A method for preparing a compound fertilizer using lithium mica slag as a raw material and an apparatus for preparing the same

Abstract

This invention provides a method and equipment for preparing compound fertilizer using lepidolite slag as raw material. The method includes the following steps: S1, pretreatment: lepidolite slag is taken, crushed, and screened to obtain lepidolite slag particles with a particle size of 40 to 400 mesh; S2, activation: lepidolite slag is thoroughly mixed with an activator and a flux, and then ground to obtain powder with a particle size less than 80 mesh, wherein the activator is sodium hydroxide and anhydrous sodium carbonate, and the flux is calcium oxide; S3, sintering: the activated and ground powder is sintered at a temperature of 650℃-1000℃ for 0.5 h-5 h; S4, compounding: trace elements are added to the sintered fertilizer, mixed evenly, and ground into powder. The method for preparing compound fertilizer using lepidolite slag as raw material provided by this invention can effectively utilize lepidolite slag to prepare compound fertilizer, solving the environmental problem of large-scale accumulation of lepidolite slag and realizing the resource utilization of waste.

Description

Technical Field

[0001] This invention relates to the field of compound fertilizer preparation, and in particular to a method and equipment for preparing compound fertilizer using lithium mica slag as raw material. Background Technology

[0002] With the rapid development of new energy storage industries such as lithium batteries, the output of lithium mica waste has increased significantly, causing serious environmental impact. Large amounts of lithium mica waste not only pollute the environment but also occupy arable land, and urgently need to be disposed of.

[0003] Lepidolite, an acid-rich mineral, is abundant in my country. Lepidolite slag, a waste product generated during lithium extraction from lepidolite, is rich in elements such as silicon, calcium, aluminum, and potassium. If the silicon, calcium, and potassium in lepidolite can be fully utilized as fertilizer, the resource utilization of solid waste can be effectively achieved.

[0004] Generally, lepidolite slag has a high silicon content, up to 50%, mainly existing in the form of stable silicate minerals and quartz minerals; however, the effective silicon content is very low, less than 5%. Therefore, it needs to be activated to increase the effective silicon content. In addition, lepidolite slag is also rich in calcium and a certain amount of potassium. This patent, based on the properties of lepidolite slag, adds potassium and magnesium elements while activating silicon to produce silicon-calcium-potassium-magnesium fertilizer.

[0005] Therefore, it is necessary to provide a method for preparing compound fertilizer using lithium mica slag as raw material to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a method and equipment for preparing compound fertilizer using lithium mica slag as raw material, which solves the problem of utilizing lithium mica slag as waste to prepare compound fertilizer.

[0007] To solve the above-mentioned technical problems, the present invention provides a method for preparing compound fertilizer using lithium mica slag as raw material, comprising the following steps:

[0008] S1. Pretreatment: Take lepidolite slag, crush and screen it to obtain lepidolite slag particles with a particle size of 40 to 400 mesh.

[0009] S2. Activation: The lithium mica slag is thoroughly mixed with the activator and flux, and then ground to obtain a powder with a particle size of less than 80 mesh. The activator is sodium hydroxide and anhydrous sodium carbonate, and the flux is calcium oxide.

[0010] S3. Sintering: Sinter the activated and ground powder at a temperature of 650℃-1000℃ for 0.5 h-5 h;

[0011] S4. Compounding: Add trace elements to the sintered fertilizer, mix evenly and grind into powder, then add bentonite and starch and mix evenly, and granulate in a disc granulator to obtain compound fertilizer. The trace elements are magnesium and potassium.

[0012] Preferably, the trace elements magnesium and potassium are added at 3% and 4% of the mass fraction of lepidolite slag, respectively.

[0013] Preferably, in S2, the mass ratio of lepidolite slag to sodium hydroxide is 1:(0.05-0.1); the mass ratio of lepidolite slag to activator sodium carbonate is 1:(0.05-0.2); and the mass ratio of lepidolite slag to calcium oxide is 1:(0.05-0.2).

[0014] Preferably, the total amount of bentonite and starch in S4 is 2.5%-3.5% of the mica residue mass, of which bentonite accounts for 60%-70% and starch accounts for 30%-40%.

[0015] This invention also provides an apparatus for preparing compound fertilizer using lepidolite slag as raw material, applicable to the aforementioned method for preparing compound fertilizer using lepidolite slag as raw material, comprising:

[0016] A screening assembly, comprising a support frame, a screen structure, a drive device, and multiple elastic structures, wherein the screen structure is obliquely connected to the support frame via multiple elastic structures, and the drive device is used to drive the screen structure to vibrate.

[0017] A conveying device is mounted on the support frame and located below the screen structure;

[0018] A striking device, comprising a sliding sleeve, a motor, a rotating shaft, a connecting plate, and a striking roller, wherein the sliding sleeve is slidably mounted on the side plate of the conveying device, the motor is horizontally mounted on the sliding sleeve, the rotating shaft is connected to the output shaft of the motor and located below the screen structure, and the striking roller is connected to the rotating shaft through the connecting plate.

