Preparation method and equipment of selenium-rich water-soluble fertilizer for reducing heavy metal activity of acidified cultivated land

Abstract

The invention discloses a preparation method and equipment of a selenium-rich water-soluble fertilizer capable of reducing heavy metal activity of acidified cultivated land, and relates to the technical field of water-soluble fertilizer preparation, the preparation method comprises a preparation main body, the top of the preparation main body is fixedly connected with a cover plate, the top of the cover plate is provided with a sealing cover, and the center of an inner cavity of the cover plate is fixedly connected with a feeding bin; and one end of the top of the feeding bin is fixedly connected with a feeding pipe, and the outer wall of the feeding pipe is in sliding connection with an inner cavity of the sealing cover. According to the preparation device, a first gear rod drives a fluted disc to rotate an extension pipe, so that a turbine arranged at the bottom of one side of the outer wall of the extension pipe fully stirs an organic acid liquid and a selenium compound in a preparation main body, and the problem that a traditional preparation device for the activity-reducing selenium-rich water-soluble fertilizer is difficult to use in the use process is further solved. When the selenium compound is mixed with the organic acid liquid, the temperature rise and the generation of toxic gas are accompanied, so that the potential safety hazard is large, and the preparation efficiency of the mixture is influenced.

Description

Technical Field

[0001] This invention relates to the field of water-soluble fertilizer preparation technology, specifically to a method and equipment for preparing a selenium-enriched water-soluble fertilizer for deactivating heavy metals in acidified farmland. Background Technology

[0002] The development of selenium-enriched water-soluble fertilizer for reducing heavy metals in acidified farmland stems from the severe situation of farmland acidification and heavy metal pollution in my country. Targeting the hilly areas south of the Yangtze River in my country, where high temperatures and heavy rainfall lead to soil desilication and aluminum enrichment, with an acidification rate exceeding 40%, and a prominent risk of cadmium pollution, this product slowly releases selenium through pH-responsive carriers (such as chitosan-silica complexes) in acidic soils. Utilizing the antagonistic effect of selenium on heavy metals (such as nano-selenium competitively inhibiting cadmium absorption by roots), the cadmium content in rice is reduced by more than 45%, while simultaneously reducing the risks of arsenic, lead, etc., and preventing selenite from being fixed by iron and aluminum oxides, thereby increasing the selenium absorption rate of crops to over 50%.

[0003] The existing technology has the following problems:

[0004] 1. The existing equipment for preparing heavy metal deactivation and selenium-enriched water-soluble fertilizer for acidified farmland poses significant safety hazards during use. This is because the mixing of selenium compounds with organic acid liquids is accompanied by temperature rise and the generation of toxic gases, which also affects the preparation efficiency of the mixture.

[0005] 2. In the existing equipment for preparing heavy metal deactivation and selenium-enriched water-soluble fertilizer for acidified farmland, the inert gas is difficult to mix fully with selenium compounds and organic acid liquids, resulting in poor inhibition of toxic gases by the inert gas. Summary of the Invention

[0006] This invention provides a method and equipment for preparing a selenium-enriched water-soluble fertilizer for deactivating heavy metals in acidified farmland, in order to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing a selenium-enriched water-soluble fertilizer for deactivating heavy metals in acidified arable land, the method comprising the following steps:

[0009] S1: By cutting the leaves of Viola yedoensis and washing the roots of Viola yedoensis, the leaves are dried at a low temperature below 60 degrees Celsius. Finally, the dried Viola yedoensis is pulverized into a fine powder of 80-100 mesh to obtain selenium compounds.

[0010] S2: The organic acid liquid is fed into the preparation body through the feed pipe, and then the selenium compound is fed into the feed hopper through the feed pipe, so that the ratio of selenium compound to organic acid liquid is 1:1.5 to 2.5. At this time, the motor drives the turbine to stir the selenium compound and organic acid liquid, and obtain mixture A.

[0011] S3: The metal antagonist and the organic multidentate chelating agent are fed into the preparation body through the feed pipe in sequence according to the total proportion of mixture A of 3% to 5%. Then, the metal antagonist, the organic multidentate chelating agent and mixture A are fully mixed by using a turbine to obtain mixture B.

[0012] S4: A portion of mixture B is pumped from the pumping pipe into the first static mixing pipe. At this time, the electronic control valve is opened to allow the surfactant in the feeding bin to enter the first static mixing pipe. As mixture B is flushed, it is fully mixed. Then, it is discharged back into the preparation body through the drain pipe and stirred by a turbine to adjust the pH value of mixture B to 6.5 to 7.0.

[0013] A preparation device for a water-soluble fertilizer for deactivating heavy metals in acidified farmland and enriching selenium includes a preparation body. A cover plate is fixedly connected to the top of the preparation body, and a sealing cap is installed on the top of the cover plate. A feeding hopper is fixedly connected to the center of the inner cavity of the cover plate, and a feeding pipe is fixedly connected to one end of the top of the feeding hopper. The outer wall of the feeding pipe is slidably connected to the inner cavity of the sealing cap. An electric telescopic rod is fixedly connected to the center of the top of the inner wall of the feeding hopper, and a discharge column is fixedly connected to the output end of the electric telescopic rod. An air supply pipe is fixedly connected to one end of the inner cavity of the discharge column, and an elastic piston is slidably connected to the bottom of the air supply pipe. An exhaust pin is inserted into the top of the air supply pipe, and the outer wall of the exhaust pin is fixedly connected to one end of the inner cavity of the feeding hopper. An air pump is fixedly connected to one end of the exhaust pin, and an air inlet is fixedly connected to the input end of the air pump. One side of the outer wall of the air inlet is fixedly connected to the top of one side of the outer wall of the preparation body.

