605results about "Aluminium oxides/hydroxides" patented technology

The invention provides a preparation method of macroporous high-hydrothermal-stability aluminum oxide and pseudo-boehmite, and the preparation method of the pseudo-boehmite comprises the following steps: step 1, adding an aluminum salt solution and an alkali solution into a rotating liquid membrane reactor at the same time, and nucleating at 20-30 DEG C to obtain nucleating slurry; wherein the rotating speed of the rotating liquid film reactor is 500 to 1200 rpm, and the stator-rotor gap of the rotating liquid film reactor is 0.1 to 0.3 mm; and step 2, transferring the nucleation slurry into a crystallization reaction device, crystallizing at 70-90 DEG C, and then carrying out solid-liquid separation and drying to obtain the pseudo-boehmite. The most probable pore size of the aluminum oxide prepared by the method is 6-12nm, the specific surface area is 150-600m < 2 > / g, and the aluminum oxide can still keep higher specific surface area after being subjected to hydrothermal treatment for 120 hours.

The present disclosure relates to the field of sodium-ion battery technology, and specifically, to a method for preparing carbon-coated sodium iron fluorophosphate from waste lithium iron phosphate and the application thereof. The method for preparing carbon-coated sodium iron fluorophosphate from waste lithium iron phosphate includes: mixing a waste lithium iron phosphate material with an alkaline solution for reaction, followed by solid-liquid separation, to obtain an aluminum-containing filtrate and a lithium iron phosphate filter residue; mixing the lithium iron phosphate filter residue, aluminum chloride and sodium chloride uniformly, followed by vacuum calcination, to obtain a calcination material; and mixing the calcination material with at least one of a sodium source, an iron source and a phosphorus source uniformly to obtain a mixture to which a fluorine source, a carbon source and a solvent are added for uniformly mixing, followed by drying and calcination sequentially to obtain the carbon-coated sodium iron fluorophosphate. The method has the advantages of low costs, a high added value, a short process, and a high recovery rate, and the carbon-coated sodium iron fluorophosphate obtained from the method has excellent electrochemical performance.

The invention provides a large-area coated lithium manganate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials, and the large-area coated lithium manganate positive electrode material comprises a lithium manganate positive electrode material body subjected to grain boundary pretreatment and a coating layer coating the surface of the lithium manganate positive electrode material body. The general molecular formula of the lithium manganate positive electrode material body subjected to grain boundary pretreatment is Li < 1 + a > Mn < 2-b > MbO4, M is a doping element, a is more than or equal to-0.1 and less than or equal to 0.3, and b is more than or equal to 0 and less than or equal to 0.3; the surface coating layer comprises an M'coating element. The lithium manganate positive electrode material body subjected to grain boundary pretreatment can realize large-area coating, and the lithium manganate positive electrode material subjected to special grain boundary pretreatment and large-area coating has excellent structural stability, so that corrosion of an electrolyte to lithium manganate is relieved, Mn dissolution at a high temperature is inhibited, and the lithium manganate positive electrode material has good electrochemical performance. Therefore, the lithium manganate positive electrode material has excellent high-temperature circulation and high-temperature storage performance, and the method is simple in process and can be implemented and popularized.

The invention relates to high-peptization pseudo-boehmite and a preparation method thereof, and belongs to the technical field of porous aluminum oxide preparation. The method comprises the following steps: obtaining slurry containing pseudo-boehmite colloidal particles; mixing the slurry containing the pseudo-boehmite colloidal particles with an alkaline auxiliary agent to obtain a mixed solution; and aging the mixed solution at a set temperature so as to enable the alkaline additive to perform surface modification on the pseudo-boehmite colloidal particles, thereby obtaining the high-peptizing-solubility pseudo-boehmite. According to the invention, the alkaline auxiliary agent acts on the colloidal particle surface of the pseudo-boehmite at a proper temperature, so that the pore structure of the pseudo-boehmite is maintained, and meanwhile, the pseudo-boehmite with high peptizing property is constructed.

