CN112691778A - Device and process for protecting graphite flakes - Google Patents
Device and process for protecting graphite flakes Download PDFInfo
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- CN112691778A CN112691778A CN202011589854.XA CN202011589854A CN112691778A CN 112691778 A CN112691778 A CN 112691778A CN 202011589854 A CN202011589854 A CN 202011589854A CN 112691778 A CN112691778 A CN 112691778A
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- pipe
- crushing
- roller mill
- grinding
- screen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
- B02C2023/165—Screen denying egress of oversize material
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a device for protecting graphite flakes, which comprises a crushing box, a screw conveyor, a roller mill and a vibrating screen, wherein a discharge pipe is arranged below the side wall of the crushing box, the feed end of the screw conveyor is positioned below the discharge pipe, a feed pipe is arranged above the roller mill, and the discharge end of the screw conveyor is positioned above the feed pipe. The phenomenon of damage to graphite flakes caused by the existing ball mill during ore grinding is avoided, and convenience is brought to the use of people.
Description
Technical Field
The invention relates to the technical field of graphite beneficiation, in particular to a device and a process for protecting graphite flakes.
Background
Graphite is an important non-metallic mineral resource, has the properties of high temperature resistance, corrosion resistance, thermal shock resistance, high strength, good toughness, self lubrication, heat conduction, electric conduction and the like, is widely applied to the industries of metallurgy, machinery, electronics, chemical industry, light industry, military industry, national defense, aerospace, refractory materials and the like, is an essential non-metallic material for the development of the current high and new technology, is natural crystalline graphite, is similar to fish phosphorus in shape, belongs to a hexagonal system, has a layered structure, has good properties of high temperature resistance, electric conduction, heat conduction, lubrication, plasticity, acid and alkali resistance and the like, and has higher economic value as the larger the scale is, so that the purity of the graphite scale is improved in the ore dressing process, and the large graphite is protected;
chinese patent CN109909062A discloses a mineral separation method of protective scales for fine-grained crystalline graphite ore, which comprises the steps of firstly, coarsely grinding raw ore, sequentially carrying out four times of rapid flotation, carrying out rough concentration and scavenging after rod milling on obtained rapid flotation tailings, merging obtained rough concentrates subjected to rapid flotation and rough concentration, entering a fine concentration and preselection stage, and sequentially carrying out two-stage fine concentration and rod milling;
the process can protect the graphite flakes to a certain extent in the graphite mineral separation, but the process needs to carry out multiple times of flotation, regrinding and recleaning, most of the existing mineral grinding equipment is a ball mill and a rod mill, the graphite flakes are point-contacted, the damage is large, and the use is inconvenient.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device and a process for protecting graphite flakes, and solves the problems of poor protection of the graphite flakes and complex process in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme: a device for protecting graphite flakes comprises a crushing box, a screw conveyer, a roller mill and a vibrating screen, wherein a discharging pipe is arranged below the side wall of the crushing box, the feed end of the screw conveyer is arranged below the discharging pipe, an inlet pipe is arranged above the roller mill, the discharge end of the screw conveyer is arranged above the inlet pipe, a motor is arranged below the roller mill, the motor drive end is connected with a speed reducer, the output end of the speed reducer extends into the roller mill and is connected with a grinding disc, a material blocking ring is arranged at the excircle above the grinding disc, a base is installed on the lower wall of the motor, a pair of hydraulic devices are arranged on the upper wall of the base, a pair of hydraulic device drive ends are connected with a rocker arm, the other end of the rocker arm is connected with a grinding roller, the side wall of the roller mill is provided with an installation opening, the grinding roller penetrates through the installation opening to be pressed on the, the lower wall of the liquid outlet cavity is provided with a discharging pipe, the other end of the discharging pipe is communicated with the vibrating screen, and a crushing assembly is arranged in the crushing box.
