A process for the production of graphene

Abstract

The application relates to the field of graphene production and discloses a graphene production process, which adopts an integrated crushing and screening device during crushing, the graphite powder after crushing is subjected to rotary screening through a rotating screen cylinder, the raw materials are fully rolled on the surface of the screen cylinder, the problem that the surface is prone to being blocked by the accumulated raw materials during transmission vibration screen plate screening is solved, the effective screening area is increased through rotary screening, and the screening efficiency is improved; meanwhile, a spraying cover arranged between the screen cylinder and an outer cylinder forms annular airflow outside the screen cylinder, the graphite powder is accelerated to be discharged from the screen cylinder, the outer wall of the screen cylinder and the inner wall of the outer cylinder are sprayed and cleaned, the residual graphite powder is reduced, and the yield of the graphite powder is improved; through the second air inlet pipe communicated with the feeding pipe and the scraper with the side spraying holes, the residual raw materials during feeding are reduced, the adhesion of the raw material powder to the equipment during discharging is reduced, and the graphite powder collecting effect is further improved.

Description

Technical Field

[0001] This invention relates to the field of graphene production, and more specifically, to a graphene production process. Background Technology

[0002] The redox process for producing graphene achieves large-scale preparation through chemical conversion. First, natural flake graphite is selected and pre-treated by drying. Then, it is intercalated with a strong oxidant to form graphene oxide. Next, graphene oxide dispersion is obtained by ultrasonic or chemical exfoliation. Finally, a reducing agent or high-temperature treatment is used to remove oxygen-containing groups and repair the conjugated structure to obtain graphene.

[0003] In the redox process for graphene production, the pretreatment of natural flake graphite involves three key steps: crushing, grading and screening, and drying. Traditional processes suffer from the following technical bottlenecks: First, crushing and screening require separate equipment, lacking coordination between the devices. Second, conventional screening devices often employ vibrating screens, which, with continuous operation, gradually accumulate large, incompletely crushed graphite particles on the screen surface. These retained particles not only cause screen blockage but also lead to a gradual decrease in the effective screening area. To maintain production continuity, operators must frequently stop the machine for manual cleaning and re-feed the retained large particles into the crushing system. This discontinuous operation significantly increases process complexity and labor costs, becoming a key technical obstacle to improving production efficiency. Summary of the Invention

[0004] Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a graphene production process that can realize continuous screening by a screening device.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A graphene production process includes the following steps:

[0008] Step 1, Pretreatment: The natural flake graphite is crushed, screened and dried to obtain pretreated graphite powder;

[0009] Step 2, oxidation; pretreated graphite powder is added to a reaction vessel along with a strong acid mixture and an oxidizing agent to carry out the oxidation reaction;

[0010] Step 3, peeling; The graphite oxide is put into an ultrasonic cleaner and deionized water solvent is added to perform the peeling operation to obtain the oxide slurry.

[0011] Step 4, reduction; the oxidized slurry and reducing agent are added to a hydrothermal reactor to carry out a reduction reaction and obtain graphene;

[0012] In step one, an integrated crushing and screening device is used when crushing and screening natural flake graphite. The integrated crushing and screening device includes an outer cylinder fixedly connected to a base, a fixed cylinder fixedly connected to the center of the outer cylinder, a crushing channel penetrating through itself in the fixed cylinder, a crushing blade roller connected to a second motor in the crushing channel, a feed pipe extending to the outside of the outer cylinder fixedly connected to the crushing channel, a feeding hopper fixedly connected to the outer end of the feed pipe, and a spiral conveying roller connected to a first motor inside the feed pipe.

[0013] The outer cylinder is rotatably connected to the screen cylinder outside the fixed cylinder, and the screen cylinder is connected to a third motor that drives its rotation; the inner side of the screen cylinder is fixedly connected to a scraper that slides against the fixed cylinder, and the upper opening of the crushing channel is located at the upper end of the fixed cylinder; an annular gap is formed between the screen cylinder and the outer cylinder, and a discharge hood that is tangentially connected to the lower part of the outer cylinder is fixedly connected to it. A blower hood that slides against the screen cylinder is fixedly connected to the side of the annular gap near the discharge hood, and the blower hood is connected to the air supply mechanism.