[0014] A further improvement of the technical solution of the present invention is that: a motor is fixedly connected to one end of the top of the inner wall of the cover plate, and a first gear rod is fixedly connected to the output end of the motor. The bottom of the first gear rod is rotatably connected to one end of the bottom of the inner wall of the cover plate. A gear plate meshes with one side of the outer wall of the first gear rod, and an extension tube is fixedly connected to the inner wall of the gear plate. The inner wall of the extension tube is rotatably connected to the outer wall of the feed hopper, and a turbine is fixedly connected to the bottom of one side of the outer wall of the extension tube.

[0015] A further improvement of the technical solution of the present invention is that: a second gear rod is rotatably connected to the bottom of the inner wall of the cover plate near the first gear rod, and one side of the outer wall of the second gear rod meshes with one side of the outer wall of the gear disc, a liquid distribution chamber is penetrating the top of one side of the outer wall of the second gear rod, and a condensing threaded tube is fixedly connected to the top of the second gear rod, while a temperature guiding column is rotatably connected to the inner wall of the condensing threaded tube.

[0016] A further improvement of the technical solution of the present invention is that: one side of the outer wall of the liquid separation chamber is fixedly connected to one side of the inner wall of the cover plate, and an air inlet pipe is fixedly connected to the top of the outer wall of the liquid separation chamber near the inner wall of the cover plate, and one end of the air inlet pipe is fixedly connected to the bottom of the inner cavity of the cover plate; an exhaust pipe is fixedly connected to the side of the outer wall of the liquid separation chamber away from the air inlet pipe, and a waste liquid pipe is fixedly connected to the bottom of the outer wall of the liquid separation chamber near the exhaust pipe.

[0017] A further improvement of the technical solution of the present invention is that: a feeding bin is fixedly connected to one end of the top of the cover plate, and an electric control valve is fixedly connected to the bottom of the feeding bin; a first static mixing pipe is fixedly connected to the output end of the electric control valve, and a liquid extraction pipe is fixedly connected to one end of the first static mixing pipe; the outer wall of the liquid extraction pipe is fixedly connected to the inner cavity of the cover plate; a liquid extraction pump is fixedly connected to the middle of the first static mixing pipe, and a second static mixing pipe is fixedly connected to the output end of the liquid extraction pump; a drain pipe is fixedly connected to one end of the second static mixing pipe, and the outer wall of the drain pipe is fixedly connected to the end of the inner cavity of the cover plate near the liquid extraction pipe.

[0018] A further improvement of the technical solution of the present invention is that: an electrode sensor is fixedly connected to the top of the cover plate between the feeding bin and the pump, and a detection column is fixedly connected to the output end of the electrode sensor, while the outer wall of the detection column is fixedly connected to the end of the cover plate cavity away from the pumping pipe.

[0019] A further improvement of the technical solution of the present invention is that: a circulation chamber is fixedly connected to one end of the outer wall of the preparation body near the air inlet chamber, and a liquid delivery pipe is fixedly connected to the output end of the circulation chamber; a circulation condenser pipe is fixedly connected to one end of the liquid delivery pipe, and one end of the circulation condenser pipe is fixedly connected to the input end of the circulation chamber.

[0020] A further improvement of the technical solution of the present invention is that: an electrically controlled lifting frame is fixedly connected to the center of the bottom of the preparation body, and a drainage arc block is fixedly connected to the bottom of one side of the inner wall of the electrically controlled lifting frame; a liquid blocking ring is fixedly connected to the output end of the electrically controlled lifting frame; and one side of the inner wall of the liquid blocking ring is slidably connected to the outer wall of the drainage arc block; and a drainage groove is opened in the inner cavity of the liquid blocking ring.

[0021] A further improvement of the technical solution of the present invention is that: a dividing chamber is fixedly connected to the bottom of the inner wall of the preparation body, and a number of baffles are fixedly connected to the inner wall of the dividing chamber.

[0022] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0023] 1. This invention provides a method and equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified farmland and enriching it with selenium. A first gear shaft drives a gear disc, causing an extension tube to rotate. This causes a turbine located at the bottom of one side of the extension tube to thoroughly stir the organic acid liquid and selenium compound within the preparation body, forming mixture A. Simultaneously, an electric telescopic rod moves the feed column upwards, repeating the above operation. This allows the selenium compound to intermittently carry inert gas bubbles into the preparation body, effectively slowing down the exothermic reaction between the selenium compound and the organic acid, and also helping to suppress the toxic gases produced after mixing. This further solves the problem that traditional equipment for preparing deactivating selenium-enriched water-soluble fertilizers poses significant safety hazards due to the temperature rise and toxic gas generation accompanying the mixing of selenium compounds and organic acid liquids, and also affects the preparation efficiency of the mixture.

