A cylindrical electrode paste and a method for preparing the same

Abstract

The present application relates to a kind of cylindrical electrode paste and its preparation method.A kind of cylindrical electrode paste, by mass parts, including 15-20 parts of anthracite main material, 25-40 parts of residual anode, 3-10 parts of graphite fragment, 25-35 parts of coke, 15-30 parts of organic binder, 6-18 parts of bio-based binder. Among them, organic binder includes medium temperature pitch, anthracene oil, beta resin. Among them, bio-based binder includes carbonized hydrophobic composite modified wood bamboo powder, sodium carboxymethyl cellulose. The carbonized hydrophobic composite modified wood bamboo powder of the present application and sodium carboxymethyl cellulose are compounded to form a bio-based binder, which cooperates with the organic binder to ensure the bonding strength, high temperature resistance and electrical conductivity of the cylindrical electrode paste, while realizing the green and low-carbon utilization of biomass, solving the problems of high temperature failure, moisture absorption and easy caking, and many pores of traditional bio-based binder, reducing the resistivity and production cost, and improving the structural density and use stability.

Description

Technical Field

[0001] This invention belongs to the field of electrode paste preparation technology, specifically relating to a cylindrical electrode paste and its preparation method. Background Technology

[0002] Electrode paste, as the core raw material of self-baking electrodes, is an amorphous carbon product made by mixing various carbonaceous aggregates and binders in a specific ratio. It is widely used in high-temperature metallurgical equipment such as electrolytic aluminum, ferroalloys, and calcium carbide furnaces, playing a key role in conducting current and maintaining high-temperature chemical reactions. Its performance directly determines the efficiency, safety, and stability of metallurgical production, and plays an important supporting role in energy conservation, emission reduction, and green development of downstream industries.

[0003] Currently, in commonly used industrial electrode paste formulations, carbonaceous aggregates mainly include anthracite, residual anode, coke, and graphite fragments, while binders are primarily traditional asphalt-based organic binders. Although these binders can ensure the basic bonding performance of the electrode paste, they have many inherent defects: On the one hand, traditional asphalt-based binders release a large amount of toxic volatiles during production and use, which does not meet the current requirements for green, low-carbon, and safe industrial production, and cannot achieve high-value utilization of renewable resources; on the other hand, traditional biological binders (such as plant asphalt, syrup, and starch) used to improve environmental friendliness have inherently insufficient thermal stability and cannot be adapted to the high-temperature use scenarios of electrode paste above 1000℃ in metallurgical processes, easily leading to high-temperature failure, seriously affecting the service life and safety of the electrode paste. At the same time, these traditional biological binders are highly hygroscopic, easily causing the electrode paste to clump during storage and develop pore defects due to moisture evaporation after molding, reducing storage stability and molding qualification rate, making it difficult to meet the needs of large-scale industrial production.

[0004] In the prior art, patent CN119570443B discloses a bio-based binder and electrode paste, and its preparation method. It includes alcohol, plant asphalt, syrup, and starch with a purity of 55%~65%, and the mass ratio of alcohol, plant asphalt, syrup, and starch is (20~25):(150~170):(70~85):(90~110). This technical solution directly uses unmodified biomass such as plant asphalt, syrup, and starch. It suffers from poor high-temperature thermal stability (easily decomposes and fails above 1000℃), high hygroscopicity (resulting in clumping during storage and numerous air pockets during molding), and lack of conductivity (the insulating phase hinders current transmission). Although attempts have been made to improve fluidity through the compounding of alcohol, plant asphalt, syrup, and starch, the core modification problem of biomass materials has not been solved. Its formulation is essentially still a physical mixture, unable to overcome the structural instability of biomass materials at high temperatures, and unable to adapt to the harsh metallurgical environments such as electrolytic aluminum and ferroalloys. Summary of the Invention

[0005] This invention provides a cylindrical electrode paste and its preparation method to solve the technical problems of traditional biological binders, such as high-temperature failure, strong hygroscopicity, non-dense internal structure, uneven conductivity, poor environmental performance, and failure to achieve high-value utilization of biomass.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A cylindrical electrode paste, by weight, comprises 15-20 parts of anthracite as the main material, 25-40 parts of residual anode, 3-10 parts of graphite fragments, 25-35 parts of coke, 15-30 parts of organic binder, and 6-18 parts of bio-based binder.

[0007] The organic binder includes medium-temperature asphalt, anthracene oil, and β-resin.

