A sodium hexafluorophosphate production unit

Abstract

This invention relates to the field of sodium hexafluorophosphate production, and particularly to a sodium hexafluorophosphate production apparatus, comprising a base plate and tanks. Several support columns are arranged at the upper end of the base plate, and three tanks are arranged at equal intervals above the support columns. Adjacent tanks are connected by several arc-shaped support plates. A stirring unit for preliminary mixing of chemical agents is installed in the lower tank. This invention uses a storage unit to store and preliminarily stir hydrogen fluoride and tetrapolyphosphoric acid raw materials. The mixed raw materials are then pumped to the lower tank via a water pump, where the stirring unit further stirs the raw materials. The preliminarily mixed raw materials are then transferred to the middle tank via a transfer assembly and the stirring unit. A water temperature unit regulates the temperature inside the corresponding tank, ensuring thorough mixing of the raw materials.

Description

Technical Field

[0001] This invention relates to the field of sodium hexafluorophosphate production, and particularly to a sodium hexafluorophosphate production apparatus. Background Technology

[0002] Sodium hexafluorophosphate is an inorganic compound widely used in electrolytes for lithium-ion batteries due to its excellent ionic conductivity, which helps improve battery performance. It is also used as a catalyst in certain chemical reactions and as a reagent in analytical chemistry and electroplating processes. Despite its significant value in these applications, sodium hexafluorophosphate's fluorine-containing nature means that caution must be exercised in its handling and use, as fluorides can pose risks to the environment and human health, including potential toxic effects.

[0003] Sodium hexafluorophosphate requires the addition of hydrogen fluoride (HF) and tetrapolyphosphoric acid (H6P4O) during its production. 13 The mixture is stirred in a container and reacted at a specific temperature. The resulting HPF6, H2SO4, and HF mixture is then added to another reaction container and reacted at a specific temperature. During this process, a mixture of HPF6, PF5, and HF gas is generated. The HPF6, PF5, and HF gas is then condensed into a liquid using a condenser. The HPF6, PF5, and HF mixture and the NaF and HF solution are then discharged into the reaction container for further reaction, thus yielding a mixture of HPF6, NaPF6, and HF.

[0004] The above HPF6, NaPF6, and HF materials are then transferred through a condenser to a crystallizer, a scrubber, and a dryer to obtain the finished product, sodium hexafluorophosphate (NaPF6).

[0005] The above process requires the use of a large number of reaction vessels, which occupy a lot of space. In order to maintain the temperature inside the reaction vessels, a lot of energy is also required. In addition, the existing production equipment usually cannot effectively recycle raw materials, and some non-gas-liquid raw materials generated during the production process still need to be discharged manually by disassembling the existing equipment, which not only causes waste, but also makes the process cumbersome.

[0006] For example, Chinese patent publication number CN221191575U discloses an apparatus for producing sodium hexafluorophosphate in a one-pot process.

[0007] It includes a reactor, a crystallizer, a spray tower, and a solvent storage tank; the reactor tail gas outlet is connected to the spray tower after passing through a hydrogen fluoride condenser, and the reactant outlet is connected to the crystallizer after passing through a reaction liquid separator; the bottom outlet of the spray tower is connected to a by-product separator, and its solid phase outlet is connected to a by-product packaging machine after passing through a by-product dryer, while its liquid phase outlet is connected to both the spray tower and the absorbent storage tank; the upper gas phase outlet of the crystallizer is connected to the reactor after passing through a solvent condenser and a solvent storage tank in sequence, and the bottom material outlet is connected to the main product packaging machine after passing through a main product separator and a main product dryer.

[0008] However, the aforementioned sodium hexafluorophosphate production equipment still has some shortcomings in actual use:

[0009] 1. Although the above-mentioned production device can collect some of the by-products during the production of sodium hexafluorophosphate by connecting to a by-product collector, the residual compounds on the inner wall of the device after production cannot be wiped off quickly and effectively, thus its applicability is low.

[0010] 2. Although the above-mentioned device can quickly produce sodium hexafluorophosphate through a complete process, it still requires a large number of auxiliary equipment for auxiliary production, that is, more auxiliary production energy. Therefore, it cannot effectively reduce its production cost. Moreover, after the above-mentioned production device completes the production of sodium hexafluorophosphate, it cannot quickly fill the finished sodium hexafluorophosphate into storage tanks, which further reduces its applicability.