[0024] 2. This invention provides a method and equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified farmland. By setting several baffles on the inner wall of the dividing chamber and cooperating with the traction force of the turbine, the mixture A is fully stirred and discharged along the bottom of the dividing chamber, and comes into contact with the selenium compound and inert gas bubbles that are discharged into the preparation body again, thereby forming a turbulent effect, so that the selenium compound, organic acid liquid and inert gas are mixed more fully. Furthermore, by setting an electrically controlled lifting frame at the center of the bottom of the preparation body, the problem of poor inhibition effect of inert gas on toxic gases due to the difficulty of the inert gas to fully mix with the selenium compound and organic acid liquid during the use of traditional deactivating selenium water-soluble fertilizer preparation devices is further solved. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the circulating chamber structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the cover plate structure of the present invention;

[0028] Figure 4 This is a side sectional view of the present invention;

[0029] Figure 5 This is a schematic diagram of the compartment structure of the present invention;

[0030] Figure 6 This is a side sectional view of the cover plate of the present invention;

[0031] Figure 7 This is a schematic diagram of the electrode sensor structure of the present invention;

[0032] Figure 8 This is a schematic diagram of the feeding hopper structure of the present invention;

[0033] Figure 9 This is a side sectional view of the drainage arc block of the present invention;

[0034] Figure 10 This is a schematic diagram of the liquid separation chamber structure of the present invention;

[0035] Figure 11 For the present invention Figure 8 Enlarged view of point A in the middle;

[0036] Figure 12 For the present invention Figure 8 Enlarged diagram of point B in the middle.

[0037] In the diagram: 1. Preparation body; 2. Cover plate; 3. Cap; 4. Feed hopper; 5. Feed pipe; 6. Electric telescopic rod; 7. Feed column; 8. Gas supply pipe; 9. Elastic piston; 10. Exhaust pin; 11. Air pump; 12. Air inlet chamber; 13. Motor; 14. First gear rod; 15. Gear disc; 16. Extension tube; 17. Turbine; 18. Second gear rod; 19. Liquid distribution chamber; 20. Condensation threaded pipe; 21. Temperature guiding column; 22. Air inlet pipe; 23. Exhaust pipe; 24. Waste liquid pipe; 25. Feeding bin; 26. Electrically controlled valve; 27. First static mixing pipe; 28. Liquid extraction pipe; 29. ​​Liquid extraction pump; 30. Second static mixing pipe; 31. Drain pipe; 32. Electrode sensor; 33. Detection column; 34. Circulation bin; 35. Liquid delivery pipe; 36. Circulating condenser pipe; 37. Electrically controlled lifting frame; 38. Drainage arc block; 39. Liquid blocking ring; 40. Drainage trough; 41. Dividing bin; 42. Baffle. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0039] like Figures 1 to 12 As shown in the embodiment of the present invention, a method for preparing a selenium-enriched water-soluble fertilizer for deactivating heavy metals in acidified arable land includes the following steps:

[0040] S1: By cutting the leaves of Viola yedoensis and washing the roots of Viola yedoensis, the leaves are dried at a low temperature below 60 degrees Celsius. Finally, the dried Viola yedoensis is pulverized into a fine powder of 80-100 mesh to obtain selenium compounds.

[0041] S2: By feeding the organic acid liquid into the preparation body 1 through the feed pipe 5, and then feeding the selenium compound into the feed hopper 4 through the feed pipe 5, the ratio of selenium compound to organic acid liquid is 1:1.5 to 2.5. At this time, the motor 13 drives the turbine 17 to stir the selenium compound and organic acid liquid, and obtain mixture A.

[0042] S3: The metal antagonist and the organic multidentate chelating agent are fed into the preparation body 1 through the feed pipe 5 in sequence according to the total proportion of mixture A of 3% to 5%. Then, the metal antagonist, the organic multidentate chelating agent and mixture A are fully mixed by the turbine 17 to obtain mixture B.

[0043] S4: A portion of mixture B is pumped from the pumping pipe 28 into the first static mixing pipe 27 by the pumping pump 29. At this time, the electric control valve 26 is opened to allow the surfactant in the feeding bin 25 to enter the first static mixing pipe 27. As the mixture B is flushed, it is fully mixed. Then, it is discharged back into the preparation body 1 through the drain pipe 31 and stirred by the turbine 17 to adjust the pH value of mixture B to 6.5 to 7.0.

[0044] The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified farmland includes a preparation body 1. A cover plate 2 is fixedly connected to the top of the preparation body 1, and a sealing cap 3 is installed on the top of the cover plate 2. A feeding hopper 4 is fixedly connected to the center of the inner cavity of the cover plate 2, and a feeding pipe 5 is fixedly connected to one end of the top of the feeding hopper 4. The outer wall of the feeding pipe 5 is slidably connected to the inner cavity of the sealing cap 3. An electric telescopic rod 6 is fixedly connected to the center of the top of the inner wall of the feeding hopper 4, and a discharge column 7 is fixedly connected to the output end of the electric telescopic rod 6. An air supply pipe 8 is fixedly connected to one end of the inner cavity of the discharge column 7, and an elastic piston 9 is slidably connected to the bottom of the air supply pipe 8. An exhaust pin 10 is inserted into the top of the gas supply pipe 8, and the outer wall of the exhaust pin 10 is fixedly connected to one end of the inner cavity of the feed chamber 4. An air pump 11 is fixedly connected to one end of the exhaust pin 10, and an air inlet chamber 12 is fixedly connected to the input end of the air pump 11. One side of the outer wall of the air inlet chamber 12 is fixedly connected to the top of one side of the outer wall of the preparation body 1. A circulation chamber 34 is fixedly connected to one end of the outer wall of the preparation body 1 near the air inlet chamber 12, and a liquid delivery pipe 35 is fixedly connected to the output end of the circulation chamber 34. A circulation condenser pipe 36 is fixedly connected to one end of the liquid delivery pipe 35, and one end of the circulation condenser pipe 36 is fixedly connected to the input end of the circulation chamber 34.

