CN114812187A - Horizontal-vertical cooperative continuous graphitization process and device - Google Patents
Horizontal-vertical cooperative continuous graphitization process and device Download PDFInfo
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- CN114812187A CN114812187A CN202210426805.7A CN202210426805A CN114812187A CN 114812187 A CN114812187 A CN 114812187A CN 202210426805 A CN202210426805 A CN 202210426805A CN 114812187 A CN114812187 A CN 114812187A
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- heating
- graphite
- cylinder
- heat
- graphitization
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
- F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
Abstract
The invention relates to a horizontal-vertical cooperative continuous graphitization process and a device, wherein the device comprises a self-heating graphite tube rotary cylinder, an electric receiving electrode bar, an external heating heat-resistant steel rotary cylinder and a graphitization vertical furnace, the self-heating graphite tube rotary cylinder is connected with the external heating heat-resistant steel rotary cylinder in series, an inner cylinder of the self-heating graphite tube rotary cylinder is a graphite tube, two ends of the graphite tube are connected with electric slip rings and are electrified and heated through the electric receiving electrode bar, the inner cylinder of the external heating heat-resistant steel rotary cylinder is a heat-resistant steel cylinder, a feeding end of the heat-resistant steel cylinder is connected with a charging fixed end, a discharging end of the self-heating graphite tube rotary cylinder is connected with a discharging fixed end, and the graphitization vertical furnace is arranged below the discharging fixed end and is connected with a discharging port of the discharging fixed end. The invention has the beneficial effects that: the coating, low-temperature carbonization, high-temperature carbonization and graphitization of the carbon material are collected in a set of device for cooperative continuous production, so that the electricity is saved, the environment is protected, the yield is high, and the quality is high.
Description
Technical Field
The invention relates to industrial furnace equipment, in particular to a horizontal and vertical cooperative continuous graphitization process and a device.
Background
In the production process of the graphite cathode material of the battery, multiple sets of equipment and production processes are required, all the processes cannot be continuously carried out, petroleum coke or pitch coke is adopted for coating, low-temperature carbonization, high-temperature carbonization and graphitization at present and is finished in different equipment, heating and cooling are required for multiple times, the energy consumption is high, and the pollution is serious.
The main technical difficulties in the prior art are as follows: the coated petroleum coke or asphalt coke contains a large amount of volatile components, graphitization cannot be carried out in one step, otherwise the performance of a coating material can be damaged, the two large amounts of volatile components are quickly separated out to form a furnace spraying accident, the three low-temperature carbonization and the high-temperature carbonization are integrated and put in one device together, so that great difficulty is brought, and the continuous graphitization is limited by materials, particularly powder, which do not undergo high-temperature carbonization, so that a shed furnace, a blocked furnace and a sprayed furnace can be caused.
Disclosure of Invention
The invention aims to provide a horizontal and vertical synergic continuous graphitization process and a device, which converge the coating, low-temperature carbonization, high-temperature carbonization and graphitization of a carbon material into a set of device for synergic continuous production and realize electricity saving, environmental protection, high yield and high quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a continuous graphitization technology in cooperation with lying and standing, adopts horizontal rotary heating furnace and graphitization vertical furnace to produce in coordination, horizontal rotary heating furnace is that low temperature region and high temperature region two parts are established ties, and the high temperature region ejection of compact is sent into graphitization vertical furnace, specifically includes:
1) the low-temperature zone adopts a heat-resistant steel roller form to carry out external heating to complete the coating and low-temperature carbonization of the carbon material, and the heating temperature range is adjustable from room temperature to 1000 ℃;
2) the high temperature zone adopts a graphite tube rotary drum to be electrified for self-heating, the heating temperature range is adjustable from 500 ℃ to 1700 ℃, and the high temperature carbonization and graphitization of the carbon material and the high temperature carbonization after the secondary coating of the graphitized material are carried out;
3) the low-temperature area and the high-temperature area are integrally inclined, the materials are conveyed to the graphitization vertical furnace by the rotary conveying power, and the materials fall into the graphitization vertical furnace by the gravity;
4) the anode and the cathode of the vertical graphitizing furnace are made of graphite materials, an annular channel is formed between the anode and the cathode, and the carbon materials carbonized and pre-graphitized in a high-temperature zone are used as resistance materials to realize continuous heating between the anode and the cathode, wherein the maximum heating temperature is 3000 ℃.