Preferably, broken subassembly is including locating the feeder hopper of broken case top, broken incasement symmetry is equipped with a pair of crushing roller, and is a pair of the crushing roller lateral wall all is equipped with a plurality of broken teeth, broken incasement just is located crushing roller below department is equipped with the screen cloth, vibrating motor is installed to the screen cloth lower wall, broken incasement just is located screen cloth below department slope installs the guide plate, the discharging pipe is located guide plate lower extreme one side department.
Preferably, the side wall of the crushing box is provided with a material taking sliding door at one side of the screen.
Preferably, a water inlet pipe and a material return pipe are arranged above the side wall of the roller mill, and the water inlet pipe and the material return pipe are communicated with the material inlet pipe.
Preferably, the feed pipe extends into the interior of the roller mill and the lower end is located above the center of the grinding disc.
A process for protecting graphite flakes, comprising the steps of:
the method comprises the following steps: conveying raw graphite ores into a crushing box through a feed hopper, rotating a pair of crushing rollers, crushing the raw graphite ores by using crushing teeth arranged on the crushing rollers, dropping crushed graphite powder onto a screen, and dropping the graphite powder which meets the specification onto a guide plate under the action of a vibration motor;
step two: graphite powder enters a spiral conveyor from a discharge pipe under the action of a guide plate, and the spiral conveyor conveys the graphite powder to the upper part of a feed pipe of the roller mill and conveys the graphite powder to the roller mill from the feed pipe;
step three: under the action of the feeding pipe, the graphite powder falls to the upper part of the grinding disc, water is injected into the roller mill through the water inlet pipe to form ore pulp, the motor is started, the grinding disc rotates to enable the ore pulp to move to the edge of the grinding disc, and the grinding disc is matched with the grinding roller to finish ore grinding;
step four: the ore pulp overflows the material blocking ring and then enters the liquid outlet cavity, enters the vibrating screen for classification under the action of the material discharging pipe, the product on the screen flows back to the roller mill through the return pipe for secondary crushing, and the product below the screen is the qualified product.
Advantageous effects
The invention provides a device and a process for protecting graphite flakes, which have the following beneficial effects that the device is compact in structure, raw ores are crushed into graphite powder by a crushing roller and are conveyed into a roller mill by a screw conveyor, ore pulp is formed by injecting water into the roller mill, the grinding roller is matched with a grinding disc to grind the ore pulp, the ore pulp is classified by a vibrating screen after the ore grinding is finished, and graphite which does not meet requirements flows back into the roller mill again through a return pipe to be ground again.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a crushing box; 2. a screw conveyor; 3. a roller mill; 4. vibrating screen; 5. a discharge pipe; 6. a feed pipe; 7. a motor; 8. a speed reducer; 9. a grinding disc; 10. a material blocking ring; 11. a base; 12. a hydraulic device; 13. a rocker arm; 14. grinding the roller; 15. a liquid outlet cavity; 16. a discharge pipe; 17. a feed hopper; 18. a crushing roller; 19. crushing teeth; 20. screening a screen; 21. a vibration motor; 22. a baffle; 23. a material taking sliding door; 24. a water inlet pipe; 25. a return pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a device for protecting graphite flakes comprises a crushing box 1, a screw conveyor 2, a roller mill 3 and a vibrating screen 4, wherein a discharging pipe 5 is arranged below the side wall of the crushing box 1, a feeding end of the screw conveyor 2 is arranged