384 results about "Small particle" patented technology

The invention discloses a PHA / PVA nano-scale paper-based barrier emulsion as well as a preparation method and application thereof. The water-based emulsion comprises PHA particles with the average particle size ranging from 100 nanometers to 300 nanometers and PVA, the PHA and the PVA are blended according to a specific proportion, and the PVA serves as a main film forming component and a barrier property contribution component and is blended with the PHA to form the nano-emulsion. The preparation method comprises the following steps: mixing PHA particles with an initial average particle size of 1-100 microns with a PVA aqueous solution, and carrying out high-pressure homogenization and other nanocrystallization means to obtain the nano-emulsion. The emulsion can be coated on the surfaces of paper-based materials such as paper and paperboards, and a barrier coating is formed after the emulsion is dried. The obtained emulsion is small in particle size, good in stability and good in leveling property, a uniform and compact barrier film is easily formed on a paper base, the film has excellent water vapor, oxygen and grease barrier performance, and the material is bio-based, biodegradable and environmentally friendly.

The invention belongs to the technical field of coating production, and particularly discloses an outdoor durable powder coating preparation device and a preparation process thereof.The outdoor durable powder coating preparation device comprises a bridging column, a mixing barrel is fixed to the top of the bridging column, a discharging sleeve is arranged at the bottom of the bridging column, and a stirring device is arranged at the top of the bridging column; a transmission cavity penetrating to the bottom is formed in the bridging column, and a material conveying assembly is arranged in the transmission cavity. According to the device, a powder coating and a liquid solvent are injected into the material mixing barrel through the feeding pipe, then the material conveying assembly is driven to work through the driving shaft, and when the material conveying assembly works, stirred fluid in the material mixing barrel can be intermittently conveyed into the discharging sleeve; and then the stirring device is driven to stir the interior of the material mixing barrel while the material conveying assembly works, and the pneumatic assembly is driven to work to atomize and spray out fluid flowing out of the material conveying assembly, so that coated fine particles generated during material mixing are crushed.

The invention relates to the technical field of refrigeration cycle, and discloses a dry filter of an air conditioner refrigeration cycle system, which comprises a shell, a liquid inlet at the front end of the shell and a liquid outlet at the tail end of the shell, and a front filter plate and a rear filter plate are respectively mounted in the hollow annular table in a sliding manner. The space of the front drying cavity is increased, so that when small particles generated by pulverization of a drying agent are led to the rear drying cavity, the drying agent in the rear drying cavity is kept in a compact state at the moment, and it is ensured that the rear drying cavity has the capacity of adsorbing moisture in a refrigerant; when the space of the rear drying cavity is increased, small particles generated by pulverization of the drying agent are discharged out of the drying cavity, at the moment, the drying agent in the front drying cavity is kept in a compact state, and it is ensured that the front drying cavity has the capacity of adsorbing moisture in the refrigerant. Therefore, small particles generated by pulverization of the drying agent can be effectively cleaned, and moisture in the refrigerant can be reliably removed.

The invention discloses a sulfide electrolyte membrane with gradient particle size distribution as well as a preparation method and application thereof, and relates to the technical field of solid-state batteries. Firstly, a modified binder solution formed by blending polyurethane and butadiene rubber is prepared, a sulfide electrolyte, a modified binder and an organic solvent are prepared into three kinds of slurry with different particle sizes, and the slurry is prepared into a solid-state battery; the preparation method comprises the following steps: sequentially coating on a substrate according to the sequence of average particle sizes of sulfide electrolyte in the slurry from large to small, airing each layer of wet film and then coating the next layer to form a composite wet film with gradient distribution of particle sizes, and carrying out vacuum drying and hot rolling treatment to finally prepare the target electrolyte film. According to the method, a unique particle size gradient design is ingeniously constructed, large particles construct a framework, gaps are filled with small particles, the compactness of a film layer is optimized, and a continuous ion transmission channel is formed. The multi-layer wet film forming process is simple and high in controllability, the rate capability and the cycle life of the sulfide all-solid-state battery can be remarkably improved, and the multi-layer wet film forming process has great large-scale production and application potential in the field of high-energy-density all-solid-state batteries.

