Roller granulator suitable for lepidolite granulation
By introducing drip spray, mist spray and water-free compression zone into the drum granulator, combined with the screening zone, the problems of uneven particle size and low strength of lithium mica pellets are solved, and the particle size and strength are achieved The high preparation of lithium mica pellets has improved the effectiveness of lithium mica smelting and the application prospects of equipment.
Patent Information
- Application Number
- CN202421010153.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-10
AI Technical Summary
The existing roller granulators have problems with uneven particle size and low strength in lithium mica smelting, resulting in uneven kiln building and roasting, large powder yield and low leaching rate, which limits its application in the lithium smelting industry. .
A drum granulator including a drip spray area, a mist spray area, an unwatered pressing area and a screening area is designed to form a uniform parent core through a drip spraying mechanism and a mist spraying mechanism, and in the absence of The water-pressing zone enhances the strength of the pellets, and finally achieves lithium mica pellets with uniform particle size and high strength through the screening zone.
The preparation of lithium mica pellets with uniform particle size and controllable size and high strength is achieved, which solves the problems of uneven particle size and low strength of the pellets, improves resource utilization, meets the needs of lithium mica smelting, and promotes the rollers. The granulator is widely used in the lithium smelting industry.
Smart Images
Figure CN222240143U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of granulation equipment and relates to a drum granulator, in particular to a drum granulator suitable for lepidolite granulation. Background Art
[0002] Lepidolite is a layered ore with a monoclinic crystal system. It is one of the main mineral raw materials for extracting lithium. The existing mainstream lithium extraction process mainly feeds the mixture of raw materials and auxiliary materials into a rotary kiln for direct roasting, but there is a risk of kiln agglomeration, which is difficult to solve, resulting in great waste of resources and economic losses. Therefore, making raw materials and auxiliary materials into granules can effectively avoid the hidden danger of kiln agglomeration risk in rotary kilns.
[0003] Nowadays, drum granulator is widely used in fertilizer manufacturing, building materials industry and pharmaceutical manufacturing as an economical and practical granulation equipment. However, the existing drum granulator has the defect that the particle size of the pellets is different, and most of the pellets roll larger and larger in the barrel as the movement process, and the strength of the pellets formed by the rapid water supply and rolling of the drum is relatively low, which greatly limits the application of the drum granulator in the lithium smelting industry. For example, when using the drum granulator to prepare lithium mica particles, there are still shortcomings such as large and uneven particle size and low strength of the pellets. It is easy to have defects such as kiln formation, uneven roasting, large powder output and low subsequent leaching rate in the subsequent processing process, which affects the lithium mica smelting effect. Therefore, it is necessary to obtain a drum granulator that can prepare lithium mica pellets with uniform and controllable particle size and high strength, which is of great significance for meeting the important demand of the lithium mica smelting industry for granulation and promoting the widespread application of drum granulators in the lithium smelting industry. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a drum granulator with simple structure, convenient operation, uniform and easy-to-regulate particle size, high resource utilization rate and particles meeting smelting requirements in view of the deficiencies in the prior art.
[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions.
[0006] A drum granulator suitable for lepidolite granulation comprises a drum, wherein the drum is sequentially divided into a dripping water spraying area, a mist water spraying area, a waterless pressing area and a screening area along a material transmission direction; a dripping water spraying mechanism is arranged in the drum where the dripping water spraying area is located; and a mist water spraying mechanism is arranged in the drum where the mist water spraying area is located.
[0007] As a further improvement of the above technical solution: the length of the drip spray area is 1 / 6 of the total length of the drum; the length of the mist spray area is 1 / 6 of the total length of the drum; the length of the waterless pressing area is 1 / 5 of the total length of the drum.
[0008] As a further improvement of the above technical solution: the dripping spray mechanism includes a first water pipe, on which a plurality of dripping nozzles are arranged; the first water pipe is parallel to the axial direction of the drum; a first valve is provided at the water inlet end of the first water pipe; the first valve is a pneumatic valve; the outlet direction of the dripping nozzle is perpendicular to the axial direction of the drum.
[0009] As a further improvement of the above technical solution: the mist spray mechanism includes a second water pipe, on which a plurality of atomizing nozzles are arranged; the second water pipe is parallel to the axial direction of the drum; a second valve is provided at the water inlet end of the second water pipe; the second valve is a pneumatic valve; the atomizing nozzles are distributed on one of the left and right sides of the second water pipe; the angle between the outlet direction of the atomizing nozzle and the vertical direction is 10°~20°.
