Production device and preparation method of controlled-release selenium fertilizer beneficial to crop absorption

Abstract

The invention discloses a production device and a preparation method of a sustained and controlled release selenium fertilizer beneficial to crop absorption, and relates to the field, the production device specifically comprises a tank body, a stirring rod, an atomization one-way nozzle, a rotary joint and a liquid storage box, and is characterized in that a top cover is mounted at the upper end of the tank body, and the stirring rod is mounted in the middle of the upper end of the top cover through a sealing bearing; a dual-purpose cavity is formed in the stirring rod, a plurality of stirring rods are installed on the two sides of the stirring rod, a cavity communicated with the dual-purpose cavity in the stirring rod is formed in each stirring rod, the upper end and the lower end of each stirring rod are each provided with an atomization one-way nozzle used for spraying a coating agent and conveying hot air, and the top of the stirring rod is communicated with a three-way pipe through a rotary connector. Through mutual cooperation of the stirring rod, the atomization one-way nozzle, the liquid storage tank, the drying box and the controller, the problem that selenium fertilizer is dissolved due to spraying in the prior art is avoided while the coating effect on selenium fertilizer particles placed in the tank body is achieved.

Description

Technical Field

[0001] The present invention relates to a field of selenium fertilizer production and a preparation method thereof. Background Art

[0002] Selenium fertilizer is an important agricultural input, primarily used to supplement selenium in the soil, thereby increasing the selenium content of agricultural products and meeting people's demand for selenium-rich agricultural products. Selenium is one of the essential trace elements for the human body and has multiple physiological functions such as antioxidant and immune enhancement. Examples include selenium-enriched rice, selenium-enriched strawberries, and selenium-enriched tea.

[0003] In order to help plants absorb selenium fertilizer, the fertilization method of watering with selenium-containing nutrient solution is gradually changed to the use of slow-release selenium fertilizer. It can use water to enter the porous semi-permeable membrane, that is, the membrane, and then the dissolved nutrient liquid diffuses to the outside of the membrane, thereby continuously supplying nutrients to crops. Compared with the method of watering with nutrient solution, its cost is reduced.

[0004] Currently, slow-release fertilizers are coated using water spraying, which can cause the fertilizer to dissolve, resulting in fertilizer loss and hindering crop absorption. Summary of the Invention

[0005] The purpose of the present invention is to provide a production device and a preparation method for a slow-release selenium fertilizer that is beneficial to crop absorption, so as to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0007] The present invention provides a slow-release selenium fertilizer production device that is beneficial to crop absorption, comprising a tank body, a stirring rod, an atomizing one-way nozzle, a rotary joint and a liquid storage tank, wherein a top cover is installed on the upper end of the tank body, a stirring rod is installed on the middle part of the upper end of the top cover through a sealed bearing, a plurality of stirring rods are installed on both sides of the stirring rod, each of the stirring rods is provided with a cavity connected to the dual-purpose cavity inside the stirring rod, and each stirring rod is provided with an atomizing one-way nozzle for spraying a coating agent and conveying hot air at the upper and lower ends, the top of the stirring rod is connected to a tee through a rotary joint, the air inlet end of the tee is connected to an air inlet valve, and the other end of the air inlet valve is connected to a heat-resistant air supply pipe;

[0008] The liquid inlet end of the three-way pipe is connected to the liquid inlet valve, and the other end of the liquid inlet valve is connected to the liquid discharge end of the feed pump through a liquid delivery pipe. The negative pressure end of the feed pump is passed through a negative pressure pipe to a liquid storage tank for holding the coating agent:

[0009] The upper end of the top cover is provided with a plurality of feeding holes in a ring shape for docking with the first electromagnetic discharge valve. The first electromagnetic discharge valve is fixed in a batching tank for storing slow-release selenium fertilizer particles. Brackets are fixed at the four corners of the bottom of the tank body. A second electromagnetic discharge valve is installed at the bottom of the tank body. A controller is installed on the outside of the tank body. A speaker is installed on the front side of the controller, and a time control panel is provided on the side end of the controller.

