46results about How to "Low ash content" patented technology

The invention belongs to the field of biomedical materials, and particularly relates to a preparation method of collagen tripeptide and an obtained product. Compared with the prior art, the method has the advantages that by adding alkali to soak the cowhide particles and combining treatment means such as denaturation and enzymolysis, the destroy denaturation of a triple helix structure of collagen in the cowhide can be promoted, the collagen can be thoroughly subjected to enzymolysis, so that the yield of collagen tripeptide is higher, the molecular weight is small and concentrated, and meanwhile, the foreign flavor in the cowhide can be effectively removed; subsequently, mixed enzymes jointly act on collagen peptide bonds, so that generation of collagen tripeptide is facilitated; in the operation process of the method, acid or alkali does not need to be added for multiple times to adjust the pH, and the generated collagen tripeptide is low in ash content; after suction filtration and impurity removal, impurities in the collagen tripeptide are reduced, and the yield of the obtained collagen tripeptide freeze-dried product is high; under the synergistic effect of all the treatment processes, the prepared product is fine and smooth in component, free of fishy smell and foreign flavor and good in water solubility.

The invention relates to a method for preparing spinnable mesophase pitch and carbon fibers from coal tar fractions, and belongs to the technical field of carbon materials. The method comprises the following steps: distilling and extracting aromatic hydrocarbon fractions in different distillation ranges from coal tar, activating the aromatic hydrocarbon fractions in one or more distillation ranges as raw materials, and carrying out non-catalytic polymerization reaction on one or more activated coal tar fractions and one or more non-activated coal tar fractions at a low temperature, and performing high-temperature polymerization reaction to obtain matrix asphalt, and performing reduced pressure distillation treatment, solvent extraction or inert gas purging to obtain the spinnable mesophase asphalt. The spinnable mesophase pitch has wide-area streamline optical texture distribution, good directional arrangement and orderliness, the mesophase content can reach 100%, the softening point is low, the coking value is high, the ash content is low, and the structure is controllable. The carbon fiber prepared based on the mesophase pitch is short in required oxidation time and has excellent performance.

The invention relates to a preparation method of a biomass hard carbon negative electrode material and application of the biomass hard carbon negative electrode material in the field of energy storage. The method comprises the following steps: carrying out pretreatment, crushing and pre-carbonization treatment on a biomass raw material to obtain a pre-carbonized material; mixing and stirring the pre-carbonized material and an acid solution, washing and drying to obtain an acid-treated hard carbon material; soaking the obtained acid-treated hard carbon material in an alkaline solution, heating and stirring, washing and drying to obtain an alkali-treated hard carbon material; mixing the obtained alkali-treated hard carbon material with a pore-forming agent, carrying out ball milling, carrying out solid-liquid separation, and carrying out high-temperature carbonization and grinding on the obtained solid phase to obtain a powder sample; and mixing the obtained powder sample with hydrofluoric acid, and carrying out hydrothermal treatment to obtain the biomass hard carbon negative electrode material. The sodium ion battery prepared by taking the biomass hard carbon negative electrode material as a negative electrode material has the characteristics of high initial coulombic efficiency, high low-voltage platform specific capacity and excellent cycle performance and rate capability.

The invention provides a preparation process and application of rock sugar syrup, and belongs to the technical field of food production and processing. The purified high fructose corn syrup, purified mogroside and other high-purity components are used, the impurity content in the rock candy syrup raw materials is reduced, modified activated carbon is matched for adsorption treatment, the ash content of the rock candy syrup is reduced through the comprehensive effect, and meanwhile the light transmittance of the syrup is improved.