The invention relates to the field of porous materials, in particular to a silicon carbide regulated porous silicon carbide film material generated through in-situ reaction and a preparation method and application thereof. According to the porous silicon carbide film material blank, a framework is formed by original silicon carbide particle aggregate, a silicon-containing component and a carbon-containing component are contained in macropore gaps formed among particles, and in the sintering preparation process of the film material, the silicon-containing component and the carbon-containing component are subjected to an in-situ reaction to generate nanoscale or submicron silicon carbide crystal grains to fill the macropore gaps and form small pores. The original silicon carbide particles and / or the nano-scale or submicron-scale silicon carbide crystal grains are connected through sintering to obtain a hole-embedded hole structure. The innovation of the invention lies in that sintering among silicon carbide particles is promoted by adopting the activity of in-situ reaction, the problem that the pore structure cannot be regulated and controlled when macropores among aggregate particles in the transition layer of the silicon carbide film material are simply stacked and filled by small particles is solved, and the permeability of the silicon carbide film material is favorably improved.

The invention belongs to the technical field of crystal compound preparation, and particularly relates to a crystallization process of small-particle-size palmitic acid paliperidone. The invention discloses a small-particle-size palmitic acid paliperidone crystallization process, solves the problems of large particle size, non-uniform distribution and serious agglomeration of the existing process product, and meets the requirements of long-acting injection bulk drugs. The process comprises the following steps: adding paliperidone palmitate into a specific mixed organic solvent according to a solid-to-liquid ratio of 0.04-0.09 g / g, stirring, dissolving and filtering at 65-75 DEG C, transferring into a high-pressure closed crystallizer, and pressurizing to 1.0-1.5 MPa; cooling and decompressing in sections, stirring, filtering and washing, and drying in vacuum at the temperature of 40-50 DEG C and the vacuum degree of-0.1 MPa to obtain a finished product. According to the invention, the process parameters are accurately controlled, the product is an irregular short rod-like / granular crystal, the particle size is in a normal single peak, the Dv (90) is 7.866-9.514 microns, the HPLC (High Performance Liquid Chromatography) purity is greater than or equal to 99.92%, the yield is greater than or equal to 90.25%, micronization is not needed, the process is stable, the economical efficiency is good, and the industrial application value is realized.

The invention relates to a three-axis mechanical arm particle product filling and stacking device and method.The three-axis mechanical arm particle product filling and stacking device comprises a main body frame, a three-axis mechanical arm module, a weighing module, a vibration filling module, a discharging module and a product stacking module, the discharging module is movably installed on the table top of the main body frame, and a discharging opening of the discharging module can move to the position above the vibration filling module. The three-axis mechanical arm module comprises an X-axis transverse moving mechanism, a Y-axis moving mechanism, a Z-axis moving mechanism and a tail end executing mechanism. The discharging module, the vibration filling module, the weighing module and the product stacking module are all located on the same side of the X-axis transverse moving mechanism and are sequentially arranged in the X direction. According to the invention, the weighing module can be used for weighing the filled product every time, so that the problem of filling micro-particle products according to requirements is solved, and the filling efficiency and the filling qualification rate are improved.

The invention provides a micro-mirror chip, a micro-mirror device and an optical device, and belongs to the technical field of micro electro mechanical systems. The micro-mirror chip comprises a substrate, a micro-mirror array, an electrode, a light window and a fixing ring. The micromirror array is located on the first surface of the substrate, the electrode is located on the second surface of the substrate, and the first surface and the second surface are opposite in position in the thickness direction of the substrate; the fixing ring is fixed on the first surface of the substrate, the micro-mirror array is located in an in-ring space of the fixing ring, and the light window is fixed on the fixing ring and covers the micro-mirror array. In the packaging of the micro-mirror chip, the micro-mirror array is sealed in the sealed space formed by the substrate, the fixing ring and the light window, so that small particles do not fall into the environment where the micro-mirror array is located in the subsequent packaging process, the qualified rate of the packaged micro-mirror device can be improved, and the yield of the packaged micro-mirror device can be improved. Therefore, the yield of the packaged micro-mirror device is improved.