[0045] During operation, the leaves of *Hypericum perforatum* are cut off, and the roots are washed. The roots are then dried at a low temperature below 60 degrees Celsius. Finally, the dried roots are pulverized into a fine powder of 80-100 mesh using a pulverizer to obtain selenium compounds. A cover plate 2 is installed on the top of the preparation body 1, and a sealing cap 3 is installed on top of the cover plate 2. A feed hopper 4 is located at the center of the inner cavity of the cover plate 2. Organic acid liquid is poured in from the feed pipe 5 at one end of the top of the feed hopper 4, allowing the organic acid liquid to flow into the preparation body 1 until the liquid level is two-quarters of the way up the preparation body 1. At this point, an electric telescopic mechanism at the center of the top of the inner wall of the feed hopper 4 is activated. The lever 6 moves the feed column 7, located at the output end of the electric telescopic lever 6, downwards, aligning the groove on the outer wall of the feed column 7 with the opening of the feed chamber 4. Selenium compound is then fed into the feed chamber 4 through the feed pipe 5, allowing the selenium compound to enter the groove. Simultaneously, inert gas is injected into the air inlet chamber 12 located at the top of one side of the outer wall of the preparation body 1. The air pump 11, located at the top of the feed chamber 4 near the feed pipe 5, is then activated. The air pump 11 draws the inert gas from the air inlet chamber 12 and discharges it through the exhaust pin 10 at its output end. Since a gas delivery pipe 8 is located at one end of the inner cavity of the feed column 7, and the top of the inner wall of the gas delivery pipe 8 covers the exhaust pin 10, the inert gas discharged from the exhaust pin 10 flows along the gas delivery pipe 8. The elastic piston 9 at the bottom of the gas delivery pipe 8 is pushed open, allowing inert gas to fill the inner wall of the gas inlet chamber 12, squeezing out the organic acid liquid in the gas inlet chamber 12. At this time, the liquid level of the organic acid liquid is three-quarters of the way up the preparation body 1. Then, the electric telescopic rod 6 is activated again, causing the gas delivery pipe 8 to disengage from the exhaust pin 10 and close its opening, preventing the inert gas from continuing to be discharged. At the same time, as the feed column 7 moves downward, its outer wall blocks the outlet of the feed chamber 4, causing the selenium compound temporarily stored in its groove to move downward until it reaches the empty slot at the bottom of the inner wall of the feed chamber 4. The selenium compound then falls into the preparation body 1 through the gap in the empty slot. During this process, as the feed column 7 continues to move downward, it squeezes the inert gas into the preparation body 1, thereby allowing the organic acid liquid to be discharged. A large number of bubbles are generated in the liquid, which carry selenium compounds into the preparation body 1, thereby suppressing the violent reaction caused by the mixing of organic acid liquid and selenium compound. Furthermore, since the temperature of the mixture rises rapidly when the organic acid liquid and selenium compound are mixed, the circulation chamber 34 located on the outer wall of the preparation body 1 near the air inlet chamber 12 is activated. This allows coolant to enter the circulating condenser pipe 36 through the liquid delivery pipe 35, thereby reducing the heat released by the mixture and facilitating subsequent pH value detection. An extension pipe 16 is installed on the outer wall of the feed chamber 4, and a geared disc 15 is installed at the top of one side of the extension pipe 16. A motor 13 drives the geared disc 15 through a first gear rod 14, causing the extension pipe 16 to rotate.This causes the turbine 17, located at the bottom of one side of the outer wall of the extension tube 16, to thoroughly stir the organic acid liquid and selenium compound in the preparation body 1, forming mixture A. Meanwhile, the electric telescopic rod 6 moves the feed column 7 upwards, repeating the above operation. This allows the selenium compound to intermittently carry inert gas bubbles into the preparation body 1, effectively slowing down the exothermic reaction between the selenium compound and the organic acid, and helping to suppress the toxic gases produced after mixing. This further solves the problem that traditional equipment for preparing selenium-enriched water-soluble fertilizers, during use, causes significant safety hazards due to the temperature rise and toxic gas generation accompanying the mixing of selenium compound and organic acid liquid, and also affects the preparation efficiency of the mixture. When the ratio of selenium compound to organic acid liquid added to the preparation body 1 is 1:1.5 to 2.5, a metal antagonist comprising 3% to 5% of the total mixture A is added... An organic multidentate chelating agent is fed into the preparation body 1 through the feed pipe 5 and feed bin 4, and stirred by the turbine 17 to obtain mixture B. Then, using the pump 29, mixture B from the preparation body 1 is fed into the first static mixing pipe 27 (which is existing technology) through the pump pipe 28. During this process, the electrically controlled valve 26 is opened, and the surfactant in the feed bin 25 is fed into the first static mixing pipe 27. The mixture B is flushed through the pipe, ensuring thorough mixing. The mixture is then discharged back into the preparation body 1 through the drain pipe 31 for further mixing with mixture B. The pH of mixture B is then measured using the detection column 33 at the output of the electrode sensor 32. When the pH of mixture B stabilizes at 6.5 to 7.0, the electrically controlled lifting frame 37 is activated, and the mixture B is discharged through the drain trough 40 on the inner wall of the blocking ring 39.