The invention belongs to the technical field of edible mushroom bran feed, and particularly relates to a method for reducing the ash content of pleurotus eryngii mushroom bran feed, which comprises the following steps: S1, preparing a mushroom bran fermentation base material; s2, activating the fermentation inoculant; s3, mixed fermentation: inoculating the activated fermentation inoculant into the mushroom bran fermentation base material, uniformly mixing, filling into a breathing fermentation bag, compacting, exhausting air in the bag, sealing, and fermenting at room temperature for 45 days to obtain the pleurotus eryngii mushroom bran fermentation feed. The pleurotus eryngii mushroom bran feed is fermented by adopting a mixed microbial agent of bacillus subtilis, candida utilis, lactobacillus plantarum and aspergillus niger, the change condition of the ash content ratio in the fermented pleurotus eryngii mushroom bran is studied, and it is found that the ash content in the pleurotus eryngii mushroom bran feed can be remarkably reduced; edible mushroom bran can be reasonably and fully utilized as an unconventional feed resource, and the method has important significance in solving the problem of feed shortage in the livestock and poultry breeding process, promoting healthy development of the breeding industry, saving resources and protecting the environment.

The invention provides a preparation process and application of sucrose syrup, and belongs to the technical field of food production and processing. According to the method, high-purity L-arabinose is used and matched with purified maltitol, the purity of the sucrose syrup raw material is improved, the influence of impurities is reduced, meanwhile, the modified nanofiltration membrane is selected to conduct impurity removal treatment on the syrup mixture, the ash content of the sucrose syrup is reduced through the comprehensive synergistic effect, and meanwhile the light transmittance of the syrup is improved.

The invention provides a biomass pyrolysis purification coupling reactor and a biomass pyrolysis method, and relates to the technical field of biomass pyrolysis gasification, the biomass pyrolysis purification coupling reactor comprises a fluidized bed reactor, a coupling purification separation assembly and a particle lifting conveying unit, the fluidized bed reactor comprises a reactor shell, a feed port and a gas distributor, the coupling purification and separation assembly comprises a cyclone separator, a built-in particle bed, a central exhaust pipe, a storage tank and a discharge structure, and the particle lifting and conveying unit is communicated with the dense-phase section and the storage tank. And the particle lifting and conveying unit is used for lifting and conveying pyrolysis products in the dense-phase section into the storage tank. The coke generated in the biomass pyrolysis process is used as the bed material of the built-in particle bed, so that not only is the recycling of solid-phase particles realized, but also the filtering and purifying capability and carrying heat of the particles are fully utilized.

The invention discloses a modified asphalt deliming processing technology, and belongs to the field of asphalt deliming. The invention relates to a modified asphalt deliming processing technology, which comprises: a, raw material preparation and pretreatment: selecting base asphalt meeting a quality standard as a main raw material, selecting a corresponding modifier such as a polymer, a rubber powder or a thermoplastic elastomer according to a modification requirement, mixing the base asphalt and the modifier according to a preset ratio, and carrying out pretreatment so as to obtain a modified asphalt mixture; comprising the following steps: removing impurities and moisture; according to the invention, through fine pretreatment (such as high-speed grinding and refining to below 50 [mu] m) of the raw materials and efficient stirring and constant temperature control in the melting reactor, it is ensured that asphalt and a modifier can be fully mixed and have a chemical reaction. Therefore, not only is the uniformity of the modified asphalt improved, but also the performance, such as durability and aging resistance, of the modified asphalt is remarkably improved. In addition, the stability and the service life of the modified asphalt are further enhanced by adding the antioxidant and the stabilizer.

The invention provides refined molasses as well as a preparation method and application thereof, and relates to the technical field of molasses refining. The preparation method of the sugar honey comprises the following steps: S1, dissolving cane molasses in water, and then adding a strain for fermentation to obtain fermented molasses; the strains comprise bacillus subtilis and saccharomyces cerevisiae; s2, adjusting the pH value of the fermented molasses to 8-9, standing, centrifuging, removing lower-layer precipitate, and retaining supernatant; s3, adjusting the pH value of the supernatant to 5.5-7, and performing ultrafiltration and concentration to obtain a concentrated solution; and S4, sterilizing and spray-drying the concentrated solution to obtain the refined molasses. The refined molasses prepared by the method is high in reducing sugar and crude protein content and low in salt and ash content.