[0011] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing sodium hexafluorophosphate production facilities. Summary of the Invention

[0012] To address the aforementioned problems, this invention provides a sodium hexafluorophosphate production apparatus, comprising a base plate and tanks. Several support columns are provided at the upper end of the base plate, and three tanks are provided at equal intervals at the upper end of the support columns. Adjacent tanks are connected by several arc-shaped support plates. A stirring unit for preliminary mixing and stirring of the chemical agents is provided in the lower tank.

[0013] The stirring unit includes a main shaft that is rotatably mounted inside the lower tank. Spiral blades are mounted on the outside of the main shaft, and the outer side of the spiral blades is in contact with the inner wall of the tank.

[0014] Preferably, the stirring unit further includes an annular cone disposed on the inner wall of the lower end of the tank, and a conical column with an outer side corresponding to the inner wall of the annular cone disposed on the upper end of the main shaft, and a spiral blade attached to the inner wall of the annular cone disposed on the outer side of the conical column.

[0015] The lower tank and the middle tank are connected by a connecting cylinder.

[0016] Preferably, the connecting cylinder is provided with a transfer component for transferring the chemical agent in the lower tank to the middle tank. The transfer component includes an auger rod disposed at the upper end of the conical column and located in the connecting cylinder. The upper end of the connecting cylinder is located inside the middle tank, and the upper end of the auger rod is higher than the upper end of the connecting cylinder.

[0017] Preferably, one side of each of the three tanks is provided with a water temperature unit for regulating the internal temperature so that the chemical agent can react fully. The water temperature unit includes an annular groove inside the tank and a connecting pipe with one end communicating with the annular groove inside the tank on the outside of each tank. The ends of the connecting pipes outside the tanks are connected together by a series pipe.

[0018] Preferably, the middle connecting tube is provided with a partition plate at both ends that are respectively attached to the inner wall of the corresponding annular groove and the series tube. Two rectangular boxes are provided on the outside of the series tube, located on both sides of the middle connecting tube. The rectangular boxes are provided with circular grooves. Several semiconductor plates are provided on the inner wall of the circular grooves, evenly distributed along their extensions, and the middle of the semiconductor plates is attached to the outer side of the series tube.

[0019] The lower tank has a water injection pipe with one end inserted inside it on its outer side, and the upper tank has a water outlet with one end inserted inside it on one side.

[0020] Preferably, the outer side of the connecting cylinder is also provided with a stirring component for stirring the chemical mixture so that the mixture can react fully. The stirring component includes an annular ring that is rotatably sleeved on the outer side of the connecting cylinder. Several arc-shaped blades are provided on the outer side of the annular ring and evenly distributed along its axis. The connecting pipe between the middle tank and the upper tank is connected through. The main shaft, the conical column and the auger rod are all provided with through grooves in the middle. A drive shaft is slidably arranged in the through groove. One end of the drive shaft is located inside the middle tank. A U-shaped ring is provided on the upper end of the drive shaft to seal one end of the connecting pipe.

[0021] Preferably, the lower end of the U-shaped ring is provided with an arc-shaped plate, and the upper end of the annular ring is provided with an arc-shaped groove corresponding to the arc-shaped plate.

[0022] An arc plate is provided on one side of the middle tank body. An opening and closing groove is provided on the arc plate, and a storage groove is provided on the inner wall of the opening and closing groove, which extends into the interior of the arc plate. A sealing plate for sealing the opening and closing groove is slidably installed in the storage groove, and a lever is provided on one side of the sealing plate.

[0023] Preferably, the main shaft passes through the lower end of the tank and is provided with a drive ring. The drive ring is provided with a drive unit for driving the main shaft and the drive shaft to rotate. The drive unit includes a push cylinder provided on the bottom plate. The extension end of the push cylinder is provided with a drive motor through the cylinder seat, and the output end of the drive motor is connected to the lower end of the drive shaft. An internal gear ring is provided on the inner wall of the drive ring, and a drive gear meshing with the internal gear ring is sleeved on the output shaft of the drive motor.

[0024] Preferably, a condensing assembly for condensing the gas generated during the chemical reaction is provided on one side of both the upper and lower tanks. The condensing assembly includes a bent pipe I provided on one side of the lower tank and extending into its interior, and a bent pipe II provided on one side of the upper tank with one end extending into its interior. A condenser is connected between the bent pipe I and the bent pipe II.

