CN115849334A - Method for preparing sodium electric negative electrode material by continuously carbonizing bagasse - Google Patents
Method for preparing sodium electric negative electrode material by continuously carbonizing bagasse Download PDFInfo
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- CN115849334A CN115849334A CN202211495039.6A CN202211495039A CN115849334A CN 115849334 A CN115849334 A CN 115849334A CN 202211495039 A CN202211495039 A CN 202211495039A CN 115849334 A CN115849334 A CN 115849334A
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- 241000609240 Ambelania acida Species 0.000 title claims abstract description 48
- 239000010905 bagasse Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 43
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 15
- 239000007773 negative electrode material Substances 0.000 title claims abstract description 15
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 15
- 239000011734 sodium Substances 0.000 title claims abstract description 15
- 238000010000 carbonizing Methods 0.000 title claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 26
- 229910021385 hard carbon Inorganic materials 0.000 claims abstract description 22
- 238000000746 purification Methods 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000003763 carbonization Methods 0.000 claims abstract description 15
- 238000005336 cracking Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000010406 cathode material Substances 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 5
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 5
- 244000060011 Cocos nucifera Species 0.000 claims description 5
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 5
- 239000011425 bamboo Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 240000008042 Zea mays Species 0.000 claims description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 2
- 235000005822 corn Nutrition 0.000 claims description 2
- 239000011812 mixed powder Substances 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 239000003575 carbonaceous material Substances 0.000 abstract description 12
- 239000002028 Biomass Substances 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000003610 charcoal Substances 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000010405 anode material Substances 0.000 abstract 1
- 238000000197 pyrolysis Methods 0.000 description 9
- 229910003460 diamond Inorganic materials 0.000 description 6
- 239000010432 diamond Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 241001330002 Bambuseae Species 0.000 description 4
- 238000005087 graphitization Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 125000003184 C60 fullerene group Chemical group 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 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
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a method for preparing a sodium-electricity negative electrode material by continuously carbonizing bagasse, and belongs to the field of biomass material charcoal preparation and new energy. The method comprises the following steps: 1. crushing raw material bagasse or bagasse-containing material powder to obtain powder with length of 10-100 mm and diameter of 1-2 mm; 2. pressing the prepared powder raw material into a continuous carbonization furnace, dehydrating the bagasse raw material at 100-200 ℃, continuously heating to 400-1000 ℃, and then cracking to obtain cracked carbon; 3. heating the cracking carbon to 1350-1800 ℃ in a continuous graphitizing furnace for purification treatment to obtain the hard carbon powder as the cathode material for sodium power. The invention has the following advantages: provides a new channel for processing bagasse and the source of the sodium-electric anode material; the technological scheme is that bagasse is cracked continuously at high temperature to produce carbon material, and the cracked carbide is purified in a continuous high temperature atmosphere furnace to make the material suitable for producing sodium cathode material.
Description
Technical Field
The invention belongs to the field of biomass material charcoal making and new energy, and particularly relates to a method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse.
Background
Carbon exists in nature in a variety of allotropes-diamond, graphite, graphene, carbon nanotubes, C60, hexagonal type meteorite diamond (seradilite). Diamond and graphite have long been known, and Lawa tin was tested for burning diamond and graphite, and it was determined that both substances burned to produce CO 2 It follows that diamond and graphite contain the same "base", called carbon. It is Laval tin that first lists carbon in the periodic table. C60 was discovered in 1985 by harringoulo lauter et al, a chemist of the university of reston rice, usa, and is a spherical, stable carbon molecule consisting of 60 carbon atoms, the third allotrope of carbon behind diamond and graphite. The bagasse contains 0.61% of ash, 53.06% of cellulose, and the main component in the ash is potassium hydroxide. Carbon accounts for about 30% of the element proportion.
In the common knowledge in the field of organic chemistry, the bond energy of a C-C bond is about 345.6KJ/mol, the bond energy of a C-H bond is about 415.3KJ/mol, the bond energy of a C = C double bond is about 615KJ/mol, and the triple bond energy is 836.8KJ/mol. The shorter the bond length, the larger the bond energy. The double bond energy is larger than the single bond energy. Bond lengths can be compared approximately by atomic radius, and so on. Since carbon has a larger atomic radius than oxygen. So the bond energy: oxygen-oxygen double bond > carbon-oxygen single bond. Based on the principle of low energy balance based on physics and the basic bond energy parameters, under proper external conditions, the bagasse can be finally made into a pure carbon material by an artificial method.