The invention discloses a preparation method and application of an ultrathin large-size hexagonal boron nitride nanosheet capable of being produced on a large scale, and belongs to the technical field of two-dimensional material preparation. The method comprises the following steps: 1, preparing a boron nitride dispersion solution; 2, performing ultrasonic oscillation on the boron nitride dispersion liquid by using an ultrasonic processor; 3, stirring the boron nitride dispersion liquid subjected to ultrasonic pretreatment at an ultra-high speed by using a wall breaking machine; and 4, centrifuging the stirred boron nitride, taking supernate, washing and drying to obtain the ultrathin large-size boron nitride nanosheet. The preparation method disclosed by the invention has the characteristics of simplicity, high efficiency, economy, environmental protection, high yield, high reliability, large-scale preparation and the like, and the prepared boron nitride nanosheet has the advantages of large sheet diameter, small thickness, uniform particles, high lattice integrity and the like, and can be applied to the fields of thermal management, energy storage and photoelectrochemistry of electronic devices.

The invention discloses microporous layer slurry, a microporous layer and a fuel cell, the microporous layer slurry comprises first carbon powder, second carbon powder and a mixed solvent, the mass ratio of the first carbon powder in the microporous layer slurry is 4-10%, the mass ratio of the second carbon powder in the microporous layer slurry is 2-6%, and the particle size of the first carbon powder is smaller than that of the second carbon powder; the microporous layer slurry is used for being coated on the surface of a substrate layer of the gas diffusion layer to form a microporous layer. Two kinds of carbon powder with different particle sizes are adopted, macropores can be effectively formed in the microporous layer in the process of coating the surface of the substrate layer, effective water and gas channels are established, water and gas transmission balance in the operation process of the fuel cell can be conveniently controlled, a large amount of water generated by the cathode under high power can be efficiently discharged out of the fuel cell, and the fuel cell efficiency is improved. The cathode flooding phenomenon and the anode antipole phenomenon caused by excessive water are avoided to a great extent, and the performance of the fuel cell under high current density can be improved.

The invention relates to a pharmaceutical formulation, e.g. a paediatric formulation, of odevixibat, which comprises a plurality of small particles. The formulation may be used in the treatment of liver diseases such as bile acid-dependent liver diseases, and particularly cholestatic liver diseases such as biliary atresia, progressive familial intrahepatic cholestasis (PFIC), Alagille syndrome (ALGS) and paediatric cholestatic pruritus. The invention also relates to a process for the preparation of the pharmaceutical formulation.

The invention relates to a centrifugal filtration device for solid-liquid mixed liquor. The filtering device comprises a rack, a liquid inlet channel and a filter, the filter is provided with a filter cartridge capable of rotating around a supporting structure, a collecting shell and a backwashing nozzle are arranged outside the filter cartridge, and a residue receiving container and a residue discharging channel are arranged inside the filter cartridge. Waste liquid is injected into the filter cartridge through the liquid spraying pipe, the filter cartridge rotates to generate centrifugal force, the liquid and fine particles are pushed to be thrown out, separated through the filter screen and collected to the clean liquid water tank, and large particle impurities are attached to the filter screen, removed through the back-flushing spraying head and finally guided out through the residue receiving container and the residue discharging channel. And the discharged impurity mixture flow is further subjected to liquid separation through a two-stage vibrating screen and is subjected to reflux treatment, and solid residues are collected in a centralized manner.