[0014] As a further aspect of the present invention: the air supply mechanism includes a discharge pipe fixedly connected to the discharge hood, a cyclone settling cylinder fixedly connected to the outer end of the discharge pipe, a central exhaust pipe fixedly connected to the center of the cyclone settling cylinder, a blower fixedly connected to the upper end of the central exhaust pipe, and a blower fixedly connected inside the blower; an air inlet main pipe fixedly connected to the air outlet end of the blower, and the air inlet main pipe connected to the spray hood through a first air inlet pipe.

[0015] As a further embodiment of the present invention: a material discharge hood is fixedly connected to the inner side of the upper end of the crushing channel, the lower part of the material discharge hood is a conical cylindrical structure with an open lower end, and the feed pipe is arranged opposite to the outer wall of the material discharge hood; a second air inlet pipe is fixedly connected to the outer end of the feed pipe, and the second air inlet pipe is fixedly connected to the main air inlet pipe; a first electromagnetic flow valve is fixedly connected at the connection between the first air inlet pipe and the main air inlet pipe, and a second electromagnetic flow valve is fixedly connected at the connection between the second air inlet pipe and the main air inlet pipe, and both the first electromagnetic flow valve and the second electromagnetic flow valve are electrically connected to the same controller.

[0016] As a further aspect of the present invention: a side channel and a side spray hole communicating with the side channel are provided inside the scraper. The airflow sprayed by the side spray hole is used to spray the outer wall of the fixed cylinder and the inner wall of the outer cylinder. A connecting channel communicating with the side channel is provided inside the screen cylinder. A rotating ring is fixedly connected to the side wall of the screen cylinder. The rotating ring is rotatably nested inside the outer cylinder shell wall. An annular air cavity for the rotating ring to rotate is provided in the outer cylinder. A third air inlet pipe is fixedly connected to the annular air cavity. The third air inlet pipe is fixedly connected to the main air inlet pipe.

[0017] As a further aspect of the present invention: the sieve cylinder is a cylindrical structure with openings at both ends, and its circumferential sidewalls are provided with uniformly distributed sieve holes; a toothed ring is fixedly connected to the sidewalls of the sieve cylinder and is rotatably nested in the outer cylinder shell; the output shaft of the third motor is fixedly connected to a drive gear that is rotatably nested in the outer cylinder shell, and the drive gear meshes with the toothed ring.

[0018] As a further aspect of the present invention: the number of crushing rollers is not less than two, the crushing rollers extend to the outside of the outer cylinder and adjacent crushing rollers are meshed by transmission gears, and one of the crushing rollers is connected to the output shaft of the second motor through a coupling.

[0019] As a further aspect of the present invention: the lower opening of the crushing channel is located at the lower part of the fixed cylinder, the blow hood is a long strip structure with a fan-shaped cross-section, and the blow hood has linearly equidistant longitudinal blow holes.

[0020] As a further aspect of the present invention: a third electromagnetic flow valve is fixedly connected at the connection between the third intake pipe and the main intake pipe, and the third electromagnetic flow valve is electrically connected to the controller.

[0021] As a further aspect of the present invention: an ionizer is fixedly connected inside the blower, which is used to ionize the circulating airflow to generate ion wind.

[0022] Compared with the prior art, the advantages of this invention are:

[0023] (1) The present invention uses a rotating screen cylinder to rotate and screen the pulverized graphite powder, so that the raw material rolls fully on the surface of the screen cylinder, which overcomes the problem of easy accumulation of raw material on the surface and blockage caused by the transmission vibration screen plate. In addition, the rotating screen increases the effective screening area and improves the screening efficiency.

[0024] (2) The present invention forms an annular airflow on the outside of the sieve cylinder by setting a blower between the sieve cylinder and the outer cylinder, which accelerates the discharge of graphite powder from the sieve cylinder and cleans the graphite powder adhering to the outer wall of the sieve cylinder and the inner wall of the outer cylinder by blowing, thereby reducing the graphite powder residue and improving the graphite powder yield.

