CN108529616B - High-temperature purification process and device for natural graphite - Google Patents
High-temperature purification process and device for natural graphite Download PDFInfo
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- CN108529616B CN108529616B CN201810604668.5A CN201810604668A CN108529616B CN 108529616 B CN108529616 B CN 108529616B CN 201810604668 A CN201810604668 A CN 201810604668A CN 108529616 B CN108529616 B CN 108529616B
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Abstract
A high-temperature purification process and a device of natural graphite comprise the following steps: firstly, preprocessing, removing water and organic volatile matters in raw materials; secondly, feeding the raw materials into a rotary calcining device for calcining, wherein the raw materials are uniformly heated in a suspended state during calcining; the temperature is 2600-4200 ℃, and the time is 6-40 min; protective gas is filled into the calcining device to form protective atmosphere; the concentration of the protective gas is more than or equal to 85 percent, and the pressure is 0.005-0.1 MPa; thirdly, sublimating the impurity components into gas which overflows from an exhaust channel of the calcining device, and discharging the graphite product through a discharge end; the device comprises a feeding section, a calcining section and a discharging section; the feeding section comprises a first heating cylinder body which is provided with a feeding hole and a feeding mechanism; the calcining section is provided with a rotary second heating cylinder, the front end of the calcining section is connected with the feeding mechanism, and the rear end of the calcining section is connected with the discharging section; the discharge section comprises a third heating cylinder body which is provided with a discharge port and an air injection port, and the third heating cylinder body is used for blowing and injecting protective gas into the device; the device is also provided with an exhaust port which is positioned at the front part of the calcining section and is upwards opened.
Description
Technical Field
The invention relates to the field of processing of natural graphite in non-metallic ores, in particular to a high-temperature purification process and a high-temperature purification device for natural graphite.
Background
Graphite is one of the most important non-metallic mineral resources in the world and has wide application. Based on its excellent electrical conductivity, thermal conductivity, high temperature resistance, and resistance to rapid cooling and heating, graphite is an essential raw material for metal smelting, mechanical manufacturing, electronic industry, aerospace and military industry, and more particularly, is one of the most important raw materials for graphene manufacturing.
Because the purity of the natural graphite is limited, the natural graphite is usually purified by a flotation method, the natural graphite can be purified to the highest grade of 95-97% containing fixed carbon, and a chemical method or a high-temperature purification method is needed for preparing the graphite with higher purity. The chemical method can enable the purity of the graphite to reach 99-99.9%, but chemicals such as acid, alkali, hydrofluoric acid and the like are needed, so that the improvement of the purity is restricted, a large amount of waste water, waste gas and even toxic substances are generated, the environment is seriously polluted, and a plurality of provinces are definitely forbidden to use; the principle of the high-temperature method is that impurities in natural graphite are naturally sublimated to be in a gas state at 2800-3000 ℃, the graphite still keeps a solid state, and after solid-gas separation, high-purity graphite with the purity of more than 99-99.999% can be obtained, and meanwhile, the method is harmless to the environment, so that the method is widely valued and has a wide application prospect.
With the development of nuclear industry, lithium ion battery cathode material industry, artificial diamond industry and graphene industry, high-purity graphite is in short supply, and particularly high-purity high-crystallinity graphite purified at high temperature is more scarce.
At present, the equipment used by the existing high-temperature purification technology is usually a high-temperature furnace such as an Acheson furnace or an inner series furnace, and the process adopting the existing equipment is indirect operation and has the following defects: firstly, the product quality is unstable, and the quality of each batch of products has certain difference; secondly, the energy consumption is high, and 12000-18000 kWh/t of electric energy needs to be consumed for each ton of products; and thirdly, the equipment yield is low, and the annual yield is about 400 t/station.
Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.
Disclosure of Invention
The invention aims to provide a high-temperature purification process and a high-temperature purification device for natural graphite.