The invention discloses an industrial salicylic acid refining and purifying method which comprises the following steps: S1, adding industrial salicylic acid into pure water, stirring and heating to 55-85 DEG C; s2, a reducing agent is added, and heat preservation and stirring are conducted for 20- And S3, cooling to 35-45 DEG C, filtering, centrifuging, and drying to obtain refined salicylic acid. According to the refining and purifying method provided by the invention, impurities such as water-soluble inorganic salts, colored substances and the like in the industrial salicylic acid are removed by using the pure water and the reducing agent, so that the product is refined and purified, and the refining and purifying method has the characteristics of remarkable effect, simple process, high practicability and the like, and is suitable for industrial production.

The utility model provides a device for generating coke breeze for blast furnace injection by pyrolyzing feed coal, which comprises a feeding unit, a pyrolyzing and separating unit, a heat carrier heating unit and a blast furnace injection separating unit which are sequentially connected, the pyrolysis and separation unit is divided into a pyrolysis reaction area and a gas-solid separation area, a solid outlet of the gas-solid separation area is connected with the heat carrier heating unit, an upper outlet of the heat carrier heating unit is connected with the blast furnace injection separation unit, and the blast furnace injection separation unit is used for extracting coke breeze for blast furnace injection. Through the arrangement of the washing and grinding device, the granularity of feed coal is controlled, the ash content in the feed coal is reduced, coke breeze is heated after pyrolytic reaction, the ash content of the coke breeze is reduced, and the granularity of the coke breeze is controlled through separation, so that the coke breeze can meet the use requirements of blast furnace injection materials, and the utilization value of low-rank coal and coke breeze products is improved; the device is simple in structure, easy and convenient to operate, low in cost, high in economic benefit and wide in application range.

The application belongs to the technical field of solid waste treatment, and particularly relates to an aluminum material smelting waste slag treatment device, which comprises a base, a treatment bin and a crushing bin installed on the base in sequence, two groups of crushing rollers rotating in opposite directions are installed in the crushing bin, and each crushing roller is provided with wave teeth; a primary filter screen is installed in the treatment bin through a mounting plate, and a scraping cleaning mechanism is installed on the treatment bin; an airflow stripping mechanism is installed in the treatment bin, and the airflow stripping mechanism comprises a Venturi tube installed below the primary filter screen, so that filtered impurity materials are sucked into the Venturi tube by negative pressure; the special-structure crushing rollers in the crushing bin and the two-stage and different-form separation structures installed in the treatment bin are matched, so that the mixed aluminum materials in the waste slag are not crushed together, the screening efficiency of aluminum sheets in the crushed waste slag is significantly improved, and the ash content on the aluminum sheets is effectively reduced.

The invention belongs to the technical field of quinoline insoluble extraction and utilization and carbon material preparation, and particularly relates to a quinoline insoluble extraction method, spherical capacitance carbon and a preparation method thereof. The extraction method of the quinoline insolubles comprises the following steps: mixing coal liquefaction residues, quinoline, an extraction agent and a dispersing agent to form a mixed solution containing the quinoline insolubles; and adding an auxiliary agent into the mixed solution, mixing, standing and filtering to obtain the quinoline insoluble substance and an asphalt solution. The extraction method of the quinoline insoluble substances has the beneficial effects that the quinoline insoluble substances are extracted from the coal liquefaction residues through mixed solvent extraction-sedimentation, the high-purity asphalt product is obtained, the purity of the asphalt product and the quinoline insoluble substances can be remarkably improved, the ash content in related products is effectively reduced, and the production cost is reduced. The preparation requirement of the carbon material is met; the spherical capacitor carbon has the advantages of high specific surface area, high mechanical strength, low porosity, high volume energy density and high capacitance performance.

