CN118084493A - Graphite coke electrode of submerged arc furnace and preparation process - Google Patents
Graphite coke electrode of submerged arc furnace and preparation process Download PDFInfo
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- 239000000571 coke Substances 0.000 title claims abstract description 158
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 147
- 239000010439 graphite Substances 0.000 title claims abstract description 141
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- 238000005087 graphitization Methods 0.000 claims abstract description 26
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- 239000007770 graphite material Substances 0.000 claims abstract description 14
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a graphite coke electrode of an ore furnace, which comprises the following components: the graphite coke material and the coal pitch are calculated according to the weight percentage, the graphite coke material accounts for 65-85% of the total weight, the coal pitch accounts for 15-35% of the total weight, and the graphitization degree of the graphite coke material is more than 70%. The invention also provides a preparation process of the graphite coke electrode of the submerged arc furnace, wherein calcined coke is crushed into proper granularity and graphitized into graphitized coke, the graphitized coke and the graphite material with the graphitized degree of more than 70% of crushed graphitized coke are used as graphite coke materials, the mixture is added into coal pitch according to the proportion, the mixture is kneaded, cooled, and subjected to Wen materials, the obtained paste is subjected to vibration molding, cooling and demolding, the demolded raw product is subjected to roasting processing after being inspected to be qualified, and the baked semi-finished product is subjected to machining after being inspected to be qualified to obtain the graphite coke electrode of the submerged arc furnace.
Description
Technical Field
The invention relates to the technical field of submerged arc furnace electrodes, in particular to a submerged arc furnace graphite coke electrode and a preparation process thereof.
Background
The submerged arc furnace electrode is a functional material which is necessary for smelting industrial silicon, ferroalloy, yellow phosphorus and calcium carbide by a submerged arc furnace carbonaceous reduction method. At present, a submerged arc furnace commonly uses carbon electrodes, solid materials required for preparing the carbon electrodes comprise graphite blocks, thermal insulation coke (thermal insulation material calcined coke used in the graphitization process of a lithium battery graphite cathode material), calcined coke and liquid material coal pitch, and the technological processes comprise mixing ingredients, paste kneading, paste cooling, paste temperature homogenizing, weighing, vibration forming, cooling, roasting cleaning, machining, checking and storing in sequence, wherein the volume density of the carbon electrodes prepared by adopting the mixing and technology is lower than 1.62g/cm, the flexural strength is lower than 7MPa, the resistivity is higher than 35 mu Q.m, the carbon electrodes are easy to crack and break in the use process, and the oxidation consumption is high. These phenomena of carbon electrodes affect the normal operation of the submerged arc furnace smelting process to different extents.
Disclosure of Invention
In order to solve the problems of the electrode of the submerged arc furnace in the prior art, the invention provides a graphite coke electrode of the submerged arc furnace and a preparation process.
The technical scheme of the invention is realized as follows:
a submerged arc furnace graphite coke electrode comprising: the graphite coke material and the coal pitch account for 65-85% of the total weight, and the coal pitch accounts for 15-35% of the total weight; the graphitization degree of the graphite coke material is more than 70 percent.
Preferably, the graphite coke material comprises a graphite coke material with the granularity of less than 24mm and more than 4mm, a graphite coke material with the granularity of more than 2mm and less than 4mm, a graphite coke material with the granularity of more than 1mm and less than 2mm, a graphite coke material with the granularity of more than 0.075mm and less than 1mm, and a graphite coke material with the granularity of less than 0.075 mm.
A preparation process of the graphite coke electrode of the submerged arc furnace comprises the steps of selecting calcined coke, crushing the calcined coke into proper granularity, graphitizing the crushed calcined coke into graphitized coke, screening and grading the graphitized coke and the crushed graphite material with the graphitization degree of more than 70% as the graphite coke material, proportioning according to the grading granularity of the graphite coke material, adding coal pitch into the proportioning for mixing and kneading, cooling the kneaded paste, homogenizing the cooled paste, vibrating and molding the well-mixed paste, cooling and demolding the molded product, roasting the molded product after qualified inspection, machining the semi-finished product after roasting, and obtaining the graphite coke electrode of the submerged arc furnace after qualified inspection.