[0010] Preferably, a transmission gear is fixed to the outside of the top end of the stirring rod, one side of the transmission gear is meshed with the driving gear, and the driving gear is fixedly sleeved on the outside of the output shaft of the reduction motor, and the reduction motor is fixed to the top cover through an L-shaped bracket, and a dust cover is fixed to the side end of the L-shaped bracket, and the dust cover is arranged on the outside of the driving gear and the transmission gear, and a clearance hole is opened in the middle of the dust cover for placing the stirring rod and the output of the reduction motor.

[0011] Preferably, the liquid storage tank is fixed to one side of the tank body through a support block, and a liquid replenishing valve is connected to one side of the liquid storage tank through a pipeline, and the other end of the liquid replenishing valve is used to connect to an external pipe.

[0012] Preferably, the upper end of the top cover is further provided with an embedding hole for installing a pressure relief valve and an infrared temperature sensor.

[0013] Preferably, the bottom of the heat-resistant air supply pipe is connected to the interior of the drying box and to the air collecting hood. The drying box is fixed to the other side of the tank body by screws, and the interior of the drying box is respectively provided with inner cavities for placing the power heating network, the fan and the filter plate. The air supply end of the fan passes through the air supply pipe to the inner cavity for placing the electric heating network, and the electric heating network is fixed to the side wall of the inner cavity by a heat-resistant block.

[0014] Preferably, the negative pressure end of the fan is located above the first-level filter, the first-level filter is installed above the inner cavity for placing the filter plate, and a support plate is hinged below the inner cavity for placing the filter plate, and a through groove is opened in the middle of the support plate for installing the second-level filter.

[0015] Preferably, a mounting cavity for installing a fixing pin is provided on one side of the bottom of the drying box, a return spring is provided between the fixing pin and the mounting cavity, and the pin head of the fixing pin is used to contact the fixing hole on the side of the support plate.

[0016] The present invention provides a method for preparing a slow-release and controlled-release selenium fertilizer production device that is beneficial to crop absorption, comprising the following steps:

[0017] S1. Check whether the selenium fertilizer particles to be coated and the coating agent are sufficient;

[0018] S2. Start the switch of the first electromagnetic discharge valve, and the selenium fertilizer particles in the batching tank enter the interior of the tank. At this time, the clinker pump is used to pump the coating agent in the liquid storage tank to the dual-purpose chamber inside the stirring rod and spray the atomized coating agent onto the outside of the selenium fertilizer particles through the atomizing one-way nozzle. In this process, the reduction motor is used to drive the stirring rods on both sides of the stirring rod to turn the selenium fertilizer particles, thereby helping the selenium fertilizer particles to turn and contact with the atomized coating agent. In this process, the time control panel of the controller is used to input the spraying time of the coating agent;

[0019] S3. When the spraying time reaches a preset threshold, the spraying is stopped to prevent the selenium fertilizer particles from being dissolved by the liquid. At this time, the liquid inlet valve is closed and the air inlet valve is opened. At this time, the fan works to transport the outside air into the inner cavity where the electric heating net is placed. The air is heated to form hot air, which enters the dual-purpose cavity of the stirring rod and is then transported through the atomizing one-way nozzle to dry the film coated on the outside of the selenium fertilizer particles.

[0020] S4. In order to ensure the coating effect of the selenium fertilizer particles, the steps S2 and S3 can be repeated to coat the selenium fertilizer particles for the second time. After the processing is completed, the coated selenium fertilizer particles are discharged through the second electromagnetic discharge valve.

[0021] Compared with the existing technology, one or more of the above technical solutions have the following beneficial effects:

[0022] The present invention achieves a coating effect on the selenium fertilizer particles placed inside the tank body by cooperating with a stirring rod, an atomizing one-way nozzle, a liquid storage tank, a drying box and a controller, while avoiding the problem of selenium fertilizer dissolution caused by spraying in the prior art. That is, the time for conveying the coating agent by the liquid storage tank, the feed pump and the atomizing one-way nozzle is input through the controlled timing panel. After reaching the threshold, the feed pump stops working, and then the fan and the electric heating network in the drying box heat the air and convey it to the dual-purpose cavity inside the stirring rod and convey hot air through the atomizing one-way nozzle. In addition, during the hot air conveying process, the stirring rod is also used to turn the selenium fertilizer particles to ensure the hot air drying effect, thereby avoiding the situation where the selenium fertilizer particles are dissolved due to excessive humidity inside the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 This is a schematic diagram of the main cross-sectional structure of the parts in the present invention;