below the discharging pipe 5, a feeding pipe 6 is arranged above the roller mill 3, a discharging end of the screw conveyor 2 is arranged above the feeding pipe 6, a motor 7 is arranged below the roller mill 3, a driving end of the motor 7 is connected with a speed reducer 8, an output end of the speed reducer 8 extends into the roller mill 3 and is connected with a grinding disc 9, a material blocking ring 10 is arranged at an excircle position above the grinding disc 9, a base 11 is installed on the lower wall of the motor 7, a pair of hydraulic devices 12 is arranged on the upper wall of the base 11, a pair of driving ends of the hydraulic devices 12 are connected with a rocker arm 13, the other end of the rocker arm 13, the grinding roller 14 penetrates through the mounting opening and is pressed on the upper wall of the grinding disc 9, a liquid outlet cavity 15 is arranged in the roller mill 3 and below the grinding disc 9, a discharge pipe 16 is arranged on the lower wall of the liquid outlet cavity 15, the other end of the discharge pipe 16 is communicated with the vibrating screen 4, and a crushing assembly is arranged in the crushing box 1; the crushing assembly comprises a feed hopper 17 arranged above the crushing box 1, a pair of crushing rollers 18 are symmetrically arranged in the crushing box 1, a plurality of crushing teeth 19 are arranged on the side walls of the pair of crushing rollers 18, a screen 20 is arranged in the crushing box 1 and below the crushing rollers 18, a vibrating motor 21 is arranged on the lower wall of the screen 20, a guide plate 22 is obliquely arranged in the crushing box 1 and below the screen 20, and the discharge pipe 5 is arranged on one side of the lower end of the guide plate 22; a material taking sliding door 23 is arranged on the side wall of the crushing box 1 and positioned on one side of the screen mesh 20; a water inlet pipe 24 and a material return pipe are arranged above the side wall of the roller mill 3, and the water inlet pipe 24 and the material return pipe are both communicated with the material inlet pipe 6; the feed pipe 6 extends into the interior of the roller mill 3 and has its lower end located above the centre of the grinding disc 9.
A process for protecting graphite flakes, comprising the steps of:
the method comprises the following steps: conveying raw graphite ores into a crushing box 1 through a feed hopper 17, rotating a pair of crushing rollers 18, crushing the raw graphite ores by crushing teeth 19 arranged on the crushing rollers, dropping crushed graphite powder to a screen 20, and dropping the graphite powder meeting the specification above a guide plate 22 under the action of a vibration motor 21;
step two: graphite powder enters the screw conveyor 2 from the discharge pipe 5 under the action of the guide plate 22, and the screw conveyor 2 conveys the graphite powder to the upper part of the feed pipe 6 of the roller mill 3 and conveys the graphite powder into the roller mill 3 from the feed pipe 6;
step three: under the action of the feeding pipe 6, graphite powder falls to the position above the grinding disc 9, water is injected into the roller mill 3 through the water inlet pipe 24 to form ore pulp, the motor 7 is started, the grinding disc 9 rotates to enable the ore pulp to move to the edge of the grinding disc 9, and the grinding operation is completed by matching with the grinding roller 14;
step four: the ore pulp overflows the material blocking ring 10 and then enters the liquid outlet cavity 15, enters the vibrating screen 4 for classification under the action of the material discharging pipe 16, the oversize products flow back to the roller mill 3 through the return pipe 25 for re-grinding, and the undersize products are qualified products.
The following working principles, detailed connecting means thereof, and the following main descriptions of the working principles and processes thereof are well known in the art, and will be referred to by those skilled in the art for the specific connection and operation sequence of the components in the present disclosure.