In order to achieve the purpose, the technical scheme adopted by the invention in the technical layer is as follows:
a high-temperature purification process of natural graphite comprises the following steps:
firstly, pretreating a graphite raw material to remove water and organic volatile matters in the raw material;
secondly, feeding the pretreated graphite raw material into a rotary calcining device for calcining, wherein the graphite raw material is in a suspended state in the calcining process, so that the graphite raw material is uniformly heated;
wherein the calcining temperature is 2600-4200 ℃, and the calcining time is 6-40 min; in the calcining process, protective gas is filled into the calcining device to form protective atmosphere in the calcining device; the concentration of the protective gas is greater than or equal to 85%, and the pressure is 0.005-0.1 MPa;
and thirdly, sublimating the impurity components into gas which overflows from an exhaust channel of the calcining device, and discharging the graphite product from a discharge end of the calcining device.
The relevant content in the above technical solution is explained as follows:
1. in the scheme, the graphite raw material is powdery natural crystalline flake graphite (or earthy graphite), the fixed carbon content in the raw material is at least 80-95%, 95-97% is preferred, too low carbon content means more impurities, and exhaust gas is easy to block an exhaust passage during calcination.
2. In the scheme, the protective gas can be inert gases such as argon, nitrogen and the like.
3. In the scheme, the pretreatment in the first step comprises calcination or roasting for at least 20min, and the temperature is 550-1000 ℃. The water content in the pretreated graphite raw material is not higher than 0.05%, and the pretreatment process is not the invention point of the invention, so the conditions of pretreatment time, temperature and the like can be adjusted according to specific conditions, and are not described again.
4. In the scheme, the calcination temperature in the second step is preferably 2800-3000 ℃, so that impurities such as MgO, CaO, Fe3O4, SiO2 and the like in the graphite can be effectively gasified.
5. In the scheme, the calcination time in the second step is 8-30 min.
6. In the above embodiment, the concentration of the protective gas in the calcination apparatus in the second step is greater than or equal to 95%.
7. In the scheme, the pressure of the protective gas in the calcining device in the second step is 0.01-0.03 MPa.
8. In the scheme, besides the calcining temperature, the calcining method also comprises a feeding temperature before calcining and a discharging temperature after calcining; wherein the feeding temperature is 1500-2800 ℃, preferably 1600-2600 ℃, and preheating is carried out before calcination; the discharging temperature is 2600-4200 ℃, preferably 2800-3000 ℃ to stabilize the production quality and avoid the crystallization of gasified impurities in the atmosphere.
9. In the above scheme, in the third step, the exhaust temperature is 2600 ℃ or higher, preferably 2800 ℃ or higher, so as to prevent impurities from crystallizing due to temperature reduction and blocking the exhaust channel.
10. In the scheme, the method further comprises a fourth step of cooling the discharged graphite product to 30-50 ℃. Because the product temperature just after the ejection of compact still reaches 1500~1800 ℃, therefore need advance to go into a discharge system after the graphite product ejection of compact, this discharge system is through the water-cooling with the temperature of graphite product drop to low temperature and pack again.
In order to achieve the purpose, the technical scheme adopted by the invention at the device level is as follows:
a high-temperature purification device for natural graphite comprises a feeding section, a calcining section and a discharging section which are sequentially communicated from front to back in the horizontal direction;
the feeding section comprises a first heating cylinder body, a feeding hole is formed in the first heating cylinder body, and a feeding mechanism is arranged in the first heating cylinder body;
the calcining section is provided with a rotary second heating cylinder body which is horizontally laid and rotates along the central line of the horizontal direction; the front end of the second heating cylinder is connected with the feeding mechanism of the feeding section, and the rear end of the second heating cylinder is connected with the discharging section; the feeding mechanism feeds the graphite raw material into a second heating cylinder, and the graphite raw material enters the discharging section after being heated and calcined by the second heating cylinder;
the discharging section comprises a third heating cylinder body, and a discharging hole is formed in the third heating cylinder body and used for discharging; the gas injection port is used for blowing and injecting protective gas into the device to form a forward moving gas flow in the third heating cylinder and the second heating cylinder;
the device is also provided with an exhaust port which is positioned at the front part of the calcining section and is upwards opened for exhausting waste gas generated during calcining.
