182 results about "Spinel" patented technology

The present application relates to the technical field of glass-ceramics, in particular to a lithium-free transparent spinel glass-ceramics, a preparation method and application thereof. The lithium-free transparent spinel glass-ceramics is obtained by heat treatment of a base glass, and spinel crystal is the main crystal phase. The composition of the glass-ceramics contains the following oxides in mol%: SiO2 38.00-48.00%, Al2O3 25.50-30.00%, ZrO2 3.00-5.00%, MgO 5.00-8.00%, ZnO 8.00-14.00%, Na2O 7.20-14.00%, B2O3 3.00-8.00%, K2O 0-2.00%, and Y2O3 0-1.00%, and basically no Li2O. The glass-ceramics of the present application does not use high-cost lithium, and can obtain excellent surface and deep stress characteristics and excellent drop impact resistance through chemical strengthening.

The invention discloses a porous ceramic filter for liquid magnesium alloy purification and a preparation method thereof, and the porous ceramic filter comprises the following raw materials in percentage by mass: 70-85wt% of ceramic particles, 8-15wt% of multi-element oxide system microcrystalline glass brazing filler metal and the balance of a binder, al2O3-B2O3-SiO2-MgO-CaO multi-element oxide system microcrystalline glass brazing filler metal is adopted, under the condition of air atmosphere high-temperature calcination, a compact reaction layer containing a low-melting-point glass phase, an aluminum oxide phase, a magnesium aluminate spinel phase, a calcium aluminosilicate phase, a borate phase and a silicate phase is generated on the surfaces of ceramic particles of a porous ceramic filter through a chemical reaction; the magnesium alloy filter has high strength and good high-temperature stability, and the problems that the filter loses efficacy and magnesium alloy melt is polluted due to the fact that the filter is eroded by magnesium alloy liquid are effectively solved.

A high-strength, highly transparent nanocrystalline glass, a preparation method therefor, and a use thereof. The high-strength, highly transparent nanocrystalline glass uses precursor minerals mainly comprising synthetic aluminum-rich feldspar-like ceramic glass material, β-spodumene material, cordierite material, synthetic β-dicalcium silicate material, and magnesium aluminum spinel material for the main body of a feldspar-like matrix glass having a stable structure. Ultrafine zirconia powder having a particle size of less than 10 nm is used as a nucleating agent and microcrack damping and pinning agent, to control the formation of nanocrystals smaller than 100 nm in the glass body formed after melting. The volume percentage content of the nanocrystals is 50%-95%, and the nanocrystals together with the matrix glass form a high-strength, highly transparent nanocrystalline glass having a uniform microstructure. The obtained nanocrystalline glass has high hardness, high fracture toughness and high light transmittance, and is suitable for manufacturing various types of optical glass.

A phosphor plate includes a plate-like composite including a base material and a phosphor contained in the base material, in which the base material contains spinel, the phosphor includes a phosphor containing a Si element, and in an X-ray diffraction pattern of the phosphor plate using a Cu-Kα ray, in a case in which peak intensity corresponding to the spinel having a diffraction angle 2θ in a range of 36.0° or more and 37.4° or less is set to 1, total intensity of peaks having a diffraction angle 2θ in a range of 32.5° or more and 34.5° or less satisfies 0.5 or less.

The invention provides a coated lithium-rich manganese-based positive electrode material and a preparation method and application thereof.The preparation method comprises the following steps that a lithium-rich manganese-based precursor and a lithium source are mixed and subjected to primary roasting, smashing and sieving, and a lithium-rich manganese-based primary smashed material is obtained; the lithium-rich manganese-based primary crushed material and a coprecipitation reaction raw material liquid phase are mixed for a coprecipitation reaction, coprecipitation reaction raw materials comprise a metal salt solution, a precipitator solution and a complexing agent solution, and a coated lithium-rich manganese-based precursor is obtained; a lithium source and the coated lithium-rich manganese-based precursor are mixed and subjected to secondary roasting, and the coated lithium-rich manganese-based positive electrode material is obtained. According to the preparation method, the lithium-rich manganese-based positive electrode material with a stable crystal structure can be prepared by coating a nanoscale spinel material precursor, so that the problem that oxygen loss and voltage attenuation in a Li2MnO3 nano domain region are induced when lattice stress continuously accumulated by co-lattice Li2MnO3 reaches a critical value can be relieved.