Preferably, the calcined coke with proper crushed granularity accounts for 40-70% of the total weight of the calcined coke with granularity more than 0.075mm and less than 4mm, 20-35% of the total weight of the calcined coke with granularity less than 0.075mm, and 10-25% of the total weight of the calcined coke with granularity more than 4mm and less than 24 mm.
Preferably, the method for graphitizing the crushed calcined coke comprises the following steps: and (3) carrying out high-temperature treatment at 1500-3000 ℃ on the crushed calcined coke in a graphitization furnace, wherein the graphitization degree is more than 70%, so that the graphitized coke with the planar hexagonal lamellar structure is formed.
Preferably, the mode of batching according to the grading granularity of the graphite coke material is an embedded compaction grading method, which specifically comprises the following steps: firstly, filling graphite coke materials with the granularity of more than 4mm and less than 24mm into a container for full vibration, determining the volume base, then adding the graphite coke materials with the granularity of more than 2mm and less than 4mm into the container for stirring vibration on the premise of ensuring the volume base to be unchanged, then adding the graphite coke materials with the granularity of more than 1mm and less than 2mm into the container for stirring vibration, adding the graphite coke materials with the granularity of more than 0.075mm and less than 1mm into the container for stirring vibration, and finally adding the graphite coke materials with the granularity of less than 0.075mm into the container for stirring vibration;
The graphite coke materials with different granularities account for 10% -25% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 4mm and smaller than 24mm account for 20% -30% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 2mm and smaller than 4mm account for 5% -15% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 1mm and smaller than 2mm account for 15% -25% of the total weight of the graphite coke materials, and the graphite coke materials with granularities smaller than 0.075mm account for 20% -35% of the total weight of the graphite coke materials.
Preferably, the coal pitch is added into the ingredients according to the proportion for kneading, and the method comprises the following steps: the total weight of the coal pitch accounts for 25% -43% of the total weight of all graphite coke ingredients, and the coal pitch is fully soaked into micropores of graphitized coke and graphite materials by fully stirring and kneading in a kneading pot to form an asphalt film on the surface.
Preferably, the method for cooling and demolding the molded product is as follows: and simultaneously cooling the vibration-molded metal mold and the product, and greatly shrinking the metal mold to enable the product in the metal mold to be subjected to holding shrinkage densification once again.
Preferably, the unqualified and demolded raw product is crushed into proper granularity to be directly mixed, and the unqualified and demolded semi-finished product is crushed into proper granularity to be screened and graded; the ash content of the graphite coke electrode of the submerged arc furnace after being inspected to be qualified is 0.5-2.0%, the volume density is 1.62-1.68g/cm, the breaking strength is 10-16Mpa, the resistivity is 21-27 mu Q.m, the thermal expansion coefficient is 3.5x -6-3.8×10-6 K, the thermal conductivity is 20-30W/(m.K), and the quantity of particles with the granularity larger than 0.5mm can be observed by naked eyes within 200 square centimeters and is larger than 1500.
The beneficial effects of the invention are as follows: the graphite coke electrode of the submerged arc furnace only uses one solid raw material, namely the graphite coke material, can ensure that the product cannot cause problems due to the performance difference of the product under very severe working environment, avoids the problems caused by the performance difference of more than two solid raw materials, and can better adapt to abrupt changes from normal temperature to high temperature.