The relevant content in the above technical solution is explained as follows:
1. in the above scheme, the gas injection port forms a gas flow by blowing protective gas, and the gas flow moves in the third heating cylinder and the second heating cylinder in a counterclockwise line, so that on one hand, a protective atmosphere can be formed inside the device, and on the other hand, waste gas generated during calcination can be pushed forwards to be discharged through the exhaust port.
2. In the above scheme, the structural composition of the first heating cylinder sequentially comprises a heating layer, a heat preservation layer and a shell from inside to outside when viewed from the cross section angle. The heating layer can be composed of carbon heating elements and adopts a resistance heating mode.
3. In the above scheme, the structure composition of the second heating cylinder and the third heating cylinder sequentially comprises an electromagnetic induction heating layer, a heat preservation layer, an insulating layer and an electrified coil from inside to outside when viewed from the cross section angle.
4. In the above scheme, the heat insulating layers of the second heating cylinder and the third heating cylinder are formed by combining a hard carbon felt occupying 1/3 thickness and a soft carbon felt occupying 2/3 thickness from inside to outside, so as to meet the more severe heat insulating requirement.
5. In the above scheme, the insulating layer is a non-metal magnetic barrier layer.
6. In the scheme, the electrifying coil adopts medium-frequency direct current or alternating current to effectively penetrate the second heating cylinder and the third heating cylinder, low-frequency current cannot effectively penetrate the second heating cylinder and high-frequency current has higher requirement on a circuit structure; the electrified coil is of a water-flowing hollow wire structure so as to carry out water-cooling during electrification.
7. In the scheme, the electromagnetic induction heating mode in a non-contact mode is adopted, the electrothermal conversion rate can reach 96%, and besides the electrothermal conversion rate, plasma heating and arc heating modes can be adopted, but the electromagnetic induction heating efficiency is not as high.
8. In the above scheme, the feeding mechanism is a horizontally arranged spiral pushing rod, the feeding port is arranged corresponding to the front end of the spiral pushing rod, and the rear end of the spiral pushing rod is arranged corresponding to the calcining section and is used for horizontally pushing the powdery graphite raw material which is put through the feeding port into the calcining section.
9. In the above scheme, a discharging mechanism is arranged in the third heating cylinder, the discharging mechanism is a horizontally arranged spiral pushing rod, the front end of the discharging mechanism corresponds to the calcining section, and the rear end of the discharging mechanism corresponds to the discharging port, and is used for horizontally pushing and discharging the calcined graphite product.
10. In the scheme, a plurality of lifting plates are arranged on the inner wall of the second heating cylinder at intervals, and are arranged along the circumferential direction of the second heating cylinder and extend towards the inside of the second heating cylinder;
the outer end of the lifting plate is fixedly arranged on the inner wall of the second heating cylinder, a hook-shaped part is formed at the inner end of the lifting plate, and the hook-shaped part is arranged towards the rotation direction of the second heating cylinder.
11. In the scheme, the device further comprises a supporting part, a supporting wheel part, a driving mechanism and a transmission structure; the supporting part is fixedly arranged on the ground, the upper end of the supporting part is used for being connected with the supporting wheel part or the transmission structure, and the supporting wheel part rotatably supports the second heating cylinder; the driving mechanism drives the second heating cylinder body to rotate through the transmission structure.
The driving mechanism comprises a motor and a speed reducer, and the transmission structure comprises a gear transmission structure consisting of a large gear and a small gear, and can also be a belt transmission structure; the specific structural forms of the driving mechanism and the transmission structure have various implementation schemes, which are well known by those skilled in the art, and thus the detailed description of the present application is omitted.
12. In the above scheme, the exhaust port is connected with an exhaust passage, and the side wall structure of the exhaust passage sequentially comprises a heating layer, a heat preservation layer and a shell from inside to outside.
The exhaust port and the exhaust passage can be positioned at the rear end of the feeding section, and the side wall structure of the exhaust passage can be consistent with that of the first heating cylinder, so that the continuous heating is realized, the gasified impurities are prevented from being condensed due to low temperature when being discharged through the exhaust passage, and the exhaust passage is prevented from being blocked.