The invention relates to the technical field of electronic packaging and welding, and particularly discloses Ag-Cu-Ti-based composite brazing filler metal and a preparation method and application thereof. The composite material comprises the following components in percentage by weight: 87%-96.5% of Ag-Cu28 alloy powder, 3%-8% of TiH2 and 0.5%-5% of a reinforcing phase, and the reinforcing phase is Ag-coated titanide or ceramic particles. According to the method, the comprehensive welding performance of the brazing filler metal is improved by adopting a method of coating the reinforcing phase with Ag, and meanwhile, the negative influence caused by adding the reinforcing phase is overcome. Aggregation of reinforced phase particles can be reduced through Ag coating, uniform distribution of the reinforced phase fine particles in the brazing filler metal is achieved, and generation of large brittle phases is greatly reduced. And meanwhile, the fluidity of the brazing filler metal is enhanced, the joint filling capacity of the brazing filler metal is improved, and the welding voidage of a connector is effectively reduced. In addition, the Ag coating can avoid the reaction between the reinforcing phase and the Ti element, and the influence of the reinforcing phase on the melting point of the brazing filler metal is reduced.

The invention discloses environmental particulate spherical powder and a preparation method thereof. The preparation method comprises the following steps: selecting artificially synthesized CMAS powder or natural solid particles as a preparation raw material; the preparation method comprises the following steps: sequentially carrying out ball milling, high-temperature melting, quenching and solid-phase sintering on a CMAS powder raw material to obtain a crystalline CMAS block; the method comprises the following steps: carrying out ball milling on natural solid particles or crystalline CMAS blocks to obtain fine particle powder, and obtaining a high-temperature melting characteristic curve of the fine particle powder; preparing the fine particle powder into slurry, and carrying out spray granulation to obtain powder particles with a target size; the powder particles are subjected to low-temperature sintering to remove the binder, then high-temperature sintering densification treatment is conducted, the environmental particulate matter spherical powder is obtained, and the densification treatment temperature is determined based on a high-temperature melting characteristic curve. The prepared powder has excellent flowability and compactness, the particle size range of the powder is controlled to be 20-500 microns, the spherical powder with concentrated particle size distribution can be obtained after screening, and a high-quality and standardized material can be provided for research of aero-engine related thermal protection technologies.

The invention discloses a small-particle compound fertilizer, a production process and equipment thereof. The small-particle compound fertilizer is processed by adopting a high-tower granulation process, and the particle size is 1.2-1.8 mm; according to the production process of the small-particle compound fertilizer, the diameter of a spray hole in a granulation spray head is in a range of 1.2-1.8 mm, and the rotation speed of the granulation spray head is not less than 450rpm; the small-particle compound fertilizer production equipment comprises a high tower main body, a liquid supply mixer, a granulation spray head, an air inlet and a collector, and further comprises an air injection assembly which is annular and coaxially arranged on the periphery of the granulation spray head; the air injection assembly is fixed on the bottom surface of a top partition plate in the high tower main body; and the air injection assembly downwards blows compound fertilizer slurry liquid drops thrown out by the granulation spray head in an obliquely downward manner. The compound fertilizer is small in particle, can be rapidly dissolved in water, is high in fertilizer efficiency and can be fully absorbed and utilized by crops.

The invention discloses a fluorescent whitening agent with high dispersion stability, a preparation method and an application method, and belongs to the technical field of textile printing and dyeing. The invention introduces a fluorescent whitening agent with the characteristics of small particle size, high stability, strong whitening ability and the like. The fluorescent whitening agent is a dispersion liquid composed of a whitening agent filter cake, a dispersing agent, a solvent, a thickening agent, water and the like. The whitening agent is applied to whitening processing of polyester and blended fabrics thereof, and can show higher whiteness under the condition of lower dosage; and even under the condition that a leveling agent is not added, a uniform whitening effect can be obtained, fluorescent spots or yellow spots are not formed, and high-quality whitened fabric can be obtained.

