147results about How to "Crystallization intact" patented technology

The invention discloses a preparation method of a high-voltage lithium cobalt oxide cathode material which comprises the steps: (1) mixing cobaltosic oxide containing doped element M, a lithium source, oxide containing doped element M', a grain refiner and a fluxing agent to obtain a primary mixture; (2) sintering and smashing the primary mixture to obtain primary sintered powder; (3) mixing the primary sintered powder with a coating material to obtain a secondary mixture; (4) sintering and smashing the secondary mixture to obtain the lithium cobalt oxide cathode material. According to the preparation method disclosed by the invention, the problem of microscale segregation of distribution of doped elements in the product is solved by two modes of doped element premixing and dry-method mixing; a coulter type mixing technology is utilized to solve the problem of segregation of different matters in material mixing; the grain refiner and the fluxing agent are combined for use to synthesizea material in a mixed morphology; technologies such as dual effects of doped element surface crystallization catalysis and the coating material and the like are utilized; thus, performance of the high-voltage lithium cobalt oxide is obviously improved.

The invention discloses a method for preparing high-purity calcite calcium carbonate micropowder through shell hydro-thermal treatment and belongs to the field of inorganic materials. The method comprises the following process steps of: (1), grinding shells into powder and sieving the shell powder; (2), adding the shell powder to an alkali aqueous solution, and putting the mixture to a high-pressure kettle to carry out hydro-thermal treatment; and (3), separating, cleaning and drying the treated shell powder to obtain the high-purity calcite calcium carbonate micropowder, wherein the grain size of the powder is 0.5 micron to 2 microns. The method for preparing high-purity calcite calcium carbonate micro powder through shell hydro-thermal treatment disclosed by the invention has the characteristics of being low in material cost, simple in production process, environment-friendly and safe in production process; and besides, the method is suitable for large-scale high-value recycling of the waste shells.

The invention provides a coarse-grained hard alloy and a preparation method of the coarse-grained hard alloy, which mainly includes WC, Co accounting for 8.0 to 11.5 weight percent and TaC accounting for 0.4 to 0.6 weight percent; the average grain size of the WC in the coarse-grained hard alloy is 3.2 to 4.0Mu m, and the bending resistance strength is 2600 to 3100 MPa and the hardness Hv30 is 1100 to 1320. The preparation materials adopt the coarse-grained WC powder close to single crystal, with Fsss size 11.0 to 15.0Mu m and Hcp value 4.50 to 5.38 KA/m, TaC powder and Co powder; the vacuum sintering temperature is 1450 to 1520 DEG C, the ratio of TaC to Co is equal to to 0.045 to 0.055. The invention well matches the alloy strength and micro-harness, improves the over-all performance, thermal shock resistance and thermal plastic deformation resistance of the coarse-grained hard alloy.

The invention discloses a preparation method for carbon nano tube surface loaded magnetic alloy nano particle composite material, which belongs to the field of electromagnetic wave absorbing material preparation. The preparation method comprises the following steps: after purifying and activating a carbon nano tube, evenly dispersing the carbon nano tube to chloride salt solution of iron, cobalt and nickel, slowing adding an alkali solution dropwise into the solution in the fierce agitation process, and regulating the pH value of the solution and making iron ions, cobalt ions and nickel ions be coprecipitated onto the surface of the carbon nano pipe in the form of hydroxide according to the alloy proportion set when the solution is prepared; taking out a deposit by centrifugation or filtering; and after drying the deposit, carrying out the heat treatment of the deposit in the reducing atmosphere to obtain the carbon nano tube composite material loaded with magnetic alloy particles. The preparation method adopts a simple process. As no impurity element is introduced into the preparation process, the obtained magnetic alloy particles have high degree of crystallinity and excellent magnetic properties. In addition, the method has easy regulation of the alloy components. The composite material prepared by the method is significantly applied in the fields of electromagnetic interference resistance, stealth, microwave darkrooms, and the like.

The invention provides a sodium-ion battery anode material as well as a preparation method and application thereof. The anode material comprises doped prussian blue, wherein the prussian blue comprises a sodium element; the anode material is free of water. The preparation method of the anode material provided by the invention comprises the following steps: (1) mixing a solution A and a solution Bso as to obtain a suspension, wherein the solution A is a mixed solution of sodium ferrocyanide and sodium chloride; the solution B is a mixed solution of a doping source and a complexing agent; (2) performing solid-liquid separation on the suspension of the step (1), and collecting and drying a solid, thereby obtaining the anode material. The sodium-ion battery anode material provided by the invention has a univoltage platform, is excellent in charge and discharge property, is free of water and thus is particularly applicable to anodes of solid sodium ion batteries. The preparation method ofthe anode material provided by the invention is simple in process, low in cost and applicable to industrial application.