The invention relates to the technical field of polypropylene, and particularly discloses a preparation method and application of polypropylene for an electrical membrane, and the preparation method comprises the following steps: carrying out polymerization reaction in a full-mixing Unipol gas phase fluidized reactor to prepare polypropylene powder; the method specifically comprises the following steps: in the presence of a Z-N catalyst, a cocatalyst and an external electron donor, adding propylene, and carrying out a polymerization reaction to obtain the polypropylene for the electrical membrane, according to the invention, a Unipol gas phase method polymerization process is used, a technology of directly polymerizing and producing the polypropylene for the electrical membrane in a reactor is adopted, key parameters of reaction are controlled, and the high-purity PP resin is directly produced in the gas phase method reactor so as to achieve the purpose that the product is free from washing, and the polypropylene for the electrical membrane with excellent performance is prepared.

The invention relates to the technical field of auxiliary chemicals, and discloses a coal flotation agent and a preparation method thereof. The specific method comprises the following steps: mixing the oily sludge, cyclohexanol, methyl amyl alcohol, lauryl sodium sulfate and water, and stirring to obtain a premix; and adding the chitosan composite microspheres into the premix, and continuously stirring to obtain the coal flotation agent. The method provided by the invention has a high removal rate on mineral substances in coal, reduces ash content generated by charcoal burning, and improves coal quality.

The application provides a plastic woven bag recycling and reusing processing device and processing technology, and relates to the technical field of plastic recycling and regeneration. The device comprises a first support frame and a second support frame. The first support frame is provided with a feeding plate, a discharging plate, an upper and lower feeding component, a first mounting plate and a conveying component. The second support frame is provided with a second mounting plate, a transfer component and a regeneration pretreatment component for plastic woven bag regeneration pretreatment. The application completes regular material conveying by means of an automatic feeding and discharging structure, realizes material station transfer by means of a transfer assembly, stably fixes the woven bag by means of an adjustable clamping structure, and then separates impurities on the surface of the material by means of a reciprocating movable multi-group rotating treatment structure. The application can automatically complete the whole process operation of feeding, transferring, pretreating and discharging. The application can meet the processing requirements of woven bags of different specifications, can prepare qualified raw materials meeting the regeneration and granulation standards, and effectively improves the resource recycling and regeneration utilization efficiency of waste plastic woven bags.

The invention relates to the technical field of mesophase pitch preparation, in particular to spinnable mesophase pitch for producing carbon fibers and a preparation method thereof.The spinnable mesophase pitch is obtained through the following steps that aromatic hydrocarbon-rich raw material oil and an extraction solvent are extracted according to the proportion, and then extracted oil and raffinate oil are obtained after standing sedimentation and separation; the preparation method comprises the following steps: filtering raffinate oil, carrying out atmospheric and vacuum distillation to obtain heavy raffinate oil, carrying out mild thermal cracking reaction on the heavy raffinate oil to obtain cracked raffinate oil, heating and distilling the raffinate oil to obtain refined raffinate oil, and finally mixing the refined raffinate oil and the cracked raffinate oil according to a ratio and carrying out thermal polycondensation reaction. According to the invention, the structure, composition and molecular weight distribution of the raw material oil are regulated and controlled by adjusting the ratio of the refined extract oil to the cracking raffinate oil, and the mesophase pitch with low softening point, high mesophase content, high H / C molar ratio and good spinnability is prepared.

The invention relates to a method for preparing a SiC-based porous material, in particular to a method for preparing a SiC-based porous material from balsa wood and lignite. The invention aims to solve the problems that the existing SiC-based porous material is high in preparation cost and difficult to prepare, and the functions of high heat insulation, high wave absorption and electromagnetic protection are difficult to consider at the same time, and the problem of low utilization rate of lignite is solved. The preparation method comprises the following steps: 1, carrying out ball-milling mixing and sieving treatment on the lignite, the adhesive, the dispersing agent and the deionized water; secondly, the blocky balsa wood is placed in the mixed slurry and subjected to vacuum impregnation; 3, freeze drying and carbonization; and 4, carbon thermal reduction. The method is used for preparing the SiC-based porous material from the balsa wood and the lignite.