The integral inclination angle of the low-temperature area and the high-temperature area is 1-5 degrees, and the transmission device adopts frequency conversion speed regulation.
The utility model provides a device that continuous graphitization technology adopted in cooperation of lying and standing, includes self-heating graphite pipe revolving drum, receives the electric electrode bar, external heating heat-resistant steel revolving drum, graphitization vertical furnace, self-heating graphite pipe revolving drum with external heating heat-resistant steel revolving drum establishes ties, the inner tube of self-heating graphite pipe revolving drum is the graphite pipe, the electrical slip ring is connected at the both ends of graphite pipe to through receiving electric electrode bar ohmic heating, the inner tube of external heating heat-resistant steel revolving drum is heat-resistant steel drum, the charge stiff end is connected to the feeding one end of heat-resistant steel drum, ejection of compact stiff end is connected to the ejection of compact one end of self-heating graphite pipe revolving drum, graphitization vertical furnace sets up the below of ejection of compact stiff end to be connected with the discharge gate of ejection of compact stiff end.
The graphitization vertical furnace comprises an inner graphite column, an outer graphite barrel and a material cooler, wherein the inner graphite column and the outer graphite barrel form an annular channel, the inner graphite column and the outer graphite barrel form an electrode respectively, the annular channel is communicated with a discharge port of a discharge fixed end, a discharge pipe is arranged at the bottom of the annular channel, the material cooler is arranged at the lower part of the discharge pipe, and a heat insulation layer and a supporting device are arranged outside the outer graphite barrel.
The discharge fixed end comprises a steel structure shell, a fire-resistant heat-insulating material layer, a gate valve and a discharge chute, the steel structure shell is wrapped outside the fire-resistant heat-insulating material layer, a discharge cavity is formed inside the fire-resistant heat-insulating material layer, the discharge end of the self-heating graphite tube rotary cylinder is inserted into the discharge cavity, the gate valve and the discharge chute are arranged at the bottom of the discharge cavity, and a discharge port of the discharge chute is connected with the graphitization vertical furnace.
The stiff end of feeding includes steel construction casing, fire-resistant thermal insulation material layer, screw feeder, steel construction casing parcel is in the outside on fire-resistant thermal insulation material layer, the inside feeding chamber that is of fire-resistant thermal insulation material layer, the feed end of heat-resisting steel cylinder inserts in the feeding chamber, the feed end of heat-resisting steel cylinder is connected to the screw feeder.
And a sealing device is arranged between the heat-resistant steel cylinder and the charging fixed end, and a sealing device is arranged between the spontaneous heating graphite pipe rotary cylinder and the discharging fixed end.
Sealing device includes flexible sealing washer, graphite sealing washer, outer fixed tube, interior sealed tube, sealed aligning device, interior sealed tube passes through sealed aligning device and connects spontaneous heating graphite pipe revolving cylinder or heat-resisting steel cylinder it is provided with the flexible sealing washer of multilayer to extend the axial between interior sealed tube and the outer fixed tube, sets up the graphite sealing washer at the inboard of the flexible sealing washer of multilayer, outer fixed tube connects ejection of compact stiff end or the stiff end of feeding.
The sealing aligning device comprises a distance adjusting lead screw and a corrugated expander, the self-heating graphite tube rotary cylinder or the heat-resisting steel cylinder is connected with the inner sealing tube through the distance adjusting lead screw, and the corrugated expander used for sealing is further arranged between the self-heating graphite tube rotary cylinder or the heat-resisting steel cylinder and the inner sealing tube.
