Method for recovering nepheline in lithium feldspar tailings, molecular sieve preparation method and equipment

Abstract

The invention provides a method for recovering nepheline in lithium feldspar tailings and a molecular sieve preparation method and equipment, and relates to the field of tailings recovery. The method for recovering nepheline in the lithium feldspar tailings comprises the following steps: S11, grinding, screening and calcining the lithium feldspar tailings in sequence; and S12, slurrying the calcined material, dispersing the material through an ultrasonic separation system, then adding a flocculating agent, adding the mixed slurry into a flexible recovery system, adding a flotation reagent, agglomerating a hydrophilic material, and settling and separating a hydrophobic material. According to the method for recycling the nepheline in the lithium feldspar tailings and the molecular sieve preparation method, the nepheline in the lithium feldspar tailings is recycled through a soft natural stripping process, the extraction rate of the nepheline is increased, then the nepheline is further purified and treated, the nepheline forms molecular sieve crystal mush, and molecular sieve particles are obtained through the following steps of roasting and curing and the like. Therefore, full utilization of the lithium tailings is realized, and waste utilization is realized.

Description

Technical Field

[0001] This invention relates to the field of tailings recovery, and in particular to a method for recovering nepheline from lithium feldspar tailings, a method for preparing molecular sieves, and equipment. Background Technology

[0002] Lithium feldspar is named for its content of more than 7% potassium and sodium, as well as lithium. Phase analysis of lithium feldspar ore in the Yifeng section of the Jiuling Mountains has determined that the ore is mainly composed of granite pegmatite consisting of silicon dioxide, lepidolite, and sodium feldspar. The lithium feldspar tailings after refining also contain a certain amount of nepheline. However, the extraction efficiency of nepheline is low, so this low-grade lithium-containing feldspar ore can only be used in the glass and ceramics industry.

[0003] Type A molecular sieves, as advanced inorganic non-metallic materials, are mainly used for molecular-level selective adsorption, sieving, and ion exchange. They can also be used for environmental remediation and have mature applications in multiple environmental remediation fields such as water treatment, waste gas purification, and solid waste disposal. They can achieve precise capture and removal of pollutants. Nepheline is the main raw material for the preparation of type A molecular sieves. There is still room for improvement in how to extract nepheline from lithium feldspar tailings to prepare type A molecular sieves.

[0004] Therefore, it is necessary to provide a method for recovering nepheline from lithium feldspar tailings and a method for preparing molecular sieves to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method for recovering nepheline from lithium feldspar tailings, solving the problem of how to improve the extraction rate of nepheline from lithium feldspar tailings.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for recovering nepheline from lithium feldspar tailings, comprising the following steps:

[0007] S11. The lithium feldspar tailings are successively ground, screened and calcined.

[0008] S12. The calcined material is slurried and dispersed by an ultrasonic separation system, and then a flocculant is added;

[0009] S13. Add the mixed slurry to the flexible recovery system, add flotation reagents, hydrophilic materials agglomerate, hydrophobic materials settle and separate, and obtain nepheline after solid-liquid separation and drying of the material separated by flotation.

[0010] This invention provides a method for preparing molecular sieves, using the aforementioned method for recovering nepheline from lithium feldspar tailings, comprising the following steps:

[0011] S21. Nepheline is subjected to magnetic separation to remove iron, soaked and washed in dilute hydrochloric acid and dried in sequence. Then, nepheline is mixed with NaOH and alkali-fused at 200℃ for 2 hours. Then, water is added to dissolve and the mixture is filtered to obtain sodium aluminosilicate stock solution.

[0012] S22. Add reagents to the sodium aluminosilicate stock solution to adjust the molar ratio of SiO2 to Al2O3 to 1:1 and the molar ratio of Na2O to SiO2 to 2:1. Then add molecular sieve directing agent, transfer the synthesis mother liquor into the reaction vessel, and statically crystallize at 95℃ for 8-10 hours to form molecular sieve slurry.

[0013] S23. The molecular sieve slurry is filtered and washed until the pH of the washing liquid is ≤10. Then it is dried to obtain molecular sieve dry powder. The dry powder and binder are mixed, extruded and molded, and then calcined at 500℃ to obtain molded molecular sieve particles.

[0014] Preferably, the reagent added to the sodium aluminosilicate stock solution in step S4 is NaOH or sodium aluminate.

[0015] The present invention also provides a molecular sieve preparation apparatus for the aforementioned molecular sieve preparation method, comprising: a drying oven, wherein the inner wall of the drying oven is provided with a plurality of air inlets, each of the air inlets being connected to an air inlet channel;

[0016] Multiple material feeding boxes are spaced apart inside the drying oven. Each material feeding box includes a box body and a perforated plate. The box body is detachably installed in the drying oven. The perforated plate is installed on the box body and forms an air inlet cavity between the perforated plate and the box body. The air inlet cavity on each material feeding box is connected to each air inlet.