[0025] (3) The present invention reduces the residue of raw materials during feeding by using a second air inlet pipe connected to the feed pipe and a material drop cover set at the top of the crushing channel, and generates swirling flow in the crushing channel to improve the uniformity of contact between the raw materials and the crushing rollers and improve the crushing efficiency; in addition, the airflow entering the crushing channel blows the crushing rollers, the inner wall of the crushing channel and the inner wall of the screen cylinder to further improve the cleaning effect of the adhering powder.

[0026] (4) The present invention improves the yield of graphite powder by blowing air through the side blowing holes set on the scraper to blow air onto the outer wall of the fixed cylinder, the inner wall of the material discharge hood and the inner wall of the outer cylinder. Attached Figure Description

[0027] Figure 1 This is a process flow diagram of the present invention;

[0028] Figure 2 This is a three-dimensional structural diagram of the integrated crushing and screening device in this invention;

[0029] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the outer cylinder in this invention;

[0030] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0031] Figure 5 This is a schematic diagram of the internal structure of the integrated crushing and screening device in this invention;

[0032] Figure 6 This is a schematic diagram of the assembly structure of the fixed cylinder in this invention;

[0033] Figure 7 This is a schematic diagram of the assembly structure of the sieve cylinder in this invention;

[0034] Figure 8 This is a three-dimensional structural diagram of the blow hood in this invention;

[0035] Figure 9 This is a schematic diagram of the pipe connection of the blower in this invention;

[0036] Figure 10 This is a schematic diagram of the flow of airflow and graphite powder.

[0037] Figure 11 This is a schematic diagram illustrating the cyclic feeding of substandard graphite particles using a scraper.

[0038] Figure 12 for Figure 3 Enlarged structural diagram at point B;

[0039] Figure 13 This is a three-dimensional structural diagram of the scraper in this invention;

[0040] Figure 14 This is a schematic diagram of the internal structure of the scraper in this invention.

[0041] Explanation of the numbers in the diagram: 1. Outer cylinder; 101. Annular air chamber; 2. Fixed cylinder; 201. Crushing channel; 3. Feed pipe; 4. Feed hopper; 5. Screw conveyor roller; 6. First motor; 7. Crushing blade roller; 8. Second motor; 9. Material discharge hood; 10. Screen cylinder; 1001. Connecting channel; 11. Scraper; 1101. Side channel; 1102. Side spray hole; 12. Gear ring; 13. Drive gear; 14. Third motor 15. Discharge hood; 16. Discharge pipe; 17. Cyclone settling cylinder; 18. Central exhaust pipe; 19. Blower; 20. Fan; 21. Ionizer; 22. Main air inlet pipe; 23. Pulse hood; 2301. Longitudinal pulse hole; 24. First air inlet pipe; 25. First electromagnetic flow valve; 26. Second air inlet pipe; 27. Second electromagnetic flow valve; 28. Rotating ring; 29. ​​Third air inlet pipe; 30. Third electromagnetic flow valve. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Please see Figure 1-11 In one embodiment of the present invention, a graphene production process includes the following steps:

[0046] Step 1, Pretreatment: The natural flake graphite is crushed, screened and dried to obtain pretreated graphite powder;

[0047] Step 2, oxidation; pretreated graphite powder is added to a reaction vessel along with a strong acid mixture and an oxidizing agent to carry out the oxidation reaction;

[0048] Specifically, the strong acid mixture is a mixture of concentrated sulfuric acid and fuming nitric acid in a volume ratio of nine to one, and the oxidant is potassium permanganate, to obtain graphite oxide;

[0049] Step 3, peeling; The graphite oxide is put into an ultrasonic cleaner and deionized water solvent is added to perform the peeling operation to obtain the oxide slurry.