13. In the scheme, the exhaust passage is also connected with a cyclone dust removal device for separating and collecting large-particle impurities in exhaust gas, and the large-particle impurities can be used as building raw materials; the cyclone dust collector is also provided with a dust collecting cloth bag in a connecting way for collecting dust impurities in the exhaust gas so as to ensure that the gas exhausted to the environment meets the requirement of environmental protection.
14. In the above scheme, dynamic seals are formed between the feeding section and the calcining section, and between the calcining section and the discharging section through sealing structures (such as sealing strips).
The working principle and the advantages of the invention are as follows:
the invention relates to a high-temperature purification process and a device of natural graphite, wherein the process comprises the following steps: firstly, preprocessing, removing water and organic volatile matters in raw materials; secondly, feeding the raw materials into a rotary calcining device for calcining, wherein the raw materials are uniformly heated in a suspended state during calcining; the temperature is 2600-4200 ℃, and the time is 6-40 min; protective gas is filled into the calcining device to form protective atmosphere; the concentration of the protective gas is more than or equal to 85 percent, and the pressure is 0.005-0.1 MPa; thirdly, sublimating the impurity components into gas which overflows from an exhaust channel of the calcining device, and discharging the graphite product through a discharge end;
the device comprises a feeding section, a calcining section and a discharging section; the feeding section comprises a first heating cylinder body which is provided with a feeding hole and a feeding mechanism; the calcining section is provided with a rotary second heating cylinder, the front end of the calcining section is connected with the feeding mechanism, and the rear end of the calcining section is connected with the discharging section; the discharge section comprises a third heating cylinder body, the third heating cylinder body is provided with a discharge hole and an air injection port, and the air injection port is used for blowing and injecting protective gas into the device to form a forward moving airflow in the third heating cylinder body and the second heating cylinder body; the device is also provided with an exhaust port which is positioned at the front part of the calcining section and is upwards opened for exhausting waste gas generated during calcining.
Compared with the prior art, the purification process is a continuous purification process at high temperature, the energy consumption can be reduced to 5000-7000 kWh/t, the continuous production quality is stable, the production efficiency is high, and the annual yield can reach 500-1200 t/a.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic view of the cross-sectional structure of FIG. 1 taken along the direction C-C;
fig. 5 is a schematic structural view of the exhaust system at I in fig. 1.
In the above drawings: 1. a feeding section; 2. a calcination section; 3. a discharging section; 4. a sealing strip; 5. a first heating cylinder; 6. a feed inlet; 7. a heat generating layer; 8. a heat-insulating layer; 9. a housing; 10. a screw pusher bar; 11. a second heating cylinder; 12. a material raising plate; 13. a third heating cylinder; 14. a discharge port; 15. a gas injection port; 16. a gas stream; 17. an exhaust port; 18. an electromagnetic induction heating layer; 19. a heat-insulating layer; 20. an insulating layer; 21. an electrified coil; 22. a screw pusher bar; 23. an exhaust passage; 24. a cyclone dust removal device; 25. a dust collecting cloth bag; 26. a support portion; 27. a carrier part; 28. a pinion gear; 29. and a gearwheel.
Detailed Description
The invention is further described with reference to the following figures and examples:
example (b): referring to fig. 1, a high-temperature purification process and apparatus for natural graphite, wherein the process comprises the following steps:
firstly, pretreating a graphite raw material to remove water and organic volatile matters in the raw material; the pretreatment comprises calcination or roasting for at least 20min at 550-1000 ℃. The water content in the pretreated graphite raw material is not higher than 0.05%, and the pretreatment process is not the invention point of the invention, so the conditions of pretreatment time, temperature and the like can be adjusted according to specific conditions, and are not described again.
