84 results about "Coal Tar Pitches" patented technology

A dispersion, methods of making the same, applications of the dispersion to graphitic material and the resulting coated particles are disclosed. The dispersion includes ≤55% wt. coal tar pitch (softening point 100° C.-95° C.), ≤60% wt. dispersant, and the balance a non-aromatic solvent such as water or alcohol. Pitch particles in the dispersion are preferably ≤10 μm with a distribution of D50<15 μm. The pitch particles are micronized, such as by dry and / or wet milling with the dispersant and aqueous solvent to achieve the desired pitch particle size and distribution. This aqueous dispersion may be mixed with natural or synthetic graphitic material having a diameter of 5-20 μm in a ratio of 5%-30% pitch to graphite, dried and carbonized to form coated particles having a graphitic core at least partially coated by pitch particles.

The invention provides modified coal pitch, a preparation method and a prebaked anode, and belongs to the field of carbon anodes for aluminum. The method comprises the following steps: heating coal pitch to a set temperature; adding a modifier into the coal pitch with a set temperature to obtain a mixture; the mass ratio of the coal pitch to the modifier is (95-99): (1-5); and stirring the mixture for a set time at the set temperature so as to polymerize the light components and the short-chain components in the coal pitch to form long-chain macromolecules, thereby obtaining the modified coal pitch. By modifying the coal pitch, light components and short-chain components in the coal pitch can be polymerized into long-chain macromolecules, volatilization of the light components in the coking process of the coal pitch is reduced, and the coking value of the coal pitch is further increased. Therefore, the modified coal pitch is used for replacing traditional coal pitch to serve as a binder to prepare the prebaked anode, the coking value of the coal pitch can be effectively increased, the quality of the anode is improved, and a guarantee is provided for production of high-quality anodes.

The invention discloses coal pitch-based super capacitor carbon and a preparation method and application thereof, and the preparation method of the super capacitor carbon comprises the steps: dissolving coal liquefaction refined pitch in an organic solvent, and adding ZnCl2, KCl and potassium citrate to obtain a pitch solution containing an ionic hot molten salt activator; the preparation method comprises the following steps: soaking a biomass template in a dopamine aqueous solution, and then mixing with an asphalt solution to obtain a biomass template-asphalt compound; and oxidizing, carbonizing, activating, washing and drying the compound to obtain the capacitor carbon. And mixing and heating the capacitor carbon, a nitrogen source and a phosphorus source, and carrying out graphitization doping. The pitch-based super capacitor carbon with high specific surface area, excellent electrochemical performance and environmental protection advantages is prepared through a biomass template method, and the preparation process has great potential in the field of energy storage.

The invention discloses porous carbon with a gradient structure, a preparation method of the porous carbon and application of the porous carbon in a negative electrode of a lithium ion battery. The porous carbon has a gradient structure with compact micropores on the surface and loose macropores inside. The preparation method of the porous carbon comprises the following steps: carrying out oleophylic modification on SiO2 to obtain hydrophobic SiO2; carrying out hydrophilic coating on NH4Cl to obtain PVP (Polyvinyl Pyrrolidone) coated NH4Cl; the preparation method comprises the following steps: mixing coal pitch, methylbenzene, oleic acid, hydrophobic SiO2 and PVP (at) NH4Cl to form a suspension; preparing a spherical precursor by a micro-fluidic emulsification method; and carbonizing, sequentially carrying out oxygen plasma treatment and HF solution etching, and removing the template to obtain the porous carbon with the gradient structure. The gradient distribution of the template and the pore-forming agent is realized through surface modification difference and a microfluidic technology, the pore structure and the particle size can be accurately regulated and controlled, the process is simple, the compatibility is high, the prepared porous carbon can be used as a substrate for a silicon-carbon composite negative electrode material, the volume expansion of silicon can be effectively buffered, and the service life of the silicon-carbon composite negative electrode material is prolonged. And the first coulombic efficiency, the specific capacity and the cycling stability of the lithium ion battery are improved.