[0050] Step 4, reduction; the oxidized slurry and reducing agent are added to a hydrothermal reactor to carry out a reduction reaction and obtain graphene;

[0051] Please see Figure 3 In step one, an integrated crushing and screening device is used when crushing and screening natural flake graphite. The integrated crushing and screening device includes an outer cylinder 1 fixedly connected to a base, a fixed cylinder 2 fixedly connected to the center of the outer cylinder 1, a crushing channel 201 that runs through the fixed cylinder 2, a crushing roller 7 connected to a second motor 8 in the crushing channel 201, a feed pipe 3 extending to the outside of the outer cylinder 1 fixedly connected to the feed pipe 3, a feeding hopper 4 fixedly connected to the outer end of the feed pipe 3, and a spiral conveying roller 5 connected to a first motor 6 inside the feed pipe 3.

[0052] Please see Figure 3 and Figure 4 The outer cylinder 1 is rotatably connected to the screen cylinder 10 outside the fixed cylinder 2. The screen cylinder 10 is connected to a third motor 14 that drives its rotation. The inner side of the screen cylinder 10 is fixedly connected to a scraper 11 that slides against the fixed cylinder 2. The upper opening of the crushing channel 201 is located at the upper end of the fixed cylinder 2. When the screen cylinder 10 drives the scraper 11 to make a circular motion, it rotates and screens the graphite powder falling into the screen cylinder 10. At the same time, in cooperation with the scraper 11, the unqualified large particles intercepted by the screen cylinder 10 are pushed to the top of the fixed cylinder 2 and fall into the crushing channel 201 for further crushing. An annular gap is formed between the screen cylinder 10 and the outer cylinder 1. The lower part of the outer cylinder 1 is fixedly connected to a discharge hood 15 that is tangentially connected to it. The side of the annular gap near the discharge hood 15 is fixedly connected to a spray hood 23 that slides against the screen cylinder 10. The spray hood 23 is connected to the air supply mechanism.

[0053] Specifically, during the crushing and screening of natural flake graphite, firstly, the material is fed through the feeding hopper 4, and the spiral conveying roller 5 of the feed pipe 3 injects the raw material into the crushing channel 201 of the fixed cylinder 2. After the crushing roller 7 crushes the raw material, the crushed raw material falls into the screen cylinder 10 along the crushing channel 201. Secondly, the rotating screen cylinder 10 drives the crushed raw material to rotate, and performs rotational screening. The screened raw material enters the annular gap and is discharged from the discharge hood 15. The large particles of raw material that are intercepted are pushed back into the crushing channel 201 by the scraper 11 for recycling and crushing. Thirdly, the external air supply mechanism injects airflow into the spray hood 23, and then sprays air from the spray hood 23 to spray the annular gap, so that an annular airflow is formed between the screen cylinder 10 and the outer cylinder 1, which accelerates the spraying out of the screened raw material and reduces the adhesion of the raw material to the outer cylinder 1 and the outer wall of the screen cylinder 10.

[0054] Compared to traditional graphite pretreatment devices, this invention features a rotating screen cylinder 10 that allows for the rotational screening of pulverized graphite powder. This ensures the raw material rolls fully on the surface of the screen cylinder 10, overcoming the problem of material accumulation and blockage that occurs when screening with a vibrating screen plate. Furthermore, the rotational screening increases the effective screening area and improves screening efficiency. Simultaneously, a blower hood 23 positioned between the screen cylinder 10 and the outer cylinder 1 creates an annular airflow outside the screen cylinder 10, accelerating the discharge of graphite powder from the screen cylinder 10 and cleaning the powder adhering to the outer wall of the screen cylinder 10 and the inner wall of the outer cylinder 1, reducing graphite powder residue and increasing the graphite powder yield.

[0055] Please see Figure 4 and Figure 7 The sieve cylinder 10 is a cylindrical structure with openings at both ends, and its circumferential sidewalls are provided with evenly distributed sieve holes; a toothed ring 12 is fixedly connected to the sidewall of the sieve cylinder 10 and is rotatably nested in the outer cylinder 1 shell wall; the output shaft of the third motor 14 is fixedly connected to a drive gear 13 that is rotatably nested in the outer cylinder 1 shell wall, and the drive gear 13 meshes with the toothed ring 12.

