CN118621381A - High-quality prebaked anode and preparation method thereof - Google Patents
High-quality prebaked anode and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 46
- 238000005087 graphitization Methods 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000002008 calcined petroleum coke Substances 0.000 claims description 84
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 50
- 229910052799 carbon Inorganic materials 0.000 claims description 33
- 239000011300 coal pitch Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 38
- 229910052782 aluminium Inorganic materials 0.000 description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 31
- 238000005868 electrolysis reaction Methods 0.000 description 22
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000011329 calcined coke Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention provides a high-quality prebaked anode and a preparation method thereof, which utilize auxiliary materials in a negative graphitization furnace as powder materials in the particle composition of the prebaked anode and provide a preparation method capable of effectively reducing the resistivity of the prebaked anode, reducing the air reactivity of the prebaked anode and reducing the CO2 reactivity of the prebaked anode.
Description
Technical Field
The invention belongs to the technical field of aluminum electrolysis, and relates to a high-quality prebaked anode and a preparation method thereof.
Background
The yield of electrolytic aluminum in 2020 of China is 3712.4 ten thousand tons. The total electricity consumption of industries is about 5011.74 hundred million kWh according to the electricity consumption 13500kWh for producing one ton of electrolytic aluminum, which is about 6.67 percent of 75110 hundred million kWh in the whole society of China in 2020, and the carbon dioxide discharged by producing one ton of electrolytic aluminum in an electrolysis link is about 1.8 tons, and the prebaked anode capacity of China is 3000 tens of thousands tons at present, the total discharge amount of carbon dioxide in the electrolytic aluminum industry in 2020 is about 4.26 hundred million tons, which is about 5 percent of the total net discharge amount of carbon dioxide in the whole society,
Regarding the whole production state of the Chinese electrolytic aluminum, the comprehensive utilization efficiency of energy is about 15% lower than the international advanced level, and the method is mainly characterized in that: the current efficiency is 2-3%, the electricity consumption per ton of aluminum is 300-800Kwh, and the anode consumption of electrolytic aluminum is 30-60Kg (about 75-150Kg of standard coal). These problems are mainly in the quality of the carbon anode for aluminum in China.
The quality of the carbon anode, such as CO 2/air reactivity and resistivity of the prebaked anode, directly or indirectly affects various economic and technical indexes of lead electrolysis, such as current efficiency, electric energy consumption, anode carbon consumption and the like.
In the electrolysis process, the CO 2/air reactive carbon anode of the prebaked anode reacts with air and carbon dioxide at the same time of anode reaction, and is corroded by the air and the carbon dioxide. This not only increases the consumption of the anode, but also causes the anode slag drop phenomenon. Therefore, the reaction activity of air and carbon dioxide of the carbon anode is reduced, the current efficiency is improved, and the ton aluminum carbon consumption and electricity consumption carbon are reduced. The anode resistivity is a very direct standard for evaluating the anode quality, and directly influences economic and technical indexes such as ton aluminum power consumption, cell voltage drop and the like in aluminum electrolysis production.
The preparation process flow of the prebaked anode comprises the following five parts of raw material preparation and satin calcination, calcination material crushing and screening, material proportioning and kneading, green block forming and green block roasting, and the reasonable grain size distribution determines the density, the thermal expansion coefficient, the chemical reactivity and other key anode performances of the prebaked anode. The preparation method comprises the steps of mixing the forged coke granular aggregate with different grain sizes and petroleum coke powder according to a certain proportion, wherein the purpose of the preparation method is to obtain a carbon material with large bulk density and small porosity, and the grain size distribution of a carbon anode is generally prepared by adopting 3-4 grain-size calcined cokes: coarse particles, medium particles, small particles and powders. The large particles are piled up, the medium particles are filled, the small particles and the powder are further filled, and the binder coal pitch binds the components into a whole, wherein each component has the special function.
The powder in the grain composition is filled in gaps and pores among large grains, middle grains and small grains, and when the proportion of the powder is increased, the anode density is increased, the anode porosity is reduced, the mechanical strength is improved, and meanwhile, the external light of the anode is finer and smoother. However, if the powder is excessive, the internal stress of the anode is excessive, so that cracks appear in the anode green block during sintering, the pre-baked anode strength is reduced, the resistivity is increased, and the CO 2/air reaction is increased.