[0025] Figure 2 This is a schematic diagram of the internal parts structure of the drying box of the present invention;

[0026] Figure 3This is a schematic diagram of the structure of the combined parts of the liquid storage tank, the liquid replenishing valve and the feed pump in the present invention;

[0027] Figure 4 This is a schematic diagram of the top cover structure of the present invention from a top view;

[0028] Figure 5 yes Figure 1 A schematic diagram of the enlarged structure of the parts in the figure;

[0029] Figure 6 yes Figure 1 A magnified schematic diagram of the structure of part B;

[0030] Figure 7 yes Figure 2 The enlarged schematic diagram of the C part structure;

[0031] In the picture:

[0032] 1. Tank body; 2. Top cover; 3. Stirring rod; 4. Stirring rod; 5. Dual-purpose chamber; 6. Atomizing one-way nozzle; 7. Rotary joint; 8. Tee; 9. Inlet valve; 10. Heat-resistant air supply pipe; 11. Liquid inlet valve; 12. Liquid supply pipe; 13. Feed pump; 14. Liquid storage tank; 15. First electromagnetic discharge valve; 16. Feed hole; 17. Batching tank; 18. Second electromagnetic discharge valve; 19. Controller; 20. Speaker; 21. Timer Panel; 22. Transmission gear; 23. Drive gear; 24. Reducer motor; 25. L-shaped bracket; 26. Dust cover; 27. Liquid replenishing valve; 28. Pressure relief valve; 29. ​​Infrared temperature sensor; 30. Drying box; 31. Wind collecting hood; 32. Electric heating net; 33. Fan; 34. Filter plate; 35. Heat-resistant block; 36. Primary filter; 37. Support plate; 38. Secondary filter; 39. Fixing pin; 40. Return spring. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0034] Example 1

[0035] See also Figure 1 - Figure 7, a slow-release selenium fertilizer production device that is beneficial to crop absorption, comprising a tank body 1, a stirring rod 4, an atomizing one-way nozzle 6, a rotary joint 7 and a liquid storage tank 14, a top cover 2 is installed on the upper end of the tank body 1, a stirring rod 3 is installed on the middle part of the upper end of the top cover 2 through a sealed bearing, a plurality of stirring rods 4 are installed on both sides of the stirring rod 4, each stirring rod 4 is provided with a cavity connected to the dual-purpose cavity 5 inside the stirring rod 3, and each stirring rod 4 is provided with an atomizing one-way nozzle 6 for spraying a coating agent and conveying hot air at the upper and lower ends, the top of the stirring rod 3 is connected to a tee pipe 8 through a rotary joint 7, the air inlet end of the tee pipe 8 is connected to an air inlet valve 9, and the other end of the air inlet valve 9 is connected to a heat-resistant air supply pipe 10;

[0036] The liquid inlet end of the three-way pipe 8 is connected to the liquid inlet valve 11, and the other end of the liquid inlet valve 11 is connected to the liquid discharge end of the feed pump 13 through the liquid delivery pipe 12. The negative pressure end of the feed pump 13 is connected to the liquid storage tank 14 for holding the coating agent through the negative pressure pipe:

[0037] The upper end of the top cover 2 is provided with a plurality of feeding holes 16 for docking with the first electromagnetic discharge valve 15. The first electromagnetic discharge valve 15 is fixed in a batching tank 17 for storing slow-release selenium fertilizer particles. Brackets are fixed at the four corners of the bottom of the tank body 1. A second electromagnetic discharge valve 18 is installed at the bottom of the tank body 1. A controller 19 is installed on the outside of the tank body 1. A speaker 20 is installed on the front side of the controller 19. A time control panel 21 is provided on the side end of the controller 19. Considering that the current coating method of slow-release fertilizer adopts the water spraying method, it will cause the fertilizer to dissolve, resulting in the loss of fertilizer, which is not conducive to the absorption of crops, the present invention uses a stirring rod 4, an atomizing one-way nozzle 6, a liquid storage tank 14, a drying box 30 and a controller The controllers 19 cooperate with each other to coat the selenium fertilizer particles placed inside the tank body 1 while avoiding the problem of selenium fertilizer dissolution caused by spraying in the prior art, that is, the time for delivering the coating agent to the liquid storage tank 14, the feed pump 13 and the atomizing one-way nozzle 6 is input through the controlled timing panel 21. After reaching the threshold, the feed pump 13 stops working, and then the fan 33 and the electric heating network 32 in the drying box 30 heat the air and deliver it to the dual-purpose cavity 5 inside the stirring rod 3 and deliver hot air through the atomizing one-way nozzle 6. In addition, during the hot air delivery process, the stirring rod 4 will also be used to turn the selenium fertilizer particles to ensure the hot air drying effect, thereby avoiding the situation where the humidity inside the tank body 1 is too high and the selenium fertilizer particles are dissolved.