[0017] Multiple valves, each of which is used to block each of the air inlets;

[0018] Multiple protective covers, each of which is suspended above the material discharge box, each protective cover including a frame and a filter plate, the filter plate being mounted on top of the frame;

[0019] A lifting device, which is used to lift the protective cover.

[0020] Preferably, the valve includes a valve plate and a connecting block. The valve plate fits against the inner wall of the air inlet channel. One end of the connecting block is connected to the valve plate, and the other end passes through a sliding hole and is connected to the protective cover. A connecting hole is provided on the valve plate.

[0021] Preferably, the protective cover further includes a mounting block, which is installed on the frame. The lifting device includes a lifting cylinder and a driving rod. The lifting cylinder is installed on the top of the drying chamber, and the top end of the driving rod is installed at the output end of the lifting cylinder. The other end of the driving rod passes through multiple mounting blocks in sequence and is detachably connected to the mounting blocks. The protective cover is detachably connected to the drying chamber through a positioning element.

[0022] Preferably, the lifting device further includes multiple support plates and multiple positioning columns. The multiple support plates are installed at intervals on the drive rod, and each support plate is equipped with a positioning column. Each support plate is used to support each mounting block, and each mounting block is correspondingly sleeved on the positioning column on each support plate.

[0023] Preferably, the inner wall of the drying oven is provided with multiple positioning holes, and the positioning component includes a fixing block and a positioning pin. The fixing block is installed on the protective cover, and the positioning pin passes through the fixing block and is inserted into the positioning hole.

[0024] Preferably, the molecular sieve preparation equipment further includes a guide component, which is slidably installed inside the protective cover and is used to agitate the material inside the discharge box.

[0025] Preferably, the dredging component includes a driving component, a connecting rod, multiple connecting arms, and multiple dredging rods. The connecting rod connects to the multiple connecting arms, and multiple dredging rods are installed at the bottom end of each connecting arm. A dredging rope is connected between adjacent dredging rods. The connecting arms are slidably installed inside the protective cover, and the driving component is used to drive the connecting arms to move back and forth.

[0026] Preferably, the driving member is a second toothed plate, and one end of the connecting arm passes through the strip hole and is connected to the driving member. The lifting device also includes a plurality of first toothed plates, which are vertically installed on the support plate and perpendicular to the driving member. A plurality of gears are rotatably installed inside the drying box. When the lifting device drives the protective cover to cover the material box, one of the driving members and one of the first toothed plates mesh with the two ends of one of the gears respectively.

[0027] Compared with related technologies, the method for recovering nepheline from lithium feldspar tailings and the method for preparing molecular sieves provided by this invention have the following beneficial effects:

[0028] This invention provides a method for recovering nepheline from lithium feldspar tailings and a method for preparing molecular sieves. The method utilizes a soft natural exfoliation process to recover nepheline from lithium feldspar tailings, thereby increasing the extraction rate of nepheline. The nepheline in the lithium feldspar tailings is then further purified and processed to form molecular sieve slurry. Subsequent steps such as roasting and solidification yield molecular sieve particles, thus achieving full utilization of lithium tailings, realizing waste utilization, and reducing the site occupation of lithium tailings. Attached Figure Description

[0029] Figure 1 A flowchart illustrating the steps of the method for recovering nepheline from lithium feldspar tailings provided by the present invention.

[0030] Figure 2 This is a flowchart of the molecular sieve preparation method provided by the present invention;

[0031] Figure 3 A schematic diagram of the external structure of the molecular sieve preparation equipment provided by the present invention;

[0032] Figure 4 for Figure 3 The diagram shown is a structural schematic of the drying oven after the door has been removed.

[0033] Figure 5 A cross-sectional view of the drying oven provided by the present invention;

[0034] Figure 6 for Figure 5 The enlarged schematic diagram of part A shown below;

[0035] Figure 7 The rear view of the drying oven provided by the present invention after removing the back panel and side walls;

[0036] Figure 8 for Figure 7 The enlarged schematic diagram of section B is shown below;

[0037] Figure 9 A schematic diagram of the structure of the protective cover provided by the present invention;

[0038] Figure 10 This is a schematic diagram of the structure of the dredging component provided by the present invention;

[0039] Figure 11 A schematic diagram showing the protective cover of the present invention closed on the material feeding box;

[0040] Figure 12 This is a schematic diagram of the working state of the lifting device provided by the present invention, wherein, Figure 12 (a) is a schematic diagram showing the lifting device supporting the protective cover suspended above the material discharge box. Figure 12 (b) is a schematic diagram of the lifting device driving the protective cover on the material box. Figure 12(c) is a schematic diagram of the state of the first toothed plate driving the gear to rotate.