The utility model discloses a corundum brick raw material mixing device which comprises a mixing barrel, a grinding structure, a main mixing structure, an auxiliary mixing structure and a transmission structure, the grinding structure is arranged in the mixing barrel, the main mixing structure is arranged below the grinding structure, and the auxiliary mixing structure is arranged below the grinding structure. The power input end of the main mixing structure is coaxial with the working end of the grinding structure; the plurality of auxiliary mixing structures are arranged outside the main mixing structure at equal angles and are respectively connected with the main mixing structure through a transmission structure. By arranging the grinding structure, raw materials with large granularity can be ground, so that the raw materials can participate in mixing with smaller granularity, the impact and abrasion of the raw materials on equipment are reduced, and the operation stability of the equipment is improved; raw materials can be in a more complex motion state, the stirring time is shortened, and the stirring efficiency is improved.

The invention relates to the technical field of chemical production waste residue treatment, in particular to chemical product production waste residue treatment equipment. Comprising a box body, a feeding port is formed in the top of the box body, a discharging port is formed in the bottom of the box body, a crushing mechanism is arranged in the box body and used for crushing chemical waste residues, a partition plate is arranged in the middle of the box body, and discharging ports are formed in the two sides of the partition plate; and a stirring mechanism connected with the crushing mechanism is arranged in the box body and is used for stirring the crushed chemical waste residues. According to the chemical waste residue treatment device, through the arranged crushing mechanism, chemical waste residues can be crushed multiple times through a crushing barrel, crushing teeth, crushing cutters, telescopic cutters and the like, the chemical waste residues become small particles through multiple times of crushing, recyclable resources in the chemical waste residues can be rapidly separated out, the reaction time of the chemical waste residues in treatment liquid can be shortened, and the treatment efficiency is improved. The working efficiency is improved, and the chemical waste residue treatment speed is increased.

This invention provides a method and apparatus for helical acoustic wave suspension constraint and motion control, belonging to the fields of biology, pharmaceuticals, chemical engineering, and semiconductor silicon chip manufacturing. The method utilizes multiple transducers to obtain focused helical acoustic waves, and uses these focused helical acoustic waves to achieve the suspension of matter in three-dimensional space, as well as control the spatial position and movement of the matter. This invention enables the suspension or movement of minute particles in space, achieving contactless operation and improving stability. Based on a special transducer position design, this invention achieves inward helical focusing of helical acoustic wave energy, with outward interference amplitudes canceling each other out, thereby maximizing the utilization of acoustic wave energy and achieving focused acoustic wave energy. This invention utilizes the combination of transducer array spatial position and acoustic wave phase to obtain a ring-shaped helical acoustic wave. This device can serve as a scientific research apparatus for further research into helical acoustic wave technology.

The application discloses a filter core material and a preparation method thereof, and belongs to the technical field of water purification filter cores. The filter core material comprises the following components in percentage by mass: a honeycomb support matrix: 15-60%; a filter substrate: 30-40%; and a coating substrate: 0-50%. The filter core material and the preparation method thereof maintain a stable support structure during the preparation of a gamma-Al2O3 / BN composite ceramic layer through polypropylene and cellulose nanofiber. The filter substrate is obtained through gradient low-temperature sintering, effectively removes small particles and pollutants in water, and has excellent filtering performance. The active carbon fiber and polyether sulfone are coated on the filter substrate through electrospinning, which ensures good filtering performance and water permeability, improves the wear resistance and compressive strength of the filter core, and removes the honeycomb support matrix through high-temperature combustion, further improves the water permeability, and the active carbon fiber is physically activated during the combustion process, further improving the adsorption capacity.

The present application relates to a kind of high-efficiency lossless preparation multi-element wafer assembly method, the method utilizes the high bonding strength of water boiling glue epoxy adhesive, excellent water boiling glue, glue layer soft characteristics, so that piezoelectric ceramic small particle does not fall in wafer assembly preparation process, substrate removal is simple and easy, and does not damage the electrode surface of piezoelectric ceramic small column, including the following steps: surface treatment;Gluing;Cutting;Washing, normal temperature air dry;Low-temperature prebaking, fill high molecular decoupling material, remove the decoupling material on the electrode surface of piezoelectric ceramic small particle clean;Solidification;Polish and remove substrate;Remove excess particles to form approximately circular wafer assembly;Positive and negative electrode line lead out.The present application prepares multi-element wafer assembly method, utilizes the high bonding strength of water boiling glue epoxy adhesive, good impact resistance characteristics, overcomes the problem that its bonding strength is reduced due to factors such as water vapor and temperature in preparation process, and does not damage the electrode surface of piezoelectric ceramic small column.

