A desulfurization unit in phosphoric acid production

Abstract

This utility model discloses a desulfurization device for phosphoric acid production, including a device body, a phosphoric acid feed pipe, a powder feed pipe, and a discharge pipe. The phosphoric acid feed pipe is located on the left rear side of the device body, the powder feed pipe is located in front of the phosphoric acid feed pipe, and the discharge pipe is located on the left lower side of the device body. The device body also includes a tank and a mixing mechanism, which is located inside the tank. The powder feed pipe is also equipped with a feeding mechanism to feed the powder into the tank. The function of this utility model is to agitate the materials, increase the mixing effect, and improve the reaction rate. During the mixing process, the precipitate in the solution can be pretreated, reducing the burden on the centrifuge to separate the precipitate and improving work efficiency. Cleaning can be completed without opening the tank, saving time and labor. Furthermore, the feeding mechanism and the mixing mechanism are linked, saving energy.

Description

Technical Field

[0001] This utility model belongs to the field of phosphoric acid production technology, and in particular relates to a desulfurization device in phosphoric acid production. Background Technology

[0002] The wet process for producing phosphoric acid is a commonly used method. Its main steps include crushing, acid leaching, filtration, concentration, and crystallization of phosphate rock. In the process of removing sulfate ions from the solution through acid leaching, phosphate rock and barium carbonate are added to the phosphoric acid solution. After the reaction, phosphogypsum precipitate is generated to remove sulfate ions.

[0003] In the prior art, such as the desulfurization device for monoammonium phosphate production disclosed in Chinese Patent (CN219334221U), there are first tanks and second tanks, which are used for desulfurization in monoammonium phosphate production. The second tank is located above the first tank. An auxiliary mechanism is used to connect the first tank and the second tank. The auxiliary mechanism includes a fixed frame, multiple positioning rods, two connecting plates and two limiting blocks. The fixed frame is fixedly connected to the first tank. The positioning rods are slidably disposed on one side of the fixed frame. The limiting blocks are slidably disposed on one side of the connecting plates. The second tank has a square groove.

[0004] This method has the following drawbacks: First, after mixing the phosphoric acid solution and phosphate rock powder, the device lacks a stirring and mixing function for the materials entering the device, resulting in a low reaction rate and reduced production efficiency. Second, after the reaction is complete and the supernatant is discharged, the device needs to be manually opened to remove the phosphogypsum precipitate generated inside. This cleaning method is time-consuming, labor-intensive, and inefficient. Third, after the reaction is complete, the solution is discharged into a centrifuge for centrifugation. The phosphogypsum precipitate in the solution will be mixed in, reducing the centrifugal separation efficiency of the centrifuge.

[0005] Therefore, this paper provides a desulfurization device for phosphoric acid production. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model discloses a desulfurization device for phosphoric acid production. The device agitates the material, increases the mixing effect, and improves the reaction rate. During the mixing process, the precipitate in the solution can be pretreated, reducing the burden on the centrifuge to separate the precipitate and improving work efficiency. Cleaning can be completed without opening the tank, saving time and effort. Furthermore, the feeding mechanism and the mixing mechanism are linked, saving energy.

[0007] To achieve the above-mentioned technical effects, this utility model provides a desulfurization device for phosphoric acid production, including a device body, a phosphoric acid feed pipe, a powder feed pipe, and a discharge pipe. The phosphoric acid feed pipe is located on the left rear side of the device body, the powder feed pipe is located on the front side of the phosphoric acid feed pipe, and the discharge pipe is located on the lower left side of the device body. The device body also includes a barrel and a mixing and processing mechanism, which is located inside the barrel. The powder feed pipe is also equipped with a feeding mechanism to feed the powder into the barrel.

[0008] Preferably, a transparent observation window is provided on the left side surface of the barrel.

[0009] Preferably, the mixing and processing mechanism further includes a drive motor, a screen cylinder, a mounting frame, a chute, a spraying mechanism, and a sedimentation and collection mechanism. The screen cylinder with holes on its surface is located in the lower half of the barrel body. The drive motor is located on the right side of the screen cylinder, and the output end of the drive motor is connected to the mounting frame located on the inner side of the left end of the screen cylinder. The right end of the screen cylinder is slidably connected to the inside of the barrel body through a chute. The spraying mechanism is located above the screen cylinder, and the sedimentation and collection mechanism is located on the lower inner side of the screen cylinder. The drive motor is electrically connected to the control cabinet of the production workshop.

