290results about How to "Process environmental protection" patented technology

The invention discloses a reconstruction upgrading method of a waste lithium battery ternary positive electrode material and a lithium-rich manganese-based material prepared by the same, ternary lithium positive electrode material powder of a waste lithium ion battery is mixed with a metal source and a fluxing agent, ball milling is performed to obtain intermediate product powder, and the metal source comprises one or more of a manganese source, a nickel source, a cobalt source and a lithium source; and sintering the intermediate product powder in an aerobic atmosphere to obtain the single-crystal lithium-rich manganese-based material. According to the method, lost elements are supplemented by adding corresponding metal sources, a crystal structure is repaired, the ternary positive electrode of the waste lithium ion battery is upgraded and regenerated into a high-value single-crystal lithium-rich manganese-based positive electrode, and the high-energy-density single-crystal positive electrode obtained through short-step reconstruction, upgrading and regeneration is assembled into the lithium ion battery for reuse. The three engineering problems of scarcity of raw material resources, recycling of waste lithium ion batteries and high-energy density requirements of power batteries are solved at a time.

The invention belongs to the technical field of new materials in textile engineering, and provides an antibacterial aromatic microfiber suede fabric and a preparation method thereof. The preparation method comprises the following steps: putting a fabric into a 2-methylimidazole solution for dipping treatment; after the dipping treatment is finished, adding a zinc source solution into a 2-methylimidazole solution for reaction to obtain a fabric with MOF nanorods growing on the surface; depositing the electrostatic spinning nanofibers loaded with the aromatic essential oil on a fabric with MOF nanorods growing on the surface to obtain an antibacterial aromatic spinning base cloth layer; and bonding the antibacterial aromatic textile base cloth layer on the microfiber suede layer to obtain the antibacterial aromatic microfiber suede fabric. The antibacterial fragrant microfiber suede fabric prepared by the method is applied to an automotive interior material, so that the automotive interior material has better antibacterial performance and fragrance release function.

The invention discloses a synthesis method of phosphorus-containing polysilazane. The synthesis method comprises the following steps: S1, preparing solid methyl hydrogen polysilazane; s2, solid methyl hydrogen polysilazane is dissolved in an organic solvent, phosphate ester is added, the mixture is stirred to be uniform, then a Karst catalyst is added, and a phosphorus-containing polysilazane solution is obtained after a heating reaction. The phosphorus-containing polysilazane solution obtained through combined action of polysilazane and phosphate containing a vinyl structure is applied to an anti-corrosion coating, the anti-corrosion coating with the thin thickness can be obtained, and the adhesive force and the salt spray resistance are excellent. According to the invention, self-made phosphorus-containing polysilazane is adopted, phosphate is connected to polysilazane through chemical modification, the salt spray resistance effect is improved, the storage stability is good, phosphorus liquid passivation treatment is not needed, and the process is green and environment-friendly.

The invention discloses environment-friendly plastic product in-mold coating processing equipment which comprises an in-mold coating device, a color paste conveying device, a mixing head and a forming mold, the in-mold coating device comprises an A material tank used for supplying A materials and a B material tank used for supplying B materials, and the color paste conveying device comprises a C material tank used for supplying C materials; the material A, the material B and the material C are mixed in the mixing head to form a reaction forming coating, and the discharging end of the mixing head is connected with the coating feeding end of the forming mold. The environment-friendly plastic product in-mold coating processing equipment is high in equipment integration degree, capable of reducing processing procedures, stable, flexible and convenient to operate, capable of obtaining high-quality product surfaces with various color effects and capable of being flexibly and freely matched with different types of injection molding machines and turnover mold frame equipment according to the production requirements of customers, and the production efficiency is improved. And the production requirements of customers in different application scenes can be met.