Embodiments described herein relate to removal of aluminum impurities from battery waste. In some aspects, a method for removing aluminum impurities includes preprocessing a quantity of battery waste to improve removal of aluminum impurities from the quantity of battery waste. The method further includes removing at least a portion of the aluminum impurities from the quantity of battery waste, modifying the removed aluminum impurities to form a coating precursor and / or a doping precursor, and applying the coating precursor and / or the doping precursor to an electrode material. In some embodiments, the method further includes characterizing the aluminum impurities in the quantity of battery waste and regenerating the electrode material. In some embodiments, the removing can be via sieving, cyclone separation, air separation, elutriation, and / or dissolution. In some embodiments, the doping precursor can include aluminum hydroxide (Al(OH)3). In some embodiments, the regenerating includes applying a heat treatment to the electrode material.

The invention relates to pseudo-boehmite and a preparation method thereof, and belongs to the technical field of porous alumina preparation. The method comprises the following steps: carrying out neutralization reaction on aluminum sulfate and an alkali source to obtain pseudo-boehmite colloidal particle slurry; aging the pseudo-boehmite colloidal particle slurry to obtain aged slurry with a set pH value; carrying out solid-liquid separation on the aged slurry to obtain a solid-phase substance; and washing the solid-phase substance for multiple times by using an alkaline solution containing ammonium ions so as to remove sulfate radicals carried by the solid-phase substance, thereby obtaining the pseudo-boehmite. Through the synergistic effect of the aging slurry with the set pH value and the alkaline solution containing ammonium ions, the content of sulfate radicals in the pseudo-boehmite is specifically reduced.

The invention provides modified aluminum oxide with a high hydroxyl density surface as well as a preparation method and application of the modified aluminum oxide. The isoelectric point regulator is added in the aluminum oxide preparation process, and corresponding surface treatment methods such as alkalization or acidification, irradiation and crystallization are combined, so that the hydroxyl group density on the surface of the formed aluminum oxide carrier can be greatly improved, and the active metal in the catalyst prepared based on the catalyst has the advantages of high dispersity and small particle size; and the utilization rate of active metal atoms can be greatly improved.

Inorganic oxide particles having a D50 of 5.5-9.0 μm and a pressure loss of 1.75-2.81 kPa in air permeation at a pressure of 12 kPa.

A powder for additive manufacturing which is an inorganic oxide powder, wherein D10 is 1.0 to 4.0 μm, D50 is 5.5 to 9.0 μm, D90 is 20.0 to 40.0 μm, and the volume ratio of particles having a particle size of 16.8 to 60.0 μm is 15.0 to 22.0 vol %.

Disclosed are a positive electrode lithium supplementing additive, and a preparation method therefor and an application thereof. The positive electrode lithium supplementing additive includes a core body and a compact packaging layer covering the core body. The core body has a lithium-rich lithium supplementing material, and the material of the compact packaging layer has an inorganic aluminum compound. The positive electrode lithium supplementing additive in the present application has high compactness because of the compact packaging layer, and is high in lithium ion fall-off rate and lithium ion conductivity and low in residual alkali content, and thus has excellent lithium supplementing effect, lithium supplementing stability, and processing performance. In addition, by using the preparation method for the positive electrode lithium supplementing additive, structure and electrochemical performance stability of the positive electrode lithium supplementing additive prepared can be ensured, production efficiency is high, and production costs can be saved.

The invention discloses porous alumina powder as well as a preparation method and application thereof. The specific surface area of the porous alumina powder is 10m < 2 > / g-50m < 2 > / g, the particle size range is 300nm-2000nm, the aperture range is 1nm-80nm, and the surface free energy is 30mN / m-45mN / m. The performance of aluminum oxide is optimized by selecting a specific particle size range, a specific pore size range and a specific surface area, and it is required that the aluminum oxide contains a porous structure, overexposure of unsaturated aluminum ions on the surface needs to be reduced, that is, the surface free energy needs to be controlled, so that the aluminum oxide has high hydroxyl adsorption capacity, the absorption rate on a polar solvent is increased, and the service life of the aluminum oxide is prolonged. And meanwhile, the adsorption capacity of hydroxyl is not suitable to be too strong, so that the storage and the use are not influenced. Therefore, when the aluminum oxide with the structure is used for coating the diaphragm, the liquid absorption and liquid retention capabilities of the diaphragm are remarkably improved, and the comprehensive performance of the battery diaphragm is improved.

