Drying system for preparing high-strength phosphogypsum

Abstract

The utility model relates to the technical field of ardealite, and discloses a drying system for preparing high-strength ardealite, the drying system comprises a tank body and a drying tank, the upper end of the outer part of a second rotating shaft is fixedly connected with two supporting rods arranged in a mirror image distribution manner, and one side of the bottom end of each supporting rod is fixedly connected with a scattering plate; the bottom end of the outer wall of the second rotating shaft is fixedly connected with a spiral blade, the bottom end of the interior of the drying tank is fixedly connected with an air distribution plate, and the upper end of the air distribution plate is fixedly connected with a plurality of air columns arranged in an annular array. According to the drying system for preparing the high-strength phosphogypsum, a second rotating shaft at the upper end in the drying tank and supporting rods and scattering plates on the second rotating shaft can further crush and disperse materials, so that the materials are prevented from caking, and the drying efficiency is improved; the design of the air distribution plate at the bottom end in the drying tank, the vent holes, the air columns and the air nozzles on the air distribution plate can ensure that hot air is uniformly distributed in the drying tank, so that materials can be fully exposed in the hot air, and the drying quality is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of phosphogypsum, in particular to a drying system for preparing high-strength phosphogypsum. BACKGROUND

[0002] The steam pressure method is also called the pressurized steam method, and the process flow is as follows: the two-water gypsum of a certain size is placed in a steam pressure kettle, saturated water vapor is introduced, and the two-water gypsum is converted into alpha type hemihydrate gypsum under certain temperature and pressure for a certain time, and then the alpha type hemihydrate gypsum is obtained by drying and grinding, and the process flow is as follows: the two-water gypsum is coarsely crushed, pressurized hydrothermal treatment is carried out at 2-8 atmospheres for 1.0-1.5 hours, normal pressure drying is carried out at 90-160 DEG C for 9-3 hours, and then the hemihydrate gypsum is obtained by grinding.

[0003] The existing patent (publication number: CN208282499U) discloses a drying system for preparing high-strength phosphogypsum, which comprises a spiral elevator, the discharge port of the spiral elevator is communicated with the feeding port of a first drying device, the discharge port of the first drying device is communicated with the feeding port of a second drying device through a spiral conveyor and a bucket elevator, the first drying device is in a horizontal tank structure, and a mixing cavity is arranged in the first drying device; a first stirring shaft and a second stirring shaft are arranged in the mixing cavity; the first stirring shaft is driven by a first motor, the second stirring shaft is driven by a second motor, stirring blades are arranged on the first stirring shaft and the second stirring shaft, and the movement directions of the first stirring shaft and the second stirring shaft are opposite.

[0004] The above-mentioned comparative document points out that the device dries the semi-finished product blocks after steam pressure through the first drying device, the two stirring shafts are arranged in opposite directions, the semi-finished product is broken while being dried, and the pre-pulverizing treatment is carried out for the later pulverizing system, and energy consumption is saved, but the internal drying device of the device may cause uneven distribution of hot air or the stirring effect of the stirring shaft is not ideal, which may cause low drying efficiency, incomplete drying of part of the materials, low heating mode and energy utilization efficiency of the drying device, and thus the overall energy consumption may still be large. Practical new type content

[0005] In view of the defects of the prior art, the application provides a drying system for preparing high-strength phosphogypsum, which has the advantages of improving drying efficiency, and solves the problems that the internal drying device of the device may cause uneven distribution of hot air or the stirring effect of the stirring shaft is not ideal, which may cause low drying efficiency, incomplete drying of part of the materials, low heating mode and energy utilization efficiency of the drying device, and thus the overall energy consumption may still be large.