[0025] Preferably, a discharge pipe is provided on one side of the condenser, and the discharge pipe is connected to the second bent pipe through the condenser. A third bent pipe is also provided on one side of the condenser, and the third bent pipe is connected to the first bent pipe through the condenser.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] I. This invention uses a storage unit to store and initially stir hydrogen fluoride and tetrapolyphosphoric acid raw materials. Then, a water pump transports the mixed raw materials to the lower tank, where a stirring unit further stirs the raw materials. The initially mixed raw materials are then transferred to the middle tank via a combination of a transport component and the stirring unit. A water temperature unit regulates the temperature inside the corresponding tank, ensuring thorough mixing of the raw materials.

[0028] Second, the present invention can re-stir the raw materials in the middle tank through the stirring component, and the stirring component can also discharge the reactants that have been reacted in the middle tank to the outside of the tank after the production of sodium hexafluorophosphate is completed in this device, which saves the tedious steps of manual cleaning and increases the applicability of the present invention.

[0029] Third, through the transmission and cooperation of the drive unit and the linkage component, the present invention can drive the stirring component, the stirring unit and the storage unit with only two drives, so that they can be tightly coordinated, saving unnecessary drive costs and reducing the difficulty of subsequent maintenance, thus further increasing the applicability of the present invention. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present invention.

[0033] Figure 3 This is a schematic diagram of the structure of the stirring unit, the transmission component, and the water temperature unit of the present invention.

[0034] Figure 4 This is a partial structural schematic diagram of the stirring component of the present invention.

[0035] Figure 5 This is a schematic diagram of the structure of the driving unit of the present invention.

[0036] Figure 6 This is a schematic diagram of the condensation component of the present invention.

[0037] Figure 7 This is a schematic diagram of the storage unit of the present invention.

[0038] Figure 8 This is a schematic diagram of the linkage component of the present invention.

[0039] In the diagram, 1. Base plate; 10. Support column; 11. Tank body; 12. Arc-shaped support plate; 2. Stirring unit; 20. Main shaft; 21. Spiral blade; 22. Annular cone; 23. Conical column; 24. Connecting cylinder; 3. Transmission assembly; 30. Screw rod; 4. Water temperature unit; 40. Annular groove; 41. Connecting pipe; 42. Series pipe; 43. Divider plate; 44. Rectangular box; 45. Semiconductor board; 46. Water injection pipe; 47. Water outlet; 5. Stirring component; 50. Annular ring; 51. Arc-shaped blade; 52. Connecting pipe; 53. Drive shaft; 54. U-shaped ring; 55. Arc-shaped plate; 56. Arc-shaped groove; 57. Arc plate; 58. Opening / closing slot; 59. Storage slot; 510. Sealing plate; 511. Pulley; 6. Drive unit; 60. Drive ring; 61. Push cylinder; 62. Drive motor; 63. Internal gear ring; 64. Drive gear; 7. Condensation assembly; 70. Bend pipe one; 71. Bend pipe two; 72. Condenser; 73. Discharge pipe; 74. Bend pipe three; 8. Storage unit; 80. Storage tank; 81. Feed pipe; 82. Conveying pipe; 83. Water pump; 84. Rotating shaft; 85. Swing rod; 86. Stirring plate; 9. Linkage assembly; 90. Linkage gear; 91. Support plate; 92. Drive shaft; 93. Drive gear. Detailed Implementation

[0040] The following combination Figures 1 to 8 The embodiments of the present invention will be described in detail, but the present invention may be implemented in many different ways as defined and covered by the claims.

[0041] This application discloses a sodium hexafluorophosphate production apparatus. The apparatus is primarily used in the production of sodium hexafluorophosphate. Technically, it utilizes a multi-stage reaction vessel system to produce sodium hexafluorophosphate according to the production sequence of the raw materials. Specifically, after the raw materials have completed their reaction, excess reaction gas can be returned to the feeding device for reuse. Furthermore, this apparatus can also uniformly remove byproducts generated during production, further enhancing the applicability of the invention.

[0042] Example 1: Refer to Figure 1 and Figure 2 As shown, the system includes a base plate 1, support columns 10, tanks 11, arc-shaped support plates 12, and a stirring unit 2. Several support columns 10 are provided on the upper end of the base plate 1. Three tanks 11 are evenly spaced on the upper end of the support columns 10, and adjacent tanks 11 are connected by several arc-shaped support plates 12. The support columns 10 support the bottom tanks 11, and the middle and upper tanks 11 are mutually supported and connected by the arc-shaped support plates 12. The lower tank 11 is equipped with a stirring unit 2 for preliminary mixing and stirring of chemical agents. After hydrogen fluoride and tetrapolyphosphoric acid are added to the lower tank 11, the stirring assembly drives them to react fully.

