62 results about "Hydrated alumina" patented technology

The invention relates to a paper-plastic-aluminum packaging waste resource utilization system and method.The system comprises a water supply unit, a material pretreatment unit, a reactor, an electromagnetic induction heater and a three-phase separator, the water supply unit is connected with the reactor, and the material pretreatment unit is connected with a feeding port of the reactor; a condensing coil is arranged in the reactor and is communicated with a water supply unit to form a cooling water supply loop; the electromagnetic induction heater is arranged at the middle lower part of the reactor; and a feed port of the three-phase separator is connected with a discharge port of the reactor. According to the system, the paper-plastic-aluminum packaging waste is treated by utilizing a hydrothermal liquefaction method, so that in-situ online synthesis of high-quality bio-oil is realized, and hydrated alumina with high additional value is recycled; the resource utilization efficiency is obviously improved while the energy consumption and the pollution emission are reduced. The method is green and environment-friendly, the use of an organic solvent or a high-acidity separating agent in a traditional recovery method is avoided, and secondary pollution is reduced; the by-product hydrogen can be used as clean energy, and carbon emission is reduced.

The application discloses a roving plastic polypropylene composition and a preparation method thereof, and belongs to the technical field of the roving plastic process.The composition comprises the following components in parts by weight: 100 parts of polypropylene, 0.2-0.6 parts of an antioxidant, 0.02-0.1 parts of an acid absorbent, 0.05-2 parts of a lubricant and 0.2-0.8 parts of hydrated aluminum oxide.The polypropylene, the antioxidant, the acid absorbent and the lubricant A are uniformly mixed;the lubricant B, the hydrated aluminum oxide and a coupling agent are uniformly mixed after being added into anhydrous ethanol;the remaining polypropylene and the above-mentioned materials are uniformly mixed, are melt-kneaded in a same-direction double-screw extruder and are extruded and granulated;and the granulated material is ground into fine powder to obtain the roving plastic polypropylene composition.The application solves the multiple problems of resin grinding, antioxidation and bubble discharge in the application of the polypropylene in the roving plastic process field.The prepared roving plastic polypropylene composition has less bubbles and superior mechanical properties;and the preparation method is simple, reliable and easy to implement.

A non-foaming aqueous composition is applied to a fabric substrate to provide a non-foaming light-attenuating coating in the resulting coated fabric substrate that produces reduced outdoor light glare. The non-foaming aqueous composition has 5-50% solids and a zero shear viscosity of 100-1000 mPa-sec at 25°C. The composition has: i) 0.1-20 wt% of porous particles, and optionally an opaque colorant; ii) 4-20 wt% of a film-forming binder material that includes at least a chlorinated polymer; iii) 2-12 wt% of a white inorganic particulate filler material having a refractive index (RI) greater than 2 and a median particle size less than 1 pm; and iv) 5-16 wt% of a white low-density particulate hydrated alumina having a median particle size less than or equal to 3 pm. The non-foaming aqueous composition can be applied to a fabric substrate to reduce outdoor light glare without changing indoor light tinting and light blocking properties.

The invention relates to a low-carbon alkane dehydrogenation olefin preparation catalyst, which comprises an alumina carrier and an active component, and is characterized in that the alumina carrier is a millimeter-scale sulfur-containing theta-alumina pellet, the particle size is 1.6-2.5 mm, the specific surface area is 80-150m < 2 > / g, the pore volume is 0.40-0.75 mL / g, the crushing strength is greater than 50N / pellet, the bulk density is 0.55-0.80 g / mL, the length-diameter ratio b / l value is more than 0.95, and the sulfur content is 0.05-0.50%. The theta-alumina pellets are prepared by the following steps: adding an acid solution into an alumina suspension of at least two kinds of hydrated alumina, wherein the acid peptizing index DI of at least one kind of hydrated alumina is 50-85%, peptizing to obtain alumina sol, then dropwise adding the alumina sol into an oil ammonia column through a dropper, pelletizing, drying and roasting. When the catalyst is used for an alkane dehydrogenation reaction, the alkane conversion rate and olefin selectivity are high, and the carbon deposition resistance is strong.