[0006] To achieve the above object, the application provides the following technical scheme: a drying system for preparing high-strength phosphogypsum, comprising a tank body and a drying tank, the tank body is fixedly connected with a heating pipe on the outer wall, the tank body is fixedly connected with a heat insulation sleeve on the outer wall, the upper end of the tank body is fixedly connected with an upper cover through bolts, the upper end of the upper cover is fixedly connected with a high-pressure air pump, the bottom end of the upper cover is rotatably connected with a first rotating shaft, and the bottom end of the first rotating shaft is fixedly connected with stirring blades;

[0007] The second rotating shaft is rotatably connected to the inner upper end of the drying tank, two support rods are fixedly connected to the outer upper end of the second rotating shaft in a mirror image arrangement, a scattering plate is fixedly connected to the bottom end of each support rod, a spiral blade is fixedly connected to the outer bottom end of the second rotating shaft, a wind distribution plate is fixedly connected to the inner bottom end of the drying tank, a plurality of air vents are arranged in a ring array and are arranged in the inner part of the wind distribution plate, a plurality of air columns are fixedly connected to the upper end of the wind distribution plate in a ring array, a plurality of jet nozzles are fixedly connected to the outer wall of the air columns in a straight line array, and a hot air box is fixedly connected to one side of the outer wall of the drying tank.

[0008] Through the above scheme, the heating pipe fixedly connected to the outer wall of the tank body can rapidly heat the inside of the tank body, providing the required temperature conditions for the reaction, the heat insulation sleeve effectively reduces heat loss, improves energy utilization, reduces energy consumption, the first rotating shaft rotatably connected to the bottom end of the cover and the stirring blades thereon can fully stir the material in the tank body, ensuring uniform heating of the material, the second rotating shaft at the inner upper end of the drying tank and the support rods and scattering plates thereon can further crush and disperse the material, preventing material clumping and improving drying efficiency, the design of the wind distribution plate at the inner bottom end of the drying tank and the air vents, air columns and jet nozzles thereon can ensure uniform distribution of hot air in the drying tank, allowing the material to be fully exposed to hot air, improving drying quality, and the system is suitable for the drying process of preparing high-strength phosphogypsum and may also be suitable for drying other similar materials.

[0009] Further, shaft flow fans are fixedly connected to the upper ends of both sides of the hot air box, a plurality of heating wires are fixedly connected to the inside of the hot air box in a rectangular array, air outlet pipes are fixedly connected to the bottom ends of both sides of the hot air box, connection pipes are fixedly connected to the sides of the air outlet pipes away from the hot air box, two air inlet pipes are fixedly connected to the bottom ends of both sides of the drying tank in a mirror image arrangement, and the connection pipes are fixedly connected to the air inlet pipes away from the air outlet pipes.

[0010] The heating wire arranged in the hot air box can rapidly heat air to generate hot air, and the axial flow fan is used to send the heated hot air into the drying tank through the air outlet pipe and the connecting pipe, the heating wire is arranged in a rectangular array to ensure uniform heating of the air in the hot air box, and the strong wind power of the axial flow fan can rapidly send the heated hot air into the drying tank, thereby improving the drying efficiency.

[0011] Further, the drying tank is fixedly connected with an exhaust pipe at the upper end, and is fixedly connected with a discharge pipe at the bottom end.

[0012] Through the above scheme, the exhaust pipe at the upper end of the drying tank ensures that the gas in the system can be discharged in time, avoids the safety hidden danger caused by the excessive internal pressure, and can also be used for discharging steam or waste gas generated in the drying process, so that the system is kept clean and dry, and the discharge pipe at the bottom end of the drying tank can conveniently discharge the dried material out of the system for subsequent collection and treatment.

[0013] Further, the tank body is fixedly connected with a discharge pipe at the bottom end.

[0014] Through the above scheme, the discharge pipe at the bottom end of the tank body can stably discharge the material after the reaction in the tank body is completed, and by controlling the valve of the discharge pipe, the discharge speed and quantity of the material can be accurately adjusted to ensure the continuity and stability of the production process.

[0015] Further, the discharge pipe is fixedly connected with a first screw conveyor at the bottom end, the first screw conveyor is fixedly connected with a second screw conveyor away from the feeding pipe, and the second screw conveyor is fixedly connected with a feeding pipe at the outer wall upper end.

[0016] Through the above scheme, the first screw conveyor and the second screw conveyor can continuously and stably convey the material after the reaction, and such an automatic material conveying mode not only improves the production efficiency, but also reduces the dependence on manual operation.

[0017] Further, the discharge pipe is fixedly connected with the drying tank away from the second screw conveyor.

[0018] Through the above scheme, the discharge pipe directly connects the tank body with the drying tank, so that the material can be conveyed into the drying tank after the reaction.