[0010] Preferably, the outer surface of the sieve cylinder is provided with a stirring plate.

[0011] Preferably, the spraying mechanism further includes a spray pipe and nozzles, with the spray pipe passing through the barrel and positioned above the screen cylinder, and the nozzles positioned below the spray pipe.

[0012] Preferably, the sedimentation collection mechanism further includes a sedimentation collection tank, a drain pipe, a return water pipe, and a ball valve. The sedimentation collection tank is located below the inner side of the screen cylinder, the drain pipe is located at the right end of the sedimentation collection tank and extends out of the tank body, the return water pipe is located below the drain pipe, the left end of the return water pipe is connected to the tank body, and the ball valve is located on the return water pipe.

[0013] Preferably, the feeding mechanism further includes a feeding cylinder, a conveying cylinder, an auger, a transmission wheel set a, a transmission rod, a mounting bracket, and a transmission wheel set b. The conveying cylinder is located on the left side of the powder feeding pipe, and the feeding cylinder is located above the left side of the powder feeding pipe. The auger is located inside the conveying cylinder. The transmission wheel set a is located on the left side of the conveying cylinder. The transmission wheel set a is driven by a transmission belt. The transmission wheel above the transmission wheel set a is coaxially and rotatably connected to the left end of the auger. The right side of the transmission wheel below the transmission wheel set a is connected to the transmission rod. The transmission rod passes through the mounting bracket and is rotatably located at the left end of the barrel. The transmission wheel set b is located between the drive motor and the transmission rod to drive the motor and the transmission rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The device is equipped with a mixing mechanism to agitate the materials, increase the mixing effect, and improve the reaction rate. During the mixing process, the precipitates in the solution can be pretreated, reducing the burden on the centrifuge to separate the precipitates and improving work efficiency. At the same time, a feeding mechanism is set up so that cleaning can be completed without opening the tank, saving time and effort. Furthermore, the feeding mechanism is linked with the mixing mechanism to save energy. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention;

[0017] Figure 2 This is the left view of this utility model;

[0018] Figure 3 yes Figure 2 A sectional view of section a.

[0019] Figure 4 yes Figure 2 A sectional view of section b in the middle;

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Phosphoric acid feed pipe; 2. Powder feed pipe; 3. Discharge pipe; 4. Barrel body; 5. Observation window; 6. Drive motor; 7. Screen cylinder; 8. Mounting bracket; 9. Slide chute; 10. Mixing plate; 11. Spray pipe; 12. Nozzle; 13. Sedimentation collection tank; 14. Sewage pipe; 15. Return water pipe; 16. Ball valve; 17. Feed cylinder; 18. Conveying cylinder; 19. Screw auger; 20. Transmission wheel set a; 21. Transmission rod; 22. Mounting bracket; 23. Transmission wheel set b. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] The prior art in this embodiment has the following problems: The inventors have found the following defects in the prior art: 1. After mixing phosphoric acid solution and phosphate rock powder, the device lacks a function to stir and mix the materials entering the device, resulting in a low reaction rate and reduced production efficiency; 2. After the material reaction is completed and the supernatant is discharged, the device needs to be opened to manually remove the phosphogypsum precipitate generated inside the device. This cleaning method is time-consuming, labor-intensive, and inefficient; 3. After the material reaction is completed, the solution is discharged into a centrifuge for centrifugation. The phosphogypsum precipitate in the solution will be mixed in and discharged, resulting in a lower centrifugal separation efficiency. Example 1

[0024] like Figures 1 to 4 As shown:

[0025] Therefore, the inventor provides a desulfurization device for phosphoric acid production, including a device body, a phosphoric acid feed pipe 1, a powder feed pipe 2, and a discharge pipe 3. The phosphoric acid feed pipe 1 is located on the left rear side of the device body, the powder feed pipe 2 is located on the front side of the phosphoric acid feed pipe 1, and the discharge pipe 3 is located on the lower left side of the device body. The device body also includes a barrel 4 and a mixing and processing mechanism, which is located inside the barrel 4. The powder feed pipe 2 is also provided with a feeding mechanism for feeding powder into the barrel 4.