This invention provides a coal tar pitch-based nickel catalyst, its preparation method, and its application, belonging to the field of solid waste resource recycling and synthetic carbon materials technology. This invention uses a mixed roasting method to prepare a coal tar pitch-based nickel catalyst with micropores and mesopores from the residual coal tar pitch after coal tar extraction. The synergistic effect of active nickel as an active site and the functional groups on the support surface significantly improves its catalytic liquefaction performance, exhibiting the advantages of "low cost, high temperature resistance, and strong adaptability." The preparation method provided by this invention not only offers an effective way for the high-value recycling of coal tar pitch but also provides a low-cost material for green conversion, environmental governance, catalysis, and other fields. It represents a green resource utilization strategy with significant economic and environmental benefits and broad commercial prospects.

The present invention relates to a method for preparing high-performance coal-based needle coke by pyrolysis. The method uses coal tar pitch as the raw material, adds a polymerization promoter containing sulfur elements for thermal polymerization soaking, and then raises the temperature for pyrolysis. The raw material after pyrolysis is separated by flash evaporation to separate the heavy-phase asphalt and the raw material asphalt. The raw material asphalt is further separated by fractional distillation to separate the polymerization promoter and produce refined asphalt. The refined asphalt is calcined by coking to obtain a needle coke product. The present invention pre-treats the raw material by means of high-temperature soaking pyrolysis, effectively retains all beneficial components in the coal tar pitch, and the prepared needle coke has low sulfur and low CTE, and the quality is stable.

This application provides a method for preparing ferrocoke using zinc-containing dust and lean coal, belonging to the fields of iron and steel metallurgy and low-carbon ironmaking technology. The method uses zinc-containing dust and lean coal as raw materials, adding 10% medium-temperature coal tar pitch as a binder by weight of the total ferrocoke. During the ferrocoke preparation process, the metallic elements and their oxides in the zinc-containing dust can promote the reaction between carbon and CO2 at high temperatures, making carbon more easily consumed. Simultaneously, Zn volatilizes and migrates under high-temperature reducing conditions, making the local carbon structure loose and gradually forming interconnected pore structures around the dust particles. These pores facilitate the entry of CO2 gas into the ferrocoke to participate in the reaction, while also helping the generated gas to be discharged in a timely manner, thereby reducing mass transfer resistance. Through this effect, not only is the gasification reaction process accelerated, but the overall reaction performance of the ferrocoke is also improved, giving it higher gasification efficiency, making it suitable for blast furnaces, reducing the coke ratio, and improving smelting efficiency.

The application relates to the technical field of lithium battery cartridge manufacturing, and particularly discloses a short-fiber carbon fiber reinforced carbon-carbon cartridge and a preparation method thereof. The short-fiber carbon fiber reinforced carbon-carbon cartridge comprises the following raw materials in parts by weight: 15-45 parts of chopped carbon fibers, 38-63 parts of carbon powder or graphite powder, 10-40 parts of resin, 10-20 parts of coal tar pitch and 10-30 parts of fillers. The preparation method of the short-fiber carbon fiber reinforced carbon-carbon cartridge comprises the following steps: S1, stirring and mixing raw materials to obtain a mixture for standby; S2, placing the mixture obtained in S1 in a product mold and hot-pressing to form; S3, placing the semi-finished product hot-pressed in S2 in a high-temperature furnace for carbonization, and keeping vacuum or filling protective gas during the carbonization process; and S4, placing the semi-finished product carbonized in S3 in a high-temperature deposition furnace for CVI gas phase deposition to deposit a C coating, so as to obtain the short-fiber carbon fiber carbon-carbon cartridge.