The self-heating graphite tube rotary drum comprises a graphite tube, a fireproof insulating material layer wrapped outside the graphite tube, and a steel shell fixed outside the fireproof insulating material layer.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a horizontal-vertical collaborative continuous graphitization process and a device, which converge coating, low-temperature carbonization, high-temperature carbonization and graphitization of carbon materials into a set of device for collaborative continuous production, and realize electricity saving, environmental protection, high yield and high quality.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1-charging system, 2-charging fixed end, 3-heat-resistant steel cylinder, 4-transmission device, 5-powered electrode bar, 6-electric slip ring, 7-graphite pipe, 8-discharging fixed end, 9-discharging chute, 10-inner graphite column, 11-outer graphite cylinder, 12-heat insulation layer and supporting device, 13-material cooler, 14-vertical furnace sealing rotary discharger, 15-supporting roller, 16-spiral feeder, 17-flexible sealing ring, 18-graphite sealing ring, 19-distance adjusting screw rod and 20-ripple expander. 21-electrode.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
referring to fig. 1, a horizontal and vertical continuous graphitization process adopts a horizontal rotary heating furnace and a graphitization vertical furnace for cooperative production, wherein the horizontal rotary heating furnace is formed by connecting a low temperature region and a high temperature region in series, and the high temperature region discharges materials and sends the materials into the graphitization vertical furnace, and the process specifically comprises the following steps:
1) the low-temperature zone adopts a heat-resistant steel roller form to carry out external heating to complete the coating and low-temperature carbonization of the carbon material, and the heating temperature range is adjustable from room temperature to 1000 ℃;
2) the high temperature zone adopts a graphite tube rotary drum to be electrified for self-heating, the heating temperature range is adjustable from 500 ℃ to 1700 ℃, and the high temperature carbonization and graphitization of the carbon material and the high temperature carbonization after the secondary coating of the graphitized material are carried out;
3) the low-temperature area and the high-temperature area are integrally inclined, the materials are conveyed to the graphitization vertical furnace by the rotary conveying power, and the materials fall into the graphitization vertical furnace by gravity;
4) the anode and the cathode of the vertical graphitizing furnace are made of graphite materials, an annular channel is formed between the anode and the cathode, and the carbon materials carbonized and pre-graphitized in a high-temperature zone are used as resistance materials to realize continuous heating between the anode and the cathode, wherein the maximum heating temperature is 3000 ℃.
The integral inclination angle of the low temperature area and the high temperature area is 1-5 degrees, and the transmission device 4 adopts frequency conversion speed regulation.
A device adopted by a horizontal-vertical synergic continuous graphitization process comprises a self-heating graphite tube rotary cylinder, an electric-receiving electrode bar 5, an external-heating heat-resistant steel rotary cylinder and a graphitization vertical furnace, the self-heating graphite tube rotary drum is connected with the external heating heat-resistant steel rotary drum in series, the inner cylinder of the self-heating graphite tube rotary drum is a graphite tube 7, two ends of the graphite tube 7 are connected with an electric slip ring 6, and is electrified and heated by an electric electrode bar 5, the inner cylinder of the external heating heat-resistant steel rotary cylinder is a heat-resistant steel cylinder 3, the heat-resistant steel cylinder 3 is connected with a graphite pipe 7 by an insulating flange, the feeding end of the heat-resistant steel cylinder 3 is connected with the charging fixed end 2, the discharging end of the self-heating graphite tube revolving cylinder is connected with the discharging fixed end 8, the graphitization vertical furnace is arranged below the discharge fixed end 8 and is connected with a discharge hole of the discharge fixed end 8.
The two ends of the high-temperature region graphite tube 7 adopt the current-receiving electrode bar 5 and the electric slip ring 6 to transmit electricity into the graphite tube 7, the graphite tube 7 generates heat by self under the action of current, and the graphite can bear the high temperature of more than 3000 ℃ under the condition of air isolation, so the graphite revolving drum can bear the high temperature of more than 2000 ℃.
The graphitization vertical furnace comprises an inner graphite column 10, an outer graphite barrel 11 and a material cooler 13, the inner graphite column 10 and the outer graphite barrel 11 form an annular channel, the inner graphite column 10 and the outer graphite barrel 11 are respectively connected with an electrode 21, the annular channel is communicated with a discharge port of the discharge fixed end 8, the bottom of the annular channel is a discharge pipe, the lower part of the discharge pipe is provided with the material cooler 13, and the outer graphite barrel 11 is externally provided with a heat insulation layer and a supporting device 12.
