Preparation method of organic selenium fertilizer based on soil healthy cultivation

Abstract

The invention provides a preparation method of an organic selenium fertilizer based on soil healthy cultivation. The preparation method of the organic selenium fertilizer based on soil healthy cultivation comprises the following steps: S1, pretreating and activating raw materials; s2, an accurate mixing process; s3, carrying out superfine grinding and homogenization; s4, multi-dosage form processing; s5, quality index detection; s6, verifying the bio-availability; and S7, packaging and storage management. The preparation method of the organic selenium fertilizer based on soil healthy cultivation has the advantages of high selenomethionine activity, small heavy metal pollution risk, and high safety, stability and bioavailability of the fertilizer.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, and in particular to a method for preparing an organic selenium fertilizer based on soil health cultivation. Background Art

[0002] At present, selenium has been recognized as one of the essential trace elements for the human body. Its basic functions are anti-oxidation, scavenging free radicals, and participating in metabolism. It plays a very important and unique role in improving immunity, antagonizing toxins, delaying aging, promoting growth and development, and helping to prevent a variety of human diseases. Studies have shown that the liver, as a central organ of energy metabolism, is closely related to the normal function and occurrence of diseases with selenium. Selenium exerts its biological functions through the catalysis of selenoproteinases in the liver, and is closely related to chronic hepatitis, liver fibrosis, non-alcoholic fatty liver disease, and hepatocellular carcinoma; studies have shown that selenium can prevent or improve diabetes. Diabetes has become one of the major chronic non-communicable diseases that seriously threaten the health of Chinese residents. Diabetes and its complications not only seriously affect the quality of life of patients, but also impose a heavy economic burden on patients' families and society; a large number of animal experimental data, epidemiological data, and intervention trials have shown that selenium compounds have a clear role in preventing specific cancers and anti-tumor effects in the initial stage of cancer.

[0003] In order to achieve "soil selenium-agricultural product selenium-human selenium" and realize the ultimate goal of human selenium supplementation, traditional organic selenium fertilizers often face problems such as uneven raw material mixing, serious loss of selenomethionine activity, and high risk of heavy metal pollution during the preparation process.

[0004] Therefore, it is necessary to provide a new method for preparing organic selenium fertilizer based on soil health cultivation to solve the above technical problems. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a method for preparing an organic selenium fertilizer based on soil health cultivation, which has high selenomethionine activity, low heavy metal pollution risk, and high fertilizer safety, stability and biological effectiveness.

[0006] In order to solve the above technical problems, the method for preparing organic selenium fertilizer based on soil health cultivation provided by the present invention comprises the following steps: S1: Raw material pretreatment and activation: Select selenomethionine powder with a purity of ≥98% and potassium humate with a humic acid content of ≥30%; S2: Precision Mixing Process: Weigh selenomethionine and potassium humate in a mass ratio of 2:8, put them into a three-dimensional motion mixer and mix them evenly; S3: Ultrafine grinding and homogenization: The mixed material was transferred to a jet mill, the air flow pressure was controlled at 0.8 MPa, and the mixture was crushed to a particle size of ≤50 μm; S4: Multi-dose processing: One of granular fertilizer, powder fertilizer and liquid fertilizer is prepared according to the demand; S5: Quality index detection: The selenomethionine content was tested by high performance liquid chromatography, the humic acid activity was determined by Kjeldahl nitrogen determination, and the heavy metals were tested by atomic absorption spectrometry to ensure compliance with NY1429-2010 standards; S6: Bioavailability Verification: The plant absorption rate of organic selenium was verified through hydroponic experiments: the fertilizer was diluted 100 times and sprayed on rice seedlings. The selenium content in the leaves was measured after 7 days and compared with the sodium selenite control group to verify its safety and conversion efficiency; S7: Packaging and storage management: Granular fertilizers are packaged in double-layer woven bags, powders are vacuum-sealed in aluminum foil bags, and liquid fertilizers are packed in dark HDPE barrels. All finished products are stored in warehouses with a humidity of ≤60% and a temperature of ≤25°C to avoid mixing with oxidants. The shelf life is set at 18 months.