Example (b): the graphite raw ore is conveyed into a crushing box 1 by a feed hopper 17, a pair of crushing rollers rotate, staggered crushing teeth 19 crush the raw ore into graphite powder and fall onto a screen 20, a vibration motor 21 is started to vibrate the screen 20, the graphite powder meeting the specification falls onto a guide plate 22, the guide plate 22 is obliquely arranged, the graphite powder enters a spiral conveyor 2 and is protected and conveyed into a roller mill 3 by the spiral conveyor 2, the graphite powder accurately falls onto a grinding disc 9 under the action of a feed pipe 6, water is introduced into a water inlet pipe 24 at the moment to be mixed with the graphite powder into slurry, a motor 7 is started to rotate the grinding disc 9, a grinding roller 14 is pressed above the grinding disc 9 by a hydraulic device 12 and a rocker arm 13, the slurry is flattened by centrifugal force generated by the rotation of the grinding disc 9 and moves to the edge, the ground slurry overflows from a baffle ring 10 to a liquid outlet cavity 15 and enters a vibration screen 4 for classification by a discharge pipe 16, the undersize is qualified product, and the oversize product is returned to the roller mill 3 through the return pipe 25 for fine grinding again.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The device for protecting graphite flakes is characterized by comprising a crushing box (1), a screw conveyor (2), a roller mill (3) and a vibrating screen (4), wherein a discharging pipe (5) is arranged below the side wall of the crushing box (1), the feeding end of the screw conveyor (2) is arranged below the discharging pipe (5), an inlet pipe (6) is arranged above the roller mill (3), the discharging end of the screw conveyor (2) is arranged above the inlet pipe (6), a motor (7) is arranged below the roller mill (3), the driving end of the motor (7) is connected with a speed reducer (8), the output end of the speed reducer (8) extends into the roller mill (3) and is connected with a grinding disc (9), a material blocking ring (10) is arranged at the outer circle above the grinding disc (9), a base (11) is installed on the lower wall of the motor (7), a pair of hydraulic devices (12) is arranged on the upper wall of the base (11), it is a pair of hydraulic means (12) drive end is connected with rocking arm (13), rocking arm (13) other end is connected with grinding roller (14), grinding roller (3) lateral wall is equipped with the installing port, grinding roller (14) pass the installing port press cover in mill (9) upper wall, just be located in grinding roller (3) mill (9) below department is equipped with out sap cavity (15), it is equipped with row's material pipe (16) to go out sap cavity (15) lower wall, arrange material pipe (16) the other end with shale shaker (4) intercommunication, be equipped with broken subassembly in broken case (1).
2. The device for protecting graphite flakes according to claim 1, wherein the crushing assembly comprises a feed hopper (17) arranged above the crushing box (1), a pair of crushing rollers (18) is symmetrically arranged in the crushing box (1), a pair of crushing teeth (19) are arranged on the side walls of the crushing rollers (18), a screen (20) is arranged in the crushing box (1) and below the crushing rollers (18), a vibrating motor (21) is installed on the lower wall of the screen (20), a guide plate (22) is obliquely installed in the crushing box (1) and below the screen (20), and the discharge pipe (5) is located on one side of the lower end of the guide plate (22).
3. The device for protecting graphite flakes according to claim 2, wherein a material taking sliding door (23) is arranged on the side wall of the crushing box (1) and at one side of the screen (20).
4. The device for protecting graphite flakes according to claim 1, wherein a water inlet pipe (24) and a material return pipe are arranged above the side wall of the roller mill (3), and the water inlet pipe (24) and the material return pipe are both communicated with the material inlet pipe (6).
5. A device for protecting graphite flakes according to claim 1, characterized in that the feed pipe (6) extends into the interior of the roller mill (3) and has its lower end located above the center of the grinding disc (9).
6. A process for protecting graphite flakes, using the apparatus for protecting graphite flakes of claims 1-5, comprising the steps of:
the method comprises the following steps: conveying raw graphite ores into a crushing box (1) through a feed hopper (17), rotating a pair of crushing rollers (18), crushing the raw graphite ores by crushing teeth (19) arranged on the crushing rollers, dropping crushed graphite powder to a screen (20), and dropping the graphite powder meeting the specification above a guide plate (22) under the action of a vibration motor (21);
