1850results about "Aluminium compounds" patented technology

The invention belongs to the field of catalysts, and particularly relates to an alumina carrier as well as a preparation method and application thereof. The surface of the alumina carrier has oxygen-containing groups, and the density of the oxygen-containing groups on the surface of the alumina carrier is 0.15-5mmol / m < 2 >. Wherein the oxygen-containing group is at least one of hydroxyl, carboxyl and lactone group; the specific surface area of the alumina carrier is 10-150m < 2 > / g. The types, the number and the density of oxygen-containing groups on the surface of the obtained carrier are improved, and various index requirements of various supported catalysts on dispersion forms and dispersion degrees of different metal active components in the field of petrochemical engineering can be well met; and the carrier also has the characteristics of low bulk density, high water absorption rate, large pore volume and large average pore size, has a gain effect on uniform distribution of active metal components in the catalyst loading process, and has extremely high application value.

The invention relates to the technical field of lithium ion batteries, and provides a lithium cobalt oxide composite material which comprises a core body and a coating layer coating the core body, the core body comprises O2-phase lithium cobalt oxide, and the O2-phase lithium cobalt oxide is doped with an element M; the coating layer comprises an oxide containing an N element; the M element comprises at least one of Al, Mg, W, Ti, La, Zr, Ni, Mn and Y; n comprises at least one of Al, Mg, Y, W, Nb, La, Zr, Ti and P. The lithium cobalt oxide composite material provided by the invention is used as a positive electrode material of a lithium ion battery, and the cycling stability of the lithium ion battery under high potential is improved.

The invention provides pseudo-boehmite and a preparation method thereof, and the method comprises the following steps: carrying out a neutralization reaction on sodium metaaluminate and an acidic aluminum salt to generate an amorphous precipitate, so as to obtain first slurry; filtering the first slurry, and pulping a filter cake obtained by filtering to obtain second slurry; and adjusting the pH value of the second slurry to a preset pH value by using an alkaline additive so as to age the second slurry, thereby obtaining the pseudo-boehmite. The prepared pseudo-boehmite meets the following indexes: the pore volume is greater than 1.2 ml / g, and the impurity content of acidic components is lower than 0.5 wt%.

The invention relates to the technical field of water treatment, and discloses a modified polyaluminum chloride flocculant and a preparation method thereof.The modified polyaluminum chloride flocculant is prepared from, by weight, 50-65 parts of polyaluminum chloride, 8-12 parts of magnesium silicate, 5-8 parts of carboxymethyl chitosan, 15-25 parts of polyaluminum ferric chloride and 3-5 parts of tea polyphenol; the molar ratio of aluminum ions to iron ions in the modified polyaluminum chloride flocculant is (3-4.5): 1. According to the invention, an inorganic-organic dual-modifier synergistic effect mechanism is adopted to construct a'rigid framework-flexible network 'composite structure, and the structure can significantly improve the adsorption capacity of Pb < 2 + >. Meanwhile, the mechanical property of the flocculating agent is improved, so that the flocculating agent can be applied to a high-turbulence environment.

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention belongs to the technical field of desiliconized fly ash, and particularly relates to a high-alumina-silica-ratio material capable of replacing bauxite as well as a preparation method and application of the high-alumina-silica-ratio material. The preparation method comprises the following steps: S1, crushing coal gangue, and grinding the crushed coal gangue until the particle size is less than 40 meshes to obtain a ground material; s2, mixing the ground material and a catalyst according to a weight ratio of 100: (1-2), roasting, and cooling to obtain activated coal gangue; the catalyst comprises sodium carbonate, calcium oxide and aluminum oxide in a weight ratio of 1: (0.3-0.5): (1.4-1.6); s3, mixing a sodium hydroxide solution, the activated coal gangue and a surfactant, and reacting at 50-90 DEG C for 1-6 hours to obtain desiliconized slurry; and S4, filtering the desiliconized slurry, collecting a solid phase, washing with water, and drying to obtain desiliconized fly ash, namely the high alumina-silica ratio material capable of replacing bauxite. The method is high in desiliconization rate.