[0007] Preferably, in S1, the potassium humate is dried in an oven at 50° C. for 2 hours and crushed through an 80-mesh sieve to enhance its adsorption and mixing uniformity.

[0008] Preferably, in S2, the three-dimensional motion mixer is set to a speed of 25 rpm, the mixing time is 45 minutes, and the mixing process is divided into three times of adding materials, each time with an interval of 10 minutes to ensure that there is no stratification or agglomeration, and the final mixing uniformity is ≥98%.

[0009] Preferably, in S3, after crushing, an ultrasonic homogenizer with a frequency of 40 kHz is used for treatment for 30 minutes to further destroy the agglomerated particles and improve the solubility of the fertilizer and the absorption efficiency of crops.

[0010] Preferably, in S4, granular fertilizer: the mixture is mixed with kaolin in a ratio of 8:2, formed into particles with a diameter of 2-4 mm by a disc granulator, and dried by hot air at 50°C to a moisture content of ≤3%; powder fertilizer: the mixture after ultrafine grinding is directly packaged and vacuum packaged in an aluminum foil bag to prevent moisture absorption and agglomeration; liquid fertilizer: the mixture is dissolved in deionized water in a ratio of 1:5, stirred for 3 hours to form a homogeneous suspension, and then filtered through a 200-mesh filter and packaged; Preferably, in S, the air flow pulverizer includes a base plate, an air flow pulverizing box is fixedly installed on the top of the base plate, one side of the air flow pulverizing box is provided with a feeding mechanism fixedly installed on the top of the base plate, an air flow mechanism is fixedly installed on the outside of the air flow pulverizing box, the air flow mechanism includes an annular air inlet pipe and a plurality of nozzles, and the plurality of nozzles are installed in a ring shape on the annular air inlet pipe, a screening mechanism is installed on the top of the air flow pulverizing box, a collecting mechanism is fixedly installed on the top of the base plate, and the screening mechanism is connected to the collecting mechanism.

[0011] Preferably, the air flow pulverizing box includes a pulverizing box body fixedly mounted on a bottom plate, an inclined hole is provided on one side of the pulverizing box body, a plurality of mounting holes distributed in a ring shape are provided on the pulverizing box body, the nozzle passes through the mounting hole and is fixedly connected to the inner wall of the mounting hole, a slag discharge pipe is provided at the bottom of the pulverizing box, and a first valve is fixedly mounted on the slag discharge pipe.

[0012] Preferably, the feeding mechanism includes a support frame fixedly mounted on the base plate, a feed pipe is fixedly mounted on the top of the support frame, a feed hopper is provided on the top of the feed pipe, a rotating shaft is rotatably mounted in the feed pipe, a spiral feed piece is fixedly mounted on the outer side of the rotating shaft, the spiral feed piece is in contact with the inner wall of the feed pipe, a first motor is fixedly mounted on one side of the feed pipe, an output shaft of the first motor is fixedly connected to one end of the rotating shaft, and an inclined connecting pipe is fixedly mounted on the bottom end of the feed pipe.

[0013] Preferably, the screening mechanism includes a screening tube, one end of which extends into the crushing box, a plurality of mounting rings are fixedly mounted on the screening tube, the mounting rings are located in the crushing box, a plurality of screening cages are rotatably mounted in the mounting rings, the screening cages are rotatably connected to the crushing box, a plurality of second motors are fixedly mounted on the outer wall of the crushing box, and the output shafts of the second motors are fixedly connected to the screening cages.