[0019] Preferably, the conveyor belt of the conveying device is provided with assembly holes, and the equipment for preparing compound fertilizer using lithium mica slag as raw material further includes an assembly structure. The assembly structure includes a driving component, a connecting frame, and an assembly shaft. The connecting frame is slidably mounted on the sliding sleeve, and the assembly shaft is installed at the bottom of the connecting frame. The driving component is used to drive the connecting frame to rise or fall. Along the conveying direction of the conveyor belt, the assembly shaft and the assembly holes are located on the same plane.

[0020] Preferably, the equipment for preparing compound fertilizer using lithium mica slag as raw material further includes a receiving structure, which includes a mounting frame, a lifting cylinder, and a collecting hopper. The bottom end of the mounting frame is installed on the sliding sleeve, the lifting cylinder is installed on the top end of the mounting frame, and the collecting hopper is suspended above the screen surface of the screen structure and is detachably connected to the output end of the lifting cylinder.

[0021] Preferably, the driving component includes a slide bar structure and a driving arm. The slide bar structure is mounted on the mounting bracket, one end of the driving arm is connected to the slide bar structure, and the other end is connected to the output end of the lifting cylinder.

[0022] Preferably, a bushing is provided inside the assembly hole.

[0023] Preferably, a connecting sleeve is installed on the sliding sleeve, and the assembly shaft passes through the connecting sleeve.

[0024] Compared with related technologies, the compound fertilizer preparation method using lithium mica slag as raw material provided by the present invention has the following beneficial effects:

[0025] This invention provides a method for preparing compound fertilizer using lithium mica slag as raw material, which can effectively utilize lithium mica slag to prepare compound fertilizer, solve the environmental problem of large-scale accumulation of lithium mica slag, and realize the resource utilization of waste.

[0026] Furthermore, through optimized preparation processes, the silicon content and quality of compound fertilizers have been improved. At the same time, the calcium element in lithium mica slag and the compounded potassium and magnesium elements are utilized to make it more conducive to plant absorption and utilization, thereby improving the yield and quality of crops. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the steps of a method for preparing compound fertilizer using lithium mica slag as raw material, as provided by the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the compound fertilizer preparation equipment using lithium mica residue as raw material provided by the present invention.

[0029] Figure 3 This is a partial structural schematic diagram of the equipment for preparing compound fertilizer using lithium mica residue as raw material provided by the present invention;

[0030] Figure 4 This is a side view of the equipment for preparing compound fertilizer using lithium mica slag as raw material provided by the present invention.

[0031] Figure 5 This is a schematic diagram illustrating the principle of the bonding between the receiving structure and the screen surface of the screen structure provided by the present invention. Figure 5 (a) is a schematic diagram showing the lifting cylinder lowering the collection bucket and causing the drive arm to descend along the slide bar structure to its maximum stroke. Figure 5 (b) is a schematic diagram showing the lifting cylinder lowering the collection bucket to fit the screen surface of the screen structure and the assembly shaft being inserted into the assembly hole;

[0032] Figure 6 A schematic diagram illustrating the working principle of the striking device provided by this invention.

[0033] Numbering on the map:

[0034] 1. Screening assembly; 11. Support frame; 12. Screen structure; 13. Elastic structure; 14. Drive device;

[0035] 2. Conveying device; 21. Side plate; 22. Conveyor belt; 221. Assembly hole;

[0036] 3. Striking device; 31. Sliding sleeve; 32. Motor; 33. Rotating shaft; 34. Connecting plate; 35. Striking roller; 311. Connecting sleeve;

[0037] 4. Supporting structure; 41. Mounting frame; 42. Lifting cylinder; 43. Collection hopper;

[0038] 5. Assembly structure; 51. Drive components; 52. Connecting frame; 53. Assembly shaft;

[0039] 511. Slide rod structure; 512. Drive arm. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] This invention provides a method and equipment for preparing compound fertilizer using lithium mica slag as raw material.

[0042] Please refer to the following: Figure 1 In one embodiment of the present invention, the method for preparing compound fertilizer using lithium mica slag as raw material includes the following steps:

[0043] S1. Pretreatment: Take lepidolite slag, crush and screen it to obtain lepidolite slag particles with a particle size of 40 to 400 mesh.

[0044] S2. Activation: The lithium mica slag is thoroughly mixed with the activator and flux, and then ground to obtain a powder with a particle size of less than 80 mesh. The activator is sodium hydroxide and anhydrous sodium carbonate, and the flux is calcium oxide.

[0045] S3. Sintering: Sinter the activated and ground powder at a temperature of 650℃-1000℃ for 0.5 h-5 h;

[0046] S4. Compounding: Add trace elements to the sintered fertilizer, mix evenly and grind into powder, then add bentonite and starch and mix evenly, and granulate in a disc granulator to obtain compound fertilizer. The trace elements are magnesium and potassium.

