376 results about "Spinel group" patented technology

Intercalation compositions having spinel structures with crystallites of metal oxides (M2O3) dispersed throughout the structure are provided having the general formula Li1+xMyMn2-x-yO4. Methods of producing the intercalation compositions and rechargeable lithium batteries containing the compositions are also provided.

Synthesis process for new particles of Li4Ti5O12, Li(4-alpha)ZalphaTi5O12 or Li4ZbetaTi(5-beta)O12, preferably having a spinel structure, wherein beta is greater than 0 and less than or equal to 0.5 (preferably having a spinel structure), alpha representing a number greater than zero and less than or equal to 0.33, Z representing a source of at least one metal, preferably chosen from the group made up of Mg, Nb, Al, Zr, Ni, Co. These particles coated with a layer of carbon notably exhibit electrochemical properties that are particularly interesting as components of anodes and/or cathodes in electrochemical generators.

The invention relates to a spinel nickel manganese acid lithium and layered lithium-rich manganese-based composite cathode material with a core-shell structure and a preparation method thereof, which belongs to the technical field of material synthesis. The prepared lithium ion composite cathode material takes a layered lithium-rich manganese-based Li[Lia(NixCoyMnz)]O2 as a core material, takes spinel nickel manganese acid lithium LiNi0.5Mn1.5O4 as a shell material; a coprecipitation method is employed to obtain a core-shell precursor, the core-shell precursor and the lithium source are uniformly mixed and calcined to obtain the spinel nickel manganese acid lithium and layered lithium-rich manganese-based composite cathode material with the core-shell structure. According to the invention, the layered lithium-rich manganese-based is taken as the core material, and the spinel nickel manganese acid lithium is taken as the shell material; under the prerequisite that material gram capacity is kept, material structural stability is increased, material cycle, multiplying power and safety performances are improved, function composite and complementation of the core material and the shell layer material can be realized, and the problem that high capacity and high security can not be achieved simultaneously is solved. The composite cathode material has the advantages of simple process and obviously increased performance.

The present invention relates to dry refractory compositions having excellent thermal insulation values. The dry refractory composition also has excellent resistance to molten metal and slag. The composition comprises a lightweight filler material selected from the group consisting of perlite, vermiculite, expanded shale, expanded fire clay, expanded silica-alumina hollow spheres, vesicular alumina, sintered porous alumina, alumina spinel Stone insulating aggregate, ettringite insulating aggregate, expanded mullite, cordierite and anorthite, and a matrix material selected from the group consisting of calcined alumina, fused alumina, sintered magnesia, fused magnesia, Silicon fume, fused silica, corundum, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, sialonite, titanium dioxide, barium sulfate, zircon, sillimanite Group of minerals, pyrophyllite, fire clay, carbon and calcium fluoride. The composition may also contain dense refractory aggregates selected from the group consisting of calcined clay, calcined clinker, minerals of the sillimanite group, calcined bauxite, pyrophyllite, silica, zircon, baddeleyite, cordierite , corundum, sintered alumina, fused alumina, fused quartz, sintered mullite, fused mullite, fused zirconia, sintered zirconia mullite, fused zirconia mullite, sintered magnesia, Fused magnesia, sintered spinel and fused spinel refractory clinker. The composition also contains a heat activated binder and a dust suppressant.

The invention discloses a preparation method of a spinel-type magnetic MFe2O4/graphene composite material. The preparation method utilizes a water-soluble metal M<2+> salt and a Fe<3+> salt as precursors and graphite oxide as a matrix and comprises the following steps of carrying out ultrasonic dispersion of graphite oxide in ethanol or water as a solvent to obtain a graphene oxide dispersion, adding a M<2+> salt and Fe<3+> salt-containing aqueous solution having a M<2+>/Fe<3+> mole ratio of 1: 2 into the graphene oxide dispersion, fully stirring to obtain a mixed solution, adjusting a pH value of the mixed solution to a value more than 10 by an alkali liquor, adding a reducing agent into the mixed solution, stirring at a temperature of 80 to 150 DEG C for a reaction lasting for 4 to 10 hours, after the reaction is finished, carrying out separation, washing, drying and grinding, and carrying out calcination of the grinded powder at a temperature of 300 DEG C in a nitrogen or argon atmosphere for 2 to 10 hours. Magnetic MFe2O4 nano particles of the spinel-type magnetic MFe2O4/graphene composite material have high loading capacity, stable structures, good uniformity, good dispersibility and strong adhesion with graphene. The spinel-type magnetic MFe2O4/graphene composite material can be widely used in the fields of magnetic targeting materials and other related function materials.