The present invention belongs to the technical field of coal tar fractionation and utilization, and relates to a method for preparing mesophase pitch-based carbon fibers using coal tar pitch, comprising: 1) using medium- and low-temperature coal tar pitch as raw material under a nitrogen atmosphere, alternating polycondensation reactions and hydrogenation reactions to obtain mesophase pitch; 2) purifying the mesophase pitch using pyridine insolubles to obtain spinnable mesophase pitch; 3) dissolving polyacrylonitrile, a composite additive, and the spinnable mesophase pitch in a dimethyl sulfoxide solvent to obtain a spinnable sol; 4) sequentially subjecting the spinnable sol to melt spinning, pre-oxidation, carbonization, and graphitization to obtain mesophase pitch-based carbon fibers. The present invention synthesizes the mesophase pitch through a hydrogenation polycondensation process; then dissolves it with polyacrylonitrile and a composite additive in dimethyl sulfoxide to form a sol; and then sequentially melt spinning, pre-oxidation, carbonization, and graphitization to obtain mesophase pitch-based carbon fibers with a denser cross section, excellent mechanical properties, and high electrical conductivity.

The present invention relates to a process for needle coke production by co-processing coal tar pitch (CTP) with petroleum streams. The process utilizes a ‘multi-residence time mild thermal cracking’ of coal tar pitch with petroleum streams (CLO, PFO) followed by solvent-assisted selective separation of undesirable quinoline insoluble (QI) and solid catalyst fines from the mixed pitch and delayed coking thereafter to produce needle coke. The solvent employed for feedstock purification is a mixture prepared from an aromatic solvent which is a lighter fraction formed by mild and severe thermal cracking of mixed feedstock, an aliphatic solvent and a polar extraction solvent.

The invention belongs to the technical field of capacitor carbon preparation, and particularly relates to hollow spherical capacitor carbon based on coal pitch and a preparation method and application thereof. The hollow spherical capacitance carbon is prepared by taking coal pitch as a raw material, and the limitation of a traditional carbon source is broken through; and dispersing agent assistance, thermal annealing, high-temperature carbonization, activating treatment and other processes are adopted, so that the specific surface area, the microporosity and the capacitive performance of the capacitive carbon are improved.

The present application belongs to the technical field of petroleum processing and the field of carbon material preparation, and discloses a preparation method of spinnable mesophase pitch based on co-carbonization of coal tar pitch and catalytic cracking slurry. Coal tar pitch and xylene-soluble components of coal tar pitch extracted by xylene are mixed with catalytic cracking slurry, and then co-carbonization reaction is carried out. The reaction product is crushed, secondarily extracted, filtered, and then subjected to low-temperature heat treatment to obtain spinnable mesophase pitch. Through raw material cooperation and multi-stage purification process, the present application realizes high content, high spinnability and structure controllability of mesophase pitch, and the process is simple, environmentally friendly and economical, and is suitable for large-scale production of high-performance pitch-based carbon fiber.

The invention relates to the technical field of energy storage, in particular to a boron-doped porous composite carbon nanosheet as well as a preparation method and application of the boron-doped porous composite carbon nanosheet. Rape seed cakes and coal pitch are used as carbon sources, boric acid is used as a boron source, and zinc acetate is used as a template and catalyst; the preparation method comprises the following steps: uniformly mixing rape seed cakes, coal pitch, boric acid and zinc acetate, putting the mixture into a carbonization furnace, and heating in an argon atmosphere to prepare the boron-doped porous composite carbon nanosheet. The specific surface area of the porous composite carbon nanosheet is between 288 and 544 m < 2 > / g; the total pore volume ranges from 0.37 cm < 3 > / g to 0.54 cm < 3 > / g; as a negative electrode material of a potassium ion battery, in a 1.0 M potassium bis (fluorosulfonyl) imide (KFSI) electrolyte, when the current density is 0.1 C, the specific capacity can reach 308.9 mAh / g; and when the current density is 5C, the capacity is kept at 114.5 mAh / g after circulation is carried out for 1 to 200 times. When the current density is increased to 20C, the specific capacity can reach 95.4 mAh / g, and high capacity and good rate capability are shown.