[0041] Numbering on the map:

[0042] 1. Drying oven; 11. Air inlet channel; 12. Air outlet channel; 13. Air vent; 14. Connection hole; 15. Positioning hole;

[0043] 2. Material feeding box; 21. Box body; 22. Perforated plate; 23. Air inlet cavity;

[0044] 3. Protective cover; 31. Enclosure frame; 32. Filter plate; 33. Mounting block;

[0045] 311. Slide rail; 312. Strip hole;

[0046] 4. Guiding component; 41. Driving component; 42. Connecting arm; 43. Connecting rod; 44. Guiding rod; 45. Guiding rope;

[0047] 5. Lifting device; 51. Lifting cylinder; 52. Drive rod; 53. First toothed plate; 54. Support plate; 55. Positioning column;

[0048] 6. Valve component; 61. Valve plate; 62. Connecting block; 611. Connecting hole;

[0049] 7. Gear; 71. Connecting shaft;

[0050] 30. Positioning component; 301. Fixing block; 302. Positioning pin;

[0051] 101. Support arm; 102. Air inlet; 103. Sliding hole;

[0052] 20. Fan; 40. Heating device. Detailed Implementation

[0053] 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.

[0054] This invention provides a method for recovering nepheline from lithium feldspar tailings.

[0055] Please see Figure 1 In one embodiment of the present invention, the method for recovering nepheline from lithium feldspar tailings includes the following steps:

[0056] S11. The lithium feldspar tailings are successively ground, screened and calcined.

[0057] S12. The calcined material is slurried and dispersed by an ultrasonic separation system, and then a flocculant is added;

[0058] S13. Add the mixed slurry to the flexible recovery system, add flotation reagents, hydrophilic materials agglomerate, hydrophobic materials settle and separate, and obtain nepheline after solid-liquid separation and drying of the material separated by flotation.

[0059] The extraction rate of nepheline is improved by recovering nepheline from lithium feldspar tailings using a soft natural stripping process.

[0060] In step S11, the mineral particles ground to about 95% have a diameter ≤45μm, and are sieved using an ultrasonic sieving system with a sieve aperture diameter of 45μm to separate the residual unselected lepidolite and a small amount of sericite from the tailings, and remove potassium; the calcination temperature in the calcination system is 900℃-920℃, which softens the feldspar minerals and makes them easier to separate from quartz.

[0061] The flexible recovery system includes a pre-mixed slurry tank, a reaction tank, a flexible flotation tank, and a concentrate concentration tank.

[0062] The pre-mixing tank is used to perform low-intensity mixing of the mixed slurry after crushing and grinding of lithium feldspar tailings, so as to make the slurry concentration uniform.

[0063] The reaction vessel is used to sequentially add flotation reagents for reaction.

[0064] Flexible flotation tanks use either aerated flotation cells or static flotation columns for flotation operations.

[0065] The concentrate thickener is used to introduce nepheline froth (containing a large amount of water) scraped from the flotation cell into the thickener. Low-intensity stirring (20-50 r / min) causes the nepheline particles to agglomerate and the water to slowly precipitate out, resulting in a nepheline concentrate slurry with a higher concentration.

[0066] The present invention also provides an apparatus for preparing molecular sieves.

[0067] Please see Figure 2 An apparatus for preparing molecular sieves includes the following steps:

[0068] S21. Nepheline is subjected to magnetic separation to remove iron, soaked and washed in dilute hydrochloric acid and dried in sequence. Then, nepheline is mixed with NaOH and alkali-fused at 200℃ for 2 hours. Then, water is added to dissolve and the mixture is filtered to obtain sodium aluminosilicate stock solution.

[0069] S22. Add reagents to the sodium aluminosilicate stock solution to adjust the molar ratio of SiO2 to Al2O3 to 1:1 and the molar ratio of Na2O to SiO2 to 2:1. Then add molecular sieve directing agent, transfer the synthesis mother liquor into the reaction vessel, and statically crystallize at 95℃ for 8-10 hours to form molecular sieve slurry.

[0070] S23. The molecular sieve slurry is filtered and washed until the pH of the washing liquid is ≤10. Then it is dried to obtain molecular sieve dry powder. The dry powder and binder are mixed, extruded and molded, and then calcined at 500℃ to obtain molded molecular sieve particles.

[0071] In this embodiment, the molecular sieve obtained is mainly type A molecular sieve. As an advanced inorganic non-metallic material, type A molecular sieve is mainly used for selective adsorption, sieving and ion exchange at the molecular level. It can also be used for environmental governance and has mature applications in multiple environmental governance fields such as water treatment, waste gas purification and solid waste disposal. It can achieve precise capture and removal of pollutants.

[0072] By recovering and processing nepheline from lithium feldspar tailings, and then further purifying and processing the nepheline to form molecular sieve slurry, molecular sieve particles are obtained through subsequent roasting and solidification steps. This achieves full utilization of lithium tailings, realizes waste utilization, and reduces the site occupation of lithium tailings.