[0046] A motor 13 is fixedly connected to one end of the top of the inner wall of the cover plate 2, and a first gear rod 14 is fixedly connected to the output end of the motor 13. The bottom of the first gear rod 14 is rotatably connected to one end of the bottom of the inner wall of the cover plate 2. A gear disc 15 meshes with one side of the outer wall of the first gear rod 14, and an extension tube 16 is fixedly connected to the inner wall of the gear disc 15. The inner wall of the extension tube 16 is rotatably connected to the outer wall of the feed hopper 4, and a turbine 17 is fixedly connected to the bottom of one side of the outer wall of the extension tube 16. An electrically controlled lifting frame 37 is fixedly connected to the center of the bottom of the main body 1, and a flow-guiding arc block 38 is fixedly connected to the bottom of one side of the inner wall of the electrically controlled lifting frame 37. A liquid-blocking ring 39 is fixedly connected to the output end of the electrically controlled lifting frame 37, and one side of the inner wall of the liquid-blocking ring 39 is slidably connected to the outer wall of the flow-guiding arc block 38. A drain groove 40 is opened in the inner cavity of the liquid-blocking ring 39. A dividing chamber 41 is fixedly connected to the bottom of the inner wall of the main body 1, and several baffles 42 are fixedly connected to the inner wall of the dividing chamber 41.

[0047] During operation, an extension pipe 16 is installed on the outer wall of the feed hopper 4, and a gear disc 15 is installed on the top of one side of the outer wall of the extension pipe 16. A motor 13 is installed at one end of the top of the inner wall of the cover plate 2, and the first gear rod 14 installed at the output end of the motor 13 drives the gear disc 15, causing the extension pipe 16 to drive the turbine 17 installed at the bottom of one side of the outer wall to rotate, mixing the selenium compound with the organic acid liquid. Since a dividing chamber 41 is installed at the bottom of the inner wall of the preparation body 1, and the turbine 17 is located at the bottom opening of the dividing chamber 41, when the selenium compound containing inert gas bubbles is discharged from the feed hopper 4, under the traction of the organic acid liquid discharged by the turbine 17, the selenium compound containing inert gas bubbles moves to the interlayer between the outer wall of the dividing chamber 41 and the inner wall of the preparation body 1. During the mixing and reaction of the selenium compound and the organic acid liquid, heat is generated, causing the mixture A to move upward along the interlayer. During this process, the mixture A is cooled by the circulating condenser pipe 36 and enters the dividing chamber 41. Several baffles 42 are installed on the inner wall, and with the traction force of the turbine 17, the mixture A is fully stirred and discharged from the bottom of the dividing chamber 41. The mixture A comes into contact with the selenium compound and inert gas bubbles that are discharged into the preparation body 1 again, thereby forming a turbulent effect, which makes the selenium compound, organic acid liquid and inert gas more fully mixed. Furthermore, by setting an electrically controlled lifting frame 37 at the center of the bottom of the preparation body 1, and using the flow guiding arc block 38 set on the bottom of one side of the inner wall of the electrically controlled lifting frame 37, the mixture A and the unmixed selenium compound are guided to the interlayer between the preparation body 1 and the dividing chamber 41 for recirculation. When the water-soluble fertilizer is prepared, the electrically controlled lifting frame 37 is activated, and the liquid blocking ring 39 set at its output end is raised, so that the water-soluble fertilizer is discharged from the drain trough 40 set in the inner cavity of the liquid blocking ring 39. This further solves the problem that in the traditional preparation device for deactivating selenium-enriched water-soluble fertilizer, the inert gas is difficult to mix with the selenium compound and organic acid liquid, resulting in poor inhibition effect of the inert gas on toxic gases.

[0048] The bottom of the inner wall of the cover plate 2 is rotatably connected to the end of the first gear rod 14, and one side of the outer wall of the second gear rod 18 meshes with one side of the outer wall of the gear disk 15. The top of one side of the outer wall of the second gear rod 18 has a liquid distribution chamber 19 through it, and the top of the second gear rod 18 is fixedly connected to a condenser threaded pipe 20. The inner wall of the condenser threaded pipe 20 is rotatably connected to a temperature-conducting column 21. One side of the outer wall of the liquid distribution chamber 19 is fixedly connected to one side of the inner wall of the cover plate 2, and the top of the outer wall of the liquid distribution chamber 19 near the inner wall of the cover plate 2 is fixedly connected to an air inlet pipe 22. One end of the air inlet pipe 22 is fixedly connected to the bottom of the inner cavity of the cover plate 2. The side of the outer wall of the liquid distribution chamber 19 away from the air inlet pipe 22 is fixedly connected to an exhaust pipe 23, and the bottom of the side of the outer wall of the liquid distribution chamber 19 near the exhaust pipe 23 is fixedly connected to a waste liquid pipe 24.