The invention provides a spinel type ferrite composite material with high-performance microwave absorption and a preparation method thereof, and relates to the technical field of microwave absorption ferrite materials. According to the composite material, spinel type ferrite such as Ni < 0.4 > Zn < 0.4 > Me < 0.2 > Fe < 1.94 > Cr < 0.01 > O < 4 > (Me = Mg, Co, Ni, Cu and Zn) is used as a substrate material, the substrate material is compounded with a carbon nano tube with the mass fraction of 6.5 wt% to obtain the composite material, and the finally obtained Ni < 0.4 > Zn < 0.4 > Cu < 0.2 > Fe < 1.94 > Cr < 0.01 > O < 4 > / 6.5 wt% CNTs show good microwave absorption performance and have a smaller microwave absorption peak and a thinner impedance matching thickness compared with other microwave absorbents. The preparation method comprises a solid phase method and an ultrasonic method, and is low in cost, simple to operate and short in preparation period. The prepared composite material has good wave-absorbing performance and has a wider application prospect.

The invention relates to a method for curing harmful components in hazardous wastes, which comprises the following steps: uniformly mixing high-silicon iron tailings and blast furnace fly ash, adding the mixed material into chromium-containing waste liquid, stirring, carrying out plate-frame pressure filtration, carrying out pressure filtration again to obtain a mixed material, cutting the mixed material into blocks, drying the cut mixed material, and roasting after treatment to obtain a roasted product; carrying out rapid water cooling on the roasted product, and grinding after water cooling; and performing magnetic separation on the grinding product to obtain iron ore concentrate containing ferrochrome spinel and low-chromium tailings. According to the method, solid waste high-silicon iron tailings and blast furnace fly ash generated by iron and steel enterprises are used as curing agents, curing of heavy metal chromium in the chromium-containing sludge is achieved, the leaching rate of hexavalent chromium and total chromium in the obtained product is far lower than the standard limit value, harmless treatment of the chromium-containing sludge can be achieved, and the method is suitable for industrial production. The obtained ferrochrome spinel can be recovered through magnetic separation, and the generated low-chromium tailings can be directly subjected to landfill treatment or used as building materials.

A positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.

A magnetic composite includes: a non-metallic inorganic base material; and a ferrite layer provided on a surface of the non-metallic inorganic base material, and the non-metallic inorganic base material has a thickness of 2.0 μm or more, the ferrite layer has a thickness (dF) of 2.0 μm or more and 50.0 μm or less, and contains spinel-type ferrite as a principal component, and a content of α-Fe2O3 in the ferrite layer is 3.0 mass % or more and 25.0 mass % or less.

The invention relates to high-strength and high-transparency nano glass ceramic and a preparation method and application thereof, and the high-strength and high-transparency nano glass ceramic is prepared from a synthetic aluminum-rich feldspar ceramic glass material, a beta-spodumene material, a cordierite material, a synthetic beta-dicalcium silicate material and a magnesium aluminate spinel material. According to the present invention, a stable-structure feldspar matrix glass is adopted as a main body precursor mineral material, zirconia micro-powder with a particle size of less than 10 nm is adopted as a nucleation agent and a micro-crack damping pinning agent, nanometer microcrystals with a particle size of less than 100 nm are controlled to be generated in a glass body formed after melting, and the nanometer microcrystals account for 50-95% by volume; the high-strength and high-transparency nanocrystalline glass with a uniform microstructure is formed and woven with matrix glass in a symbiotic manner. The prepared nano microcrystalline glass has the advantages of high hardness, high fracture toughness resistance and high light transmittance, and is suitable for manufacturing various optical glass.

