing slurry into the collection channel. The phosphorus-containing slurry that enters the collection channel then moves downward to the impeller 5 and diffuses around it under the drive of the impeller 5. The phosphorus-containing substances in the slurry then come into contact with and are adsorbed onto the bubbles, thus enriching the phosphorus.

[0025] Understandably, multiple feed inlets 302 can be set and arranged circumferentially to improve the efficiency of introducing phosphorus-containing slurry into the collection channel.

[0026] The foam scraping assembly 2 includes a central rod 201, which extends horizontally in the front-to-back direction and is positioned to the left. Both ends of the central rod 201 are rotatably connected to the chamber 1 via bearings, allowing the central rod 201 to rotate around its own axis. Two support plates 202 are fixedly mounted on the central rod 201, spaced apart along the axial direction of the central rod 201. The support plates 202 are perpendicular to the central rod 201 and symmetrically arranged about the central rod 201. At both ends of the two support plates 202 on the same side of the central rod 201, scraper blades 203 are fixed with fasteners such as bolts and nuts. The scraper blades 203 are strip-shaped and parallel to the central rod 201, with their surfaces perpendicular to the surfaces of the support plates 202. When the central rod 201 rotates, the support plates 202 drive the scraper blades 203 to rotate synchronously, facilitating the scraping of foam formed within the chamber 1.

[0027] To facilitate the provision of driving force for the rotation of the central rod 201, the slag scraping assembly 2 also includes a first drive motor 204. For easy installation of the first drive motor 204, two first support rods 101 are fixedly installed on the top of the chamber 1. The first support rods 101 extend horizontally in the front-rear direction and are spaced apart in the left-right direction. The first support rods 101 are positioned to the right of the central rod 201. A first mounting plate 102 is fixedly installed on the top front side of both first support rods 101. The surface of the first mounting plate 102 is horizontal. The first drive motor 204 is fixed to the top of the first mounting plate 102 during installation using fasteners such as bolts and nuts. The motor shaft of the first drive motor 204 is horizontally positioned to the left. A reducer 205 is fixed to the top of the first mounting plate 102 by fasteners such as bolts and nuts. The reducer 205 is located to the left of the first drive motor 204, with the motor shaft of the first drive motor 204 connected to the input end of the reducer 205. A first pulley 206 is fixedly sleeved at the output end of the reducer 205. A second pulley 207 is fixedly sleeved at the front end of the center rod 201, with the axis of the second pulley 207 parallel to the axis of the first pulley 206. A first transmission belt 208 is connected to both the first pulley 206 and the second pulley 207 for joint transmission. When the center rod 201 rotates, the first drive motor 204 is activated, transmitting power to the first pulley 206 via the reducer 205. The first pulley 206 rotates, simultaneously driving the center rod 201 to rotate via the first transmission belt 208 and the second pulley 207.

[0028] To facilitate the installation of the collecting sleeve 3, multiple ribs 303 are fixedly installed on the outer peripheral wall of the upper sleeve. The multiple ribs 303 are arranged circumferentially. A second mounting plate 304 is fixedly installed at the bottom of all the ribs 303. The surface of the second mounting plate 304 is horizontal and is fixed to the top of the two first support rods 101 by fasteners such as bolts and nuts. The second mounting plate 304 is located behind the first mounting plate 102.

[0029] To facilitate the provision of driving force for the rotation of the central shaft 4, the phosphorus enrichment system further includes a drive assembly 16. The drive assembly 16 includes a second drive motor 1601, which is mounted on the top of the silo 1 and located to the right of the collection sleeve 3, with the motor shaft of the second drive motor 1601 facing upwards. The top end of the central shaft 4 extends upwards to the outside of the collection sleeve 3. A third pulley 1602 is fixedly sleeved on the motor shaft of the second drive motor 1601. A fourth pulley 1604 is fixedly sleeved on the top end of the central shaft 4. A second transmission belt 1603 is connected to both the third pulley 1602 and the fourth pulley 1604 for joint transmission. When the central shaft 4 is driven to rotate, the second drive motor 1601 is activated, driving the third pulley 1602 to rotate. The third pulley 1602, through the second transmission belt 1603 and the fourth pulley 1604, drives the central shaft 4 to rotate.

