9 results about "Hydrated alumina" patented technology

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 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.

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.

Electromagnetic wave absorbing composite material, its manufacturing process and its uses. Electromagnetic wave absorbing composite material, said composite material consisting of a support matrix formed of cork grains which are coated by an electromagnetic wave absorbing material and which are linked to each other by a resin, characterized by the fact that trihydrated alumina (ATH) is trapped in said resin.

The application discloses a method for extracting lithium in hydrothermal preparation of boehmite from lithium-containing aluminum hydroxide, and the method comprises the following steps: hydrothermally treating the lithium-containing aluminum hydroxide with an acidic solution to realize extraction of lithium elements and preparation of lithium carbonate, and simultaneously, aluminum elements are directly converted into boehmite through hydrothermal separation. Compared with the traditional acid leaching method for adjusting pH and segmenting precipitation, the method has the advantages of lower acid consumption, no need for secondary separation of aluminum gel in the leaching solution, and a more simple operation process, and can directly prepare sheet-shaped boehmite with uniform morphology and excellent crystallinity, and effectively avoids the loss of lithium elements caused by aluminum-lithium co-precipitation in the traditional process. Compared with the conventional hydrothermal leaching process, the lithium extraction rate of the method can reach more than 95%, and the boehmite can be directly used as a finished product, and there is no need to return the hydrated aluminum oxide obtained through the conventional hydrothermal method to the system for processing after being resolubilized into sodium aluminate solution. The method has the advantages of significantly reduced energy consumption, simplified process links, and outstanding industrial application value.

This invention discloses a coating process for high-weather-resistant and high-gloss coatings using doped titanium dioxide, belonging to the field of titanium dioxide processing technology. The process includes the following steps: Step 1: Select rutile titanium dioxide as a raw material, mix it with water and a dispersant to form a slurry, and then grind it to obtain a homogeneous titanium dioxide slurry. This invention utilizes the dual effects of "fluorine doping passivation + double-layer barrier isolation" to fundamentally inhibit the photocatalytic activity of TiO₂. The inner layer of fluorine-doped hydrated alumina captures photogenerated electrons by forming [Al–F] bonds, while the outer layer of highly crystalline hydrated alumina provides a physical isolation barrier. The synergistic effect of these two layers improves weather resistance by more than 40%. Precise control of the film thickness (total coating amount <3%) avoids light scattering loss caused by excessive coating. The outer layer of highly crystalline Al(OH)₃ particles has good optical matching properties, ensuring a coating gloss ≥90% (60°) and a gloss retention rate ≥90% after aging. The steric hindrance effect formed by the double-layer coating structure significantly reduces the tendency for particle agglomeration.