[0008] The bio-based binder includes carbonized hydrophobic composite modified wood and bamboo powder and sodium carboxymethyl cellulose, wherein the carbonized hydrophobic composite... The mass ratio of modified wood and bamboo powder to sodium carboxymethyl cellulose is (90-80): (10-20).

[0009] Furthermore, the modification method of carbonized hydrophobic composite modified wood and bamboo powder includes the following steps: First, the wood and bamboo powder is carbonized at a temperature of 400℃-600℃. Then, a polysiloxane coating is deposited on the surface of the carbonized wood and bamboo powder by vapor deposition to form a dense hydrophobic protective film.

[0010] Furthermore, during the modification process of carbonized hydrophobic composite modified wood and bamboo powder, the temperature of vapor deposition is 80-120℃ and the time is 1-3h.

[0011] Furthermore, the anthracite main material is one or a mixture of calcined anthracite, electrically calcined coal, or both.

[0012] The calcined anthracite coal has the following characteristics: ash content 5-6.5 wt%, volatile matter 0.5-1 wt%, and true density 1.7-1.8 g / cm³. 3 resistivity 1100-1200 μΩ·m, calcination temperature 1200-1230℃.

[0013] Calcined coal for electric heating: ash content 5-6.5 wt%, volatile matter 0.5-1 wt%, true density 1.8-1.9 g / cm³ 3 Resistivity 550-650 μΩ·m Calcination temperature: 1700-1800℃.

[0014] Furthermore, both the calcined anthracite and the electrically calcined coal comprise 20-40% small particles with a diameter of 5-10 mm and 60-80% large particles with a diameter of 10-20 mm.

[0015] Furthermore, the residual anode comprises 10-20% small particles with a diameter of 10-20 mm, 10-20% medium particles with a diameter of 20-40 mm, and 65-75% large particles with a diameter of 40-60 mm.

[0016] Furthermore, the content of β resin in the organic binder is 0.1-10%, and the content of anthracene oil is 0.1-23%.

[0017] Furthermore, the coke includes 3-10% modified coke or carbon microspheres or a mixture of modified coke and carbon microspheres.

[0018] The above-mentioned method for preparing cylindrical electrode paste includes the following steps: S1. Mixing and kneading treatment: A certain weight of anthracite main material, residual anode, graphite fragments, and coke are put into a kneading pot for dry mixing treatment. After a period of time, organic binder and bio-based binder are added for wet mixing treatment. The temperature of the kneading pot is 170-220℃.

[0019] S2. Molding process: The mixed material is placed into a cylindrical mold, and the mold containing the material is placed on a vibration platform to achieve the molding process. The vibration amplitude is 4-12mm, the vibration frequency is 960rpm, and the vibration time is 30-60s.

[0020] Furthermore, in the S1 kneading treatment, when the room temperature is 15-30℃, the dry mixing treatment time is 25 min and the wet mixing treatment time is 45 min; when the room temperature is 0-14℃, the dry mixing treatment time is 30 min and the wet mixing treatment time is 40 min.

[0021] The beneficial effects of this invention are as follows: Natural wood and bamboo waste is used as raw material, carbonized at 400-600℃ to form a graphite-like carbon skeleton, and then a polysiloxane hydrophobic layer is formed through vapor deposition. This fundamentally reduces hygroscopicity, improves high-temperature stability and conductivity, replaces some traditional asphalt binders, reduces toxic volatiles, and is lower in carbon footprint and safer. Overall, by compounding carbonized hydrophobic composite modified wood and bamboo powder with sodium carboxymethyl cellulose as a bio-based binder, and working synergistically with organic binders such as medium-temperature asphalt, anthracene oil, and β-resin, the high-value utilization of green and renewable biomass resources is achieved while ensuring the bonding strength, high-temperature resistance, and conductivity of the electrode paste, making it more environmentally friendly and safer. By performing multi-stage particle gradation on anthracite, residual anode, coke, and graphite fragments, and introducing modified coke or carbon microspheres into the coke, the internal structure of the electrode paste becomes denser, effectively reducing resistivity, reducing porosity defects, and improving overall strength and stability in use.