[0043] Continue to refer to Figure 2 and Figure 3 As shown, this is the stirring unit 2 for preliminary mixing and stirring of chemical agents. Specifically, the stirring unit 2 includes a main shaft 20, a spiral blade 21, an annular cone 22, a conical column 23, and a connecting cylinder 24. The main shaft 20 is rotatably mounted on the inner wall of the lower tank 11, and the spiral blade 21 is provided on the outer side of the main shaft 20, with the outer side of the spiral blade 21 in contact with the inner wall of the tank 11. When hydrogen fluoride and tetrapolyphosphoric acid (hereinafter referred to as the mixture) enter the lower tank 11, the spiral blade 21 rotates under the drive of the main shaft 20, and the spiral blade 21 drives the mixture to move downwards in the tank 11. During this process, the mixture is compressed and fully mixed.

[0044] An annular cone 22 is provided on the inner wall of the lower tank 11. A conical column 23 corresponding to the inner wall of the annular cone 22 is provided on the upper end of the main shaft 20. A spiral blade 21 with its outer side attached to the inner wall of the annular cone 22 is also provided on the outer side of the conical column 23. A connecting cylinder 24 is provided between the lower tank 11 and the middle tank 11. When the mixture is fully mixed, the main shaft 20 drives the spiral blade 21 to rotate in the opposite direction, so that the spiral blade 21 can move the mixture towards the upper end of the tank 11. The main shaft 20 can drive the conical column 23 to rotate synchronously. At this time, the spiral blade 21 on the outer side of the conical column 23 and the annular cone 22 cooperate with each other to finally transfer the mixture into the connecting cylinder 24.

[0045] Continue to refer to Figure 3 As shown, the connecting cylinder 24 is equipped with a transfer assembly 3 for transferring the chemical agent in the lower tank 11 to the middle tank 11. Specifically, the transfer assembly 3 includes an auger rod 30, which is located at the upper end of the conical column 23 and inside the connecting cylinder 24. The upper end of the connecting cylinder 24 is located inside the middle tank 11, and the upper end of the auger rod 30 is higher than the upper end of the connecting cylinder 24. When the conical column 23 is rotated by the main shaft 20, it can synchronously drive the auger rod 30 to rotate inside the connecting cylinder 24. When the auger rod 30 rotates, it synchronously drives the mixture through the connecting cylinder 24 into the middle tank 11.

[0046] Continue to refer to Figure 3 As shown, each of the three tanks 11 has a water temperature unit 4 on one side for regulating the internal temperature so that the chemical agent can react fully at a suitable temperature. Specifically, the water temperature unit 4 includes an annular groove 40, a connecting pipe 41, a series pipe 42, a partition plate 43, a rectangular box 44, a semiconductor plate 45, a water injection pipe 46, and a water outlet 47. The annular groove 40 is located inside the tank 11. Each tank 11 has a connecting pipe 41 on its outer side that is connected to the annular groove 40 inside it. The ends of the connecting pipes 41 located outside the tank 11 are connected to each other through the series pipe 42. Water can be injected into the annular groove 40 of the corresponding tank 11 through the connecting pipe 41, and water in the series pipe 42 can enter the annular groove 40 through the connecting pipe 41.

[0047] Inside the central connecting pipe 41, there is a partition plate 43 with its two ends respectively attached to the inner walls of the corresponding annular groove 40 and the series pipe 42. Two rectangular boxes 44 are respectively located on both sides of the central connecting pipe 41 on the outside of the series pipe 42. The rectangular boxes 44 have circular grooves inside, and several semiconductor plates 45 are evenly distributed along their extensions on the inner walls of the circular grooves. The middle part of the semiconductor plates 45 is attached to the outer side of the series pipe 42.

[0048] The semiconductor plate 45 can generate heat and cool. Through the semiconductor plate 45, the water temperature in the series pipe 42 can be controlled to be high or low. When the water is injected into the corresponding annular groove 40 by the connecting pipe 41 in the middle, the temperature in the tank 11 can be controlled by the water, so that the mixture in the middle tank 11 can react at a specific temperature. The partition plate 43 is used to separate the corresponding annular groove 40 in the middle and the series pipe 42, so that the water can first enter the annular groove 40 in the middle, circulate once, and then enter the series pipe 42 again through the upper part separated by the partition plate 43 through the corresponding connecting pipe 41. The partition plate 43 can also divide the water in the series pipe 42 into two parts, so that the water temperature heated by the semiconductor plate 45 in the upper and lower rectangular boxes 44 does not interfere with each other, and the temperature inside the middle and upper tanks 11 is not the same.