The powder in the existing prebaked anode grain composition generally only accounts for about 30 wt% of the total mass of the dry materials, the powder is calcined coke ball milled powder, dust removed and recovered micro powder, and the granularity is less than 75 mu m. These powders have a small particle size and a large specific surface area; meanwhile, the unsaturated particles on the surface of the powder particles are increased, the active sites are generally considered to be mainly positioned at the edge sites and the surfaces of the powder particles, the free energy of the surfaces is large, and the reaction activation energy of the system is reduced, namely the reaction activity is improved. The reaction dynamics mechanism of the prebaked anode carbon block, O2 and CO2 is a diffusion control process, on one hand, the specific surface area of powder is large, the surface free energy is large, the reactivity of the prebaked anode carbon block, O2 and CO2 is promoted, and the carbon consumption and CO2 emission of the prebaked anode are increased in the aluminum electrolysis process; on the other hand, the powder obtained by crushing calcined coke has the advantages that the degree of crystal non-customization is increased, the powder resistivity is increased, and economic and technical indexes such as ton aluminum electricity consumption, cell voltage drop and the like in aluminum electrolysis production are directly influenced. In addition, in order to reduce the production cost, some prebaked anode manufacturers add partial dust removal powder into the powder with particle size of prebaked anode, the dust removal powder is generally smaller than 20 mu m, and the specific surface area of the powder is larger; and, dust removal powders have less open macroporosity for coal pitch penetration. This reduces the ability of coal pitch to interlock and bond with it during the carbonization firing process. The prebaked anode prepared from the calcined coke powder material and the dust removal powder material is easier to crack by thermal shock in the rapid temperature rising process of the aluminum electrolysis cell, so that serious slag falling phenomenon is caused, and the normal operation of the aluminum electrolysis cell is influenced.
The prebaked anode production enterprises have increasingly difficult to purchase the proper anode grade raw petroleum coke at reasonable price, and the metal impurities and sulfur content in the prebaked anode grade raw petroleum coke are higher. In the aluminum electrolysis process, the current situation of the prebaked anode raw material inevitably leads to high air/CO 2 reactivity of the prebaked anode carbon blocks, increased carbon consumption, increased CO2 emission and low current efficiency.
Currently, in order to reduce the CO 2/air reactivity of the prebaked anode, an AlF3 and Al2O3 antioxidant is mainly added, or an oxidation resistance coating method of the prebaked anode is adopted; the graphite powder is mainly added for reducing the resistivity of the prebaked anode. Practice has shown that these methods have limited effectiveness.
The technological innovation of the aluminum industry is to adhere to green low-carbon emission reduction and environment-friendly bottom line, realize the aim of carbon-to-carbon neutralization, and effectively reduce the resistivity of anode carbon blocks, reduce the air/CO 2 reactivity of the anode carbon blocks, reduce the consumption of carbon anodes, reduce the emission of CO2 and improve the current efficiency in the production of electrolytic aluminum.
Noun interpretation; coal pitch is classified by softening point: the low-temperature coal tar pitch, the medium-temperature coal tar pitch and the modified coal tar pitch, wherein the modified coal tar pitch has a softening point of 103-125 ℃, ash content of less than or equal to 0.3%, coking value of more than or equal to 56%, volatile matters of 48-54%, carbon content of more than or equal to 50%, toluene insoluble matters of 28-32% and quinoline insoluble matters of 4-10%. The modified coal pitch is also called coal tar pitch, and is the product of coal tar after high temperature distillation and debenzolization.
Disclosure of Invention
Based on the background situation, in order to solve the technical problems, the auxiliary materials in the negative graphitization furnace are used as powder materials in the particle grading of the prebaked anode, and the prebaked anode capable of effectively reducing the reactivity of air and CO2 of the anode carbon block and the resistivity of the prebaked anode and the preparation method of the prebaked anode are provided.
The technical problems to be solved by the invention are realized by the following technical scheme:
The adopted technical scheme is as follows:
the high-quality prebaked anode comprises prebaked anode aggregate and a binder, wherein the mass ratio of the prebaked anode aggregate to the binder is 84:16; the pre-baked anode aggregate comprises >12mm calcined petroleum coke, 12-6mm calcined petroleum coke, 6-3mm calcined petroleum coke, <0.075mm calcined petroleum coke powder and <0.075mm graphitization furnace auxiliary materials.
Further improved, the prebaked anode aggregate comprises 8wt% of calcined petroleum coke with the diameter of more than 12mm, 12wt% of calcined petroleum coke with the diameter of 12-6mm, 40-55wt% of calcined petroleum coke with the diameter of 6-3mm and 25-40wt% of graphitization furnace auxiliary materials with the diameter of less than 0.075 mm.