[0022] Among them, modified wood and bamboo powder and carbonized hydrophobic composite modified wood and bamboo powder are suitable for high-temperature applications of electrode paste, solving the problem of high-temperature failure of traditional biological binders. Electrode paste needs to withstand high-temperature environments above 1000℃ for extended periods during metallurgical processes such as aluminum electrolysis and ferroalloy production. The thermal stability of the binder directly determines the service life and safety of the electrode paste. Traditional plant asphalt, syrup, and starch-based biological binders inherently lack thermal stability. However, the carbonized and hydrophobic composite modified wood and bamboo powder has its internal cellulose and hemicellulose fully decomposed, forming a stable graphitized carbon skeleton with dense micropores and a stable structure. It can withstand metallurgical high temperatures above 1000℃ for extended periods, exhibits low pyrolysis weight loss, and can continuously maintain its adhesive strength and structural integrity.

[0023] Meanwhile, the graphitized structure formed by the carbonization of modified wood and bamboo powder possesses excellent conductivity, directly providing charge transport channels for the electrode paste. Furthermore, its retained multi-scale porous network effectively aids in the uniform dispersion of conductive fillers, further reducing electrode paste resistance and optimizing the integrity of the conductive network. Compared to traditional binders, modified wood and bamboo powder reduces the amount of conductive filler required, lowering production costs while improving the conductivity stability of the electrode paste. This avoids problems such as localized overheating and rapid electrode wear caused by uneven conductivity, adapting to the diverse conductivity requirements of electrode pastes in different metallurgical applications.

[0024] Furthermore, after secondary hydrophobic modification, the modified wood and bamboo powder forms a dense hydrophobic coating on its surface, effectively blocking the contact between moisture and the micropores inside the wood and bamboo. Simultaneously, the carbonization process significantly reduces the number of micropores, fundamentally reducing hygroscopicity. This ensures that the modified wood and bamboo powder and electrode paste do not clump during long-term storage, and that there are no porosity defects caused by moisture evaporation after molding. This improves the storage stability and molding yield of the electrode paste, reduces waste generation during production, lowers storage and production losses, and meets the storage and molding requirements of large-scale industrial production. After carbonization and cross-linking, the lignin in the modified wood and bamboo powder has active groups such as hydroxyl and carboxyl groups in its molecular structure that can form strong chemical bonds with the surface of carbon aggregate, with a bonding strength far exceeding that of hydrogen bonds. At the same time, its dense porous structure acts as a "buffer layer" at the bonding interface, mitigating damage caused by high-temperature thermal expansion stress and mechanical vibration, and improving bonding stability. Detailed Implementation

[0025] The present invention will be further described below with reference to embodiments thereof. Example 1

[0026] The cylindrical electrode paste provided in this embodiment comprises, by weight, 18 parts anthracite main material, 32 parts residual anode, 6 parts graphite fragments, 30 parts coke, 22 parts organic binder, and 12 parts bio-based binder.

[0027] The organic binder includes medium-temperature asphalt, anthracene oil, and β-resin.

[0028] The bio-based binder includes carbonized hydrophobic composite modified wood and bamboo powder and sodium carboxymethyl cellulose, wherein the carbonized hydrophobic composite... The mass ratio of modified wood and bamboo powder to sodium carboxymethyl cellulose is 85:15.

[0029] Specifically, the preparation method of carbonized hydrophobic composite modified wood and bamboo powder is as follows: First, the wood and bamboo powder is carbonized at a temperature of 450℃. Then, a polysiloxane coating is deposited on the surface of the carbonized wood and bamboo powder by vapor deposition to form a dense hydrophobic protective film. The vapor deposition temperature is 90℃ and the time is 1.5h.

[0030] In this embodiment, calcined anthracite and electrically calcined coal are mixed in a 1:1 ratio.

[0031] Calcined anthracite: ash content 5.8 wt%, volatile matter 0.8 wt%, true density 1.75 g / cm3, resistivity 1150 μΩ·m, calcination temperature 1200℃.

[0032] Electric calcined coal: ash content 5.8 wt%, volatile matter 0.8 wt%, true density 1.85 g / cm3, resistivity 600 μΩ·m, calcination temperature 1750℃.

[0033] Both calcined anthracite and electrically calcined coal contain 30% small particles with a diameter of 5-10 mm and 70% large particles with a diameter of 10-20 mm.

[0034] The residual anode comprises 15% small particles with a diameter of 10-20 mm, 15% medium particles with a diameter of 20-40 mm, and 70% large particles with a diameter of 40-60 mm.

[0035] The organic binder contains 5% β-resin, 12% anthracene oil, and the remainder is medium-temperature asphalt.

[0036] The coke contains 6% of a mixture of modified coke and carbon microspheres, with the ratio of modified coke to carbon microspheres being 1:1.