[0019] Further, the upper cover is fixedly connected with a feeding pipe at the upper end on one side, and the feeding pipe is threadedly connected with a sealing cover away from the upper cover.

[0020] Through the above scheme, the design of the feeding pipe at the top end of the upper cover allows the material to be conveniently added to the tank body, improving the convenience of operation, and the threaded connection of the sealing cover and the feeding pipe ensures the sealing during the material adding process.

[0021] Further, the plurality of air holes correspond to the air columns.

[0022] Through the above scheme, the corresponding relationship between the air holes and the air columns ensures that the hot air can be more uniformly distributed inside the drying tank. When the hot air enters the air column through the air hole, the guiding effect of the air column allows the hot air to flow along a specific path, avoiding the diffusion of the hot air inside the drying tank. This design improves the utilization rate of the hot air, allowing the material to be more fully exposed to the hot air, thereby improving the drying efficiency and quality.

[0023] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0024] The drying system for preparing high-strength phosphogypsum can rapidly heat the inside of the tank body through the heating pipe fixedly connected to the outer wall of the tank body, providing the required temperature conditions for the reaction. The setting of the heat insulation sleeve effectively reduces heat loss, improves energy utilization, and reduces energy consumption. The first rotating shaft rotatably connected to the bottom end of the cover and the stirring blades thereon can fully stir the material inside the tank body, ensuring uniform heating of the material. The second rotating shaft at the upper end inside the drying tank and the support rods and dispersing plates thereon can further crush and disperse the material, preventing clumping and improving drying efficiency. The design of the air holes, air columns, and air jets at the bottom end inside the drying tank ensures uniform distribution of hot air in the drying tank, allowing the material to be fully exposed to the hot air and improving drying quality. This system is suitable for the drying process of preparing high-strength phosphogypsum and may also be suitable for drying other similar materials. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The figure is a schematic diagram of the overall structure of the structure of the present application;

[0026] Figure 2 The figure is a schematic diagram of the structure of the autoclave of the present application;

[0027] Figure 3 The figure is a schematic diagram of the structure of the drying tank of the present application;

[0028] Figure 4 The figure is a schematic diagram of the structure of the hot air box of the present application.

[0029] In the figure:

[0030] 1, tank; 2, drying tank; 3, heating pipe; 4, heat insulation sleeve; 5, upper cover; 6, high-pressure air pump; 7, first rotating shaft; 8, stirring blade; 9, second rotating shaft; 10, support rod; 11, dispersing plate; 12, helical blade; 13, air distribution plate; 14, air hole; 15, air column; 16, air jet; 17, hot air box; 18, axial flow fan; 19, heating wire; 20, air outlet pipe; 21, connecting pipe; 22, air inlet pipe; 23, exhaust pipe; 24, discharge pipe; 25, discharge pipe; 26, first screw conveyor; 27, second screw conveyor; 28, feed pipe; 29, feeding pipe; 30, sealing cover. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0032] Please refer to Figure 1 , Figure 2 and Figure 3 , a drying system for preparing high-strength phosphogypsum in the embodiment, comprising a tank 1 and a drying tank 2, the outer wall of the tank 1 is fixedly connected with a heating pipe 3, the outer wall of the tank 1 is fixedly connected with a heat insulation sleeve 4, the heating pipe 3 fixedly connected with the outer wall of the tank 1 can quickly heat the inside of the tank 1, providing the temperature conditions required for reaction, the setting of the heat insulation sleeve 4 effectively reduces the heat loss, improves the energy utilization rate, reduces the energy consumption, the upper end of the tank 1 is fixedly connected with an upper cover 5 through bolts, the upper end of the upper cover 5 is fixedly connected with a high-pressure air pump 6, the bottom end of the upper cover 5 is rotatably connected with a first rotating shaft 7, the bottom end of the first rotating shaft 7 is fixedly connected with a stirring blade 8, the first rotating shaft 7 rotatably connected with the bottom end of the cover and the stirring blade 8 thereon can fully stir the material in the tank 1, ensuring uniform heating of the material.