The invention belongs to the technical field of catalyst carriers, and particularly relates to a preparation method of a super-macroporous residual oil hydrodemetallization tooth spherical alumina carrier. Aluminum hydroxide and deionized water are mixed and peptized, a modifier is added to regulate and control the pore structure of the aluminum hydroxide, a pore-enlarging agent and a sintering aid are added into a muddy material, and uniformly-distributed pore structures can be formed in an alumina carrier under the action of the pore-enlarging agent and the sintering agent in the roasting process, so that the pore-enlarging effect of the alumina carrier is improved; and the pore structure is further expanded through roasting, so that the pore volume and the macropore ratio in the alumina carrier are improved. In addition, hydroxyl groups on the surface of the alumina carrier are subjected to condensation reaction in the roasting process, so that the acidity of the carrier is effectively reduced, and the corresponding catalytic performance is improved.

The invention relates to Bayer stone as well as a preparation method and application thereof, and belongs to the technical field of preparation of aluminum oxide or aluminum oxide precursor materials. The method comprises the following steps: mixing a Bayer stone seed crystal with an acidic aluminum source to obtain a first mixed solution; carrying out a neutralization reaction on the first mixed solution and sodium metaaluminate, and controlling the end point pH of the neutralization reaction to generate Alx (H2O) y (OH) mn < + > small clusters, so as to obtain a second mixed solution; and aging the second mixed solution at a set temperature, so that the Alx (H2O) y (OH) mn < + > small clusters are converted into a Bayer stone phase, and Bayer stone is obtained. The Bayer stone prepared by the invention meets the following indexes: the specific surface area is 325.3 m < 2 > / g to 382.3 m < 2 > / g, and the crystalline phase weight of the Bayer stone is 91.2 to 97.2 percent.

The present invention relates to a method for recycling secondary aluminum ash and its application, wherein the method comprises the following steps: S1, pre-treating the secondary aluminum ash by heating and washing, then mixing it with ammonium sulfate, roasting and water-immersing it to obtain a leachate, then cooling and crystallizing the leachate, separating the solid, and calcining it to obtain aluminum oxide; S2, hydroxylating the aluminum oxide to obtain hydroxylated aluminum oxide; S3, blending the hydroxylated aluminum oxide with carboxymethyl cellulose, and reacting it by ultrasonic heating to obtain modified aluminum oxide. The present invention improves the dispersibility, compatibility and stability of the modified aluminum oxide in composite materials while efficiently recycling the secondary aluminum ash, and can significantly improve product performance by using it as a filler in the fields of polymer materials and the like.

A method of processing size-reduced battery materials comprising aluminum, copper and black mass, may include: subjecting the size-reduced battery materials to a caustic leaching process to yield a pregnant leach solution; physically separating the pregnant leach solution into oversized solids and a screened leach stream, the oversized solids being rich in copper; and filtering the screened leach stream to yield a filter cake that is rich in black mass, and a filtered leach stream that is rich in aluminum.

The invention provides a preparation method of pseudo-boehmite with high bulk specific gravity, and belongs to the field of pseudo-boehmite. The method comprises the following steps: carrying out a low-temperature neutralization reaction on an aluminum salt solution and a sodium metaaluminate solution, and keeping the pH value of a neutralized material at 6-6.5 in the reaction process to obtain amorphous precursor slurry; carrying out solid-liquid separation on the amorphous precursor slurry to obtain first mixed slurry; performing high-temperature aging crystal transformation reaction on the first mixed slurry and sodium carbonate to obtain macroporous pseudo-boehmite slurry; performing solid-liquid separation on the macroporous pseudo-boehmite slurry to obtain second mixed slurry; carrying out modification treatment on the second mixed slurry and acid or acid aluminum salt so as to re-agglomerate the non-peptized macroporous pseudo-boehmite to obtain third slurry; performing solid-liquid separation on the third slurry to obtain fourth mixed slurry; and carrying out spray drying on the fourth mixed slurry to obtain the pseudo-boehmite. Therefore, the bulk density of the pseudo-boehmite is improved.