[0073] In S1, wet strong magnetic separation (magnetic field strength 15000Gs) is preferred to remove iron and titanium impurities. Then, it is soaked in dilute hydrochloric acid (5% concentration) at room temperature for 2 hours, washed until neutral, and dried to obtain high-purity nepheline powder (particle size ≤200 mesh).

[0074] In this embodiment, the reagent added to the sodium aluminosilicate stock solution in step S4 is NaOH or sodium aluminate.

[0075] The present invention also provides an apparatus for preparing molecular sieves.

[0076] Please refer to the following: Figures 4 to 6 A molecular sieve preparation device, used in the molecular sieve preparation method, includes: a drying box 1, wherein the inner wall of the drying box 1 is provided with a plurality of air inlets 102, and each air inlet 102 is connected to an air inlet channel 11;

[0077] Multiple material feeding boxes 2 are spaced apart inside the drying chamber 1. Each material feeding box 2 includes a box body 21 and a perforated plate 22. The box body 21 is detachably installed on the drying chamber 1. The perforated plate 22 is installed on the box body 21 and forms an air inlet cavity 23 between the box body 21 and the perforated plate 22. The air inlet cavity 23 on each material feeding box 2 is connected to each air inlet 102.

[0078] Multiple valves 6, each of which is used to block each of the air inlets 102;

[0079] Multiple protective covers 3, each of the protective covers 3 is suspended above the material discharge box 2, and each protective cover 3 includes a frame 31 and a filter plate 32, the filter plate 32 being installed on the top of the frame 31;

[0080] Lifting device 5, which is used to lift the protective cover 3.

[0081] This drying oven 1 is mainly used to dry the molecular sieve slurry after filtration and washing in S23, and can also dry the nepheline particles in S13; it is mainly used in laboratories and other places to dry small amounts of materials.

[0082] The drying oven 1 is provided with multiple material feeding boxes 2, and in this embodiment there are three. The bottom side of one side of the material feeding box 2 and the corresponding air inlet 23 are open, so that the air inlet 23 can be connected to the air inlet 102.

[0083] like Figure 5 The drying oven 1 has a heating chamber inside, which is connected to the air inlet channel 11. A heating device 40 is installed in the heating chamber. A fan 20 is installed on one side of the drying oven 1. The fan blades of the fan 20 are located in the heating chamber. The fan 20 blows hot air to the air inlet channel 11.

[0084] The top of the inner wall of the drying chamber 1 is provided with an exhaust channel 12, and the exhaust channel 12 is connected to the interior of the drying chamber 1 through a connecting hole 14. One side of the exhaust channel 12 is connected to the outside through an exhaust port 13 to discharge the airflow after interacting with the material.

[0085] When using, depending on the amount of material to be dried, select one or more feeding boxes 2. When using, take out the feeding box 2, then spread the material flat inside the feeding box 2, and then push the feeding box 2 into the drying box 1. Before using the feeding box 2, lay a layer of filter cloth or similar material on the perforated plate 22 inside the feeding box 2 to receive the material.

[0086] According to the number of feeding boxes 2 used, open the corresponding valve 6 to connect the air inlet 102 with the air inlet chamber 23 of the corresponding feeding box 2. The heating device 40 and the fan 20 then work. Hot air enters the air inlet chamber 23 through the air inlet channel 11 and the air inlet 102. The hot air then blows upward through the perforated plate 22, acts on the material, and carries away the moisture on the material. The airflow then exits through the connection hole 14, the exhaust channel 12 and the exhaust port 13 in sequence.

[0087] During the material drying process, the protective cover 3 is lowered by the lifting device 5 so that it covers the material discharge box 2, thereby preventing finer materials from being blown away by the airflow and causing material loss. After drying, when the material is taken out, the protective cover 3 can be tapped so that the material attached to the protective cover 3 that rose with the airflow can fall into the material discharge box 2.

[0088] Therefore, in this embodiment, the drying box 1 can open only the corresponding air inlet 102 according to the number of material boxes 2 used, so that the air can directly enter the corresponding material box 2, while the other air inlets 102 are closed, thereby making full use of the hot airflow and reducing heat loss.

[0089] Furthermore, by setting up the protective cover 3, finer materials can be prevented from rising and being moved out with the airflow, thus avoiding material loss.

[0090] The protective cover 3 includes a filter plate 32 with a perforated top plate and a filter screen. The perforated top plate is installed on the top of the frame 31, and the filter screen covers the perforated top plate.

[0091] Among them, multiple support arms 101 are installed on both sides of the inner wall of the drying box 1. Two support arms 101 arranged symmetrically form a group. The support arms 101 are provided with sliding grooves. The bottom of the material box 2 is provided with protrusions on both sides. During installation, the protrusions slide into the sliding grooves to achieve assembly.

[0092] Preferably, the raised bottom is equipped with rollers to improve the smoothness of assembly.