According to the gasification fine slag dewatering and drying method and system based on the fluidized bed dryer, gasification fine slag with high water content can be dewatered and dried, the energy utilization rate is high, and waste of water resources is little. The method comprises the following steps: 1) carrying out flash evaporation concentration, sedimentation and filtration dehydration on the coal gasification black water in the black water treatment unit; (2) gasified fine slag to be treated is fed into a fine slag preheater to be subjected to heat exchange with a heating medium; 3) carrying out heat exchange on the preheated gasified fine slag and the superheated steam in a fluidized bed dryer to obtain dried gasified fine slag and secondary steam; 4) feeding the secondary steam into a secondary steam dust removal unit for dust removal treatment, and then feeding the secondary steam into a fine slag preheater; (5) the secondary steam output by the fine slag preheater is fed into a steam preheater for heat exchange, and preheated secondary steam is obtained; (6) the preheated secondary steam is fed into a steam superheater to be subjected to superheating treatment, and superheated steam is obtained; and feeding the superheated steam into a fluidized bed dryer.

The invention discloses a water-soluble phosphonated polybenzimidazole polymer and a preparation method thereof, and particularly, under the protection of nitrogen flow, 3, 3 '-diaminobenzidine and diphosphonic acid substituted aromatic dicarboxylic acid react for 6-30 hours at 180-250 DEG C by taking polyphosphoric acid as a medium, and the phosphonated polybenzimidazole polymer is obtained through polycondensation. The phosphonated polybenzimidazole polymer disclosed by the invention has good solubility in water under an alkaline condition, can be used as a solvent in subsequent processing, has the characteristics of no pollution and environmental protection, is easy to recover and has a wide application prospect.

The preparation method comprises the following steps: 1) dispersing an unmodified Prussian white positive electrode material and sodium ferrocyanide in deionized water according to a ratio to obtain a manganese-based Prussian white material mixed solution; 2) adding an acid substance into the manganese-based Prussian white positive electrode material mixed solution, and forming an iron-based Prussian blue coating layer on the surface of the manganese-based Prussian white positive electrode material through ion exchange to obtain a solid material; 3) carrying out separation treatment on the solid material; and 4) drying the separated solid material to obtain the iron-based Prussian blue coated Prussian white positive electrode material. The problems of metal ion dissolution and structural distortion caused by the ginger Taylor effect are effectively inhibited, the structural stability, the rate capability, the long cycle performance, the overall electronic conductivity and the ion diffusion rate of the material are remarkably improved, and the preparation method is simple in process, low in equipment requirement, low in cost and suitable for large-scale production.

The invention relates to an electrode material for lithium extraction, a preparation method of the electrode material, a lithium extraction electrode and a lithium extraction system, belongs to the field of salt lake lithium extraction, and solves at least one of the problems of fast capacity fading, relatively low overall lithium extraction efficiency and short service life of a lithium extraction electrode for an alkaline solution in the prior art. A preparation method of an electrode material for lithium extraction comprises the following steps: mixing an electrode active material with a rare earth salt solution, and forming a phosphate rare earth layer on the surface of the electrode active material in an in-situ coating manner; the electrode active material comprises lithium iron phosphate and a doped derivative thereof. When the preparation method, the obtained electrode material, the lithium extraction electrode and the lithium extraction system are applied to lithium extraction of salt lake brine, especially alkaline brine, at least one of the cycle performance, the lithium extraction efficiency and the service life is remarkably improved.

The invention belongs to the technical field of a new energy material lithium ion battery positive electrode material, and particularly relates to a tungsten-niobium co-doped nickel-rich ternary positive electrode material and a preparation method thereof. According to the preparation method, a precursor subjected to tungsten-niobium mixed pretreatment is calcined to obtain the double-element co-doped nickel-rich ternary positive electrode material. Compared with an undoped sample and a single-element doped sample, the prepared co-doped sample can effectively enhance the structural stability of the material, reduce the polarization of an electrode and improve the diffusion kinetics of lithium ions, so that the cycling stability and the rate capability of the battery are improved at the same time.