[0010] As a further improvement of the above technical solution: the screening zone includes a first screening zone and a second screening zone connected in sequence; the length of the first screening zone is 1 / 6 of the total length of the drum; the length of the second screening zone is 1 / 5 of the total length of the drum.
[0011] As a further improvement of the above technical solution: a plurality of first sieving holes are arranged on the wall of the drum where the first sieving area is located; a plurality of second sieving holes are arranged on the wall of the drum where the second sieving area is located; the aperture of the first sieving holes is smaller than the minimum particle size of the required lithium mica pellets; the particle size of the second sieving holes is larger than the maximum particle size of the required lithium mica pellets.
[0012] As a further improvement of the above technical solution: it also includes: a fine material collecting bin; the fine material collecting bin is located below the first screening area; the outlet of the fine material collecting bin is connected to the feed port of the drum through a belt conveyor.
[0013] As a further improvement of the above technical solution: it also includes: a lepidolite pellet collection bin and a coarse material collection bin; the lepidolite pellet collection bin is located below the second screening area; the coarse material collection bin is located below the drum discharge port.
[0014] As a further improvement of the above technical solution: it also includes: a silo for storing lithium mica powder; the discharge port of the silo is connected to the feed port of the drum.
[0015] As a further improvement of the above technical solution: the feed inlet of the silo is connected to the discharge port of the coarse material collecting silo; and a crusher is also provided between the feed inlet of the silo and the discharge port of the coarse material collecting silo.
[0016] As a further improvement of the above technical solution: it also includes: a driving mechanism for driving the roller to rotate, the driving mechanism includes a transmission motor, a main transmission wheel and a secondary transmission wheel; the roller is tiltedly mounted on the main transmission wheel and the secondary transmission wheel, the main transmission wheel is located in the middle of the roller, and the secondary transmission wheels are at least two groups, which are located at both ends of the roller; the feed port of the roller is higher than the discharge port; the transmission motor is connected to the main transmission wheel through a transmission shaft; the main transmission wheel drives the roller to rotate through gears.
[0017] As a further improvement of the above technical solution: it also includes: a support frame; the driving mechanism is installed on the support frame.
[0018] Compared with the prior art, the advantages of the utility model are:
[0019] (1) The utility model is applicable to a drum granulator for lepidolite granulation, comprising a drum, wherein the drum is sequentially divided into a dripping spray area, a mist water spray area, a waterless pressing area, and a screening area along the material transmission direction, wherein a dripping spray mechanism is provided in the drum where the dripping spray area is located, and a mist water spray mechanism is provided in the drum where the mist water spray area is located. In the utility model, the powder (such as lithium mica ore and auxiliary materials) in the silo enters the dripping spray area in the drum from the feed port, and under the action of the dripping spray mechanism, small water drops of uniform size are dripped into the powder, and these powders roll and nucleate after contacting the water drops to form mother nuclei with relatively uniform particle size. Further, as the drum rolls, these mother nuclei and part of the unnucleated powder enter the mist spray area, and under the action of the mist spray mechanism, uniform atomized water is sprayed onto the rolling mother nuclei, so that the mother nuclei are uniformly wetted by water. At this time, the wetted mother nuclei are bonded with the remaining unnucleated powder and gradually grow until the particle size required by the process is reached. Furthermore, these grown pellets enter the waterless compacting area as the drum rolls, and under the rolling action of the drum, the strength of the pellets gradually increases to form compact pellets with a certain strength. Finally, they are screened in the screening area to remove pellets whose particle size does not meet the requirements, so as to obtain lithium mica pellets with uniform and controllable particle size and high strength. The utility model drum granulator has the advantages of simple structure and convenient operation, can prepare lithium mica pellets that meet the requirements of lithium mica smelting, has high use value and good application prospect, and is of great significance for promoting the widespread application of drum granulators in the lithium smelting industry.