[0037] The preparation method of this cylindrical electrode paste is as follows: S1. Mixing treatment: At room temperature of 22℃, the above-mentioned weight parts of anthracite main material, residual anode, graphite fragments and coke are put into a mixing pot for dry mixing treatment for 25 minutes. Then, organic binder and bio-based binder are added for wet mixing treatment for 45 minutes. The temperature of the mixing pot is controlled at 200℃.

[0038] S2. Molding process: The mixed material is placed into a cylindrical mold, and the mold containing the material is placed on a vibration platform to achieve the molding process. The vibration amplitude is 6mm, the vibration frequency is 960rpm, and the vibration time is 50s. Example 2

[0039] This embodiment provides a cylindrical electrode paste, which, by weight, comprises 15 parts anthracite as the main material, 25 parts residual anode, 3 parts graphite fragments, 25 parts coke, 25 parts organic binder, and 6 parts bio-based binder.

[0040] The organic binder includes medium-temperature asphalt, anthracene oil, and β-resin.

[0041] The bio-based binder includes carbonized hydrophobic composite modified wood and bamboo powder and sodium carboxymethyl cellulose, wherein the carbonized hydrophobic composite... The mass ratio of modified wood and bamboo powder to sodium carboxymethyl cellulose is 90:10.

[0042] Specifically, the preparation method of carbonized hydrophobic composite modified wood and bamboo powder is as follows: First, the wood and bamboo powder is carbonized at a temperature of 500℃. Then, a polysiloxane coating is deposited on the surface of the carbonized wood and bamboo powder by vapor deposition to form a dense hydrophobic protective film. The vapor deposition temperature is 100℃ and the time is 2 hours.

[0043] In this embodiment, calcined anthracite and electrically calcined coal are mixed in a 1:1 ratio.

[0044] Calcined anthracite: ash content 5.8 wt%, volatile matter 0.8 wt%, true density 1.75 g / cm3, resistivity 1150 μΩ·m, calcination temperature 1200℃.

[0045] Electric calcined coal: ash content 5.8 wt%, volatile matter 0.8 wt%, true density 1.85 g / cm3, resistivity 600 μΩ·m, calcination temperature 1750℃.

[0046] Both calcined anthracite and electrically calcined coal contain 30% small particles with a diameter of 5-10 mm and 70% large particles with a diameter of 10-20 mm.

[0047] The residual anode comprises 15% small particles with a diameter of 10-20 mm, 15% medium particles with a diameter of 20-40 mm, and 70% large particles with a diameter of 40-60 mm.

[0048] The organic binder contains 5% β-resin, 12% anthracene oil, and the remainder is medium-temperature asphalt.

[0049] The coke contains 6% of a mixture of modified coke and carbon microspheres, with the ratio of modified coke to carbon microspheres being 1:1.

[0050] The preparation method of this cylindrical electrode paste is as follows: S1. Mixing treatment: At room temperature of 25℃, the above-mentioned weight parts of anthracite main material, residual anode, graphite fragments and coke are put into a mixing pot for dry mixing treatment for 25 minutes. Then, organic binder and bio-based binder are added for wet mixing treatment for 45 minutes. The temperature of the mixing pot is controlled at 190℃.

[0051] S2. Molding process: The mixed material is placed into a cylindrical mold, and the mold containing the material is placed on a vibration platform to achieve the molding process. The vibration amplitude is 8mm, the vibration frequency is 960rpm, and the vibration time is 45s. Example 3

[0052] This embodiment provides a cylindrical electrode paste, which, by weight, comprises 20 parts anthracite as the main material, 40 parts residual anode, 10 parts graphite fragments, 35 parts coke, 15 parts organic binder, and 18 parts bio-based binder.

[0053] The organic binder includes medium-temperature asphalt, anthracene oil, and β-resin.

[0054] The bio-based binder includes carbonized hydrophobic composite modified wood and bamboo powder and sodium carboxymethyl cellulose, wherein the carbonized hydrophobic composite... The mass ratio of modified wood and bamboo powder to sodium carboxymethyl cellulose is 80:20.

[0055] Specifically, the preparation method of carbonized hydrophobic composite modified wood and bamboo powder is as follows: First, the wood and bamboo powder is carbonized at a temperature of 550℃. Then, a polysiloxane coating is deposited on the surface of the carbonized wood and bamboo powder by vapor deposition to form a dense hydrophobic protective film. The vapor deposition temperature is 110℃ and the time is 2.5h.