The present invention relates to a process for continuously producing an ultra-high molecular weight polyethylene by the ethylene slurry polymerization, wherein raw materials containing ethylene and optionally at least one comonomer are subjected to a continuous slurry polymerization in a hydrogen free atmosphere in the ethylene slurry polymerization condition by using 2-6 ethylene slurry polymerization reaction tanks connected in series, and the deviations of the polymerization temperatures, the polymerization pressures, and the gas phase compositions between the tanks each other are controlled to certain ranges. The ultra-high molecular weight polyethylene having the viscosity-average molecular weight of 150-800 ×104 g / mol can be continously produced. This process has flexible polymerization manner, large room for adjusting and controlling, and stable polymer performance. Moreover, the obtained ultra-high molecular weight polyethylene has low metal content, low ash content, and excellent mechanical properties.

The invention relates to the technical field of mesophase pitch preparation, in particular to spinnable mesophase pitch and a preparation method thereof.The spinnable mesophase pitch is obtained through the following steps that firstly, aromatic hydrocarbon-rich raw material oil and an extraction solvent are extracted according to the proportion, then extracted oil and raffinate oil are obtained after standing sedimentation and separation, and then the spinnable mesophase pitch is obtained; the method comprises the following steps: filtering raffinate oil, carrying out atmospheric and vacuum distillation to obtain heavy raffinate oil, heating and distilling the raffinate oil to obtain refined raffinate oil, and finally, mixing the refined raffinate oil and the heavy raffinate oil in proportion, and carrying out thermal polycondensation reaction to obtain the product. The preparation method of spinnable mesophase pitch provided by the invention can deeply and accurately regulate and control the structure, composition and molecular weight distribution of aromatic hydrocarbon-rich raw oil, and has the characteristics of simple process flow and equipment, low preparation cost, controllable reaction conditions, easy realization of industrial production, high yield and the like. The prepared spinnable mesophase pitch has the characteristics of low softening point and high mesophase content.

The present invention relates to an efficient high-ash coal gasification spiral reactor, comprising an ash collector, a feed pipe is provided on the upper part of the ash collector, a high-ash coal inlet and an active substance inlet are provided on the feed pipe, and a high-temperature and high-pressure water inlet is also provided on the feed pipe; a spiral reaction groove is provided in the ash collector, the upper end of the spiral reaction groove is docked with the discharge port of the feed pipe, the lower end of the spiral reaction groove extends out of the ash collector or is connected with the outlet on the ash collector, and the spiral reaction groove is a spiral slideway structure with an arc-shaped cross section and a horizontally opened notch; and a slag discharge port is provided at the lower end of the ash collector. High-ash coal enters the feed pipe, and is modified by the active substance to improve the activity of the high-ash coal. Semi-coke with a high ash content is thrown out by centrifugal force into the ash collector and falls, and is discharged from the slag discharge port, thereby avoiding a large amount of ash from being heated, reducing the amount of high-temperature ash, not only improving the thermal efficiency, but also reducing the load of the ash cooling equipment, making it easier to cool.

A production device for preparing biomass fuel from straw comprises a solvent storage tank (1), a first delivery pump (4), a first heater (5), a first reaction tank (6), a first gas-liquid separation tank (7) and a first oil storage tank (8) which are communicated through a pipeline, the bottom of the first oil storage tank (8) is communicated with a first oil delivery pipe (9), and a second delivery pump (10) and a second heater (11) are installed on the first oil delivery pipe (9). One end of the first oil conveying pipe (9) is communicated with a dehydration reaction tank (12), one end of the dehydration reaction tank (12) is sequentially communicated with a second gas-liquid separation tank (13) and a solvent recovery tank (14) through a pipeline, and the solvent recovery tank (14) is further communicated with a solvent recovery pipe (15) and a dehydration liquefaction oil conveying pipe (16). The device is simple in structure and convenient to use, the ash content in the bio-oil is reduced, the production efficiency and quality of the bio-oil are improved, and the production cost is reduced.