According to the preparation process of the graphite coke electrode of the submerged arc furnace, graphitization is performed after calcination Jiao Chushi is a subverted process in the carbon industry, graphitization is performed on calcined coke, an amorphous structure is converted into a graphite structure with excellent performance, energy consumption is reduced through a subsequent preparation process, the performance of the finished electrode is greatly improved, the breakage rate is reduced to 2 per mill from 2% of the carbon electrode in the prior art, the unit consumption is reduced to 50kg from 90kg, and the stokehole breakage proportion and the oxidation consumption are greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of a preparation process of a graphite coke electrode of an submerged arc furnace according to embodiment 2 of the present invention;
fig. 2 is a flowchart of a preparation process of a graphite coke electrode of an submerged arc furnace according to embodiment 4 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: a submerged arc furnace graphite coke electrode comprising: the graphite coke material and the coal pitch account for 65-85% of the total weight, and the coal pitch accounts for 15-35% of the total weight; the graphitization degree of the graphite coke material is more than 70 percent. The graphite coke materials comprise graphite coke materials with the granularity of more than 4mm, graphite coke materials with the granularity of more than 2mm and less than 4mm, graphite coke materials with the granularity of more than 1mm and less than 2mm, graphite coke materials with the granularity of more than 0.075mm and less than 1mm and graphite coke materials with the granularity of less than 0.075 mm. The graphite coke material is prepared by adopting graphite coke materials with different grades of granularity, so that the breaking strength of the graphite coke electrode of the submerged arc furnace is improved.
The graphite coke material comprises graphitized coke and other graphite materials with graphitization degree of more than 70%, and the graphite coke material can be waste of graphite products, furnace dropping electrodes and graphite waste. The graphite coke material can be single graphitized coke or broken graphite or other materials, or can be a mixture.
The application scene condition of the submerged arc furnace electrode is very harsh, the submerged arc furnace electrode is fixed by a holder, one part of the submerged arc furnace electrode is positioned in the height Wen Luda of the submerged arc furnace, after the submerged arc furnace electrode is added with huge current and is conductive, the temperature of the submerged arc furnace electrode is increased to more than two thousand degrees from a position with the length of only 2 meters, the temperature gradient is large, so that the interior of the submerged arc furnace electrode generates extremely large thermal stress, and the huge current generates strong magnetic force, so that the submerged arc furnace electrode has extremely high requirements on the quality of the submerged arc furnace electrode when working in the environment. The graphite coke electrode of the submerged arc furnace only uses one solid material, namely the graphite coke material, so that the product can be ensured not to be broken due to larger thermal stress generated by temperature change due to own performance difference under very severe working environment. Each electrode fracture is a smelting accident, the broken electrode is required to be salvaged by stopping the furnace, equipment and personal accidents even occur even if the operation is improper in the period, and the reduction of the breakage rate is a great technical progress.
Example 2: as shown in figure 1, the preparation process of the graphite coke electrode of the submerged arc furnace comprises the steps of selecting calcined coke, crushing the calcined coke into proper granularity, carrying out high-temperature treatment at 1500-3000 ℃ on the crushed calcined coke in a graphitization furnace, enabling graphitization degree to be more than 70%, forming graphitization coke with a planar hexagonal layered structure, mixing the graphitization coke according to the grading granularity, adding coal asphalt accounting for 25% of the total graphite coke mixing amount by weight into a mixing pot for mixing and kneading, carrying out cooling on the kneaded paste, carrying out uniform temperature softening on the cooled paste, carrying out vibration molding on the well-prepared paste, cooling and demolding a molded product, carrying out roasting processing on a semi-finished product after the demolding, and carrying out machining after the roasting is qualified, thus obtaining the graphite coke electrode of the submerged arc furnace after the inspection is qualified.
According to the preparation process disclosed by the invention, the materials are mixed according to the grading granularity, so that the flexural strength can be enhanced. Adding coal pitch for kneading, so that the coal pitch is fully infiltrated into micropores of graphitized coke to improve the adhesiveness, thereby being beneficial to more generation of adhesive coke in the polycondensation in the roasting process and improving various properties of the product. After the material is fermented at the uniform temperature, the vibration molding is facilitated. The purpose of the roasting processing is that volatile gas can be removed, a binder is coked, a product is coked and shaped, the resistivity is reduced, the volume is further contracted, and the physical, chemical and mechanical properties of a semi-finished product are further improved.
The calcined coke with the granularity of more than 0.075mm and less than 4mm accounts for 40-70 percent of the total weight, the calcined coke with the granularity of less than 0.075mm accounts for 20-35 percent of the total weight, and the calcined coke with the granularity of more than 4mm and less than 24mm accounts for 10-25 percent of the total weight, which is convenient for screening classification.