[0030] During use, the phosphorus-containing slurry is first put into the silo 1; then the second drive motor 1601 is started, the second drive motor 1601 drives the third pulley 1602 to rotate, the third pulley 1602 drives the central shaft 4 to rotate through the second transmission belt 1603 and the fourth pulley 1604, and the central shaft 4 drives the impeller 5 to rotate. When the impeller 5 rotates, it draws negative pressure into the collection channel. Under the action of pressure difference, it drives the outside air to move to the impeller 5 through the air inlet pipe 301 and the collection channel to form bubbles. It also drives the phosphorus-containing slurry to move to the impeller 5 through the feed inlet 302 and the collection channel. Then, under the stirring action of the impeller 5, the phosphorus-containing particles and bubbles come into contact with and are adsorbed on them, and then float to the surface of the phosphorus-containing slurry to form a foam layer. At the same time, the first drive motor 204 is started. The first drive motor 204 transmits power to the first pulley 206 through the reducer 205. The first pulley 206 rotates and drives the center rod 201 to rotate through the first transmission belt 208 and the second pulley 207. The center rod 201 drives the scraper 203 to rotate, thereby scraping the foam out of the silo 1.

[0031] While the above process can achieve phosphorus enrichment, the axial height of impeller 5 is fixed, which determines the relative interaction space between impeller 5 and the bottom of the silo 1 and the slurry surface. When the axial height is fixed, the range of slurry area that impeller 5 can contact and shear is fixed, making it impossible to adjust the shearing intensity and coverage range according to the slurry's concentration, viscosity, and other characteristics. At the same time, the fixed axial height also makes the circulation path and circulation speed of the phosphorus-containing slurry in the silo 1 relatively fixed, making it difficult to adjust the circulation flow range according to the size and density of the phosphorus slurry particles to optimize the contact probability between phosphorus slurry particles and air bubbles.

[0032] When it is necessary to change the shear mixing range (e.g., expanding the shear range to ensure uniform mixing when processing high-viscosity phosphorus-containing slurries, or narrowing the shear range to avoid energy waste when processing low-concentration phosphorus-containing slurries), or to adjust the circulation flow range of phosphorus-containing slurries (e.g., slowing down the circulation speed to prolong adhesion time for fine-particle phosphorus slurries, or speeding up the circulation speed to improve suspension for coarse-particle phosphorus slurries), the axial height of impeller 5 cannot be adjusted. Operators can only achieve the desired result by replacing impeller 5 with one of different axial dimensions. This operation not only requires stopping equipment operation, disassembling the old impeller 5 and installing the new one, interrupting normal production processes and affecting production efficiency; but also requires readjusting the equipment during the replacement process to ensure the precision of the new impeller 5's fit with other components. The operation is cumbersome, increasing labor and time costs. Furthermore, frequent disassembly and installation may cause wear and tear on equipment components, affecting the long-term stable operation of the equipment.

[0033] Meanwhile, once the impeller 5 reaches a stable rotation, the flow field it generates with the phosphorus-containing slurry maintains a relatively fixed shape and motion pattern. This leads to the formation of dead zones, which typically occur in areas where the flow field forces are weak or fluid movement is obstructed, such as the corners at the bottom of the chamber 1, the edges of the impeller 5's effective range, or localized areas opposite to the impeller 5's rotation direction. Because the flow field is relatively fixed, these areas remain weak points in the phosphorus-containing slurry flow, making it difficult for the slurry to circulate and renew effectively, resulting in some slurry remaining in these areas for extended periods. This stagnant slurry cannot fully contact fresh air bubbles, making it difficult for the phosphorus-containing substances to be captured and carried to the surface. This not only wastes the phosphorus-containing raw materials but may also cause particle settling due to prolonged stagnation, adhering to the inner wall or bottom of the chamber 1, increasing the difficulty of equipment cleaning, and even affecting the purity of raw materials in subsequent production. Furthermore, it significantly restricts the collision efficiency and probability between bubbles and phosphorus-containing substances, thus affecting the phosphorus enrichment effect.