[0093] Please see Figure 6 In this example, the valve 6 includes a valve plate 61 and a connecting block 62. The valve plate 61 fits against the inner wall of the air inlet channel 11. One end of the connecting block 62 is connected to the valve plate 61, and the other end passes through the sliding hole 103 and is connected to the protective cover 3. A connecting hole 611 is provided on the valve plate 61.

[0094] The valve plate 61 is connected to the protective cover 3 via the connecting block 62. When the lifting device 5 pushes the protective cover 3 down onto the discharge box 2, the protective cover 3 drives the valve plate 61 to move down via the connecting block 62, so that the connecting hole 611 is aligned with the air inlet 102, thereby connecting the air inlet channel 11 with the air inlet cavity 23 of the discharge box 2, so that the hot airflow enters the discharge box 2 to dry the material.

[0095] Therefore, there is no need to set up an additional drive device to control the opening and closing of the valve plate 61.

[0096] like Figure 11 At this time, the valve plate 61 moves down with the protective cover 3, so that the connecting hole 611 is aligned with the air inlet 102. At the same time, the upper end of the valve plate 61 blocks the sliding hole 103 to prevent airflow from being blown out through the sliding hole 103.

[0097] In other embodiments, valve 6 includes an electric push cylinder, a valve block, and a mounting bracket. The electric push cylinder is mounted on the drying chamber 1 via the mounting bracket. The output end of the electric push cylinder extends through the drying chamber 1 to the air inlet channel 11 and is connected to the valve block. The valve block is aligned with the sliding hole 103.

[0098] Please see Figures 7 to 9In this embodiment, the protective cover 3 further includes a mounting block 33, which is mounted on the frame 31. The lifting device 5 includes a lifting cylinder 51 and a driving rod 52. The lifting cylinder 51 is mounted on the top of the drying chamber 1, and the top end of the driving rod 52 is mounted on the output end of the lifting cylinder 51. The other end of the driving rod 52 passes through multiple mounting blocks 33 in sequence and is detachably connected to the mounting blocks 33. The protective cover 3 is detachably connected to the drying chamber 1 through a positioning member 30.

[0099] By detachably connecting the drive rod 52 to the mounting block 33 of the protective cover 3 in sequence, multiple protective covers 3 can be raised and lowered simultaneously using one lifting cylinder 51, reducing the use of drive equipment;

[0100] In this embodiment, the unused protective cover 3 can be detached from the mounting block 33 and the driving rod 52, and connected and limited to the drying box 1 by the positioning member 30;

[0101] In other embodiments, multiple lifting devices 5 may be provided, with the driving rod 52 of each lifting cylinder 51 connected to the mounting block 33 of each protective cover 3, thereby controlling the lifting and lowering of the protective cover 3 respectively.

[0102] The lifting cylinder 51 can be an electric push cylinder, a hydraulic cylinder, or a pneumatic cylinder, etc.

[0103] Please see Figure 8 As an optional embodiment, the lifting device 5 further includes multiple support plates 54 and multiple positioning columns 55. The multiple support plates 54 are spaced apart on the driving rod 52, and each support plate 54 is equipped with a positioning column 55. Each support plate 54 is used to support each mounting block 33, and each mounting block 33 is correspondingly sleeved on the positioning column 55 of each support plate 54.

[0104] By using the support plate 54 and positioning column 55 to support and limit the mounting block 33, that is, to support and limit the protective cover 3, when the protective cover 3 is raised, the lifting cylinder 51 lifts the driving rod 52, and the driving rod 52 drives the mounting block 33 to move upward through the support plate 54 and positioning column 55, thereby driving the protective cover 3 to move upward; when the protective cover 3 is lowered, the lifting cylinder 51 drives the support plate 54 and positioning column 55 to follow the downward through the driving rod 52, and at this time the protective cover 3 descends by gravity, thereby realizing the lifting and lowering of the protective cover 3;

[0105] Meanwhile, when the protective cover 3 is not in use, the protective cover 3 is limited to the drying box 1 by the positioning component 30. Thus, when the lifting cylinder 51 lowers the support plate 54 and the positioning column 55 by driving the rod 52, the support plate 54 and the positioning column 55 automatically connect with the mounting block 33 without the need for additional disassembly, simplifying the operation.

[0106] Each support plate 54 is equipped with multiple positioning posts 55. In this embodiment, each support plate 54 is equipped with four positioning posts 55.

[0107] The mounting block 33 and the frame 31 are preferably installed in a detachable manner, such as by bolts, so that the frame 31 and the mounting block 33 can be disassembled, making it easy to remove the main body of the protective cover 3 from the drying oven 1 for cleaning, etc.

[0108] As another optional method in this embodiment, multiple threaded holes can be opened on the driving rod 52, the mounting block 33 is sleeved on the driving rod 52, the threaded pin passes through the threaded hole and is threadedly connected to the threaded hole, and the mounting block 33 is supported by the threaded pin, that is, the protective cover 3 is supported.