The utility model belongs to the technical field of polyvinyl chloride discharging, and particularly discloses polyvinyl chloride particle quantitative discharging equipment which comprises a discharging hopper, a bottom frame is arranged below the discharging hopper, a material collecting frame is movably arranged at the top end in the bottom frame, and a material collecting bin is formed in the top of the material collecting frame. A waste bin is formed in the material collecting frame, a driving mechanism is arranged at the front end of the bottom of the material collecting frame and matched with the material collecting frame, a connecting mechanism is arranged in the opening, and a guide column is arranged in the discharging hopper. By changing the heights of the two ends of the material receiving frame, quantitative discharging operation of materials is completed, meanwhile, the materials can be dispersed and layered in the material receiving bin, and fine particles, impurities and the like in the materials are filtered in a vibrating mode.

The application discloses a high solid content water-based epoxy emulsion which is prepared from the following components in parts by weight: 10 parts of water-based epoxy emulsifier, 50-65 parts of bisphenol A type epoxy resin, 3-15 parts of hyperbranched polyether epoxy resin and 20-25 parts of deionized water. The high solid content water-based epoxy emulsion can greatly reduce the viscosity of the emulsification system due to the hyperbranched structure, thereby preparing a stable emulsion with smaller particle size, the cavities contained in the emulsion can effectively toughen the epoxy coating, the rich epoxy end groups can improve the crosslinking density of the coating, the coating curing is more sufficient, the barrier property of the coating is further improved, and the application value is high in actual use. The solid content of the hyperbranched polyether water-based epoxy emulsion prepared by the application is up to 75% or more, the stability is excellent, and the coating cured after actual use has excellent toughness and medium resistance.

This utility model belongs to the field of semiconductor manufacturing technology and discloses a wafer basket handle, including a top plate; two handles, which are arranged opposite each other and connected to the top center of the top plate; four stepped grooves, with every two stepped grooves symmetrically arranged at the bottom of the handle; and four cushioning pads, each cushioning pad being embedded in the corresponding stepped groove. This utility model, by providing a mounting groove at the top center of the top plate, allows the two handles to rotate within the mounting groove via cotter pins. The two corners of the handle's grip end are press-fitted with urethane rubber cushioning pads with a Shore A hardness, which can replace the hard contact between the handle and the top plate, thereby reducing impact force, high-frequency vibration, and the generation of fine particles.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and provides a small-particle precursor for a manganese-rich positive electrode material and a preparation method of the small-particle precursor. The manganese-rich precursor with fine primary particles and large specific surface area is prepared by using the non-ammonia complexing agent, an oxidizing atmosphere is not needed, the preparation process is simple, the process control is stable, and mass production conversion is facilitated.

The invention discloses a bubble generating mechanism, a micro-nano bubble host comprising the bubble generating mechanism and application of the bubble generating mechanism in the processing technology of photovoltaic cells. The bubble generating mechanism comprises an outer shell and an inner shell which are sleeved with each other, a liquid flow channel allowing liquid to flow through is formed in the middle of the inner shell and comprises a first flow channel, a throat part and a second flow channel, and the end, close to the second end, of the first flow channel is connected with the throat part; the inner diameter of the throat portion does not exceed the inner diameter of the end, close to the second end, of the first flow channel, the inner diameter of the second flow channel is gradually increased in the direction close to the second end, the inner surface of the second flow channel is a smooth wall face, the air inlet flow channel communicates with the liquid flow channel in the circumferential direction, and the air inlet flow channel communicates with the throat portion in the circumferential direction. And the inner surface of at least partial area of the first flow channel is a spiral flow channel. The bubble generating mechanism can ensure that the generated micro-nano bubbles are smaller in particle size and more stable.