[0020] (2) In the drum granulator of the utility model, the screening zone includes a first screening zone and a second screening zone connected in sequence, a plurality of first screening holes are arranged on the drum wall where the first screening zone is located, and a plurality of second screening holes are arranged on the drum wall where the second screening zone is located, the aperture of the first screening hole is smaller than the minimum particle size of the desired lithium mica pellets, and the particle size of the second screening hole is larger than the maximum particle size of the desired lithium mica pellets. In the utility model, after the compacted pellets are formed and enter the first screening zone, the pellets with a particle size smaller than the target particle size range can be screened out under the screening action of the first screening holes, and these fine materials can be re-entered into the dripping spray zone in the drum as the mother nucleus, which can not only accelerate the growth rate of the pellets, but also quickly realize the recycling of raw materials. Furthermore, the pellets with a slightly larger particle size enter the second screening zone, and under the screening action of the second screening holes, the pellets with a particle size that meets the subsequent smelting requirements are collected. At the same time, the pellets with too large a particle size are discharged from the discharge port after passing through the second screening zone, and are further crushed and re-added to the drum for further granulation, thereby realizing the full recycling of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.
[0022] Figure 1 It is a structural schematic diagram of a drum granulator in an embodiment of the utility model.
[0023] Figure 2 It is a cross-sectional schematic diagram of a drum granulator in an embodiment of the utility model.
[0024] Figure 3 It is a structural schematic diagram of the spray area in the embodiment of the utility model.
[0025] Figure 4 It is a structural schematic diagram of the dripping spray area in the embodiment of the utility model.
[0026] Figure 5 It is a schematic diagram of the structure of the mist spray area in the embodiment of the utility model.
[0027] Figure 6 It is a schematic diagram of the structure of the screening area in the embodiment of the utility model.
[0028] Legend:
[0029] 1. Drum; 2. Drip spray area; 3. Mist spray area; 4. Waterless pressing area; 5. First screening area; 6. Second screening area; 7. Drip nozzle; 8. First valve; 9. Mist nozzle; 10. Second valve; 11. First screening hole; 12. Second screening hole; 13. Fine material collection bin; 14. Belt conveyor; 15. Lepidolite pellet collection bin; 16. Coarse material collection bin; 17. Material bin; 18. Transmission motor; 19. Main transmission wheel; 20. Secondary transmission wheel; 21. Support frame. DETAILED DESCRIPTION
[0030] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.
[0031] The materials and instruments used in the following examples are all commercially available.
[0032] Example:
[0033] like Figure 1 As shown, the drum granulator suitable for lepidolite granulation of the present embodiment comprises a drum 1, wherein the drum 1 is sequentially divided into a dripping spray area 2, a mist water spray area 3, a waterless pressing area 4, and a screening area along the material transmission direction, wherein a dripping spray mechanism is provided in the drum 1 where the dripping spray area 2 is located, and a mist water spray mechanism is provided in the drum 1 where the mist water spray area 3 is located.
[0034] like Figure 1 , Figure 2 As shown, in this embodiment, the length of the drip spray area 2 is 1 / 6 of the total length of the drum 1, the length of the mist spray area 3 is 1 / 6 of the total length of the drum 1, and the length of the waterless pressing area 4 is 1 / 5 of the total length of the drum 1.
[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, in this embodiment, the dripping spray mechanism includes a first water pipe, and the first water pipe is parallel to the axial direction of the drum 1; a plurality of dripping nozzles 7 are arranged on the first water pipe, and specifically, the number and nozzle diameter of the dripping nozzles 7 can be adjusted according to actual production needs. For example, 20 dripping nozzles 7 are connected in series on the first water pipe; the outlet direction of the dripping nozzle 7 is perpendicular to the axial direction of the drum 1, and specifically, the outlet direction of the dripping nozzle 7 is vertically downward. In this embodiment, the mother core rushes up to the cylinder wall with the movement of the drum and falls down under the action of gravity. The diameters of the mother cores are different, and the movement ranges of mother cores with different diameters in the cylinder wall are different. Therefore, it is necessary to control the outlet direction of the dripping nozzle 7 so that the dripping nozzle 7 sprays on the falling path of the mother core. In particular, the outlet direction of the dripping nozzle 7 is actually adjusted according to the target particle size of the mother core; a first valve 8 is provided at the water inlet end of the first water pipe, and specifically, the first valve 8 is a pneumatic valve. In this embodiment, the water in the water tank flows to the drip nozzle 7 through the first water pipe, and the size and speed of the water droplets are regulated by controlling the opening of the pneumatic valve, thereby regulating the particle size of the mother nucleus. For example, when the target particle size of the required pellets is 8mm to 12mm, the opening of the pneumatic valve is controlled to be 30%. At this time, the drip nozzle 7 sprays small water droplets of uniform size vertically downward. These small water droplets fall into the powder to form mother nuclei of relatively uniform size. The particle size of these mother nuclei is 5mm.