[0047] By adding activators and co-solvents to lepidolite slag and then calcining it at high temperature, the OH- in sodium hydroxide will break the strong Si-O and Al-O double bonds in the lepidolite slag. Some silicon will be released in the form of sodium metasilicate and silicic acid, and some silicon will form soluble sodium silicate.

[0048] Calcium oxide reacts with water to form calcium hydroxide, producing OH- ions that attack the Si-O and Al-O double bonds in lepidolite slag. Simultaneously, calcium hydroxide reacts with silicon-containing compounds such as sodium silicate produced: Na₂SiO₃ + Ca(OH)₂ → CaSiO₃↓ + 2NaOH. This reaction allows silicon to exist as calcium silicate precipitate. Although silicon exists as calcium silicate precipitate, this precipitate state can be transformed during subsequent reactions with additives. Under alkaline conditions, calcium silicate reacts with sodium carbonate: Na₂CO₃ + CaSiO₃ → CaCO₃↓ + Na₂SiO₃. Calcium silicate precipitate serves as an intermediate form of silicon in the reaction process, providing a basis for further silicon activation. The generated sodium hydroxide can then continue to participate in the decomposition of silicates in lepidolite slag. This continuously propels the reaction towards the formation of water-soluble silicon, creating orthosilicate components such as sodium silicate and orthosilicate, which are easily utilized by plants, thus activating silicon.

[0049] This invention can effectively utilize lithium mica residue to prepare compound fertilizer, solving the environmental problem of large-scale accumulation of lithium mica residue and realizing the resource utilization of waste.

[0050] By optimizing the preparation process, the silicon content and quality of the compound fertilizer have been improved. At the same time, the calcium element in the lithium mica slag and the compounded potassium and magnesium elements are utilized to make it more conducive to plant absorption and utilization, thereby improving the yield and quality of crops.

[0051] The mica slag selected in this patent was characterized by X-ray fluorescence spectroscopy (XRF) to determine the silicon content in the mica slag. Its chemical composition is shown below:

[0052] The results showed that the lithium mica slag contained sufficient calcium and silicon with great activation potential.

[0053] The trace elements magnesium and potassium are added at 3% and 4% of the mass fraction of lepidolite slag, respectively.

[0054] In S2, the mass ratio of lepidolite residue to sodium hydroxide is 1:(0.05-0.1); the mass ratio of lepidolite residue to activator sodium carbonate is 1:(0.05-0.2); and the mass ratio of lepidolite residue to calcium oxide is 1:(0.05-0.2).

[0055] The total amount of bentonite and starch used in S4 is 2.5%-3.5% of the mica residue mass, of which bentonite accounts for 60%-70% and starch accounts for 30%-40%.

[0056] Specifically:

[0057] Example for comparison:

[0058] Lithium methane slag was taken, crushed, and screened to obtain 100-mesh lithium methane slag particles. No further processing was performed as a control example. Example 1

[0059] A method for preparing compound fertilizer using lepidolite slag as raw material includes the following steps:

[0060] S1. Pretreatment: Take lepidolite slag, crush and screen it to obtain lepidolite slag particles with a particle size of 100 mesh.

[0061] S2, Activation: The ground lithium mica residue is processed without adding an activator.

[0062] S3. Sintering: The activated and ground powder is sintered to obtain a block material. The sintering temperature is 750℃ and the sintering time is 2 h.

[0063] S4. Compounding: Add trace elements magnesium and potassium to the sintered fertilizer, with magnesium (using magnesium chloride as raw material) and potassium (using potassium chloride as raw material) added at 3% and 4% of the mica residue mass, respectively. Mix and compound using a mixer for about 15-30 minutes, then grind into powder. Add bentonite and starch to the compounded fertilizer; the total amount of bentonite and starch is about 3% of the mica residue mass, with bentonite accounting for 60%-70% and starch accounting for 30%-40%. Granulate in a disc granulator, with the rotation speed generally controlled at 30-50 rpm. The finished granules have a diameter between 1-4 mm, which is the compound fertilizer prepared using lithium mica residue. Example 2

[0064] S1. Pretreatment: Take lepidolite slag, crush and screen it to obtain lepidolite slag particles with a particle size of 100 mesh.

[0065] S2. Activation: The ground lepidolite slag is thoroughly mixed with activator sodium hydroxide, anhydrous sodium carbonate, and flux calcium oxide, and then ground to obtain a powder with a particle size of less than 80 mesh. The amount of activator sodium hydroxide added is 1:0.10 by mass ratio of lepidolite slag to sodium hydroxide; the amount of flux sodium carbonate added is 1:0.10 by mass ratio of lepidolite slag to sodium carbonate; and the amount of flux calcium oxide added is 1:0.10 by mass ratio of lepidolite slag to calcium oxide.

[0066] S3. Sintering: The activated and ground powder is sintered to obtain a block material. The sintering temperature is 750℃ and the sintering time is 2 hours.