step two: graphite powder enters the screw conveyor (2) from the discharge pipe (5) under the action of the guide plate (22), the screw conveyor (2) conveys the graphite powder to the upper part of the feed pipe (6) of the roller mill (3), and the graphite powder is conveyed into the roller mill (3) from the feed pipe (6);
step three: under the action of the feeding pipe (6), graphite powder falls to the position above the grinding disc (9), water is injected into the roller mill (3) through the water inlet pipe (24) to form ore pulp, the motor (7) is started, the grinding disc (9) rotates to enable the ore pulp to move towards the edge of the grinding disc (9), and the grinding operation is completed by matching with the grinding roller (14);
step four: the ore pulp overflows after overflowing the material blocking ring (10) and enters the liquid outlet cavity (15), enters the vibrating screen (4) for classification under the action of the material discharging pipe (16), products on the screen flow back to the roller mill (3) through the return pipe (25) for re-grinding, and the products under the screen are qualified products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011589854.XA CN112691778A (en) | 2020-12-29 | 2020-12-29 | Device and process for protecting graphite flakes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011589854.XA CN112691778A (en) | 2020-12-29 | 2020-12-29 | Device and process for protecting graphite flakes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112691778A true CN112691778A (en) | 2021-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011589854.XA Pending CN112691778A (en) | 2020-12-29 | 2020-12-29 | Device and process for protecting graphite flakes |
Country Status (1)
| Country | Link |
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| CN (1) | CN112691778A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113413994A (en) * | 2021-06-23 | 2021-09-21 | 太湖县野滋味食品商贸有限公司 | Breaker is used in tea-seed oil seed production |
| CN117101840A (en) * | 2023-10-23 | 2023-11-24 | 黑龙江省宝泉岭农垦溢祥石墨有限公司 | Wet-type roller mill device for protecting graphite flake |
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| CN209697023U (en) * | 2019-03-04 | 2019-11-29 | 郧西九丰钒业投资有限公司 | A kind of navajoite processing material stone roller material device |
| CN210875649U (en) * | 2019-09-27 | 2020-06-30 | 郴州恒翔石墨有限公司 | Reducing mechanism of graphite powder processing |
| CN211359139U (en) * | 2019-12-20 | 2020-08-28 | 中华人民共和国青岛邮局海关 | Plant fruit seed grinds reducing mechanism |
| CN212120147U (en) * | 2020-04-29 | 2020-12-11 | 焦作市东星炭电极有限公司 | Breaker is used in graphite electrode production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854992A (en) * | 2016-04-05 | 2016-08-17 | 申士富 | Wet method roller type disintegrating mill and grading closed-circuit process thereof |
| CN105964375A (en) * | 2016-07-18 | 2016-09-28 | 何保罗 | Flaky graphite regrinding mill |
| CN106732966A (en) * | 2016-12-09 | 2017-05-31 | 长沙矿冶研究院有限责任公司 | A kind of wet type roll-type grinding system |
| CN207605851U (en) * | 2017-11-13 | 2018-07-13 | 四川领航石墨制品有限公司 | A kind of graphite raw ore processing ore grinding device |
| CN108295966A (en) * | 2018-04-16 | 2018-07-20 | 中材（天津）粉体技术装备有限公司 | A kind of vertical roller grinder wet type grinding method and system |
| CN108479956A (en) * | 2018-04-16 | 2018-09-04 | 中材（天津）粉体技术装备有限公司 | It is a kind of can wet type grinding vertical roll grinder |
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| CN209697023U (en) * | 2019-03-04 | 2019-11-29 | 郧西九丰钒业投资有限公司 | A kind of navajoite processing material stone roller material device |
| CN210875649U (en) * | 2019-09-27 | 2020-06-30 | 郴州恒翔石墨有限公司 | Reducing mechanism of graphite powder processing |
| CN211359139U (en) * | 2019-12-20 | 2020-08-28 | 中华人民共和国青岛邮局海关 | Plant fruit seed grinds reducing mechanism |
| CN212120147U (en) * | 2020-04-29 | 2020-12-11 | 焦作市东星炭电极有限公司 | Breaker is used in graphite electrode production |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113413994A (en) * | 2021-06-23 | 2021-09-21 | 太湖县野滋味食品商贸有限公司 | Breaker is used in tea-seed oil seed production |
| CN117101840A (en) * | 2023-10-23 | 2023-11-24 | 黑龙江省宝泉岭农垦溢祥石墨有限公司 | Wet-type roller mill device for protecting graphite flake |
| CN117101840B (en) * | 2023-10-23 | 2024-01-12 | 黑龙江省宝泉岭农垦溢祥石墨有限公司 | Wet-type roller mill device for protecting graphite flake |
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Application publication date: 20210423 |