[0034] Based on this, in the phosphorus enrichment system provided in this embodiment of the invention, the impeller 5 is configured to have an odd number of blades 501, which are arranged at intervals in the vertical direction. The blade 501 located in the middle is fixedly connected to the central shaft 4. A first elastic element is connected between adjacent blades 501. The first elastic element can be configured as an elastic retaining ring 502. When installed, the elastic retaining ring 502 is sleeved on the central shaft 4 and abuts against the adjacent blades 501. The blades 501 and the central shaft 4 form a spline fit, so that the blades 501 can rotate synchronously with the central shaft 4 and can also slide elastically relative to the central shaft 4 in the vertical direction under the action of the elastic retaining ring 502. The blades 501 have an annular wave structure, and the relatively high points of different layers of blades 501 are correspondingly set to ensure the uniformity of mixing. Multiple first through holes 5011 are opened at the top of each blade 501. The multiple first through holes 5011 are evenly arranged in the circumferential direction to facilitate the passage of phosphorus-containing slurry. When the blade 501 rotates, the relatively high point of the blade 501 can push the phosphorus-containing slurry outward, thereby both agitating the phosphorus-containing slurry and creating negative pressure in the collection channel.

[0035] An upper retaining sleeve 6 is inserted into the bottom of the collecting sleeve 3. The upper retaining sleeve 6 is also sleeved around the outer circumference of the central shaft 4 and is spaced apart from both the collecting sleeve 3 and the central shaft 4. A fixing sleeve 17 is sleeved at the bottom of the collecting sleeve 3. Multiple sets of first insertion holes are opened on the circumferential side wall of the fixing sleeve 17. The multiple sets of first insertion holes are arranged circumferentially, and each set includes multiple first insertion holes. The multiple first insertion holes in the same set are arranged axially at intervals. Multiple sets of second insertion holes 601 are opened on the circumferential side wall of the upper retaining sleeve 6. The multiple sets of second insertion holes 601 are arranged circumferentially. The arrangement includes multiple second insertion holes 601 in each group, with the multiple second insertion holes 601 in the same group arranged at intervals along the axial direction. When the upper retaining sleeve 6 and the fixed sleeve 17 are installed, the same bolt passes through the first insertion hole, the collecting sleeve 3, and the second insertion hole 601 in sequence, and the bolt and the collecting sleeve 3 form a threaded engagement to fix the position of the upper retaining sleeve 6 and the fixed sleeve 17. When the bolt engages with different first insertion holes and second insertion holes 601, the upper retaining sleeve 6 can slide in the vertical direction, and the position after sliding can be locked.

[0036] A lower baffle 7 is provided at the inner bottom of the compartment 1. The lower baffle 7 is sleeved on the outer periphery of the central shaft 4 and spaced apart from the central shaft 4. The top of the lower baffle 7 is open. Multiple sets of third insertion holes 701 are provided on the circumferential side wall of the lower baffle 7. The multiple sets of third insertion holes 701 are arranged circumferentially, and each set includes multiple third insertion holes 701. The multiple third insertion holes 701 in the same set are arranged axially at intervals. When the lower baffle 7 is installed, bolts are passed through the compartment 1 and the third insertion holes 701 in sequence, and the bolts and the third insertion holes 701 form a threaded engagement to fix the position of the lower baffle 7. When the bolts engage with different third insertion holes 701, the lower baffle 7 can slide in the vertical direction, and the position after sliding can be locked.

[0037] At least one upper protrusion 602 is provided at the bottom of the upper sleeve 6. Taking two upper protrusions 602 as an example, the two upper protrusions 602 are arranged circumferentially and are positioned opposite each other. At least one lower protrusion 702 is provided at the inner bottom of the lower sleeve 7. Taking two lower protrusions 702 as an example, the two lower protrusions 702 are arranged circumferentially and are positioned opposite each other, and are positioned corresponding to the upper protrusion 602. A base tube 5012 is coaxially and fixedly provided at the top of the uppermost blade 501 and the bottom of the lowermost blade 501. The base tube 5012 is sleeved on the central shaft 4 and forms a spline fit with the central shaft 4. Two guide rods 5013 are provided on the outer peripheral wall of the base tube 5012. The guide rods 5013 are perpendicular to the base tube 5012. The two guide rods 5013 are arranged circumferentially and are positioned opposite each other.