Disclosure of Invention
Bagasse is a carbon making material containing a large amount of cellulose, and the key technical problem to be solved by the patent technology is that the making process must be carefully calculated to have commercial value. Because the carbon content of the raw materials is relatively lower than that of other biomasses (bamboo, coconut shell and the like), the method has popularization value only by adopting a continuous carbonization mode to manufacture the carbon material. The technical scheme of the invention is to adopt bagasse containing a large amount of cellulose to finish the preparation of the pure carbon material. The specific scheme is that bagasse is used for preparing a carbon material through continuous high-temperature pyrolysis, and a continuous high-temperature atmosphere furnace is used for purifying the carbide prepared through pyrolysis, so that the carbon material is suitable for preparing the sodium-electricity negative electrode material in the aspects of quality and economy.
The invention aims to disclose a method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse.
The purpose of the invention is realized by the following technical scheme:
a method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse comprises the following steps:
(1) Crushing raw material bagasse or bagasse-containing material powder to obtain powder with length of 10-100 mm and diameter of 1-2 mm; the bagasse-containing material powder is mixed powder of other crop stalks and bagasse, and the weight ratio of the other crop stalks to the bagasse is (3-7): (7-3);
(2) Pressing the prepared powder raw material into a continuous carbonization furnace, dehydrating the bagasse raw material at 100-200 ℃, continuously heating to 400-1000 ℃, and then cracking to obtain cracked carbon;
(3) Heating the cracking carbon to 1350-1800 ℃ in a continuous graphitizing furnace for purification treatment to obtain the hard carbon powder as the cathode material for sodium power.
The method according to the above technical solution, wherein: the other crop stalks are bamboo, coconut shells or corn stalks.
The method according to the above technical solution, wherein: the length of the crushed bagasse in the step (1) is 5-10 mm.
The method according to the above technical solution, wherein: when the purification treatment temperature in the step (3) is 1380 ℃, the purity of the hard carbon powder reaches 99 percent.
The method according to the above technical solution, wherein: when the purification treatment temperature in the step (3) is 1480 ℃, the purity of the hard carbon powder reaches 99.3%.
The method according to the above technical solution, wherein: the cracking temperature of the step (2) is 800-1000 ℃, and the purification treatment temperature in the step (3) is 1400-1800 ℃, so that the purity of the hard carbon powder reaches 99.5%.
The method according to the above technical solution, wherein: the particle size of the hard carbon powder is 10-80 mm.
The method described in the technical scheme of crushing bagasse in the step (1) with the length of 5-10 mm, wherein: when the purification treatment temperature in the step (3) is 1480 ℃, the purity of the hard carbon powder reaches 99.3 percent.
The method according to the above technical solution, wherein: the cracking temperature of the step (2) is 800-1000 ℃, and the purification treatment temperature in the step (3) is 1400-1800 ℃, so that the purity of the hard carbon powder reaches 99.5%.
The method of the above technical solution, wherein: the particle size of the hard carbon powder is 10-80 mm.
The invention solves the technical problem that organic chemistry, organic polymer, material purification, continuous carbonization technology and the like are combined on a specific set of device to finish the manufacture of the pure carbon material. Firstly, carbonizing bagasse by a compound continuous high-temperature decomposition furnace, a cyclone separation device and a rectification system; purifying the pyrolysis carbon by using a continuous high-temperature atmosphere furnace; the technical route is a brand new process technology equipment configuration and process design for preparing the high-purity carbon material from the bagasse, and related equipment configuration and process design do not exist in the original machinery industry, carbon industry, powder metallurgy, high-temperature technology field and the like.
The invention has the following beneficial effects:
1. the invention adopts bagasse with relatively low carbon content compared with other biomass (bamboo, coconut shell and the like) as a raw material to finish the preparation of pure carbon materials, changes waste into valuable and provides a new channel for processing the bagasse and the source of sodium-electricity cathode materials.