The invention provides a method for efficiently extracting light-color lignin and application. The method comprises the steps that bamboo is smashed, bamboo powder is screened out and dried, then formic acid is used for pretreatment and filtration to obtain solid residues, deionized water is used for washing the solid residues to be neutral, and solid matter is obtained after drying; treating the solid substance by using a tetrahydrofurfuryl alcohol / p-toluenesulfonic acid aqueous solution system, filtering out insoluble impurities to obtain filtrate, washing the insoluble impurities by using a tetrahydrofurfuryl alcohol aqueous solution and deionized water until the insoluble impurities are neutral, and reserving a washing solution; and adding water into the filtrate and the washing liquid for precipitation to obtain light-color lignin. According to the method for extracting the lignin, the yield is 66.9%, the purity is 99.64%, the obtained lignin is light in color (lightness: 70.48), the molecular weight of the obtained lignin is moderate (Mw: 4695), and the negative influence of the extraction process on lignin structural units is limited.

The invention discloses a green and environment-friendly sodium ion battery hard carbon negative electrode material preparation method, which comprises: S1, pre-carbonization: pre-carbonizing a biomass raw material under a protective atmosphere to obtain a pre-carbonized material; s2, granularity control treatment: crushing and refining the pre-carbonized material obtained in the step S1 to obtain a refined pre-carbonized material; s3, preparation of a precursor material: stirring and dispersing the refined pre-carbonized material obtained in the step S2, an acid solution and deionized water to form precursor slurry, carrying out temperature-controlled sanding, and then carrying out solid-liquid separation, water washing and drying to obtain the precursor material; s4, high-temperature sintering: performing high-temperature carbonization on the precursor material obtained in the step S3 in a protective atmosphere to obtain a purified hard carbon material; and S5, high-temperature carbon coating: carrying out high-temperature carbon coating on the surface of the purified hard carbon material obtained in the step S4 to obtain the surface-coated hard carbon negative electrode material. The preparation method has the characteristics of greenness, environmental protection, excellent electrochemical performance and good processability.

The invention provides a high-airtightness food container which comprises a container body, the container body is formed by folding sheet-shaped paper, the upper end of the container body is open, the container body is provided with a bottom wall and a peripheral wall adjacent to the bottom wall, and at least one seam line is formed on the bottom wall or the peripheral wall. The seam line is located at a seam formed by overlapping at least two layers of sheet-shaped paper materials, and an edge seam position is formed at the tail end of the outer edge of the seam line; wherein one part of the area of the bottom wall and / or the peripheral wall of the container body is covered with an airtight film layer, all edge joint positions are covered with airtight film layers, and at least one part of the area of the bottom wall and / or the peripheral wall is not covered with an airtight film layer. According to the high-airtightness food container, the airtightness of the food container can be guaranteed, the weight ratio of the airtight film layer is reduced, the food container is more environmentally friendly, and a user can use the food container conveniently.

The invention relates to a nanocellulose-silicon-based hybrid material, preparation and application thereof and a thermoplastic polymer composite material. Comprising the following steps: combining nano SiO2 containing hydrophilic hydroxyl on the surface with hydroxyl on the surface of cellulose, then adding a silane coupling agent, reacting and hydrolyzing the silane coupling agent to obtain silanol, combining the silanol with hydroxyl on the surface of nano SiO2 particles and hydroxyl on the surface of nano cellulose, drying, dehydrating the silanol into siloxane, and grafting the siloxane on the surface of nano cellulose / SiO2, thereby obtaining the nano SiO2 / silanol composite material. Grinding to obtain a nanocellulose-silicon-based hybrid material, blending the obtained hybrid material with a thermoplastic polymer matrix, and preparing a corresponding product through a thermal forming process. The process is environment-friendly, the method is simple, the product is easy to form, operation and control are simple and convenient, and industrial production is facilitated; the prepared hybrid material has good stability, dispersibility and polymer matrix compatibility, and shows excellent mechanical properties and thermal properties when applied to thermoplastic polymers.