[0067] S4. Compounding: The compounding process is the same as in Example 1. Example 3

[0068] S1. Pretreatment: Take lepidolite slag, crush and screen it to obtain lepidolite slag particles with a particle size of 100 mesh.

[0069] S2. Activation: The ground lepidolite slag is thoroughly mixed with activator sodium hydroxide, anhydrous sodium carbonate, and flux calcium oxide, and then ground to obtain a powder with a particle size of less than 80 mesh. The amount of activator sodium hydroxide added is 1:0.10 (mass ratio of lepidolite slag to sodium hydroxide in the activator), the amount of flux sodium carbonate added is 1:0.2 (mass ratio of lepidolite slag to sodium carbonate), and the amount of flux calcium oxide added is 1:0.05 (mass ratio of lepidolite slag to calcium oxide).

[0070] S3. Sintering: The activated and ground powder is sintered to obtain a block material. The sintering temperature is 750℃ and the sintering time is 2 hours.

[0071] S4. Compounding: The compounding process is the same as in Example 1.

[0072] Example 4

[0073] A method for preparing compound fertilizer using lepidolite slag as raw material includes the following steps:

[0074] S1. Pretreatment: Take lepidolite slag, crush and screen it to obtain lepidolite slag particles with a particle size of 100 mesh.

[0075] S2. Activation: The ground lepidolite slag is thoroughly mixed with activator sodium hydroxide, anhydrous sodium carbonate, and flux calcium oxide, and then ground to obtain a powder with a particle size of less than 80 mesh. The amount of activator sodium hydroxide added is 1:0.05 based on the mass ratio of lepidolite slag to sodium hydroxide in the activator; the amount of flux sodium carbonate added is 1:0.1 based on the mass ratio of lepidolite slag to sodium carbonate; and the amount of flux calcium oxide added is 1:0.2 based on the mass ratio of lepidolite slag to calcium oxide.

[0076] S3. Sintering: The activated and ground powder is sintered to obtain a block material. The sintering temperature is 750℃ and the sintering time is 2 hours.

[0077] S4. Compounding: The compounding process is the same as in Example 1.

[0078] Detection of effective silicon content:

[0079] After multiple reductions of the solid sample, take out about 10 g and grind it quickly until it passes through a 0.5 mm sieve (or a 0.1 mm sieve if the sample is wet). Mix it thoroughly and place it in a clean, dry container. Weigh 0.2 g of the sample (accurate to 0.1 mg) and place it in a 250 mL volumetric flask. Add 150 mL of hydrochloric acid solution preheated to 28℃-30℃, stopper the flask tightly, and shake the volumetric flask to disperse the sample in the solution. Keep the solution temperature between 28℃ and 30℃ and shake with a shaker set to a frequency of (180+20 r / min) for 30 min. Then remove the volumetric flask, cool it to room temperature, dilute it with water to the mark, mix it well, filter it dry, discard the first few milliliters of filtrate, and the filtrate is ready for testing.

[0080] The effective silicon in the prepared compound fertilizer was determined by plasma atomic emission spectrometry (ICP-AES). The principle is that silicon in the sample solution is atomized and excited to a high energy state in an ICP light source. When the high-energy atoms transition to the gaseous state, they produce electromagnetic radiation with characteristic wavelengths. The emission intensity is directly proportional to the silicon atom concentration.

[0081] The effective silicon content is calculated according to formula (1):

[0082] SiO2 (%) = ;

[0083] In the formula The mass concentration of silicon in the sample solution obtained from the working curve is expressed in micrograms per milliliter (μg / mL). 0 represents the mass concentration of silicon in the blank solution obtained from the working curve, in micrograms per milliliter (μg / mL); D represents the dilution factor of the sample solution during the determination; 250 represents the volume of the sample solution, in milliliters (mL); m represents the mass of the sample, in grams (g); and 106 represents the coefficient for converting the unit to mg.

[0084] The average of the parallel silicon measurements is taken as the final result, rounded to two decimal places. The results of the implementation case are as follows:

[0085] Compared with the control example, Examples 1-4 show that the preparation method has a significant effect on silicon activation. The effective silicon content in the compound fertilizer sample prepared in Example 2 is higher than that in the control example. The reason is:

[0086] The decrease in effective silicon content between Example 1 and Example 2 is due to the absence of alkali substances for activation. The silicon element in the crystal is in a crystalline state, and calcination alone cannot destroy the strong Si-O and Al-O bond structure in the mica slag, resulting in a low effective silicon content.

[0087] The decrease in effective silicon content in Example 3 compared to Example 2 is due to the lower proportion of calcium oxide as a co-solvent. During the activation process, calcium oxide participates in breaking the Si-O and Al-O bond structures and generates OH-. When the calcium oxide content is too low, the OH- concentration is insufficient, and the reaction rate is slow. Under the premise of relatively high sodium carbonate content, some side reactions may occur or the reaction may proceed in a direction that is not conducive to the formation of effective silicon, thereby reducing the effective silicon content.