The invention relates to an Al2O3-MA-SiC-C refractory castable material with carbon wrapped by nano Al2O3-SiC film or nano Al2O3-MgO film, and a preparation method thereof. The preparation method of the nano carbon-containing castable material comprises: preparing carbon-containing sol suspension with Al(OH)3-SiC or Al(OH)3-Mg(OH)2 through a high-speed impact mixer, coating the carbon-containing sol suspension on the surface of carbon powder to form a compact carbon wrapping layer with complete coverage and no crack, and carrying in-situ synthesis of nano gel particles of Al2O3 and SiC or Al2O3 and MgO generated during transformation from sol to gel so as to generate a nano-sized matrix with carbon-containing nano secondary spinellite, Al2O3 and SiC as main crystalline phases, thereby completing the preparation of the Al2O3-MA-SiC-C refractory castable material made of nano material. The castable material has particularly excellent resistance against erosion and scouring of molten iron slag, and can satisfy the requirements for use in the iron tapping channel of the modern large-scale blast furnace. Moreover, the invention significantly prolongs the service life, reduces the cost and facilitates the environmental protection.

The invention relates to a high-performance magnesium-aluminum-chromium composite spinel brick for RH refining furnace dip pipes and non-ferrous smelting furnaces. The high-performance magnesium-aluminum-chromium composite spinel brick is characterized by comprising the following raw materials: 14.0-20.0 parts of low-chromium fused magnesium chromium sand (6-8% of Cr2O3, at least 78% of MgO), 71.6-82.0 parts of high-purity fused magnesite, 2.0-4.4 parts of nano Cr2O3 powder, 2.0-4.0 parts of uf-Al2O3 micropowder and 2-4 parts of binder. The manufacturing method comprises the following steps: mixing, molding, drying, firing and the like. The magnesium-aluminum-chromium composite spinel brick provided by the invention has the advantages of high sintering tendency, high crystal compactness, low porosity (at most 10%), high compressive strength (at least 100 MPa), high thermal shock stability (at least 18 times by 1100 DEG C water cooling) and the like. The Cr2O3 content of the product isat most 6%, thereby reducing the Cr2O3 content in the brick, lowering the production cost and finally effectively reducing the environmental pollution of waste magnesium-chromium bricks after use.

The invention relates to a zirconium oxide composite ceramic and a preparation method thereof. The zirconium oxide composite ceramic is prepared from, by mass, 65%-80% of a zirconium oxide matrix, 10%-30% of a conducting material and 2%-11% of a nanometer reinforcing material; the conducting material is selected from at least one of a non-ferrous metal oxide, a white metal oxide, a compound with a titanium structure and a compound with a spinel structure, wherein the non-ferrous metal oxide is selected from at least one of CuO, Cu2O, V2O5, NiO, MnO, MnO2, CoO, Co2O3, Co3O4, Fe2O3, FeO, Fe3O4 and Cr2O3, and the white oxide is selected from at least one of ZnO, SnO2 and TiO2; the compound with the titanium structure is selected from at least one of CaTiO3, BaTiO3, LaCrO3, LaSr(0.1)Cr(0.9)O3, SrTiO3 and LaFeO3, and the structural formula of the compound with the spinel structure is AB2O4, wherein A is selected from at least one of Mg, Fe, Zn and Mn, and B is selected from at least one of Al, Cr and Fe. The zirconium oxide composite ceramic is excellent in antistatic property and high in mechanical property.

The invention relates to a preparation method of three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres, and relates to the technical field of multi-level structured nano-grade catalyst materials. First, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are adopted as a nickel source and a cobalt source, a deionized water-isopropanol mixed phase with a proper proportion is adopted as a solvent, methanol is adopted as a reactant, and no additional base precipitating agent is adopted; a three-dimensional flower-shaped nano-sheet microsphere precursor is prepared in a Ni<2+>-Co<2+>-NH3-NH4<+>-SG<n->-H2O-IPA-CH3OH system (SG<n-> is CO3<2-> or HCOO<->); the temperature is increased to 300-400 DEG C in an air atmosphere with a speed of 1 DEG C/min, and the precursor is calcined for 2-3h, such that the three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are obtained. According to the invention, co-precipitation of the formulated cobalt and nickel in the raw materials is realized. The prepared three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are spinel cubic phases with high purity, and are formed by ultrathin nano-sheet self-assembly. The microspheres comprise rich mesopores, and have a large specific surface area. The method has the advantages of simple operation, appropriate conditions and easy control.