[0038] Please refer to Figure 1 and Figure 5As shown, a transmission gear 22 is fixed to the outside of the top end of the stirring rod 4, and one side of the transmission gear 22 is meshed with the drive gear 23, and the drive gear 23 is fixedly sleeved on the outside of the output shaft of the reduction motor 24. The reduction motor 24 is fixed to the top cover 2 through an L-shaped bracket 25, and a dust cover 26 is fixed to the side end of the L-shaped bracket 25, and the dust cover 26 is arranged on the outside of the drive gear 23 and the transmission gear 22. A clearance hole is provided in the middle of the dust cover 26 for placing the stirring rod 4 and the output of the reduction motor 24. By arranging the reduction motor 24, the drive gear 23, the transmission gear 22, the stirring rod 3 and the stirring rod 4, the selenium fertilizer particles inside the tank body 1 are turned over, thereby helping the drying and coating agent processing.

[0039] Please refer to Figure 1 and Figure 3 As shown, the liquid storage tank 14 is fixed to one side of the tank body 1 by a support block, and a refill valve 27 is connected to one side of the liquid storage tank 14 through a pipeline, and the other end of the refill valve 27 is used to connect to an external pipe. By setting the refill valve 27, the selenium fertilizer particle coating agent inside the liquid storage tank 14 is supplemented, that is, the pipeline storing the coating agent is connected to the refill valve 27 at a later stage, and the refill valve 27 can be opened when replenishment is needed.

[0040] Please refer to Figure 1 、 Figure 4 and Figure 5 As shown, the upper end of the top cover 2 is also provided with an embedded hole for installing a pressure relief valve 28 and an infrared temperature sensor 29. The pressure relief valve 28 is provided to relieve the air pressure inside the tank body 1. That is, when the air pressure inside the tank body 1 is too high due to water evaporation, the pressure will be discharged through the pressure relief valve 28. The presence of the infrared temperature sensor 29 plays a role in monitoring the internal temperature of the tank body 1.

[0041] Please refer to Figure 1 and Figure 2 As shown, the bottom of the heat-resistant air supply pipe 10 is connected to the interior of the drying box 30 and the air collecting hood 31. The drying box 30 is fixed to the other side of the tank body 1 by screws, and the interior of the drying box 30 is respectively provided with an inner cavity for placing the power heating network 32, the fan 33 and the filter plate 34. The air supply end of the fan 33 passes through the air supply pipe to the inner cavity for placing the electric heating network 32. The electric heating network 32 is fixed to the side wall of the inner cavity by a heat-resistant block 35. By setting the electric heating network 32 and the fan 33, the outside air is heated and transported to the inside of the tank body 1.

[0042] Please refer to Figure 1 and Figure 2As shown, the negative pressure end of the fan 33 is located above the primary filter 36, and the primary filter 36 is installed above the inner cavity for placing the filter plate 34, and a support plate 37 is hinged below the inner cavity for placing the filter plate 34. A through groove for installing the secondary filter 38 is opened in the middle of the support plate 37. By arranging the filter plate 34, the primary filter 36 and the secondary filter 38, the air entering the drying box 30 is filtered.