The present invention relates to the technical field of anode materials for sodium-ion batteries, and discloses a method for preparing hard carbon by in-situ doping and pre-oxidizing heavy organic matter, which includes the following steps: Step 1, low-temperature oxidation: After heat treatment, a pre-oxidized carbon material is obtained; Step 2, element doping: A hard carbon precursor doped with sulfur elements is obtained; Step 3, low-temperature curing: A cured hard carbon precursor of pre-oxidized heavy organic matter doped with sulfur elements is obtained; Step 4, high-temperature carbonization: A hard carbon precursor material of pre-oxidized heavy organic matter doped with sulfur elements with a stable structure is obtained; In the present invention, medium-temperature coal tar pitch is first low-temperature oxidized to obtain a pre-oxidized carbon material, and then the sulfur element-doped material and medium-temperature coal tar pitch are reacted at low temperature, so that the hydrogen ions in the medium-temperature coal tar pitch are replaced by sulfur to form relatively stable chemical bonds. The continuity of the chemical bonds is beneficial to enhancing the stability of the structure. The doping of sulfur atoms not only provides active sites to increase the sodium storage capacity, but also expands the interlayer spacing to improve the rate performance.

This invention relates to the field of electrochemical energy storage battery technology, specifically to a method for preparing a controllable pitch-based anode material, a hard carbon anode material, and a sodium-ion battery. The preparation method includes: S1. Pre-oxidation treatment: pre-oxidizing the raw materials to obtain an oxidized precursor with an oxygen content of 15%~35%; the raw materials are selected from at least one of pitch, biomass, and phenolic resin; S2. Precursor compositing: mixing the oxidized precursor with a thermoplastic precursor at a mass ratio of 1~5:1 to obtain a composite precursor; the thermoplastic precursor is selected from at least one of petroleum pitch, coal tar pitch, phenolic resin, and aqueous phenolic resin; S3. Carbonization treatment: carbonizing the composite precursor under an inert atmosphere to obtain the pitch-based electrode material. The prepared carbon material has the advantages of uniform structure, stable interface, high reversible capacity, and high initial coulombic efficiency, and the preparation process is simple with controllable product quality.

The method comprises the following steps: distilling coal tar pitch at 300-350 DEG C for 10 minutes, carrying out vacuum drying on the distilled pitch at 120-150 DEG C, adding a modified boron nitride agent accounting for 10-15% of the total amount of a base material and an additive accounting for 8-12% of the total amount of the base material into the base material, uniformly mixing, and finally carrying out heat treatment for 1 hour, so as to obtain the modified asphalt with high carbon yield for the prebaked anode. And drying. In the modification of the high-carbon-yield asphalt, the coal tar asphalt is subjected to distillation, heat treatment, blending of a modified boron nitride agent and an additive, and heat improvement and optimization, so that the prepared asphalt is modified into a pre-baked anode product which is excellent in strength performance, electrical conductivity and high-temperature-resistant stability; the performance of the product can be improved in a coordinated manner.

The utility model relates to coal chemical industry technical field discloses a kind of recovery smelting device for coal pitch, including mounting bracket;Mounting plate, the mounting plate is fixedly connected in the upper portion of the mounting bracket;Smelting pot and discharge port, the smelting pot is fixedly connected in the middle portion of the mounting plate, and the discharge port is fixedly connected in the bottom of the smelting pot;Motor, the motor is arranged in the top of the smelting pot;Rotating rod, the rotating rod top is fixedly connected in the output end of the motor, and the rotating rod bottom is rotatably connected in the inside of the smelting pot and the discharge port;Connecting block and mounting rod, the connecting block is fixedly connected in the outside both sides of the rotating rod.The utility model in, when discharging, avoid the problem that liquid coal pitch is solidified if in the vicinity of discharge port, causes passageway blockage, to improve the discharging efficiency by auger blade rotation in the inside of discharge port.