The discharging fixed end 8 comprises a steel structure shell, a fire-resistant heat-insulating material layer, a gate valve and a discharging chute 9, the steel structure shell is wrapped outside the fire-resistant heat-insulating material layer, a discharging cavity is formed inside the fire-resistant heat-insulating material layer, the discharging end of the self-heating graphite tube rotary cylinder is inserted into the discharging cavity, the gate valve and the discharging chute 9 are arranged at the bottom of the discharging cavity, and a discharging port of the discharging chute 9 is connected with the graphitization vertical furnace.
The charge fixed end 2 comprises a steel structure shell, a fire-resistant heat insulation material layer and a spiral feeder 16, the steel structure shell is wrapped outside the fire-resistant heat insulation material layer, a feed cavity is formed inside the fire-resistant heat insulation material layer, the feed end of the heat-resistant steel cylinder 3 is inserted into the feed cavity, and the spiral feeder 16 is connected with the feed end of the heat-resistant steel cylinder 3.
The spiral feeder 16 extends into the feeding cavity from the side surface of the charging fixed end 2 to be connected with the heat-resistant steel cylinder 3, and a corrugated compensator is arranged between the part of the spiral feeder 16 outside the charging fixed end 2 and used for feeding and sealing. The feed inlet of the screw feeder 16 is connected with the feeding system 1.
A sealing device is arranged between the heat-resistant steel cylinder 3 and the charging fixed end 2, and a sealing device is arranged between the self-heating graphite tube rotary cylinder and the discharging fixed end 8.
Sealing device includes flexible sealing washer 17, graphite sealing washer 18, outer fixed tube, interior sealed tube, sealed aligning device, interior sealed tube passes through sealed aligning device and connects self-heating graphite pipe rotary drum or heat-resisting steel cylinder 3 extend the axial between interior sealed tube and the outer fixed tube and be provided with multilayer flexible sealing washer 17, set up graphite sealing washer 18 at multilayer flexible sealing washer 17's innermost side, outer fixed tube connection ejection of compact stiff end 8 or charge stiff end 2.
The sealing and aligning device comprises a distance adjusting lead screw 19 and a corrugated expander 20, the self-heating graphite tube rotary cylinder or the heat-resisting steel cylinder 3 is connected with the inner sealing tube through the distance adjusting lead screw 19, and the corrugated expander 20 used for sealing is further arranged between the self-heating graphite tube rotary cylinder or the heat-resisting steel cylinder 3 and the inner sealing tube.
The sealing device adjusts the concentricity with the self-heating graphite tube rotary cylinder or the heat-resisting steel cylinder 3 through the sealing aligning device.
The middle of the distance-adjusting screw rod 19 is provided with a nut, the two ends of the distance-adjusting screw rod are provided with screw rods with positive and negative threads, the length of the distance-adjusting screw rod is adjusted by screwing the nut, so that the radial distance between the inner sealing tube and the self-heating graphite tube rotary cylinder or the external heating heat-resistant steel rotary cylinder is adjusted, the concentricity of the sealing surface cylinder and the rotary kiln is achieved through the adjustment of the screw rods in the circumferential direction, and the corrugated expander 20 plays a role in sealing the inside and the outside of the kiln and can provide position compensation during debugging.
After the self-heating graphite tube rotary cylinder or the external heating heat-resistant steel rotary cylinder is installed in place, the manual sealing surface is aligned, namely the concentricity of the sealing device and the rotary cylinder is debugged, the distance adjusting lead screws 19 play a role in adjusting the concentricity and supporting the sealing device, the purpose of aligning during construction and debugging is achieved, and after the adjustment is finished, the external fixing tube is fixedly connected with the charging fixed end 2 or the discharging fixed end 8 through bolts.