The present application provides a method for preparing battery-grade lithium carbonate from clay-type lithium ore, and relates to the field of resource utilization of clay-type lithium ore. The method for preparing battery-grade lithium carbonate from clay-type lithium ore includes: roasting, leaching, and deironing the clay-type lithium ore to obtain a deironed solution; mixing the deironed solution with an inorganic base to react to obtain a lithium-containing aluminum hydroxide precipitate adsorbent; performing lithium-aluminum separation on the lithium-containing aluminum hydroxide precipitate adsorbent to obtain aluminum oxide powder and a lithium-containing solution; performing calcium and magnesium removal treatment on the lithium-containing solution and concentrating it into a lithium-rich solution; deeply purifying and removing impurities from the lithium-rich solution to obtain a purified lithium-rich solution; reacting the purified lithium-rich solution with sodium carbonate to obtain battery-grade lithium carbonate. The present application can make full use of the lithium resources in the clay-type lithium ore, with a high resource utilization rate of lithium, and can produce high-value-added battery-grade lithium carbonate. The present application can also make full use of the aluminum resources in the clay-type lithium ore to produce high-grade alumina products as a by-product.

The invention discloses a modification method and application of a modified amorphous alumina defluorination adsorbent, and belongs to the technical field of adsorption materials. A modification method of a modified amorphous alumina defluorination adsorbent comprises the following steps: (1) preparation of a precursor: dissolving an aluminum salt with a solvent, adding a regulator, uniformly stirring, and carrying out solvothermal reaction in a reaction kettle with a polytetrafluoroethylene lining to obtain the precursor; (2) preparation of amorphous alumina: calcining the precursor in a muffle furnace to obtain amorphous alumina AlOx; and (3) modifying the amorphous alumina: adding the amorphous alumina into the modifier solution, stirring, standing, filtering and drying to obtain the amorphous alumina. The method is easy and convenient to operate, low in cost, suitable for large-scale production, environmentally friendly and free of pollution, and the modified aluminum oxide is higher in adsorption activity and has excellent regeneration performance.

Ultrafast flash evaporation joule heating synthesis methods and systems, more particularly, ultrafast synthesis methods for recovering metals from ores, fly ash, and bauxite residue (red mud).

A powder for additive manufacturing which is an inorganic oxide powder, wherein D10 is 1.0 to 4.0 μm, D50 is 5.5 to 9.0 μm, D90 is 20.0 to 40.0 μm, and the volume ratio of particles having a particle size of 16.8 to 60.0 μm is 15.0 to 22.0 vol %.

The invention discloses pure inorganic stimuli-responsive sol as well as a preparation method and application thereof, inorganic sol with stimuli-responsive performance is prepared from an inorganic nano-material with positive electricity, and the technical problem of conversion from one-dimensional inorganic nano-material sol to gel is solved. Compared with a means of providing positive electricity for the one-dimensional inorganic nano material through a modification means, the one-dimensional inorganic nano material carrying the positive electricity only needs cheap inorganic matters in cost, and the convenience and cost of the one-dimensional inorganic nano material carrying the positive electricity have qualitative changes in further processing and practical application; the adjustment of the acting force between one-dimensional inorganic nano materials can be realized without replacing ligands, and the method has extremely high advantages in the aspect of realizing the sol-gel conversion capability of stimulation response. The method disclosed by the invention is relatively low in cost and simple and convenient to operate, and the prepared hydrogel not only has relatively good mechanical properties, but also has relatively good stimulation response capability, is a material capable of realizing comprehensive application, and is wide in application scene.