[0109] Please see Figure 4 and Figure 5 As an optional embodiment, the inner wall of the drying oven 1 is provided with a plurality of positioning holes 15. The positioning component 30 includes a fixing block 301 and a positioning pin 302. The fixing block 301 is installed on the protective cover 3, and the positioning pin 302 passes through the fixing block 301 and is inserted into the positioning hole 15.

[0110] When using the protective cover 3, the positioning pin 302 is pulled out of the positioning hole 15, thereby releasing the vertical restriction of the protective cover 3, and the protective cover 3 can follow the lifting device 5 to rise and fall.

[0111] When it is not necessary to follow the lifting and lowering, the positioning pin 302 is inserted into the positioning hole 15 to limit the vertical movement of the protective cover 3. When the lifting cylinder 51 drives the support plate 54 to descend through the driving rod 52, the protective cover 3 will not follow the descent by gravity.

[0112] In this embodiment, a positioning element 30 is installed on both sides of each protective cover 3, and multiple positioning holes 15 are opened on both sides of the inner wall of the drying oven 1 corresponding to each protective cover 3.

[0113] The uppermost protective cover 3 may not have a positioning element 30, and the uppermost protective cover 3 is preferred to be used each time.

[0114] As another optional embodiment, the positioning member 30 includes a threaded pin and a fixing block 301, with a threaded hole in the fixing block 301, and the threaded pin is threadedly connected to the fixing block 301.

[0115] Please see Figure 5 As an optional embodiment, the molecular sieve preparation equipment further includes a guide member 4, which is slidably installed inside the protective cover 3 and is used to agitate the material inside the discharge box 2.

[0116] By setting the guide component 4 during the drying process, the material spread in the feeding box 2 can be guided and turned, so that the material can interact more evenly and fully with the hot airflow, thereby improving the drying effect and speed.

[0117] Please refer to the following: Figure 5 and Figure 10 As an optional embodiment, the dredging component 4 includes a driving component 41, a connecting rod 43, multiple connecting arms 42, and multiple dredging rods 44. The connecting rod 43 connects multiple connecting arms 42, and multiple dredging rods 44 are installed at the bottom end of each connecting arm 42. A dredging rope 45 is connected between adjacent dredging rods 44. The connecting arms 42 are slidably installed inside the protective cover 3, and the driving component 41 is used to drive the connecting arms 42 to move back and forth.

[0118] When the protective cover 3 is closed with the discharge box 2, the guide rod 44 is inserted into the material;

[0119] When the material is being guided and turned, the drive component 41 drives a connecting arm 42 to move back and forth. The connecting arm 42 drives multiple connecting arms 42 to move back and forth simultaneously through the connecting rod 43. The connecting arm 42 drives multiple guiding rods 44 to move back and forth, thus moving the material. At the same time, the guiding ropes 45 between adjacent guiding rods 44 also move the material, thereby guiding and turning the entire material, increasing the contact area between the material and the hot airflow, and improving the drying efficiency.

[0120] The bottom end of the guide rod 44 is conical (not shown in the figure), which makes it easy to insert into the material. When the protective cover 3 is on the material box 2, if it is not completely covered, the staff can help press down the protective cover 3 to ensure that the guide rod 44 enters the material.

[0121] Multiple guide ropes 45 are connected between adjacent guide rods 44 to improve the guide effect. The guide ropes 45 are made of high-temperature resistant silk or metal wire, such as stainless steel wire.

[0122] The inner walls of the protective cover 3 are equipped with slide rails 311 on both sides, and the two ends of the connecting arm 42 are respectively fitted onto the slide rails 311.

[0123] As an optional embodiment, the driving component 41 is an electric push cylinder, which is mounted on the protective cover 3, and the output end of the electric push cylinder is connected to a connecting arm 42.

[0124] Please see Figure 7 and Figure 8As another optional embodiment, the driving member 41 is a second toothed plate. One end of the connecting arm 42 passes through the strip hole 312 and is connected to the driving member 41. The lifting device 5 also includes a plurality of first toothed plates 53. The first toothed plates 53 are vertically installed on the support plate 54 and are perpendicular to the driving member 41. A plurality of gears 7 are rotatably installed inside the drying box 1. When the lifting device 5 drives the protective cover 3 to cover the material box 2, one of the driving members 41 and one of the first toothed plates 53 respectively mesh with the two ends of one of the gears 7.