[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, in this embodiment, the mist spray mechanism includes a second water pipe, and the second water pipe is parallel to the axial direction of the drum 1; a plurality of atomizing nozzles 9 are arranged on the second water pipe. Specifically, the number, arrangement method, and nozzle diameter of the atomizing nozzles 9 can be adjusted according to actual production needs. For example, the number of atomizing nozzles 9 is 20, which are distributed on the right side of the second water pipe; the angle between the outlet direction of the atomizing nozzle 9 and the vertical direction is 10° to 20°. Specifically, the outlet direction is adjusted according to the actual rotation speed of the drum. For example, the atomizing nozzle 9 The angle between the outlet direction of the nozzle 9 and the vertical direction is 20°. In this embodiment, the spheres rush up the cylinder wall as the drum moves and then fall down due to gravity. The diameters of the resulting spheres are different, and the ranges of movement of spheres of different diameters in the cylinder wall are different. Therefore, it is necessary to control the outlet direction of the atomizing nozzle 9 so that the atomizing nozzle 9 sprays on the falling path of the spheres. In particular, the outlet direction of the atomizing nozzle 9 is actually adjusted according to the target particle size of the spheres. A second valve 10 is provided at the water inlet end of the second water pipe, and the second valve 10 is a pneumatic valve. In this embodiment, the water in the water tank flows to the atomizing nozzle 9 through the second water pipe, and the atomization effect of the water body is regulated by controlling the opening of the pneumatic valve, so that the water mist can be evenly sprayed onto the surface of the mother core. For example, by controlling the opening of the pneumatic valve to 50%, the atomizing nozzle 9 sprays dense and uniform atomized water downward, so that the mother core with a particle size of 5 mm is evenly wetted by the adapted dense atomized water. At this time, the wetted mother core is bonded with the remaining unnucleated powder and gradually grows until the target particle size required by the process is reached. Furthermore, these grown pellets (particle size is 8mm~12mm) enter the waterless compression zone as the drum rolls. Under the rolling action of the drum, the strength of the pellets gradually increases, forming compact pellets with a certain strength.
[0037] like Figure 1 and Figure 6 As shown, in this embodiment, the screening area includes a first screening area 5 and a second screening area 6 connected in sequence, wherein the length of the first screening area 5 is 1 / 6 of the total length of the drum 1, and the length of the second screening area 6 is 1 / 5 of the total length of the drum 1. That is, in this embodiment, the drum 1 is sequentially divided into a dripping spray area 2, a mist spray area 3, a waterless pressing area 4, a first screening area 5, and a second screening area 6 along the material transmission direction.
[0038] In this embodiment, a plurality of first sieving holes 11 are arranged on the wall of the drum 1 where the first sieving zone 5 is located. Specifically, the number, distribution mode and aperture size of these first sieving holes 11 can be adjusted according to actual production needs. For example, these first sieving holes 11 are evenly arranged on the wall of the drum 1, and the aperture is 7mm, so as to facilitate the preparation of pellets with a target particle size range of 8-12mm, and effectively separate fine materials and unused powders. A plurality of second sieving holes 12 are arranged on the wall of the drum 1 where the second sieving zone 6 is located. Specifically, the number, distribution mode and aperture size of these second sieving holes 12 can be adjusted according to actual production needs. For example, these second sieving holes 12 are evenly arranged on the wall of the drum 1, and the aperture is 13mm, so as to facilitate the preparation of pellets with a target particle size range of 8-12mm, and effectively separate coarse materials with a particle size greater than 12mm. In this embodiment, the aperture of the first sieve hole 11 is smaller than the minimum particle size of the desired lepidolite pellets, and the particle size of the second sieve hole 12 is larger than the maximum particle size of the desired lepidolite pellets.