Further improved, the prebaked anode aggregate comprises 8wt% of calcined petroleum coke with the diameter of more than 12mm, 12wt% of calcined petroleum coke with the diameter of 12-6mm, 40wt% of calcined petroleum coke with the diameter of 6-3mm, 0-35wt% of calcined petroleum coke powder with the diameter of less than 0.075mm and 5-40wt% of graphitization furnace auxiliary materials with the diameter of less than 0.075 mm.
Further improves, in the auxiliary materials of the graphitization furnace with the diameter of less than 75 mu m, the purity of the powder is more than or equal to 60 percent, and the purity of the powder with the diameter of less than 38 mu m is less than or equal to 40 percent.
Further improvement, the auxiliary material of the graphitization furnace is one of a covering material of the graphitization furnace and a resistance material of the graphitization furnace; the raw materials of the graphitizing furnace resistor material are fillers between carbon products and gaps between the carbon products and furnace walls when the graphitizing furnace is charged, the fillers are calcined petroleum coke, and the fillers are graphitizing furnace resistor materials after graphitizing the carbon products; when the raw material of the graphitizing furnace coverage material is the graphitizing furnace charging, the calcined petroleum coke with the thickness of 150-200mm is paved on the top of the carbon product, and after graphitizing of the carbon product is completed, the calcined petroleum coke is the graphitizing furnace coverage material.
Further improved, the binder is melt-modified coal pitch.
A preparation method of a high-quality prebaked anode comprises the following steps: adding the prebaked anode aggregate into a kneader for kneading for 10min, adding modified coal pitch for kneading for 20min, and carrying out kneading at 170-175 ℃ to prepare a paste, wherein the paste is formed by compression molding: molding temperature 145 ℃, molding pressure: 50MPa, dwell time: preparing a pre-baked anode green body after 1min, placing the pre-baked anode green body into a roasting furnace for roasting, and cooling and discharging to obtain the high-quality pre-baked anode, wherein the pre-baked anode aggregate comprises >12mm calcined petroleum coke, 12-6mm calcined petroleum coke, 6-3mm calcined petroleum coke, <0.075mm calcined petroleum coke powder and <0.075mm graphitization furnace auxiliary materials.
Further improved, the roasting method is to heat up to 150 ℃ from room temperature at a heating rate of 100 ℃/h, then heat up to 300 ℃ at a heating rate of 10 ℃/h, heat up to 1100 ℃ at a heating rate of 50 ℃/h, heat preservation for 20h, and natural cooling.
Further improved, the prebaked anode aggregate comprises 8wt% of calcined petroleum coke with the diameter of more than 12mm, 12wt% of calcined petroleum coke with the diameter of 12-6mm, 40wt% of calcined petroleum coke with the diameter of 6-3mm, 0-35wt% of calcined petroleum coke powder with the diameter of less than 0.075mm and 5-40wt% of graphitization furnace auxiliary materials with the diameter of less than 0.075 mm.
Further improved, the auxiliary material of the graphitization furnace is one of a covering material of the graphitization furnace and a resistance material of the graphitization furnace, and the binder is modified coal pitch.
The beneficial effects of the invention are as follows:
the high-quality prebaked anode can effectively reduce the air/CO 2 reactivity of the anode carbon blocks, reduce the resistivity of the prebaked anode, reduce the consumption of the carbon anode, reduce the emission of CO2 and improve the current efficiency.
Drawings
Figure 1 shows XRD of petroleum coke and graphitization furnace auxiliary materials in the invention.
FIG. 2a is a diagram of calcined petroleum coke TG/DTG according to the invention.
FIG. 2b is a graph of graphitization furnace coverage TG/DTG according to the present invention.
FIG. 2c is a graph of graphitized furnace resistance TG/DTG according to the present invention.
FIG. 3 is a graph showing the baking temperature of the prebaked anode according to the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention as defined in the claims.
In order to further explain the technical means and effects adopted by the invention to achieve the preset purpose, the following describes in detail a preparation method of a high-quality prebaked anode according to the invention with reference to the attached drawings and examples:
comprises prebaked anode aggregate and binder, and the prebaked anode aggregate and the binder are mixed and stirred to form paste. Wherein the prebaked anode aggregate adopts four-grade proportion: 12mm calcined petroleum coke (8 wt%), 12-6mm calcined petroleum coke (12 wt%), 6-3mm calcined petroleum coke (40-55 wt%), and <0.075mm graphitization furnace auxiliary material (25-40 wt%), wherein the pre-baked anode aggregate is 84wt% of the total weight of the paste; the amount of the coal tar pitch binder is 16wt% of the total weight of the paste, and the softening point of the modified coal tar pitch is 105 ℃.
