CN110642248A - Production method of fine-structure high-purity graphite with changed molecular arrangement combination - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000010439 graphite Substances 0.000 title claims abstract description 34
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 64
- 239000000843 powder Substances 0.000 claims abstract description 47
- 239000000203 mixture Substances 0.000 claims abstract description 33
- 239000000571 coke Substances 0.000 claims abstract description 13
- 238000005087 graphitization Methods 0.000 claims abstract description 13
- 239000002006 petroleum coke Substances 0.000 claims abstract description 13
- 239000010426 asphalt Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000011300 coal pitch Substances 0.000 claims abstract description 6
- 235000011837 pasties Nutrition 0.000 claims abstract description 6
- 238000001291 vacuum drying Methods 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 21
- 238000012216 screening Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000011294 coal tar pitch Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000460 chlorine Substances 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 239000006253 pitch coke Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011280 coal tar Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000007770 graphite material Substances 0.000 description 2
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011334 petroleum pitch coke Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
A method for producing fine-structure high-purity graphite by changing molecular arrangement combination comprises the steps of grinding petroleum coke or asphalt coke to obtain first prefabricated micro powder, mixing the first prefabricated micro powder with coal pitch to obtain pasty first mixture, carrying out vacuum drying on the first mixture to obtain second mixture, grinding the second mixture to obtain second prefabricated micro powder, roasting the second prefabricated micro powder at high pressure to obtain a roasted product, grinding the roasted product to obtain third prefabricated micro powder, and graphitizing the third prefabricated micro powder in a graphitization furnace to obtain the finished product graphite. The purity and the strength of the finished product graphite prepared by the method are very high, the preparation process is simple, the cost is relatively low, the molecular arrangement combination of the prepared finished product graphite can be changed, and the application range of the prepared finished product graphite is wider.
Description
Technical Field
The invention belongs to the technical field of graphite production, and particularly relates to a method for producing fine-structure high-purity graphite by changing molecular arrangement combination.
Background
Graphite is an allotrope of carbon, has stable chemical properties and corrosion resistance, is not easy to react with medicaments such as acid, alkali and the like, and can be combusted in oxygen at 687 ℃ to generate carbon dioxide. Graphite can be oxidized by strong oxidant such as concentrated nitric acid, potassium permanganate, etc., and can be used as antiwear agent, lubricant, and high-purity graphite is used as neutron moderator in atomic reactor, and can also be used for manufacturing crucible, electrode, brush, dry battery, graphite fiber, heat exchanger, cooler, arc furnace, arc lamp, pencil lead, etc.
The petroleum coke is black solid coke generated by cracking and coking vacuum residue oil of petroleum at the temperature of 550 ℃ by a coking device, the appearance of the black solid coke is a black or dark gray honeycomb structure, the pores in the coke block are mostly oval and are communicated with each other, the coke block is generally regarded as an amorphous carbon body, or a highly aromatized high polymer carbide contains a carbon body with a needle-shaped or granular structure of tiny graphite crystals, the carbon-hydrogen ratio is high and is 18-24, the relative density is 0.9-1.1, the ash content is 0.1-1.2%, and the volatile matter is 3-16%; the pitch coke is a solid residue obtained after high-temperature dry distillation or delayed coking of coal pitch; coal tar pitch is the residue after liquid fraction is removed by distillation in the process of processing coal tar, the coal tar pitch is the main component of the coal tar, accounts for about 50-60% of the total amount, the main component is generally considered to be polycyclic and polycyclic aromatic hydrocarbon and derivatives thereof, the specific compound composition is quite complex, the difference of raw coal types and processing techniques can also cause component difference, the existing method is mainly distinguished according to the softening temperature shown by the raw coal types and the processing techniques, generally, at room temperature, coal pitch is black brittle block-shaped substance, has luster and odor, is easy to burn when being melted, is toxic, has low temperature stability of coal tar pitch, good adhesion with mineral aggregate and poor weather stability (large cold and hot change), and the compound contains more harmful components to human bodies, particularly carcinogenic polycyclic aromatic hydrocarbons such as benzopyrene, and the like, and is one of the main sources of the pollutants in the environment.
The invention Chinese patent CN108218429A discloses a method for preparing a high-purity graphite material by using high-temperature coal pitch as a raw material, although the graphite material prepared by the method has high purity, fine and compact structure and good mechanical property, in the method, petroleum coke and pitch coke are calcined at 1350 ℃ and 1400 ℃ to obtain forged petroleum coke and forged pitch coke, and then the forged petroleum coke, the forged pitch coke and the high-temperature coal pitch are mixed and crushed, so that the preparation process is complicated and the cost is high, a sulfuric acid solution is required to be added into a mixture D for mixing treatment to obtain a mixture E, and then the mixture E is required to be washed to be neutral by purified water, so that the sulfuric acid wastewater generated in the process has high corrosivity and can pollute the environment.