The invention discloses a silicon-carbon material and a preparation method and application thereof, belongs to the technical field of negative electrode materials, and overcomes the defect of high volume expansion rate of a silicon-based material in the prior art. The silicon-carbon material provided by the invention comprises porous carbon and silicon deposited in porous carbon channels; the porous carbon comprises mesopores and macropores, the pore diameter of the mesopores is greater than 10nm and less than or equal to 50nm, and the pore diameter of the macropores is greater than 50nm and less than or equal to 100nm; based on the total volume of the pores in the porous carbon, the volume fraction of the mesopores is 50%-75%, and the volume fraction of the macropores is 10%-20%; and the silicon deposited in the mesopores and the macropores is a hollow silicon nanotube. Silicon in the silicon-carbon material mainly exists in the form of hollow silicon nanotubes, and during lithium intercalation expansion, since expansion spaces are reserved in the hollow nanotubes, the lithium intercalation expansion of the whole silicon-carbon material is reduced.

The invention relates to the technical field of lithium ion batteries, in particular to a composite lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The composite lithium-rich manganese-based positive electrode material is of a three-layer structure and sequentially comprises a lithium-rich manganese-based oxide positive electrode material matrix, a first coating layer and a second coating layer from inside to outside, the first coating layer is a mixture of halide solid electrolyte and lithium-containing oxide; and the second coating layer is an oxide solid electrolyte. The conductivity of a contact interface with a positive electrode material can be improved, the resistance is reduced, the moisture absorption degradation of halide is inhibited, the packaging difficulty is reduced, and the cycle performance of the halide-added solid electrolyte after moisture absorption is improved.

The invention relates to the technical field of non-ferrous metallurgy, and discloses a dissolution method of high-iron-monohydrate-boehmite type bauxite. The method comprises the following steps: (1) preparing mixed ore pulp from high-iron monohydrate bauxite, sodium aluminate circulating mother liquor and an additive; the additive is one or a mixture of more of organic alkali, carboxylic acid and amino acid; (2) the mixed ore pulp is subjected to ultrasonic treatment and then heated to 190-280 DEG C for a dissolution reaction, dissolution slurry and dissolution residues are obtained, the dissolution residues are subjected to magnetic separation and recovery, and iron ore concentrate is obtained; the power of the ultrasonic treatment is 200 to 300W, and the time of the ultrasonic treatment is 30 to 50 minutes. According to the method, the problem that iron minerals are difficult to separate due to silicon minerals in the dissolution process of the high-iron monohydrate bauxite is solved. The method is simple in process, low in production cost, low in equipment requirement and good in industrialization prospect.

The application discloses a kind of derived biomass hard carbon material pulverization process, belong to biomass charcoal material processing technical field, first, pulverization process includes the following steps: after drying, the coconut shell derived hard carbon block is carried out primary crushing, while spraying first modifier, obtain the particle size 1~3mm of coarse crushing modified particle;Coarse crushing modified particle is carried out secondary precision crushing under argon atmosphere, while spraying second modifier, obtain the precision crushing modified particle of D 50 Particle size is 15 μm;Precision crushing modified particle is carried out roll grinding spheroidization, while spraying third modifier, obtain the spherical modified particle of D 50 Particle size is 10 μm;Spherical modified particle is carried out flash drying after cooling, then add magnesium stearate to it, after mixing, obtain derived biomass hard carbon material.Then, the application realizes breakthrough in tap density, particle size distribution, first efficiency and other core indexes by the coordination of three-stage gradient modification and progressive pulverization process.

