26results about How to "Good sphericity" patented technology

The invention provides a large-particle narrow-span distribution ternary precursor and a preparation method and application thereof, and belongs to the technical field of batteries, the preparation method comprises the following steps: ammonia concentration in a base solution A is 2.0-5.0 g / L, a nickel-cobalt-manganese metal salt solution, ammonia water and an alkali solution are introduced into the base solution A in a parallel flow manner, a first coprecipitation reaction is carried out, and a nickel-cobalt-manganese ternary precursor seed crystal is prepared; in the first coprecipitation reaction, the stirring rotating speed is 150 to 350rpm; a base solution B is prepared, the ammonia concentration in the base solution B is 5.0-7.0 g / L, a nickel-cobalt-manganese metal salt solution, ammonia water and an alkali solution are introduced into the base solution B in a parallel flow mode, a second coprecipitation reaction is conducted, and a nickel-cobalt-manganese ternary precursor is prepared; in the second coprecipitation reaction, the stirring rotation speed is 150 to 280 rpm. The problems that nickel-cobalt-manganese ternary precursor particles are prone to cracking and agglomeration are solved, and therefore the precursor narrow in particle size distribution and good in sphericity degree is obtained.

The invention discloses a preparation method of intermediate carbon microspheres, which comprises the following steps of: preparing precursor asphalt by taking naphthenic base aromatic hydrocarbon-rich heavy oil as a raw material and adopting a low-temperature thermal polycondensation process; the preparation method comprises the following steps: carrying out fluidized bed hydrotreatment on precursor asphalt under proper reaction conditions by matching with a proper isomerization functional catalyst and a molecular sieve catalyst to obtain refined aromatic hydrocarbon-rich distillate oil with a boiling range of more than 400 DEG C, and taking the refined aromatic hydrocarbon-rich distillate oil as a raw material; the preparation method comprises the following steps: carrying out a catalytic polycondensation reaction under the dual catalytic action of a heteropolyacid aluminum salt catalyst and a heteropolyacid ferric salt catalyst to obtain intermediate pitch, extracting the intermediate pitch through an extraction solvent, removing isotropic pitch components to obtain green carbon microspheres, and finally carrying out carbonization treatment on the green carbon microspheres to obtain the mesocarbon microbeads. The invention provides a brand new aromatic hydrocarbon-rich raw material refining treatment process through technical coupling, has the advantages of wide raw material application range and high production efficiency, and opens up a new path for low cost and high quality of mesocarbon microbeads.

The invention belongs to the technical field of water treatment materials, and particularly relates to a coal gasification slag unfired ceramsite filter material as well as a preparation method and application thereof. The coal gasification slag thermal insulation material comprises the following raw materials in parts by weight: 67.5-95 parts of coal gasification slag, 5-15 parts of active powder, 0-20 parts of metakaolin, 2-8 parts of expanded perlite, 0.1-0.5 part of a foam stabilizer and 1-3 parts of a foaming agent. The unfired ceramsite filter material has the advantages of being reusable, green and environment-friendly in preparation process, low in follow-up treatment cost, capable of being reused after failure and the like.

The present invention provides a rare earth metal modified layered positive electrode material for sodium ion batteries and a preparation method thereof. The main structure of the rare earth metal modified layered positive electrode material for sodium ion batteries is an O3 phase, and the chemical formula is NaNi a Fe b Mn c Re d O 2 , 0.28≤a≤0.33, 0.28≤b≤0.33, 0.28≤c≤0.33, 0≤d≤0.05, Re represents a rare earth metal element; the layered positive electrode material includes spherical secondary particles, the secondary particles include a plurality of stacked flaky primary particles, part of the rare earth metal elements are distributed on the surface of the secondary particles in the form of rare earth metal oxides, and part of the rare earth metal elements are doped in the layered positive electrode material lattice in the form of rare earth metal ions. The positive electrode material provided by the present invention is modified based on rare earth metal elements, and has good sphericity and rich pore structure. The battery containing the positive electrode material exhibits excellent rate performance and good cycle stability.