[0043] Please refer to Figure 1 and Figure 7 As shown, a mounting cavity for installing a fixing pin 39 is provided on one side of the bottom of the drying box 30, and a return spring 40 is provided between the fixing pin 39 and the mounting cavity, and the pin head of the fixing pin 39 is used to contact the fixing hole on the side of the support plate 37. The fixing pin 39 is provided in conjunction with the return spring 40 to fix the support plate 37. The above structure facilitates the user to regularly replace the filter plate 34.

[0044] Example 2

[0045] The present invention provides a method for preparing a slow-release and controlled-release selenium fertilizer production device that is beneficial to crop absorption, comprising the following steps:

[0046] S1. Check whether the selenium fertilizer particles to be coated and the coating agent are sufficient;

[0047] S2. Start the switch of the first electromagnetic discharge valve 15, and the selenium fertilizer particles in the batching tank 17 enter the interior of the tank body 1. At this time, the clinker pump is used to pump the coating agent in the liquid storage tank 14 to the dual-purpose chamber 5 inside the stirring rod 3 and spray the atomized coating agent onto the outside of the selenium fertilizer particles through the atomizing one-way nozzle 6. In this process, the reduction motor 24 is used to drive the stirring rods 4 on both sides of the stirring rod 3 to flip the selenium fertilizer particles and thus help the selenium fertilizer particles to flip and contact with the atomized coating agent. In this process, the time control panel 21 of the controller 19 is used to input the spraying time of the coating agent;

[0048] S3, after the spraying time reaches a preset threshold, the spraying is stopped to prevent the selenium fertilizer particles from being washed away by the liquid. At this time, the liquid inlet valve 11 is closed, the air inlet valve 9 is opened, and the fan 33 works to transport the outside air into the inner cavity where the electric heating net 32 ​​is placed. After the air is heated, it forms hot air that enters the dual-purpose cavity 5 of the stirring rod 3 and then transports the hot air through the atomizing one-way nozzle 6 to dry the film coated on the outside of the selenium fertilizer particles;

[0049] S4. To ensure the coating effect of the selenium fertilizer particles, steps S2 and S3 may be repeated to coat the selenium fertilizer particles for a second time. After the processing is completed, the coated selenium fertilizer particles are discharged through the second electromagnetic discharge valve 18.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for producing a slow-release selenium fertilizer that is beneficial to crop absorption, comprising a tank (1), a stirring rod (4), an atomizing one-way nozzle (6), a rotary joint (7) and a liquid storage tank (14), characterized in that: A top cover (2) is installed at the upper end of the tank body (1), and a stirring rod (3) is installed at the middle of the upper end of the top cover (2) through a sealed bearing. A plurality of stirring rods (4) are installed on both sides of the stirring rod (4), and each stirring rod (4) is provided with a cavity connected to the dual-purpose cavity (5) inside the stirring rod (3). The upper and lower ends of each stirring rod (4) are provided with an atomizing one-way nozzle (6) for spraying the coating agent and conveying hot air. The top of the stirring rod (3) is connected to a three-way pipe (8) through a rotary joint (7), and the air inlet end of the three-way pipe (8) is connected to an air inlet valve (9), and the other end of the air inlet valve (9) is connected to a heat-resistant air supply pipe (10); The liquid inlet end of the three-way pipe (8) is connected to a liquid inlet valve (11), and the other end of the liquid inlet valve (11) is connected to the liquid discharge end of the feed pump (13) through a liquid delivery pipe (12). The negative pressure end of the feed pump (13) is passed through a negative pressure pipe to a liquid storage tank (14) for containing the coating agent. The upper end of the top cover (2) is provided with a plurality of feeding holes (16) in a ring shape for docking with a first electromagnetic discharge valve (15). The first electromagnetic discharge valve (15) is fixed in a batching tank (17) for storing slow-release selenium fertilizer particles. Brackets are fixed at the four corners of the bottom of the tank body (1). A second electromagnetic discharge valve (18) is installed at the bottom of the tank body (1). A controller (19) is installed on the outside of the tank body (1). A speaker (20) is installed on the front side of the controller (19). A time control panel (21) is provided on the side end of the controller (19).