The invention belongs to the technical field of novel refractory materials, and particularly relates to a low-dimensional mullite phase reinforced silicon carbide-aluminate refractory product and a preparation method thereof. The low-dimensional mullite phase enhanced silicon carbide-aluminate refractory product is prepared from the following raw materials in percentage by mass: 50 to 85 percent of aggregate, 6 to 35 percent of matrix, 1 to 10 percent of binding agent, 0.1 to 6 percent of additive and water reducing agent which accounts for 0.1 to 1 percent of the total mass of the raw materials, the binding agent is hydrated alumina (rho-Al2O3), and the additive is at least one of ammonium molybdate, boric oxide, aluminum fluoride, silica powder, tungsten oxide and molybdenum oxide. According to the invention, a hydrated alumina binding agent and an additive have a synergistic effect, and a low-dimensional mullite phase is catalytically generated through staged temperature-controlled sintering in a buried carbon atmosphere. The problems that a silicon carbide-aluminate refractory material is poor in interface bonding property, low in strength, easy to oxidize at high temperature, water-oxygen corrosion, high in heat conductivity and the like are solved.

Provided herein are methods and systems for producing alumina trihydrate (Al(OH)3) and / or alumina (Al2O3). The methods and systems utilize energy extracted from the aluminum-water reaction to power the conversion of various aluminum sources to alumina trihydrate.

The invention discloses pomegranate-like porous pelelith lightweight aggregate and a preparation method thereof, and relates to the technical field of artificial lightweight aggregate for building materials. Natural porous pelelith is adopted as a raw material, the surface of the porous pelelith is coated with a layer of gelling slurry such as ordinary Portland cement, calcium sulphoaluminate cement, aluminoferrite cement, calcium aluminate cement, hydratable alumina and metakaolin, and then sufficient curing and drying are performed to prepare the pomegranate-like porous pelelith lightweight aggregate. The lightweight aggregate has a compact cementing material coating layer and a porous core structure, has the advantages of low density and relatively high strength, and can effectively solve the technical problem of high water absorption of natural porous pelelith; and the preparation process is simple, high-temperature sintering is not needed, the energy-saving advantage is obvious, and industrial production is easy.

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 relates to the technical field of coatings, and discloses a preparation method of a spherical alumina-cordierite composite refractory coating composition, which comprises the following steps: uniformly stirring and mixing 100 parts by weight of epoxy resin, 1-5 parts by weight of amino-terminated polymer ultraviolet absorbent, 15-28 parts by weight of filler spherical alumina trihydrate and cordierite, 29-32 parts by weight of curing agent and the like; the spherical aluminum oxide-cordierite composite fireproof coating composition is obtained. The polymer ultraviolet absorbent contains an o-hydroxybenzotriazole group, so that the ultraviolet absorption characteristic and the ultraviolet aging resistance of the coating can be improved, and the polymer as the absorbent contains a biphenyl structure with thermal stability, so that the thermal decomposition temperature, the heat resistance and the water resistance and water resistance can be improved after the polymer is co-cured with the epoxy resin. Meanwhile, spherical alumina trihydrate and cordierite are added, so that the limit oxygen index of the coating is increased, and the flame-retardant and fire-resistant performance is improved.

Processes for producing a precipitated aluminum trihydrate (ATH) product from scrap or waste aluminum metal include the steps of contacting the aluminum metal with an activating composition containing gallium and / or indium to form an activated aluminum composition, reacting the activated aluminum composition with water and an ionic salt, a hydroxide, and / or an acid to form hydrogen gas and a first reaction mixture comprising solid ATH and a first solid fraction, isolating the solid ATH and the first solid fraction from the first reaction mixture, contacting the solid ATH and the first solid fraction with an aqueous caustic solution to form a second reaction mixture containing dissolved sodium aluminate, removing a second solid fraction from the second reaction mixture to form a liquor solution, seeding the liquor solution with a seed material to precipitate ATH and form a suspension, isolating precipitated ATH from the suspension and washing the precipitated ATH to form an intermediate ATH product, optionally milling the intermediate ATH product, and drying the intermediate ATH product to form the precipitated ATH product. Concurrently with the production of ATH is the production of molecular hydrogen and significant amounts of heat / energy.