The invention relates to a regeneration treatment method and application of a degradable high polymer material, and the regeneration treatment method comprises the following steps: degrading the degradable high polymer material in a system in which an organic nonmetal catalyst and a water-containing solvent exist to obtain a degradation product; wherein the degradable high polymer material comprises one or more of a polyester material and a polycarbonate material; the organic nonmetal catalyst is selected from one or more of diphenyl phosphate, binaphthol phosphate and organic alkali. By adopting the specific organic non-metal catalyst, efficient degradation of the degradable high polymer material can be realized, the degradation speed is high, the conversion rate is high, the reaction yield is high, and the cost is low; degradation products can be effectively utilized again as valuable chemicals.

The invention provides an iron-silicon-aluminum magnetic powder core and a preparation method and application thereof. The Fe-Si-Al magnetic powder core comprises a Fe-Si-Al magnetic powder base body and a coating layer coating the surface of Fe-Si-Al magnetic powder. And the coating layer comprises silicon dioxide and aluminum phosphate. According to the Fe-Si-Al magnetic powder core provided by the invention, the silicon dioxide and the aluminum phosphate are used as the mixed insulating coating layer, so that the resistivity of the Fe-Si-Al magnetic powder core is increased, the eddy-current loss among particles is effectively reduced, meanwhile, the maximum forming density of the material is ensured, and a relatively high saturation magnetic flux density Bs is obtained, so that a high direct-current superposition characteristic is obtained; and the aim of giving consideration to low loss and high direct current superposition characteristics is fulfilled.

The invention discloses a preparation method for improving water resistance and dyeing stability of noctilucent fiber and application thereof.The preparation method comprises the steps that firstly, a rare earth luminescent material SAOED is modified, hydroxyl on a chain of the rare earth luminescent material SAOED and hydroxyl generated by hydrolysis of HDTMS under the conditions of heating and the like are subjected to a dehydration condensation reaction, and the problem that the rare earth luminescent material SAOED is prone to hydrolysis in water is effectively solved; the water resistance of the luminescent powder is improved; in consideration of subsequent processing and application of the prepared noctilucent fiber, SiO2 with good light transmission is used for carrying out inorganic coating on the modified SAOED, so that a good luminous master batch protection effect is achieved under the condition of relatively small influence on the brightness of the noctilucent fiber, and dyeing of the noctilucent fiber is facilitated. According to the method, a low-temperature carrier dyeing method is adopted, the dye is diffused to the fiber by utilizing the plasticizing and puffing effects of the carrier, the dyed noctilucent fiber is high in afterglow intensity and good in dyeing fastness, and the method is simple in process, low in cost and high in safety.

The invention provides a thermoelectricity-hydrogen-methanol green co-production system and method. The system comprises an alkaline electrolytic cell module, a hydrogen separation and purification module, an oxygen separation module, a preheating module, a thermoelectric production module, a flue gas pretreatment module, a CO2 capture module and a CO2 hydrogenation methanol preparation module. CO2 capture is carried out on flue gas generated by coal-fired thermoelectricity, and resource utilization is carried out; meanwhile, hydrogen prepared by green electricity water electrolysis hydrogen production not only can be output and supplied, but also can be used for methanol preparation together with captured CO2, and prepared high-purity oxygen and part of flue gas subjected to flue gas pretreatment are supplied to a thermoelectric production module, so that oxygen-enriched combustion of coal is realized, the CO2 content in the flue gas can be greatly increased, CO2 capture is facilitated, and the energy consumption is reduced. Under the condition that thermoelectric supply is not affected, CO2 emission can be greatly reduced, hydrogen and methanol which are urgently needed by the market can be prepared, and meanwhile the whole process is green and environmentally friendly.

According to the gasification fine slag dewatering, drying and recycling method and system provided by the invention, by adopting the scheme, gasification fine slag with high water content can be dewatered and dried and can be used as fuel for resource utilization. The method comprises the following steps: 1) treating coal gasification black water in a black water treatment unit to obtain flash steam and gasification fine slag to be treated; 2) feeding the gasified fine slag to be treated into a fine slag preheater, and preheating by using a heating medium; (3) the preheated gasified fine slag is fed into a drying device to be subjected to heat exchange with superheated steam, and dried gasified fine slag and secondary steam are obtained; (4) the secondary steam is subjected to dust removal treatment, and the obtained secondary steam subjected to dust removal is fed into a fine slag preheater to serve as the heating medium; (5) the secondary steam output by the fine slag preheater is subjected to superheat treatment, and superheated steam is obtained; feeding the superheated steam into a drying device for heat exchange; and 6) feeding the dried gasified fine slag as fuel into a combustion unit for use.