Disclosed are glass-ceramics having predominantly Spinel-group crystal phases and methods of making the glass-ceramics. Disclosed are glass-ceramics harder than 10 GPa (Vickers) and methods of making the glass-ceramic. Disclosed are articles of manufacture made of the glass-ceramics. Disclosed is the use of the glass-ceramics in armor and related applications.

The invention relates to a catalyst for decomposing nitrous oxide, which is [1] a catalyst comprising a support having supported thereon aluminum, magnesium and rhodium, [2] a catalyst comprising an alumina support having supported thereon magnesium and rhodium, [3] a catalyst comprising a support having supported thereon rhodium, the support comprising a spinel crystalline composite oxide formed by magnesium and at least a part of aluminum, [4] a catalyst comprising a support having supported thereon aluminum, rhodium and at least one metal selected from zinc, iron, manganese and nickel, [5] a catalyst comprising an alumina support having supported thereon rhodium and at least one metal selected from zinc, iron, manganese and nickel, or [6] a catalyst comprising a support having supported thereon rhodium, the support comprising a spinel crystalline composite oxide formed by at least a part of aluminum and the at least one metal selected from zinc, iron, manganese and nickel. The catalyst is not easily deteriorated in the activity due to moisture, favored with low-temperature decomposition activity and capable of reducing the amount of NOx generated to the allowable concentration or less. The invention also relates to a process for producing the catalyst and to a method for decomposing nitrous oxide.

The invention provides a ferrite/metal oxide material and a preparation method and application thereof. The ferrite/metal oxide material is a composite material of ferrite or ferrite-metal oxide, wherein the ferrite is of a spinel structure, a formula is MFe2O4, the metal oxide is one or more of Fe2O3 and metal M oxides, and M is one or more of Zn, Co, Mn, Cu and Ni. The preparation method comprises the steps that an iron precursor and a metal M precursor are dissolved in an organic solvent, and heating and stirring are performed; an aqueous hydrogen peroxide solution is added, stirring continues to obtain sol, and drying is performed under the condition of 120-150 DEG C; under a nitrogen or air atmosphere, calcination is performed at the temperature of 200-900 DEG C for 4-6 hours to obtain the ferrite/metal oxide material. The obtained product is small in particle size and controllable in composition, the preparation method is simple in process, and the ferrite/metal oxide material has a very good effect when serving as a catalyst to activate PMS and degrade organic pollutants in light-like fenton reaction and has an industrial application prospect.

The invention brings forward a preparation method of mesoporous nickel cobaltate fiber. According to the preparation method, an organic solvent is added during the preparation process of a precursor; a mixed phase of a water phase and an organic phase is used as a solvent, soluble nickel salt and cobalt salt are used as raw materials, and oxalate is used as a precipitating agent; in a system of Ni<2+>-Co<2+>-NH3-NH4<+>-SG<n->-C2O4<2->-H20-C2H5OH, a fibrous precursor is prepared; and the fibrous precursor is subjected to thermal decomposition in the air atmosphere at 250-400 DEG C so as to obtain the mesoporous NiCo2O4 fiber. According to the invention, coprecipitation based on the Ni-Co ratio set in the raw materials is effectively realized. The prepared NiCo2O4 powder is a cubic phase, has high purity and large specific surface area, is fibrous and porous, and is applicable to be used as a catalyst or an alkaline solution oxygen-evolution/hydrogen-evolution electrode material or direct alcohol fuel cell anode catalyst. The method provided by the invention is simple to operate and easy to control, has advantages of mild condition and low cost, and is suitable for commercialized production.