The method comprises the steps of preparing graphitized coke according to the grading granularity by an embedded compaction grading method, firstly filling graphite coke materials with granularity larger than 4mm and smaller than 24mm into a container for full vibration, determining the volume base, then adding graphite coke materials with granularity larger than 2mm and smaller than 4mm into the container for stirring and vibrating on the premise of ensuring the volume base unchanged, then adding graphite coke materials with granularity larger than 1mm and smaller than 2mm into the container for stirring and vibrating, adding graphite coke materials with granularity larger than 0.075mm and smaller than 1mm into the container for stirring and vibrating, and finally adding graphite coke materials with granularity smaller than 0.075mm into the container for stirring and vibrating; the graphite coke materials with different granularities account for 10% -25% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 4mm and smaller than 24mm account for 20% -30% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 2mm and smaller than 4mm account for 5% -15% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 1mm and smaller than 2mm account for 15% -25% of the total weight of the graphite coke materials, and the graphite coke materials with granularities smaller than 0.075mm account for 20% -35% of the total weight of the graphite coke materials. The proportioning mode applies the principle of ball stress dispersion, selects larger particles to block the thermal stress generated by the product in the application scene, and generates the irregularity of the graphite coke material, so that the raw product has higher flexural strength and improves the thermal shock resistance index.
The total weight of the coal pitch accounts for any value between 25 percent and 43 percent of the total weight of all graphite coke ingredients, and the kneading is carried out in a kneading pot through full stirring and kneading, so that the coal pitch is fully infiltrated into micropores of graphitized coke, and an asphalt film is formed on the surface, so that the coal pitch can be well adhered together, and the cohesiveness is improved.
The method for cooling and demoulding the formed product comprises the following steps: and simultaneously cooling the vibration-molded metal mold and the product, and greatly shrinking the metal mold to enable the product in the metal mold to be subjected to holding shrinkage densification once again. The mould is made of metal, the thermal expansion coefficient of the metal is far greater than that of a nonmetal material, and the product in the mould is again held and compacted for one time along with the great shrinkage of the mould made of the metal material, so that the performance of the product is improved.
Crushing the unqualified and demolded raw product into proper granularity, directly mixing, crushing the unqualified and demolded semi-finished product into proper granularity, screening and grading, wherein the proper granularity is consistent with the proper granularity of calcined coke crushing; the ash content of the graphite coke electrode of the submerged arc furnace after being inspected to be qualified is 0.5-2.0%, the volume density is 1.62-1.68g/cm, the breaking strength is 10-16Mpa, the resistivity is 21-27 mu Q.m, the thermal expansion coefficient is 3.5x -6-3.8×10-6 K, the thermal conductivity is 20-30W/(m.K), and the quantity of particles with the granularity larger than 0.5mm can be observed by naked eyes within 200 square centimeters and is larger than 1500. The electrode prepared in example 2 has better performance.
The material cooling, material softening and vibration forming in the preparation process are modes in the prior art, the material cooling is carried out in a material cooling machine, the material softening is carried out in order to exhaust asphalt smoke, the material softening is carried out in order to carry out vibration forming, the material after softening is carried out in a mould preheated in a vibration forming machine at a proper temperature, and the material is subjected to vibration, vacuum and hydraulic forming. The crushed granularity is consistent with the granularity of the classification of the graphite coke material.
In example 2, the calcined coke was crushed before graphitization to enhance graphitization degree and to make the performance more stable. The preparation process of the invention is a subverted process in the carbon industry when graphitizing is carried out initially, and the calcined coke is converted into a planar hexagonal graphite structure from an amorphous structure after graphitizing, so that the electrode performance of a finished product is greatly improved, the breakage rate is reduced to 2 per mill from 2% of the carbon electrode in the prior art, and the unit consumption is reduced to 50kg from 90 kg.
Example 3: a process for preparing graphite coke electrode of ore-smelting furnace includes such steps as proportioning broken graphite material with graphitization degree greater than 70% according to granularity, mixing coal asphalt with said mixture (43% of coal asphalt) in kneading pot, cooling, homogenizing, vibration shaping, cooling, demoulding, baking, machining, and checking.