The invention provides a positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The particle size distribution curve of the positive electrode material is bimodal distribution, the positive electrode material is composed of large-particle-size secondary spherical particles and small-particle-size secondary spherical particles, the large-particle-size secondary spherical particles are composed of small-particle-size primary spherical particles, the small-particle-size secondary spherical particles are composed of large-particle-size primary spherical particles, and the large-particle-size primary spherical particles are composed of small-particle-size primary spherical particles. The D50 of the large-particle-size secondary sphere particles is 8.0-12.0 [mu] m, the D50 of the small-particle-size secondary sphere particles is 2.0-4.0 [mu] m, the maximum diameter of the small-particle-size secondary sphere particles is not more than 5 [mu] m, and the minimum diameter of the large-particle-size secondary sphere particles is not less than 5 [mu] m. Compared with the prior art, the invention provides the positive electrode material matched with two secondary spherical particles with different primary spherical particle sizes, so that the compaction density and the cycling stability of the positive electrode material are improved.

The present invention provides a method for preparing large-pore spherical alumina, and relates to the technical field of spherical alumina. The preparation method of the present invention comprises the following steps: mixing pseudo-boehmite powder with water to obtain a suspension, adding a peptizing agent for peptization to prepare an aluminum hydroxide sol; adding cross-linking molecules to the aluminum hydroxide sol to form a system to be cross-linked; adding a cross-linking agent to the system to be cross-linked to obtain a sol containing a prepolymer; and subjecting the sol to oil-ammonia column molding, drying and roasting to obtain large-pore spherical alumina. The present invention adopts an oil-ammonia column molding method, which does not require the addition of a pore-expanding agent or new equipment, and the preparation process is simple and does not introduce new impurities, so it is suitable for industrial production. The large-pore spherical alumina prepared by the present invention has a pore volume of up to 0.60cm 3 / g or more, and can be used as a propane dehydrogenation catalyst carrier.

The invention provides a method for preparing Bayer stone based on a high-alpha-k sodium aluminate solution, and belongs to the field of aluminum oxide preparation. The method comprises the following steps: adding a morphology regulating agent into a sodium aluminate solution with set alpha k to obtain a mixed solution; introducing a mixed gas with a set CO2 volume concentration into the mixed solution to perform a carbonation reaction under a set condition, and obtaining Bayer stone slurry when a reaction system of the carbonation reaction reaches a set NK concentration; and carrying out solid-liquid separation on the Bayer stone slurry to obtain the Bayer stone. The method comprises the following steps: firstly, adding a morphological regulating agent into a sodium aluminate solution to regulate the growth process and morphological characteristics of crystals so as to reduce crystal defects and impurity content; secondly, the carbonation reaction rate and the product composition are controlled by controlling the carbonation reaction conditions; and finally, by accurately controlling the end-point caustic alkali concentration, the mixing of impurities in the forming process of the Bayer stone can be reduced, so that a high-purity Bayer stone product is obtained.

The invention relates to the technical field of catalyst carriers, and discloses reticular porous spherical aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing an aluminum source, acid, a pore-forming agent, a surfactant and water to obtain pseudo sol; (2) performing ultrasonic treatment and oil ammonia column forming treatment on the pseudo sol obtained in the step (1) to obtain gamma-Al2O3 spherical gel beads; and (3) aging, washing, drying and calcining the gamma-Al2O3 spherical gel beads obtained in the step (2) to obtain the reticular porous spherical alumina. The spherical aluminum oxide prepared by the method has abundant communicated reticular pore channels, is obviously distributed in mesopore and macropore ranges, is beneficial to obviously improving dispersion and loading of a catalyst in an aluminum oxide carrier and improving the performance of petroleum reforming and propane dehydrogenation, and has industrial production utilization value and commercial value.