[0038] The bottom of the upper sleeve 6 and the upper protrusion 602 can both form a stop engagement with the uppermost blade 501 via the guide rod 5013. When the bottom of the upper sleeve 6 and the guide rod 5013 form a stop engagement, the distance between adjacent blades 501 on the upper half is the largest, with the middle blade 501 as the dividing line. When the upper protrusion 602 and the guide rod 5013 form a stop engagement, the distance between adjacent blades 501 on the upper half is the smallest. The inner bottom of the lower sleeve 7 and the lower protrusion 702 can both form a stop engagement with the lowermost blade 501 via the guide rod 5013. When the inner bottom of the lower sleeve 7 and the guide rod 5013 form a stop engagement, the distance between adjacent blades 501 on the lower half is the largest, with the middle blade 501 as the dividing line. When the lower protrusion 702 and the guide rod 5013 form a stop engagement, the distance between adjacent blades 501 on the lower half is the smallest.

[0039] Initially, the vertical positions of the upper baffle sleeve 6 and the lower baffle sleeve 7 are adjusted according to the required shear mixing range and slurry circulation range, thereby adjusting the axial height of the impeller 5 to improve adaptability. Furthermore, when the required shear mixing range and slurry circulation range are larger, the upper baffle sleeve 6 is adjusted to be higher, the lower baffle sleeve 7 to be lower, or vice versa, thus increasing the axial height of the impeller 5 to suit situations with larger required shear mixing and slurry circulation ranges. Similarly, when the required shear mixing range and slurry circulation range are smaller, the upper baffle sleeve 6 is adjusted to be lower, the lower baffle sleeve 7 to be higher, or vice versa, thus decreasing the axial height of the impeller 5 to suit situations with smaller required shear mixing and slurry circulation ranges.

[0040] During the rotation of the central shaft 4, all blades 501 rotate synchronously with the central shaft 4 through spline connection, and the relatively high point of the blades 501 simultaneously pushes the phosphorus-containing slurry outward, thereby both stirring the phosphorus-containing slurry and creating negative pressure in the collection channel. When the bottom of the upper sleeve 6 and the guide rod 5013 form a stop fit, the distance between adjacent blades 501 on the upper half is the largest, with the middle blade 501 as the dividing line. At this time, the bottom of the lower sleeve 7 and the guide rod 5013 form a stop fit, and the distance between adjacent blades 501 on the lower half is the largest. When the upper protrusion 602 and the guide rod 5013 form a stop fit, the distance between adjacent blades 501 on the upper half is the smallest. At this time, the lower protrusion 702 and the guide rod 5013 form a stop fit, and the distance between adjacent blades 501 on the lower half is the smallest. This causes the distance between adjacent blades 501 to increase and decrease periodically, thereby causing the air and phosphorus-containing slurry between adjacent blades 501 to form a radial pulse flow. This can break the stable flow field, causing the air and phosphorus-containing slurry to flow at different speeds, increasing the velocity difference between the phases. This is not only beneficial to the uniformity of the three-phase mixing, but also to improving the collision probability of bubbles and phosphorus-containing particles, thus improving the flotation capacity. Furthermore, during the repeated changes in the blade spacing (501), when the blade spacing (501) increases, the pressure in that region changes instantaneously (e.g., forming a local low-pressure area). This frequent pressure fluctuation is highly conducive to the formation of microbubbles (cavitation effect).

[0041] In a further embodiment, to improve the flotation effect, multiple first guide plates 8 can be fixedly installed at the bottom of the chamber 1. The multiple first guide plates 8 are arranged at equal intervals along the circumference of the central axis 4 and are located on the outer periphery of the impeller 5. The first guide plates 8 are vertically arranged and extend radially along the central axis 4. In this way, when the mixture is thrown out by the impeller 5, the first guide plates 8 divide the mixture into multiple independent parts along the circumference, which increases the shear strength and ensures the stability of the subsequent bubble rise.

[0042] In a further embodiment, to further improve the flotation effect, multiple second guide plates 9 are provided at the bottom of the tank 1. The second guide plates 9 are vertically arranged and are equally spaced along the circumference of the central axis 4, alternating with the first guide plates 8. A first support ring 901 is fixedly provided at the bottom of the multiple second guide plates 9. The first support ring 901 is coaxial with the central axis 4. The first support ring 901 can rotate around the axis of the central axis 4 to drive the multiple second guide plates 9 to rotate synchronously around the axis of the central axis 4. The second guide plates 9 have corresponding first... In the first position, the second guide plate 9 and the first guide plate 8 are closely attached. In the second position, the second guide plate 9 and the first guide plate 8 are spaced apart and extend radially along the central axis 4. When the distance between adjacent blades 501 decreases, the mixture between adjacent blades 501 moves outward. At this time, the second guide plate 9 switches from the first position to the second position, so that the mixture can be divided into more independent parts in the circumferential direction by the first guide plate 8 and the second guide plate 9. This further increases the shear strength and further ensures the stability of the subsequent bubble rise.