[0033] Please refer to Figure 3The second rotating shaft 9 is fixedly connected with two support rods 10 which are mirror image distributed, and the bottom side of each support rod 10 is fixedly connected with a scattering plate 11. The bottom end of the outer wall of the second rotating shaft 9 is fixedly connected with a spiral blade 12. The second rotating shaft 9 and the support rods 10 and the scattering plates 11 on the upper end of the inside of the drying tank 2 can further crush and disperse the materials, prevent the materials from caking, and improve the drying efficiency. The bottom end of the inside of the drying tank 2 is fixedly connected with a wind distribution plate 13. A plurality of air holes 14 are arranged in the form of a ring array inside the wind distribution plate 13. The upper end of the wind distribution plate 13 is fixedly connected with a plurality of air columns 15 arranged in the form of a ring array. The outer wall of the air column 15 is fixedly connected with a plurality of jet nozzles 16 arranged in the form of a straight line array. The outer wall of one side of the drying tank 2 is fixedly connected with a hot air box 17. The bottom end of the inside of the drying tank 2 is fixedly connected with the wind distribution plate 13, the air holes 14, the air columns 15 and the jet nozzles 16. The design can ensure that the hot air is evenly distributed in the drying tank 2, so that the materials can be fully exposed to the hot air, and the drying quality is improved.

[0034] Please refer to Figure 1 and Figure 4 The upper end of each side of the hot air box 17 is fixedly connected with an axial flow fan 18. A plurality of heating wires 19 are arranged in the form of a rectangular array inside the hot air box 17. The bottom end of each side of the hot air box 17 is fixedly connected with an air outlet pipe 20. Each side of the air outlet pipe 20 away from the hot air box 17 is fixedly connected with a connecting pipe 21. The bottom end of the outer wall of the drying tank 2 is fixedly connected with two air inlet pipes 22 arranged in the form of a mirror image. One end of each connecting pipe 21 away from the air outlet pipe 20 is fixedly connected with the air inlet pipe 22. The heating wires 19 arranged inside the hot air box 17 can quickly heat the air to generate hot air. The axial flow fan 18 functions to send the heated hot air into the drying tank 2 through the air outlet pipe 20 and the connecting pipe 21. The heating wires 19 are arranged in the form of a rectangular array, which ensures the uniform heating of the air inside the hot air box 17, avoids local overheating or insufficient temperature, and the strong wind power of the axial flow fan 18 can quickly send the heated hot air into the drying tank 2, improving the drying efficiency. The upper end of the drying tank 2 is fixedly connected with an exhaust pipe 23, and the bottom end of the drying tank 2 is fixedly connected with a discharge pipe 24. The design of the exhaust pipe 23 on the upper end of the drying tank 2 ensures that the gas inside the system can be discharged in time, avoiding safety hazards caused by excessive internal pressure. The exhaust pipe 23 can also be used to discharge steam or waste gas generated during the drying process, keeping the inside of the system clean and dry. The design of the discharge pipe 24 at the bottom end of the drying tank 2 allows the dried materials to be easily discharged from the system, facilitating subsequent collection and processing. The discharge pipe is provided with a valve, which can control the discharge speed and quantity of the materials, ensuring that the materials can be uniformly and stably discharged.

[0035] Please refer to Figure 1 , Figure 3 and Figure 4The bottom end of the tank body 1 is fixedly connected with a discharge pipe 25. The design of the discharge pipe 25 at the bottom end of the tank body 1 enables the material to be stably discharged after the reaction in the tank body 1 is completed. By controlling the valve of the discharge pipe 25, the discharge speed and quantity of the material can be accurately adjusted, ensuring the continuity and stability of the production process. The bottom end of the discharge pipe 25 is fixedly connected with a first screw conveyor 26. The side of the first screw conveyor 26 away from the feeding pipe 28 is fixedly connected with a second screw conveyor 27. The outer wall of the second screw conveyor 27 is fixedly connected with the feeding pipe 28 at the upper end. The first screw conveyor 26 and the second screw conveyor 27 enable the material to be continuously and stably conveyed after the reaction is completed. This automatic material conveying method not only improves the production efficiency but also reduces the dependence on manual operation. The end of the discharge pipe 25 away from the second screw conveyor 27 is fixedly connected with a drying tank 2. The discharge pipe 25 directly connects the tank body 1 with the drying tank 2, ensuring that the material is conveyed into the drying tank 2 after the reaction. The upper end of the upper cover 5 is fixedly connected with a feeding pipe 29 on one side. The side of the feeding pipe 29 away from the upper cover 5 is threadedly connected with a sealing cover 30. The design of the feeding pipe 29 at the top end of the upper cover 5 enables the material to be conveniently added to the tank body 1, improving the convenience of operation. The thread connection of the sealing cover 30 and the feeding pipe 29 ensures the sealing during the material adding process. The plurality of air vents 14 correspond to the air columns 15. The corresponding relationship between the air vents 14 and the air columns 15 ensures that the hot air can be more uniformly distributed in the drying tank 2. When the hot air enters the air column 15 through the air vent 14, the guiding action of the air column 15 enables the hot air to flow along a specific path, avoiding the diffusion of the hot air in the drying tank 2. This design improves the utilization rate of the hot air, enabling the material to be more fully exposed to the hot air, thereby improving the drying efficiency and quality.