[0039] like Figure 1 As shown, in this embodiment, it also includes: a fine material collecting bin 13, which is located below the first screening area 5. The outlet of the fine material collecting bin 13 is connected to the feed port of the drum 1 through a belt conveyor 14, so that the fine materials obtained after screening can be re-conveyed to the drum 1. These fine materials can re-enter the dripping spray area in the drum as mother nuclei, which can not only accelerate the growth rate of the pellets, but also quickly realize the reuse of raw materials.
[0040] like Figure 1 As shown, in this embodiment, it also includes: a lithium mica pellet collection bin 15 and a coarse material collection bin 16, wherein the lithium mica pellet collection bin 15 is located below the second screening area 6, and the lithium mica pellets are transported to the next process through the belt conveyor 14; the coarse material collection bin 16 is located below the discharge port of the drum 1.
[0041] like Figure 1 As shown, in this embodiment, it also includes: a silo 17 for storing lithium mica powder, which is located at the front end of the drum 1, wherein the discharge port of the silo 17 is connected to the feed port of the drum 1.
[0042] like Figure 1 As shown, the feed port of the silo 17 is connected to the discharge port of the coarse material collecting silo 16, and a crusher is also provided between the feed port of the silo 17 and the discharge port of the coarse material collecting silo 16. The material crushed by the crusher is transported to the silo 17 or to the drum 1 through the belt conveyor 14.
[0043] like Figure 1 and Figure 2As shown, in this embodiment, it also includes: a driving mechanism for driving the drum 1 to rotate, wherein the driving mechanism includes a transmission motor 18, a main transmission wheel 19 and a secondary transmission wheel 20, the drum 1 is tiltedly mounted on the main transmission wheel 19 and the secondary transmission wheel 20, the main transmission wheel 19 is located in the middle of the drum 1, and the secondary transmission wheels 20 are at least two groups, which are located at both ends of the drum 1; the feed port of the drum 1 is higher than the discharge port; the transmission motor 18 is connected to the main transmission wheel 19 through a transmission shaft; the main transmission wheel 19 drives the drum 1 to rotate through gears.
[0044] like Figure 1 As shown, in this embodiment, it also includes: a support frame 21, and a driving mechanism is installed on the support frame 21, specifically: a transmission motor 18, a main transmission wheel 19 and a secondary transmission wheel 20 are installed on the support frame 21.
[0045] Compared with conventional granulators, in the drum granulator of the utility model, the powder (such as lithium mica ore and auxiliary materials) in the silo enters the dripping spray area in the drum from the feed port. Under the action of the dripping spray mechanism, small water drops of uniform size fall into the powder. After contacting the water droplets, these powders roll and nucleate to form parent nuclei with relatively uniform particle size. Further, as the drum rolls, these parent nuclei and part of the unnucleated powder enter the mist spray area. Under the action of the mist spray mechanism, uniform atomized water is sprayed onto the drum. The moving mother nucleus is uniformly wetted with water. At this time, the wet mother nucleus is bonded with the remaining unnucleated powder and gradually grows until the particle size required by the process is reached. Furthermore, these grown pellets enter the waterless compaction zone as the roller rolls, and under the rolling action of the roller, the strength of the pellets gradually increases, forming compact pellets with a certain strength. Finally, the pellets are screened in the screening area to remove the pellets whose particle size does not meet the requirements, and obtain lithium mica pellets with uniform and controllable particle size and high strength. On this basis, by using the first screening holes and the second screening holes distributed in the screening area for screening, on the one hand, the pellets whose particle size does not meet the requirements can be removed, and on the other hand, all fine and coarse materials can be reused, thereby accelerating the growth rate of the pellets, and quickly preparing lithium mica pellets that meet the requirements of lithium mica smelting. The utility model drum granulator has the advantages of simple structure and convenient operation, and can prepare lithium mica pellets with uniform and controllable particle size and high strength. It is a new type of granulator, can be widely used in lithium mica granulation, has high use value and good application prospect, and is of great significance for promoting the widespread application of drum granulators in the lithium smelting industry.
[0046] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above in the preferred embodiment, it is not used to limit the utility model. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the methods and technical contents disclosed above without departing from the spirit and technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model, still fall within the scope of protection of the technical solution of the utility model.
