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724results about How to "Uniform particle size distribution" patented technology

Process of directly preparing rare-earth compound from extraction separation load organic phase

InactiveCN101602519ASolve the problem of high residual acid and large acid consumptionEliminate the step of stripping rare earthRare earth metal compoundsProcess efficiency improvementDispersityRare earth
The invention provides a process of directly preparing a rare-earth compound from an extraction separation load organic phase. The process comprises following steps: carrying out a mixed precipitation reaction between a precipitator solution and the load organic phase which is obtained from extraction separation and contains rare-earth; post-treating the filter cake obtained by filtering slurry liquid so as to obtain the rare-earth compound with good dispersity and uniform particle size distribution; and returning the organic phase to the extraction separation working procedure for recycling use. The process of extracting and separating rare-earth omits the rare-earth stripping step, saves a great amount of acid needed by the rare-earth in a stripping load organic phase and solves the problems of stripping difficulty of medium-heavy rare-earth, high spent acid of a stripping solution, and the like. The invention uses the precipitator to precipitate the rare-earth from the organic phase, and the whole precipitation reaction is carried out on an oil-water interface to effectively control the grain size. Meanwhile, a trace organic phase is attached to grain surfaces and is used as a surface active agent to reduce the mutual adsorption action of grains for deflocculation. The invention can obtain products with good dispersity and uniform grain size distribution, thereby being a new method for preparing a high-quality rare-earth compound material. The invention has simple process, is easy to realize the industrialized production and has low production cost.
Owner:GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1

Method for preparing porous spherical Li(1-x)MxFe(1-y)Ny(PO4)([3+(alpha-1)x+(beta-2) y]/3)/C material

The invention discloses a method for preparing a porous spherical Li(1-x)MxFe(1-y)Ny(PO4)([3+(alpha-1)x+(beta-2) y]/3)/C material, comprising the specific steps of: dissolving a lithium-containing compound, an iron-containing compound, a phosphor-containing compound and a element-doped compound additive in a dispersing agent to form a sizing agent; dispersing a mixture of a pore-forming agent, a cladding agent and a stabilizer in a dispersing agent through ultrasound, then adding into the sizing agent and mixing to form a new sizing agent; carrying out a physical method or a chemical method on the new sizing agent to obtain a sizing agent with the primary particles in nano grade; carrying out spraying drying and granulating on the obtained sizing agent with the primary particles in nano scale to obtain a dry mixed material with secondary particles with spherical appearances; then carrying out a sintering process on the dry mixed material to obtain the product of the invention. The method has the advantages that besides that the primary particles reach the nano scale, the particle diameters are more uniform in distribution and more regular in appearance, an iron phosphate product synthesized from the material has the particle diameters with uniform distribution, and the material has favorable processability, good electric conductivity, excellent power multiplication performance and higher actual capacity.
Owner:秦波

Co3O4 nanometer material for supercapacitor and preparation method thereof

The invention discloses a Co3O4 nanometer material for a supercapacitor and a preparation method thereof. The method comprises the following steps: on the basis of using cobalt nitrate as a raw material and a mixture of ethylene glycol and water as a solvent, adding a defined amount of glucose, placing the mixture in an autoclave to react at 120-200 DEG C for 10-25 hours, performing suction filtering, drying at 80 DEG C, calcining in a muffle furnace at 300 DEG C to obtain Co3O4 sea urchin-shaped conjoined spheres which have the diameter of 7-15mu m and are of a three-dimensional hierarchical structure. The Co3O4 nanometer material and the preparation method have the characteristics that the operation method is simple, the yield is high, and the product has the three-dimensional hierarchical structure and superior electrochemical performance. The prepared Co3O4 spheres with the three-dimensional hierarchical structure have the characteristics that the stability is higher, the particle size distribution is uniform, the dispersibility is good, the spheres are difficult in agglomeration and pores with the three-dimensional structure are beneficial to the diffusion of the electrolyte, thus the material can be widely applied in the fields of catalysis, lithium batteries and supercapacitors.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY

Method for synthesizing ultrafine calcium carbonate by utilizing carbide slag

The invention relates to a method for synthesizing ultrafine calcium carbonate by utilizing carbide slag. The method comprises the following steps of: (1) dissolving carbide slag: uniformly mixing carbide slag with water in a ratio of (1:6)-(1:20) to ensure that the carbide slag is fully dissolved into a turbid liquid, wherein the water content of the carbide slag is 20-45%; (2) carrying out impregnation reaction: adding ammonium chloride into the turbid liquid of the carbide slag for uniformly mixing, wherein the mass ratio of carbide slag to ammonium chloride is (1:0.7)-(1:2.5), after the impregnation reaction is finished, filtering and removing the slag to obtain a clear calcium chloride solution; and (3) carrying out carbonization reaction: adding a crystal form control agent into a calcium chloride solution for fully dissolving, introducing CO2 into the solution to carry out carbonization reaction till the pH (potential of Hydrogen) value of the reaction solution is less than or equal to 7 to obtain ultrafine calcium carbonate slurry, wherein the crystal form control agent is one or more than two mixtures of sulfate, chloride, citrate, sodium dodecyl benzene sulfonate, pyrophosphate, oleic acid, ammonium citrate, N-methyl pyrrolidone and maleic acid.
Owner:SINOMA INT ENG +1