The invention discloses a silicon / graphite / carbon-aluminum oxide composite negative electrode material and a green preparation method thereof, and belongs to the technical field of lithium ion batteries. Aiming at the problems of high volume expansion rate and poor cycling stability of a silicon-based negative electrode and high cost of a traditional process, the invention innovatively provides the following scheme: 1) waste photovoltaic silicon wafer ball-milling liquid and waste graphite are taken as core raw materials, and resource recycling is realized; (2) phenolic resin and chitosan are adopted as double carbon sources, a nitrogen-doped carbon layer (the nitrogen content is 3-5 wt.%) is formed through pH-induced self-assembly, and the conductivity and the Li < + > diffusion rate are synchronously improved; and 3) aluminum nitrate is introduced for pyrolysis to generate 2-5nm aluminum oxide for doping, so that the side reaction of the electrolyte is inhibited, and the volume expansion of silicon is relieved (the expansion rate is less than or equal to 120%). The preparation process comprises the steps of silicon / graphite dispersion, double-carbon-source compounding, ammonia water regulation and control precipitation and gradient calcination. Experiments show that the specific capacity of the optimized material under the current of 0.5 A / g reaches more than 800mAh / g, the 100-time cycle capacity retention ratio is more than 98%, the 1000-time cycle capacity retention ratio is more than 80%, the reversible specific capacity under the multiplying power of 3A / g is more than 550mAh / g, and the raw material cost is reduced by 40%. The invention has the advantages of high capacity, long service life, environmental protection and economy, and provides an innovative solution for the fields of power batteries and energy storage.

The invention relates to the technical field of comprehensive treatment of industrial solid wastes, and particularly discloses a comprehensive utilization method of secondary aluminum ash, which specifically comprises the following steps: deoxidizing the secondary aluminum ash; carrying out hydrolysis treatment on the deoxidized secondary aluminum ash, and carrying out solid-liquid separation to obtain mixed gas, a hydrolysis slurry solid phase and high-salt-alkali ammonia nitrogen hydrolysate; separating and purifying the mixed gas to obtain hydrogen; carrying out at least two times of acid washing treatment and at least one time of alkali washing treatment on the hydrolyzed slurry solid phase to obtain a solid phase product for the concrete admixture; and carrying out ammonia-nitrogen separation on the high-salt-alkali ammonia-nitrogen hydrolysate, and carrying out gradient acidification treatment to obtain aluminum hydroxide and inorganic salt crystals. By implementing the method, high-added-value overall utilization of the secondary aluminum ash can be realized.

The invention provides a method for preparing low-sodium aluminum hydroxide through a two-stage method, and belongs to the field of aluminum hydroxide production. The method comprises the following steps: adding a first aluminum hydroxide seed into a sodium aluminate solution, and carrying out first-stage decomposition to obtain first mixed slurry; carrying out solid-liquid separation on the first mixed slurry to obtain first low-sodium aluminum hydroxide and separated mother liquor; adjusting the alpha k of the separated mother liquor to a second set alpha k; adding a second aluminum hydroxide seed into the separated mother liquor to perform second-stage decomposition to obtain second mixed slurry; and carrying out solid-liquid separation on the second mixed slurry to obtain second low-sodium aluminum hydroxide. According to the present invention, the sodium aluminate solution is subjected to the first-stage decomposition, such that the sodium aluminate solution is purified, the solution alpha k is increased, and the saturation degree of the solution is reduced so as to produce the aluminum hydroxide with the high purity during the second-stage decomposition, such that the technology of synchronously producing the two low-sodium aluminum hydroxide in the same process is achieved. Therefore, the impurity ion content of the metallurgical-grade aluminum hydroxide is reduced.

The invention provides pseudo-boehmite, a preparation method thereof and a gamma-alumina carrier with high diffusion mass transfer performance. The preparation method comprises the following steps: respectively preheating an aluminum-containing acidic solution, a sodium metaaluminate solution and reaction bottom water to gel forming reaction temperature; under stirring, dropwise adding the first part of the aluminum-containing acidic solution and the first part of the sodium metaaluminate solution into the reaction bottom water, controlling the pH value of the gelling reaction to be 5.0-8.5, and uniformly mixing to obtain material slurry; dropwise adding all the residual aluminum-containing acidic solution and the residual sodium metaaluminate solution into the material slurry, and carrying out gel forming reaction to obtain reaction slurry; and carrying out step-by-step variable-temperature aging on the reaction slurry, and carrying out suction filtration, washing and drying to obtain the pseudo-boehmite. According to the method, the problem of poor pore regulation flexibility in a traditional double-aluminum method is solved, the limitation of the pore size can be overcome, and the pore permeability of the gamma-alumina carrier is improved, so that the diffusion mass transfer performance of the gamma-alumina carrier is greatly enhanced.