The invention discloses a composite spinel-zirconium refractory material for smelting colored heavy metal. The technical scheme is as follows: the material comprises 30-45 parts of 5mm-0mm emery, 10-30 parts of 5mm-0mm magnesia chromite clinker,15-25 parts of 3mm-1mm magnalium spinel clinker, 7-20 parts of 3mm-0mm magnesite clinker, 1-5 parts of chrome green less than or equal to 0.045mm and 2-8 parts of zirconium dioxide less than or equal to 0.045mm by weight part and a bonding agent is aluminium dihydrogen phosphate liquid the adding amount of which is 3-15% of the total weight of the emery, the magnesia chromite clinker, the magnalium spinel clinker, the magnesite clinker, the chrome green and the zirconium dioxide. A hydraulic press is adopted for molding and the composite spinel-zirconium refractory material is sintered by a hyperthermia tunnel kiln. The content of Cr2O3 of the composite spinel-zirconium refractory material is less than 10%, so that the composite spinel-zirconium refractory material not only is environment-friendly, but also has better slag erosion resistance, high-temperature melt washing resistance, metal melt permeation resistance and thermal shock stability performance.

An oxide sintered body including In (indium element), Ga (gallium element) and Zn (zinc element), having a total content of In, Ga and Zn relative to total elements except for an oxygen element of 95 at % or more, and including a compound having a bixbyite structure represented by In₂O₃ and a compound having a spinel structure represented by ZnGa₂O₄.

The invention belongs to the technical field of adsorption materials, and discloses a biochar, iron and manganese spinel composite material for adsorbing heavy metal antimony and cadmium. Solution B is dripped into suspension A at the constant speed, the solution B and the suspension A are stirred for 2.5-3.5 hours and are centrifuged, washed and dried to obtain the biochar, iron and manganese spinel composite material. The solution B is potassium permanganate solution with the concentration of 0.1 mol/L, and the suspension A comprises water, ferrous sulfate heptahydrate and from tea leaf and branch biochar according to a weight ratio of 100:(8.0-8.5):(0.8-1.2). The biochar, iron and manganese spinel composite material has the advantages that the biochar, iron and manganese spinel composite material has a large specific surface area and is large in porosity and favorable for adsorbing the heavy metal; adsorption environments are mild, and the heavy metal can be efficiently adsorbed in neutral and slightly weakly acidic environments; excellent adsorbing and removing effects can be realized by the biochar, iron and manganese spinel composite material for single heavy metal environments, and excellent heavy metal adsorbing and removing effects also can be realized by the biochar, iron and manganese spinel composite material for heavy metal antimony and cadmium co-existence environments.

The invention discloses a non-phosphorus and low-carbon alumina-magnesia unburned brick for a stainless steel ladle and a manufacturing method of the brick. The non-phosphorus and low-carbon alumina-magnesia unburned brick comprises the following components by mass percentage: 15-20% of 5-3mm bauxite, 20-25% of 3-1mm bauxite, 10-15% of bauxite less than or equal to 1mm in particle size, 10-15% of 3-1mm fused magnesite, 5-10% of fused magnesite less than or equal to 1mm in particle size, 10-15% of emery powder, 15-20% of spinel powder, 2-5% of aluminum oxide micropowder less than or equal to 25 micrometers, 0.1-2% of silicon carbide additive, 0.1-2% of wetting agent and a phenolic resin binding agent. Compared with the prior art, the brick and the method have the prominent advantages that a burning technology in the conventional method is omitted, energy sources are saved, the brick is free from phosphorus; aluminum and magnesium perform spinel reaction at the high temperature; and the brick is subjected to machine molding in the absence of the phosphorus, has higher density, avoids pollution of molten stainless steel, and has a longer service life.

Disclosed is a sputtering target which is characterized by being a sintered body of an oxide which contains at least indium, tin and zinc and includes a spinel structure compound expressed as Zn2SnO4 and a bixbite structure compound expressed as In2O3. Also disclosed is a sputtering target which is characterized in that it contains indium, tin, zinc and oxygen and only a peak ascribed to a bixbite structure compound is practically observed by x-ray diffraction (XRD).

The invention relates to a magnesium aluminate spinel light refractory castable and a production method thereof. According to the magnesium aluminate spinel light refractory castable and the production method thereof, the purpose of improving the porosity of the refractory castable is achieved by using magnesium aluminate spinel light aggregate and introducing air bubbles during the production of the castable. According to the magnesium aluminate spinel light refractory castable and the production method thereof, a foaming method and castable are combined, not only is the characteristic of large raw critical particle size in the castable ensured but also the porosity of the castable is improved. According to the magnesium aluminate spinel light refractory castable and the production method thereof, 50-65 wt% of light magnesium aluminate spinel particles which serve as the aggregate and 10-15 wt% of sintered magnesium aluminate spinel fine powder, 10-15 wt% of aluminum oxide micro powder and one of 15-20 wt% of pure calcium aluminate cement or hydrated alumina which serve as the matrix are mixed; and a water reducing agent, a foaming agent and a foam stabilizer are added. The magnesium aluminate spinel light refractory castable produced according to the method provided by the invention has high porosity, low thermal conductivity and good thermal shock resistance, and the serviceability temperature reaches 1700 DEG C.