The application discloses a catalyst preparation method for producing rubber oil from medium-low temperature coal tar pitch, and comprises the following steps: 1, adding active metal precursor, alumina precursor, molecular sieve and agate ball into a ball mill jar according to a stoichiometric ratio, and ball milling for 1 hour to obtain a viscous mixture; 2, drying the viscous mixture obtained in the step 1 in an oven at 110 DEG C for 6 hours, and then calcining at 550 DEG C for 4 hours to obtain an oxidized catalyst; 3, immersing the oxidized catalyst obtained in the step 2 in a sulfuration agent for 12 hours, and then drying at 90 DEG C for 3 hours to obtain a presulfurized product; and activating the presulfurized product obtained in the step 3 in an autoclave to obtain the catalyst for producing rubber oil from medium-low temperature coal tar pitch. According to the method, the carrier compounding and active metal loading are completed through one-time feeding, and no pre-sulfur waste liquid is generated. The catalyst has high activity, controllable pore and adjustable acidity, and has a good application prospect in the hydrogenation of medium-low temperature coal pitch.

This invention discloses a catalytically assisted graphitization method for graphite materials used in lithium-ion battery anodes, belonging to the field of lithium-ion battery technology. Spherical mesophase carbon microspheres are mixed with ferric nitrate nonahydrate and ammonium molybdate in liquid phase and then spray-dried to obtain composite microsphere powder loaded with an iron-molybdenum catalyst precursor. This powder is then heated and mixed with medium-temperature coal tar pitch and cold isostatically pressed to obtain a composite green body. After gradient carbonization treatment, an isotropic stress field is established within the body using the shrinkage of the pitch carbonization. High-temperature catalytic graphitization is then performed at 2600℃-2800℃, causing the iron-molybdenum to form a eutectic catalytic system. This system, in conjunction with the stress field, induces carbon atom rearrangement, forming a highly crystalline graphite structure with a high degree of surface graphitization and an isotropic interwoven internal structure. Finally, the graphite is obtained through dissociation, pulverization, and classification. This invention achieves a balance between high capacity and high rate performance of the anode material through the synergistic effect of catalysis and the stress field.

A method for preparing coal tar pitch-based hard carbon anode material belongs to the field of anode materials. This method uses coal tar pitch as a raw material, leveraging its advantages of wide availability and high carbon content (rich in aromatic compounds). A precursor is obtained by adding a crosslinking agent and a modifier, followed by high-temperature sintering to obtain hard carbon. This invention improves the interlayer spacing of the material through the modifier, resulting in hard carbon with high specific capacity and initial coulombic efficiency, with an initial discharge specific capacity exceeding 300 mA hg. ‑1 .

The application discloses a method for preparing mesophase pitch by hydrogenating coal tar pitch components, which comprises the following steps: obtaining three components A, B and C or four components A, B, C and D or five components A, B, C, D and E from coal tar pitch by using a step-by-step extraction method; adding a hydrogen-donating solvent and a catalyst into heavy components separated from the coal tar pitch, and performing hydrogenation treatment to obtain hydrogenated heavy components; mixing the hydrogenated heavy components and unhydrogenated components according to a certain proportion to obtain modified pitch; and performing thermal polycondensation reaction on the modified pitch to obtain mesophase pitch. The modified pitch has a suitable molecular composition for preparing mesophase pitch, the molecular weight range is reasonable and the distribution is concentrated, the prepared mesophase pitch has high anisotropy content and good optical structure, and is rich in wide-range flow line structure, so that the mesophase pitch is a high-quality precursor for preparing carbon fiber and needle coke and other carbon materials.

The invention belongs to the technical field of coal pitch carbon fibers, and discloses a hollow coal pitch carbon fiber and a preparation method thereof. Comprising the steps of coal-based pitch preparation, melt spinning, pre-oxidation, carbonization and graphitization. According to a specific spinning process, the coal-based pitch carbon fiber with high strength and a hollow structure can be prepared. The hollow coal-based pitch carbon fiber prepared by the method not only keeps higher mechanical properties, but also has high thermal conductivity, the cost is effectively saved, meanwhile, the comprehensive performance is remarkable, finally, the yield of the coal-based pitch carbon fiber can be improved, and the coal-based pitch carbon fiber has wide application prospects.