The invention belongs to the technical field of ceramic tube preparation, and particularly relates to a pressureless sintered silicon carbide grinding medium and a preparation method thereof. The invention relates to a preparation method of a pressureless sintered silicon carbide grinding medium, which comprises the following specific steps: proportioning: preparing basic materials of the silicon carbide grinding medium according to the weight ratio: 98-99 wt% of submicron silicon carbide and 1-2 wt% of boron carbide; ball-milling and mixing; performing spray granulation; intensely stirring, mixing and granulating; drying the biscuit; dewaxing the biscuit; and sintering at high temperature to finish preparation. The preparation method is simple in technological process, use of large forming equipment such as a dry press and a cold isostatic press is avoided, the production input cost is greatly reduced, and the prepared pressureless sintered silicon carbide grinding medium is good in sphere sphericity degree, high in density, high in strength, high in toughness, ultrahigh in wear resistance, long in service life, resistant to high temperature and good in chemical stability.

The invention discloses a preparation method of high-nitrogen steel powder with ultrahigh nitrogen content, which specifically comprises the following steps: adding the high-nitrogen steel powder into a vacuum boiler filled with nitrogen for heating, and continuously stirring to uniformly heat the powder and avoid agglomeration at the same time; after heat preservation is conducted for a proper time, a filter screen window below the boiler is opened, meanwhile, a lower powder outlet of the boiler is opened, and powder in the boiler is screened through a filter screen under the action of high-pressure nitrogen jet flow; the screened powder falls into a liquid nitrogen pool for rapid cooling and nitrogen dissolving treatment; and after the powder is treated by liquid nitrogen for a certain time, a filter screen at the bottom of the liquid nitrogen pool is opened to treat redundant liquid nitrogen and screen the powder, and finally the high-nitrogen steel powder with the ultrahigh nitrogen content is obtained in the liquid nitrogen pool. According to the method, the high-nitrogen steel powder with the ultrahigh nitrogen content can be obtained on the basis of traditional high-nitrogen steel powder preparation, and the method has the advantages of being simple in process, low in cost, high in practicability, convenient to achieve industrial production and the like.

This invention relates to the field of refractory materials technology, and more particularly to a cementless magnesia castable and its application method. The castable consists of aggregate, matrix material, and a water-reducing agent; the aggregate is 60-80 parts of magnesia particles; the matrix material is: fine magnesia powder, active α-Al₂O₃ micro powder, sintered corundum powder, silica micro powder, and aluminum-based metal microcapsules. The application method of the cementless magnesia castable is as follows: the water-reducing agent and matrix material are mixed evenly to obtain a premixed matrix material; the aggregate and premixed matrix material are stirred evenly, water is added and wet-mixed to obtain a slurry; the evenly mixed slurry is poured into a mold, vibrated to form the slurry, and then cured. This cementless magnesia castable exhibits certain initial strength, excellent high-temperature performance, excellent resistance to slag erosion and thermal shock, and a long service life, making it widely applicable in tundishes and ladles.

The present invention relates to the technical field of positive electrode materials, and in particular to a nano-sheet spherical structure NC high-nickel precursor for NCA positive electrode materials and a preparation method thereof. The present invention adopts a continuous flow extraction method to prepare a high-nickel precursor, and the method comprises: (1) preparing a binary metal mixed solution with nickel, cobalt inorganic salts and a first complexing agent, preparing a complexing agent solution with a second complexing agent and a dispersant, and preparing a soluble hydroxide into a precipitant solution; (2) adding water and inert gas into a reactor, introducing a complexing agent solution and a precipitant solution to maintain stirring and modulating a bottom liquid; (3) continuously introducing a metal mixed solution, a complexing agent solution and a precipitant solution into the reactor, and continuously increasing the flow rate of the metal mixed solution for co-deposition reaction; (4) the reacted material is post-treated to obtain a NC high-nickel precursor. The present invention adopts a one-step synthesis of a NC high-nickel precursor for NCA positive electrode materials, which has a nano-sheet structure, good sphericity, narrow particle size distribution, good consistency and high porosity.