[0026] Using the above method, phosphoric acid is fed into the barrel 4 through the phosphoric acid feed pipe 1. Then, phosphate rock powder and barium carbonate are fed into the feeding mechanism and sent into the barrel 4 through the powder feed pipe 2. The materials are stirred and fully reacted in the barrel 4 by the mixing and processing mechanism. After being fully mixed, the mixing and processing mechanism discharges the phosphogypsum. Then, the solution containing a small amount of impurities and sulfate ions is discharged from the discharge pipe 3 to the centrifuge for further processing. Example 2

[0027] like Figures 1 to 4 As shown:

[0028] Furthermore, a transparent observation window 5 is provided on the left side surface of the barrel 4;

[0029] When the mixing and processing mechanism processes materials, the stirring mechanism can observe the sedimentation and cleaning status of the upper part of the mixing and processing mechanism inside the tank 4 through the upper part of the observation window 5. The lower part of the observation window 5 can directly show the amount of sediment remaining in the solution inside the tank 4 and the reaction status of the materials. Example 3

[0030] like Figures 1 to 4 As shown:

[0031] Furthermore, the mixing and processing mechanism also includes a drive motor 6, a screen cylinder 7, a mounting frame 8, a chute 9, a spraying mechanism, and a sedimentation and collection mechanism. The screen cylinder 7, with holes on its surface, is located in the lower half of the tank body 4. The drive motor 6 is located on the right side of the screen cylinder 7, and the output end of the drive motor 6 is connected to the mounting frame 8 located on the inner side of the left end of the screen cylinder 7. The right end of the screen cylinder 7 is slidably connected to the inside of the tank body 4 through the chute 9. The spraying mechanism is located above the screen cylinder 7, and the sedimentation and collection mechanism is located on the lower inner side of the screen cylinder 7. The drive motor 6 is electrically connected to the production workshop control cabinet (not shown in the figure).

[0032] Furthermore, a stirring plate 10 is provided on the outer surface of the sieve cylinder 7;

[0033] Furthermore, the spraying mechanism also includes a spray pipe 11 and a nozzle 12. The spray pipe 11 passes through the barrel 4 and is positioned above the screen cylinder 7, while the nozzles 12 are respectively positioned below the spray pipe 11.

[0034] Furthermore, the sedimentation collection mechanism also includes a sedimentation collection tank 13, a drain pipe 14, a return water pipe 15, and a ball valve 16. The sedimentation collection tank 13 is located below the inner side of the screen cylinder 7. The drain pipe 14 is located at the right end of the sedimentation collection tank 13 and extends out of the tank body 4. The return water pipe 15 is located below the drain pipe 14. The left end of the return water pipe 15 is connected to the tank body 4. The ball valve 16 is located on the return water pipe 15.

[0035] After the material is conveyed into the barrel 4, the drive motor 6 drives the screen cylinder 7 to stir the material. The screen plate increases the stirring and mixing effect of the material, improving the reaction rate. During the mixing process, some material is carried upward by the screen cylinder 7 and falls into the sedimentation collection tank 13. The operator opens the ball valve 16 on the return water pipe 15 to guide the material back into the barrel 4 to prevent material waste. Then, the reaction of the material is observed through the observation window 5. When the material reaction is complete and no new sediment is produced, the ball valve 16 is closed, and spray water is introduced into the spray pipe 11. The spray water sprays clean water mist from top to bottom. The holes on the screen cylinder 7 and the stirring plate 10 will carry the solid phosphogypsum out of the material. The water mist sprays the attached phosphogypsum downward into the sedimentation collection tank 13. Gypsum is discharged from the drain pipe 14 into the sedimentation and recovery device for recycling. When it is observed from the observation window 5 that most of the sediment in the tank has been removed, the operator opens the discharge pipe 3 to discharge the material from the discharge pipe 3 into the centrifuge. At this time, most of the sediment in the solution is removed, reducing the burden on the centrifuge to separate sediment and improving work efficiency. When it is necessary to clean the inside of the tank 4, cleaning water is poured into the feeding mechanism. After the cleaning water is cleaned by the rotation of the screen cylinder 7, the impurities attached to the inside of the tank 4 are washed off and discharged through the discharge pipe 3 into the wastewater recovery device to complete the cleaning. In this way, the sediment in the solution can be pre-treated during the mixing process, and the cleaning can be completed without opening the tank 4, saving time and effort. Example 4