Disclosure of Invention
The invention provides a method for producing fine-structure high-purity graphite by changing molecular arrangement combination, the purity and the strength of the prepared finished product graphite are very high, the preparation process is simple, the cost is relatively low, the molecular arrangement combination of the prepared finished product graphite can be changed, and the application range of the prepared finished product graphite is wider.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for producing fine-structure high-purity graphite by changing molecular arrangement combination comprises the following steps:
(1) grinding petroleum coke or asphalt coke in a grinding machine, and removing oversize products after screening, wherein the undersize products are first prefabricated micro powder with proper particle size, and the oversize products continuously return to the grinding machine for grinding;
(2) mixing the first prefabricated micro powder obtained in the step (1) with coal tar pitch according to a certain proportion and uniformly stirring to obtain a pasty first mixture;
(3) placing the first mixture obtained in the step (2) in a vacuum drier for vacuum drying for a period of time to obtain a dried second mixture, and cooling the second mixture in the drier for later use;
(4) grinding the cooled second mixture obtained in the step (3) in a grinding machine, and removing oversize products after screening, wherein the undersize products are second prefabricated micro powder with proper particle size, and the oversize products continue to return to the grinding machine for grinding;
(5) placing the second prefabricated micro powder in the step (4) into a high-pressure roasting furnace, firstly evacuating air in the high-pressure roasting furnace, then introducing nitrogen into the high-pressure roasting furnace, adjusting the pressure of the nitrogen to 2.5-3MPa, heating to 380-420 ℃ at the heating rate of 18-20 ℃/min, preserving heat for 3-3.5h, and naturally cooling to obtain a roasted product;
(6) grinding the roasted product obtained in the step (5) in a grinding machine, and removing oversize products after screening, wherein the undersize products are third prefabricated micro powder with proper particle size, and the oversize products continuously return to the grinding machine for grinding;
(7) putting the third prefabricated micro powder in the step (6) into a graphitization furnace, firstly evacuating the air in the graphitization furnace, then rapidly heating up to 7-8m when the temperature is raised to 1900-2100 DEG C3Continuously introducing chlorine at a flow rate of 1-1.5m when the temperature is raised to 2800-3000 ℃, keeping the temperature at 1900-3Continuously introducing chlorine gas at a flow rate of/h, preserving the heat for 1-1.5h at 2800-.
Further, in the step (1), the particle size of the first premade micro powder is 6-10 μm.
Further, in the step (2), the mass ratio of the coal tar pitch to the first prefabricated micro powder is 0.2-0.3: 1.
further, in the step (3), the vacuum degree of the vacuum dryer is adjusted to be 0.07-0.1MPa, the heating temperature of the vacuum dryer is 250-300 ℃, and the drying time is 8-10 h.
Further, in the step (4), the particle size of the second preform fine powder is 6 to 10 μm.
Further, in the step (6), the particle size of the third preform fine powder is 6 to 10 μm.
Further, in the step (7), the purity of the prepared finished product graphite is as high as 99.999%.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the petroleum coke or the asphalt coke is directly ground in a grinding machine and screened to obtain first prefabricated micro powder, then the first prefabricated micro powder is mixed with the coal asphalt, and the petroleum coke or the asphalt coke is not required to be calcined at 1350 ℃ and 1400 ℃ to obtain forged petroleum coke or forged asphalt coke, so that the preparation process is simple and the cost is relatively low;
secondly, in the step (5), the second prefabricated micro powder in the step (4) is placed into a high-pressure roasting furnace, air in the high-pressure roasting furnace is firstly exhausted, then nitrogen is introduced into the high-pressure roasting furnace, the pressure of the nitrogen is adjusted to 2.5-3MPa, the temperature is increased to 380-;
thirdly, in the step (7) of the invention, the third prefabricated micro powder in the step (6) is put into a graphitization furnace, the air in the graphitization furnace is firstly evacuated, then the temperature is rapidly raised, and when the temperature is raised to 1900-2100 ℃, the thickness is 7-8m3Continuously introducing chlorine at a flow rate of 1-1.5m when the temperature is raised to 2800-3000 ℃, keeping the temperature at 1900-3Chlorine is continuously introduced at the flow rate of/h, the temperature is kept at 2800-.