The invention belongs to the technical field of nano material synthesis and volatile organic compounds (VOCs) degradation, and particularly relates to a method for preparing a high-entropy spinel / biochar composite material by using a Joule thermal shock method and application of the high-entropy spinel / biochar composite material. The preparation method comprises the following steps: firstly, forming gel from metal salt precursors and biomass through a sol-gel method, and then rapidly synthesizing the precursors into the high-entropy spinel by adopting Joule thermal shock. The biochar in the composite material prepared by the invention is of a wormlike lamellar structure, and the high-entropy spinel is polygonal particles and is uniformly loaded on the biochar. Due to the high-entropy effect and lattice distortion effect of the composite material, the number of oxygen vacancies of the material can be obviously increased, defect sites can be formed on the surface of the material through instant energy impact, the catalytic performance of the material can be improved, and the catalytic material can efficiently convert methylbenzene into carbon dioxide and water.

Methods and systems for splitting one or more of water and carbon dioxide are disclosed. Exemplary methods can operate under substantially isothermal conditions. The methods can include use of a material including two or more spinel phases in a solid solution. The solid solution can include oxygen, aluminum, and one or more transition metals.

Container whose inner wall surfaces are at least partially covered with a coating having the following crystallized phases, as a percentage based on the total mass of the crystallized phases: Spinel MgAl2O4: 10% to 60%, and Crystallized phases other than spinel MgAl2O4 and corundum: < 10% Corundum: complement to 100%.

The application discloses a preparation method of vanadium-doped and high-hydrated mangan-chromian spinel monocrystal under high temperature and high pressure. The cylindrical mangan-chromian spinel sample is prepared by taking solid rose triangular rhombic manganese carbonate crystal, solid chromium (III) acetate hydroxide crystalline powder, solid vanadium (IV) acetylacetonate oxide powder, solid oxalic acid powder, solid bixbyite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting raw materials; two pieces of water source sheets are made from the bixbyite powder and the chromium hydroxide powder with a weight ratio of 4:1; the two pieces of water source sheets are placed at two ends of the cylindrical mangan-chromian spinel sample and then are placed into a double-capsule structure experimental sample bin with an inner layer sleeve being a graphite tube and an outer layer sleeve being a gold-palladium alloy tube; the high temperature and high pressure reaction is carried out to obtain the mangan-chromian spinel monocrystal; and the preparation technology blank of the vanadium-doped and high-hydrated mangan-chromian spinel large-particle monocrystal under the current high temperature and high pressure conditions is solved.

This invention provides a composite magnesium-iron modified biochar and its method for purifying industrial wastewater, belonging to the technical field of functional materials for water treatment. The composite biochar of this invention uses porous biochar as a substrate, and through bimetallic impregnation, in-situ co-precipitation nucleation with pH control, and programmed temperature calcination, a composite crystalline phase of magnesium-iron layered bimetallic oxide and magnesium-iron spinel is anchored in-situ on its surface and internal pores. This material exhibits excellent magnetic field response characteristics and abundant bimetallic active sites. When added to composite wastewater, the bimetallic synergistic mechanism enables one-step simultaneous adsorption and degradation of COD, ammonia nitrogen, and total phosphorus; after the reaction, only an external magnetic field is needed to quickly achieve solid-liquid separation. This invention completely solves the problem of powder material recovery, and is resistant to desorption and regeneration, exhibiting excellent long-term recycling performance.

To provide a lithium secondary battery which has excellent charge-discharge cycle characteristics at high temperatures, while having low resistance and excellent output characteristics.SOLUTION: Provided are: spinel-type lithium manganese which contains phosphate and is represented by the chemical formula Li1+XMn2-X-YMYO4 (where 0.02≤X≤0.20, 0.05≤Y≤0.30, and M represents Al or Mg), in which the pore volume of pores having a pore diameter of 0.6 μm or less is from 0.003 cm3 / g to 0.2 cm3 / g inclusive and the relative standard deviation of the secondary particle diameters is from 25% to 45% inclusive; a method for producing the spinel-type lithium manganese; and a use of the spinel-type lithium manganese.SELECTED DRAWING: None