The self-heating graphite tube rotary drum comprises a graphite tube 7, a fireproof insulating material layer wrapped outside the graphite tube 7, and a steel shell fixed outside the fireproof insulating material layer.
The horizontal rotary heating furnace part adopts a low-temperature area and a high-temperature area which are connected in series and integrated into a set of rotary heating treatment furnace, a downward inclination angle is formed from a charging end to a discharging end, the downward inclination angle is generally 1-5 degrees, a transmission device 4 adopts variable frequency speed regulation, and the material quantity passing through the furnace can be automatically regulated. The low temperature zone adopts a roller made of heat-resistant steel to carry out external heating, can finish coating and low temperature carbonization of the carbon material, the heating temperature range can be adjusted from room temperature to 1000 ℃, the high temperature zone adopts a graphite tube rotary drum to be electrified for self-heating, the heating temperature range can be adjusted from 500 ℃ to 1700 ℃, and the high temperature carbonization of the carbon material after high temperature carbonization and secondary coating of the graphitized material can be carried out. The graphitizing furnace adopts a vertical furnace, and the material is conveyed by gravity and is connected to the lower part of the discharge port of the horizontal rotary furnace to work with the rotary heating furnace. The high-temperature material carbonized at high temperature in the horizontal rotary kiln is directly added into the vertical graphitizing furnace through a feeding chute, the anode and the cathode of the vertical graphitizing furnace are made of graphite materials, an annular channel is formed between the anode and the cathode, the carbon material pre-graphitized by high-temperature carbonization is used as a resistance material between the anode and the cathode to realize continuous heating, the material temperature can be heated to 2800-3000 ℃, the heat is preserved for 10-30 minutes to realize the graphitization of the carbon material, and the material quantity in the vertical furnace is adjusted through the vertical furnace sealing rotary discharger 14 to realize the cooperation with the horizontal rotary furnace. The lower part blanking pipe of the graphitizing vertical furnace is provided with a dividing wall type cooler, the graphitized material is discharged out of the furnace through a rotary vertical furnace sealing rotary discharger 14 after being cooled, and the continuous production process of cladding, low-temperature carbonization, high-temperature carbonization and graphitization is completed.
Claims (10)
1. The horizontal rotary heating furnace and the graphitization vertical furnace are cooperatively produced, the horizontal rotary heating furnace is formed by connecting a low-temperature area and a high-temperature area in series, and the high-temperature area discharges materials to be sent into the graphitization vertical furnace, and the process specifically comprises the following steps:
1) the low-temperature area is externally heated in a heat-resistant steel roller mode, and the heating temperature range is from room temperature to 1000 ℃;
2) the high temperature zone adopts a graphite tube rotary cylinder to be electrified for self-heating, and the heating temperature range is from 500 ℃ to 1700 ℃;
3) the low-temperature area and the high-temperature area are integrally inclined, the materials are conveyed to the graphitization vertical furnace by the rotary conveying power, and the materials fall into the graphitization vertical furnace by gravity;
4) the anode and the cathode of the vertical graphitizing furnace are made of graphite materials, an annular channel is formed between the anode and the cathode, and the carbon materials carbonized and pre-graphitized in a high-temperature zone are used as resistance materials to realize continuous heating between the anode and the cathode, wherein the maximum heating temperature is 3000 ℃.
2. The process of claim 1, wherein the overall inclination angle of the low-temperature region and the high-temperature region is 1-5 °, and the transmission device adopts variable-frequency speed regulation.
3. The apparatus of claim 1 or 2, comprising a self-heating graphite tube rotary drum, a power-receiving electrode rod, an external heating heat-resistant steel rotary drum, and a graphitization vertical furnace, wherein the self-heating graphite tube rotary drum is connected in series with the external heating heat-resistant steel rotary drum, the inner cylinder of the self-heating graphite tube rotary drum is a graphite tube, two ends of the graphite tube are connected with electrical slip rings and are heated by the power-receiving electrode rod, the inner cylinder of the external heating heat-resistant steel rotary drum is a heat-resistant steel drum, the feeding end of the heat-resistant steel drum is connected with a charging fixed end, the discharging end of the self-heating graphite tube rotary drum is connected with a discharging fixed end, and the graphitization vertical furnace is arranged below the discharging fixed end and is connected with the discharging port of the discharging fixed end.