840G of aggregate according to the four-grain proportion is added into a kneader to be kneaded for 10min, 160g of modified coal pitch is added to be kneaded for 20min, and the kneading temperature is 170-175 ℃ to prepare the paste.
The paste is molded: molding temperature 145 ℃, molding pressure: 50MPa, dwell time: and (3) preparing a pre-baked anode green body for 1 min.
And (3) placing the anode green body into a roasting furnace, roasting according to a roasting temperature curve shown in fig. 3, and cooling and discharging to obtain the prebaked anode for high-quality aluminum electrolysis.
The material compositions and specific gravities used in the examples are shown in Table 1:
Table 1 graphitizing furnace auxiliary material and calcined petroleum coke trace elements
Example 1
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12 wt%, 6-3mm calcined petroleum coke 40wt%, 35wt% of <0.075mm calcined petroleum coke powder and <0.075mm graphitization furnace resistor 5wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y1 is obtained.
Example 2
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12 wt%, 6-3mm calcined petroleum coke 40wt%, 25wt% of <0.075mm calcined petroleum coke powder and <0.075mm graphitization furnace resistor 15wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y2 is obtained.
Example 3
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12 wt%, 6-3mm calcined petroleum coke 40wt%, 15wt%, 0.075mm calcined petroleum coke powder, and 0.075mm graphitization furnace resistor 25wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y3 is obtained.
Example 4
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12t%, 6-3mm calcined petroleum coke 40wt%, 0.075mm calcined petroleum coke powder 5wt%, and 0.075mm graphitization furnace resistor 35wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y4 is obtained.
Example 5
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 8wt% of 12mm calcined petroleum coke, 12t% of 12-6mm calcined petroleum coke, 40wt% of 6-3mm calcined petroleum coke and 40wt% of <0.075mm graphitization furnace resistor material. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y5 is obtained.
Example 6
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12t%, 6-3mm calcined petroleum coke 40wt%, 0.075mm calcined petroleum coke powder 15wt%, and 0.075mm graphitization furnace cover 25wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y6 is obtained.
Example 7
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12t%, 6-3mm calcined petroleum coke 40wt%, 0.075mm calcined petroleum coke powder 10wt%, and 0.075mm graphitization furnace cover 30wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y7 is obtained.
Example 8
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12t%, 6-3mm calcined petroleum coke 40wt%, 0.075mm calcined petroleum coke powder 5wt%, and 0.075mm graphitization furnace cover 35wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y8 is obtained.
Example 9
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 12mm calcined petroleum coke 8wt%, 12-6mm calcined petroleum coke 12 wt%, 6-3mm calcined petroleum coke 40wt%, and <0.075mm graphitization furnace cover 40wt%. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y9 is obtained.
Example 10 (control)
According to the preparation method of the prebaked anode for aluminum electrolysis, the prebaked anode aggregate adopts four-grain proportion: 8wt% of 12mm calcined petroleum coke, 12t% of 12-6mm calcined petroleum coke, 40wt% of 6-3mm calcined petroleum coke and 40wt% of <0.075mm calcined petroleum coke powder. Wherein, the powder purity is less than 75 mu m and 60%, the powder purity with the particle diameter less than 38 mu m is 10%, and the prebaked anode y10 is obtained.
Performance tests were conducted on prebaked anodes y1 to y10 for electrolysis of alumina, and the test results are shown in the following table:
As can be seen from the performance test results of y1-y5, the resistivity of the prebaked anode is reduced, the compressive strength is increased, and the air-air reaction residual rate and the CO2 reaction residual rate are increased along with the increase of the electric resistance material consumption of the graphitization furnace with the thickness of <0.075 mm; however, the amount of the resistance material of the graphitization furnace of <0.075mm is 40wt%, the resistivity of the prebaked anode is increased, and the compressive strength, the air-air reaction residual rate and the CO2 reaction residual rate are reduced. Therefore, the amount of the resistor material of the graphitization furnace with the thickness of <0.075mm is preferably less than or equal to 40 wt%.