[0043] In a further embodiment, to improve the flotation effect, an upper end cover 10 may be fitted around the outer periphery of the upper sleeve 6, and the upper end cover 10 may also be fitted onto the fixed sleeve 17. A lower end cap 11 is fitted onto the lower baffle 7. The lower end cap 11 is annular and fixed to the bottom of the chamber 1, and is coaxial with the central shaft 4. A fixing tube 1101 is coaxially and fixedly installed on the top of the lower end cap 11. Multiple sets of fourth insertion holes 1701 are opened on the circumferential side wall of the fixing tube 1101. The multiple sets of fourth insertion holes 1701 are arranged circumferentially, and each set includes multiple fourth insertion holes 1701. The multiple fourth insertion holes 1701 in the same set are arranged axially at intervals. When the lower baffle 7 is installed, the same bolt passes through the fourth insertion hole 1701 and the third insertion hole 701 in sequence, and the bolt and the fourth insertion hole 1701 and / or the third insertion hole 701 form a threaded engagement to fix the position of the lower baffle 7. When the bolt engages with different third insertion holes 701 and fourth insertion holes 1701, the lower baffle 7 can slide in the vertical direction, and the position after sliding can be locked. Multiple second support rods 1102 are vertically and fixedly installed at the top of the lower baffle 7, and the multiple second support rods 1102 are evenly arranged along the axis of the lower baffle 7; a second support ring 1103 is provided at the top of the multiple second support rods 1102, the second support ring 1103 is coaxially arranged with the lower baffle 7, and is fixedly connected to the upper end cover 10 by fasteners such as bolts and nuts during installation, so as to facilitate the fixation of the upper end cover 10.

[0044] The lower end cover 11 and the upper end cover 10 are spaced apart, and a plurality of support rods 12 are vertically connected between the lower end cover 11 and the upper end cover 10. The plurality of support rods 12 are arranged at equal intervals along the circumference of the central axis 4. A plurality of third guide plates 13 are sleeved on each support rod 12. The plurality of third guide plates 13 on the same support rod 12 are arranged at intervals along the extension direction of the support rod 12. The third guide plates 13 are configured to guide the flow in the radial direction along the central axis 4. In this way, by utilizing the guiding characteristics of the third guide plates 13, both shear strength and radial movement of the mixture can be effectively increased, the collision probability of bubbles and phosphorus-containing particles can be increased, thereby improving the flotation capacity.

[0045] It should be noted that, in order to improve the efficiency of introducing phosphorus-containing slurry into the impeller 5, the lower end cover 11 and the bottom of the bin 1 are spaced apart to form a cavity between them. The cavity is connected to the space between the impeller 5 and the bin 1. Multiple second through holes 1104 are opened on the top of the lower end cover 11. The multiple second through holes 1104 are evenly arranged in the circumferential direction and are connected to the cavity, so that the phosphorus-containing slurry between the impeller 5 and the bin 1 can be introduced into the impeller 5 through the cavity and the second through holes 1104 in sequence.

[0046] In a further embodiment, to enhance the turbulence effect, multiple third guide plates 13 are arranged alternately from bottom to top on the same support rod 12. Thus, by utilizing the characteristic that different third guide plates 13 on the same support rod 12 have different guiding directions, the turbulence effect is improved, increasing the probability of collision between bubbles and phosphorus-containing particles.