The invention relates to the field of inorganic material preparation, and particularly discloses pseudo-boehmite and a preparation method thereof. A preparation method of pseudo-boehmite comprises the following steps: (1) mixing an aluminum salt solution and an aluminate solution, adding a crystal form regulating agent, and stirring for reaction to obtain a sol system; the crystal form regulating agent is ZnS quantum dots modified by thiohydracrylic acid; (2) adding a pore diameter guiding agent into the sol system, and aging for 6-8 hours; the pore diameter guiding agent is a compound of a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer and sodium citrate; and (3) carrying out solid-liquid separation on the aged sol system, and washing and drying the obtained solid to obtain the pseudo-boehmite. The proportion of 5-10nm pores of the pseudo-boehmite prepared by the preparation method disclosed by the invention reaches 90% or above, so that the pore distribution requirement of a fine catalytic reaction on the pseudo-boehmite can be met, and the efficient catalytic reaction is favorably realized.

The invention belongs to the technical field of inorganic powder, and discloses low-radioactivity spherical aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: adopting ultrapure water at 20-60 DEG C, and adding acid to adjust the pH value to be less than or equal to 2.5 to obtain acid liquor; taking aluminum hydroxide / boehmite / industrial alumina as raw materials, adding the raw materials into the acid liquor, and stirring and dispersing to obtain mixed slurry A; adding alkaline anion exchange resin into the mixed slurry A, carrying out hydrothermal stirring treatment for 8-12 hours, and removing the alkaline anion exchange resin to obtain mixed slurry B; carrying out suction filtration and drying on the mixed slurry B, and carrying out heat preservation treatment on the dried material at 1300-1400 DEG C for 6-9 hours; and S4, crushing and dispersing the material subjected to heat preservation treatment in the step S4, and melting and spheroidizing at 1100-1300 DEG C to obtain a low-radioactivity spherical aluminum oxide crude product. The prepared low-radioactivity spherical alumina powder is compact in structure, high in thermal conductivity, low in uranium content and suitable for EMC production and application.

Disclosed are an alumina porous material and its preparation and application. The porous material has substantially orderly distributed spherical or quasi-spherical cavities inside, the cavities have an average diameter of 100-500 nm, and at least a part of adjacent cavities are connected through mesopores. The alumina porous material is suitable for being used as a support for preparing a heavy residue hydroprocessing catalyst, or as a support for catalysts used in other macromolecular catalytic processes.

The invention provides a comprehensive utilization method of clay type lithium ore, and relates to the field of hydrometallurgy. The comprehensive utilization method of the clay type lithium ore comprises the following steps: mixing the clay type lithium ore with concentrated sulfuric acid, and carrying out low-temperature roasting at the temperature of 100-300 DEG C to obtain a roasted cured material; adding water into the roasted and cured material, leaching, and carrying out solid-liquid separation to obtain a lithium-rich aluminum leaching solution; adsorbing the lithium-rich aluminum leaching solution by using an aluminum ion sieve adsorbent to obtain an aluminum-rich adsorbed solution and a lithium-loaded ion sieve; analyzing the lithium-loaded ion sieve to obtain a lithium-rich desorption solution; the lithium-rich desorption solution is sequentially subjected to purification and lithium precipitation, and battery-grade lithium carbonate is obtained; sequentially carrying out iron removal, purification and impurity removal on the aluminum-rich adsorption post-liquid to obtain iron slag and an aluminum sulfate solution; and sequentially carrying out aluminum precipitation and roasting on the aluminum sulfate solution to obtain the metallurgical-grade aluminum oxide. The method has the advantages of high-efficiency leaching of lithium and aluminum, high-efficiency separation of lithium and aluminum, environment friendliness, simple process and the like.

The invention discloses a method for comprehensively recycling electrolytic aluminum carbon residues, and relates to the technical field of comprehensive recycling of waste materials. The method for comprehensively recycling the electrolytic aluminum carbon residues comprises the following steps of: breaking the carbon residues into 0.1-1cm particles by a hammer, carrying out wet ball milling under the condition of adding a flotation agent, and separating carbon powder on the upper layer and gray regenerated cryolite on the bottom layer of slurry through flotation equipment, wherein the fineness is 40-100 meshes, and the carbon content is less than 1%; the preparation method comprises the following steps: adding water into cryolite to prepare slurry, adding calcium oxide or calcium hydroxide, heating, stirring and reacting for 1-3 hours, and carrying out filter pressing to obtain filtrate and filter residues which are calcium fluoride and a sodium metaaluminate solution; the purity of the calcium fluoride powder is greater than 85%; and introducing hydrochloric acid into the filtrate, stirring and adjusting the pH to 7-9 to obtain aluminum hydroxide slurry, filtering and washing to obtain aluminum hydroxide, and drying to obtain the aluminum hydroxide with the purity of more than 95%.