The utility model provides a MnZn ferrite material with high saturation magnetic flux density and low power consumption, which improves the saturation magnetic flux density (Bs) and keeps the power consumption at a low level simultaneously. The material is a spinel polycrystalline structure and comprises the main compositions (calculated by the content of oxide) of 53.5-54.8mol% of Fe2O3, 38.5-44.5mol% of MnO, and 1.5-7.5mol% of ZnO; furthermore, the material also comprises SiO2 and CaO that are taken as a first auxiliary composition, comprises Nb2O5, Ta2O5, V2O5, ZrO2 and HfO2, wherein one or two combinations are taken as a second auxiliary composition, also comprises TiO2 and SnO2, wherein one or two combinations are taken as a third auxiliary composition, and also comprises CoO which is taken as a fourth auxiliary composition.

The invention discloses an improved preparation method of a large single crystal layered positive electrode material for a lithium ion battery. The method comprises the following steps of firstly mixing Co-Mn precursors with a lithium source, wherein the mol ratio of the lithium element to the transition metal element is between 0 and 1; high-temperature calcination is performed; at the moment, a spinel phase is formed due to insufficiency of the lithium element; the spinel phase is favorable for the fusion and the growth of the primary crystal grains; micrometer stage large-dimension composite phase primary crystal grains or pure phase primary crystal grains are obtained; then, a lithium source and a nickel source at the chemical metering ratio are supplemented into the prepared primary crystal grains, so that the mol ratio of the nickel element to the cobalt element to the manganese element Ni/Co/Mn is (1-x-y)/x/y; the mol ratio of the lithium element to the transition metal element Li/Ni-Co-Mn is (1+z)/(1-z) to (1+z)/(1-z)+0.05; in the high-temperature calcination, the solid phase reaction is initiated by the diffusion of lithium ions and nickel ions; the large single crystal layered positive material for the lithium ion battery is obtained.

The invention discloses magnetic spinel-structure ferrite nano-particles and a preparation method thereof, which pertains to the field of magnetic nano-materials and aims at solving the problem that in the prior art, the defects of high production cost, low yield, environmental pollution, complicated operations, inadaptability to the commercial production and the like exist. The molecular formula of the magnetic spinel-structure ferrite nano-particles is CoxCuyZnzFe3-x-y-zO4, wherein, x ranges from 0 to 1, y ranges from 0 to 1 and z ranges from 0 to 1; and the magnetic spinel-structure ferrite nano-particles have the diameter of 20nm to 400nm and take the shapes of a ball, a regular tetrahedron, a regular hexahedron, a regular octahedron or a stick. The preparation method comprises the steps that: a soluble salt solution plated with transition metal ions is mixed with an alkali metal-hydroxide solution according to the volume ratio of 16:1-8 so as to carry out hydrothermal treatment, with the hydrothermal temperature of 120 DEG C to 180 DEG C and the hydrothermal time of 2 hours to 6 hours. The preparation method has the advantages of low cost, simple processes, strong applicability, adaptability to the industrialized production, and the like.

The invention discloses a preparation method of a lithium-enriched anode material with a nano-grade lamellar-spinel composite structure. The molecular formula of the lithium-enriched anode material with the nano-grade lamellar-spinel composite structure is X(Li2MnO3.LiMn0.5Ni0.5O2)-YLiMn1.5Ni0.5O4; a preparation process comprises the following steps of: preparing a mixed solution of manganese sulfate, nickel sulfate and ammonium persulfate and a lithium hydroxide solution; mixing the two solutions according to a volume ratio to prepare a mixed solution of a precursor; adding the mixed solution of the precursor into a hydrothermal reaction kettle to react; calcining and grinding to prepare the lithium-enriched anode material with the nano-grade lamellar-spinel composite structure. Compared with a co-precipitation method, the preparation method disclosed by the invention has the characteristics of simple process, easiness of controlling, low cost, environmental friendliness and better repeatability, and is more suitable for large-scale production. The lithium-enriched anode material with the nano-grade lamellar-spinel composite structure prepared by the method disclosed by the invention is small in grain diameter, and has good electrochemical performances.