This invention discloses a cubic spinel-structured sulfide composite gas-sensitive material, a gas sensor, its preparation method, and its application, belonging to the field of gas sensor technology. The preparation method of this composite gas-sensitive material involves using FeCl2, CdCl2, and InCl3 as metal sources, and thiourea as a sulfur source, placing them together in a solvent of water, adding citric acid or sodium citrate as a dispersant, and obtaining a precursor material through a hydrothermal reaction. After calcination and annealing, a cubic spinel-structured FeIn2S4 / CdIn2S4 heterojunction material powder is obtained. The two gold electrodes and the ceramic tube of the gas sensor are coated with the cubic spinel-structured sulfide composite gas-sensitive material. The gas sensor based on this invention, made from a cubic spinel-structured sulfide composite gas-sensitive material, has a simple manufacturing process, low production cost, and is suitable for industrial mass production. It has broad application prospects in the field of acetone detection in trace hazardous situations.

The invention provides an LNMO particulate material that comprises crystallites, crystals and secondary particles, wherein the secondary particles are composed of a multitude of crystals, and the crystals are composed of a multitude of crystallites, wherein a D50 particle size of the secondary particles is between 3.0 µm and 25 µm, as measured by laser diffraction according to ISO 13320:2020, and wherein a D50 particle size of the crystals is between 0.3 µm and 7.0 µm as measured by scanning electron microscope (SEM), and wherein, the LNMO particulate material is boron modified. In other aspects, the invention further provides a process for the production of boron modified Lithium-Nickel-Manganese-Oxide (LNMO) particulate material and a boron modified LNMO material obtainable by the process according to the present invention.

The invention discloses a method for preparing compact fine-grain magnesium aluminate spinel ceramic by low-temperature sintering, which comprises the following steps: S1, mixing ethanolamine, magnesium acetate tetrahydrate and water according to a certain proportion to obtain a mixed solution A; s2, mixing citric acid, aluminum isopropoxide and water according to a certain proportion to obtain a mixed solution B; s3, slowly adding the mixed solution A into the solution B in the step S2 to form uniform colloid; s4, drying the colloidal solution to obtain a dried precursor; s5, performing low-temperature calcination on the precursor to obtain nano magnesium aluminate spinel powder; s6, carrying out ball milling and spray granulation to obtain spherical granulation powder with uniform particle size; s7, performing dry pressing molding and cold isostatic pressing molding to obtain a to-be-sintered ceramic biscuit; and S8, sintering in a muffle furnace to obtain the final magnesium aluminate spinel ceramic. The powder is subjected to ball milling, spray granulation, dry pressing forming and cold isostatic pressing forming, and then the compact fine-grain magnesium aluminate spinel ceramic is prepared through low-temperature sintering.

The invention relates to a ferrite material as well as a preparation method and application thereof, and belongs to the technical field of laminated soft magnetic ferrite inductors / magnetic beads. The ferrite material comprises a main component and an additive accounting for 1.0 wt%-2.5 wt% of the mass of the main component, the main component is prepared from the following components in percentage by mass: 64.56 percent to 66.48 percent of Fe2O3, 14.85 percent to 17.50 percent of NiO, 10.93 percent to 11.93 percent of ZnO and 5.09 percent to 8.10 percent of CuO; the chemical formula of the additive is M1-xFe2O4, and x < lt > is greater than or equal to 0; m is at least one of Li, Mg, Ti, Sr, Mo, Bi and Fe. The additive is a spinel phase, and the high-purity spinel phase ferrite material is obtained by mixing and co-firing the additive of the spinel phase and the main component of the spinel phase.