As can be seen from the performance test results of y6-y9, as the amount of the covering material of the graphitization furnace with the thickness of <0.075mm is increased, the resistivity of the prebaked anode is reduced, the compressive strength is increased, and the air-air reaction residual rate and the CO2 reaction residual rate are increased; however, the amount of the covering material of the graphitization furnace with the thickness of <0.075mm is 40wt%, the resistivity of the prebaked anode is increased, and the compressive strength, the air-air reaction residual rate and the CO2 reaction residual rate are reduced. Therefore, the coating material amount of the graphitization furnace with the thickness of <0.075mm is preferably less than or equal to 40 weight percent.
Compared with the prior art, the pre-baked anode provided by the invention can effectively reduce the resistivity, reduce the air and CO2 reactivity of the anode carbon block in the electrolytic aluminum production, effectively reduce the consumption of the carbon anode and reduce the CO2 emission.
The present invention is not limited to the preferred embodiments, and any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention will fall within the scope of the technical principles of the present invention, as will be apparent to those skilled in the art without departing from the scope of the technical principles of the present invention.
The above-described series of detailed descriptions are merely specific illustrations of possible embodiments of the invention, which are not intended to limit the scope of the invention, and various changes made by those skilled in the art without departing from the spirit of the invention.
Claims (9)
1. The high-quality prebaked anode is characterized in that the mass ratio of the prebaked anode aggregate to the binder is 84:16; the pre-baked anode aggregate comprises >12mm calcined petroleum coke, 12-6mm calcined petroleum coke, 6-3mm calcined petroleum coke, <0.075mm calcined petroleum coke powder and <0.075mm graphitization furnace auxiliary materials.
2. The premium prebaked anode of claim 1, wherein the prebaked anode aggregate comprises 8wt% of >12mm calcined petroleum coke, 12wt% of 12-6mm calcined petroleum coke, 40wt% of 6-3mm calcined petroleum coke, 0-35wt% of <0.075mm calcined petroleum coke powder, 5-40wt% of <0.075mm graphitization furnace adjuvants.
3. The high-quality prebaked anode of claim 2, wherein the powder material with particle size less than 75 μm in the auxiliary material of the graphitization furnace with particle size less than 38 μm has purity of not less than 60% and purity of not more than 40%.
4. The high quality prebaked anode of claim 1 wherein the graphitization furnace excipients are one of graphitization furnace coating materials and graphitization furnace resistor materials; the raw materials of the graphitizing furnace resistor material are fillers between carbon products and gaps between the carbon products and furnace walls when the graphitizing furnace is charged, the fillers are calcined petroleum coke, and the fillers are graphitizing furnace resistor materials after graphitizing the carbon products; when the raw material of the graphitizing furnace coverage material is the graphitizing furnace charging, the calcined petroleum coke with the thickness of 150-200mm is paved on the top of the carbon product, and after graphitizing of the carbon product is completed, the calcined petroleum coke is the graphitizing furnace coverage material.
5. The high quality prebaked anode of claim 1 wherein the binder is a upgraded coal pitch.
6. The preparation method of the high-quality prebaked anode is characterized by comprising the following steps: adding the prebaked anode aggregate into a kneader for kneading for 10min, adding modified coal pitch for kneading for 20min, and carrying out kneading at 170-175 ℃ to prepare a paste, wherein the paste is formed by compression molding: molding temperature 145 ℃, molding pressure: 50MPa, dwell time: preparing a pre-baked anode green body after 1min, placing the pre-baked anode green body into a roasting furnace for roasting, and cooling and discharging to obtain the high-quality pre-baked anode, wherein the pre-baked anode aggregate comprises >12mm calcined petroleum coke, 12-6mm calcined petroleum coke, 6-3mm calcined petroleum coke, <0.075mm calcined petroleum coke powder and <0.075mm graphitization furnace auxiliary materials.
7. The method for producing a high-quality prebaked anode according to claim 6, wherein the baking process is performed by heating from room temperature to 150℃at a heating rate of 100℃per hour, then heating to 300℃at a heating rate of 10℃per hour, then heating to 1100℃at a heating rate of 50℃per hour, and maintaining the temperature for 20 hours, and naturally cooling.
8. The method of preparing a high quality prebaked anode of claim 6 wherein the prebaked anode aggregate comprises 8wt% of >12mm calcined petroleum coke, 12wt% of 12-6mm calcined petroleum coke, 40wt% of 6-3mm calcined petroleum coke, 0-35wt% of <0.075mm calcined petroleum coke powder, 5-40wt% of <0.075mm graphitization furnace auxiliary materials.
9. The method for preparing a high-quality prebaked anode according to claim 6, wherein the auxiliary material of the graphitization furnace is one of a covering material of the graphitization furnace and a resistance material of the graphitization furnace, and the binder is modified coal pitch.
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