The invention discloses a method for preparing rose calcium carbonate from low-grade limestone, which comprises the following steps: 1) proportionally calcining low-grade limestone and blind coal to prepare calcium oxide; 2) screening under vibrations to remove coal ash and lime powder, thereby obtaining lumpy lime; 3) adding water to slake the lumpy lime, removing impurities by hydrocyclone and vibration screening to obtain fine emulsion slurry, adding a whitener, and aging to obtain the Ca(OH)2 prime slurry; 4) after regulating the temperature and concentration of the Ca(OH)2 prime slurry, adding a crystal form control agent, carrying out bubbling carbonation reaction, and adding a dispersant; when the pH value of the slurry is lower than or equal to 7, stopping carbonation to obtain a cured slurry; and 5) after the cured slurry is thickened, dehydrating to obtain the rose calcium carbonate. Compared with common light calcium carbonate, the rose calcium carbonate disclosed by the invention has the advantages of higher crystal completeness, high surface porosity, high light scattering coefficient and stronger covering power; and the invention is applicable to the industries of paper making, rubber, plastics and paint.

A preparation method of a high-stability high-purity extra-coarse tungsten carbide powder contains the following steps of: (1) grinding a high-purity extra-coarse tungsten carbide powdered raw material with its chemical purity being greater than or equal to 99.98 wt%, and carrying out size grading to obtain the required average granularity and a high-purity extra-coarse tungsten powder according to the particle size distribution; (2) carrying out carbon addition by the use of carbon black according to the total carbon content of the obtained tungsten carbide powder being 6.13+/-0.05%, followed by ball milling and mixing to obtain a ball-milling mixture; (3) filling the obtained ball-milling mixture into a graphite boat and a carbide furnace, and carrying out high-temperature carbonization at 1600-2500 DEGC for the carbonization time of 1-10 hours; and (4) carrying out coarse crushing on the obtained carbonized material, followed by grinding and crushing, and carrying out size grading to obtain the high-purity extra-coarse tungsten carbide powder. The method provided by the invention can be adopted to produce the high-purity extra-coarse tungsten carbide powder with good crush resistance, morphology and structure and excellent thermal stability. The high-purity extra-coarse tungsten carbide powder is used to prepare an extra-coarse crystal cemented carbide product with high performance.

A process for synthesizing nanometre BaFe12O19 powder includes such steps as proportionally mixing the inorganic salt (nitrate or carbonate) of Ba2+ or Fe3+, citric acid and chloride (potassium chloride, sodium chloride, or their combination in mol ratio of NaCl/KCl=1:0.5-1.5), microwave inducing, low-temp. combustion for 2-10 min, heat treating under 900 deg.c for 0.2-10 hr and water washing to obtain nanometre hexagonal crystal of BaFe12O19. Its advantages are simple process, low energy consumption, and regulatable magnetic performance of product.

The invention discloses phosphatizing liquid. The phosphatizing liquid comprises the following components in percentage by weight: 7 percent of starter liquid, 0.38 to 0.4 percent of neutralizer, 0.2 to 0.6 percent of accelerator and the balance of water, wherein the starter liquid comprises the following components in percentage by weight: 30 to 36 percent of 85 percent phosphoric acid, 16 to 20 percent of 68 percent nitric acid, 15.6 to 18.4 percent of 99.7 percent zinc oxide, 0.4 to 0.6 percent of citric acid, 0.4 percent of sodium fluoride, 0.6 to 1 percent of nickel nitrate, 0.16 to 0.24 percent of ferric nitrate, 0.004 to 0.01 percent of copper nitrate and the balance of water.

The invention discloses a substrate double-injection- hydrothermal modified method of high-dispersed magnesium hydroxide nanometer piece in the organic chemical technique domain, which is characterized by the following: adapting inorganic magnesium salt as raw material and inorganic alkaline as precipitant and inorganic chlorine salt as substrate solution; injecting the magnesium salt and inorganic chlorine salt solution at 10-80 deg.c; disposing the atmospheric product for 1-6 hours at 100-200 deg.c; improving the product structure through chlorine salt and hydrothermal environment to produce topographic regulation and good dispersion property magnesium hydroxide nanometer piece with 10-50nm even thickness, 30-300nm even diameter and 100 -600nm birdnesting particle size. The invention makes regular topographic, even grain size and good dispersing magnesium hydroxide nanometer piece, which is used in the plastic and rubber industry as high-property inorganic flame-proof brusque.