Example 3 is the replacement of graphitized coke in example 2 with a graphite material having a graphitization degree of greater than 70%,
The crushed particle size of the graphite material is identical to the proper particle size of the calcined coke of example 2, and the graphite material is prepared in the same manner as the graphitized coke of example 2 according to the classification of particles. The total weight of the coal pitch accounts for any value between 25 percent and 43 percent of the total weight of all graphite coke ingredients, and the kneading is carried out in a kneading pot through full stirring and kneading, so that the coal pitch is fully infiltrated into micropores of a graphite material, and an asphalt film is formed on the surface, so that the coal pitch can be well adhered together, and the cohesiveness is improved. Crushing the unqualified demoulded raw product into proper granularity and directly blending; and crushing the unqualified baked semi-finished product into proper granularity for screening and grading.
The performance of the graphite coke electrode of the submerged arc furnace prepared in the embodiment 3 is not higher than that of the graphite coke electrode of the submerged arc furnace prepared in the embodiment 2, but is stronger than that of the electrode of the submerged arc furnace in the prior art, and the graphite coke electrode of the submerged arc furnace reaches the inspection qualification standard of the invention. The qualification criteria were the same as in example 2.
The graphite material with graphitization degree more than 70% can be graphite blocks or broken graphite, waste of graphite products, furnace electrode and waste of graphite.
Example 4: as shown in figure 2, the preparation process of the graphite coke electrode of the submerged arc furnace comprises the steps of selecting calcined coke, crushing the calcined coke into proper granularity, carrying out high-temperature treatment at 1500-3000 ℃ on the crushed calcined coke in a graphitization furnace, forming graphitized coke with a planar hexagonal layered structure, mixing graphitized coke and graphite materials with the graphitization degree of more than 70%, then batching according to the grading granularity, adding coal asphalt accounting for 25% of the total graphite coke batching by weight into a mixing kneading pot for kneading, cooling the kneaded paste, carrying out homogenization softening, carrying out vibration molding on the obtained paste, cooling and demolding the molded product, carrying out roasting processing on the demolded raw product after inspection, carrying out machining on the semi-finished product after roasting, and obtaining the graphite coke electrode of the submerged arc furnace after inspection.
Example 4 the graphitized coke of example 2 was replaced with a mixture of graphitized coke and a graphite material having a degree of graphitization of greater than 70%, and the other preparation processes were the same as in example 2. The performance of the graphite coke electrode of the submerged arc furnace prepared in the example 4 is not higher than that of the graphite coke electrode of the submerged arc furnace in the example 2, but is stronger than that of the graphite coke electrode of the submerged arc furnace in the example 3, and the standard of the submerged arc furnace meets the inspection qualification of the invention. The qualification criteria were the same as in example 2.
The performances of the submerged arc furnace electrodes prepared by the conventional process of the prior art are compared with those of submerged arc furnace graphite coke electrodes prepared in example 2, example 3 and example 4, respectively, and the comparison results are shown in table 1.
TABLE 1
As can be seen from Table 1, the flexural strength of the graphite coke electrode of the submerged arc furnace prepared by the preparation process of the invention is more than 14Mpa, the flexural strength of the conventional submerged arc furnace electrode is less than 10Mpa, usually 7Mpa, the graphite coke electrode of the submerged arc furnace obviously improves the flexural strength, improves the thermal shock resistance index, and greatly reduces the front fracture ratio and the oxidation consumption.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A graphite coke electrode for a submerged arc furnace, comprising: the graphite coke material and the coal pitch account for 65-85% of the total weight, and the coal pitch accounts for 15-35% of the total weight; the graphitization degree of the graphite coke material is more than 70 percent.
2. The graphite coke electrode of the submerged arc furnace according to claim 1, wherein the graphite coke material comprises a graphite coke material with the granularity of less than 24mm and more than 4mm, a graphite coke material with the granularity of more than 2mm and less than 4mm, a graphite coke material with the granularity of more than 1mm and less than 2mm, a graphite coke material with the granularity of more than 0.075mm and less than 1mm, and a graphite coke material with the granularity of less than 0.075 mm.
