56results about How to "Eliminate reunion" patented technology

The invention belongs to the powder preparation field adopting powder metallurgy, and relates to a preparation method of submicron nearly spherical tungsten powder. The method comprises the following steps of: (1) pyrolyzing commercial ammonium paratungstate to obtain ammonium metatungsten; (2) dissolving the ammonium metatungsten in ammonia water; (3) filtering to obtain an ammonium tungstate solution; (4) adding a dispersant in the ammonium tungstate solution to mix evenly; (5) adding a precipitator while stirring to obtain tungstic acid sol; (6) performing vacuum filtration to obtain tungstic acid gel; (7) performing common drying or freeze drying; (8) crushing; (9) pyrolyzing to obtain tungsten trioxide; (10) performing ball milling; and (11) performing hydrogen reduction to obtain the submicron nearly spherical tungsten powder. By adopting the preparation method, the submicron nearly spherical tungsten powder can be prepared stably; and the technology is simple, the cost is lower, and mass production can be realized.

The invention relates to a method for preparing bismuth oxide nano powder by novel chemical liquid phase precipitation, reversely titrating bismuth nitrate into excessive basic alcohol-water solution and obtaining deposit, then washing with deionized water, dispersing and extracting with anhydrous alcohol; then drying and burning and making highly pure and ultrafine bismuth oxide powder. And it has good dispersivity, grain size of 30 nm about, and its crystal phase is a single alpha phase.

The invention relates to a method to produce the composite zirconia nano powder. It is to make the ZrO2-HfO2-Y2O3-Sc2O3 nano powder in the alcohol-water solution by the method of sol-gel. The invention controls the addition of the metal ion and the PEG 6000 and adjusts the pH by adding the ammonia the process includes the sol-gel, the de-ionized water washing, the absolute ethyl alcohol filtration, drying and calcinations. The average particle diameter is 15nm.

The invention relates to a preparation method of an ammonium polyphosphate cladded microsphere flame retardant. The preparation method comprises the following steps: carrying out silylation modification on the CMSs by taking CMSs (Carbon Microspheres) as a carbon source and APP as an acid source and a gas source; dissolving the APP in hot water to prepare a suspension solution; mixing the APP suspension solution with a silylation modified CMSs dispersion solution and carrying out refluxing reaction; and cladding the silylation modified CMSs through the APP to prepare the CMSs-APP flame retardant. The flame retardant prepared by the method is used for preparing a flame-retarding PET (Polyethylene Terephthalate) composite material so that the flame-retarding performance of PET can be improved and the worsening, caused by the flame retardant, of mechanical properties of a PET matrix can be reduced to the greatest extent.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a preparation method of a metal oxide composite magnesium hydride hydrogen storage material. Themethod comprises the steps that magnesium hydride serves as a base material, metal oxide particles are mixed, the mass percentage content of metal oxide in the mixture is 1%-8%, and the mixture is subjected to hydrogen filling ball milling in a ball mill to obtain the metal oxide composite magnesium hydride hydrogen storage material. By adding the nanoscale metal oxide particles, the hydrogenation speed of the magnesium-based composite powder in the hydrogen charging ball milling process can be increased, and reduction of the particle size of magnesium hydride is facilitated; the nanocrystalline MgH2 is coated with the metal oxide to form a core-shell structure with an excellent synergistic effect, the core-shell structure has a good catalytic effect and remarkable dynamic performance, the hydrogen storage reaction speed can be improved, microcell heat release can be controlled, agglomeration of a hydrogen storage reactant Mg (OH) 2 can be effectively eliminated through the metal oxide, and the hydrogen storage efficiency is improved. Therefore, the purpose of sufficient hydrolysis reaction is achieved.

The invention relates to a nanoparticle surface modification method, comprising following steps: the nanoparticle is processed by SOCl2, and is reacted with tert-butyl hydrogen peroxide (TBHP) to form into a peroxide solicitation radical; the free radical polymerization reaction is transferred by reverse atomy which is triggered through the surface, and the polymerization of the cinnamene monomer is triggered by the free radical polymerization reaction; thereby the nanometer compound particle which is enwrapped by the graft polystyrene on the surface of the nanoparticle is prepared. Due to the active compound particle at the end of the outer-layer polymer of the nanometer compound particle composed through the free radical polymerization reaction of reverse atomy transfer triggered by the surface, the active compound particle can be used as giant molecule evocating agent to trigger the methacrylic acid methyl ester monomer to implement free radical polymerization transfer through the atomy on the surface; after the two surface solicitation polymerizations, the nanometer compound particle which is enwrapped by the methacrylic acid methyl ester is prepared. The invention has the advantages that: a good organic and inorganic nanometer compound material can be prepared through the surface solicitation polymerization reactions, and the nanoparticle surface is modified successfully, and the dispersivity and stability of the nanoparticle can be improved.

The invention discloses a lanthanum or yttrium doped aluminum zinc oxide powder and codeposition-supercritical fluid drying method for preparing the same which comprises, washing the precipitate synthesized through liquid phase co-precipitation with deionized water and ethanol, carrying out shrinkage-proof drying with ethanol dissolvent, thus the prepared powder has compact crystalline structure.