Secondly, feeding the pretreated graphite raw material into a rotary calcining device for calcining, wherein the graphite raw material is in a suspended state in the calcining process, so that the graphite raw material is uniformly heated;
wherein the calcining temperature is 2600-4200 ℃, preferably 2800-3000 ℃, so as to effectively gasify impurities such as MgO, CaO, Fe3O4, SiO2 and the like in the graphite; the calcination time is 6-40 min, preferably 8-30 min; in the calcining process, protective gas (such as argon, nitrogen and the like) is filled into the calcining device to form protective atmosphere in the calcining device; the concentration of the protective gas is greater than or equal to 85%, preferably greater than or equal to 95%, and the pressure is 0.005-0.1 MPa, preferably 0.01-0.03 MPa.
Thirdly, sublimating impurity components, namely, overflowing gas from an exhaust channel of the calcining device, wherein the exhaust temperature is higher than or equal to 2600 ℃, preferably higher than or equal to 2800 ℃, so as to prevent gasified impurities from being condensed due to temperature reduction and further blocking the exhaust channel; the graphite product is discharged from the discharge end of the calcining device, and the purity can reach 99-99.999%.
In the second step, besides the calcining temperature, the charging temperature before calcining and the discharging temperature after calcining are also included; wherein the feeding temperature is 1500-2800 ℃, preferably 1600-2600 ℃, and preheating is carried out before calcination; the discharging temperature is 2600-4200 ℃, preferably 2800-3000 ℃ to stabilize the production quality and avoid the crystallization of gasified impurities in the atmosphere.
And the fourth step is that the graphite product after being discharged is cooled to 30-50 ℃. Because the product temperature just after the ejection of compact still reaches 1500~1800 ℃, therefore need advance to go into a discharge system after the graphite product ejection of compact, this discharge system is through the water-cooling with the temperature of graphite product drop to low temperature and pack again.
As shown in fig. 1-4, the device comprises a feeding section 1, a calcining section 2 and a discharging section 3 which are sequentially communicated from front to back in the horizontal direction; wherein dynamic seals are formed between the feeding section 1 and the calcining section 2 and between the calcining section 2 and the discharging section 3 through sealing structures, such as sealing strips 4. The device is also provided with an exhaust port 17, wherein the exhaust port 17 is positioned at the front part of the calcining section 2, is arranged on the feeding section 1 and is upwards opened, and is used for discharging waste gas generated in the calcining process, and the waste gas comprises gasified impurities and part of protective gas.
As shown in fig. 2, the feeding section 1 includes a first heating cylinder 5, a feeding port 6 is arranged above the front end of the first heating cylinder 5, and a feeding mechanism is arranged in the first heating cylinder 5; the structure of the first heating cylinder 5 comprises a heating layer 7, a heat preservation layer 8 and a shell 9 from inside to outside in sequence when viewed from the cross section angle, the heating layer 7 of the first heating cylinder 5 can be composed of carbon heating elements, and a resistance heating mode is adopted. The feeding mechanism is a horizontally arranged spiral pushing rod 10, the feeding port 6 is arranged corresponding to the front end of the spiral pushing rod 10, and the rear end of the spiral pushing rod 10 is arranged corresponding to the calcining section 2 and used for horizontally pushing the powdery graphite raw material which is put in through the feeding port 6 to the calcining section 2.
As shown in fig. 3, the calcining section 2 has a second heating cylinder 11 (i.e., a rotary kiln) which rotates, and the second heating cylinder 11 is horizontally laid and rotates along the horizontal center line thereof; the front end of the second heating cylinder 11 is connected with the feeding mechanism of the feeding section 1, and the rear end of the second heating cylinder 11 is connected with the discharging section 3; the feeding mechanism feeds the powdery graphite raw material into the second heating cylinder 11, and the powdery graphite raw material enters the discharging section 3 after being heated and calcined by the second heating cylinder 11; a plurality of lifting plates 12 are arranged on the inner wall of the second heating cylinder 11 at intervals, and each lifting plate 12 is arranged along the circumferential direction of the second heating cylinder 11 and extends towards the inside of the second heating cylinder 11; the outer end of the material raising plate 12 is fixedly disposed on the inner wall of the second heating cylinder 11, and the inner end of the material raising plate 12 is formed with a hook-shaped portion (not shown) which is disposed toward the rotation direction of the second heating cylinder 11, so that the design of the material raising plate 12 is helpful for raising graphite in a rotary manner in the second heating cylinder 11 to keep the graphite in a suspended state during calcination.