Detailed Description
Example 1
A method for producing fine-structure high-purity graphite by changing molecular arrangement combination comprises the following steps:
(1) grinding petroleum coke or asphalt coke in a grinding machine, and removing oversize products after screening, wherein the undersize products are first prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continuously return to the grinding machine for grinding;
(2) mixing the first prefabricated micro powder obtained in the step (1) with coal tar pitch in a mass ratio of 0.2:1, and uniformly stirring to obtain a pasty first mixture;
(3) placing the first mixture obtained in the step (2) in a vacuum drier for vacuum drying for a period of time to obtain a dried second mixture, and cooling the second mixture in a drier for later use, wherein the vacuum degree of the vacuum drier is adjusted to be 0.07MPa, the heating temperature of the vacuum drier is 250 ℃, and the drying time is 10 hours;
(4) grinding the cooled second mixture obtained in the step (3) in a grinding machine, and removing oversize products after screening, wherein the undersize products are second prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continue to return to the grinding machine for grinding;
(5) placing the second prefabricated micro powder in the step (4) into a high-pressure roasting furnace, firstly evacuating air in the high-pressure roasting furnace, then introducing nitrogen into the high-pressure roasting furnace, adjusting the pressure of the nitrogen to 3MPa, heating to 380 ℃ at the heating rate of 18 ℃/min, preserving heat for 3.5 hours, and naturally cooling to obtain a roasted product;
(6) grinding the roasted product in the step (5) in a grinding machine, and removing oversize products after screening, wherein the undersize products are third prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continuously return to the grinding machine for grinding;
(7) putting the third prefabricated micro powder in the step (6) into a graphitization furnace, firstly evacuating the air in the graphitization furnace, then rapidly heating up to 8m when the temperature is raised to 1900 DEG C3Continuously introducing chlorine gas at a flow rate of/h, keeping the temperature of 1900 ℃ for 3h, stopping introducing the chlorine gas, then rapidly heating, and increasing the temperature to 3000 ℃ by 1m3Continuously introducing chlorine gas at a flow rate of/h, preserving heat for 1h at 3000 ℃, and naturally cooling to obtain the finished product graphite with the purity of 99.999 percent.
Example 2
A method for producing fine-structure high-purity graphite by changing molecular arrangement combination comprises the following steps:
(1) grinding petroleum coke or asphalt coke in a grinding machine, and removing oversize products after screening, wherein the undersize products are first prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continuously return to the grinding machine for grinding;
(2) mixing the first prefabricated micro powder obtained in the step (1) with coal tar pitch in a mass ratio of 0.25:1, and uniformly stirring to obtain a pasty first mixture;
(3) placing the first mixture obtained in the step (2) in a vacuum drier for vacuum drying for a period of time to obtain a dried second mixture, and cooling the second mixture in a drier for later use, wherein the vacuum degree of the vacuum drier is adjusted to be 0.08MPa, the heating temperature of the vacuum drier is 270 ℃, and the drying time is 9 hours;
(4) grinding the cooled second mixture obtained in the step (3) in a grinding machine, and removing oversize products after screening, wherein the undersize products are second prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continue to return to the grinding machine for grinding;
(5) placing the second prefabricated micro powder in the step (4) into a high-pressure roasting furnace, firstly evacuating air in the high-pressure roasting furnace, then introducing nitrogen into the high-pressure roasting furnace, adjusting the pressure of the nitrogen to 2.7MPa, heating to 400 ℃ at a heating rate of 19 ℃/min, preserving heat for 3.2 hours, and naturally cooling to obtain a roasted product;
(6) grinding the roasted product in the step (5) in a grinding machine, and removing oversize products after screening, wherein the undersize products are third prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continuously return to the grinding machine for grinding;
(7) putting the third prefabricated micro powder in the step (6) into a graphitization furnace, firstly evacuating the air in the graphitization furnace, then rapidly heating up, and when the temperature is raised to 2000 ℃, heating up to 7.5m3Continuously introducing chlorine gas at a flow rate of 1.2m when the temperature is raised to 2900 ℃, keeping the temperature at 2000 ℃ for 2.5h, stopping introducing chlorine gas, and then rapidly raising the temperature3Continuously introducing chlorine gas at a flow rate of/h, preserving heat for 1.3h at 2900 ℃, and naturally cooling to obtain finished graphite with the purity of 99.999%.