[0056] In this embodiment, calcined anthracite and electrically calcined coal are mixed in a 1:1 ratio.

[0057] Calcined anthracite: ash content 5.8 wt%, volatile matter 0.8 wt%, true density 1.75 g / cm3, resistivity 1150 μΩ·m, calcination temperature 1200℃.

[0058] Electric calcined coal: ash content 5.8 wt%, volatile matter 0.8 wt%, true density 1.85 g / cm3, resistivity 600 μΩ·m, calcination temperature 1750℃.

[0059] Both calcined anthracite and electrically calcined coal contain 30% small particles with a diameter of 5-10 mm and 70% large particles with a diameter of 10-20 mm.

[0060] The residual anode comprises 15% small particles with a diameter of 10-20 mm, 15% medium particles with a diameter of 20-40 mm, and 70% large particles with a diameter of 40-60 mm.

[0061] The organic binder contains 5% β-resin, 12% anthracene oil, and the remainder is medium-temperature asphalt.

[0062] The coke contains 6% of a mixture of modified coke and carbon microspheres, with the ratio of modified coke to carbon microspheres being 1:1.

[0063] The preparation method of this cylindrical electrode paste is as follows: S1. Mixing treatment: At room temperature of 28℃, the above-mentioned weight parts of anthracite main material, residual anode, graphite fragments and coke are put into a mixing pot for dry mixing treatment for 25 minutes. Then, organic binder and bio-based binder are added for wet mixing treatment for 45 minutes. The temperature of the mixing pot is controlled at 210℃.

[0064] S2. Molding process: The mixed material is placed into a cylindrical mold, and the mold containing the material is placed on a vibration platform to achieve the molding process. The vibration amplitude is 10mm, the vibration frequency is 960rpm, and the vibration time is 40s.

[0065] Comparative Example 1 The difference between this comparative example and Example 1 is that no bio-based binder was added; all binders used were organic binders.

[0066] Comparative Example 2 The difference between this comparative example and Example 1 is that carbonized hydrophobic composite modified wood and bamboo powder is not used; instead, unmodified ordinary wood and bamboo powder is used, i.e., it is not carbonized and is not modified by vapor deposition hydrophobic modification.

[0067] Comparative Example 3 The difference between this comparative example and Example 1 is that the bio-based binder is replaced with a conventional bio-based additive. Specifically, a commonly used plant asphalt and starch compound system is selected, with a mass ratio of 7:3.

[0068] The cylindrical electrode pastes prepared in Example 1 and Comparative Examples 1-3 were tested, and the results are shown in Table 1.

[0069] detection indicators Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Volume resistivity / μΩ·m 720 890 850 870 Compressive strength / MPa 31.2 25.3 24.7 26.5 Thermal stability (weight loss rate) / % 2.8 4.5 8.9 5.2 Hygroscopicity / % 0.9 1.8 4.2 2.5 Molding porosity / % 1.9 3.5 5.8 3.8 Analysis of the above data shows that, compared with Comparative Example 1, the volume resistivity of the present invention is reduced by 12.4%-21.3%, the compressive strength is increased by 12.6%-29.6%, the thermal stability is significantly optimized (i.e., the weight loss rate is reduced by 28.9%-46.7%), the hygroscopicity is reduced by 38.9%-44.4%, and the molding porosity is reduced by 34.3%-45.7%. This demonstrates that the synergistic effect of bio-based adhesives and organic adhesives can improve electrical conductivity and thermal stability while ensuring bonding strength, reducing porosity defects, and being more environmentally friendly.

[0070] Compared to Comparative Example 2, which uses unmodified wood and bamboo powder, Comparative Example 2 exhibits extremely poor thermal stability, with a weight loss rate of 8.9%, which is 3.2 times that of Example 1. Its hygroscopicity is significantly increased, reaching 4.7 times that of Example 1, and its compressive strength is reduced by 20.8%. This indicates that the graphite-like carbon skeleton formed by carbonization can improve thermal stability and electrical conductivity, and the hydrophobic coating formed by vapor deposition can reduce hygroscopicity from the root cause, thus solving the problems of high-temperature failure and strong hygroscopicity of traditional biological adhesives.