[0056] Specifically, the third motor 14 drives the drive gear 13 to rotate, and the drive gear 13 drives the gear ring 12 to rotate.

[0057] Please see Figure 6 There are at least two crushing rollers 7. The crushing rollers 7 extend to the outside of the outer cylinder 1 and adjacent crushing rollers 7 are meshed by transmission gears. One of the crushing rollers 7 is connected to the output shaft of the second motor 8 through a coupling.

[0058] Specifically, the second motor 8 drives one of the crushing rollers 7 to rotate via a coupling. This crushing roller 7 drives the other crushing rollers 7 to rotate via a transmission gear, thereby crushing the raw materials that fall into the crushing channel 201.

[0059] Please see Figure 5 and Figure 8 The lower opening of the crushing channel 201 is located at the lower part of the fixed cylinder 2. The blow hood 23 is a long strip structure with a fan-shaped cross section. The blow hood 23 has longitudinal blow holes 2301 that are linearly and equally distributed.

[0060] Specifically, the pulverized graphite powder is allowed to fall naturally into the sieve cylinder 10.

[0061] Please see Figure 5 The air supply mechanism includes a discharge pipe 16 fixedly connected to the discharge hood 15. The outer end of the discharge pipe 16 is fixedly connected to a cyclone settling cylinder 17. The center position of the cyclone settling cylinder 17 is fixedly connected to a central exhaust pipe 18. The upper end of the central exhaust pipe 18 is fixedly connected to a blower 19. A blower 20 is fixedly connected inside the blower 19. The air outlet end of the blower 19 is fixedly connected to an air inlet main pipe 22. The air inlet main pipe 22 is connected to the spray hood 23 through a first air inlet pipe 24.

[0062] Specifically, through the blower 19, airflow flows from the outer cylinder 1 into the cyclone settling cylinder 17, where graphite powder settles, thereby achieving the collection of graphite powder. The settled airflow then re-enters the blower hood 23 through the blower 19 and is then ejected from the blower hood 23, achieving internal airflow circulation and accelerating the settling and collection of graphite powder.

[0063] In another embodiment of the invention, please refer to Figure 2 and Figure 9 A material discharge hood 9 is fixedly connected to the inner side of the upper end of the crushing channel 201. The lower part of the material discharge hood 9 is a conical cylindrical structure with an open lower end. The feed pipe 3 is arranged opposite to the outer wall of the material discharge hood 9. A second air inlet pipe 26 is fixedly connected to the outer end of the feed pipe 3. The second air inlet pipe 26 is fixedly connected to the main air inlet pipe 22. A first electromagnetic flow valve 25 is fixedly connected at the connection between the first air inlet pipe 24 and the main air inlet pipe 22. A second electromagnetic flow valve 27 is fixedly connected at the connection between the second air inlet pipe 26 and the main air inlet pipe 22. The first electromagnetic flow valve 25 and the second electromagnetic flow valve 27 are both electrically connected to the same controller.

[0064] Specifically, by providing a second air inlet pipe 26, airflow is injected into the crushing channel 201 through the feed pipe 3, spraying the feed pipe 3 and the crushing channel 201 to reduce graphite powder residue. At the same time, the airflow flows along the crushing channel 201 to spray the crushing roller 7, thereby cleaning the crushing roller 7 and improving its service life. In addition, the feed pipe 3 is opposite to the outer wall of the discharge hood 9, so that the airflow forms a swirling flow in the crushing channel 201, so that the raw material is evenly distributed on the crushing roller 7, improving crushing efficiency and the uniformity of airflow spraying, thus improving the spraying cleaning effect. Furthermore, the airflow discharged through the crushing channel 201 sprays and cleans the screen holes of the screen cylinder 10, reducing the efficiency of screen hole clogging.