[0049] It should be noted that the connecting pipe 41 of the lower tank 11 is only used to drain the water in the corresponding annular groove 40 into the series pipe 42, and the connecting pipe 41 of the upper layer is only used to drain the water in the series pipe 42 into the annular groove 40.

[0050] The lower tank 11 has a water injection pipe 46 with one end inserted inside it on its outer side, and the upper tank 11 also has a water outlet 47 with one end inserted inside it on one side. The water injection pipe 46 can be connected to an external water injection device, so that the external water injection device can inject water into the annular groove 40 of the lower tank 11. After the water in the annular groove 40 of the upper tank 11 circulates once, it can be discharged out of the annular groove 40 through the water outlet 47, so that the water flow can circulate and maintain the stability of the temperature.

[0051] Continue to refer to Figure 2 , Figure 3 and Figure 4 As shown, a stirring element 5 for stirring the chemical mixture is also provided on the outside of the connecting cylinder 24 so that the mixture can react fully; specifically, the stirring element 5 includes an annular ring 50, arc-shaped blades 51, a connecting pipe 52, a drive shaft 53, a U-shaped ring 54, an arc-shaped plate 55, an arc-shaped groove 56, an arc plate 57, an opening and closing groove 58, a receiving groove 59, a sealing plate 510, and a deflector plate 511. The annular ring 50 is rotatably sleeved on the outside of the connecting cylinder 24. Several arc-shaped blades 51 are evenly distributed along its axis on the outside of the annular ring 50. The annular ring 50 can drive the arc-shaped blades 51 to rotate under the limitation of the connecting cylinder 24. After the mixture is brought into the tank 11 in the middle by the auger rod 30, it will fall onto the inner wall of the tank 11 and come into contact with the arc-shaped blades 51. The arc-shaped blades 51 can stir the mixture when they rotate with the annular ring 50.

[0052] Furthermore, the connecting pipe 52 between the middle tank 11 and the upper tank 11 is connected. The main shaft 20, the conical column 23 and the auger rod 30 are all provided with through grooves in the middle. A drive shaft 53 is slidably installed in the through groove. One end of the drive shaft 53 is located inside the middle tank 11. A U-shaped ring 54 is provided at the upper end of the drive shaft 53 to block one end of the connecting pipe 52. The drive shaft 53 can slide up and down in the through groove. During the sliding process, it can drive the U-shaped ring 54 to move synchronously. When the mixture reacts in the middle tank 11, a large amount of gas will be generated. The gas can enter the upper tank 11 through the connecting pipe 52. In the initial state, the upper end of the U-shaped ring 54 blocks the connecting pipe 52. When gas needs to enter the upper tank 11, the drive shaft 53 drives the U-shaped ring 54 to move in the direction of the annular ring 50.

[0053] The lower end of the U-shaped ring 54 is provided with an arc-shaped plate 55, and the upper end of the annular ring 50 is provided with an arc-shaped groove 56 corresponding to the arc-shaped plate 55. The drive shaft 53 can also rotate in the through groove and drive the U-shaped ring 54 to rotate synchronously. When the arc-shaped blade 51 needs to rotate, the U-shaped ring 54 drives the arc-shaped plate 55 to descend, and the arc-shaped plate 55 is inserted into the arc-shaped groove 56, which drives the annular ring 50 to rotate. When the U-shaped ring 54 drives the arc-shaped plate 55 to be inserted into the arc-shaped groove 56, its side wall will also seal the upper end of the connecting cylinder 24 to prevent gas from flowing back into the lower tank 11.

[0054] An arc plate 57 is provided on one side of the central tank 11. An opening and closing groove 58 is provided on the arc plate 57, and a receiving groove 59 extending into the arc plate 57 is provided on the inner wall of the opening and closing groove 58. A sealing plate 510 for sealing the opening and closing groove 58 is slidably provided in the receiving groove 59, and a lever 511 is provided on one side of the sealing plate 510. When the reaction is completed and it is necessary to clean the reactants in the central tank 11, the lever 511 is moved to move the sealing plate 510 in the receiving groove 59, so that the sealing plate 510 no longer seals the opening and closing groove 58. At this time, the arc blade 51 rotates in the direction of the outer diameter of the arc blade 51, and the reactants are discharged out of the tank 11 through the opening and closing groove 58.