This invention relates to the field of nanomaterials technology, specifically to a method for preparing silica using continuous flow. The method involves mixing an organic base, a surfactant, and water to obtain solution A; mixing a silicon source and an organic solvent to obtain solution B; reacting solutions A and B through a continuous flow apparatus, separating the solid product, and calcining it to obtain silica; wherein the flow rates of solutions A and B are 5-10 mL / min, and the reaction temperature is 20-45℃. In this method, silica is prepared using a continuous flow process, and the prepared silica has a nanosphere morphology with a specific surface area of ​​200-800 m². 2 / g, with a pore size distribution of 2-50 nm and a particle size distribution deviation (PDI) of less than 2%.

The invention discloses a carbon-containing silicon dioxide hollow sphere and a preparation method thereof. The shell of the hollow sphere is composed of three elements of Si, O and C. The preparation method is as follows: adding a polyacrylic acid aqueous solution to ammonia water to obtain a mixed solution; adding the mixed solution to ethanol to obtain a milky white emulsion; dropping a mixed silicon source into the milky white emulsion, stirring and mixing, and centrifugation drying to obtain a product; the product is subjected to heat treatment and heat preservation treatment to obtain a carbon-containing silicon dioxide hollow sphere. The preparation method of the present invention has simple process and mild reaction conditions. By controlling the mass ratio of the mixed silicon source, the amount of the template agent and the heat treatment conditions, a carbon-containing silicon dioxide hollow sphere with a smooth surface, excellent sphericity, good dispersibility, and controllable outer diameter and carbon content is obtained. The obtained carbon-containing silicon dioxide hollow sphere not only has the performance advantages of silicon dioxide and carbon materials, but also has a complete and controllable hollow structure, and the dielectric properties of the hollow sphere are adjusted by regulating the carbon content in the shell.

This invention provides a method for preparing iron-based amorphous powder, the iron-based amorphous powder, and its applications. The preparation method includes: weighing iron, silicon, ferroboron master alloy, carbon, erbium, and chromium in a predetermined proportion and adding them to a melting furnace to obtain a molten liquid; holding the molten liquid at a constant temperature and allowing it to stand to obtain an amorphous powder liquid; and subjecting the amorphous powder liquid to water-air combined atomization to obtain spherical amorphous powder. This invention solves the problem in the prior art where the amorphous powder has an irregular shape and sharp edges, which easily leads to the accumulation of losses and affects the performance and stability of the magnetic core.

The invention relates to the technical field of inorganic non-metallic materials, in particular to a method for producing electric melting zirconium oxide solid spheres by using a titration method. The method comprises the following steps: uniformly mixing zirconium oxide powder and a stabilizer to form a mixed raw material; and preparing a consumable electrode by adopting the mixed raw material, then melting the end part of the consumable electrode into zirconium oxide melt, and dripping to form the electric melting zirconium oxide solid ball. The method comprises the following steps: melting the end part of a consumable electrode to form a zirconium oxide solution, gathering the zirconium oxide solution into liquid drops with a certain size under the action of surface tension, and naturally dropping from the tail end of the electrode under the action of gravity to prepare the electric melting zirconium oxide solid sphere. The preparation method is short in technological process, and the prepared product is good in sphericity degree, high in density and uniform in chemical component.

The invention provides polyamide 12 / modified boron nitride composite powder as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. Boron nitride is stripped into boron nitride nanosheets by utilizing high-pressure homogeneous impact force, shearing force and hole effect, a dispersing agent rich in hydroxyl groups is introduced into the boron nitride to modify the boron nitride into hydroxylated boron nitride, and the dispersity and compatibility among the modified boron nitride, polyamide 12 liquid drops and a solvent are obviously improved; the prepared composite powder has good sphericity, narrow particle size distribution and excellent mechanical properties, and can be well applied to powder materials for selective laser sintering.