[0014] Preferably, the collecting mechanism includes a collecting box fixedly mounted on the base plate, the other end of the screening tube extends into the collecting box, a second valve is mounted on the bottom of the collecting box, an air outlet pipe is fixedly mounted on the top of the collecting box, a filter bag is provided on the outer fixed sleeve of the air outlet pipe, a dust box is provided on the outer fixed sleeve of the filter bag, connecting holes are provided on the inner walls on both sides of the dust box, an inclined tube is provided on the outer wall of the dust box, one end of the inclined tube is connected to the corresponding connecting hole, and a filter screen is fixedly mounted on the other end of the inclined tube.

[0015] Compared with the related art, the method for preparing organic selenium fertilizer based on soil health cultivation provided by the present invention has the following beneficial effects: The present invention provides a method for preparing organic selenium fertilizer based on soil health cultivation, wherein the outer frame and the inner frame are fixedly connected via the guide shaft, one end of the torsion spring is fixed to the guide shaft, and the other end of the torsion spring is fixed to the fixing sleeve, and after the lock is opened, the inner frame automatically pops up under the elastic force of the torsion spring, so that the operation is more convenient, the windowsill space is reasonably utilized, indoor ventilation and heat dissipation are convenient, and dust accumulated between the inner frame and the outer frame is cleaned conveniently, the inner frame is perpendicular to the outer frame after opening, does not affect the light, and can effectively prevent rainwater from entering the room from the windowsill on rainy days, thereby improving the waterproof performance of the windowsill, the supporting structure is connected between the inner frame and the outer frame, and the inner frame, the outer frame and the supporting structure form a spatial triangle structure, thereby improving the stability of the inner frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart of a method for preparing an organic selenium fertilizer based on soil health cultivation provided by the present invention; Figure 2 A schematic diagram of the structure of a jet mill in the method for preparing organic selenium fertilizer based on soil health cultivation provided by the present invention; Figure 3 for Figure 2 A schematic diagram of the structure from another perspective is shown; Figure 4 for Figure 2 The cross-sectional structural diagram shown; Figure 5 for Figure 2 The structural schematic diagram of the feeding mechanism shown; Figure 6 for Figure 5 The cross-sectional structural diagram shown; Figure 7 for Figure 2 A schematic diagram of the connection structure of the airflow mechanism and the screening mechanism shown; Figure 8 for Figure 7 The cross-sectional structural diagram shown; Fig. 9 for Figure 2 The structural schematic diagram of the airflow mechanism shown; Fig.10 for Figure 2 The structural schematic diagram of the screening mechanism shown; Fig.11 for Fig.10 The cross-sectional structural diagram shown; Fig.12 for Fig.11 The schematic diagram of the connection structure between the collecting mechanism and the screening mechanism shown; Fig.13 for Fig.12 The cross-sectional structural diagram is shown.

[0017] Numbers in the figure: 1, bottom plate, 2, air flow crushing box, 201, crushing box body, 202, inclined hole, 203, mounting hole, 204, slag discharge pipe, 205, first valve, 3, feeding mechanism, 301, support frame, 302, feeding pipe, 303, feeding hopper, 304, rotating shaft, 305, spiral feeding piece, 306, first motor, 307, connecting pipe, 4, air flow mechanism, 401, annular air inlet pipe, 402, nozzle, 5, screening mechanism, 501, screening pipe, 502, mounting ring, 503, screening cage, 504, second motor, 6, collecting mechanism, 601, collecting box, 602, second valve, 603, air outlet pipe, 604, filter bag, 605, dustproof box, 606, connecting hole, 607, inclined pipe, 608, filter net. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0019] Please refer to Figure 1-Figure 13 ,in, Figure 1 A flow chart of a method for preparing an organic selenium fertilizer based on soil health cultivation provided by the present invention; Figure 2 A schematic diagram of the structure of a jet mill in the method for preparing organic selenium fertilizer based on soil health cultivation provided by the present invention; Figure 3 for Figure 2 A schematic diagram of the structure from another perspective is shown; Figure 4 for Figure 2 The cross-sectional structural diagram shown; Figure 5 for Figure 2 The structural schematic diagram of the feeding mechanism shown; Figure 6 for Figure 5 The cross-sectional structural diagram shown; Figure 7 for Figure 2 A schematic diagram of the connection structure of the airflow mechanism and the screening mechanism shown; Figure 8 for Figure 7 The cross-sectional structural diagram shown; Fig. 9 for Figure 2 The structural schematic diagram of the airflow mechanism shown; Fig.10 for Figure 2 The structural schematic diagram of the screening mechanism shown; Fig.11 for Fig.10 The cross-sectional structural diagram shown; Fig.12 for Fig.11 The schematic diagram of the connection structure between the collecting mechanism and the screening mechanism shown; Fig.13 for Fig.12The cross-sectional structure schematic diagram shown. The method for preparing organic selenium fertilizer based on soil health cultivation includes the following steps: S1: Raw material pretreatment and activation: Select selenomethionine powder with a purity of ≥98% and potassium humate with a humic acid content of ≥30%. Potassium humate needs to be dried in a 50°C oven for 2 hours and crushed through an 80-mesh sieve to enhance its adsorption and mixing uniformity.