The invention belongs to the field of pulping and papermaking and wastewater treatment, and particularly provides a method for removing metal elements, improving paper pulp performance and reducing wastewater COD (Chemical Oxygen Demand), which specifically comprises the following steps: preparing eucalyptus pulp by adopting a relatively mature pulping process, then mixing the air-dried eucalyptus pulp with ultrapure water according to a ratio of 1g: 50mL, adding acetic acid accounting for 0.05-0.3% of the added ultrapure water, and uniformly stirring to obtain a mixture; according to the eucalyptus pulp obtained after acid treatment, metal elements in the pulp are efficiently removed, damage to a fiber structure is small, the performance of the pulp is improved, wastewater COD can be effectively reduced, and therefore environmental pollution is reduced, and the wastewater treatment cost is reduced.

The invention provides coal-based Fischer-Tropsch synthetic fuel oil as well as a preparation method and application thereof. The preparation method of the coal-based Fischer-Tropsch synthesis fuel oil comprises the following steps: carrying out first fractionation, hydrofining and second fractionation on Fischer-Tropsch synthesis crude oil to obtain a hydrofined diesel oil fraction and hydrofined tail oil; then performing hydrocracking and third fractionation on the hydrofined tail oil to obtain a hydrocracking diesel oil fraction; in addition, each hydrocracking diesel oil fraction is rectified to obtain a side line component and coal-based Fischer-Tropsch synthesis fuel oil; and finally, fractionating the side components to obtain the coal-based Fischer-Tropsch synthetic fuel oil. According to the invention, the indirect coal liquefaction Fischer-Tropsch synthesis crude oil is subjected to fractionation, hydrofining, hydrocracking and fractionation to prepare three kinds of fuel oil. Compared with petroleum-based fuel oil, the coal-based Fischer-Tropsch synthesis fuel oil disclosed by the invention is low in sulfur and nitrogen content, low in acid value, low in ash content, rich in raw material resource and wide in source, and can be applied to household or industrial small combustors.

The invention discloses a lignite flotation and deashing device, which relates to the technical field of lignite sorting, and comprises a raw coal cleaning component, wherein the output end of the raw coal cleaning component is provided with a first crusher, the output end of the first crusher is provided with a first conveying track, the output end of the first conveying track is provided with a vibration screening component, the output end of the vibration screening component is provided with a second conveying track, the output end of the second conveying track is provided with a second crusher, the output end of the second crusher is provided with a third conveying track, the output end of the third conveying track is fixedly provided with a slurry mixing component, the output end of the slurry mixing component is connected with a clean coal flotation component through an output pump, and the work of screening and deashing from raw coal to lignite and clean coal is fully automated, and the transportation process is simplified, the deashing efficiency is further improved, and the quality of lignite is improved.

The invention relates to the field of combustion improvers, in particular to a decoking and coal-saving combustion improver and a preparation method thereof.The decoking and coal-saving combustion improver is prepared from, by weight, 1.0-6.0 parts of magnesium chloride, 2.0-7.5 parts of potassium chlorate, 1.5-11.0 parts of potassium perchlorate, 2.0-12.0 parts of calcium carbonate, 8.5-14.0 parts of calcium oxide, 4.0-7.5 parts of calcium hydroxide, 2.4-10.0 parts of catalyst, 8.5-11.5 parts of fatty acid, 1.5-2.5 parts of potassium hydroxide, 0.5-2.0 parts of acetic acid and 30.0-35.0 parts of activated carbon. The preparation method comprises the following steps: dividing raw materials into a group A, a group B and a group C; modulating the A group of raw materials based on a modulator; diluting potassium hydroxide in the group B raw material with pure water, adding activated carbon with a preset particle size, fully mixing and stirring, and drying; the raw materials of the group C, the treated raw materials of the group A and the treated raw materials of the group B are fully stirred and mixed to complete preparation of the decoking and coal-saving combustion improver, and the precipitation amount of coal tar in the combustion process is inhibited on the basis of improving the combustion efficiency of coal.