The invention belongs to the technical field of drug crystallization, and provides metformin hydrochloride and fenofibrate double-drug-loading particles and a preparation method thereof.The preparation method comprises the following steps that polysaccharide, a solvent I and metformin hydrochloride are mixed and heated, and a homogeneous solution is obtained; mixing the homogeneous solution, fenofibrate and triglyceride to obtain a suspension; a cross-linking agent, a solvent II and the suspension are mixed and placed in a crystallizer to be subjected to a crystallization reaction, and a crystallization solution is obtained; and carrying out solid-liquid separation on the crystallization liquid, washing, and drying to obtain the double-drug-loading particles. The obtained particles are in a solid state and have good stability compared with a micelle drug loading system, meanwhile, the operation unit is simplified by adopting an in-situ crystallization means in the carrier, operation such as mixing, grinding and spray drying is not needed, needed equipment is simple, operation is easy and convenient, and good technical economy and high application value are achieved.

The present application relates to the technical field of preparation of tritium breeder, in particular to a method for batch preparation of Li2TiO3 tritium breeding microspheres and rich phase structure by centrifugal granulation, comprising the following steps: S1, Li2TiO3 ceramic powder is pretreated by spray granulation, then sprayed with a solution of xanthan gum for granulation, and sieved to obtain a green body; S2, the green body is added into a centrifugal granulator, and a second binder solution is sprayed at the same time, so that Li2TiO3 microsphere seeds with a preset diameter are generated by centrifugal granulation; S3, then the second binder solution is sprayed while lithium-containing ceramic powder is added for granulation and bonding; S4, the process of S3 is repeated until ceramic microsphere green bodies with the required diameter are obtained; S5, then deionized water is sprayed in the granulator and continues to roll for 3-8 min; S6, the ceramic microspheres obtained in S5 are dried at constant temperature and humidity, degummed, and sintered. The method can realize batch preparation of high-lithium-content tritium breeding microspheres with single-phase structure or multi-phase structure.

The invention discloses a preparation method of antioxidant nano-copper particles based on an intermediate metastable state, which comprises the following two steps: firstly, reacting copper salt with a first reducing agent and a pH regulator for 10-40 minutes in a first organic solvent of 70-130 DEG C to obtain copper-based intermediate particles of 20-25 nm; and then dispersing the intermediate in deionized water, adding a second reducing agent, a pH regulator and a coating agent, reacting at 70-130 DEG C for 20-60 minutes, so that the coating agent and copper atoms are deposited and synchronously bonded in situ under an alkaline condition to form a continuous coating layer with the thickness of 4-10nm, and finally obtaining the antioxidant nano-copper particles with the particle size of 30-40nm and high sphericity through epitaxial growth control. According to the preparation method, nucleation and growth processes are accurately regulated and controlled under mild conditions, and the nano-copper particles which are uniform in particle size, high in sphericity degree and long-acting in oxidation resistance are directly prepared.

The invention discloses an imrecoxib solid preparation and a preparation method thereof, and belongs to the technical field of pharmaceutical preparations, the solid preparation comprises the following components by mass: 15-25% of imrecoxib, 10-40% of pea maltodextrin, 10-40% of Soluplus, 1-3% of poloxamer, 10-30% of a filler, 10-20% of a disintegrating agent, 0.8-1.2% of a flow aid and 0.8-1.2% of a lubricant. Through synergistic interaction of triple carriers, Soluplus inhibits drug crystallization by means of hydrogen bonds and promotes dispersion; the poloxamer reduces the surface tension and improves the dispersity and the dissolution rate; the pea maltodextrin plays an anti-oxidation role, improves the sphericity, fluidity and stability of the particles, and is low in cost. Aiming at the difficulties that imrecoxib is low in solubility, easy to oxidize and the like, medicine dissolution is remarkably improved, related substances are more stable, and both process robustness and cost control are considered.

This invention belongs to the field of lithium manganese iron phosphate cathode material preparation, and relates to a method for preparing spherical high-density lithium manganese iron phosphate cathode material. This invention utilizes the acid solubility of phosphoric acid to spherically modify the surface of the lithium manganese iron phosphate precursor. The phosphate ester and phosphate diester bonds contained in phosphoric acid can form phosphorus-rich soluble substances with iron, manganese, and other metal elements in the precursor under heating conditions. These substances can dissolve the metal ions on the precursor surface under water bath heating, and then the metal ions are redeposited onto the precursor surface by water bath cooling. Through repeated water bath heating, cooling, and stirring, the crystal planes of the precursor are dissolved and regrown, ultimately forming a spherical precursor.