[0047] In a further embodiment, to further improve the turbulence effect, the third guide plate 13 is configured to rotate around the support rod 12; a third support ring 1201 is fixedly provided at the bottom of all the support rods 12, the third support ring 1201 and the lower end cover 11 are coaxially arranged and located below the lower end cover 11, the third support ring 1201 can slide in the vertical direction to synchronously drive all the support rods 12 to slide in the vertical direction; an insertion tube 1301 is fixedly provided at the top center of each third guide plate 13, the insertion tube 1301 is sleeved on the support rod 12 during installation. During installation, the insertion tube 1301 on the lower third guide plate 13 is inserted into the bottom of the upper third guide plate 13. The lowermost third guide plate 13 on each support rod 12 forms a helical engagement with the support rod 12. Other third guide plates 13 are connected to the lower third guide plate 13 via a second elastic element. This second elastic element can be a coil spring 14, which is sleeved on the insertion tube 1301, with its inner end fixedly connected to the insertion tube 1301 and its outer end fixedly connected to the upper third guide plate 13 among the adjacent third guide plates 13. When the support rod 12 slides vertically, the helical engagement causes the lowermost third guide plate 13 on each support rod 12 to rotate, simultaneously causing the penultimate coil spring 14 to deform and store energy. The coil spring 14 then releases, simultaneously causing the penultimate third guide plate 13 to rotate, and so on, so that the third guide plates 13 on the same support rod 12 rotate sequentially from bottom to top. Furthermore, when the distance between adjacent blades 501 decreases, the third guide plate 13 begins to rotate, further enhancing the turbulence effect.

[0048] In a further embodiment, to simultaneously achieve the sliding of the support rod 12 and the position switching of the second guide plate 9, the chamber 1 is configured to be divided into two independent chambers in the vertical direction; the phosphorus enrichment system also includes a drive cylinder 15, which is installed in the lower independent chamber, with the output shaft of the drive cylinder 15 facing upward and a mounting plate 1501 fixedly installed at its end, the mounting plate 1501 being horizontally positioned; a first support ring 901 is inserted into the lower independent chamber and sleeved on the mounting plate 1501, with multiple spiral grooves 9011 provided on the inner circumferential wall of the first support ring 901, the multiple spiral grooves 9011 being arranged circumferentially; multiple spiral protrusions 15011 are provided on the circumferential sidewall of the mounting plate 1501, the spiral protrusions 15011 being corresponding to and slidably inserted into the spiral grooves 9011, and the first support ring 901 and the mounting plate 1501 forming a spiral engagement. Multiple guide posts 12011 are vertically and fixedly installed at the bottom of the third support ring 1201. The multiple guide posts 12011 are arranged circumferentially and inserted downward into the independent chamber located below. Multiple guide sleeves 15012 are vertically and fixedly installed at the top of the mounting plate 1501. The multiple guide sleeves 15012 are arranged circumferentially and are correspondingly and fixedly sleeved on the guide posts 12011, so that the third support ring 1201 can slide synchronously with the mounting plate 1501 in the vertical direction.

[0049] During use, when the drive cylinder 15 is activated and its output shaft extends, it synchronously drives the mounting plate 1501 to move upward. The mounting plate 1501, through the helical engagement between the helical protrusion 15011 and the helical groove 9011, drives the first support ring 901 to rotate. The first support ring 901 drives the second guide plate 9 to move from the first position to the second position. On the other hand, through the third support ring 1201, it drives all the support rods 12 to move upward, and through the helical engagement, drives the third guide plate 13 located at the bottom of each support rod 12 to rotate. This synchronously drives the second-to-last coil spring 14 to deform and store force. Then, the coil spring 14 releases and synchronously drives the second-to-last layer of third guide plates 13 to rotate. This process continues, causing the third guide plates 13 on the same support rod 12 to rotate sequentially from bottom to top.

[0050] When the output shaft of the drive cylinder 15 retracts, it synchronously drives the mounting plate 1501 to move downward. On the one hand, the mounting plate 1501 drives the first support ring 901 to rotate through the helical engagement between the helical protrusion 15011 and the helical groove 9011. The first support ring 901 drives the second guide plate 9 to move from the second position to the first position. On the other hand, it drives all the support rods 12 to move downward through the third support ring 1201, and through the helical engagement, drives the third guide plate 13 located at the bottom of each support rod 12 to rotate to the reset position. The coil spring 14 is released, and synchronously drives all the third guide plates 13 except the third guide plate 13 located at the bottom to rotate to the reset position.

[0051] Understandably, the drive cylinder 15 can be configured as any one of a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder.