The invention provides a method and system for separating and washing red mud in aluminum oxide production, and the method comprises the following steps: pretreating red mud slurry to improve the filtering performance of the red mud slurry; filtering the pretreated red mud slurry under set filtering conditions to form a red mud filter cake; in the filtering process, when the thickness of the dehydrated red mud filter cake reaches a set thickness, dehydrating the red mud filter cake so as to reduce the moisture content of the dehydrated red mud filter cake; performing multi-stage countercurrent washing on the dehydrated red mud filter cake to obtain a countercurrent washing solution; and carrying out purification treatment and concentration treatment on the countercurrent washing liquid, and returning the countercurrent washing liquid subjected to purification treatment and concentration treatment to the multi-stage countercurrent washing step as a washing liquid for cyclic utilization. The problem that the resource recycling rate is low in the red mud separating and washing process in aluminum oxide production is effectively solved.

The invention relates to a method for recycling aluminum, iron and lithium from waste lithium iron phosphate batteries. The method comprises the following steps: firstly, separating a positive electrode material of a waste battery cell, removing a binder through high-temperature treatment, adding the positive electrode material into a NaOH solution and a viscous liquid cosolvent, finally stirring and dissolving, neutralizing and adjusting the pH value through sulfuric acid, and precipitating and recovering aluminum; then sulfuric acid is matched with hydrogen peroxide, residual filter residues are stirred and dissolved, the pH value is adjusted in multiple steps, iron and lithium are precipitated respectively, and Fe (OH) 3 and Li2CO3 precipitates are obtained in sequence; the viscous liquid cosolvent disclosed by the invention is prepared from 1-aminoethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt and boric acid powder; the recovery rate of aluminum, lithium and iron is high, the recovery cost is low, and the economic value is high.

The invention discloses a preparation method of high-basicity polyaluminum chloride, which comprises the following steps: by taking hydrochloric acid with the mass fraction of 30% and aluminum hydroxide as raw materials, adding solid polyaluminum chloride into a chitosan-blended kaolin solution which is 2-5 times of the total amount of the solid polyaluminum chloride, then adding a hydroxyapatite agent which is 10-15% of the total amount of the solid polyaluminum chloride, and fully stirring to obtain the high-basicity polyaluminum chloride. And carrying out suction filtration and drying to obtain the high-basicity polyaluminum chloride. According to the high-basicity polyaluminum chloride disclosed by the invention, hydrochloric acid and aluminum hydroxide are adopted as raw materials and are matched with calcium carbonate powder and calcium aluminate powder to prepare solid polyaluminum chloride, and then chitosan is blended with kaolin liquid and a hydroxyapatite agent for coordination and synergism, so that the high-basicity polyaluminum chloride is prepared through the coordination and synergism of the raw materials; the C0D, turbidity and heavy metal removal rate of the obtained high-basicity polyaluminum chloride product are improved in a balanced manner, and meanwhile, the durability and stability effects of the product are remarkable.

The invention belongs to the field of functional composite materials, and particularly relates to low-viscosity and high-dispersity aluminum oxide slurry and a preparation method thereof.The low-viscosity and high-dispersity aluminum oxide slurry is prepared from a newly-designed phosphono-carboxyl block copolymer and biquaternary ammonium salt polyether silane as composite modifiers; and efficient anchoring and stable dispersion of the surfaces of alumina particles are realized through the synergistic effect of molecular structures. The phosphono-carboxyl block copolymer is prepared through controllable polymerization and deprotection reaction, and strong chemical bonding is formed between a phosphono group and the surface of aluminum oxide; the biquaternary ammonium salt polyether silane is subjected to click chemical synthesis, and electrostatic adsorption of quaternary ammonium salt and the steric hindrance effect of a polyether chain are combined. When the slurry is prepared, the two modifiers are sequentially added into water, the aluminum oxide powder is added after the pH value is adjusted, finally, the isobutylene maleic anhydride copolymer and the defoaming agent are introduced, and the slurry is obtained through vacuum defoaming and filtering. The slurry prepared by the method has the characteristics of high solid content, low viscosity and good dispersion stability.