[0088] The decrease in effective silicon content in Example 4 compared to Comparative Example 2 is due to the lower proportion of sodium hydroxide. Sodium hydroxide has the ability to break chemical bonds in the silicon of mica slag during activation, especially Si-O bonds. When the sodium hydroxide content is low, its ability to break chemical bonds is limited, and it cannot fully open the structure of the silicon in the mica slag. It also affects the synergistic reaction with other additives (such as calcium oxide and Na2CO3), affecting the entire activation process and resulting in insufficient effective silicon production.

[0089] According to the national standard GB / T 36207-2018 "Silicon-Calcium-Potassium-Magnesium Fertilizer", Class I compound fertilizers should have an effective silicon content greater than 9%, a calcium content greater than 20%, a potassium content greater than 3%, a magnesium content greater than 2%, and a particle size between 1 mm and 4.75 mm. This Example 2 meets all the corresponding requirements and can be used as a standard-compliant compound fertilizer.

[0090] The present invention also provides a device for preparing compound fertilizer using lithium mica slag as raw material.

[0091] Please see Figure 2 and Figure 3A compound fertilizer preparation device using lepidolite slag as raw material, used in the aforementioned compound fertilizer preparation method using lepidolite slag as raw material, comprising:

[0092] Screening assembly 1 includes a support frame 11, a screen structure 12, a drive device 14, and multiple elastic structures 13. The screen structure 12 is obliquely connected to the support frame 11 through the multiple elastic structures 13. The drive device 14 is used to drive the screen structure 12 to vibrate.

[0093] Conveying device 2, which is mounted on the support frame 11 and located below the screen structure 12;

[0094] The striking device 3 includes a sliding sleeve 31, a motor 32, a rotating shaft 33, a connecting plate 34, and a striking roller 35. The sliding sleeve 31 is slidably mounted on the side plate 21 of the conveying device 2. The motor 32 is horizontally mounted on the sliding sleeve 31. The rotating shaft 33 is connected to the output shaft of the motor 32 and is located below the screen structure 12. The striking roller 35 is connected to the rotating shaft 33 through the connecting plate 34.

[0095] The compound fertilizer preparation equipment using lithium mica slag as raw material is mainly used for screening crushed lithium mica slag particles in S1, and can also be used for screening ground powder in S2. Of course, different screen structures 12 with different sieve holes are selected for particles of different sizes. One machine can be used to replace the screen structure 12 with different hole diameters, or two machines can be used, with each machine corresponding to a screen structure 12 with a different hole diameter.

[0096] In this embodiment, the conveying device 2 is a belt conveyor.

[0097] During screening, the material to be screened is fed onto the screen structure 12 using a feeding device. The driving device 14 drives the screen structure 12 to vibrate. The material that meets the particle size requirements falls through the screen structure 12 onto the conveying device 2 and is conveyed to the designated container. The material that does not meet the particle size requirements is discharged through the screen structure 12 to the other end.

[0098] After screening is completed, the slag particles that are blocked on the screen structure 12 are cleaned by the tapping device 3. Specifically, the tapping device 3 is moved to the blocked area by moving the sliding sleeve 31, and then the motor 32 drives the rotating shaft 33 to rotate. The rotating shaft 33 drives the tapping roller 35 to rotate through the connecting plate 34. The tapping roller 35 taps the bottom of the screen structure 12. The tapping vibration causes the particles stuck in the screen holes to pop out, thereby achieving the function of cleaning the screen structure 12.

[0099] The striking roller 35 includes a core shaft and a rubber roller section. The rubber roller section is sleeved and installed on the core shaft. One end of the connecting plate 34 passes through the rubber roller section and is connected to the core shaft. The rubber roller section strikes the screen structure 12, avoiding the use of hard materials that could easily deform the screen structure 12 during striking.

[0100] The screen structure 12 includes an installation frame and a screen plate. The screen plate is detachably installed in the installation frame. The screen plate has screen holes of corresponding diameter. The side guards of the installation frame, i.e. the guards on both sides of the screen plate, can limit the incoming material and prevent the material from moving out of the screen plate from both sides. One end of the installation frame is sealed and the other end is open. The open side is the discharge end, which is also the lower end of the entire screen structure 12.

[0101] The elastic structure 13 includes a spring and a guide shaft. The spring connects the support frame 11 and the fixed corner bracket on the mounting frame. Guide shafts are installed at the bottom of the fixed corner bracket and on the support frame 11. There is a movable gap between the two guide shafts. The spring is sleeved on the guide shaft, which can limit the direction of the spring's movement.