2. The device for producing a slow-release selenium fertilizer that is beneficial to crop absorption according to claim 1, characterized in that: A transmission gear (22) is fixed to the outside of the top end of the stirring rod (4), one side of the transmission gear (22) is meshed with a driving gear (23), and the driving gear (23) is fixedly sleeved on the outside of the output shaft of the reduction motor (24). The reduction motor (24) is fixed to the top cover (2) through an L-shaped bracket (25). A dust cover (26) is fixed to the side end of the L-shaped bracket (25), and the dust cover (26) is arranged on the outside of the driving gear (23) and the transmission gear (22). A clearance hole for placing the stirring rod (4) and the output of the reduction motor (24) is opened in the middle of the dust cover (26).

3. The device for producing a slow-release selenium fertilizer that is beneficial to crop absorption according to claim 1, characterized in that: The liquid storage tank (14) is fixed to one side of the tank body (1) via a support block. A liquid replenishing valve (27) is connected to one side of the liquid storage tank (14) via a pipeline, and the other end of the liquid replenishing valve (27) is used to connect to an external pipe.

4. The device for producing a slow-release selenium fertilizer that is beneficial to crop absorption according to claim 1, characterized in that: The upper end of the top cover (2) is also provided with an embedding hole for installing a pressure relief valve (28) and an infrared temperature sensor (29).

5. The device for producing a slow-release selenium fertilizer that is beneficial to crop absorption according to claim 1, characterized in that: The bottom of the heat-resistant air supply pipe (10) is connected to the interior of the drying box (30) and the air collecting cover (31). The drying box (30) is fixed to the other side of the tank body (1) by screws, and the interior of the drying box (30) is respectively provided with an inner cavity for placing the power supply heating network (32), the fan (33) and the filter plate (34). The air supply end of the fan (33) passes through the air supply pipe to the inner cavity for placing the electric heating network (32), and the electric heating network (32) is fixed to the side wall of the inner cavity by a heat-resistant block (35).

6. The device for producing a slow-release selenium fertilizer that is beneficial to crop absorption according to claim 5, characterized in that: The negative pressure end of the fan (33) is located above the primary filter (36), the primary filter (36) is installed above the inner cavity for placing the filter plate (34), and a support plate (37) is hinged below the inner cavity for placing the filter plate (34), and a through groove for installing the secondary filter (38) is opened in the middle of the support plate (37).

7. The device for producing a slow-release selenium fertilizer that is beneficial to crop absorption according to claim 5, characterized in that: A mounting cavity for mounting a fixing pin (39) is provided on one side of the bottom of the drying box (30), a return spring (40) is provided between the fixing pin (39) and the mounting cavity, and the pin head of the fixing pin (39) is used to abut against the fixing hole on the side of the support plate (37).

8. A method for preparing a slow-release selenium fertilizer that is beneficial to crop absorption using the device for producing selenium fertilizer according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Check whether the selenium fertilizer particles to be coated and the coating agent are sufficient; S2. Start the switch of the first electromagnetic discharge valve (15), and the selenium fertilizer particles in the batching tank (17) enter the interior of the tank body (1). At this time, the clinker pump is used to pump the coating agent in the liquid storage tank (14) to the dual-purpose chamber (5) inside the stirring rod (3) and spray the atomized coating agent to the outside of the selenium fertilizer particles through the atomizing one-way nozzle (6). In this process, the reduction motor (24) is used to drive the stirring rods (4) on both sides of the stirring rod (3) to turn the selenium fertilizer particles and help the selenium fertilizer particles turn and contact with the atomized coating agent. In this process, the time control panel (21) of the controller (19) is used to input the spraying time of the coating agent. S3, after the spraying time reaches a preset threshold, the spraying is stopped to prevent the selenium fertilizer particles from being washed away by the liquid. At this time, the liquid inlet valve (11) is closed, and the air inlet valve (9) is opened. At this time, the fan (33) works to transport the outside air into the inner cavity where the electric heating net (32) is placed. The air is heated to form hot air and enters the dual-purpose cavity (5) of the stirring rod (3). After that, the hot air is transported through the atomizing one-way nozzle (6) to dry the film coated on the outside of the selenium fertilizer particles; S4. In order to ensure the coating effect of the selenium fertilizer particles, the steps S2 and S3 can be repeated to coat the selenium fertilizer particles for the second time. After the processing is completed, the coated selenium fertilizer particles are discharged through the second electromagnetic discharge valve (18).

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