The invention discloses a colored fluorescent particle for electrophoretic display, and relates to the field of photoelectric display, the colored fluorescent particle is of a core-shell structure, and the colored fluorescent particle sequentially comprises a core, a middle layer and a shell layer from inside to outside; the core is a pigment unit, the middle layer is a quantum dot layer coating the surfaces of pigment particles, the shell layer comprises one or more high-molecular polymers selected from polylauryl methacrylate and polymethyl methacrylate, and the surface of the middle layer is coated with the shell layer; the color fluorescent particles comprise intrinsic primary colors presented by the pigment units and compensation fluorescence excited by the quantum dot layer under light; and the compensation fluorescence is matched with the intrinsic primary color. In addition, the invention also provides a preparation process of the colored fluorescent particles. The colored fluorescent electrophoretic particle provided by the invention is pure and full in color and luster, and is more gorgeous in color under the excitation of ultraviolet rays.

The utility model discloses a cooling water pipe of an injection mold, and relates to the field of injection mold cooling equipment. The cabinet comprises the cabinet body, the water inlet pipe, the first water outlet pipe and the second water outlet pipe, the cleaning mechanism is arranged on the outer side of the water inlet pipe, the cleaning mechanism is arranged, a magnetic ring slides on the outer side of an extension pipe to control an internal magnetic ring to move, and the purpose of easily controlling a cleaning rod from the outside is achieved through magnetic connection; the cleaning rod is tightly attached to the filter screen, impurities are effectively removed, blockage is avoided, smoothness and purity of cooling water are guaranteed, cooling efficiency is improved, shutdown time is remarkably shortened, production efficiency is improved, the requirements of environmental protection and sustainable production are met, the first valve body controls water flow to enter the extension pipe, and in addition, the first valve body and the second valve body control the water flow to enter the extension pipe. The collecting shell and the first valve body are connected through the flange ring, dismounting and cleaning are easy, and therefore continuous cleaning and efficient operation of the cooling water pipe system are maintained.

The invention relates to a transparent antistatic protective film and a preparation method thereof, and belongs to the technical field of composite film materials, the transparent antistatic protective film specifically comprises a base material, a polythiophene antistatic layer and a silver-plated nanowire transparent antistatic functional coating, the polythiophene antistatic layer and the silver-plated nanowire transparent antistatic functional coating are attached to the base material, the surface resistance of the transparent antistatic protective film is 104-108 ohm, the optical transmittance is 65-90%, and the thickness of the transparent antistatic protective film is 10-20 micrometers. The preparation method comprises the following steps: 1, taking a pretreated base material, coating the surface of the base material with a polythiophene antistatic liquid, putting the base material into a drying oven, and taking out the base material after drying to obtain a base material coated with a polythiophene antistatic layer; and 2, coating a silver-plated nanowire transparent antistatic functional coating on the polythiophene antistatic layer obtained in the step 1, and drying in a drying oven to obtain the transparent antistatic protective film. The method is rich in raw material source, simple in preparation process and short in production period, and the problems that in the prior art, the optical transmittance is low, the antistatic performance is unstable, and curing of the functional coating is affected due to the fact that conductive filler is added into the functional coating can be effectively solved.

