509 results about "Petroleum coke" patented technology

The invention relates to the technical field of chemical raw material processing, and discloses a petroleum coke particle size grading and batching system which comprises a raw material pretreatment module, a multi-stage dynamic screening module, a particle size real-time monitoring module, an intelligent batching decision module and a closed-loop control execution module. The classification definiteness of materials with different particle sizes is ensured; meanwhile, through a particle size monitoring feedback mechanism, the particle size distribution abnormal state in the screening process is recognized in real time, the material purity within the target particle size range is guaranteed, the particle size grading accuracy is improved, a closed-loop matching decision module is arranged, particle matching weight parameters are dynamically optimized in combination with the electrolytic aluminum process requirement, and the particle size grading accuracy is improved. The deviation degree between the ingredient proportion and the target performance can be judged in real time; the speed ratio of the conveying belt and the opening degree of the stock bin are automatically corrected through the executing mechanism, it is guaranteed that the mixing proportion of coarse particles, medium particles and fine particles is always in the optimal interval matched with electrolytic aluminum anode production, and the quality stability of anode carbon blocks is improved.

The invention discloses a yellow phosphorus furnace electrode paste and a preparation method thereof, and belongs to the technical field of yellow phosphorus furnace production, the yellow phosphorus furnace electrode paste comprises the following raw materials by mass: 55-65% of anthracite particles, 20-25% of petroleum coke, 5-10% of graphite chips, 18-25% of a composite binder, 0.3-1.5% of a composite antioxidant and 1.5-4.5% of an additive; the yellow phosphorus furnace electrode paste provided by the invention is produced according to the preparation method provided by the invention, and the resistivity, compressive strength and oxidation resistance can be synchronously improved through the design of carbon material multistage particle size distribution, a nano-reinforced composite binder and a synergistic anti-oxidation system in combination with an efficient drying and densification process; the problem that an existing electrode paste is poor in density and performance is effectively solved.

A method for producing hydrocarbon fluids via a hydrocarbon well comprises providing petroleum coke proppant particles having an Amott index for oil of at least 0.02, an Amott index for water of at most 0.1, and a pseudo Amott index of at most 0.35. The method also comprises, for each of a number of stages of the hydrocarbon well, introducing a fracturing fluid comprising a carrier fluid and the petroleum coke proppant particles into a subterranean formation via a wellbore of the hydrocarbon well and then producing hydrocarbon fluids from the subterranean formation via the wellbore of the hydrocarbon well.

A fracturing fluid comprises a carrier fluid and coke particles. The coke particles include microproppant coke particles (e.g., petroleum coke fines) having particle sizes of at most 105 μm, where the microproppant coke particles have a total concentration of at least 3 wt % based on the total weight of the coke particles. The coke particles also have a total concentration in the fracturing fluid from 14 kilograms per cubic meter to 480 kilograms per cubic meter, based on the volume of the carrier fluid. A method includes introducing such fracturing fluid into a subterranean formation.

The invention relates to the technical field of industrial wastewater treatment, and discloses an efficient two-stage reverse osmosis petroleum coke water treatment system, which comprises pretreatment execution ends, a reverse osmosis core end, a concentration regeneration end and an intelligent control end which are commonly configured with a data feedback module. A step-by-step mechanism is established at the initial stage of wastewater treatment, quartz sand is adopted to intercept large-particle suspended solids, activated carbon is adopted to adsorb and degrade organic matters, softening resin is adopted to replace and remove scaling ions, ozone is adopted to catalyze, oxidize and decompose refractory pollutants, an oxidation-reduction potential dynamic regulation and control mechanism is innovatively introduced, and the dosage of an oxidizing agent is automatically regulated according to water quality and chemical quality; by means of the design, the blocking problem caused by high-hardness waste water is solved, the membrane is prolonged, the solution period is stably solved, the chemical cleaning frequency and agent consumption are reduced, a pollution early warning and closed response linkage mechanism is constructed, membrane damage caused by manual intervention delay is avoided, and the service life of membrane elements is prolonged and reduced.