[0102] The drive unit 14 uses the principle of an eccentric vibrating screen and includes a drive motor, a vibrator, and an eccentric block. The vibrator is mounted on the support frame 11, and the output shaft of the drive motor is connected to the main shaft of the vibrator. The eccentric block is mounted on the main shaft. When the eccentric block rotates, it generates centrifugal inertial force, which is transmitted to the support frame 11 through the main shaft and the vibrator housing, causing the screen structure 12 to vibrate under the action of inertial force. Alternatively, a vibrating motor can be mounted above the screen structure 12 through a fixed frame, and the vibrating motor drives the screen structure 12 to vibrate for screening.

[0103] The conveying device 2 is arranged parallel to the screen structure 12. The two side plates 21 of the conveying device 2 are used to install rollers. The conveyor belt 22 is connected to the rollers. The conveying device 2 also includes a driving device for driving a roller to rotate, so as to realize the material conveying function of the conveyor belt 22.

[0104] The conveying direction of the conveying device 2 is from bottom to top, and a receiving container is placed at the discharge end of the conveyor belt 22 to receive the qualified material;

[0105] A slide rail is installed on one of the side plates 21, and a sliding sleeve 31 is fitted on the side plate 21 and slidably connected to the slide rail; preferably, a roller is provided inside the sliding sleeve 31 to reduce friction when moving along the slide rail and make the movement smoother.

[0106] Materials can be conveyed to the screen structure 12 using a screw conveyor or belt conveyor for screening.

[0107] Please see Figure 3In a preferred embodiment, the conveyor belt 22 of the conveying device 2 is provided with an assembly hole 221. The compound fertilizer preparation equipment using lithium mica slag as raw material also includes an assembly structure 5. The assembly structure 5 includes a driving component 51, a connecting frame 52, and an assembly shaft 53. The connecting frame 52 is slidably mounted on the sliding sleeve 31, and the assembly shaft 53 is mounted on the bottom of the connecting frame 52. The driving component 51 is used to drive the connecting frame 52 to rise or fall. Along the conveying direction of the conveyor belt 22, the assembly shaft 53 and the assembly hole 221 are located on the same plane.

[0108] By opening assembly holes 221 on the conveyor belt 22, after the material screening is completed, the position of the conveyor belt 22 is adjusted so that the assembly holes 221 are aligned with the assembly shaft 53. At this time, the drive component 51 drives the connecting frame 52 to descend, so that the assembly shaft 53 is inserted into the assembly hole 221. Subsequently, the conveyor belt 22 can be adjusted to drive the position of the striking device 3 to strike different positions of the screen structure 12 in sequence. The position adjustment of the striking device 3 is achieved by using the conveyor device 2.

[0109] In one embodiment, the assembly hole 221 of the conveyor belt 22 is aligned with the assembly shaft 53 when the conveyor belt 22 is not working. Each time the work stops, the conveyor belt 22 stops at the starting position. The specific settings are made according to the length of the conveyor belt 22 and the diameter of the drive roller and the driven roller. The conveyor belt 22 is sleeved on the drive roller and the driven roller. The drive roller is connected to the output end of the drive equipment. The diameter of the drive roller and the driven roller is the same.

[0110] In another embodiment, a photoelectric switch is provided, which is mounted on the side plate 21 by a fixing bracket. The detection end of the photoelectric switch faces the belt. When the assembly hole 221 on the conveyor belt 22 moves to align with the emitting end of the photoelectric switch, the light emitted by the emitting end passes through the assembly hole 221 and is received by the receiving end. At this time, the conveyor belt 22 stops, and the drive component 51 assembles the assembly shaft 53 with the assembly hole 221. A switch is provided. When cleaning blockages, the switch is turned on, and the photoelectric switch works. During screening and conveying, the photoelectric switch does not work.

[0111] Preferably, multiple assembly holes 221 and assembly shafts 53 are provided. In this embodiment, two assembly holes 221 and two assembly shafts 53 are provided.

[0112] The width of the conveyor belt 22 is wider than the screen surface width of the screen structure 12, so as to ensure that the conveyor belt 22 can fully receive the material screened by the screen structure 12; the assembly hole 221 is opened on the side of the conveyor belt 22, located outside the conventional screening surface of the screen structure 12, so as not to affect the material conveying function of the conveyor belt 22.

[0113] Preferably, multiple fan-shaped rubber sheets can be provided inside the assembly hole 221, and the multiple fan-shaped rubber sheets form a circle, which can further prevent material from entering the assembly hole 221; when the assembly shaft 53 is inserted into the assembly hole 221, the rubber sheets are squeezed out.

[0114] Please refer to it again. Figure 3 As a preferred embodiment of this example, the compound fertilizer preparation equipment using lithium mica slag as raw material further includes a receiving structure 4. The receiving structure 4 includes a mounting frame 41, a lifting cylinder 42, and a collecting hopper 43. The bottom end of the mounting frame 41 is installed on the sliding sleeve 31, the lifting cylinder 42 is installed on the top end of the mounting frame 41, and the collecting hopper 43 is suspended above the screen surface of the screen structure 12 and is detachably connected to the output end of the lifting cylinder 42.