According to the gasification fine slag dewatering and drying method and system based on the spray dryer, gasification fine slag with high water content can be dewatered and dried, the energy utilization rate is high, and waste of water resources is little. The method comprises the following steps: 1) carrying out flash evaporation concentration, sedimentation and filtration dehydration on the coal gasification black water in the black water treatment unit; (2) gasified fine slag to be treated is fed into a fine slag preheater to be subjected to heat exchange with a heating medium; 3) spraying the preheated gasified fine slag and superheated steam into a spray dryer for heat exchange to obtain dried gasified fine slag and secondary steam; 4) feeding the secondary steam into a secondary steam dust removal unit for dust removal treatment, and then feeding the secondary steam into a fine slag preheater; (5) the secondary steam output by the fine slag preheater is fed into a steam preheater for heat exchange, and preheated secondary steam is obtained; (6) the preheated secondary steam is fed into a steam superheater to be subjected to superheating treatment, and superheated steam is obtained; the superheated steam is fed into a spray dryer.

The invention provides a supersonic jet adopting supersonic double wings and belongs to the field of novel supersonic civil aircrafts, an S-shaped bent large slenderness ratio variable cross-section fuselage is adopted as a fuselage, large-area truncated delta wings with edgings on the inner sides are adopted as inner sections of wings, engine nacelles are arranged on the upper portions of the outer ends of the wings, the small-area supersonic double wings are installed on the outer side of the engine nacelle, the tail wing adopts the design of a single vertical tail and an inverted V tail, the acoustic explosion intensity can be reduced, meanwhile, the functions of the wing inner section, the supersonic double wings and an engine nacelle supporting structure are achieved, the structural efficiency is effectively improved, and the structural weight is reduced. By the adoption of the supersonic double-wing design, it can be guaranteed that the aircraft achieves ideal environment-friendly performance and aerodynamic efficiency, the front edge and the rear edge of the supersonic double wings are movable, the problem that the performance of non-design points of conventional double wings is poor is solved, and the aircraft can have high aerodynamic performance within the flight envelope range.

The invention belongs to the technical field of photo-thermal water and power cogeneration, and particularly relates to a preparation method of super-hydrophilic photo-thermal carbon fiber cloth and a water photovoltaic power generation sheet. The preparation method comprises the following steps: dispersing photo-thermal conversion particles into a sodium dodecylbenzene sulfonate solution to obtain a photo-thermal conversion coating, soaking carbon fiber cloth into the photo-thermal conversion coating to enable the photo-thermal conversion particles to be attached to the carbon fiber cloth to obtain the photo-thermal carbon fiber cloth, and drying the photo-thermal carbon fiber cloth to obtain the photo-thermal carbon fiber cloth. And then the surface of the photo-thermal carbon fiber cloth is coated with a thermoplastic polyurethane solution to improve the hydrophilic property of the photo-thermal carbon fiber cloth, and therefore the super-hydrophilic carbon fiber cloth with the high photo-thermal conversion performance is prepared. In the photo-thermal evaporation process, different photo-thermal conversion particle loading capacities of the carbon fiber cloth present different evaporation rates, different thermoplastic polyurethane solution brushing times of the carbon fiber cloth present different contact angles and interface evaporation temperatures, the generating capacity of the water photovoltaic power generation sheet is tested, and finally efficient photo-thermal water-power cogeneration application is achieved.

The invention discloses a method for separating and recovering valuable elements in zinc leaching residues, which comprises the following steps: mixing the zinc leaching residues with a sulfuric acid solution, adding a reducing agent, stirring to react under certain conditions, and performing solid-liquid separation after the reaction is finished to obtain filtrate 1 and filter residues 1; mixing the filter residue 1 with an oxalic acid solution, carrying out a stirring reaction under certain conditions, after the reaction is finished, filtering to obtain a filtrate 2 and a filter residue 2, carrying out a neutralization reaction on the filtrate 2 to hydrolyze and precipitate tin in the solution, and filtering to obtain a filtrate 3 and a stannous hydroxide precipitate; mixing and stirring the filtrate 1 and the filtrate 3, and filtering to obtain filtrate 4 and ferrous oxalate precipitate; according to the method, valuable elements in the zinc leaching residues are separated and recycled one by one, especially for Ga, Ge, In and Sn which are low in grade, effective enrichment and recycling can be achieved, maximum utilization of valuable metal resources is achieved, and generation of solid waste is reduced.