The invention relates to a preparation method of amorphous hydrated alumina, and belongs to the technical field of inorganic materials. According to the method, hydrated alumina is taken as a raw material, and the hydrated alumina is converted into amorphous hydrated alumina by directly destroying a crystal structure in a ball-milling process by regulating and controlling mechanical ball-milling time under the condition of not adding a chemical additive or carrying out solution treatment. The method is easy and convenient to operate, raw materials are common, and the complex steps of sol-gel, hydrothermal reaction, template construction and the like commonly used in traditional amorphous material preparation are remarkably simplified. Through structural characterization, the obtained product has obvious amorphous characteristics, has good structural uniformity and high reaction activity, and is suitable for subsequent synthesis and functional development of various aluminum oxide materials. The process is mild in condition, environment-friendly, easy to realize industrial amplification and good in popularization and application prospect.

The invention discloses emulsion with a stable thickening agent and application of the emulsion to production of aluminum oxide through the Bayer process, and relates to the technical field of emulsion, the emulsion comprises an oily chemical, the thickening agent, water and an emulsifying agent, the oily chemical is a crystal growth auxiliary CGM used in production of aluminum oxide through the Bayer process, the thickening agent is a substance capable of increasing the viscosity of a water phase, and the emulsifying agent is an emulsifier capable of increasing the viscosity of the water phase. The emulsifier is a surfactant. According to the stable emulsion of the thickening agent and the application of the stable emulsion in production of aluminum oxide by a Bayer process, the thickening agent can realize uniform dispersion of oily CGM without a large amount of emulsifier by increasing the aqueous phase viscosity stable emulsion, the interference of the traditional emulsifier on the coarsening performance of the CGM is avoided, and the application effect of the stable emulsion is superior to that of the traditional emulsion and even exceeds that of the oily CGM; and the proportion of particles larger than 45 microns in the alumina trihydrate particles can be effectively increased.

A preparation method for the carrier, includes: 1) mixing hydrated alumina with an organic acid to obtain a mixture A; and 2) adding tetraalkylsiloxane to the mixture A, thus obtaining a mixture B; stirring the mixture B in a closed condition; spraying atomized water into the mixture B; and stirring to yield the carrier.

A readily soluble alumina and a method for preparing the same involve: mixing an aluminum hydroxide and a sodium aluminate solution to obtain an aluminum hydroxide slurry; performing a high-temperature reaction on the aluminum hydroxide slurry to obtain an alumina hydrate; and performing a low-temperature calcination on the alumina hydrate to obtain a readily soluble alumina.

The invention belongs to the technical field of ceramic abrasive manufacturing, and particularly relates to a preparation method of modified aluminum sol for a ceramic abrasive. The method comprises the following steps: (1) mixing deionized water and hydrated alumina, uniformly stirring, adding a crystal form control agent and a surfactant, adding a coloring agent, a modifier and an adhesive, and uniformly stirring to obtain homogeneous slurry; and (2) adding a rare earth stabilizer into the homogenized slurry obtained in the step (1), then adding a nitric acid solution, homogenizing into transparent colloid, standing for 20-24 hours, dishing the precipitated colloid, drying, crushing and sieving to obtain the modified aluminum sol. The stabilizer and the modifier are added in the form of sol and are subjected to homogeneous reaction with the aluminum sol, so that the molecular weight distribution is more uniform, the particle size is smaller, and the distribution is narrower.