The invention provides a high-performance S < iC > composite material and a preparation method thereof, and the high-performance S < iC > composite material is prepared from the following components in parts by mass: 20-35 parts of industrial grade alpha-SiC powder, 10-14 parts of petroleum coke powder, 4-9 parts of short carbon fiber, 2-6 parts of T < iC > powder, 1-4 parts of sintering aid, 2-7 parts of PMMA microspheres, 4-11 parts of NaCl particles and 1-3 parts of polyvinyl alcohol. In the preparation process of the SiC composite material, full-chain innovation of one-step sintering and low-temperature precise post-treatment is adopted, perfect combination of low cost, high performance, high stability and green manufacturing is achieved, and the long-term bottlenecks of a traditional S-C composite material in the aspects of cost, performance, processing defects and the like are solved.

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The invention provides a petroleum coke drying and calcining system, which belongs to the technical field of tar treatment and comprises a feeding bin, a waste heat rotary drying furnace, a calcining furnace, a slag cooler, a receiving bin and a tail gas incineration chamber connected with the calcining furnace. The green petroleum coke raw material is fed into a waste heat rotary drying furnace to be dried; a drying furnace water vapor outlet, a drying furnace smoke outlet and a drying furnace waste heat tail gas inlet are formed in the waste heat rotary drying furnace; high-temperature tail gas generated by calcining and volatilizing materials in the calcining furnace enters the tail gas incineration chamber through the calcining furnace tail gas volatilization opening, and high-temperature tail gas generated by mixed combustion of the high-temperature tail gas and fuel gas entering the tail gas incineration chamber enters the calcining furnace and reversely flows with the materials in the calcining furnace to calcine the materials in the calcining furnace, so that primary utilization of the tail gas is realized. The high-temperature tail gas is calcined to absorb heat to form low-temperature tail gas, and the low-temperature tail gas enters the waste heat rotary drying furnace to dry materials, so that secondary utilization of the tail gas is realized, and the problems of low integration degree, high production cost and low treatment efficiency are solved.

Proppant particulates like sand are commonly used in hydraulic fracturing operations to maintain one or more fractures in an opened state following the release of hydraulic pressure. Fracturing fluids and methods of hydraulic fracturing may also use proppant particulates composed of petroleum coke material. Such proppant particulates may have improved transport into fractures because of lower density than traditional proppants like sand and may produce fewer fines that reduce fluid flow through proppant packs. The proppant particulates of the present disclosure are composed of thermally post-treated delayed coke and exhibit mechanical properties comparable to fluid coke and flexicoke petroleum coke materials for use as proppant particulates.

The invention relates to the technical field of dust suppression, and discloses petroleum coke blending dust suppression and recovery equipment which comprises a machine shell and a plurality of pulse guns, a partition plate is fixedly arranged in the machine shell, and an inner cavity of the machine shell is divided into a dust collection cavity and a clean cavity by the partition plate; the driving piece is used for controlling the turning plate to close the square groove in the pulse dust cleaning stage, so that dust falling from the outer wall of the filter cartridge is guided to the dust collection cavity along the inclined plate; and the turning plate is controlled to open the square groove in a non-deashing filtering stage, so that dust-containing gas enters the external space of the filter cartridge through the square groove. An inclined plate is arranged below each layer of filter cartridge, and a turning plate controlled by a driving piece is arranged on each inclined plate. The equipment opens the turning plate in the filtering stage to enable airflow to pass through, and closes the turning plate below the ash removal layer in the pulse ash removal stage to form physical isolation. And dust falling from upper-layer dust removal is thoroughly prevented from falling onto the surface of the lower-layer filter cartridge. The service life of the filter cartridge is obviously prolonged and the maintenance frequency and energy consumption are reduced.