The invention belongs to the technical field of coal chemical industry, and particularly relates to a production method and a production system of low-sulfur low-nitrogen coal tar pitch based on ozone oxidation. The method comprises the following steps: mixing coal tar pitch with a solvent to obtain mixed oil, heating the mixed oil to 80-120 DEG C, adding a supported iron-based metal oxide catalyst, carrying out an ozone reaction, extracting, and evaporating to obtain the low-sulfur low-nitrogen coal tar pitch. Compared with the prior art, the low-sulfur low-nitrogen coal tar pitch prepared by the method has the advantages that the sulfur content is lower, the effect is improved remarkably, less ozone is used in the reaction process, the oxidation reaction temperature is lower, and the method has positive significance in saving raw materials and reducing energy consumption. The production system disclosed by the invention comprises the dissolution reaction kettle, the oxidation tower, the extraction tower group and the evaporation tower, and by adopting the system, the desulfurization reaction is more sufficient, so that the desulfurization efficiency is improved, meanwhile, a solvent is recycled, raw materials are saved, and the cost is reduced.

The invention discloses a silicon-carbon-based high-temperature electric heating energy storage material as well as a preparation method and application thereof, and belongs to the technical field of high-temperature heat storage materials. The silicon-carbon-based high-temperature electric heating energy storage material provided by the invention is prepared from the following raw materials: silicon carbide powder, a binder and silicon powder, the binder comprises at least one of coal pitch, petroleum pitch, phenolic resin and epoxy resin. The silicon-carbon-based high-temperature electric heating energy storage material provided by the invention overcomes the problems of difficult heat transfer and poor high-temperature conductivity stability of a heat storage material in the prior art, the material directly utilizes the Joule heating effect to realize spontaneous heating, and a traditional electric heating wire structure is omitted; and the comprehensive advantages of high efficiency, long service life and high safety of the material in high-temperature electric heating energy storage application are ensured.

The invention relates to the technical field of prebaked anodes, in particular to an anti-oxidation corrosion-resistant prebaked anode and a preparation method thereof. The oxidation-resistant corrosion-resistant prebaked anode comprises the following raw materials: calcined petroleum coke, coal pitch, crushed materials and an additive, and the mass ratio of the calcined petroleum coke to the coal pitch to the crushed materials to the additive is 100: (14.2-15.2): (5-15): (1-5); the calcined petroleum coke comprises a coarse coke material with the particle size of 5-10 mm, a medium coke material with the particle size of 1-5 mm and a fine coke material with the particle size of 0.1-1 mm; the mass percent of the coarse coke material in the calcined petroleum coke is 30-40%, the mass percent of the medium coke material in the calcined petroleum coke is 30-40%, and the balance is the fine coke material. The compactness and the oxidation resistance of the prebaked anode are effectively improved, the air permeability is reduced, and collaborative optimization and improvement of the conductivity and the compactness are achieved.

This invention discloses a prefabricated substation combined foundation and its construction method, belonging to the technical field of prefabricated substation combined foundation construction. The combined foundation includes multiple precast pipe piles and a precast platform. The lower ends of the precast pipe piles are embedded in the foundation, while the upper ends protrude above the ground. The bottom surface of the precast platform is fixedly connected to the tops of all the precast pipe piles. The precast platform includes a load-bearing frame and a panel laid on the frame. During construction, the pile position deviation is first measured and controlled by setting out lines. Then, the piles are driven, and the verticality of the pile body is orthogonally checked using a double theodolite. Next, the precast platform is hoisted and aligned. Finally, it is welded and fixed, and multi-layer composite anti-corrosion treatment is applied. This invention adopts a fully prefabricated dry construction method, eliminating the need for cast-in-place concrete and curing. The construction cycle for a single foundation is shortened from the traditional 35 days to 2 days. Through designs such as a weld height ≥8mm and an epoxy coal tar pitch and fiberglass cloth composite anti-corrosion layer, the connection strength and durability are guaranteed.