[0055] Reference Figure 5As shown, the main shaft 20 passes through the lower end of the tank body 11 and is provided with a drive ring 60. The drive ring 60 is provided with a drive unit 6 for driving the main shaft 20 and the drive shaft 53 to rotate. Specifically, the drive unit 6 includes a drive ring 60, a push cylinder 61, a drive motor 62, an internal gear ring 63 and a drive gear 64. The push cylinder 61 is provided on the base plate 1. The extension end of the push cylinder 61 is provided with a drive motor 62 through a cylinder seat. The output end of the drive motor 62 is connected to the lower end of the drive shaft 53. The push cylinder 61 can push the drive motor 62 to move up and down. When the drive motor 62 moves, it can drive the drive shaft 53 to move up and down synchronously. The drive motor 62 can also provide rotational power to the drive shaft 53.

[0056] An internal gear ring 63 is provided on the inner wall of the drive ring 60. A drive gear 64 meshing with the internal gear ring 63 is sleeved on the output shaft of the drive motor 62. The drive motor 62 can drive the main shaft 20 to rotate synchronously through the internal gear ring 63 and the drive ring 60. When the drive shaft 53 needs to rotate, that is, after all the mixture in the lower tank 11 has entered the middle tank 11, the drive motor 62 is driven to descend by pushing the cylinder 61, so that the drive gear 64 no longer meshes with the internal gear ring 63. At this time, the drive shaft 53 will also drive the U-shaped ring 54 to descend synchronously, sealing the upper end of the connecting cylinder 24. At the same time, the bottom of the connecting pipe 52 is no longer sealed, so that the gas reacting in the middle tank 11 can enter the upper tank 11.

[0057] Reference Figure 6 As shown, a condensing assembly 7 for condensing the gas generated during the chemical reaction is provided on one side of both the upper and lower tanks 11. Specifically, the condensing assembly 7 includes a first bend 70, a second bend 71, a condenser 72, a discharge pipe 73, and a third bend 74. The first bend 70 is provided on one side of the lower tank 11 and extends into its interior. The second bend 71 is also provided on one side of the upper tank 11, with one end extending into its interior. The first bend 70 and the second bend 71 are connected together by a condenser 72. A discharge pipe 73 is provided on one side of the condenser 72 and is connected to the second bend 71 through the condenser 72. A third bend 74 is also provided on one side of the condenser 72 and is connected to the first bend 70 through the condenser 72.

[0058] The gases produced by the reaction in the two tanks 11 at the lower and upper ends can be discharged into the condenser 72 through the corresponding bend pipe 70 and bend pipe 71. The condenser 72 can condense the gases in bend pipe 70 and bend pipe 71 into liquid. Then the liquid in bend pipe 70 and bend pipe 71 will flow into the corresponding discharge pipe 73 and bend pipe 74. The connecting pipe 52 can be connected to existing equipment such as crystallizer, washing machine and dryer to obtain the finished product sodium hexafluorophosphate. The liquid discharged from bend pipe 74 is easy for workers to collect and reuse.

[0059] Example 2: Refer to Figure 7 As shown, based on Embodiment 1, in order to store chemical raw materials, a storage unit 8 is provided on the base plate 1; specifically, the storage unit 8 includes a storage tank 80, a feed pipe 81, a conveying pipe 82, a water pump 83, a rotating shaft 84, a swing rod 85, and a stirring plate 86. Several support columns 10 are provided on the base plate 1, and the storage tank 80 is provided on the upper end of the support columns 10. Similarly, the support columns 10 are used to support the storage tank 80.

[0060] Two feed pipes 81 are connected through the upper end of the storage tank 80, through which hydrogen fluoride and tetrapolyphosphoric acid can be filled into the storage tank 80 respectively. A conveying pipe 82 is connected through the storage tank 80 and the lower tank body 11, and a water pump 83 is connected through the middle of the conveying pipe 82. A rotating shaft 84 is also rotatably installed on the inner wall of the storage tank 80. Several swing rods 85 are evenly distributed along the extension of the rotating shaft 84 on the outer side of the rotating shaft 84. The swing rods 85 are away from the rotating shaft. A stirring plate 86 is provided at one end of the shaft 84, and one end of the bent pipe 70 is connected to one side of the storage tank 80. The rotating shaft 84 drives the swing rod 85 to swing synchronously. When the swing rod 85 rotates, it can drive the stirring plate 86 to swing synchronously, stirring the hydrogen fluoride and tetrapolyphosphoric acid in the storage tank 80 to achieve initial mixing. Then, the water pump 83 is started to pump the mixture of hydrogen fluoride and tetrapolyphosphoric acid into the lower tank 11 through the delivery pipe 82.