The invention discloses a preparation method of high-rate fast-charging graphite from a semi-calcined coke raw material, and belongs to the technical field of batteries, and the preparation method comprises the following steps: S1, crushing and shaping the semi-calcined coke raw material; s2, carrying out graphitization high-temperature treatment on the crushed and shaped semi-calcined coke; s3, mixing and coating the semi-calcined coke subjected to graphitization high-temperature treatment with a coating agent; s4, performing high-temperature carbonization heat treatment on the semi-calcined coke mixed and coated with the coating agent; s5, screening the petroleum coke semi-calcined coke subjected to high-temperature carbonization heat treatment to obtain a semi-calcined coke raw material high-rate fast-charging graphite; the material has the advantages of large discharge capacity, good cycle performance, good electrochemical performance, high discharge plateau and plateau retention rate, good large-current charge-discharge performance, good safety, good adaptability to electrolyte and other additives, stable product properties, almost no difference between batches, simple and feasible preparation method, and suitableness for industrial production.

When potassium hydroxide (KOH) or other activating agents are used to activate carbon, the hydrochloric acid used to remove it may damage the stainless steel equipment used in the process. Herein, water and citric acid are used to wash the carbon after its activation to reduce damage to the equipment. Prior to activation, a slurry of coal, petroleum coke or other carbonaceous material mixed with water and KOH is dried in layers. During drying, the KOH repeatedly precipitates as a crust on the layers and is repeatedly blended back into the mixture. Activation temperature and duration may be selected to control the pore size distribution in the activated carbon.

The utility model discloses a screening device for calcined petroleum coke, which belongs to the technical field of calcined petroleum coke and comprises a screening box, two partition plates are arranged in the screening box, three groups of screening net cylinders are arranged in the screening box, and the diameters of screening holes of the three groups of screening net cylinders are sequentially increased. A dust cleaning and collecting mechanism is arranged at the top of the screening box, and a constant-speed feeding mechanism is arranged in the middle of the screening box. In the process, the dust cleaning and collecting mechanism is arranged, and in the process, a negative pressure state is formed in a collecting tank through a negative pressure fan; and at the moment, dust in the screening box is adsorbed and collected into the collecting tank through the cleaning pipe and the vertical pipe, so that the dust generated in the screening process of the petroleum coke can be collected and treated, air pollution caused by dust floating is avoided, meanwhile, the collected dust can be recycled, and the screening effect on the petroleum coke is improved.

The invention relates to a semiconductor device manufacturing technology, and aims to provide a preparation method of refined coke powder and high-purity isostatic pressing graphite. The method comprises the following steps: by taking calcined petroleum coke or calcined pitch coke as a raw material, crushing and grinding to obtain primary coke powder, then carrying out high-temperature halogen impurity removal treatment in a continuous heating manner, and introducing Freon gas in the process; cooling to obtain impurity-removed coke powder; and carrying out dispersion, grinding, shaping treatment, airflow classification and magnetic separation to obtain refined coke powder. According to the method, the impurity content is greatly reduced from the raw material end, the situation that a large number of metal impurities generated during smashing and grinding treatment cannot be eliminated in the graphitization process due to the fact that the metal impurities are located below the surface layer of a blank can be avoided, and the internal impurity content of a final graphite product is smaller than 20 ppm; higher tap density can be obtained, and a better mixing and kneading effect is realized; the porosity of an isostatic pressing graphite product can be reduced, the microstructure of a graphite material is effectively improved, and the corrosion resistance of the graphite material is effectively improved.

The invention provides a prebaked anode with high compressive strength. The prebaked anode comprises the following raw materials: 68-85 parts by mass of calcined petroleum coke particles; 12-25 parts by mass of a modified coal pitch binder, wherein the softening point of the modified coal pitch binder is 105-115 DEG C; and 0.3-0.8 part by mass of a whisker reinforcing agent. The production process comprises the following steps: calcining, crushing and grading, modifying fine powder, preparing a binder, mixing and kneading, forming and roasting. The prebaked anode has the advantages that through multi-stage material collaboration and process innovation, under the condition that an existing production line is not changed at all, the core contradictions that the prebaked anode is insufficient in strength, poor in conductivity and poor in high-temperature stability are synchronously solved.