4. The apparatus according to claim 3, wherein the vertical graphitization furnace comprises an inner graphite column, an outer graphite cylinder and a material cooler, the inner graphite column and the outer graphite cylinder form an annular channel, the inner graphite column and the outer graphite cylinder are respectively connected with electrodes, the annular channel is communicated with a discharge port of the discharge fixing end, a blanking pipe is arranged at the bottom of the annular channel, the material cooler is arranged at the lower part of the blanking pipe, and a heat insulation layer and a supporting device are arranged outside the outer graphite cylinder.
5. The device for the horizontal and vertical coordinated continuous graphitization process according to claim 3, wherein the discharge fixed end comprises a steel structure shell, a fire-resistant heat insulation material layer, a gate valve and a discharge chute, the steel structure shell is wrapped outside the fire-resistant heat insulation material layer, a discharge cavity is arranged inside the fire-resistant heat insulation material layer, the discharge end of the self-heating graphite pipe rotary cylinder is inserted into the discharge cavity, the gate valve and the discharge chute are arranged at the bottom of the discharge cavity, and a discharge port of the discharge chute is connected with the graphitization vertical furnace.
6. The device for the horizontal and vertical coordinated continuous graphitization process according to claim 3, wherein the fixed end of the charge material comprises a steel structure shell, a fire-resistant heat insulation material layer and a spiral feeder, the steel structure shell is wrapped outside the fire-resistant heat insulation material layer, a feed cavity is arranged inside the fire-resistant heat insulation material layer, the feed end of the heat-resistant steel cylinder is inserted into the feed cavity, and the spiral feeder is connected with the feed end of the heat-resistant steel cylinder.
7. The apparatus for the horizontal and vertical coordinated continuous graphitization process according to claim 3, wherein a sealing device is arranged between the heat-resistant steel cylinder and the charging fixed end, and a sealing device is arranged between the self-heating graphite tube rotary cylinder and the discharging fixed end.
8. The apparatus according to claim 7, wherein the sealing device comprises a flexible sealing ring, a graphite sealing ring, an outer fixing tube, an inner sealing tube, and a sealing and aligning device, the inner sealing tube is connected to the self-heating graphite tube rotary cylinder or the heat-resistant steel cylinder through the sealing and aligning device, a plurality of layers of flexible sealing rings are axially arranged between the inner sealing tube and the outer fixing tube, the graphite sealing ring is arranged at the innermost side of the plurality of layers of flexible sealing rings, and the outer fixing tube is connected to the discharging fixing end or the charging fixing end.
9. The device adopted by the horizontal and vertical collaborative continuous graphitization process according to claim 8, wherein the sealing and aligning device comprises a distance adjusting lead screw and a corrugated expander, the self-heating graphite tube rotary cylinder or the heat-resistant steel cylinder is connected with the inner sealing tube through the distance adjusting lead screw, and the corrugated expander for sealing is further arranged between the self-heating graphite tube rotary cylinder or the heat-resistant steel cylinder and the inner sealing tube.
10. The apparatus of claim 3, wherein the self-heating graphite tube rotary drum comprises a graphite tube, a fire-resistant insulating material layer wrapped outside the graphite tube, and a steel shell fixed outside the fire-resistant insulating material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210426805.7A CN114812187A (en) | 2022-04-22 | 2022-04-22 | Horizontal-vertical cooperative continuous graphitization process and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210426805.7A CN114812187A (en) | 2022-04-22 | 2022-04-22 | Horizontal-vertical cooperative continuous graphitization process and device |
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| Publication Number | Publication Date |
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| CN114812187A true CN114812187A (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210426805.7A Pending CN114812187A (en) | 2022-04-22 | 2022-04-22 | Horizontal-vertical cooperative continuous graphitization process and device |
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| CN (1) | CN114812187A (en) |
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2022
- 2022-04-22 CN CN202210426805.7A patent/CN114812187A/en active Pending
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