[0071] Compared to Comparative Example 3, Comparative Example 3, which uses conventional bio-based additives such as plant asphalt and starch, exhibits poor thermal stability. Specifically, its weight loss rate is 5.2%, which is 1.9 times that of Example 1, its hygroscopicity is significantly increased, which is 2.8 times that of Example 1, its compressive strength decreases by 15.1%, and its volume resistivity increases by 20.8%. This demonstrates that the bio-based binder modified by carbonization and hydrophobic composite of the present invention can effectively improve thermal stability and reduce hygroscopicity compared to conventional bio-based additives, while also optimizing bonding strength and electrical conductivity. This addresses the industry pain points of traditional bio-based additives, such as easy failure at high temperatures and strong hygroscopicity.

[0072] In summary, this invention, through the compounding of carbonized hydrophobic composite modified wood and bamboo powder with organic binders, achieves balanced and superior performance indicators, including the lowest volume resistivity, high compressive strength, best thermal stability, and lowest hygroscopicity and molding porosity. It is suitable for the high-temperature and high-conductivity requirements of metallurgical scenarios such as electrolytic aluminum and ferroalloys, while realizing the high-value utilization of biomass resources, reducing the emission of toxic volatiles, and making it more low-carbon and safe.

Claims

1. A cylindrical electrode paste, characterized in that, By weight, it includes 15-20 parts anthracite main material, 25-40 parts residual anode, 3-10 parts graphite fragments, 25-35 parts coke, 15-30 parts organic binder, and 6-18 parts bio-based binder. The organic binder includes medium-temperature pitch, anthracene oil, and β-resin; The bio-based binder includes carbonized hydrophobic composite modified wood and bamboo powder and sodium carboxymethyl cellulose, wherein the mass ratio of carbonized hydrophobic composite modified wood and bamboo powder to sodium carboxymethyl cellulose is (90-80):(10-20).

2. The cylindrical electrode paste according to claim 1, characterized in that, The modification method of carbonized hydrophobic composite modified wood and bamboo powder includes the following steps: First, the wood and bamboo powder is carbonized at a temperature of 400℃-600℃. Then, a polysiloxane coating is deposited on the surface of the carbonized wood and bamboo powder by vapor deposition to form a dense hydrophobic protective film.

3. The cylindrical electrode paste according to claim 2, characterized in that, During the carbonization and hydrophobic composite modification of wood and bamboo powder, the vapor deposition temperature is 80-120℃ and the time is 1-3h.

4. The cylindrical electrode paste according to claim 1, characterized in that, The main raw material of anthracite is one or a mixture of calcined anthracite, electric calcined coal, or both. The calcined anthracite coal has the following characteristics: ash content 5-6.5 wt%, volatile matter 0.5-1 wt%, and true density 1.7-1.8 g / cm³. 3 Resistivity 1100-1200μΩ·m, calcination temperature 1200-1230℃; Calcined coal for electric heating: ash content 5-6.5 wt%, volatile matter 0.5-1 wt%, true density 1.8-1.9 g / cm³ 3 Resistivity 550-650 μΩ·m, calcination temperature 1700-1800℃.

5. The cylindrical electrode paste according to claim 4, characterized in that, Both the calcined anthracite and the electrically calcined coal contain 20-40% small particles with a diameter of 5-10 mm and 60-80% large particles with a diameter of 10-20 mm.

6. The cylindrical electrode paste according to claim 1, characterized in that, The residual anode comprises 10-20% small particles with a diameter of 10-20 mm, 10-20% medium particles with a diameter of 20-40 mm, and 65-75% large particles with a diameter of 40-60 mm.

7. The cylindrical electrode paste according to claim 1, characterized in that, The organic binder contains 0.1-10% β-resin and 0.1-23% anthracene oil.

8. The cylindrical electrode paste according to claim 1, characterized in that, The coke contains 3-10% modified coke or carbon microspheres or a mixture of modified coke and carbon microspheres.

9. A method for preparing a cylindrical electrode paste as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Mixing and kneading treatment: A certain weight of anthracite main material, residual anode, graphite fragments, and coke are put into a kneading pot for dry mixing treatment. After a period of time, organic binder and bio-based binder are added for wet mixing treatment. The temperature of the kneading pot is 170-220℃. S2. Molding process: The mixed material is placed into a cylindrical mold, and the mold containing the material is placed under a vibrating screen. The molding process is carried out on the platform, with the vibration amplitude being 4-12mm, the vibration frequency being 960rpm, and the vibration time being 30-60s.

10. The preparation process of the cylindrical electrode paste according to claim 9, characterized in that, In the S1 kneading process, when the room temperature is 15-30℃, the dry mixing time is 25 min and the wet mixing time is 45 min; when the room temperature is 0-14℃, the dry mixing time is 30 min and the wet mixing time is 40 min.