As shown in fig. 4, the discharging section 3 includes a third heating cylinder 13, a discharging hole 14 is formed in the third heating cylinder 13, and the discharging hole 14 is located below the rear end of the third heating cylinder 13 and used for discharging; the gas injection port 15 is located at the upper part of the rear end of the third heating cylinder 13, and is used for injecting protective gas into the device to form a forward moving gas flow 16 in the third heating cylinder 13 and the second heating cylinder 11, and the movement of the gas flow 16 in the third heating cylinder 13 and the second heating cylinder 11 is in a counterclockwise line, so that on one hand, a protective atmosphere can be formed in the device, and on the other hand, waste gas generated during calcination can be pushed forward to be discharged through the exhaust port 17.
As shown in fig. 3 and 4, the second heating cylinder 11 and the third heating cylinder 13 respectively include an electromagnetic induction heating layer 18, a heat insulating layer 19, an insulating layer 20, and an electrical coil 21 from inside to outside in sequence when viewed from a cross section. The heat insulation layers 19 of the second heating cylinder 11 and the third heating cylinder 13 are respectively formed by combining a hard carbon felt (not shown) with a thickness of 1/3 and a soft carbon felt (not shown) with a thickness of 2/3 from inside to outside so as to meet the more severe heat insulation requirement; the insulating layer 20 is a non-metal magnetic isolating layer; the electrified coil 21 adopts medium-frequency direct current or alternating current to realize effective penetration on the second heating cylinder body 11 and the third heating cylinder body 13, while low-frequency current cannot effectively penetrate, and high-frequency current has higher requirement on a circuit structure; the electrified coil 21 is of a water-through hollow wire structure so as to carry out water cooling during electrification work;
by adopting electromagnetic induction heating in a non-contact way, the electrothermal conversion rate can reach 96 percent, and besides, plasma heating and arc heating can also be adopted, but the efficiency is not as high as that of electromagnetic induction heating.
A discharging mechanism is arranged in the third heating cylinder 13, and the discharging mechanism is a horizontally arranged spiral pushing rod 22, the front end of the discharging mechanism is arranged corresponding to the calcining section 2, and the rear end of the discharging mechanism is arranged corresponding to the discharging port 14, and is used for horizontally pushing and discharging the calcined graphite product.
As shown in fig. 2, an exhaust channel 23 is connected to the exhaust port 17, and a sidewall structure of the exhaust channel 23 may be identical to that of the first heating cylinder 5, and sequentially includes a heating layer 7, a heat insulating layer 8 and a housing 9 from inside to outside, so as to achieve continuous heating and prevent the gasified impurities from condensing due to low temperature when being discharged through the exhaust channel 23, thereby preventing the exhaust channel from being blocked.
As shown in fig. 5, the exhaust channel 23 is further connected with a cyclone dust collector 24 for separating and collecting large particle impurities in the exhaust gas, which can be used as building raw materials; the cyclone dust collector 24 is also provided with a dust collecting cloth bag 25 for collecting dust impurities in the exhaust gas, so that the gas exhausted to the environment meets the environmental protection requirement.
Wherein, the device also comprises a supporting part 26, a riding wheel part 27, a driving mechanism (not shown in the figure) and a transmission structure; the supporting part 26 is fixedly arranged on the ground, the upper end of the supporting part 26 is used for being connected with the supporting wheel part 27 or the transmission structure, and the supporting wheel part 27 rotatably supports the second heating cylinder 11; the driving mechanism drives the second heating cylinder 11 to rotate through a transmission structure. The driving mechanism comprises a motor and a speed reducer, and the transmission structure comprises a gear transmission structure consisting of a pinion 28 and a gearwheel 29, and can also be a belt transmission structure; the specific structural forms of the driving mechanism and the transmission structure have various implementation schemes, which are well known by those skilled in the art, and thus the detailed description of the present application is omitted.