2. The technical scheme of the invention is that bagasse is adopted to be continuously pyrolyzed at high temperature to prepare a carbon material, and the pyrolyzed carbide is purified by a continuous high-temperature atmosphere furnace, so that the carbon material is suitable for preparing the sodium-electricity negative electrode material in the aspects of quality and economy.
3. The effective application and combination of the continuous carbonization and continuous purification technologies greatly reduce the energy consumption and working hours of unit products, and the manufacturing cost of similar products is reduced to 60 percent.
Description of the drawings:
1. FIG. 1 is a schematic view of a continuous carbonization section.
2. FIG. 2 is a schematic diagram of a purification treatment section.
The specific implementation mode is as follows:
in order to facilitate the understanding of the technical scheme of the invention, the method for preparing the sodium-electricity negative electrode material by continuously carbonizing bagasse is further described below by combining specific test examples.
Example 1:a method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse comprises the following steps:
(1) Crushing bagasse as a raw material into powder with the length of 5-10 mm and the diameter of 1-2 mm; the parameter setting has the advantages that the relative concentration of the carbon powder granularity of the semi-finished product of the material in the pyrolysis process section can be ensured, and the cracking process parameters are more controllable along with the continuous process;
(2) Pressing the prepared powder raw material into a continuous carbonization furnace, dehydrating the bagasse raw material at 100-200 ℃, continuously heating to 400-800 ℃, and then cracking; the cracking heat preservation time is related to the selection of raw material powder, and the heat preservation time is short corresponding to the small raw material particles;
(3) Heating the cracking carbon to 1350 for purification treatment in a continuous graphitization furnace to obtain hard carbon powder serving as a negative electrode material for sodium power; the final purity of the material is determined by the process, and when the purification process temperature is 1380 ℃, the purity reaches 99%.
The schematic view of the continuous carbonization furnace section in step (2) of this example is shown in FIG. 1, and the process flow shown in FIG. 1 is: the bagasse is continuously pushed into a carbonization furnace for high-temperature carbonization (400-600 ℃), the carbonized biomass carbon automatically enters a cyclone separation tower along with pyrolysis gas, the pyrolysis carbon is settled in a pyrolysis carbon collector, and the combustible gas is used for heating the continuous carbonization furnace after the pyrolysis gas is rectified in five stages. Because the raw materials have relatively low carbon content compared with other biomasses (bamboo, coconut shell and the like), the bagasse carbonization process must be carefully calculated, and the carbon material prepared by adopting the continuous carbonization mode has commercial popularization value.
In this example, the schematic diagram of the purification treatment section in step (3) is shown in FIG. 2, and impurities in bagasse pyrolysis will decompose and volatilize (mainly K, na, ca and Al) with the increase of temperature. The residual H and O elements in the carbon are discharged along with the further carbonization and decomposition of the material in the high-temperature process, the volume of the material is shrunk, the purity reaches about 99 percent, and the material is completely suitable for manufacturing sodium-electricity cathodes. In FIG. 2, different temperature ranges of 3000 degrees, 2200 degrees, etc. are applicable upper limits of the equipment, and the temperature control range of 1300-1800 ℃ is used for purifying the hard carbon powder.
The product hard carbon powder of example 1 is subjected to conventional tests such as standard sieve for granularity, muffle furnace for water content and balance, etc., and the hard carbon powder performance indexes (reference values) are as follows:
a type: granularity of 100 meshes, water content of 5-6%, fixed carbon content of 90%, ash content of 2-3%, volatile component of 3-4%, and specific surface area of 500-600m 2 G, pH 8, bulk density 0.70-0.80 g/cm 3 The graphitization temperature is higher than 2880 ℃.
B type: granularity of-200 meshes, water content of 1-2%, fixed carbon content of 97%, ash content of 1%, volatile component of 2%, and specific surface area of 600-700m 2 The pH value is 6-7, and the bulk density is 1.0-1.1 g/cm 3 . The graphitization temperature is higher than 2880 ℃.
Example 2:a method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse comprises the following steps:
this example is the same as example 1, except that: in the step (1), the raw material bagasse is crushed and made into powder with the length of 10-100 mm and the diameter of 1-2 mm.
Example 3:a method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse comprises the following steps:
this example is the same as example 1, except that: when the purification treatment temperature of the continuous graphitization furnace in the step (3) is 1480 ℃, the purity reaches 99.3%.