[0036] like Figures 1 to 4 As shown:

[0037] Furthermore, the feeding mechanism also includes a feeding cylinder 17, a conveying cylinder 18, an auger 19, a transmission wheel set a20, a transmission rod 21, a mounting bracket 22, and a transmission wheel set b23. The conveying cylinder 18 is located on the left side of the powder feeding pipe 2, the feeding cylinder 17 is located above the left side of the powder feeding pipe 2, the auger 19 is located inside the conveying cylinder 18, the transmission wheel set a20 is located on the left side of the conveying cylinder 18, the transmission wheel set a20 is driven by a transmission belt, the transmission wheel above the transmission wheel set a20 is coaxially and rotatably connected to the left end of the auger 19, the right side of the transmission wheel below the transmission wheel set a20 is connected to the transmission rod 21, the transmission rod 21 passes through the mounting bracket 22 and is rotatably located at the left end of the barrel 4, and the transmission wheel set b23 is located between the drive motor 6 and the transmission rod 21 to drive the motor 6 and the transmission rod 21.

[0038] When the drive motor 6 rotates, the transmission wheel set b23 synchronizes the power of the drive motor 6 to the transmission rod 21. The transmission rod 21 rotates on the mounting bracket 22, driving the transmission wheel set b23 to transmit the power to the left end of the auger 19 inside the conveying cylinder 18, causing the auger 19 to rotate and push the phosphate rock powder and barium carbonate put in from the feed cylinder 17 to the right into the barrel 4. This facilitates the conveying of solid materials while linking with the mixing and processing mechanism, saving energy.

[0039] In summary, this device is equipped with a mixing mechanism to agitate the materials, thereby increasing the mixing effect and improving the reaction rate. During the mixing process, the precipitates in the solution can be pretreated, reducing the burden on the centrifuge to separate the precipitates and improving work efficiency. At the same time, a feeding mechanism is provided, which can complete the cleaning without opening the tank 4, saving time and effort. Furthermore, the feeding mechanism is linked with the mixing mechanism, saving energy.

[0040] The working principle of this utility model:

[0041] Phosphoric acid is fed into the barrel 4 through the phosphoric acid feed pipe 1. The drive motor 6 rotates, and the transmission wheel set b23 synchronizes the power of the drive motor 6 to the transmission rod 21. The transmission rod 21 rotates on the mounting bracket 22, which drives the transmission wheel set b23 to transmit the power to the left end of the auger 19 inside the conveying cylinder 18. The auger 19 rotates and pushes the phosphate rock powder and barium carbonate fed from the feed cylinder 17 to the right into the barrel 4. This facilitates the conveying of solid materials while linking with the mixing and processing mechanism, saving energy.

[0042] After the material is conveyed into the barrel 4, the drive motor 6 drives the screen cylinder 7 to stir the material. The screen plate increases the stirring and mixing effect of the material and improves the reaction rate. During the mixing process, some of the material is driven by the screen cylinder 7 and falls into the sedimentation collection tank 13. The operator opens the ball valve 16 on the return water pipe 15 to guide the material back into the barrel 4 to prevent material waste. Then, the reaction of the material is observed through the observation window 5.

[0043] Once the material reaction is complete and no new precipitate is produced, close the ball valve 16 and introduce spray water into the spray pipe 11. The spray water sprays clean water mist from top to bottom. The holes on the screen cylinder 7 and the stirring plate 10 will carry the solid phosphogypsum out of the material. The water mist will spray the attached phosphogypsum downwards into the sedimentation collection tank 13. The phosphogypsum is discharged from the drain pipe 14 into the sedimentation recovery device for recycling. When it is observed from the observation window 5 that most of the precipitate in the tank has been removed, the operator opens the discharge pipe 3 to discharge the material from the discharge pipe 3 into the centrifuge (not shown in the figure). At this time, most of the precipitate in the solution is removed, reducing the burden of centrifuge separation of precipitate and improving work efficiency.