[0115] When the bottom of the screen structure 12 is struck by the striking roller 35, the clogging particles in the screen structure 12 are knocked out of the screen holes by vibration. After the particles fall onto the screen structure 12, they are easy to fall back into the screen holes. Especially for the end that is far from the discharge end of the screen structure 12, it is not easy to discharge the clogging particles.

[0116] By setting up the receiving structure 4, when cleaning the clogged area of ​​the screen structure 12, the lifting cylinder 42 lowers the collecting hopper 43, so that the bottom of the collecting hopper 43 is in contact with the conveyor belt 22, such as... Figure 6 The collecting hopper 43 is located on one side of the bottom of the screen structure 12, where the striking roller 35 strikes. When the striking roller 35 strikes the bottom of the screen structure 12, the striking direction of the striking roller 35 is obliquely upward and the screen structure 12 is inclined. As a result, after the clogged particles are knocked out, they will bounce towards the collecting hopper 43 and fall into the collecting hopper 43. The particles collected inside the collecting hopper 43 can then be cleaned.

[0117] By detachably connecting the collection hopper 43 to the output end of the lifting cylinder 42, the collection hopper 43 can be disassembled and the particles collected inside can be cleaned.

[0118] In this embodiment, an internally threaded cylinder is rotatably installed inside the collecting hopper 43, and a threaded shaft is provided at the bottom end of the lifting cylinder 42. The collecting hopper 43 and the lifting cylinder 42 are detachably connected by the internally threaded cylinder and the threaded shaft. In other embodiments, a snap-fit ​​connector can be provided at the output end of the lifting cylinder 42, and a snap-fit ​​hole can be opened on the collecting hopper 43. The snap-fit ​​connector passes through the snap-fit ​​hole to achieve a detachable connection; an arc-shaped snap-fit ​​block is elastically connected to the snap-fit ​​connector.

[0119] Preferably, overlapping frames are provided at both ends of the collecting hopper 43. When the bottom of the collecting hopper 43 is in contact with the screen surface of the screen structure 12, the overlapping frames overlap on the side guard plates of the screen structure 12, thereby assisting in supporting the screen structure 12.

[0120] Please see Figure 3 and Figure 4 As an alternative embodiment, the drive component 51 includes a slide rod structure 511 and a drive arm 512. The slide rod structure 511 is mounted on the mounting bracket 41, and one end of the drive arm 512 is connected to the slide rod structure 511, while the other end is connected to the output end of the lifting cylinder 42.

[0121] When the assembly hole 221 is aligned with the assembly shaft 53, the lifting cylinder 42 lowers the collection bucket 43, simultaneously driving the drive arm 512 to follow. The drive arm 512 first slides down along the slide bar structure 511 to its maximum stroke, as... Figure 5 In step (a), the lifting cylinder 42 continues to push the collecting hopper 43 down until it is in contact with the screen surface of the screen structure 12. At this time, the drive arm 512 drives the mounting frame 41 to move down through the sliding rod structure 511. The mounting frame 41 drives the two assembly shafts 53 to descend and insert into the assembly hole 221 to achieve assembly. Figure 5 (b)

[0122] Thus, by using the lifting cylinder 42 to lower the collecting hopper 43 to fit the screen surface of the screen structure 12, the assembly shaft 53 is lowered and inserted into the assembly hole 221 to complete the assembly. In the process, the state of the conveying device 2 is switched from the material conveying state to the state of adjusting the position of the striking device 3.

[0123] The slide bar structure 511 includes two mounting plates and multiple slide bars. The two mounting plates are installed on the connecting frame 52 at intervals, and the multiple slide bars are installed between the two mounting plates at intervals. One end of the drive arm 512 is sleeved on the slide bar to form a sliding connection.

[0124] When the drive arm 512 slides down to be in contact with the mounting plate below, it has reached its maximum stroke. At this point, the drive arm 512 continues to move down, which in turn drives the entire connecting frame 52 to move down through the mounting plate.

[0125] As another optional embodiment, the drive component 51 includes a fixed frame and an electric push cylinder. The electric push cylinder is mounted on the mounting frame 41 through the fixed frame, and the output end of the electric push rod is connected to the connecting frame 52.

[0126] The lifting cylinder 42 can be an electric push cylinder, a hydraulic cylinder, or a pneumatic cylinder, etc.

[0127] Please see Figure 3 As an optional embodiment, a bushing is provided inside the assembly hole 221.

[0128] By setting a bushing inside the assembly hole 221, the strength of the assembly hole 221 can be strengthened, and the interaction between the assembly shaft 53 and the inner wall of the assembly hole 221 can be avoided, which would cause the assembly hole 221 to develop burrs or even tears.

[0129] The bushing is made of metal or plastic.

[0130] Please refer to it again. Figure 3 In a preferred embodiment, a connecting sleeve 311 is installed on the sliding sleeve 31, and the assembly shaft 53 passes through the connecting sleeve 311.