The invention relates to the technical field of ethylbenzene dehydrogenation, in particular to a preparation method and application of a spinel CoFe2O4 oxygen carrier, and the preparation method comprises the following steps: dissolving cobalt salt and iron salt in water according to a specific molar ratio, adding ethylene glycol, methanol and a polymethyl methacrylate template agent, uniformly mixing, drying, carrying out programmed temperature rise calcination in an oxygen-containing atmosphere, and calcining to obtain the spinel CoFe2O4 oxygen carrier. The CoFe2O4 oxygen carrier with a single spinel crystal structure is obtained. The oxygen carrier is used as a recyclable lattice oxygen source and can catalyze ethylbenzene oxidative dehydrogenation to generate styrene at the ultralow temperature of 200-400 DEG C, especially about 250 DEG C, both the ethylbenzene conversion rate and the styrene selectivity can reach 96% or above, and the performance degradation rate is smaller than 5% after at least 41 times of redox cycles. The process conditions are mild, the oxygen carrier structure is stable, the activity is high, and a new way is provided for energy-saving and low-carbon production of styrene.

The application discloses a preparation method of titanium-doped and high-hydrated magnesio-chromian spinel monocrystal under high temperature and high pressure, and the method comprises the following steps: preparing a cylindrical magnesio-chromian spinel sample by taking solid basic magnesium carbonate powder, solid basic chromium acetate crystal powder, liquid tetraisopropyl titanate, solid oxalic acid powder, solid brucite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting raw materials; preparing water source sheets by taking brucite powder and chromium hydroxide powder with a weight ratio of 4:1 as water sources; placing two water source sheets at two ends of the cylindrical magnesio-chromian spinel sample and putting them into a double-capsule structure sample bin together to carry out high temperature and high pressure reaction, so as to obtain titanium-doped and high-hydrated magnesio-chromian spinel monocrystal; and the method solves the blank of the preparation technology of the titanium-doped and high-hydrated magnesio-chromian spinel large-grain monocrystal under the current high temperature and high pressure conditions, and obtains experimental samples of the titanium-doped and high-hydrated magnesio-chromian spinel large-grain monocrystal.

The present invention relates to a microcrystalline glass and a preparation method thereof. The preparation method comprises the following steps: casting a mixture into glass and then performing a crystallization treatment to obtain the microcrystalline glass, wherein the mixture mainly consists of 40-60wt% SiO2, 22-32wt% Al2O3, 2-9wt% MgO, 3-10wt% ZnO and 4-10wt% ZrO2, and the crystallization treatment is divided into two stages, the temperature of the first stage is 680-780°C, the time is 1-4h, and the temperature of the second stage is 920-980°C, the time is 1-3.5h; the microcrystalline glass obtained by the above preparation method mainly consists of a glass matrix and crystal particles dispersed therein in a dendritic distribution, and the crystal particles consist of cordierite crystal particles, tetragonal zirconia crystal particles and zinc spinel crystal particles. The preparation method of the present invention is simple, and microcrystalline glass with high strength and high hardness can be obtained without tempering treatment.

A composite particle composed of spinel and disordered rock salt domains interspersed therein, made by removing lithium from a disordered rock salt to form a lithium deficient disordered rock salt and heating the lithium deficient disordered rock salt for a time and temperature to form the composite particle.

To provide a sagger and a method for manufacturing the sagger that is resistant to breakage, capable of suppressing the effects of impurities originating from the material forming the sagger from mixing with the material to be fired when the material to be fired is fired using the sagger, and producing high quality fired products.SOLUTION: The sagger according to the present invention has a body made of inorganic material and containing the material to be fired, and a coating layer formed on at least one of the surfaces of the body in contact with the material to be fired, wherein the coating layer has an average primary particle size of 1 nm to 100 nm and consists of one or two or more kinds of nanoparticles selected from alumina, hydrated alumina, zirconia, hydrated zirconia, silica, titania, hydrated titania, magnesia, spinel, and gahnite, and a film-forming component.SELECTED DRAWING: None