A non-foamed aqueous composition can be applied to fabric substrates to provide non-foamed light-attenuating coatings in resulting coated fabric substrates that produce reduced glare from incident outside light. The non-foamed aqueous composition used to make these coated fabric substrates has a 5-50% solids and a zero shear viscosity of 100-1000 mPa-sec at 25° C. This composition has components i) through iv): i) porous particles at 0.1-20 weight %, and optionally an opacifying colorant; ii) a film-forming binder material comprising at least a chlorinated polymer at 4-20 weight %; iii) a white inorganic particulate filler material having a refraction index (RI) greater than 2 and a median particle size of less than 1 μm, at 5-16 weight %; and iv) a white low-density particulate hydrated alumina having a median particle size of less than or equal to 3 μm, at 2-16 weight %.

The application discloses an alpha-alumina carrier and a preparation method of the alpha-alumina carrier and a silver catalyst. The preparation method of the alpha-alumina carrier comprises the following steps: (1) preparing "non-flaky" alpha-Al2O3 seeds; (2) mixing the seeds obtained in the step (1), hydrated alumina, an additive and an F-containing inorganic salt according to the mass ratio of (1.5-3):100:(0.1-0.3):(1-3); (3) adding a binder with a mass concentration of 25%-45% and an extrusion aid, continuously mixing and forming into particles according to the mass ratio of the mixture in the step (2):the binder:the extrusion aid=100:(25-45):(8-12), and drying and calcining to obtain the alpha-alumina carrier. The alpha-alumina carrier prepared by the application has the advantages of "non-flaky" and "flaky" micro-morphologies, the silver catalyst prepared by the alpha-alumina carrier has the performance advantages of the catalysts prepared by the two kinds of micro-morphology carriers, and the silver catalyst has good stability.

The application discloses a preparation method of an alpha-alumina carrier, which comprises the following steps: a) dry mixing alpha-Al2O3 seed crystals in a "platelet" shape with hydrated alumina, an inorganic compound containing B and an additive to obtain a dry powder mixture, wherein the additive is an inorganic compound containing one or more of Ca, Sr, Ba, Si, Zn, Zr and Y; b) adding a binder and an extrusion aid to the dry powder mixture to continue wet mixing, and then performing shaping, drying and calcination to obtain the alpha-alumina carrier. The alpha-alumina carrier with both "non-platelet" and "platelet" micro-morphologies can be prepared by the method.

The invention belongs to the technical field of high-aluminum castable, and discloses a cement-bonding-free high-aluminum castable and a preparation method thereof. The cement bonding-free high-aluminum castable comprises the following raw materials in percentage by mass: 63-74% of high-aluminum aggregate particles, 21-30% of fine powder, 4-8% of a binding agent and water which accounts for 2-4% of the total mass of the raw materials, wherein the fine powder is a mixture of aluminum oxide micro powder and silicon dioxide micro powder, and the binding agent is obtained by mixing sodium tripolyphosphate modified silicon dioxide micro powder with boehmite micro powder, hydratable aluminum oxide micro powder, boric acid micro powder, acrylamide micro powder, vanadium pentoxide micro powder and water and then carrying out heating reaction. The high-aluminum castable without cement bonding is low in water demand, good in fluidity, long in construction time, excellent in green body strength, medium-temperature strength and high-temperature strength, and good in anti-cracking, thermal shock resistance and erosion resistance, so that the construction quality and the service life of the high-aluminum castable are ensured.

The application provides an alumina carrier and a preparation method and application thereof, and the preparation method comprises the following steps: step 1, subjecting isobutene-maleic anhydride copolymer to an ammonolysis reaction; step 2, mixing the mixture obtained in step 1 with hydrated alumina; step 3, mixing the mixture obtained in step 2 with an aqueous crosslinking agent solution, shaping, drying, and calcining to obtain the alumina carrier. The preparation method is simple, low in cost, and friendly to the environment in the preparation process, and the prepared alumina carrier has a large pore size and pore volume and high mechanical strength. The prepared alumina carrier can be used for a residual oil hydroprocessing active protective agent and a hydrodemetallization catalyst.