[0020] S2: Precision Mixing Process: Weigh selenomethionine and potassium humate in a mass ratio of 2:8, put them into a three-dimensional motion mixer, set the speed to 25rpm, and mix for 45 minutes. The mixing process is divided into three times, with an interval of 10 minutes each time, to ensure that there is no stratification or agglomeration, and the final mixing uniformity is ≥98%.

[0021] S3: Ultrafine grinding and homogenization: The mixed material was transferred to the air flow mill, and the air flow pressure was controlled at 0.8 MPa, and the material was crushed to a particle size of ≤50 μm. After crushing, the material was treated with an ultrasonic homogenizer for 30 minutes (frequency 40 kHz) to further destroy the agglomerated particles and improve the solubility of the fertilizer and the absorption efficiency of crops.

[0022] S4: Multi-dose processing: 1) Granular fertilizer: Mix the mixture with kaolin in a ratio of 8:2, and make it into granules with a diameter of 2~4mm through a disc granulator (speed 30rpm), and dry it with hot air at 50℃ to a moisture content of ≤3%.

[0023] 2) Powder fertilizer: directly package the ultrafinely crushed mixture and use aluminum foil bags for vacuum packaging to prevent moisture absorption and agglomeration.

[0024] 3) Liquid fertilizer: Dissolve the mixture in deionized water at a ratio of 1:5, stir for 3 hours (500rpm) to form a homogeneous suspension, filter through a 200-mesh filter and package.

[0025] S5: Quality index detection: High performance liquid chromatography (HPLC) was used to detect the selenomethionine content (≥10%), the Kjeldahl method was used to determine the humic acid activity (≥25%), and atomic absorption spectrometry was used to detect heavy metals (lead ≤5mg / kg, arsenic ≤2mg / kg) to ensure compliance with the NY1429-2010 standard.

[0026] S6: Bioavailability Verification: The plant absorption rate of organic selenium was verified through hydroponic experiments: the fertilizer was diluted 100 times and sprayed on rice seedlings. The selenium content in the leaves was measured after 7 days (needed to be ≥50μg / g) and compared with the sodium selenite control group to verify its safety and conversion efficiency.

[0027] S7: Packaging and storage management: Granular fertilizers are packaged in double-layer woven bags (lined with moisture-proof film), powders are vacuum-sealed in aluminum foil bags, and liquid fertilizers are packed in dark HDPE barrels. All finished products are stored in warehouses with a humidity of ≤60% and a temperature of ≤25°C to avoid mixing with oxidants. The shelf life is set at 18 months.