The invention relates to the technical field of copper-molybdenum separation inhibitors, and discloses a preparation method of a polythiocarboxylic acid amine copper-molybdenum separation inhibitor, which comprises the following steps of: separating and purifying tail liquid generated by preparing thionocarbamate to obtain sodium thioglycolate, and reacting with carbon disulfide by taking potassium hydroxide as a catalyst to obtain the polythiocarboxylic acid amine copper-molybdenum separation inhibitor. The novel polythiocarboxylic acid amine copper-molybdenum separation inhibitor is obtained. The resource utilization of the thionocarbamate tail liquid is realized, the raw materials are cheap and easy to obtain, and the process is green and environment-friendly. The polythiocarboxylic acid amine copper-molybdenum separation inhibitor has the advantages of being good in adaptability, safe, environmentally friendly, good in inhibition effect, simple in process, wide in production raw material source and the like.

The invention relates to the technical field of waste gas recovery treatment equipment, in particular to an integrated waste gas recovery treatment device for lithium battery production, which comprises a bracket, a tower body is mounted in the bracket, an upper partition plate and a lower partition plate are connected in the tower body, and the interior of the tower body is sequentially divided into a solid-gas separation chamber, a washing chamber and an absorption chamber by the two partition plates from bottom to top; filter screens are connected into the washing chamber and the absorption chamber, the bottom of the tower body is communicated with an ash hopper, a spiral gas injection pipe extending into the solid-gas separation chamber is mounted at the lower part of the tower body, gas delivery pipes are mounted on the two partition plates, and annular liquid spraying pipes located above the filter screens are connected into the washing chamber and the absorption chamber. A plurality of functional units for cyclone separation of particles and gas, gas washing, harmful gas absorption and the like are integrated in the tower body, the integration level is high, meanwhile, due to the compact design, the tower can efficiently operate in a limited space, the treatment efficiency is high, the occupied area is small, and the energy consumption and the operation cost are reduced.

The application discloses a preparation method of three-dimensional hollow carbon spheres. The three-dimensional hollow carbon spheres are prepared by one-step pyrolysis method through the three-dimensional network structure of melamine foam and the compounding of MOFs materials. The method is simple in process, environment-friendly, low in cost and capable of industrial production. The three-dimensional hollow carbon spheres prepared by the method have uniform and good micro-morphology, the carbon spheres are hollow in the inside, each carbon sphere has four branches connected with other carbon spheres, and multiple carbon spheres are connected to form a three-dimensional network structure.

The utility model discloses an automobile front bumper, and belongs to the field of automobile parts, the automobile front bumper comprises a framework and a mask, the mask is vertically arranged, the two ends of the mask are bent backwards, the framework comprises a plurality of vertical strip frames, a first transverse strip frame and a second transverse strip frame, and the first transverse strip frame and the second transverse strip frame are arranged along the top and the bottom of the inner side face of the mask respectively; the first transverse strip frame and the second transverse strip frame are connected through a plurality of vertical strip frames, one vertical strip frame is located at the left end of the face mask, the other vertical strip frame is located at the right end of the face mask, the vertical strip frames are arranged close to the inner side face of the face mask, and the framework is integrally formed through plastic materials. And by adopting the integrally formed skeleton structure made of the plastic material, the light weight of the product is realized, and the consistency of the product is improved.

The invention discloses a method for synthesizing a cefvimicin mother nucleus by an enzymic method, which belongs to the technical field of medicine synthesis, and comprises two working sections: 1, removing a carboxyl protecting group from a double-protection mother nucleus Sm to obtain an aqueous solution of a salt of an intermediate A; and 2, removing an amino protecting group from the intermediate A by an enzymic method to obtain the cefvimicin mother nucleus. The process for preparing the cefvimicin mother nucleus is green and environment-friendly, does not have harsh conditions such as no water, no oxygen, ultralow temperature and the like, does not generate substances with strong corrosivity, is friendly to production equipment, is easy to recycle a waste solvent, and has low wastewater treatment requirements.