Example 3
A method for producing fine-structure high-purity graphite by changing molecular arrangement combination comprises the following steps:
(1) grinding petroleum coke or asphalt coke in a grinding machine, and removing oversize products after screening, wherein the undersize products are first prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continuously return to the grinding machine for grinding;
(2) mixing the first prefabricated micro powder obtained in the step (1) with coal tar pitch in a mass ratio of 0.3:1, and uniformly stirring to obtain a pasty first mixture;
(3) placing the first mixture obtained in the step (2) in a vacuum drier for vacuum drying for a period of time to obtain a dried second mixture, and cooling the second mixture in a drier for later use, wherein the vacuum degree of the vacuum drier is adjusted to be 0.1MPa, the heating temperature of the vacuum drier is 300 ℃, and the drying time is 8 hours;
(4) grinding the cooled second mixture obtained in the step (3) in a grinding machine, and removing oversize products after screening, wherein the undersize products are second prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continue to return to the grinding machine for grinding;
(5) placing the second prefabricated micro powder in the step (4) into a high-pressure roasting furnace, firstly evacuating air in the high-pressure roasting furnace, then introducing nitrogen into the high-pressure roasting furnace, adjusting the pressure of the nitrogen to 2.5MPa, heating to 420 ℃ at the heating rate of 20 ℃/min, preserving heat for 3 hours, and naturally cooling to obtain a roasted product;
(6) grinding the roasted product in the step (5) in a grinding machine, and removing oversize products after screening, wherein the undersize products are third prefabricated micro powder with the particle size of 6-10 mu m, and the oversize products continuously return to the grinding machine for grinding;
(7) putting the third prefabricated micro powder in the step (6) into a graphitization furnace, firstly evacuating the air in the graphitization furnace, then rapidly heating up, and when the temperature is raised to 2100 ℃, heating up to 7m3The chlorine gas is continuously introduced at a flow rate of/h, the temperature is kept at 2100 ℃ for 2h, then the introduction of the chlorine gas is stopped, the temperature is rapidly increased again, and when the temperature is increased to 2800 ℃, the chlorine gas is introduced at a flow rate of 1.5m3Continuously introducing chlorine gas at the flow rate of/h, preserving the heat at 2800 ℃ for 1.5h, and naturally cooling to obtain the finished product of graphite with the purity as high as 99.999%.
Claims (7)
1. A method for producing fine-structure high-purity graphite by changing molecular arrangement combination is characterized by comprising the following steps:
(1) grinding petroleum coke or asphalt coke in a grinding machine, and removing oversize products after screening, wherein the undersize products are first prefabricated micro powder with proper particle size, and the oversize products continuously return to the grinding machine for grinding;
(2) mixing the first prefabricated micro powder obtained in the step (1) with coal tar pitch according to a certain proportion and uniformly stirring to obtain a pasty first mixture;
(3) placing the first mixture obtained in the step (2) in a vacuum drier for vacuum drying for a period of time to obtain a dried second mixture, and cooling the second mixture in the drier for later use;
(4) grinding the cooled second mixture obtained in the step (3) in a grinding machine, and removing oversize products after screening, wherein the undersize products are second prefabricated micro powder with proper particle size, and the oversize products continue to return to the grinding machine for grinding;
(5) placing the second prefabricated micro powder in the step (4) into a high-pressure roasting furnace, firstly evacuating air in the high-pressure roasting furnace, then introducing nitrogen into the high-pressure roasting furnace, adjusting the pressure of the nitrogen to 2.5-3MPa, heating to 380-420 ℃ at the heating rate of 18-20 ℃/min, preserving heat for 3-3.5h, and naturally cooling to obtain a roasted product;
(6) grinding the roasted product obtained in the step (5) in a grinding machine, and removing oversize products after screening, wherein the undersize products are third prefabricated micro powder with proper particle size, and the oversize products continuously return to the grinding machine for grinding;
(7) putting the third prefabricated micro powder in the step (6) into a graphitization furnace, firstly evacuating the air in the graphitization furnace, then rapidly heating up to 7-8m when the temperature is raised to 1900-2100 DEG C3Continuously introducing chlorine at a flow rate of 1-1.5m when the temperature is raised to 2800-3000 ℃, keeping the temperature at 1900-3Continuously introducing chlorine gas at a flow rate of/h, preserving the heat for 1-1.5h at 2800-.
2. The method for producing fine structured high purity graphite with altered molecular arrangement combination according to claim 1, wherein in the step (1), the first pre-pulverized powder has a particle size of 6 to 10 μm.
3. The method for producing fine-structured high-purity graphite with altered molecular arrangement combination according to claim 1, wherein in the step (2), the mass ratio of the coal pitch to the first premade powder is 0.2-0.3: 1.
4. the method for producing a fine-structured high-purity graphite with altered molecular arrangement and combination as claimed in claim 1, wherein in the step (3), the vacuum degree of the vacuum drier is adjusted to 0.07-0.1MPa, the heating temperature of the vacuum drier is 250-300 ℃, and the drying time is 8-10 h.
5. The method for producing fine structured high purity graphite with altered molecular arrangement combination according to claim 1, wherein in the step (4), the second preform powder has a particle size of 6 to 10 μm.
6. The method for producing fine structured high purity graphite with altered molecular arrangement combination according to claim 1, wherein in the step (6), the third preform has a particle size of 6 to 10 μm.
7. The method for producing fine-structured high-purity graphite with altered molecular arrangement combination according to claim 1, wherein in the step (7), the purity of the final graphite is as high as 99.999%.
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| CN111180726A (en) * | 2020-02-17 | 2020-05-19 | 中钢集团鞍山热能研究院有限公司 | Production process and device for co-producing isotropic coke by using negative electrode material |
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