The invention provides a preparation method of a lithium-rich manganese-based ternary precursor. The preparation method comprises the following steps: respectively preparing a nickel-cobalt-manganese mixed salt solution, a sodium carbonate solution and an ammonia water solution; adding water and ammonium bicarbonate into the preparation device, controlling the pH value of the solution in the reaction kettle to be 7-11, then adding a reducing substance, introducing protective gas into the preparation device, and keeping the solution in the preparation device to circulate; the prepared three solutions are introduced into a reaction kettle for stirring reaction, the reaction temperature is 45-65 DEG C, the pH value of the solutions is 7.0-9.0, and shielding gas is continuously introduced in the reaction; starting a cleaning function of the concentration machine after feeding for 1-6 hours, and continuously increasing the alkalinity and temperature of the solution and reducing the stirring rotating speed; and aging, alkali washing, water washing and drying the reaction product to obtain the lithium-rich manganese-based ternary precursor. The lithium-rich manganese-based ternary precursor prepared by the preparation method of the lithium-rich manganese-based ternary precursor provided by the invention can be used for preparing a lithium-rich manganese-based positive electrode material with high capacity and long cycle.

The invention discloses a silver-silicon dioxide spherical powder and its preparation method and application. The preparation method of the silver-silicon dioxide spherical powder of the present invention comprises the following steps: 1) preparing acidic silica sol; 2) mixing silver nitrate solution and acidic silica sol to prepare a solution to be atomized; 3) bonding a microporous metal film to a polarized annular piezoelectric ceramic sheet to obtain an atomizing sheet; 4) installing the atomizing sheet into an ultrasonic atomizer, and adding the solution to be atomized into a liquid storage tank of the ultrasonic atomizer, and then performing spray atomization and natural sedimentation to obtain a spherical gel; 5) heat treating the spherical gel. The silver-silicon dioxide spherical powder of the present invention has good sphericity, smooth surface, adjustable conductivity, and adjustable particle size in a wide range, and its preparation method is simple, the equipment requirements are low, and the production cost is low, which fully meets the application requirements of conductive silver paste for LTCC, and is suitable for large-scale application in the field of electronics industry.

This invention provides an MC-type carbide-reinforced Nb-based alloy spherical powder, its preparation method, and its application, belonging to the field of metal material preparation technology. The invention involves distributing the MC-type carbide-reinforced Nb-based alloy spherical powder according to its composition, followed by suspension induction melting and casting to obtain a master alloy ingot. The master alloy ingot is then machined to obtain an Nb-based alloy electrode rod. Using the Nb-based alloy electrode rod as raw material, powder is produced by plasma rotating electrode atomization to obtain the MC-type carbide-reinforced Nb-based alloy spherical powder. The MC-type carbide-reinforced Nb-based alloy spherical powder prepared by the method of this invention has uniform composition, controllable particle size with a narrow distribution range, good sphericity, low O and N content, and high purity, making it suitable for additive manufacturing.

This invention discloses a method for preparing high-density, large-particle-size spherical alumina powder, belonging to the field of inorganic non-metallic material preparation technology. The method uses industrial aluminum hydroxide or industrial alumina containing a transition phase as raw material. It involves introducing 1-10% α-alumina seed crystals and 1.0-3.0% composite mineralizer (containing boron and fluorine sources) by mass of the raw materials. After mechanical mixing, the mixture is calcined in air at 1350-1550℃ for 2-8 hours. Finally, the mixture is cooled, dispersed, and sieved to obtain the final product. This invention, through the synergistic effect of seed crystals and composite mineralizer, simultaneously achieves α-phase transformation, densification, grain growth, and morphology control of alumina powder under mild calcination conditions. It successfully prepares alumina powder with an α-phase content ≥96%, true density >3.96 g / cm³, median particle size D50 ≥50 μm, and a regular spherical morphology. This method is simple, low-cost, and the product is suitable for high-filling thermally conductive fillers, showing great promise for industrial application.