The invention discloses a nickel-cobalt composite oxide and a nickel-cobalt doped oxide. The molecular formula of the nickel-cobalt composite oxide can be represented by a general formula NixCo(3-x)O4+/-z, wherein x is more than or equal to 1.8 and less than or equal to 2.7, and z is more than or equal to 0 and less than or equal to 0.5; and the molecular formula of the nickel-cobalt doped oxide can be represented by a general formula NixCo(3-x-y)MyO4+/-z, wherein the x is more than or equal to 1.8 and less than or equal to 2.7, y is more than or equal to 0.03 and less than 0.3, and z is morethan or equal to 0 and less than or equal to 0.5. The invention also discloses a method for preparing the nickel-cobalt composite oxide and the nickel-cobalt doped oxide. The nickel-cobalt composite oxide and the nickel-cobalt doped oxide have the advantages of excellent sphericility degree, high density, complete crystal and good activity.

The invention discloses a method for synthesizing tobermorite whiskers by sodium silicate, comprising the following steps of: preparing sodium silicate and caustic alkali into solution with a certain concentration; dissolving a chlorine-containing compound and an aluminum-containing compound according to a certain silicon-chlorine mol ratio and a certain silicon-aluminum mol ratio; mixing the prepared solution and lime milk according to a certain calcium-silicon mol ratio, using a dynamic hydrothermal method to perform constant-temperature and constant-pressure reaction in a reaction kettle; after reaction; and cooling and filtering the product to obtain the tobermorite whiskers. The method has a simple process and low energy consumption, and the purity of the synthesized tobermorite whiskers is high; the tobermorite whiskers prepared by the invention is needle-like, have complete crystallization surfaces, and can be applied in fields such as the building material, the petrifaction, the ceramic, the biological material, and the like. The comprehensive recovery of high-alkalinity sodium silicate waste liquid produced during the industrial production can be achieved. The method is suitable for industrial application.

This invention involves an anisotropic cobalt ferrite magnetic nanoparticle for the preparation methods and devices, nano-magnetic material is a preparation of technical fields. The characteristics of the present invention are to co-precipitation - Preparation phase transformation process of nano-cobalt ferrite placed in a strong magnetic field in a reactor. Will ion containing cobalt and iron ions in the mixture solution by adding containers of sodium hydroxide precipitation, stirring mixture with magnetic stirrer, and 60 Deg.C to respond fully, cobalt hydroxide by ferric hydroxide precipitation and the suspension and then transfer its Xeon magnetic field reactor, the strong magnetic field of magnetic field intensity of 6 to 7 T, slurry temperature is 60 to 95 Deg.C, in strong magnetic field heat treatment two hours, then pumped filter isolated precipitation powder, The cobalt ferrite particles have excellent magnetic properties.

The invention discloses a preparation method for polishing liquid used alumina powder, relates to a preparation method for alumina, in particular to a preparation method for polishing liquid and polishing powder used for spherical alumina powder by liquid phase precipitation method. The preparation method is characterized by the preparation process thereof, comprising: adding urea and catalyst in 0.2-0.4M ammonium aluminum sulfate solution for carrying out reaction under the temperature of 60 to 80 DEG C till the precipitation appears; carrying out aging, and then filtering, washing, and drying so as to obtain the precursor of the alumina powder which is calcined for 2 to 6 hours at 1200 to 1600 DEG C; later calcined alumina is obtained; finally, by screening, spherical alumina which has integral crystallization, high purity (the alumina content reaches 99.5 percent), good mobility, and uniform particle diameter, and is suitable to be used for the polishing liquid is obtained.

The invention relates to a modified lithium titanate material used for a lithium ion battery and a manufacturing method thereof. The modified lithium titanate material is manufactured by the following steps through a molten-salt growth method: adopting a lithium source and a titanium source as raw materials and taking a molten salt as a fusing agent; doping a compound containing a magnesium element, an aluminum element, a neodymium element, a rubidium element, a gallium element, a cesium element, a silicon element, a tin element or a carbon element for modification; and grinding and calcining. The modified lithium titanate material has the advantages of nano particles, clear crystal structure and integral crystallization shape; the manufacturing method using the molten-salt growth method is used to ensure the homogeneity of products; and the electrical conductivity and cycle performance of the lithium ion battery with the modified lithium titanate cathode can be improved greatly.