[0052] Another embodiment of the present invention also provides a phosphorus enrichment process, which employs any of the above-described phosphorus enrichment systems and includes the following steps: S1. Adjust the positions of the upper sleeve 6 and the lower sleeve 7 according to the required shear mixing range and slurry circulation flow range. The larger the required shear mixing range and slurry circulation flow range, the larger the distance between the upper sleeve 6 and the lower sleeve 7. Specifically, when the required shear mixing range and slurry circulation range are larger, the upper baffle sleeve 6 is adjusted to be higher / the lower baffle sleeve 7 is adjusted to be lower / the upper baffle sleeve 6 is adjusted to be higher and the lower baffle sleeve 7 is adjusted to be lower, thereby adjusting the axial height of the impeller 5 to be larger, adapting to the situation where the required shear mixing range and slurry circulation range are larger; similarly, when the required shear mixing range and slurry circulation range are smaller, the upper baffle sleeve 6 is adjusted to be lower / the lower baffle sleeve 7 is adjusted to be higher / the upper baffle sleeve 6 is adjusted to be lower and the lower baffle sleeve 7 is adjusted to be higher, thereby adjusting the axial height of the impeller 5 to be smaller, adapting to the situation where the required shear mixing range and slurry circulation range are smaller.

[0053] S2. Add the phosphorus-containing slurry into the silo 1; S3 drives the central shaft 4 to rotate, and the central shaft 4 synchronously drives the impeller 5 to rotate, creating a negative pressure in the collection channel. Under the action of pressure difference, the outside air and the phosphorus-containing slurry in the bin 1 enter the collection channel and then flow to the impeller 5. At the same time, under the stop of the upper baffle sleeve 6, the upper protrusion 602, the lower baffle sleeve 7 and the lower protrusion 702, the distance between adjacent blades 501 increases and decreases periodically, so that the air and phosphorus-containing slurry between adjacent blades 501 form a radial pulse flow, which then forms bubbles. The bubbles float up and accumulate phosphorus-containing substances, and finally rise to the surface of the phosphorus-containing slurry and form a foam layer. Specifically, when the bottom of the upper sleeve 6 and the guide rod 5013 form a stop fit, the distance between adjacent blades 501 on the upper half is the largest, with the middle blade 501 as the dividing line. At this time, the bottom of the lower sleeve 7 and the guide rod 5013 form a stop fit, and the distance between adjacent blades 501 on the lower half is the largest. When the upper protrusion 602 and the guide rod 5013 form a stop fit, the distance between adjacent blades 501 on the upper half is the smallest. At this time, the lower protrusion 702 and the guide rod 5013 form a stop fit, and the distance between adjacent blades 501 on the lower half is the smallest. This causes the distance between adjacent blades 501 to increase and decrease periodically, thereby causing the air and phosphorus-containing slurry between adjacent blades 501 to form a radial pulse flow.

[0054] S4. The foam is scraped out of the chamber 1 by the foam scraper assembly 2.

[0055] Specifically, the foam is scraped out of the chamber 1 by the rotation of the scraper 203.

[0056] The technical features of the above embodiments can be combined in any way.

Claims

1. A phosphorus enrichment system, characterized by, The phosphorus enrichment system comprises: a bin body configured to receive a phosphorus-containing slurry; a foam scraping assembly configured to scrape foam formed in the bin body; a collecting sleeve vertically inserted into the bin body; a central shaft vertically inserted into the collecting sleeve and rotatable about its own axis; a impeller sleeved on the central shaft and rotatable synchronously with the central shaft; a collecting channel formed between the central shaft and the collecting sleeve, the collecting channel being in communication with the bin body and the impeller and configured to receive air from outside and the phosphorus-containing slurry from the bin body and guide the air and the phosphorus-containing slurry to the impeller; the impeller having an odd number of blades arranged in a vertical direction, the middle blade being fixedly connected to the central shaft, and first elastic members being connected between adjacent blades, the blades other than the middle blade being elastically slidable in the vertical direction under the action of the first elastic members, the blades being annular wave structures; 2. The phosphorus enrichment system according to claim 1, characterized by, an upper stop sleeve provided at the bottom of the collecting sleeve and sleeved on the outer periphery of the central shaft, the bottom of the upper stop sleeve being provided with at least one upper protrusion, the bottom of the upper stop sleeve and the upper protrusion being capable of forming a stop cooperation with the uppermost blade, the upper stop sleeve being slidable in the vertical direction and the position after sliding being lockable; 3. The phosphorus enrichment system according to claim 2, characterized in that, a lower stop sleeve provided at the bottom of the bin body and sleeved on the outer periphery of the central shaft, the inner bottom of the lower stop sleeve being provided with at least one lower protrusion corresponding to the upper protrusion, the inner bottom of the lower stop sleeve and the lower protrusion being capable of forming a stop cooperation with the lowermost blade, the lower stop sleeve being slidable in the vertical direction and the position after sliding being lockable.