The invention relates to the technical field of submerged arc furnaces, in particular to a preparation method of a bottom electrode of a direct-current submerged arc furnace and the direct-current submerged arc furnace. The preparation method of the bottom electrode of the direct-current submerged arc furnace comprises the steps that petroleum coke and pitch coke are evenly mixed and then smashed into the three-level particle size, a binder is added, bidirectional compression molding is conducted at the preset temperature, and the bottom electrode of the direct-current submerged arc furnace is obtained; meanwhile, mechanical vibration with the preset frequency is applied, the pressure gradient is gradually increased, pressure maintaining is conducted for the first duration, and a formed blank is obtained; carrying out gradient roasting on the molded green body and carrying out heat preservation for a second time to obtain a graphitized electrode green body; and immersing the graphitized electrode blank into the modified asphalt of the dipping tank, carrying out vacuum pressurization and pressure maintaining, and then directly transferring the electrode blank to the bottom of the direct current submerged arc furnace for secondary roasting to obtain the bottom electrode of the direct current submerged arc furnace. The heat control and anti-scouring performance of the bottom electrode of the direct-current submerged arc furnace is optimized.

The invention discloses a method for preparing high-strength aluminum alloy through regeneration of waste 7-series aluminum alloy and application of the method, and belongs to the technical field of aluminum alloy recovery. The method comprises the following steps: (1) cleaning the waste 7-series aluminum alloy; (2) mechanically crushing to obtain waste chips with the thickness of less than or equal to 2mm and the width of less than or equal to 10mm; (3) the waste scraps, petroleum coke (2-4 wt.%) with the average particle size smaller than 50 nm and metal elementary substance powder are mixed and subjected to ball milling, the Zn content ranges from 5.2% to 11.8%, and the Zn / Mg ratio ranges from 2.5 to 3.0; and (4) the composite material powder is extruded, forged and the like. Through the alloying control effect of the nano petroleum coke, regulation and control of oxidation layer breaking and strengthening phase precipitation are achieved, and the yield strength of the regenerated aluminum alloy reaches 934 MPa and the tensile strength reaches 987 MPa in combination with the dispersion strengthening and thermal mismatch effects. The method solves the problem of grade preservation and regeneration of the 7-series aluminum alloy waste, has the advantages of precise and controllable components, simple process, low cost and the like, and is suitable for manufacturing high-strength aluminum alloy parts in the fields of aerospace, rail transit and the like.

The invention belongs to the field of carbon product production, and particularly relates to special graphite for ion implantation and a preparation method thereof, and the special graphite is composed of aggregate coke, an additive and a binder; the aggregate coke comprises at least one of low-ash petroleum coke, pitch coke, pitch coke green coke, needle coke and artificial high-purity graphite, the ash content is not higher than 0.2%, the water content is not higher than 0.02%, and the prepared special graphite for ion implantation has excellent comprehensive performance indexes. The volume density is 1.85-1.92 g / cm < 3 >, the porosity is smaller than or equal to 7%, the resistivity is 12-14 mu omega m, the breaking strength is larger than or equal to 85 MPa, the compressive strength is larger than or equal to 180 MPa, the Young modulus is 13-15 GPa, the thermal expansion coefficient is smaller than or equal to 5.0 * 10 <-6 > / DEG C, the total impurity content is smaller than or equal to 50 ppm, the key metal element content is smaller than or equal to 5 ppm, and all the properties reach the industry leading level. The harsh requirements of the ion implantation technology on the special graphite material in the aspects of electric heating performance, mechanical performance, thermal stability and purity can be fully met, and stable operation and efficient work of ion implantation equipment are effectively guaranteed.

The invention provides an environment-friendly silicon wafer as well as a preparation method and application thereof, and belongs to the technical field of reactive sintering silicon carbide ceramics. The environment-friendly silicon wafer is prepared from the following raw materials in parts by mass: 100 parts of silicon powder, 5-10 parts of a binder, 8-15 parts of petroleum coke and water, and the binder is an environment-friendly binder and comprises one or more of corn starch, maltose, cane sugar and glucose. The environment-friendly adhesive is used for the silicon wafer, no unpleasant smell exists in the silicon wafer preparation and siliconizing sintering use process, the environment-friendly requirement can be met, and industrial production is facilitated; the use amount of the binder is limited, it can be guaranteed that in the sintering process of the reactive sintering silicon carbide ceramic, after a part of carbon content (solid content) is converted to be sintered, a blank still forms a round shape after silicon is dissolved out, the appearance is not deformed, and the problems that after the binder is sintered, the deformation is large, and the binder cannot be separated from the silicon carbide ceramic to be sintered are solved.