The invention provides a preparation method of molybdenum boride powder. In the preparation steps, the molybdenum boride powder which completely accords with material design phase compositions can be controlled to be prepared by means of a high-temperature and high-pressure synthesis mode according to setting of the B/Mo mole ratio n (n=0.5, 1, 2, 2.5, 4) before synthesis, controllable synthesis of target molybdenum boride material phase compositions is achieved, and the synthesized molybdenum boride powder is uniform in particle size, complete in grain crystallization and excellent in property. The method is controllable in technological process, short in technological route, high in targeted property, convenient to operate, efficient, economical in energy, safe and good in reliability. The finished molybdenum boride powder is uniform in particle size distribution and complete in grain crystallization, the chemical purity is higher than or equal to 99.8%, and the product quality stability is good, the properties are obviously improved compared with a molybdenum boride material synthesized through a conventional method, and therefore the produced molybdenum boride material shows excellent physical and chemical properties in industrial application.

The invention relates to a heat-conductive and flame-retardant PET composite material and a preparation method thereof. The composite material comprises 80-100 parts of PET, 16-18 parts of a heat-conductive and flame-retardant boehmite composite filler, 1-3 parts of nanometer titanium dioxide, 0.2-0.4 part of a compatibilizer and 0.1-0.5 part of an antioxidant. The heat-conductive flame-retardantboehmite composite filler is used, and boehmite is a small white crystal, and has the characteristics of completeness in crystallization, fine crystal grains, few crystal structure defects and high thermal coefficient, so the heat conductivity of the PET composite material is improved; and the boehmite generates water and Al2O3 in the thermal decomposition process, the water can dilute flammable gas, and the Al2O3 solid covers the surface of a PET substrate to block and delay the burning rate, so the effects of flame retardant and smoke suppression are achieved.

The invention discloses a preparation method of KNbO3 nano solid solution with adjustable optical band gap. The preparation method is as follows: adding citric acid monohydrate into deionized water for completely dissolving, then adding basic nickel carbonate, heating and stirring to form a transparent solution A; adding niobium oxalates into the deionized water for completely dissolving to form a solution B; slowly adding dropwise the solution B into the solution A, fully stirring, successively dissolving anhydrous potassium carbonate and barium carbonate into a mixed solution of the solution A and the solution B for full reaction and stirring to form a transparent solution C; finally adding ethylene glycol, and fully stirring to form a solution D; heating the D solution for evaporation and promotion of citric acid and ethylene glycol esterification, drying to form a dark yellow solid precursor; grinding the precursor, and calcining in air atmosphere to eventually obtain the nano solid solution with the chemical formula of [KNbO3] 1-x [BaNi1 / 2Nb1 / 2O3-Delta] x. The product exhibits better photocatalytic effect in visible region.

The invention provides a preparation method of a three-dimensional TiO2 crystal film. The method comprises steps of: letting discharge gas in medium block discharge plasma reactor by employing a normal pressure low temperature radio frequency medium block glow discharge method; the discharge gas discharging to generate plasma jet by radio frequency alternating current; sending a precursor and carrying gas to a plasma zone to carry out reaction and precipitate on a substrate, so as to obtain the three-dimensional TiO2 crystal film. The method is characterized in that the precipitate is inner glow precipitate. The TiO2 obtained by the invention has a large proportion of {001} active surface and a unique three-dimensional structure forming by intersecting growth of a {101} surface, a {001} surface and a {101} surface; and the titanium dioxide film irradiates strong visible fluorescence by excitation of laser of 325 nm wavelength at room temperature.

The invention relates to rare-earth type lithium iron phosphate serving as the cathode material of a lithium secondary battery and a preparation method thereof. The rare-earth type lithium iron phosphate contains 100 mole fractions of lithium iron phosphate, 3.9-7.8 mole fractions of rare-earth alloy and 1.1-2.2 mole fractions of cellulose acetate. The preparation method of the rare-earth type lithium iron phosphate comprises the following steps of: putting an iron source compound, a lithium source compound, a phosphorus source compound and a rare-earth material into a powder mixer for powder mixing; in the powder mixing process, gradually spraying cellulose acetate dissolved in acetone to the mixed powder so that cellulose acetate is uniformly stuck on the mixture particles of the four materials, and drying; pre-sintering the dried mixture particles in an atmosphere furnace under inert gas protection; and carrying out heat preservation on the pre-sintered powder in the atmosphere furnace under inert gas protection to obtain the rare-earth type lithium iron phosphate. The rare-earth type lithium iron phosphate provided by the invention has the advantages of good conductive performance, relatively short preparation time and the like.