Compared with the prior art, the purification process is a continuous purification process at high temperature, the energy consumption can be reduced to 5000-7000 kWh/t, the continuous production quality is stable, the production efficiency is high, and the annual yield can reach 500-1200 t/a.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. The utility model provides a high temperature purification device of natural graphite which characterized in that:
comprises a feeding section, a calcining section and a discharging section which are sequentially communicated from front to back in the horizontal direction;
the feeding section comprises a first heating cylinder body, a feeding hole is formed in the first heating cylinder body, and a feeding mechanism is arranged in the first heating cylinder body;
the calcining section is provided with a rotary second heating cylinder body which is horizontally laid and rotates along the central line of the horizontal direction; the front end of the second heating cylinder is connected with the feeding mechanism of the feeding section, and the rear end of the second heating cylinder is connected with the discharging section; the feeding mechanism feeds the graphite raw material into a second heating cylinder, and the graphite raw material enters the discharging section after being heated and calcined by the second heating cylinder;
the discharging section comprises a third heating cylinder body, and a discharging hole is formed in the third heating cylinder body and used for discharging; the gas injection port is used for blowing and injecting protective gas into the device to form a forward moving gas flow in the third heating cylinder and the second heating cylinder;
the device is also provided with an exhaust port which is positioned at the front part of the calcining section and is upwards opened for exhausting waste gas generated during calcining.
2. The purifying apparatus of claim 1, wherein: the structure of the first heating cylinder body sequentially comprises a heating layer, a heat preservation layer and a shell from inside to outside when viewed from the cross section angle of the first heating cylinder body.
3. The purifying apparatus of claim 1, wherein: the structure composition of the second heating cylinder body and the third heating cylinder body sequentially comprises an electromagnetic induction heating layer, a heat preservation layer, an insulating layer and an electrified coil from inside to outside when viewed from the cross section angle.
4. The purifying apparatus of claim 1, wherein: a plurality of lifting plates are arranged on the inner wall of the second heating cylinder at intervals, and are arranged along the circumferential direction of the second heating cylinder and extend towards the inside of the second heating cylinder;
the outer end of the lifting plate is fixedly arranged on the inner wall of the second heating cylinder, a hook-shaped part is formed at the inner end of the lifting plate, and the hook-shaped part is arranged towards the rotation direction of the second heating cylinder.
5. The purifying apparatus of claim 1, wherein: an exhaust passage is connected with the exhaust port, and the side wall structure of the exhaust passage sequentially comprises a heating layer, a heat insulation layer and a shell from inside to outside.
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| CN109502579A (en) * | 2018-11-27 | 2019-03-22 | 苏州中材非金属矿工业设计研究院有限公司 | The technique of natural graphite alkali acid system purification |
| CN109231199A (en) * | 2018-11-27 | 2019-01-18 | 湖南顶立科技有限公司 | A kind of material purifying plant |
| CN111017922B (en) * | 2020-01-09 | 2022-04-12 | 成都理工大学 | Activation method of natural crystalline graphite fine powder for preparing high-purity graphite |
| CN114477164A (en) * | 2020-11-12 | 2022-05-13 | 石门县顺超科技发展有限公司 | Graphite purification device |
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| US2914383A (en) * | 1951-11-16 | 1959-11-24 | Graphitwerk Kropfmuhl Ag | Process of purifying graphite |
| CN207108495U (en) * | 2017-04-28 | 2018-03-16 | 福建凯昱微晶石墨有限公司 | A kind of micro crystal graphite purifying plant |
| CN107500269A (en) * | 2017-08-24 | 2017-12-22 | 中山国安火炬科技发展有限公司 | A kind of high temperature purification equipment of high-purity CNT or graphite powder and preparation method thereof |
| CN107522197A (en) * | 2017-09-15 | 2017-12-29 | 福建翔丰华新能源材料有限公司 | The method of the preparation high-purity of economy, the micro crystal graphite of high graphitization degree |
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| CN108529616A (en) | 2018-09-14 |
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