Magnetic mesoporous titanium dioxide core-shell type compound microsphere as well as preparation method and application thereof

The invention belongs to the technical field of functional material and particularly relates to a magnetic mesoporous titanium dioxide core-shell type compound microsphere as well as a preparation method and applications thereof. The core-shell type compound microsphere takes a ferroferric oxide nano particle cluster as the core and takes mesoporous titanium dioxide with high crystallinity as the shell. The preparation method comprises the following steps: firstly, preparing the ferroferric oxide nano particle cluster with stable citric acid, secondly, wrapping the surface of the cluster with an amorphous titanium dioxide shell through a sol-gel method, and finally, obtaining the magnetic mesoporous titanium dioxide core-shell type compound microsphere through hydro-thermal treatment. By being provided with the mesoporous titanium dioxide shell with high crystallinity, the compound microsphere has the characteristics of high selectivity, high enrichment capacity, high sensitivity and high recovery rate to phosphoeptide; and since a magnetic core exists, the microsphere enriched in phosphoeptide can be separated by magnetism quickly and very conveniently. The method provided by the invention has the advantages that the operation is simple, the process is controllable, and the prepared compound microsphere can be used for analyzing and identifying phosphoeptide with ultra low concentration in a biological sample.
Owner:FUDAN UNIV

Beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent and use thereof

InactiveCN102350312AUniform particle size distributionInternal mass transfer resistance is smallOther chemical processesWater contaminantsSolubilitySorbent
The invention provides a beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent. The beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent is prepared through a lay-by-lay assembling method. The beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent has good stability, good dissolvability and strong adsorption capability. The beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent has strong effects of adsorbing azo dyes such as methylene blue, methylene red and the like in waste water. The invention also provides a method for removing methylene blue in waste water. The method comprises the following steps of putting the beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent into an aqueous solution containing methylene blue, adjusting a pH value of the reaction system to a pH value of 7 to 8, carrying out ultrasonic dispersion for 0.5 to 1 hour, carrying out oscillation for 8 to 10 hours, and separating out precipitates by a permanent magnet. The method for removing methylene blue in waste water has the advantages of good adsorption effects, mild reaction, simple processes, simplification of solid-liquid separation, less secondary pollution and good feasibility for large-scale application.

Method for preparing porous carbon ball composite absorbing material loaded with magnetic metal element

The invention relates to a method for preparing a porous carbon ball composite absorbing material loaded with a magnetic metal element. The method includes the steps of 1] preparing a precursor solution containing magnetic metal ion salt; 2] placing porous carbon balls into the precursor solution for stirring and dipping; 3] filtering, then washing and drying the porous carbon balls; 4] calcining the dried porous carbon balls in an inert atmosphere; and 5] cooling to room temperature in the inert atmosphere and then obtaining a porous carbon ball composite absorbing material loaded with a magnetic metal element. The invention makes use of the high specific surface area and the strong adsorption of the porous carbon balls, introduces the precursor solution containing magnetic metal ion salt including cobalt salt, nickel salt and the like into channels of the carbon balls by capillary action, combines with hydrophilic oxygen-containing functional groups, and obtains the porous carbon ball composite absorbing material loaded with the magnetic metal element like cobalt or nickel through drying and sintering in the inert atmosphere. The whole preparation process is simple in technique, convenient to operate, and less demanding on production equipment.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI

Method for preparing load type high-dispersion multi-component precious metal nanoparticle catalyst

The invention relates to a method for preparing a load type high-dispersion multi-component precious metal nanoparticle catalyst. The method comprises the steps of 1) under inert atmosphere, uniformly stirring a solvent and a surface active agent, then adding a precious metal precursor solution, rising the temperature, reacting for a certain period of time, cooling to the room temperature, adding normal hexane, and performing extraction layering; 2) uniformly mixing the obtained upper layer nanoparticle solution with a carrier, and stirring or performing ultrasonic treatment; and 3) centrifugating, washing and drying or baking the mixed solution to obtain the catalyst. For the precious metal catalyst, even under a relatively high carrying amount, relatively good precious metal nanoparticle dispersion degree can be still guaranteed; the particle sizes of the particles are uniformly distributed; the precious metal carrying amount is controlled easily and accurately; the particle sizes and the components of multi-component particles can be controlled; and the catalysis application range is wide. The process is simple; the preparation cost is low; the applicability is high; and load-type high-dispersion precious metal and the multi-component precious metal nanoparticle catalyst can be prepared in a large scale.
Owner:TIANJIN POLYTECHNIC UNIV

Preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries

ActiveCN103066257ASolve the problem of complete oxidationPrevent "cation mixing" phenomenonCell electrodesLithium hydroxideOxygen
The invention provides a preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries. The method comprises: step 1, using a nickel-cobalt-aluminum precursor prepared through a coprecipitation method and doped with mixed ions as raw materials, putting the raw materials into a sealed hearth of a pressure furnace, continuously introducing oxygen until a fixed pressure value is formed, then heating to a pre-burning temperature and keeping warm for a period of time, and cooling to obtain an oxidized precursor; and step 2, adding measured lithium salt or lithium hydroxide into the oxidized precursor, ball milling and uniformly mixing; heating the uniformly mixed raw materials to a certain temperature and keeping warm for a period of time, and meanwhile continuously introducing oxygen to complete a sintering process, thereby obtaining the finish product. According to the invention, through a hyperbaric oxygen atmosphere, the oxygen are enabled to fully infiltrate into particles of the raw materials which has a certain accumulation thickness, thereby preventing situations that only surface materials are oxidized under a normal pressure, and ensuring a full conversion of Ni<2+> to Ni<3+> by a full pre-oxidation.
Owner:GUANGZHOU LIBODE NEW MATERIAL

Method for preparing nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe

ActiveCN104308181ANo obvious oxidation phenomenonGood dispersionNanotechnologySimple Organic CompoundsUltrasound - action
The invention discloses a method for preparing nanoscale zero-valent iron and nanoscale Cu/Fe particles. The method comprises the steps of dropwise adding KBH4 or NaBH4 aqueous solution into soluble ferrite aqueous solution under the condition of adopting ultrasonication and continuously stirring with nitrogen introduction, wherein the amount of substance ratio between KBH4 or NaBH4 and soluble ferrite substances is 2-4:1; continuously stirring after dripping, completely reacting to acquire nanoscale zero-valent iron particles; separating, washing and storing; adding CuSO4 or CuCl2 aqueous solution into the nanoscale zero-valent iron particles, wherein the amount of substance ratio between CuSO4 or CuCl2 and the soluble ferrite substances is 1:11-19; stirring and reacting to prepare nanoscale Cu/Fe particles. The high-dispersing type nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe prepared by the method can be used for simultaneously repairing chlorinated organic compounds, nitrate and heavy metal polluted water. The preparation method is simple, and rapid in speed; through the cavatition effect of ultrasonic wave, the dispersion is completely accelerated, and the agglomeration is reduced; the high-dispersing type nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe with smaller grain size, larger specific surface area and higher reactivity can be prepared.
Owner:浙江聚盾科技有限公司

Porous carbon in situ composite lithium iron phosphate cathode material and preparation method thereof

The invention, which belongs to the technical field of lithium ion battery cathode materials, discloses a porous carbon in situ composite lithium iron phosphate cathode material and a preparation method thereof. A synthetic process mainly comprises the following steps: dispersing porous carbon; compositing a precursor FePO4.2H2O/porous carbon, and synthesizing the product of the porous carbon in situ coating lithium iron phosphate cathode material. The porous carbon in situ composite lithium iron phosphate cathode material comprises 0.5 to 15 wt% of the porous carbon, 85 to 99.5 wt% of lithium iron phosphate, and 0 to 10 wt% of residual carbon obtained after organic carbon source pyrolysis. Most lithium iron phosphate particles are restricted in the inner of pores of carbon through in situ coating, so obtained composite cathode material particles have small diameters and a good uniformity. Carbon walls of porous carbon allow uniform coating of the lithium iron phosphate particles to be realized and simultaneously particle agglomeration to be largely reduced. The porous carbon in situ composite lithium iron phosphate cathode material has the advantages of good charge-discharge performance, stable circular property, rate capability, novelty, simple synthetic technology and easy large-scale production.
Owner:UNIV OF SCI & TECH BEIJING +1

Preparation method of spherical layer-structured anode material externally coated with nanocrystalline metal oxide for lithium ion battery

The invention belongs to the field of a lithium ion battery material, in particular relates to a preparation method of a spherical layer-structured anode material externally coated with a nanocrystalline metal oxide for a lithium ion battery. The layer-structured anode material has the following chemical formula: LiNixMnYCo<1-x-y)O2, wherein x is more than or equal to zero and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 0.5. The preparation method has the key points of: preparing the spherical layer-structured anode material by a coprecipitation method of carbonate; mixing a small amount of nanocrystalline metal oxide powder at a wet state, and stirring until a solvent is completely volatilized; and calcining a mixed material again, and obtaining the spherical layered material coated with the nanocrystalline metal oxide. The coating process is simple, the distribution of a coating layer is more uniform, product consistence is good, the prepared material is spherical particles with uniform grain sizes and has high tap density and volume energy density, and the cycle performance at high voltage, the high-temperature cycle performance and rate capability are enhanced and improved to some extent.
Owner:JIANGNAN UNIV
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