The utility model relates to the technical field of petroleum coke calcining furnaces, and discloses a petroleum coke calcining furnace with an ash removal mechanism, which comprises a furnace body, a hopper is rotatably arranged on the upper side of the furnace body, a rotating rod is arranged in the hopper, a material guide plate is slidably arranged outside the rotating rod through a sliding block, and the material guide plate is provided with an ash removal mechanism. A transverse rod is fixedly connected to the surface of the end, located on the lower side of the material guide plate, of the rotating rod, a swing rod is arranged at the end, away from the rotating rod, of the transverse rod, and through cooperation of the transverse rod, the sliding rod, the swing rod, the scraper and other structures, the scraper can synchronously conduct scraping and sweeping cleaning on the inner wall of the furnace body while rotary material distribution is conducted; complex driving and executing mechanisms such as an independent electric push rod and a circular ring plate do not need to be arranged, the overall structure of the furnace body is simplified, the manufacturing cost and the fault risk are reduced, continuous automatic operation of material distribution and cleaning at the same time is achieved, additional manual intervention on starting and stopping is not needed, and the intelligent level and the operation efficiency of equipment are remarkably improved.

The invention belongs to the technical field of petrochemical engineering, and relates to a continuous coking production system and process method for hydrogenated unconverted oil, and the production system comprises a membrane filter, a raw material tank, a homogenizer, a tubular furnace, a coking machine, an oil cooler and a stock bin. According to the invention, the continuous production of the high-quality petroleum coke is realized by combining a synergistic process method of membrane filtration, modification, homogeneous emulsification and tubular furnace coking machine coupling with a graphite adding and hydraulic conveying technology without a noble metal catalyst. The sulfur content, the ash content and the volatile components of the petroleum coke prepared by the technological method all meet the industrial standards, the requirement of pre-culture low-emission anode coke of electrolytic aluminum can be met, and the cost is low.

The invention relates to the technical field of graphite preparation processes, in particular to a preparation process of high-purity isostatic pressing graphite, which comprises the following steps: crushing calcined petroleum coke or pitch coke raw materials, carrying out primary grinding, carrying out dry mixing on the raw material powder obtained by the primary grinding, and then adding qualified modified pitch for wet mixing to prepare a paste material; performing secondary grinding to obtain paste powder, performing isostatic compaction, and performing pressure relief to obtain a green body; then the green body is placed in a roasting furnace to be vacuumized, nitrogen is introduced for heating and roasting, the temperature gradient of each temperature measuring point is obtained in the roasting process, the frequency domain characteristic difference between the different temperature measuring points in the roasting furnace is calculated, the temperature gradient difference is obtained, then the heating rate in the roasting process is controlled and adjusted, and a roasted product is obtained. And graphitizing and purifying the roasted product to prepare the high-purity isostatic pressing graphite. The preparation method can improve the preparation quality of the isostatic pressing graphite.

The invention belongs to the technical field of battery materials, and mainly relates to a method for preparing porous carbon microspheres through microwave induction of high-entropy alloy-petroleum coke and application. The method comprises the following steps: performing low-temperature plasma activation treatment on crushed and sieved petroleum coke powder to obtain activated petroleum coke powder; mixing and reacting the activated petroleum coke powder with a salt solution containing at least five transition metals, and performing freeze drying to obtain a high-entropy alloy-petroleum coke composite material precursor; the high-entropy alloy-petroleum coke composite material precursor is subjected to microwave radiation treatment in an inert atmosphere, and a carbonized precursor of a spherical structure is obtained; and performing high-temperature activation treatment on the carbonized precursor with the spherical structure in an activation atmosphere, and performing acid pickling and drying to obtain the porous carbon microsphere material. According to the method, the porous carbon microsphere material with high specific surface area, high microporosity and excellent conductivity is prepared through plasma activation, multi-metal complexation, microwave radiation and high-temperature activation treatment, and can be applied to a negative electrode material of a lithium ion battery.