The invention belongs to the field of solid electric heating energy storage boilers, and provides a preparation method of a high-temperature-resistant, low-expansion, high-heat-storage and high-resistance heat storage material, the heat storage material is designed based on the microstructure of the material, magnesia particles with the particle size being larger than or equal to 1 mm are selected as aggregate, and organic matter coating is conducted on the magnesia particles through a coating technology; then mixing and twisting 30-50 parts of coated magnesia particles, 40-50 parts of high-alumina bauxite, 4-6 parts of binding clay, 2-3 parts of a binding agent and 3-6 parts of an aqueous solution, bundling the mixed and twisted materials, forming a green body by adopting a mechanical pressing process, and performing high-temperature heat treatment to obtain the heat storage material. The prepared heat storage material is of a magnesia particle-annular pore-spinel / cordierite reaction layer-mullite gradient structure, so that the cooperation of low thermal expansion coefficient, high heat storage capacity and high thermal resistance of the material is realized; the chemical composition of the prepared heat storage material is as follows: 10%-50% of MgO, 50%-80% of Al2O3, 10%-40% of SiO2 and a small amount of impurities.

The invention relates to a spinel-perovskite three-phase high-entropy ceramic powder material, the chemical formula of the three-phase high-entropy ceramic powder material is (A1xA2yA3zA4uA5v) Mn2O4, A1, A2, A3, A4 and A5 are four transition metal elements of Ca, Cu, Ni, Co, Zn and Mg and one rare earth element of La and Pr, the molar ratio of metal atoms is x: y: z: u: v: 2, and x + y + z + u + v = 1; the perovskite-spinel composite material has a spinel phase and a perovskite phase of two cubic structures. The high-entropy ceramic powder material has three phases coexisting, has excellent broadband emissivity and high-temperature thermal stability, and can be used as an infrared radiation material to be widely applied to high-temperature infrared radiation environments, such as the fields of aerospace thermal protection, industrial high-temperature kilns, power station boiler thermal management systems and the like.

A material includes a phase-transformed disordered rocksalt having partially disordered spinel cation ordering to provide suitable galvanostatic cycling behavior. The phase-transformed disordered rocksalt has a chemical formula of LixMnyTMzO2-uFu, where 0.9≤x≤1.3, 0≤y≤1, 0≤z≤0.5,and 0≤u≤0.5, and with TM being Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb, Mo, Sn, W, or mixtures thereof. Additionally, the phase-transformed disordered rocksalt includes a first set of domains and a second set of domains interspersed with the first set of domains. The second set of domains is separated from the first set of domains by one or more antiphase boundaries. Methods and systems are described in this disclosure.

A method of preparing a calcined hydrogenolysis / hydrogenation catalyst includes mixing a copper-containing material, manganese-containing material, sodium aluminate, and water to obtain an aqueous slurry; contacting the aqueous slurry with a caustic material to form a precipitate in a caustic aqueous slurry; removing the precipitate from the caustic aqueous slurry; and removing residual water from the precipitate to form a dried precipitate; calcining the dried precipitate to form the calcined hydrogenolysis / hydrogenation catalyst exhibiting a Brunauer-Emmett-Teller (“BET”) surface area of about 5 m2 / g to about 75 m2 / g. The calcined hydrogenolysis / hydrogenation catalyst may include a spinel structure crystallite size of about 15 nm or less. The calcined hydrogenolysis / hydrogenation catalyst may include a tenorite crystallite size of about 20 nm to 30 nm.

The invention belongs to the technical field of refractory materials, and particularly relates to porous periclase-spinel ceramic prepared from waste magnesium-iron bricks and a preparation method thereof.The preparation method comprises the following steps that S1, the waste magnesium-iron bricks are crushed and screened, and granules are obtained; s2, the granules and water are mixed according to the proportion not lower than 1: 3, the mixture is filtered out after being soaked, the same amount of water is added again to be soaked, then the granules are moved into a constant-temperature and constant-humidity environment with the temperature not lower than 60 DEG C and the humidity not lower than 90% to be subjected to accelerated hydration, and the granules are taken out to obtain hydrated granules; s3, mixing and stirring the hydrated granules and light calcined magnesia powder, and uniformly mixing to obtain a mixture; and S4, extruding the mixture into spheres, controlling the density to be not less than 2.85 g / cm < 3 >, carrying out three-stage high-temperature sintering, and cooling to obtain the porous periclase-spinel ceramic.