4. The phosphorus enrichment system according to claim 3, characterized in that, The bottom of the bin body is provided with a plurality of first flow guides arranged in a circumferential direction of the central shaft; 5. The phosphorus enrichment system according to claim 4, characterized in that, the first flow guides being vertically arranged and extending in a radial direction of the central shaft. The bottom of the bin body is provided with a plurality of second flow guides vertically arranged, the second flow guides being arranged in the circumferential direction of the central shaft and alternately arranged with the first flow guides, the plurality of second flow guides being rotatable synchronously about the axis of the central shaft and having corresponding first and second positions before and after rotation, the second flow guides being closely arranged with the first flow guides when in the first position and being arranged in a spaced manner with the first flow guides and extending in the radial direction of the central shaft when in the second position; the second flow guides being switched from the first position to the second position when the distance between adjacent blades decreases. An upper end cover is sleeved on the upper stop sleeve in a sliding manner; a lower end cover is sleeved on the lower stop sleeve in a sliding manner, the lower end cover and the upper end cover being arranged in a spaced manner and being vertically connected by a plurality of support rods arranged in the circumferential direction of the central shaft, a plurality of third flow guides being sleeved on each support rod, the third flow guides on the same support rod being arranged in a spaced manner in the extension direction of the support rod, the third flow guides being configured to guide flow in the radial direction of the central shaft. The third flow guides on the same support rod are arranged in a staggered manner from bottom to top.

6. The phosphorus enrichment system according to claim 5, characterized in that, The third guide plates are capable of rotating around the support rods; all the support rods are capable of sliding in the vertical direction synchronously; the third guide plate located at the lowermost position on each support rod is in screwing cooperation with the support rod, and the other third guide plates are connected with the lower third guide plate through the second elastic members, and under the action of the second elastic members, when the lower third guide plate rotates, the upper third guide plate is capable of rotating following the lower third guide plate; when the distance between the adjacent blades decreases, the third guide plate starts to rotate.

7. The phosphorus enrichment system according to claim 6, characterized in that, The phosphorus enrichment system further comprises a driving cylinder, an output shaft of the driving cylinder is upwardly arranged, and an installation disc is fixedly arranged at an end portion of the output shaft; all the second guide plates are commonly arranged on the first supporting ring, the first supporting ring is sleeved on the installation disc and is capable of rotating around an axis thereof, a spiral groove is arranged on an inner circumferential wall of the first supporting ring, and a spiral protrusion is arranged on a circumferential side wall of the installation disc, the spiral protrusion is slidingly inserted into the spiral groove, and the first supporting ring and the installation disc are in screwing cooperation.

8. The phosphorus enrichment system according to claim 6, characterized by, The second elastic member is a coil spring.

9. The phosphorus enrichment system of claim 1, wherein, The first elastic member is an elastic washer, the elastic washer is sleeved on the central shaft and abuts between the adjacent two blades.

10. A process for the enrichment of phosphorus, characterized in that, The phosphorus enrichment system of claim 1 is adopted, and a phosphorus enrichment process comprises the following steps: S1, adjusting the positions of the upper sleeve and the lower sleeve according to the required shear mixing range and slurry circulating flow range, and the greater the required shear mixing range and slurry circulating flow range, the greater the distance between the upper sleeve and the lower sleeve; S2, putting the phosphorus-containing slurry into the bin body; S3, driving the central shaft to rotate, the central shaft synchronously drives the impeller to rotate, so that a negative pressure is formed in the material collecting channel, under the action of the pressure difference, the air outside and the phosphorus-containing slurry in the bin body enter the material collecting channel, and then flow to the impeller; at the same time, under the stopping of the upper sleeve, the upper protrusion, the lower sleeve and the lower protrusion, the distance between the adjacent blades periodically increases and decreases, so that the air and the phosphorus-containing slurry between the adjacent blades form radial pulse flow, then the air forms bubbles, the bubbles float on the surface of the phosphorus-containing slurry and enrich the phosphorus-containing substances, and finally rise to the surface of the phosphorus-containing slurry and form a foam layer; S4, scraping the foam out of the bin body through the foam scraping assembly.

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