The invention discloses a method for removing heavy metal cadmium in shellfish enzymatic hydrolysate. The method includes the following steps of firstly, preparing Fe3O4 magnetic nanoparticles; secondly, preparing SiO2 core-shell magnetic microspheres; thirdly, preparing polyaspartic acid modified chitosan; fourthly, preparing composite aerogel; fifthly, processing the shellfish enzymatic hydrolysate; sixthly, removing cadmium. The heavy metal cadmium in the shellfish enzymatic hydrolysate is removed through the composite aerogel in cooperation with ultrasonic adsorption, operation is simple,the method has the advantages that the pH application range is wide, the cadmium removal effect and removal efficiency are high and separation is convenient, and the method has industrialized application prospects.

The invention provides a bottom blowing reduction device. The bottom blowing reduction device comprises a furnace body, a feed port, a discharge port, a reduction gas inlet and a reduction gas outlet;the furnace body is transversely arranged, and forms a certain included angle with the horizontal direction; in the length direction of the furnace body, a gas cavity and a material cavity are formedin the furnace body; the gas cavity and the material cavity are separated by a porous plate; the feed port is formed in one higher end of the furnace body; and the reduction gas inlet and the reduction gas outlet both communicate with the gas cavity. The invention further provides a method for bottom blowing reduction by using the device; and materials to be reduced are fed in the material cavityfrom the feed port, slowly move downwards along the inclined furnace body under coaction of the gravity and the reduction gas, and are finally reduced and output from the discharge port. The method has no need to use a push rod or a conveying belt for driving a boat container to move, so that the boat container and a conveying device are omitted.

The invention relates to the technical field of lithium battery production, and provides a lithium battery slurry defoaming and grinding method and device. The lithium battery slurry defoaming and grinding device comprises a tank body and a cover body, wherein an accommodating cavity for storing lithium battery slurry is formed in the tank body; the cover body is arranged at the open end of the tank body in a sealing and covering manner; a vacuumizing opening and a stirring and grinding mechanism are arranged on the cover body; the vacuumizing opening is communicated with the accommodating cavity; and the stirring and grinding mechanism extends into the accommodating cavity and is used for stirring and grinding the lithium battery slurry in the accommodating cavity. The lithium battery slurry defoaming and grinding method comprises the following steps: vacuumizing the accommodating cavity filled with the lithium battery slurry in real time through the vacuumizing opening; stirring andgrinding the lithium battery slurry in the accommodating cavity through the stirring and grinding mechanism. According to the embodiment of the invention, the lithium battery slurry is defoamed and ground simultaneously.

The invention provides silicon-carbon negative electrode material slurry and a preparation method thereof. The method comprises steps of 1) dividing CMC glue solution into two parts, and mixing a first part of the CMC glue solution with conductive agent and a silicon carbon material to obtain slurry 1; 2) adding a graphite material into the slurry 1, and dispersing the material to obtain slurry 2;3) adding a second part of CMC glue solution and the water into the slurry 2, vacuumizing, and dispersing the material to obtain slurry 3; and 4) adding SBR binder into the slurry 3, dispersing, sieving the slurry, and discharging bubbles to obtain silicon-carbon negative electrode material slurry. The method is advantaged in that the agglomeration phenomenon of the silicon-carbon particles in the pulping process is eliminated, that the graphite material uniformly wraps the silicon-carbon particles is guaranteed, and the overall cycle life of a battery is improved.

The invention discloses a method for preparing a transmission electron microscopy sample of biomimetically synthesized magnetic ferritin nanoparticles. The method comprises the following steps: mixinga buffer solution of the biomimetically synthesized magnetic ferritin nanoparticles with deionized water, and diluting to an appropriate concentration; ultrasonically shaking the mixed liquid in a cold bath to obtain a fully mixed sample suspension; performing anti-static dust removal treatment on an ultra-thin carbon film grid; wetting the ultra-thin carbon film grid; placing the treated ultra-thin carbon film grid on clean filter paper, and titrating the sample suspension on the surface of the filter paper; drying the ultra-thin carbon film grid carrying the sample suspension; and after thesample is completely dried, taking the sample out to obtain a magnetic ferritin nanoparticle transmission electron microscopy sample. Through adoption of the method, the problems of difficulty and low efficiency in preparation of the transmission electron microscopy sample of the magnetic ferritin nanoparticles and unclean back bottom of the ultra-thin carbon film grid can be solved, and the intrinsic monodisperse state of the sample can be presented well.

The invention discloses a reaction process for precipitating white carbon black through a stirring and milling method. Water glass is reacted with acid; and the reaction process comprises a reaction procedure and a curing procedure, wherein the reaction procedure is carried out in an acid and water neutralization stirred tank, and ceramic ball milling bodies are added into the acid and water neutralization stirred tank. In the reaction process, the stirring efficiency is greatly improved, and the generation of 'white spots' is radically stopped; moreover, the grain size is obviously reduced, so that the water glass with higher concentration can be reacted with the acid.