[0036] In the present embodiment, the drying system for preparing high-strength phosphogypsum can rapidly heat the inside of the tank body 1 through the heating pipe 3 fixedly connected to the outer wall of the tank body 1, providing the required temperature conditions for the reaction. The setting of the heat insulation sleeve 4 effectively reduces heat loss, improves energy utilization, and reduces energy consumption. The first rotating shaft 7 rotatably connected to the bottom end of the cover and the stirring blades 8 thereon can fully stir the material in the tank body 1, ensuring uniform heating of the material. The second rotating shaft 9 at the upper end inside the drying tank 2 and the support rods 10 and the dispersing plate 11 thereon can further crush and disperse the material, preventing material clumping and improving drying efficiency. The air distribution plate 13 at the bottom end inside the drying tank 2 and the air vents 14, air columns 15, and air jets 16 thereon are designed to ensure that the hot air is uniformly distributed in the drying tank 2, enabling the material to be fully exposed to the hot air and improving drying quality. This system is suitable for the drying process of preparing high-strength phosphogypsum and may also be suitable for drying other similar materials.

[0037] It should be noted that the first rotating shaft 7 and the second rotating shaft 9 are both driven by motors, and the spiral blades 12 rotate in the drying oven, so that the materials can be stirred in the drying oven.

[0038] The working principle of the above embodiment is:

[0039] First, the phosphogypsum material to be dried is added to the tank body 1 through the feeding pipe 29 at the top of the upper cover 5. The side of the feeding pipe 29 away from the upper cover 5 is threadedly connected with a sealing cover 30 to ensure the sealing during the material addition process. The heating pipe 3 fixedly connected to the outer wall of the tank body 1 starts to work, quickly heating the inside of the tank body 1 to provide the temperature conditions required for the reaction. At the same time, the outer wall of the tank body 1 is also fixedly connected to a heat insulation sleeve 4, which effectively reduces heat loss and improves energy utilization. Inside the tank body 1, the first rotating shaft 7 starts to rotate through the motor drive, and the stirring blades 8 thereon fully stir the material to ensure that the material is heated evenly. The discharge pipe 25 at the bottom end of the tank body 1 is designed so that the material can be discharged stably after the reaction inside the tank body 1 is completed. By controlling the valve of the discharge pipe 25, the discharge speed of the material can be accurately adjusted. The material enters the first screw conveyor 26 through the discharge pipe 25 and is then transported to the second screw conveyor 27. The upper end of the outer wall of the second screw conveyor 27 is fixedly connected with a feeding pipe 28. The material The material enters the drying tank 2 through the feed pipe 28. Inside the drying tank 2, the second rotating shaft 9 is driven by the motor to start rotating. The support rod 10 and the scattering plate 11 on it further crush and disperse the material, prevent the material from agglomerating, and improve the drying efficiency. The heating wire 19 equipped in the hot air box 17 quickly heats the air to generate hot air. The axial flow fan 18 sends the heated hot air into the drying tank 2 through the outlet pipe 20 and the connecting pipe 21. The air distribution plate 13 at the bottom end of the drying tank 2 and the air vents 14, air column 15 and air nozzle 16 on it are designed to ensure that the hot air is evenly distributed in the drying tank 2, so that the material can be fully exposed to the hot air. The material is stirred and dried in the drying tank 2. The rotation of the spiral blades 12 helps to evenly heat and dry the material. The steam or exhaust gas generated during the drying process is discharged from the system through the exhaust pipe 23 at the upper end of the drying tank 2, avoiding safety hazards caused by excessive internal pressure. After drying is completed, the material is discharged from the system through the discharge pipe 24 at the bottom end of the drying tank 2 for subsequent collection and processing.