Claims
1. A drum granulator suitable for lepidolite granulation, comprising a drum (1), characterized in that: The drum (1) is composed of a dripping water spraying area (2), a mist water spraying area (3), a waterless pressing area (4), and a screening area in sequence along the material transmission direction; a dripping water spraying mechanism is provided in the drum (1) where the dripping water spraying area (2) is located; and a mist water spraying mechanism is provided in the drum (1) where the mist water spraying area (3) is located.
2. The drum granulator applicable to lepidolite granulation according to claim 1, characterized in that, The length of the dripping water spraying area (2) is 1 / 6 of the total length of the drum (1); the length of the mist water spraying area (3) is 1 / 6 of the total length of the drum (1); and the length of the waterless pressing area (4) is 1 / 5 of the total length of the drum (1).
3. The drum granulator applicable to lepidolite granulation according to claim 2, characterized in that, The dripping spray mechanism comprises a first water pipe, on which a plurality of dripping nozzles (7) are arranged; the first water pipe is parallel to the axial direction of the drum (1); a first valve (8) is provided at the water inlet end of the first water pipe; the first valve (8) is a pneumatic valve; and the outlet direction of the dripping nozzle (7) is perpendicular to the axial direction of the drum (1).
4. The drum granulator applicable to lepidolite granulation according to claim 3, characterized in that, The mist spray mechanism comprises a second water pipe, on which a plurality of atomizing nozzles (9) are arranged; the second water pipe is parallel to the axis of the drum (1); a second valve (10) is arranged at the water inlet end of the second water pipe; the second valve (10) is a pneumatic valve; the atomizing nozzles (9) are distributed on one of the left and right sides of the second water pipe; and the angle between the outlet direction of the atomizing nozzles (9) and the vertical direction is 10° to 20°.
5. The drum granulator applicable to lepidolite granulation according to claim 2, characterized in that, The screening section comprises a first screening section (5) and a second screening section (6) which are connected in sequence; the length of the first screening section (5) is 1 / 6 of the total length of the drum (1); the length of the second screening section (6) is 1 / 5 of the total length of the drum (1); A plurality of first sieving holes (11) are arranged on the cylinder wall of the drum (1) where the first sieving section (5) is located; a plurality of second sieving holes (12) are arranged on the cylinder wall of the drum (1) where the second sieving section (6) is located; the aperture of the first sieving holes (11) is smaller than the minimum particle size of the desired lithium mica pellets; and the particle size of the second sieving holes (12) is larger than the maximum particle size of the desired lithium mica pellets.
6. The drum granulator suitable for lepidolite granulation according to claim 5, characterized in that, Also includes: A fine material collecting bin (13); the fine material collecting bin (13) is located below the first screening section (5); the outlet of the fine material collecting bin (13) is connected to the feed port of the drum (1) via a belt conveyor (14).
7. The drum granulator suitable for lepidolite granulation according to claim 6, characterized in that, Also includes: A lepidolite pellet collection bin (15) and a coarse material collection bin (16); the lepidolite pellet collection bin (15) is located below the second screening area (6); and the coarse material collection bin (16) is located below the discharge port of the drum (1).
8. The drum granulator suitable for lepidolite granulation according to claim 7, characterized in that, Also includes: A silo (17) for storing lepidolite powder; the discharge port of the silo (17) is connected to the feed port of the drum (1); The feed inlet of the silo (17) is connected to the discharge outlet of the coarse material collecting silo (16); a crusher is also provided between the feed inlet of the silo (17) and the discharge outlet of the coarse material collecting silo (16).
9. The drum granulator suitable for lepidolite granulation according to any one of claims 1 to 8, characterized in that: Also includes: A driving mechanism for driving a roller (1) to rotate, the driving mechanism comprising a transmission motor (18), a main transmission wheel (19) and a secondary transmission wheel (20); the roller (1) is tiltedly mounted on the main transmission wheel (19) and the secondary transmission wheel (20), the main transmission wheel (19) is located in the middle of the roller (1), and the secondary transmission wheels (20) are at least two groups, which are located at both ends of the roller (1); the feed port of the roller (1) is higher than the discharge port; the transmission motor (18) is connected to the main transmission wheel (19) via a transmission shaft; the main transmission wheel (19) drives the roller (1) to rotate via gears.
10. The drum granulator suitable for lepidolite granulation according to claim 9, characterized in that: Also includes: A support frame (21); the driving mechanism is mounted on the support frame (21).