The invention relates to the technical field of solid waste resource utilization, and particularly discloses a solid alternative fuel based on gasification fine slag, the solid alternative fuel comprises, by weight, 10-40 parts of gasification fine slag, 10-40 parts of municipal sludge, and 30-70 parts of citrus fruit by-products, the molding density of the solid alternative fuel is 1.28 g / cm < 3 >, the compressive strength is 1.22 N / cm < 2 >, and the specific energy consumption is 10.65 J / g. The specific preparation process comprises the following steps: 1) respectively pretreating the raw materials; (2) mixing the pretreated raw materials; and (3) adding the mixed raw materials into granulation equipment, and extruding into the cylindrical solid alternative fuel with a smooth surface. The solid alternative fuel is prepared by adding the municipal sludge and the biomass on the basis of the gasified fine slag, the defect of low combustion heat value of the gasified fine slag is overcome, the ash content can be reduced, the solid alternative fuel meets the condition of resource utilization, the solid alternative fuel has high density and compressive strength, the solid alternative fuel can be conveniently transported and stored as a fuel product, and the solid alternative fuel is suitable for industrial production. And a new technical thought and direction are provided for the utilization of the gasified fine slag.

The invention discloses a method for increasing apatite phosphorus content in biochar, which comprises the following steps: mixing sludge, biomass, biochar and calcium oxide to prepare a mixed material, biologically drying the mixed material for less than or equal to 12 days, adding magnesium chloride after 25 hours in the biologically drying process, pyrolyzing the obtained biologically dried product to obtain the phosphorite phosphorus content in the biochar. The preparation of the biochar is completed. According to the method disclosed by the invention, under the combined action of calcium oxide and magnesium chloride, a biological drying product with low water content and high apatite phosphorus content can be formed through biological drying treatment; the content of phosphorite phosphorus in the biochar can be remarkably increased under the condition of low pyrolysis energy consumption through simple pyrolysis treatment, the biochar with the high phosphorite phosphorus content is obtained, and the method has the advantages of being simple in process, convenient to operate, low in cost, high in drying efficiency, small in pollution gas emission amount, low in energy consumption, environmentally friendly and the like; and the method has important promotion significance for realizing resource utilization of the sludge-based biochar.

This invention discloses a system, method, single-walled carbon nanotubes (SHUs), and battery prepared by magnetic field-assisted plasma CVD, relating to the field of materials technology. The system includes a plasma evaporation unit, a magnetic field screening unit, and a CVD growth unit arranged sequentially. The magnetic field screening unit includes a magnetic field screening cavity, a temperature control component, and a magnetic field generating component. The magnetic field screening unit is positioned between the plasma evaporation unit and the CVD growth unit. By applying a magnetic field and coordinating with temperature control, catalyst particles are screened. This unit selectively removes large-diameter catalyst particles while retaining small-diameter ones, allowing for precise control of the particle size distribution. This reduces the defect density and ash content of the SHUs from the source, overcoming the bottleneck of traditional processes in the mass production of SHUs and significantly improving product purity and structural consistency.

The invention discloses a production method of mesophase pitch. The method comprises the following steps: (1) performing countercurrent contact on catalytic slurry oil and an extraction solvent, and extracting under a supercritical condition to obtain an extraction component; (2) mixing naphthalene asphalt, the extraction component in the step (1) and an auxiliary agent, and carrying out modulation treatment to obtain an aromatic hydrocarbon-rich mixture; (3) carrying out reduced pressure distillation on the aromatic hydrocarbon-rich mixture in the step (2) at the segmentation temperature of 375-390 DEG C, and separating to obtain a heavy component and a light component I; (4) mixing the light component I in the step (3) with benzyl alcohol, contacting with an inert solid filler, and treating to obtain a treated light component II; and (5) carrying out co-carbonization treatment on the light component II obtained in the step (4) and the heavy component obtained in the step (3) in an inert atmosphere to obtain the mesophase pitch. The method not only integrates the advantages of the petroleum-based raw material and the naphthalene-based raw material, but also can obtain the mesophase pitch with high mesophase content, lower softening point and low content of impurities such as quinoline insoluble substances.