The invention discloses a preparation method of a graphite material coated with hydroxyl-terminated phenyl silicone resin as a hard carbon source. The method comprises the following steps: S1, oxidizing petroleum coke single particles, and generating oxygen-containing functional groups on the surfaces to obtain modified petroleum coke single particles; s2, the modified petroleum coke single particles react with terminal hydroxyl groups in hydroxyl-terminated phenyl silicone resin, so that the surfaces of the petroleum coke single particles are coated with the silicone resin, and a coated precursor is obtained; and S3, under the catalytic action of silicon atoms in the silicon resin, carrying out a graphitization process on the coated precursor at a relatively low temperature to form a hard carbon coated graphite core-shell structure. The hard carbon coated graphite composite material obtained by the preparation method has good morphology and particle size distribution, and the button cell prepared from the hard carbon coated graphite composite material has excellent cycle performance and rate capability. In addition, under the condition that no catalyst is added, the temperature required by the graphitization process is reduced through the catalytic graphitization effect of silicon atoms in the hydroxyl-terminated phenyl silicone resin, and the purpose of reducing the production cost is achieved.

The utility model provides a discharging-controllable calcining furnace for petroleum coke calcination, and relates to the field of calcining furnaces, the discharging-controllable calcining furnace comprises a furnace body, the lower side surface of the furnace body is fixedly connected with a discharging pipe, the outer surface of the discharging pipe is fixedly sleeved with a transmission ring, the outer surface of the furnace body is fixedly connected with a fan, the outer surface of the transmission ring is fixedly connected with an integration pipe, and the integration pipe is fixedly connected with a discharging pipe. The outer surface of the integration pipe is fixedly connected with a conveying pipe, the conveying pipe is connected with a fan, the conveying pipe and the integration pipe are communicated with the interior of the conveying ring, the inner wall of the discharging pipe is fixedly connected with a dust removal ring, the inner wall of the dust removal ring is arranged to be an inclined plane, and dust removal holes are formed in the bottom wall of the dust removal ring. Flying dust can be absorbed and dedusted by means of the multiple sets of dedusting rings arranged in the discharging pipe when the flying dust is not separated from the discharging pipe, the situation that the flying dust drifts away after being separated from the discharging pipe is avoided, and the possibility that the flying dust harms the surrounding environment and the physical and psychological health of workers can be effectively reduced.

The invention belongs to the technical field of ecological grouting reinforcement materials and preparation, and provides an all-solid waste grouting reinforcement material and a preparation method thereof, and the all-solid waste grouting reinforcement material is prepared from fly ash, mineral powder, red mud, desulfurized petroleum coke ash, water and a water reducing agent. Distilled water is added into the dried, ground and screened red mud, and the soluble alkali in the red mud is calculated after full oscillation and drying. The effect of replacing an alkali activator is achieved by compounding with desulfurized petroleum coke ash. All the raw materials are mechanically stirred and molded to prepare the all-solid waste grouting reinforcement material. According to the invention, the desulfurized petroleum coke ash is neutralized by using the red mud, and the red mud is respectively used as a sodium-based exciting agent and a calcium-based exciting agent to replace an alkaline exciting agent, so that the cost is reduced, and the material shrinkage is reduced. The grouting reinforcement material is prepared from the solid waste, the problem of waste of solid waste resources is effectively solved, the problem that a cement-based grouting reinforcement material is low in early strength is solved, and the grouting reinforcement material has a wide application prospect in the field of low-carbon energy-saving tunnel and foundation engineering reinforcement.