[0061] Reference Figure 8 As shown, in order to enable the rotating shaft 84 to rotate, a linkage assembly 9 is provided on the base plate 1 for indirect transmission; specifically, the linkage assembly 9 includes a linkage gear 90, a support plate 91, a transmission shaft 92 and a transmission gear 93. The linkage gear 90 is sleeved on the output shaft of the drive motor 62, that is, the drive motor 62 can drive the linkage gear 90 to rotate synchronously.

[0062] A support plate 91 is provided on the base plate 1. A transmission shaft 92 is provided on the upper end of the support plate 91. A transmission gear 93 that meshes with the linkage gear 90 is rotatably sleeved on the outside of the transmission shaft 92. The support plate 91 is used to support the transmission shaft 92. The transmission gear 93 can rotate on the outside of the transmission shaft 92. When the linkage gear 90 and the transmission gear 93 mesh, the transmission gear 93 can be driven to rotate synchronously.

[0063] Furthermore, one end of the rotating shaft 84 passes through the storage tank 80 and is connected to the transmission shaft 92 via belt drive. The transmission shaft 92 can drive the rotating shaft 84 to rotate synchronously via belt drive. When the drive motor 62 is driven by the cylinder 61 to move up and down, it can indirectly drive the linkage gear 90 to mesh with or disengage from the transmission gear 93.

[0064] During operation: First, hydrogen fluoride and tetrapolyphosphoric acid are poured into the storage tank 80 through the feed pipe 81 on the storage tank 80. Then, the two are stirred by the stirring plate 86 to achieve a preliminary mixture. Finally, the mixed hydrogen fluoride and tetrapolyphosphoric acid are discharged into the bottom tank 11 by the water pump 83.

[0065] Step 2: The hydrogen fluoride and tetrapolyphosphoric acid in the lower tank 11 are stirred again by the stirring unit 2, and the temperature in the tank 11 is adjusted to a suitable temperature with the help of the water temperature unit 4, so that the hydrogen fluoride and tetrapolyphosphoric acid can carry out a full chemical reaction.

[0066] Step 3: The chemically reacted mixture of hydrogen fluoride and tetrapolyphosphoric acid is then transferred to the middle tank 11 via the transfer component 3. The temperature inside the tank 11 is adjusted again by the water temperature unit 4 to generate a mixed gas of HPF6, PF5, and HF. The generated gas then enters the upper tank 11 through the connecting pipe 52. The temperature inside the upper tank 11 is then adjusted again by the water temperature unit 4 to ensure that the HPF6, PF5, and HF gases can react fully.

[0067] Step 4: The HPF6\PF5\HF mixed gas after the reaction will enter the condenser component 7 and condense into HPF6\PF5\HF mixed liquid, which will then enter the reactor. NaF\HF solution will be added to the reactor to react and generate HPF6\PF5\HF mixed material. The HPF6\PF5\HF mixed material will then be placed into the crystallizer, scrubber and dryer in the existing equipment to obtain the final NaPF6 product.

[0068] Step 5: The gases produced during the reaction of hydrogen fluoride and tetrapolyphosphoric acid in the lower tank 11 will be reintroduced into the storage tank through the condenser component 7 for repeated use, thus avoiding waste.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0070] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sodium hexafluorophosphate production apparatus, comprising a bottom plate (1) and a tank (11), characterized in that: The bottom plate (1) is provided with several support columns (10) at the upper end. Three tanks (11) are provided at equal intervals at the upper end of the support columns (10). The adjacent tanks (11) are connected by several arc-shaped support plates (12). The tanks (11) at the lower end are provided with a stirring unit (2) for preliminary mixing and stirring of chemical agents. The stirring unit (2) includes a main shaft (20) rotatably disposed in the lower tank (11), and a spiral blade (21) is provided on the outside of the main shaft (20), and the outside of the spiral blade (21) is in contact with the inner wall of the tank (11). One side of each of the three tanks (11) is provided with a water temperature unit (4) for regulating the internal temperature so that the chemical agent can react fully. The water temperature unit (4) includes an annular groove (40) inside the tank (11). Each tank (11) has a connecting pipe (41) with one end communicating with the annular groove (40) inside it. The ends of the connecting pipes (41) outside the tank (11) are connected to each other through a series pipe (42). The connecting pipe (41) in the middle section is provided with a partition plate (43) whose two ends are respectively attached to the inner walls of the corresponding annular groove (40) and the series pipe (42). Two rectangular boxes (44) are provided on the outside of the series pipe (42) respectively located on both sides of the connecting pipe (41) in the middle section. A circular groove is opened inside the rectangular box (44). Several semiconductor plates (45) are evenly distributed along their extension sections on the inner wall of the circular groove. The middle part of the semiconductor plate (45) is attached to the outer side of the series pipe (42). The lower tank (11) has a water injection pipe (46) with one end inserted inside it on the outside, and the upper tank (11) also has a water outlet (47) with one end inserted inside it on one side. The main shaft (20) passes through the lower end of the tank body (11) and is provided with a drive ring (60). The drive ring (60) is provided with a drive unit (6) for driving the main shaft (20) and the drive shaft (53) to rotate. The drive unit (6) includes a push cylinder (61) provided on the bottom plate (1). The extension end of the push cylinder (61) is provided with a drive motor (62) through the cylinder seat. The output end of the drive motor (62) is connected to the lower end of the drive shaft (53). An internal gear ring (63) is provided on the inner wall of the drive ring (60). A drive gear (64) meshing with the internal gear ring (63) is sleeved on the output shaft of the drive motor (62).