The invention discloses porous alumina as well as a preparation method and application thereof, and relates to the technical field of porous materials. The preparation method comprises the following steps: firstly, carrying out hydrothermal reaction on aluminum hydroxide slurry containing aluminum hydroxide, aluminum oxide seed crystal and a dispersing agent, enabling porous aluminum oxide precursor slurry obtained by the hydrothermal reaction to be in an alkaline environment, adjusting the pH value of the slurry to 7.0-8.5 through acid adjustment, and then carrying out solid-liquid separation, calcination and other processes. Aluminum ions in the solution can be washed away in the solid-liquid separation (such as filter pressing) process through the acid adjusting process, large-particle single crystals in the porous aluminum oxide precursor are reduced, the obtained porous aluminum oxide precursor is uniform in crystal size, and the monodisperse porous aluminum oxide precursor is prepared through the synthesis section. And after subsequent calcination, the morphology is regular, the particle size distribution is narrower, and the monodisperse porous alumina powder can be obtained only through agglomeration formed by ultrafine scattering and calcination of the jet mill.

The invention relates to the technical field of suspension roasting, in particular to a flowing suspension roasting system and method for desiliconizing and purifying coal gangue. The system comprises a multi-stage preheating unit, a multi-stage cooling unit, a flowing suspension roasting furnace and a crystal form control device which are connected in sequence, and the method comprises the steps that coal gangue materials are subjected to multi-stage preheating, so that the materials are heated in stages; performing high-temperature roasting in a flowing suspension roasting furnace, and controlling the retention time of the material and the environment temperature in a crystal form control device so as to regulate and control the crystal form structure of the material. By accurately controlling the roasting process and optimizing material crystal form transformation, efficient removal of silicon in the coal gangue and efficient extraction of aluminum oxide are achieved, and the method has the advantages of being low in energy consumption, high in efficiency and good in environment friendliness and is suitable for large-scale industrial production.

The invention relates to a comprehensive utilization major cycle process in cooperative treatment of industrial flue gas pollutants, which comprises the following steps: removing SO2 and NOx in flue gas by adopting an adsorption method, and desorbing SO2 and NOx by adopting a water solution method to generate sulfuric acid and nitric acid; sulfuric acid reacts with sodium chloride to produce hydrochloric acid; sulfuric acid, nitric acid and hydrochloric acid are combined into a composite acid solvent, the solvent dissolves aluminum oxide in the fly ash to be converted into polybasic acid aluminum, the polybasic acid aluminum is subjected to ammonification decomposition into aluminum hydroxide and composite acid ammonium, the composite acid ammonium reacts with calcium carbonate to generate NH3, CO2 and polybasic acid calcium, and the polybasic acid calcium reacts with sodium sulfate to generate nano calcium sulfate; the method comprises the following steps: reacting silicon dioxide with sodium hydroxide to generate sodium silicate, reacting sodium silicate with sodium bicarbonate to generate silicic acid and sodium carbonate, reacting sodium carbonate with calcium hydroxide to generate calcium carbonate and sodium hydroxide, and mixing multi-element metal oxide separated from aluminum and silicon extraction with silicon dioxide and aluminum hydroxide which are separated and carried to prepare a multi-element cation molecular sieve; and comprehensive utilization and large circulation of the flue gas pollutants are realized through the synergistic effect of the pollutants.

A thermally conductive filler includes: coarse inorganic particles; and the small inorganic particles, wherein the coarse inorganic particles includes large fused alumina particles having an average particle size in the range of 20 μm or more and 50 μm or less and the medium inorganic particles having an average particle size in the range of 1.0 μm or more and 10 μm or less, in a mass ratio of 60:40 to 100:0, the small inorganic particles have an average particle size of 0.1 μm or more and less than 1.0 μm, and a content of the small inorganic particles is in a range of 15% by mass or more and 30% by mass or less.