[0040] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the enclosed claims. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the application can be varied in a multitude of ways. Such alterations, many of which will be apparent to those skilled in the art, can be based on current technology, and as such, this application should not be limited to the particular embodiments described herein, but should be understood to include all embodiments that are within the scope of the appended claims and their equivalents.

[0041] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, which can be limited only by the scope of the appended claims and their equivalents.

Claims

1. A drying system for preparing high-strength phosphogypsum, comprising a tank body (1) and a drying tank (2), characterized in that: The outer wall of the tank body (1) is fixedly connected to a heating tube (3), the outer wall of the tank body (1) is fixedly connected to a heat insulating sleeve (4), the upper end of the tank body (1) is fixedly connected to an upper cover (5) by bolts, the upper end of the upper cover (5) is fixedly connected to a high-pressure air pump (6), the bottom end of the upper cover (5) is rotatably connected to a first rotating shaft (7), and the bottom end of the first rotating shaft (7) is fixedly connected to a stirring blade (8); The upper end of the interior of the drying tank (2) is rotatably connected to a second rotating shaft (9), the upper end of the outer side of the second rotating shaft (9) is fixedly connected to two support rods (10) arranged in a mirror-image distribution, one side of the bottom end of each of the two support rods (10) is fixedly connected to a scattering plate (11), the lower end of the outer wall of the second rotating shaft (9) is fixedly connected to a spiral blade (12), the lower end of the interior of the drying tank (2) is fixedly connected to an air distribution plate (13), a plurality of vents (14) arranged in a circular array are provided through the interior of the air distribution plate (13), a plurality of air columns (15) arranged in a circular array are fixedly connected to the upper end of the air distribution plate (13), a plurality of air nozzles (16) arranged in a linear array are fixedly connected to the outer walls of the plurality of air columns (15), and a hot air box (17) is fixedly connected to one side of the outer wall of the drying tank (2).

2. A drying system for preparing high-strength phosphogypsum according to claim 1, characterized in that: The upper ends of both sides of the hot air box (17) are fixedly connected to axial flow fans (18), a plurality of heating wires (19) arranged in a rectangular array are fixedly connected inside the hot air box (17), the bottom ends of both sides of the hot air box (17) are fixedly connected to air outlet pipes (20), and the two air outlet pipes (20) are fixedly connected to connecting pipes (21) on the sides away from the hot air box (17), and the bottom end of the outer wall of the drying tank (2) is fixedly connected to two air inlet pipes (22) arranged in a mirror image distribution, and the ends of the two connecting pipes (21) away from the air outlet pipe (20) are fixedly connected to the air inlet pipe (22).

3. A drying system for preparing high-strength phosphogypsum according to claim 1, characterized in that: The upper end of the drying tank (2) is fixedly connected to an exhaust pipe (23), and the bottom end of the drying tank (2) is fixedly connected to a discharge pipe (24).

4. A drying system for preparing high-strength phosphogypsum according to claim 1, characterized in that: A discharge pipe (25) is fixedly connected to the bottom end of the tank body (1).

5. A drying system for preparing high-strength phosphogypsum according to claim 4, characterized in that: The bottom end of the discharge pipe (25) is fixedly connected to a first screw conveyor (26), a side of the first screw conveyor (26) away from the feed pipe (28) is fixedly connected to a second screw conveyor (27), and the upper end of the outer wall of the second screw conveyor (27) is fixedly connected to the feed pipe (28).

6. A drying system for preparing high-strength phosphogypsum according to claim 4, characterized in that: One end of the discharge pipe (25) away from the second screw conveyor (27) is fixedly connected to the drying tank (2).

7. A drying system for preparing high-strength phosphogypsum according to claim 1, characterized in that: A feeding pipe (29) is fixedly connected to one side of the upper end of the upper cover (5), and a sealing cover (30) is threadedly connected to the side of the feeding pipe (29) away from the upper cover (5).

8. A drying system for preparing high-strength phosphogypsum according to claim 1, characterized in that: The plurality of vent holes (14) all correspond to the air columns (15).

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