2. The sodium hexafluorophosphate production apparatus according to claim 1, characterized in that: The stirring unit (2) further includes an annular cone (22) disposed on the inner wall of the lower tank (11), and a conical column (23) with an outer side corresponding to the inner wall of the annular cone (22) is disposed at the upper end of the main shaft (20). A spiral blade (21) that is attached to the inner wall of the annular cone (22) is also disposed on the outer side of the conical column (23). A connecting cylinder (24) is provided between the lower tank (11) and the middle tank (11).

3. The sodium hexafluorophosphate production apparatus according to claim 2, characterized in that: The connecting cylinder (24) is provided with a transmission component (3) for transferring the chemical agent in the lower tank (11) to the middle tank (11). The transmission component (3) includes an auger rod (30) disposed at the upper end of the conical column (23) and located in the connecting cylinder (24). The upper end of the connecting cylinder (24) is located inside the middle tank (11), and the upper end of the auger rod (30) is higher than the upper end of the connecting cylinder (24).

4. A sodium hexafluorophosphate production apparatus according to claim 2 or 3, characterized in that: The outer side of the connecting cylinder (24) is also provided with a stirring element (5) for stirring the chemical mixture so that the mixture reacts fully. The stirring element (5) includes an annular ring (50) rotatably sleeved on the outer side of the connecting cylinder (24). Several arc-shaped blades (51) are evenly distributed along its axis on the outer side of the annular ring (50). The connecting pipe (52) between the middle tank (11) and the upper tank (11) is connected through. The main shaft (20), the conical column (23) and the auger rod (30) are all provided with through grooves in the middle. A drive shaft (53) is slidably arranged in the through groove. One end of the drive shaft (53) is located inside the middle tank (11). A U-shaped ring (54) is provided at the upper end of the drive shaft (53) to seal one end of the connecting pipe (52).

5. A sodium hexafluorophosphate production apparatus according to claim 4, characterized in that: The lower end of the U-shaped ring (54) is provided with an arc plate (55), and the upper end of the annular ring (50) is provided with an arc groove (56) corresponding to the arc plate (55); An arc plate (57) is provided on one side of the middle tank (11). An opening and closing groove (58) is provided on the arc plate (57), and a storage groove (59) is provided on the inner wall of the opening and closing groove (58) that extends into the arc plate (57). A sealing plate (510) for sealing the opening and closing groove (58) is slidably provided in the storage groove (59), and a lever plate (511) is provided on one side of the sealing plate (510).

6. The sodium hexafluorophosphate production apparatus according to claim 1, characterized in that: A condensing assembly (7) for condensing the gas generated during the chemical reaction is provided on one side of the two tanks (11) above and below. The condensing assembly (7) includes a bent pipe (70) provided on one side of the lower tank (11) and extending into its interior. A bent pipe (71) with one end extending into its interior is also provided on one side of the upper tank (11). A condenser (72) is connected between the bent pipe (70) and the bent pipe (71).

7. A sodium hexafluorophosphate production apparatus according to claim 6, characterized in that: The condenser (72) is provided with a discharge pipe (73) on one side, and the discharge pipe (73) is connected to the second bent pipe (71) through the condenser (72). The condenser (72) is also provided with a third bent pipe (74) on one side, and the third bent pipe (74) is connected to the first bent pipe (70) through the condenser (72).

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