This invention belongs to the field of chemical technology, specifically relating to a method for preparing an impregnating agent for graphite, comprising the following steps: (1) mixing an aromatic hydrocarbon polymer with an organic solvent, and then mixing it with medium-temperature coal tar pitch to obtain liquid-phase pre-prepared pitch; the aromatic hydrocarbon polymer is the remaining product after evaporation and purification of 2-hydroxy-5-nonylbenzaldehyde and 2-hydroxy-5-nonylphenylacetone at 120-160℃; (2) allowing the mixture to settle and separate into layers, and taking the upper extract to obtain refined pitch containing solvent; (3) obtaining refined pitch after separating the organic solvent; (4) obtaining mesophase microspheres through thermal polymerization; (5) removing the remaining light components in the mesophase microspheres to obtain the impregnating agent for graphite. This invention finds that by using an aromatic hydrocarbon condensate polymer without quinoline insolubles as one of the raw materials, the quinoline insoluble content of the product is reduced without reducing the functional performance of the impregnating agent, the softening point is moderate, and the production cost is effectively reduced.

The invention provides an anode carbon block soaked with carbon. An adhesive for the anode carbon block soaked with the carbon comprises the following raw material components in parts by weight: 50-55 parts of coal pitch, 25-30 parts of borax, 10-15 parts of kaolin, 30-35 parts of industrial phosphoric acid, 40-45 parts of carbon tetrachloride and 50-55 parts of water. The preparation method of the soaked carbon anode carbon block comprises the following steps: measuring the surface temperature of an anode cooked block by using an infrared temperature measuring gun, slowly putting the anode cooked block into a soaking pool, keeping for 30-60 seconds, keeping for 25-35 seconds in the air, and then putting the anode cooked block into a drying oven for drying, thereby obtaining the soaked carbon anode carbon block. The service life of the anode carbon block obtained through the preparation method of the soaked carbon anode carbon block is prolonged, the pole changing period of the anode carbon block is increased to 36 days or above from 34 days, the anode carbon consumption is reduced, and the electrolytic bath process is stabilized.

The invention relates to the technical field of carbon material preparation, and discloses a preparation method of a high-purity high-temperature-resistant graphite material for a photovoltaic thermal field, the high-purity high-temperature-resistant graphite material is prepared from pitch coke, artificial graphite fine powder and a high-wettability modified binder, and the binder comprises coal pitch, heavy anthracene oil and a surfactant. The preparation method comprises the following steps: micronizing aggregate, mixing and kneading the micronized aggregate and a modified binder at a high temperature, and carrying out secondary grinding to obtain pressed powder with preset grain size distribution; cold isostatic pressing forming is adopted, and the pressure relief time is strictly controlled; the green body is subjected to low-speed heating roasting, dipping densification and high-temperature graphitization treatment, and halogen gas is introduced into a graphitization high-temperature section for chemical purification. According to the invention, a composite aggregate system and a secondary granulation process are matched with a stress release regulation means for a large-size product, so that the technical problems that the large-size graphite product is easy to crack and low in density are solved, and the volume density, mechanical strength, purity and thermal shock resistance of the material are improved.

The present application provides a kind of coal-based mesophase pitch and its preparation method, belong to pitch preparation technical field.The preparation method includes the following steps: coal-based raw pitch is pretreated, and refined coal pitch is obtained;Distillation is carried out on refined coal pitch, and distillation coal pitch is obtained;Heat polycondensation reaction is carried out on distillation coal pitch, and coal-based mesophase pitch is obtained.The present application uses single coal-based raw pitch as raw material, with the help of the combination of pure physical purification of refining-distillation, cooperatively removes impurities and controls material composition, reduces the quinoline insoluble content of coal pitch to below 0.1wt%.On this basis, through non-catalytic heat polycondensation reaction, the mesophase conversion rate is significantly improved, and the performance consistency of the obtained product as carbon material precursor is improved.The process is simple, controllable, energy-saving and cost-effective, which provides a reliable technical path for the high-value utilization of coal tar pitch and the large-scale stable production of high-end carbon materials.