The invention discloses a lipid nano-micelle preparation method, which comprises: (1) providing an amphiphilic lipid alcoholic solution with a concentration of 20-50 mg / mL and a buffer solution, the buffer solution being selected from a PBS buffer solution, a citrate buffer solution, a Tris-HCl buffer solution or an acetate buffer solution; (2) mixing the alcoholic solution of the amphiphilic lipid and a buffer solution according to the flow velocity ratio of the alcoholic solution of the amphiphilic lipid to the buffer solution of (2-4): 1 by adopting microfluidic mixing equipment to obtain a mixed product; and (3) carrying out liquid change on the mixed product by using a buffer solution to remove the alcohol solvent. On the premise of ensuring the small particle size of the lipid nano-micelle, the uniformity and narrow particle size distribution of the lipid nano-micelle are improved, and the target of batch-to-batch reproducibility is achieved. The method does not need to use dangerous chemicals, is high in safety, is simple to operate, is low in amplification production difficulty by combining a microfluidic technology with a liquid change technology, is low in energy consumption, can effectively improve the production efficiency, and reduces the production cost.

The application belongs to the technical field of nanometer material synthesis, and provides a preparation method of an interface-assembled hollow sheet structure silica-based material, which comprises the following steps: dispersing a sulfate aqueous solution and alcohol in an organic solvent containing an amphiphilic polymer to form a stable oil-water interface; then adding an ammonia source to generate an ammonium sulfate salt template at the oil-water interface and catalyze the hydrolysis and condensation of the subsequently added silicon source to coat the surface of the ammonium sulfate crystal; and finally removing the water-soluble salt template and small-particle impurities through centrifugal water washing and alcohol washing to obtain the hollow sheet structure silica nanometer material. The preparation method is simple and economical, and has good repeatability. The silica prepared by the application has a well-defined hollow sheet structure, and is expected to be applied in the biomedical field.

The utility model belongs to the technical field of evaporative crystallization equipment, and relates to a high-temperature crystallization tower which comprises a crystallization tower main body, a crystallization pipe, a solution spraying area and a material screening device, a crystallization pipe, a solution spraying area, a material screening device and a mixing and returning area are sequentially arranged in the crystallization tower main body from top to bottom, the mixing and returning area is communicated with the solution spraying area, and a discharging opening of the material screening device abuts against the material plate vibration piece. According to the utility model, through the multilayer arrangement of the crystallization pipes and the vertical layered layout of the solution spraying area, the staged temperature control in the decomposition reaction process is realized, and the generation of tiny crystal nucleuses is reduced through atomization crystallization; the material screening device is matched with the material plate vibration piece, crystallization products can be dynamically screened, fine particles which do not reach the standard participate in crystallization circulation again through the mixing and returning area, and the crystallization integrity is improved.

This invention provides a clarifier for black and odorous water bodies, its preparation method, and its application. The preparation method includes the following steps: thoroughly mixing a polyacrylamide solution with a carrier at a mass ratio of polyacrylamide to carrier of 1:99 to 5:95; granulating, drying, grinding, and sieving to obtain a solid; and compounding the solid with the carrier to obtain the clarifier for black and odorous water bodies. The carrier is one or more of bentonite, diatomite, and kaolin that has passed through a 200-mesh sieve. In this invention, fine particles such as bentonite, diatomite, and kaolin are added to the prepared low-concentration polyacrylamide solution. After thorough mixing, granulation, drying, and grinding, the polyacrylamide forms a thin film on the surface of the bentonite, diatomite, and kaolin, which can be quickly dissolved in water. Therefore, the clarifier for black and odorous water bodies provided by this invention does not require pre-dissolution and can be directly added as dry powder to wastewater, making it more convenient and cost-effective.