[0065] It should be noted that by providing the first electromagnetic flow valve 25 and the second electromagnetic flow valve 27, the air flow rate injected into the screen cylinder 10 is greater than the air flow rate injected into the annular gap. This allows the airflow to enter the annular gap from the screen cylinder 10 through the screen holes, which is consistent with the screening and discharge direction of the graphite powder, thereby further improving the screening efficiency and reducing the probability of screen hole blockage.

[0066] Please see Figure 12-14 The scraper 11 has a side channel 1101 and a side spray hole 1102 connected to the side channel 1101. The airflow sprayed by the side spray hole 1102 is used to spray the outer wall of the fixed cylinder 2 and the inner wall of the outer cylinder 1. The screen cylinder 10 has a connecting channel 1001 connected to the side channel 1101. A rotating ring 28 is fixedly connected to the side wall of the screen cylinder 10. The rotating ring 28 is rotatably nested in the shell wall of the outer cylinder 1. The outer cylinder 1 has an annular air chamber 101 for the rotating ring 28 to rotate. The annular air chamber 101 is fixedly connected to a third air inlet pipe 29. The third air inlet pipe 29 is fixedly connected to the main air inlet pipe 22.

[0067] Specifically, by injecting airflow into the side channel 1101 inside the scraper 11, the airflow is ejected through the side spray hole 1102 to spray and clean the outer wall of the fixed cylinder 2, the inner wall of the material discharge hood 9, and the inner wall of the outer cylinder 1, thereby further improving the spray cleaning effect on sticky graphite powder.

[0068] Please see Figure 2 A third electromagnetic flow valve 30 is fixedly connected at the connection between the third intake pipe 29 and the main intake pipe 22, and the third electromagnetic flow valve 30 is electrically connected to the controller.

[0069] Specifically, after the main raw materials are crushed and screened, the third electromagnetic flow valve 30 is activated to inject airflow into the scraper 11, and then a jet cleaning operation is carried out to reduce the mutual interference of airflow in the screen cylinder 10.

[0070] Please see Figure 5 An ionizer 21 is fixedly connected inside the blower 19. The ionizer 21 is used to ionize the circulating airflow to generate ion wind.

[0071] Specifically, the ionizer 21 generates ion wind to eliminate static electricity on the surface and inner wall of the equipment, thereby further improving the cleaning and collection effect of adhering powder.

[0072] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A graphene production process, characterized in that, Includes the following steps: Step 1, Pretreatment: The natural flake graphite is crushed, screened and dried to obtain pretreated graphite powder; Step 2, oxidation; pretreated graphite powder is added to a reaction vessel along with a strong acid mixture and an oxidizing agent to carry out the oxidation reaction; Step 3, peeling; The graphite oxide is put into an ultrasonic cleaner and deionized water solvent is added to perform the peeling operation to obtain the oxide slurry. Step 4, reduction; the oxidized slurry and reducing agent are added to a hydrothermal reactor to carry out a reduction reaction and obtain graphene; In step one, an integrated crushing and screening device is used when crushing and screening natural flake graphite. The integrated crushing and screening device includes an outer cylinder (1) fixedly connected to a base, a fixed cylinder (2) fixedly connected to the center of the outer cylinder (1), a crushing channel (201) penetrating through the fixed cylinder (2) is provided inside the fixed cylinder (2), a crushing roller (7) connected to a second motor (8) is provided inside the crushing channel (201), a feed pipe (3) extending to the outside of the outer cylinder (1) is fixedly connected to the feed pipe (3), a feeding hopper (4) is fixedly connected to the outer end of the feed pipe (3), and a spiral conveying roller (5) connected to a first motor (6) is provided inside the feed pipe (4). The outer cylinder (1) is rotatably connected to the screen cylinder (10) outside the fixed cylinder (2), and the screen cylinder (10) is connected to a third motor (14) that drives it to rotate; the inner side of the screen cylinder (10) is fixedly connected to a scraper (11) that slides against the fixed cylinder (2), and the upper opening of the crushing channel (201) is located at the upper end of the fixed cylinder (2); the screen cylinder (10) and the outer cylinder (1) form an annular gap, and the lower part of the outer cylinder (1) is fixedly connected to a discharge hood (15) that is tangentially connected to it. The side of the annular gap near the discharge hood (15) is fixedly connected to a spray hood (23) that slides against the screen cylinder (10), and the spray hood (23) is connected to the air supply mechanism.