[0125] When the protective cover 3 is placed on the material feeding box 2, the corresponding driving component 41 (second toothed plate) meshes with one end of the gear 7, while the first toothed plate 53 meshes with the other end of the gear 7. Figure 12 (b)

[0126] Then, the lifting cylinder 51 continues to drive the rod 52 to descend, the rod 52 drives the support plate 54 to descend, the support plate 54 drives the first toothed plate 53 to descend and interact with the gear 7, causing the gear 7 to rotate. The rotation of the gear 7 causes the driving component 41 (second toothed plate) to move horizontally, the driving component 41 (second toothed plate) drives a connecting arm 42 to move accordingly, the connecting rod 43 drives the adjacent connecting arm 42 to move, thereby driving the guide rod 44 to move and turn the material.

[0127] Subsequently, the lifting cylinder 51 reciprocates within the length range of the first toothed plate 53, thereby enabling the drive component 41 (second toothed plate) to move back and forth, and enabling the guide rod 44 to move back and forth to guide and move the material.

[0128] Thus, in one state, the lifting device 5 can drive the protective cover 3 to cover the material box 2, and in another state, it can drive the guide component 4 to work with a wire. In this process, it can also drive the valve component 6 to open or close the air inlet 102.

[0129] Among them, gear 7 is rotatably mounted on the back of the inner wall of drying oven 1 via connecting shaft 71.

[0130] The number of gears 7 and the first tooth plate 53 corresponds to the number of material boxes 2 inside the drying oven 1.

[0131] The drive component 41 (second toothed plate) and the first toothed plate 53 are staggered.

[0132] Please see Figure 3 The drying oven 1 is also equipped with a door on the outside and a temperature sensor inside to detect the internal temperature. The drying oven 1 also includes a control box (not shown) to control the opening and closing of the drying oven 1.

[0133] The working principle of the molecular sieve preparation equipment provided by this invention is as follows:

[0134] When using, depending on the amount of material to be dried, select one or more feeding boxes 2. When using, take out the feeding box 2, then spread the material flat inside the feeding box 2, and then push the feeding box 2 into the drying box 1. Before using the feeding box 2, lay a layer of filter cloth or similar material on the perforated plate 22 inside the feeding box 2 to receive the material.

[0135] According to the number of feeding boxes 2 used, open the corresponding valve 6 to connect the air inlet 102 with the air inlet chamber 23 of the corresponding feeding box 2. The heating device 40 and the fan 20 then work. Hot air enters the air inlet chamber 23 through the air inlet channel 11 and the air inlet 102. The hot air then blows upward through the perforated plate 22, acts on the material, and carries away the moisture on the material. The airflow then exits through the connection hole 14, the exhaust channel 12 and the exhaust port 13 in sequence.

[0136] During the material drying process, the protective cover 3 is lowered by the lifting device 5 so that it covers the material discharge box 2, thereby preventing finer materials from being blown away by the airflow and causing material loss. After drying, when the material is taken out, the protective cover 3 can be tapped so that the material attached to the protective cover 3 that rose with the airflow can fall into the material discharge box 2.

[0137] Therefore, in this embodiment, the drying box 1 can open only the corresponding air inlet 102 according to the number of material boxes 2 used, so that the air can directly enter the corresponding material box 2, while the other air inlets 102 are closed, thereby making full use of the hot airflow and reducing heat loss.

[0138] Furthermore, by setting the protective cover 3, finer materials can be prevented from rising and being moved out with the airflow, thus avoiding material damage.

[0139] When the lifting device 5 pushes down the protective cover 3 onto the discharge box 2, the protective cover 3 drives the valve plate 61 to move down through the connecting block 62, so that the connecting hole 611 is aligned with the air inlet 102, thereby connecting the air inlet channel 11 with the air inlet cavity 23 of the discharge box 2, so that the hot airflow enters the discharge box 2 to dry the material.

[0140] When the protective cover 3 is placed on the material feeding box 2, the corresponding driving component 41 (second toothed plate) meshes with one end of the gear 7, while the first toothed plate 53 meshes with the other end of the gear 7. Figure 12 (b)

[0141] Then, the lifting cylinder 51 continues to drive the rod 52 to descend, the rod 52 drives the support plate 54 to descend, the support plate 54 drives the first toothed plate 53 to descend and interact with the gear 7, causing the gear 7 to rotate. The rotation of the gear 7 causes the driving component 41 (second toothed plate) to move horizontally, the driving component 41 (second toothed plate) drives a connecting arm 42 to move accordingly, the connecting rod 43 drives the adjacent connecting arm 42 to move, thereby driving the guide rod 44 to move and turn the material.

[0142] Subsequently, the lifting cylinder 51 reciprocates within the length range of the first toothed plate 53, thereby enabling the drive component 41 (second toothed plate) to move back and forth, and enabling the guide rod 44 to move back and forth to guide and move the material.

[0143] Thus, in one state, the lifting device 5 can drive the protective cover 3 to cover the material box 2, and in another state, it can drive the guide component 4 to work with a wire. In this process, it can also drive the valve component 6 to open or close the air inlet 102.