[0131] By setting a connecting sleeve 311, the assembly shaft 53 is inserted into the connecting sleeve 311. Thus, when the subsequent conveyor belt 22 drives the assembly shaft 53 to move through the assembly hole 221, the assembly shaft 53 can directly drive the sliding sleeve 31 to move through the connecting sleeve 311, making the movement of the sliding sleeve 31 more stable.

[0132] In this design, a slide rail is installed on the top of the sliding sleeve 31, and the bottom of the connecting frame 52 is fitted onto the slide rail to form a sliding assembly; alternatively, a slide rod can be installed on the top of the sliding sleeve 31, and the bottom of the connecting frame 52 can pass through the slide rod to form a sliding assembly.

[0133] The working principle of the compound fertilizer preparation equipment using lithium mica residue as raw material provided by this invention is as follows:

[0134] During screening, the material to be screened is fed onto the screen structure 12 using a feeding device. The driving device 14 drives the screen structure 12 to vibrate. The material that meets the particle size requirements falls through the screen structure 12 onto the conveying device 2 and is conveyed to the designated container. The material that does not meet the particle size requirements is discharged through the screen structure 12 to the other end.

[0135] After screening, the slag particles that clog the screen structure 12 are cleaned by the tapping device 3. Specifically, after screening the material, the position of the conveyor belt 22 is adjusted so that the assembly hole 221 is aligned with the assembly shaft 53.

[0136] The lifting cylinder 42 lowers the collection bucket 43, simultaneously driving the drive arm 512 to follow. The drive arm 512 first slides down along the slide bar structure 511 to its maximum stroke, such as... Figure 5 (a) Then, the lifting cylinder 42 continues to push the collecting hopper 43 down until it is in contact with the screen surface of the screen structure 12. At this time, the drive arm 512 drives the mounting frame 41 to move down through the sliding rod structure 511. The mounting frame 41 drives the two assembly shafts 53 to descend and insert into the assembly hole 221 to achieve assembly. Figure 5 (b); The conveyor belt 22 can be adjusted to drive the position of the striking device 3 to strike different positions of the screen structure 12 in sequence;

[0137] When the striking device 3 moves to the blockage area, the motor 32 drives the rotating shaft 33 to rotate. The rotating shaft 33 drives the striking roller 35 to rotate through the connecting plate 34. The striking roller 35 strikes the bottom of the screen structure 12. The striking vibration causes the particles stuck in the screen holes to pop out, thereby achieving the function of cleaning the screen structure 12.

[0138] Thus, by using the lifting cylinder 42 to lower the collecting hopper 43 to fit the screen surface of the screen structure 12, the assembly shaft 53 is lowered and inserted into the assembly hole 221 to complete the assembly. In the process, the state of the conveying device 2 is switched from the material conveying state to the state of adjusting the position of the striking device 3.

[0139] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A compound fertilizer preparation device using lithium mica slag as raw material, characterized in that, include: A screening assembly, comprising a support frame, a screen structure, a drive device, and multiple elastic structures, wherein the screen structure is obliquely connected to the support frame via multiple elastic structures, and the drive device is used to drive the screen structure to vibrate. A conveying device is mounted on the support frame and located below the screen structure; A striking device, comprising a sliding sleeve, a motor, a rotating shaft, a connecting plate, and a striking roller, wherein the sliding sleeve is slidably mounted on the side plate of the conveying device, the motor is horizontally mounted on the sliding sleeve, the rotating shaft is connected to the output shaft of the motor and located below the screen structure, and the striking roller is connected to the rotating shaft through the connecting plate; The conveyor belt of the conveying device is provided with assembly holes; An assembly structure is provided, comprising a drive component, a connecting frame, and an assembly shaft. The connecting frame is slidably mounted on the sliding sleeve, and the assembly shaft is mounted on the bottom of the connecting frame. The drive component is used to drive the connecting frame to rise or fall. Along the conveying direction of the conveyor belt, the assembly shaft and the assembly hole are located on the same plane. The receiving structure includes a mounting frame, a lifting cylinder, and a collecting hopper. The bottom end of the mounting frame is mounted on the sliding sleeve, the lifting cylinder is mounted on the top end of the mounting frame, and the collecting hopper is suspended above the screen surface of the screen structure and is detachably connected to the output end of the lifting cylinder.

2. The equipment for preparing compound fertilizer using lithium mica slag as raw material according to claim 1, characterized in that, The driving component includes a slide bar structure and a driving arm. The slide bar structure is mounted on the mounting frame. One end of the driving arm is connected to the slide bar structure, and the other end is connected to the output end of the lifting cylinder.

3. The equipment for preparing compound fertilizer using lithium mica slag as raw material according to claim 1, characterized in that, A bushing is provided inside the assembly hole.

4. The equipment for preparing compound fertilizer using lithium mica slag as raw material according to claim 1, characterized in that, A connecting sleeve is installed on the sliding sleeve, and the assembly shaft passes through the connecting sleeve.

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