The invention discloses a petroleum coke calcination waste heat stepped recovery rotary kiln system, which belongs to the technical field of rotary kilns, and comprises a kiln body, the kiln body is sequentially provided with a preheating zone and a calcination zone, and the kiln body between the calcination zone and a kiln head is provided with a cooling zone. The cooling zone comprises a first-stage cooling heat exchange section and a second-stage cooling heat exchange section which are sequentially arranged towards the kiln head, the first-stage cooling heat exchange section is used for preheating secondary air, the second-stage cooling heat exchange section is used for cooling calcined coke and recycling heat energy, an annular fin-shaped cooler is arranged on the inner wall of the kiln body of the second-stage cooling heat exchange section, and the annular fin-shaped cooler is used for cooling the calcined coke. A kiln head cover of the kiln body is provided with a rotary joint, and the annular fin-shaped cooler is connected with the outside-kiln heat exchange station through the rotary joint. The cooling zone is arranged in the cylinder of the rotary furnace, secondary air is preheated through the first-stage cooling heat exchange section, heat is recycled in the second-stage cooling heat exchange section through double media of heat conduction oil and demineralized water in a stepped mode, the overall heat recovery rate is obviously increased, and sensible heat waste and comprehensive energy consumption are obviously reduced.

The invention relates to the technical field of industrial detection, and discloses a high-precision petroleum coke moisture content analysis system, which comprises a petroleum coke multispectral characteristic processing module, a moisture analysis algorithm matching module and a moisture content execution module, petroleum coke is finely divided into three independent analysis levels of fine powder, medium particles and coarse particles according to particle sizes, detection weights are dynamically distributed based on mass proportions of all the particle sizes, when the proportion of the fine powder exceeds a critical threshold value, the system automatically improves the detection weights of the fine powder, the high water absorption characteristic of the fine powder caused by sharp increase of the specific surface area is captured, and the detection accuracy is improved. Aiming at the capillary moisture adsorption phenomenon caused by fine powder enrichment, the system generates a compensation coefficient positively correlated with the fine powder concentration in real time, the structural deviation caused by neglecting the particle size-moisture relevance in a traditional method is eliminated, the detection precision of a high-fine powder sample reaches a new height, a three-dimensional moisture distribution diagram is constructed through a distributed sensor network, and the detection precision of the high-fine powder sample is improved. The inherent defect that materials are regarded as a static homogeneous system in a traditional method is overcome.

The invention belongs to the technical field of lithium battery recovery, and particularly relates to a method for selectively recovering lithium from a positive electrode material of a waste lithium battery. The invention provides a method for selectively recovering lithium from a positive electrode material of a waste lithium battery. The method comprises the following steps: (1) mixing the positive electrode material obtained by pretreating the lithium battery with a large amount of carbon source, and then introducing nitrogen for roasting treatment; the bulk carbon source comprises at least one of pulverized coal, biomass-based solid waste, coke, petroleum coke or industrial waste carbon; (2) after the roasting treatment is finished, cooling to room temperature under the protection of nitrogen, and then grinding to obtain powder; (3) adding the powder into water for water leaching treatment, and filtering after water leaching treatment to obtain a lithium-containing aqueous solution and filter residues; and (4) carrying out evaporative crystallization treatment on the lithium-containing aqueous solution to obtain a Li2CO3 crystal product.

The invention discloses a method for preparing a porous carbon material by using petroleum coke and biomass as raw materials, which comprises the following steps: respectively crushing and drying a biomass raw material and a petroleum coke raw material, adding a dry biomass fine powder material and a dry petroleum coke fine powder material into urotropine, melamine, alcohol ether carboxylate and water according to a ratio, adding the materials into a reactor, stirring, mixing and reacting; the cured product is fed into a tubular furnace to be subjected to heat treatment in the nitrogen atmosphere, and a carbonized product is obtained; and activating the carbonized product in a carbon dioxide atmosphere to obtain the porous carbon material with the specific surface area of 1510-2090 m < 2 > / g, the total pore volume of 0.72-0.99 cm < 3 > / g and the average pore size of 1.71-2.29 nm. The raw material proportion, the mixing aid dosage and the carbonization activation condition can be adjusted according to different biomass types, the pore distribution of the product can be flexibly adjusted, and the method can be applied to different scenes. The method is low in cost, environment-friendly, controllable in product stability and suitable for large-scale production and application.