[0044] When it is necessary to clean the inside of the barrel 4, pour cleaning water into the feeding mechanism. After the cleaning water is cleaned by the rotation of the screen cylinder 7, it washes down the impurities attached to the inside of the barrel 4 and discharges them into the wastewater recycling device through the discharge pipe 3 to complete the cleaning. In this way, the sediment in the solution can be pretreated during the mixing process, and the cleaning can be completed without opening the barrel 4, saving time and effort.

[0045] This concludes the description of the working principle of the device.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A desulfurization device for phosphoric acid production, comprising a device body, a phosphoric acid feed pipe (1), a powder feed pipe (2), and a discharge pipe (3), wherein the phosphoric acid feed pipe (1) is located on the left rear side of the device body, the powder feed pipe (2) is located on the front side of the phosphoric acid feed pipe (1), and the discharge pipe (3) is located on the left lower side of the device body, characterized in that: The device body also includes a barrel (4) and a mixing mechanism, which is located inside the barrel (4); the powder feed pipe (2) is also provided with a feeding mechanism to feed the powder into the barrel (4).

2. A desulphurization device in phosphoric acid production according to claim 1 characterized in that: A transparent observation window (5) is also provided on the left side surface of the barrel (4).

3. A desulphurization device in phosphoric acid production according to claim 1 characterized in that: The mixing and processing mechanism also includes a drive motor (6), a screen cylinder (7), a mounting frame (8), a chute (9), a spraying mechanism, and a sedimentation and collection mechanism. The screen cylinder (7), which has holes on its surface, is located in the lower half of the barrel body (4). The drive motor (6) is located on the right side of the screen cylinder (7), and the output end of the drive motor (6) is connected to the mounting frame (8) located on the inner side of the left end of the screen cylinder (7). The right end of the screen cylinder (7) is slidably connected to the inside of the barrel body (4) through the chute (9). The spraying mechanism is located above the screen cylinder (7), and the sedimentation and collection mechanism is located on the lower inner side of the screen cylinder (7). The drive motor (6) is electrically connected to the control cabinet of the production workshop.

4. A desulphurization device in phosphoric acid production according to claim 3, characterized in that: The outer surface of the sieve cylinder (7) is provided with a stirring plate (10).

5. A desulphurization device in phosphoric acid production according to claim 3 characterized in that: The spraying mechanism also includes a spray pipe (11) and a nozzle (12). The spray pipe (11) passes through the barrel (4) and is located above the screen cylinder (7). The nozzles (12) are located below the spray pipe (11).

6. A desulphurization device in phosphoric acid production according to claim 3 characterized in that: The sedimentation collection mechanism also includes a sedimentation collection tank (13), a drain pipe (14), a return water pipe (15), and a ball valve (16). The sedimentation collection tank (13) is located below the inner side of the screen cylinder (7). The drain pipe (14) is located at the right end of the sedimentation collection tank (13) and extends out of the barrel body (4). The return water pipe (15) is located below the drain pipe (14). The left end of the return water pipe (15) is connected to the barrel body (4). The ball valve (16) is located on the return water pipe (15).

7. A desulphurization device in phosphoric acid production according to claim 1 characterized in that: The feeding mechanism also includes a feeding cylinder (17), a conveying cylinder (18), an auger (19), a transmission wheel set a (20), a transmission rod (21), a mounting bracket (22), and a transmission wheel set b (23). The conveying cylinder (18) is located on the left side of the powder feeding pipe (2), the feeding cylinder (17) is located above the left side of the powder feeding pipe (2), the auger (19) is located inside the conveying cylinder (18), the transmission wheel set a (20) is located on the left side of the conveying cylinder (18), the transmission wheel set a (20) is driven by a transmission belt, the transmission wheel above the transmission wheel set a (20) is coaxially rotatably connected to the left end of the auger (19), the right side of the transmission wheel below the transmission wheel set a (20) is connected to the transmission rod (21), the transmission rod (21) passes through the mounting bracket (22) and is rotatably located at the left end of the barrel (4), and the transmission wheel set b (23) is located between the drive motor (6) and the transmission rod (21) to drive the motor (6) and the transmission rod (21) in a linkage manner.

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