[0049] During operation, a liquid distribution chamber 19 is provided on one side of the inner wall of the cover plate 2, and an air inlet pipe 22 is provided on the top of one side of the outer wall of the liquid distribution chamber 19, with one end of the air inlet pipe 22 penetrating the cover plate 2. Since the selenium compound and organic acid liquid will produce toxic gas when mixed, and the preparation body 1 is a sealed tank, under the influence of air pressure, the toxic gas moves upward to the bottom of the cover plate 2 and enters the liquid distribution chamber 19 through the air inlet pipe 22. Since a second gear rod 18 is provided at the bottom of the inner wall of the cover plate 2 near the first gear rod 14, and the top of one side of the outer wall of the second gear rod 18 penetrates the bottom of the liquid distribution chamber 19, and a condensing threaded pipe 20 is provided at the top of the second gear rod 18, the motor 13 drives the turbine 17 to rotate. When rotating, the second gear rod 18 drives the condensing threaded tube 20 to rotate. Since the top of the liquid distribution chamber 19 is provided with a temperature-conducting column 21 and the output end of the temperature-conducting column 21 is located in the inner wall of the condensing threaded tube 20, the temperature-conducting column 21 is used to transfer the low temperature to the surface of the condensing threaded tube 20, and the toxic gas discharged from the air inlet pipe 22 is blown toward the surface of the condensing threaded tube 20, so that the liquid in the toxic gas is separated from the gas. The toxic gas is discharged along the exhaust pipe 23 provided on the outer wall of the liquid distribution chamber 19 away from the air inlet pipe 22, while the separated liquid drips down the surface of the condensing threaded tube 20 into the liquid distribution chamber 19, and is discharged along the waste liquid pipe 24 provided on the outer wall of the liquid distribution chamber 19 near the exhaust pipe 23.

[0050] A feeding hopper 25 is fixedly connected to one end of the top of the cover plate 2, and an electric control valve 26 is fixedly connected to the bottom of the feeding hopper 25. A first static mixing pipe 27 is fixedly connected to the output end of the electric control valve 26, and a liquid extraction pipe 28 is fixedly connected to one end of the first static mixing pipe 27. The outer wall of the liquid extraction pipe 28 is fixedly connected to the inner cavity of the cover plate 2. A liquid extraction pump 29 is fixedly connected to the middle of the first static mixing pipe 27, and a second static mixing pipe 30 is fixedly connected to the output end of the liquid extraction pump 29. A drain pipe 31 is fixedly connected to one end of the second static mixing pipe 30, and the outer wall of the drain pipe 31 is fixedly connected to the end of the inner cavity of the cover plate 2 near the liquid extraction pipe 28. An electrode sensor 32 is fixedly connected to the top of the cover plate 2 between the feeding hopper 25 and the liquid extraction pump 29, and a detection column 33 is fixedly connected to the output end of the electrode sensor 32. The outer wall of the detection column 33 is fixedly connected to the end of the inner cavity of the cover plate 2 away from the liquid extraction pipe 28.

[0051] During operation, a feeding hopper 25 is provided at one end of the top of the cover plate 2, into which the surfactant is injected. When the selenium compound, organic acid liquid, metal antagonist, and organic multidentate chelating agent are mixed and form mixture B, the pump 29 is started to allow mixture B to enter the first static mixing tube 27 through the pumping pipe 28. During this period, the electrically controlled valve 26 at the bottom of the feeding hopper 25 is activated to inject the surfactant into the first static mixing tube 27, and the mixture B is used to flush and mix the surfactant in the first static mixing tube 27. The mixture B containing the surfactant is then discharged into the second static mixing tube 30 through the output end of the pump 29. Since the spacing between the spiral blades in the second static mixing tube 30 is smaller than that in the first static mixing tube... The spiral blades inside 27 allow some of the surfactant that has not yet been fully mixed with mixture B to undergo secondary mixing in the second static mixing tube 30. Subsequently, the mixture is discharged into the preparation body 1 through the drain pipe 31 at one end of the second static mixing tube 30. At this time, the pH value of mixture B is detected by the detection column 33 at the output end of the electrode sensor 32 located between the feeding chamber 25 and the pump 29 at the top of the cover plate 2. When the pH value does not meet the expected value, the above operation is repeated. Since the amounts of selenium compound, organic acid liquid, metal antagonist and organic multidentate chelating agent are fixed, surfactant is added in small amounts multiple times in proportion to adjust the pH value of mixture B to between 6.5 and 7.0.

[0052] The working principle of the equipment for preparing heavy metal deactivation and selenium-enriched water-soluble fertilizer for acidified farmland will be explained in detail below.