The invention discloses a process for producing polyaluminum chloride by recycling aluminum ash. The process comprises a primary aluminum ash pretreatment process, a secondary aluminum ash deamination process, an ammonium chloride crystallization process, a liquid polyaluminum chloride process and a solid polyaluminum chloride process, the primary aluminum ash pretreatment procedure comprises a first cyclone separator, a ball mill, a screening machine and a bag-type dust collector, the input end of the first cyclone separator is connected with a primary aluminum ash bin through conveying equipment, the coarse ash end of the first cyclone separator is connected with a feeding port of the ball mill, and a discharging port of the ball mill is connected with a feeding port of the screening machine; fine powder screened by the screening machine and secondary aluminum ash fine powder discharged by the first cyclone separator are collected into a secondary aluminum ash bin, and dust outlets of the first cyclone separator, the ball mill and the screening machine are connected with a dust inlet of the bag-type dust collector through pipelines. By arranging a series of structures, the produced polyaluminum chloride is high in purity, the economic benefit of the process is improved, tail gas is washed, and the pollution is reduced.

The present invention provides a method for producing sodium tetrachloroaluminate, and relates to the technical field of chemical synthesis, in order to solve the problem that the newly introduced nitrogen has not been subjected to temperature treatment, and as the nitrogen is introduced and discharged, the heat in the reaction system is lost as the nitrogen flows. The method for producing sodium tetrachloroaluminate comprises: adding raw materials into a reaction tank; when a shutoff air inlet pipeline connected to the reaction tank is controlled to be in a conducting state, and a shutoff exhaust pipeline connected to the reaction tank is in a closed state, an inert gas is introduced into the reaction tank; when the pressure in the reaction tank reaches a preset value, the shutoff air inlet pipeline connected to the reaction tank is controlled to be in a closed state; heating the raw materials in the reaction tank to obtain a semi-finished product; transferring the semi-finished product into a settling tank; adding aluminum foil into the settling tank containing the semi-finished product, introducing an inert gas and keeping it still to obtain sodium tetrachloroaluminate; transferring the sodium tetrachloroaluminate into a storage tank into which the inert gas is introduced.

The invention relates to a method for synergistically extracting lithium and aluminum from clay type lithium ores, and belongs to the technical field of comprehensive utilization of clay type lithium ores. The method comprises the following steps: firstly, adding concentrated sulfuric acid into the clay type lithium ore for sulfuric acid curing to obtain a cured product; then, the cured product is subjected to water leaching, a leaching solution and Si-enriched slag are obtained, and the Si-enriched slag can be used as a Si extraction raw material; then, the leachate is sequentially subjected to purification, concentration and pyrolysis, a pyrolysis product and flue gas are obtained, the flue gas is subjected to dust collection and acid making, sulfuric acid is obtained, and regenerated sulfuric acid is returned to the sulfuric acid curing procedure to be recycled; and finally, washing the pyrolysis product with water to obtain an Al2O3 product and Li-enriched liquid, and carrying out alkali adjustment and lithium precipitation on the Li-enriched liquid to obtain a Li2CO3 product. According to the method, the technological process is simple, the extraction efficiency is high, sulfuric acid can be regenerated and recycled, collaborative extraction and efficient separation of valuable metal lithium / aluminum are achieved, and a new technological thought is provided for comprehensive utilization of clay type lithium ore.

The invention discloses a method for preparing graphene coated inorganic nonmetal powder through chemical vapor deposition and a composite material prepared by the method. According to the method, graphene directly grows on the surface of inorganic non-metal powder through chemical vapor deposition to obtain the graphene-coated inorganic non-metal powder composite material, a metal catalyst and / or a non-metal catalyst are / is adopted in vapor deposition, the metal catalyst is fixed in a low-temperature area of a reactor for chemical vapor deposition, and the non-metal catalyst is fixed in a low-temperature area of the reactor for chemical vapor deposition. The temperature of the low-temperature region is lower than the melting point of the metal catalyst. According to the method, the catalyst (including the non-metal catalyst and / or the metal catalyst) is introduced into vapor deposition, high-quality graphene can be grown on the surface of the non-metal powder under the catalytic action of the catalyst, amorphous carbon and other impurity phases in the composite material are reduced, meanwhile, the use amount of hydrogen can be reduced, and the production safety can be improved.