[0028] The present invention also provides an air flow pulverizer, comprising a base plate 1, an air flow pulverizing box 2 is fixedly installed on the top of the base plate 1, a feeding mechanism 3 fixedly installed on the top of the base plate 1 is provided on one side of the air flow pulverizing box 2, an air flow mechanism 4 is fixedly installed on the outside of the air flow pulverizing box 2, the air flow mechanism 4 comprises an annular air inlet pipe 401 and a plurality of nozzles 402, the annular air inlet pipe 401 is externally connected to a high-pressure air pipe, the air flow pressure of the nozzle 402 is 0.8 MPa, and the plurality of nozzles 402 are installed in a ring shape on the annular air inlet pipe 401, a screening mechanism 5 is installed on the top of the air flow pulverizing box 2, a collecting mechanism 6 is fixedly installed on the top of the base plate 1, and the screening mechanism 5 is connected to the collecting mechanism 6.

[0029] The air flow pulverizing box 2 includes a pulverizing box body 201 fixedly mounted on a bottom plate 1, an inclined hole 202 is provided on one side of the pulverizing box body 201, a plurality of mounting holes 203 distributed in a ring shape are provided on the pulverizing box body 201, the nozzle 402 passes through the mounting hole 203 and is fixedly connected to the inner wall of the mounting hole 203, the airflows ejected from the plurality of nozzles 402 converge at the center of the pulverizing box body 201, and a slag discharge pipe 204 is provided at the bottom of the pulverizing box 201, a first valve 205 is fixedly mounted on the slag discharge pipe 204.

[0030] The feeding mechanism 3 includes a support frame 301 fixedly mounted on the base plate 1, a feeding pipe 302 is fixedly mounted on the top of the support frame 301, a feeding hopper 303 is provided on the top of the feeding pipe 302, a rotating shaft 304 is rotatably mounted in the feeding pipe 302, a spiral feeding piece 305 is fixedly mounted on the outer side of the rotating shaft 304, the spiral feeding piece 305 is in contact with the inner wall of the feeding pipe 302, a first motor 306 is fixedly mounted on one side of the feeding pipe 302, an output shaft of the first motor 306 is fixedly connected to one end of the rotating shaft 304, a connecting pipe 307 is fixedly mounted at an inclined position at the bottom end of the feeding pipe 302, and the material entering through the connecting pipe 307 just falls into the confluence of the airflows sprayed from the multiple nozzles 402.

[0031] The screening mechanism 5 includes a screening tube 501, one end of which extends into the crushing box 201, and a plurality of mounting rings 502 are fixedly mounted on the screening tube 501, and the mounting ring 502 is located in the crushing box 201. A plurality of screening cages 503 are rotatably mounted in the mounting ring 502, and the screening cages 503 are rotatably connected to the crushing box 201. A plurality of second motors 504 are fixedly mounted on the outer wall of the crushing box 201, and the output shafts of the second motors 504 are fixedly connected to the screening cages 503.

[0032] The collecting mechanism 6 includes a collecting box 601 fixedly mounted on the bottom plate 1, the other end of the screening pipe 501 extends into the collecting box 601, a second valve 602 is mounted at the bottom of the collecting box 601, an air outlet pipe 603 is fixedly mounted on the top of the collecting box 601, a filter bag 604 is fixedly mounted on the outer side of the air outlet pipe 603, a dust box 605 is fixedly mounted on the outer side of the filter bag 604, connecting holes 606 are provided on the inner walls on both sides of the dust box 605, an oblique tube 607 is provided on the outer wall of the dust box 605, one end of the oblique tube 607 is connected to the corresponding connecting hole 606, and a filter screen 608 is fixedly mounted on the other end of the oblique tube 607 When the mixed material is subjected to ultrafine grinding and pulverizing, the mixed material first enters through the feed hopper 303, and the mixed material entering is driven by the spiral feed piece 305 through the rotating shaft 304 by the first motor 306 to transport the mixed material to the connecting pipe 307 and fall into the grinding box 201, and the mixed material falling into the grinding box 201 is ground by the high-pressure airflow sprayed through the nozzle 402, and the airflow sprayed from the nozzle forms an air duct in the grinding box 201, the screening tube 501, the collecting box 601, the dustproof box 605 and the inclined tube 607, and the airflow lifts up the smaller mixed flow, and the mixed material that meets the requirements enters the collecting box 601 through the screening cage 503 and the screening tube 501, and is blocked in the collecting mechanism 6 by the filter bag 604 and the filter net 608 in the collecting mechanism 6, thereby completing the collection of the material.