[0053] like Figures 1-12As shown, the leaves of *Hedyotis diffusa* are cut off, and the roots are washed. The roots are then dried at a low temperature below 60 degrees Celsius. Finally, the dried roots are pulverized into a fine powder of 80-100 mesh using a pulverizer to obtain selenium compounds. A cover plate 2 is installed on the top of the preparation body 1, and a sealing cap 3 is installed on top of the cover plate 2. A feed hopper 4 is set at the center of the inner cavity of the cover plate 2. Organic acid liquid is poured in from the feed pipe 5 at one end of the top of the feed hopper 4, allowing the organic acid liquid to flow into the preparation body 1 until the liquid level is two-quarters of the way up the preparation body 1. At this point, an electric telescopic device at the center of the top of the inner wall of the feed hopper 4 is activated. The lever 6 moves the feed column 7, located at the output end of the electric telescopic lever 6, downwards, aligning the groove on the outer wall of the feed column 7 with the opening of the feed chamber 4. Selenium compound is then fed into the feed chamber 4 through the feed pipe 5, allowing the selenium compound to enter the groove. Simultaneously, inert gas is injected into the air inlet chamber 12 located at the top of one side of the outer wall of the preparation body 1. The air pump 11, located at the top of the feed chamber 4 near the feed pipe 5, is then activated. The air pump 11 draws the inert gas from the air inlet chamber 12 and discharges it through the exhaust pin 10 at its output end. Since a gas delivery pipe 8 is located at one end of the inner cavity of the feed column 7, and the top of the inner wall of the gas delivery pipe 8 covers the exhaust pin 10, the inert gas discharged from the exhaust pin 10 flows along the gas delivery pipe 8. The elastic piston 9 at the bottom of the gas delivery pipe 8 is pushed open, allowing inert gas to fill the inner wall of the gas inlet chamber 12, squeezing out the organic acid liquid in the gas inlet chamber 12. At this time, the liquid level of the organic acid liquid is three-quarters of the way up the preparation body 1. Then, the electric telescopic rod 6 is activated again, causing the gas delivery pipe 8 to disengage from the exhaust pin 10 and close its opening, preventing the inert gas from continuing to be discharged. At the same time, as the feed column 7 moves downward, its outer wall blocks the outlet of the feed chamber 4, causing the selenium compound temporarily stored in its groove to move downward until it reaches the empty slot at the bottom of the inner wall of the feed chamber 4. The selenium compound then falls into the preparation body 1 through the gap in the empty slot. During this process, as the feed column 7 continues to move downward, it squeezes the inert gas into the preparation body 1, thereby allowing the organic acid liquid to be discharged. A large number of bubbles are generated in the liquid, which carry selenium compounds into the preparation body 1, thereby suppressing the violent reaction caused by the mixing of organic acid liquid and selenium compound. Furthermore, since the temperature of the mixture rises rapidly when the organic acid liquid and selenium compound are mixed, the circulation chamber 34 located on the outer wall of the preparation body 1 near the air inlet chamber 12 is activated. This allows coolant to enter the circulating condenser pipe 36 through the liquid delivery pipe 35, thereby reducing the heat released by the mixture and facilitating subsequent pH value detection. An extension pipe 16 is installed on the outer wall of the feed chamber 4, and a geared disc 15 is installed at the top of one side of the extension pipe 16. A motor 13 drives the geared disc 15 through a first gear rod 14, causing the extension pipe 16 to rotate.This causes the turbine 17, located at the bottom of one side of the outer wall of the extension tube 16, to thoroughly stir the organic acid liquid and selenium compound in the preparation body 1, forming mixture A. Meanwhile, the electric telescopic rod 6 moves the feed column 7 upwards, repeating the above operation. This allows the selenium compound to intermittently carry inert gas bubbles into the preparation body 1, effectively slowing down the exothermic reaction between the selenium compound and the organic acid, and helping to suppress the toxic gases produced after mixing. This further solves the problem that traditional equipment for preparing selenium-enriched water-soluble fertilizers, during use, causes significant safety hazards due to the temperature rise and toxic gas generation accompanying the mixing of selenium compound and organic acid liquid, and also affects the preparation efficiency of the mixture. When the ratio of selenium compound to organic acid liquid added to the preparation body 1 is 1:1.5 to 2.5, a metal antagonist comprising 3% to 5% of the total mixture A is added... An organic multidentate chelating agent is fed into the preparation body 1 through the feed pipe 5 and feed bin 4, and stirred by the turbine 17 to obtain mixture B. Then, using the pump 29, mixture B from the preparation body 1 is fed into the first static mixing pipe 27 (which is existing technology) through the pump pipe 28. During this process, the electrically controlled valve 26 is opened, and the surfactant in the feed bin 25 is fed into the first static mixing pipe 27. The mixture B is flushed through the pipe, ensuring thorough mixing. The mixture is then discharged back into the preparation body 1 through the drain pipe 31 for further mixing with mixture B. The pH of mixture B is then measured using the detection column 33 at the output of the electrode sensor 32. When the pH of mixture B stabilizes at 6.5 to 7.0, the electrically controlled lifting frame 37 is activated, and the mixture B is discharged through the drain trough 40 on the inner wall of the blocking ring 39.

[0054] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land, characterized in that: The preparation method includes the following steps: S1: By cutting the leaves of Viola yedoensis and washing the roots of Viola yedoensis, the leaves are dried at a low temperature below 60 degrees Celsius. Finally, the dried Viola yedoensis is pulverized into a fine powder of 80-100 mesh to obtain selenium compounds. S2: By feeding the organic acid liquid into the preparation body (1) through the feed pipe (5), and then feeding the selenium compound into the feed hopper 4 through the feed pipe (5), the ratio of selenium compound to organic acid liquid is 1:1.5 to 2.

5. At this time, the motor (13) drives the turbine (17) to stir the selenium compound and organic acid liquid, and obtain mixture A. S3: The metal antagonist and the organic multidentate chelating agent are fed into the preparation body (1) through the feed pipe (5) in sequence according to the total proportion of mixture A of 3% to 5%. Then, the metal antagonist, the organic multidentate chelating agent and mixture A are fully mixed by the turbine (17) to obtain mixture B. S4: A portion of mixture B is pumped from the pumping pipe (28) into the first static mixing pipe (27) by the pumping pump (29). At this time, the electric control valve (26) is opened so that the surfactant in the feeding bin (25) enters the first static mixing pipe (27) and is fully mixed by the flushing of mixture B. Then, it is discharged back into the preparation body (1) through the drain pipe (31) and stirred by the turbine (17) to adjust the pH value of mixture B to 6.5 to 7.

0.

2. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 1, characterized in that: The preparation body (1) includes a cover plate (2) fixedly connected to the top of the preparation body (1), and a sealing cap (3) installed on the top of the cover plate (2). A feeding hopper (4) is fixedly connected to the center of the inner cavity of the cover plate (2), and a feeding pipe (5) is fixedly connected to one end of the top of the feeding hopper (4). The outer wall of the feeding pipe (5) is slidably connected to the inner cavity of the sealing cap (3). An electric telescopic rod (6) is fixedly connected to the center of the top of the inner wall of the feeding hopper (4), and a discharge column (7) is fixedly connected to the output end of the electric telescopic rod (6). One end of the inner cavity of the material column (7) is fixedly connected to an air supply pipe (8), and the bottom of the air supply pipe (8) is slidably connected to an elastic piston (9). An exhaust pin (10) is inserted into the top of the air supply pipe (8), and the outer wall of the exhaust pin (10) is fixedly connected to one end of the inner cavity of the feed chamber (4). One end of the exhaust pin (10) is fixedly connected to an air pump (11), and the input end of the air pump (11) is fixedly connected to an air inlet chamber (12). One side of the outer wall of the air inlet chamber (12) is fixedly connected to the top of one side of the outer wall of the preparation body (1).

3. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 2, characterized in that: A motor (13) is fixedly connected to one end of the top of the inner wall of the cover plate (2), and a first gear rod (14) is fixedly connected to the output end of the motor (13). The bottom of the first gear rod (14) is rotatably connected to one end of the bottom of the inner wall of the cover plate (2). A gear plate (15) meshes with one side of the outer wall of the first gear rod (14), and an extension tube (16) is fixedly connected to the inner wall of the gear plate (15). The inner wall of the extension tube (16) is rotatably connected to the outer wall of the feed hopper (4), and a turbine (17) is fixedly connected to the bottom of one side of the outer wall of the extension tube (16).

4. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 3, characterized in that: The bottom of the inner wall of the cover plate (2) is rotatably connected to the end of the first gear rod (14), and one side of the outer wall of the second gear rod (18) meshes with one side of the outer wall of the gear plate (15). The top of one side of the outer wall of the second gear rod (18) is penetrated by a liquid distribution chamber (19), and the top of the second gear rod (18) is fixedly connected to a condensing threaded tube (20), and the inner wall of the condensing threaded tube (20) is rotatably connected to a temperature-conducting column (21).

5. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 4, characterized in that: One side of the outer wall of the liquid distribution chamber (19) is fixedly connected to one side of the inner wall of the cover plate (2), and an air inlet pipe (22) is fixedly connected to the top of the outer wall of the liquid distribution chamber (19) near the inner wall of the cover plate (2), and one end of the air inlet pipe (22) is fixedly connected to the bottom of the inner cavity of the cover plate (2). An exhaust pipe (23) is fixedly connected to the outer wall of the liquid distribution chamber (19) away from the air inlet pipe (22), and a waste liquid pipe (24) is fixedly connected to the bottom of the outer wall of the liquid distribution chamber (19) near the exhaust pipe (23).

6. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 5, characterized in that: A feeding bin (25) is fixedly connected to one end of the top of the cover plate (2), and an electric control valve (26) is fixedly connected to the bottom of the feeding bin (25). A first static mixing pipe (27) is fixedly connected to the output end of the electric control valve (26), and a liquid extraction pipe (28) is fixedly connected to one end of the first static mixing pipe (27). The outer wall of the liquid extraction pipe (28) is fixedly connected to the inner cavity of the cover plate (2). A liquid extraction pump (29) is fixedly connected to the middle of the first static mixing pipe (27), and a second static mixing pipe (30) is fixedly connected to the output end of the liquid extraction pump (29). A drain pipe (31) is fixedly connected to one end of the second static mixing pipe (30), and the outer wall of the drain pipe (31) is fixedly connected to the end of the inner cavity of the cover plate (2) near the liquid extraction pipe (28).

7. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 6, characterized in that: An electrode sensor (32) is fixedly connected to the top of the cover plate (2) between the feeding bin (25) and the pump (29), and a detection column (33) is fixedly connected to the output end of the electrode sensor (32), while the outer wall of the detection column (33) is fixedly connected to the end of the inner cavity of the cover plate (2) away from the pump (28).

8. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 7, characterized in that: The outer wall of the preparation body (1) is fixedly connected to a circulation chamber (34) at one end near the air inlet chamber (12), and the output end of the circulation chamber (34) is fixedly connected to a liquid delivery pipe (35). One end of the liquid delivery pipe (35) is fixedly connected to a circulation condenser pipe (36), and one end of the circulation condenser pipe (36) is fixedly connected to the input end of the circulation chamber (34).

9. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 8, characterized in that: An electrically controlled lifting frame (37) is fixedly connected to the center of the bottom of the preparation body (1), and a drainage arc block (38) is fixedly connected to the bottom of one side of the inner wall of the electrically controlled lifting frame (37). A liquid blocking ring (39) is fixedly connected to the output end of the electrically controlled lifting frame (37), and one side of the inner wall of the liquid blocking ring (39) is slidably connected to the outer wall of the drainage arc block (38). A drainage groove (40) is opened in the inner cavity of the liquid blocking ring (39).

10. The equipment for preparing a water-soluble fertilizer for deactivating heavy metals in acidified arable land according to claim 9, characterized in that: The bottom of the inner wall of the preparation body (1) is fixedly connected to a dividing chamber (41), and the inner wall of the dividing chamber (41) is fixedly connected to several baffles (42).

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