To provide a surface-treated inorganic oxide in which the surface of an inorganic oxide such as an inorganic filler or an inorganic pigment is treated with a specific polymer treating agent, and which exhibits enhanced dispersibility, compatibility, and fillability with respect to various media.SOLUTION: Provided is a surface-treated inorganic oxide that is a treated product in which an inorganic oxide is surface-treated with a polymer treating agent. The polymer treating agent is a polymer whose number-average molecular weight is 6,000 to 30,000, including a constitutional unit (1) derived from a monomer 1 represented by general formula (1), a constitutional unit (2) derived from a monomer 2 such as (meth)acryloyloxypropylmethyldimethoxysilane, and an optional constitutional unit (3) derived from a vinyl monomer. (R1 represents a hydrogen atom or a methyl group. A represents O or NH. X represents an ethylene group or a propylene group. Y represents O, NHCOO, or NHCONH. Each R2 independently represents a hydrogen atom or a methyl group. R3 represents an alkyl group having 1 to 18 carbon atoms.)SELECTED DRAWING: None

The invention provides a preparation method of low-sodium high-temperature alpha-phase alumina micro powder, and belongs to the technical field of alumina powder. The preparation method comprises the steps of acid leaching, coating and post-treatment. The coating step comprises the following steps: adding a silica sol solution into an acid-leached aluminum oxide suspension for the first time, stirring at 74-78 DEG C for 1.0-1.4 hours, then adding the silica sol solution for the second time, stirring for 1.0-1.5 hours while keeping the temperature, then adding the silica sol solution for the third time, and stirring for 0.8-1.2 hours at 62-65 DEG C to obtain silica sol-coated aluminum oxide; the alpha-phase alumina micropowder prepared by the preparation method disclosed by the invention is uniform in particle size, low in sodium oxide content, high in alpha-phase conversion rate and good in powder fluidity.

A solid electrolyte according to one aspect of the present invention is a solid electrolyte containing lithium, phosphorus, sulfur, aluminum, nitrogen, bromine, and iodine as constituent elements and having a crystal structure, wherein the solid electrolyte satisfies conditions (a), (b), or (c) below when a molar ratio of the lithium to the phosphorus is represented by r1, a molar ratio of a sum of the bromine and the iodine to the phosphorus is represented by r2, and a molar ratio of a sum of the bromine and the iodine to the nitrogen is represented by r3. 3.00≤r1−r2≤3.60and1.5≤r3≤100 2.80≤r1−r2<3.00and2.0≤r3≤100 2.60≤r1−r2<2.80and2.5≤r3≤100

The invention provides alpha-aluminum oxide powder and a preparation method, and belongs to the field of inorganic nonmetals. The method comprises the following steps: mixing an aluminum oxide precursor, a steric hindrance agent and a solvent to obtain mixed slurry; sanding the mixed slurry to obtain superfine slurry; carrying out spray drying on the superfine slurry to obtain superfine powder; mixing the ultrafine powder and a grain inducer to obtain a roasting precursor; and roasting the roasting precursor under set roasting conditions to obtain the alpha-aluminum oxide powder. Firstly, a steric hindrance agent is added into an aluminum oxide precursor, so that steric hindrance is formed in emulsification and dispersion processes, and agglomeration of powder is inhibited; secondly, through sanding, dispersity and uniformity of raw material particles are guaranteed; thirdly, a seed crystal inducer is added into the superfine powder, so that superfine particles can be formed through induction, and the conversion temperature can be reduced. Therefore, the alpha conversion rate of the alpha-aluminum oxide is improved, and the dispersion stability of the alpha-aluminum oxide is improved.