[0033] Compared with the related art, the method for preparing organic selenium fertilizer based on soil health cultivation provided by the present invention has the following beneficial effects: The present invention provides a method for preparing organic selenium fertilizer based on soil health cultivation. In the raw material pretreatment stage, 50°C drying and 80-mesh sieve crushing process are adopted to activate the adsorption function of potassium humate. Combined with the three-dimensional motion mixer, the material is added in batches to completely solve the stratification problem and ensure the accurate ratio of selenomethionine and potassium humate. Secondly, ultrafine grinding and ultrasonic homogenization work together to destroy particle agglomeration, increase the solubility of fertilizer by more than 40%, and the crop absorption rate can reach ≥50 μg / g after verification by hydroponic test. Multi-dosage form processing meets different agricultural needs: granular fertilizer is enhanced with sustained release through kaolin granulation; powder is vacuum packaged for moisture-proof; liquid suspension is suitable for foliar spraying to achieve "one fertilizer for multiple uses". In terms of quality control, high performance liquid chromatography is used to accurately detect the content of selenomethionine, Kjeldahl nitrogen determination method is used to determine the activity of humic acid, and atomic absorption spectrometry is used to strictly control heavy metals, which fully complies with the NY 1429-2010 standard and eliminates pollution risks from the source. In terms of storage management, through double-layer moisture-proof woven bags, aluminum foil vacuum sealing and light-proof HDPE barrel packaging, combined with temperature and humidity control, the shelf life is extended to 18 months, and the stability is three times higher than that of traditional products. Field tests have shown that this fertilizer can increase the selenium content of rice to 438 μg / kg without heavy metal accumulation, providing an efficient, safe and sustainable solution for soil health cultivation and functional agriculture.

[0034] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing organic selenium fertilizer based on soil health cultivation, characterized in that: The following steps are involved: S1: Raw material pretreatment and activation: Select selenomethionine powder with a purity of ≥98% and potassium humate with a humic acid content of ≥30%; S2: Precision Mixing Process: Weigh selenomethionine and potassium humate in a mass ratio of 2:8, put them into a three-dimensional motion mixer and mix them evenly; S3: Ultrafine grinding and homogenization: The mixed material was transferred to a jet mill, the air flow pressure was controlled at 0.8 MPa, and the mixture was crushed to a particle size of ≤50 μm; S4: Multi-dose processing: One of granular fertilizer, powder fertilizer and liquid fertilizer is prepared according to the demand; S5: Quality index detection: The selenomethionine content was tested by high performance liquid chromatography, the humic acid activity was determined by Kjeldahl nitrogen determination, and the heavy metals were tested by atomic absorption spectrometry to ensure compliance with NY1429-2010 standards; S6: Bioavailability Verification: The plant absorption rate of organic selenium was verified through hydroponic experiments: the fertilizer was diluted 100 times and sprayed on rice seedlings. The selenium content in the leaves was measured after 7 days and compared with the sodium selenite control group to verify its safety and conversion efficiency; S7: Packaging and storage management: Granular fertilizers are packaged in double-layer woven bags, powders are vacuum-sealed in aluminum foil bags, and liquid fertilizers are packed in dark HDPE barrels. All finished products are stored in warehouses with a humidity of ≤60% and a temperature of ≤25°C to avoid mixing with oxidants. The shelf life is set at 18 months.

2. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 1, characterized in that: In S1, potassium humate is dried in an oven at 50° C. for 2 hours and crushed through an 80-mesh sieve to enhance its adsorption and mixing uniformity.

3. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 1, characterized in that: In S2, the three-dimensional motion mixer is set to a rotation speed of 25 rpm, the mixing time is 45 minutes, and the mixing process is divided into three times of adding materials, each time with an interval of 10 minutes to ensure that there is no stratification or agglomeration, and the final mixing uniformity is ≥98%.

4. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 1, characterized in that: In S3, after the crushing, an ultrasonic homogenizer with a frequency of 40 kHz is used for processing for 30 minutes to further destroy the agglomerated particles and improve the solubility of the fertilizer and the absorption efficiency of crops.

5. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 1, characterized in that: In S4, granular fertilizer: the mixture is mixed with kaolin in a ratio of 8:2, formed into particles with a diameter of 2-4 mm by a disc granulator, and dried with hot air at 50°C to a moisture content of ≤3%; powder fertilizer: the ultrafinely crushed mixture is directly packaged and vacuum-sealed in an aluminum foil bag to prevent moisture absorption and agglomeration; liquid fertilizer: the mixture is dissolved in deionized water in a ratio of 1:5, stirred for 3 hours to form a homogeneous suspension, and filtered through a 200-mesh filter before packaging.

6. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 1, characterized in that: In S3, the air flow pulverizer includes a base plate, an air flow pulverizing box is fixedly installed on the top of the base plate, a feeding mechanism fixedly installed on the top of the base plate is provided on one side of the air flow pulverizing box, an air flow mechanism is fixedly installed on the outer side of the air flow pulverizing box, the air flow mechanism includes an annular air inlet pipe and a plurality of nozzles, and the plurality of nozzles are installed in a ring shape on the annular air inlet pipe, a screening mechanism is installed on the top of the air flow pulverizing box, a collecting mechanism is fixedly installed on the top of the base plate, and the screening mechanism is connected to the collecting mechanism.

7. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 6, characterized in that: The air flow pulverizing box includes a pulverizing box body fixedly mounted on a bottom plate, an inclined hole is provided on one side of the pulverizing box body, a plurality of mounting holes distributed in a ring shape are provided on the pulverizing box body, the nozzle passes through the mounting hole and is fixedly connected to the inner wall of the mounting hole, a slag discharge pipe is provided at the bottom of the pulverizing box, and a first valve is fixedly mounted on the slag discharge pipe.

8. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 7, characterized in that: The feeding mechanism includes a support frame fixedly mounted on the base plate, a feeding pipe is fixedly mounted on the top of the support frame, a feeding hopper is provided on the top of the feeding pipe, a rotating shaft is rotatably mounted in the feeding pipe, a spiral feeding piece is fixedly mounted on the outer side of the rotating shaft, the spiral feeding piece is in contact with the inner wall of the feeding pipe, a first motor is fixedly mounted on one side of the feeding pipe, an output shaft of the first motor is fixedly connected to one end of the rotating shaft, and an inclined connecting pipe is fixedly mounted on the bottom end of the feeding pipe.

9. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 8, characterized in that: The screening mechanism includes a screening tube, one end of which extends into the crushing box, a plurality of mounting rings are fixedly mounted on the screening tube, the mounting rings are located in the crushing box, a plurality of screening cages are rotatably mounted in the mounting rings, the screening cages are rotatably connected to the crushing box, a plurality of second motors are fixedly mounted on the outer wall of the crushing box, and the output shafts of the second motors are fixedly connected to the screening cages.

10. The method for preparing organic selenium fertilizer based on soil health cultivation according to claim 9, characterized in that: The collecting mechanism includes a collecting box fixedly mounted on the bottom plate, the other end of the screening tube extends into the collecting box, a second valve is mounted on the bottom of the collecting box, an air outlet pipe is fixedly mounted on the top of the collecting box, a filter bag is fixedly mounted on the outer side of the air outlet pipe, a dust box is fixedly mounted on the outer side of the filter bag, connecting holes are formed on the inner walls on both sides of the dust box, an inclined tube is formed on the outer wall of the dust box, one end of the inclined tube is connected to the corresponding connecting hole, and a filter screen is fixedly mounted on the other end of the inclined tube.

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