Example 4:a method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse comprises the following steps:
this example is the same as example 1, except that: when the cracking temperature in the step (2) is 800-1000 ℃ and the purification treatment temperature of the continuous graphitizing furnace in the step (3) is 1400-1800 ℃, the purity of the hard carbon reaches 99.5 percent.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims; meanwhile, any equivalent changes, modifications and evolutions of the above embodiments according to the essential technology of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. A method for preparing a sodium electric negative electrode material by continuously carbonizing bagasse is characterized by comprising the following steps:
(1) Crushing raw material bagasse or bagasse-containing material powder to obtain powder with length of 10-100 mm and diameter of 1-2 mm; the bagasse-containing material powder is mixed powder of other crop stalks and bagasse, and the weight ratio of the other crop stalks to the bagasse is (3-7): (7-3);
(2) Pressing the prepared powder raw material into a continuous carbonization furnace, dehydrating the bagasse raw material at 100-200 ℃, continuously heating to 400-1000 ℃, and then cracking to obtain cracked carbon;
(3) Heating the cracking carbon to 1350-1800 ℃ in a continuous graphitizing furnace for purification treatment to obtain the hard carbon powder as the cathode material for sodium power.
2. The method of claim 1, wherein: the other crop stalks are bamboo, coconut shells or corn stalks.
3. The method according to claim 1 or 2, characterized in that: the length of the crushed bagasse in the step (1) is 5-10 mm.
4. The method according to claim 1 or 2, characterized in that: when the purification treatment temperature in the step (3) is 1380 ℃, the purity of the hard carbon powder reaches 99%.
5. The method according to claim 1 or 2, characterized in that: when the purification treatment temperature in the step (3) is 1480 ℃, the purity of the hard carbon powder reaches 99.3%.
6. The method according to claim 1 or 2, characterized in that: the cracking temperature of the step (2) is 800-1000 ℃, and the purification treatment temperature in the step (3) is 1400-1800 ℃, so that the purity of the hard carbon powder reaches 99.5%.
7. The method according to claim 1 or 2, characterized in that: the particle size of the hard carbon powder is 10-80 mm.
8. The method of claim 3, wherein: when the purification treatment temperature in the step (3) is 1480 ℃, the purity of the hard carbon powder reaches 99.3%.
9. The method of claim 3, wherein: the cracking temperature of the step (2) is 800-1000 ℃, and the purification treatment temperature in the step (3) is 1400-1800 ℃, so that the purity of the hard carbon powder reaches 99.5%.
10. The method of claim 3, wherein: the particle size of the hard carbon powder is 10-80 mm.
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| CN202211495039.6A CN115849334A (en) | 2022-11-26 | 2022-11-26 | Method for preparing sodium electric negative electrode material by continuously carbonizing bagasse |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279268A (en) * | 1999-07-02 | 2001-01-10 | 沈智杰 | Process for preparing charcoal from cane dregs |
| CN103950916A (en) * | 2014-04-24 | 2014-07-30 | 合肥国轩高科动力能源股份公司 | Preparation method of carbonaceous anode material for lithium ion batteries |
| CN108059144A (en) * | 2017-12-11 | 2018-05-22 | 桂林电子科技大学 | Hard carbon prepared by a kind of biomass waste material bagasse and its preparation method and application |
| CN110510597A (en) * | 2019-09-18 | 2019-11-29 | 张家港宝诚电子有限公司 | A method of high-purity carbon is prepared using sucrose |
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- 2022-11-26 CN CN202211495039.6A patent/CN115849334A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279268A (en) * | 1999-07-02 | 2001-01-10 | 沈智杰 | Process for preparing charcoal from cane dregs |
| CN103950916A (en) * | 2014-04-24 | 2014-07-30 | 合肥国轩高科动力能源股份公司 | Preparation method of carbonaceous anode material for lithium ion batteries |
| CN108059144A (en) * | 2017-12-11 | 2018-05-22 | 桂林电子科技大学 | Hard carbon prepared by a kind of biomass waste material bagasse and its preparation method and application |
| CN110510597A (en) * | 2019-09-18 | 2019-11-29 | 张家港宝诚电子有限公司 | A method of high-purity carbon is prepared using sucrose |
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