[0144] 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 method for recovering nepheline from lithium feldspar tailings, characterized in that, Includes the following steps: S11. The lithium feldspar tailings are successively ground, screened and calcined. S12. The calcined material is slurried and dispersed by an ultrasonic separation system, and then a flocculant is added; S13. Add the mixed slurry to the flexible recovery system, add flotation reagents, hydrophilic materials agglomerate, hydrophobic materials settle and separate, and obtain nepheline after solid-liquid separation and drying of the material separated by flotation.

2. A method for preparing molecular sieves, characterized in that, Nepheline prepared using the method for recovering nepheline from lithium feldspar tailings as described in claim 1 includes the following steps: S21. Nepheline is subjected to magnetic separation to remove iron, soaked and washed in dilute hydrochloric acid and dried in sequence. Then, nepheline is mixed with NaOH and alkali-fused at 200℃ for 2 hours. Then, water is added to dissolve and the mixture is filtered to obtain sodium aluminosilicate stock solution. S22. Add reagents to the sodium aluminosilicate stock solution to adjust the molar ratio of SiO2 to Al2O3 to 1:1 and the molar ratio of Na2O to SiO2 to 2:

1. Then add molecular sieve directing agent, transfer the synthesis mother liquor into the reaction vessel, and statically crystallize at 95℃ for 8-10 hours to form molecular sieve slurry. S23. The molecular sieve slurry is filtered and washed until the pH of the washing liquid is ≤10. Then it is dried to obtain molecular sieve dry powder. The dry powder and binder are mixed, extruded and molded, and then calcined at 500℃ to obtain molded molecular sieve particles.

3. An apparatus for preparing molecular sieves, characterized in that, The method for preparing molecular sieves as described in claim 2 includes: a drying oven, wherein the inner wall of the drying oven is provided with a plurality of air inlets, each of the air inlets being connected to an air inlet channel; Multiple material feeding boxes are spaced apart inside the drying oven. Each material feeding box includes a box body and a perforated plate. The box body is detachably installed in the drying oven. The perforated plate is installed on the box body and forms an air inlet cavity between the perforated plate and the box body. The air inlet cavity on each material feeding box is connected to each air inlet. Multiple valves, each of which is used to block each of the air inlets; Multiple protective covers, each of which is suspended above the material discharge box, each protective cover including a frame and a filter plate, the filter plate being mounted on top of the frame; A lifting device, which is used to lift the protective cover.

4. The apparatus for preparing molecular sieves according to claim 3, characterized in that, The valve includes a valve plate and a connecting block. The valve plate fits against the inner wall of the air inlet channel. One end of the connecting block is connected to the valve plate, and the other end passes through a sliding hole and is connected to the protective cover. A connecting hole is provided on the valve plate.

5. The apparatus for preparing molecular sieves according to claim 3, characterized in that, The protective cover also includes a mounting block, which is installed on the frame. The lifting device includes a lifting cylinder and a driving rod. The lifting cylinder is installed on the top of the drying chamber, and the top end of the driving rod is installed at the output end of the lifting cylinder. The other end of the driving rod passes through multiple mounting blocks in sequence and is detachably connected to the mounting blocks. The protective cover is detachably connected to the drying chamber through a positioning component.

6. The apparatus for preparing molecular sieves according to claim 5, characterized in that, The lifting device also includes multiple support plates and multiple positioning columns. The multiple support plates are installed at intervals on the drive rod. Each support plate is equipped with a positioning column. Each support plate is used to support each mounting block, and each mounting block is correspondingly sleeved on the positioning column on each support plate.

7. The apparatus for preparing molecular sieves according to claim 6, characterized in that, The inner wall of the drying oven is provided with multiple positioning holes. The positioning component includes a fixing block and a positioning pin. The fixing block is installed on the protective cover, and the positioning pin passes through the fixing block and is inserted into the positioning hole.

8. The apparatus for preparing molecular sieves according to claim 6, characterized in that, The molecular sieve preparation equipment also includes a guide component, which is slidably installed inside the protective cover and is used to agitate the material inside the discharge box.

9. The apparatus for preparing molecular sieves according to claim 8, characterized in that, The dredging component includes a driving component, a connecting rod, multiple connecting arms, and multiple dredging rods. The connecting rod connects multiple connecting arms, and multiple dredging rods are installed at the bottom end of each connecting arm. A dredging rope is connected between adjacent dredging rods. The connecting arms are slidably installed inside the protective cover, and the driving component is used to drive the connecting arms to move back and forth.

10. The apparatus for preparing molecular sieves according to claim 9, characterized in that, The driving component is a second toothed plate. One end of the connecting arm passes through the strip hole and is connected to the driving component. The lifting device also includes multiple first toothed plates. The first toothed plates are vertically installed on the support plate and are perpendicular to the driving component. Multiple gears are rotatably installed inside the drying box. When the lifting device drives the protective cover to cover the material box, one of the driving components and one of the first toothed plates mesh with the two ends of one of the gears respectively.

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