The invention discloses a preparation method of boehmite hydrated alumina nanocrystals based on pH gradient regulation and control, and relates to the field of preparation of inorganic non-metallic materials. Aiming at the problems of non-uniform particle size, high cost and difficulty in industrialization of boehmite caused by single pH regulation and control in the prior art, the method comprises the steps of precursor pretreatment, three-stage pH gradient hydrothermal reaction and post-treatment, wherein a nonionic stabilizer is added in the pretreatment stage; the hydrothermal reaction is regulated and controlled in three stages of crystal nucleus induction, crystal growth and morphology stabilization; the post-treatment is matched with a dispersing and impurity removing process. The method does not need expensive raw materials, the prepared product is uniform in particle size, the purity is larger than or equal to 99.90%, the method is adaptive to conventional equipment, industrial mass production can be achieved, defects in the prior art are overcome, and the method is suitable for the fields of lithium battery diaphragm coatings and the like.

The present invention provides an α-alumina support, an α-alumina-based catalyst, and a preparation method and application thereof, comprising the following steps: (1) mixing a silicon-modified fiber material, hydrated alumina, a first auxiliary agent, and a fluorine-containing inorganic salt to obtain a mixture; wherein the mass components of each component are: 1000 parts of hydrated alumina, 1-3 parts of the first auxiliary agent, 15-35 parts of the silicon-modified fiber material, 10-30 parts of the fluorine-containing inorganic salt, and the first auxiliary agent comprises a compound of at least one element in Groups IIA, IVA, VIIA, IIB, IIIB, and IVB of the periodic table; (2) mixing and molding the mixture obtained in step (1), a binder, and an extrusion aid, and drying and calcining to obtain the α-alumina support; wherein the mass components of the mixture, the binder, and the extrusion aid are: 1000 parts of the mixture, 50-200 parts of the binder, and 5-20 parts of the extrusion aid. The α-alumina support provided by the present invention not only has high mechanical strength but also has pores that are not prone to shrinkage and have low tortuosity.

The application discloses a preparation method of a poor-quality residual oil hydrogenation demetallization catalyst, which comprises the following steps: mixing hydrated alumina, phenolic resin and a binder, adding a water solution containing low-carbon alcohol, and performing mixing, kneading, molding, drying and calcination to obtain an alumina carrier; dissolving metal compounds by using organic acid and hydrogen peroxide, adding a composite complexing agent, and preparing a metal impregnation solution; wherein the active metal compounds comprise metals of group VIII and group 6B; the specific surface area of the poor-quality residual oil hydrogenation demetallization catalyst is 80-180 m 2 / g, the pore volume is 0.5-1.1 cm 3 / g, and the proportion of the pore volume of the pore channel with a pore diameter greater than 100 nm to the total pore volume is ≮10%. In the application, the phenolic resin is used as a pore-expanding agent, is partially dissolved under the action of low-carbon alcohol, and forms a diffusion channel with a large pore of more than 100 nm in the alumina carrier after extension and crosslinking, so that the cost is low, the application has thermoplasticity and thermosetting property, is easy to be molded, and the carrier strength is high.

The present disclosure belongs to the technical field of separators. Disclosed are a separator and a preparation method therefor, and an electrochemical device. The separator comprises a bulk membrane and a composite material layer arranged on at least one side surface of the bulk membrane, wherein the composite material layer comprises inorganic particles and an inorganic binder; and the inorganic binder comprises a silicate, i.e., M2O·nSiO2, and / or an aluminum sol, i.e., a(Al2O3·mH2O)·bHx·cH2O, and / or a silica sol, i.e., SiO2·dH2O, where M comprises at least one of Na, K and Li, 1≤n≤4, Al2O3·mH2O is hydrated alumina, Hx is a peptizing agent, b is less than a, c and m, and 1≤d≤4. The separator not only has a relatively good peel strength, puncture strength, wettability and air permeability, but also has a good ionic conductivity, and can be used stably under high-temperature conditions for a long time; therefore, an electrochemical device comprising the separator can also work safely and efficiently under high-temperature conditions.