3. A process for preparing a graphite coke electrode for an ore furnace according to any one of claims 1 to 2, characterized by selecting calcined coke, crushing the calcined coke into proper granularity, graphitizing the crushed calcined coke into graphitized coke, screening and grading the graphitized coke and the crushed graphite material with the graphitization degree of more than 70% as graphite coke materials, proportioning according to the grading granularity of the graphite coke materials, adding coal pitch into the proportioning according to the proportioning, kneading, cooling the kneaded paste, homogenizing the cooled paste, vibrating the kneaded paste, cooling and demolding the molded product, roasting the molded product after qualified inspection, machining a semi-finished product after the roasting, and obtaining the graphite coke electrode for the ore furnace after qualified inspection.
4. A process according to claim 3, wherein the calcined coke is crushed to a suitable particle size, the calcined coke having a particle size of greater than 0.075mm and less than 4mm is present in an amount of 40% to 70% by weight, the calcined coke having a particle size of less than 0.075mm is present in an amount of 20% to 35% by weight, and the calcined coke having a particle size of greater than 4mm and less than 24mm is present in an amount of 10% to 25% by weight, based on the total weight.
5. A process according to claim 3, characterized in that the graphitizing of the crushed calcined coke is performed in such a way that: and (3) carrying out high-temperature treatment at 1500-3000 ℃ on the crushed calcined coke in a graphitization furnace, wherein the graphitization degree is more than 70%, so that the graphitized coke with the planar hexagonal lamellar structure is formed.
6. A process according to claim 3, wherein the batching is carried out according to the graded particle size of the graphite coke material by means of an embedded compaction grading method, in particular: firstly, filling graphite coke materials with the granularity of more than 4mm and less than 24mm into a container for full vibration, determining the volume base, then adding the graphite coke materials with the granularity of more than 2mm and less than 4mm into the container for stirring vibration on the premise of ensuring the volume base to be unchanged, then adding the graphite coke materials with the granularity of more than 1mm and less than 2mm into the container for stirring vibration, adding the graphite coke materials with the granularity of more than 0.075mm and less than 1mm into the container for stirring vibration, and finally adding the graphite coke materials with the granularity of less than 0.075mm into the container for stirring vibration;
The graphite coke materials with different granularities account for 10% -25% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 4mm and smaller than 24mm account for 20% -30% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 2mm and smaller than 4mm account for 5% -15% of the total weight of the graphite coke materials, the graphite coke materials with granularities larger than 1mm and smaller than 2mm account for 15% -25% of the total weight of the graphite coke materials, and the graphite coke materials with granularities smaller than 0.075mm account for 20% -35% of the total weight of the graphite coke materials.
7. The preparation process according to claim 3, wherein the coal pitch is added into the ingredients according to the proportion for kneading, and the method comprises the following steps: the total weight of the coal pitch accounts for 25% -43% of the total weight of all graphite coke ingredients, and the coal pitch is fully soaked into micropores of graphitized coke and graphite materials by fully stirring and kneading in a kneading pot to form an asphalt film on the surface.
8. A process according to claim 3, wherein the shaped article is cooled and demoulded by: and simultaneously cooling the vibration-molded metal mold and the product, and greatly shrinking the metal mold to enable the product in the metal mold to be subjected to holding shrinkage densification once again.
9. A process according to claim 3, wherein the unqualified demolded green product is crushed to a suitable particle size for direct dosing, and the unqualified baked semi-finished product is crushed to a suitable particle size for screening classification; the ash content of the graphite coke electrode of the submerged arc furnace after being inspected to be qualified is 0.5-2.0%, the volume density is 1.62-1.68g/cm, the breaking strength is 10-16Mpa, the resistivity is 21-27 mu Q.m, the thermal expansion coefficient is 3.5x -6-3.8×10-6 K, the thermal conductivity is 20-30W/(m.K), and the quantity of particles with the granularity larger than 0.5mm can be observed by naked eyes within 200 square centimeters and is larger than 1500.
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