2. The graphene production process according to claim 1, characterized in that, The air supply mechanism includes a discharge pipe (16) fixedly connected to the discharge hood (15), a cyclone settling cylinder (17) fixedly connected to the outer end of the discharge pipe (16), a central exhaust pipe (18) fixedly connected to the center of the cyclone settling cylinder (17), a blower (19) fixedly connected to the upper end of the central exhaust pipe (18), and a blower (20) fixedly connected inside the blower (19); the air outlet end of the blower (19) is fixedly connected to the main air inlet pipe (22), and the main air inlet pipe (22) is connected to the spray hood (23) through the first air inlet pipe (24).

3. The graphene production process according to claim 2, characterized in that, The upper inner side of the crushing channel (201) is fixedly connected to a material drop hood (9). The lower part of the material drop hood (9) is a conical cylindrical structure with an open lower end. The feed pipe (3) is arranged opposite to the outer wall of the material drop hood (9). The outer end of the feed pipe (3) is fixedly connected to a second air inlet pipe (26). The second air inlet pipe (26) is fixedly connected to the main air inlet pipe (22). The first air inlet pipe (24) is fixedly connected to the main air inlet pipe (22). The second air inlet pipe (26) is fixedly connected to the main air inlet pipe (22). The second air inlet pipe (26) is fixedly connected to the main air inlet pipe (22). The first electromagnetic flow valve (25) and the second electromagnetic flow valve (27) are both electrically connected to the same controller.

4. The graphene production process according to claim 3, characterized in that, The scraper (11) has a side channel (1101) and a side spray hole (1102) connected to the side channel (1101). The airflow sprayed by the side spray hole (1102) is used to spray the outer wall of the fixed cylinder (2) and the inner wall of the outer cylinder (1). The screen cylinder (10) has a connecting channel (1001) connected to the side channel (1101). The side wall of the screen cylinder (10) is fixedly connected to a rotating ring (28). The rotating ring (28) is rotatably nested in the shell wall of the outer cylinder (1). The outer cylinder (1) has an annular air chamber (101) for the rotating ring (28) to rotate. The annular air chamber (101) is fixedly connected to a third air inlet pipe (29). The third air inlet pipe (29) is fixedly connected to the main air inlet pipe (22).

5. The graphene production process according to claim 1, characterized in that, The sieve cylinder (10) is a cylindrical structure with openings at both ends, and its circumferential sidewalls are provided with uniformly distributed sieve holes; the sidewalls of the sieve cylinder (10) are fixedly connected to a toothed ring (12) that is rotatably nested in the outer cylinder (1) shell wall, and the output shaft of the third motor (14) is fixedly connected to a drive gear (13) that is rotatably nested in the outer cylinder (1) shell wall, and the drive gear (13) meshes with the toothed ring (12).

6. The graphene production process according to claim 1, characterized in that, The number of the crushing rollers (7) is not less than two. The crushing rollers (7) extend to the outside of the outer cylinder (1) and adjacent crushing rollers (7) are meshed by transmission gears. One of the crushing rollers (7) is connected to the output shaft of the second motor (8) through a coupling.

7. The graphene production process according to claim 1, characterized in that, The lower opening of the crushing channel (201) is located at the lower part of the fixed cylinder (2). The blow hood (23) is a long strip structure with a fan-shaped cross section. The blow hood (23) has longitudinal blow holes (2301) that are linearly and equally distributed.

8. The graphene production process according to claim 4, characterized in that, A third electromagnetic flow valve (30) is fixedly connected at the connection between the third air intake pipe (29) and the main air intake pipe (22), and the third electromagnetic flow valve (30) is electrically connected to the controller.

9. A graphene production process according to claim 4, characterized in that, An ionizer (21) is fixedly connected inside the blower (19). The ionizer (21) is used to ionize the circulating airflow to generate ion wind.

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