An article such as a conveyor belt includes an elastomeric composition containing a unique flame-retardant system that includes intumescent graphite along with other flame retardant(s) that cooperate in synergist effect to achieve certain flame resistance criteria while also providing suitable abrasion resistance. The flame retardants of the system may include halogenated compound(s) from 5 phr to 25 phr, antimony trioxide compound(s) from 1 phr to 15 phr, alumina trihydrate compound(s) from 2 phr to 25 phr, and intumescent graphite(s) from 1 phr to 10 phr. The flame retardants may cooperate in synergistic effect such that the cured elastomeric compound has (i) an afterglow value of less than 100 seconds in accordance with testing under ASTM D378 13.2 as associated with flame resistance; and (ii) a non-rotating DIN abrasion value of less than 150 mm3 according to DIN 53516, Method A as associated with abrasion resistance.

An article such as a conveyor belt includes an elastomeric composition containing a unique flame-retardant system that includes intumescent graphite along with other flame retardant(s) that cooperate in synergist effect to achieve certain flame resistance criteria while also providing suitable abrasion resistance. The flame retardants of the system may include halogenated compound(s) from 5 phr to 25 phr, antimony trioxide compound(s) from 1 phr to 15 phr, alumina trihydrate compound(s) from 2 phr to 25 phr, and intumescent graphite(s) from 1 phr to 10 phr. The flame retardants may cooperate in synergistic effect such that the cured elastomeric compound has (i) an afterglow value of less than 100 seconds in accordance with testing under ASTM D378 13.2 as associated with flame resistance; and (ii) a non-rotating DIN abrasion value of less than 150 mm3 according to DIN 53516, Method A as associated with abrasion resistance.

Alumina-lanthanum hexaluminate special heat-insulating refractory material and preparation method and application thereof relate to the field of heat-insulating refractory materials for high-temperature kiln lining.The present application uses tabular corundum fine powder, active alumina micro powder, lanthanum oxide micro powder and lanthanum aluminate micro powder with suitable particle size as raw materials, selects hydratable alumina as a binder, adds water to obtain a slurry by stirring; microspherical foam prepared by using animal protein foaming agent is added into the slurry as a pore-forming template, and the slurry is stirred, cast, maintained, demolded, dried and high-temperature sintered to obtain the alumina-lanthanum hexaluminate special heat-insulating refractory material. Compared with the existing porous heat-insulating materials, the alumina-lanthanum hexaluminate special heat-insulating refractory material has the advantages of high strength and low thermal conductivity, can be directly used as the working lining of high-temperature kiln, has obvious advantages of integration of structure and heat-insulating function, has high load softening temperature and low re-sintering shrinkage, and has a use temperature of up to 1800 DEG C. Compared with the existing alumina porous materials, the service life is increased by 3-5 times.

The present application relates to a kind of paper plastic aluminum packaging waste resource utilization system and method, its system includes water supply unit, material pretreatment unit, reactor, electromagnetic induction heater and three-phase separator, wherein water supply unit is connected with reactor, material pretreatment unit is connected with the feed inlet of reactor, condensing coil is arranged in the interior of reactor and is connected with water supply unit to form cooling water supply circuit, electromagnetic induction heater is arranged in the middle and lower part of reactor;The feed inlet of three-phase separator is connected with the discharge port of reactor.The system uses hydrothermal liquefaction method to process paper plastic aluminum packaging waste, realizes the in-situ online synthesis of high-quality bio-oil, and recycles high-value-added hydrated alumina;While reducing energy consumption and pollution emissions, resource utilization efficiency is significantly improved.The present application is green and environmentally friendly, avoids the use of organic solvents or high-acidity separating agent in traditional recycling methods, reduces secondary pollution;By-product hydrogen can be used as clean energy, and carbon emissions are reduced.