This invention discloses a nozzle atomizing device for preparing spherical metal powder, belonging to the field of metal powder technology. The nozzle of this invention features an optimized internal flow channel structure and is made of high-temperature resistant material, which improves the quality and consistency of the metal powder. It includes a molten metal container; a stepped liquid guide tube connected to the outlet of the molten metal container; an inner nozzle with multiple circular holes arranged in a ring below the outlet of the stepped liquid guide tube; and an ultrasonic atomizing device. This invention employs a two-stage device with different structures, an optimized combination of injection angle and a stepped liquid guide tube, achieving a dual, strong atomization effect from the nozzle, which is beneficial for obtaining metal powder with good sphericity and high fine powder yield. The gas atomizing nozzle of this invention is suitable for the production of metal powder, especially in the field of additive manufacturing.

The application discloses an X-MCM-41 mesoporous molecular sieve microsphere adsorbent and a forming method and application thereof, and aims at the forming problem of X-MCM-41 molecular sieve powder in the application of sanitary napkins, urine pads and other products, and provides a technology for preparing 40-60 mesh microsphere adsorbents by atomizing and blowing forming with attapulgite and sesbania gum as a composite binder. The technology comprises the following steps: preparing X-MCM-41 mesoporous molecular sieve powder, preparing atomizable slurry by mixing X-MCM-41 mesoporous molecular sieve powder, attapulgite, sesbania powder and water; obtaining green microspheres by controlling atomization parameters; and obtaining the final product by drying through programmed temperature and constant humidity and roasting under specific conditions. The core contradiction between mechanical strength (toughness, hardness) and mesoporous structure (specific surface area) in the X-MCM-41 forming is solved. The obtained microsphere adsorbent has high strength, low pulverization rate, high specific surface area retention rate, can be directly applied to personal care products, can efficiently adsorb irritating odor molecules such as ammonia, trimethylamine and hydrogen sulfide, and can improve the comfort and safety of products.

The invention relates to hydration heat inhibition particles for concrete and a preparation method thereof. The hydration heat inhibition particles are prepared by wrapping 65-75 wt% of phase change material particles with 25-35 wt% of shell layer composite material powder; the phase-change material particles are composed of 20-40 wt% of a low-temperature phase-change material and 60-80 wt% of a high-temperature phase-change material, the low-temperature phase-change material and the high-temperature phase-change material are subjected to high-temperature melting and uniform mixing, ice water is dripped into the mixture through a dripping nozzle for cooling granulation to prepare the phase-change material particles, then the phase-change material particles are placed in a disc granulator, and the shell composite material is added for granulation. The hydration heat inhibition particle for concrete prepared by the invention is uniform in shell thickness, high in structural stability, high in strength, good in sealing property, excellent in sphericity degree and good in concrete compatibility, and can tolerate 100 times of heat cycles at 20-80 DEG C without cracks; after being doped into concrete, the concrete admixture state can be improved, the temperature gradient in the concrete hydration period is remarkably reduced, and the cracking risk is remarkably reduced.

The invention discloses a synthesis method of porous polylactic acid microspheres, and belongs to the field of biomedical materials. The method comprises the following steps: preparing a first water phase taking a water-soluble polymer as a pore-foaming agent, and dispersing the first water phase in a polylactic acid organic solution to form a water-in-oil-in-water primary emulsion; introducing the primary emulsion into a curing bath containing a poor solvent, so that the organic solvent is extracted, the polylactic acid is cured, and microspheres wrapping pore-foaming agent liquid drops are formed; and finally, washing to remove the pore-foaming agent to form a porous structure. The core of the method is that the internal water-phase liquid drops are used as a sacrificial pore-forming template, and the microspheres are cured by a solvent extraction method. The method is mild in condition, green and environment-friendly, the aperture, porosity, particle size and pore connectivity of the microspheres can be independently and accurately regulated and controlled by adjusting parameters such as emulsification conditions and phase proportion, and the prepared microspheres have the characteristics of open pores and high connectivity and have excellent application prospects in the fields of drug sustained release and tissue engineering.