18 results about "Aluminium nitrate" patented technology

The invention discloses a method for preparing high-dispersion spherical alumina powder, which comprises the following specific steps: adding a certain proportion of aluminum sulfate octadecahydrate and aluminum nitrate nonahydrate into a three-neck flask at room temperature, adopting urea as a precipitator, uniformly stirring, heating in a water bath to a certain temperature, continuously stirring for a period of time to obtain a suspension, filtering the suspension, and drying to obtain the high-dispersion spherical alumina powder. And washing and spray-drying filter residues obtained by filtering, and calcining at high temperature to obtain the high-dispersion spherical aluminum oxide. The spherical aluminum oxide prepared by the method is excellent in dispersity, controllable in particle size, simple in process and high in production efficiency.

The invention discloses aluminum oxide-based high-dispersity grinding powder and a preparation method thereof, and relates to the technical field of aluminum oxide grinding powder. Comprising the following steps: step 1, adding aluminum chloride hexahydrate and aluminum nitrate nonahydrate into deionized water, adding a precipitator, a dispersant, ammonium fluoride and a functional additive, stirring at 85-95 DEG C for 3-4 hours, aging for 0.5-1.5 hours, washing and drying to obtain aluminum hydroxide powder; 2, grinding aluminum hydroxide powder and a sintering aid to obtain a raw material; and 3, calcining the raw materials in stages, and cooling to room temperature to obtain the high-dispersity grinding powder. The functional additive, the dispersing agent and other raw materials are combined with the sintering aid and a specific process to finally obtain the product; the system can effectively prevent carbonization of organic matters and inhibit abnormal growth of crystal grains, so that the dispersity and hardness of the product are remarkably improved while the crystal grain size of the product is controlled.

The invention discloses a low-carbon concrete nano C-A-S-H seed crystal enhancer as well as a preparation method and application thereof. The reinforcing agent comprises the following raw materials in parts by weight: 150-200 parts of water, 20-25 parts of sodium silicate nonahydrate, 15-20 parts of calcium nitrate tetrahydrate, 5-8 parts of aluminum nitrate nonahydrate, 1-4 parts of a polycarboxylate superplasticizer, 1-4 parts of sodium hydroxide, 0.5-2 parts of a silane coupling agent and 0.5-2 parts of a sodium polyacrylate dispersing agent. The preparation method comprises the steps of dissolution, precipitation reaction, dispersion modification and pH adjustment. According to the invention, by optimizing the molar ratio of silicon to aluminum and constructing a composite dispersion system, the technical problems of easy agglomeration, poor stability and poor compatibility with a water reducing agent of the nano seed crystal are solved. When 0.5-2% of the additive is applied to concrete, the early strength can be remarkably improved, the workability maintenance can be improved, the activity of solid wastes such as fly ash and the like can be effectively excited, and a key technical support is provided for preparing high-performance low-carbon concrete.

The invention provides an adsorbent for synchronously controlling indoor humidity and volatile organic pollutants, and a preparation method and application thereof, and belongs to the field of adsorption of pollutants in ambient air. The method comprises the following steps: dissolving aluminum nitrate, glycine and aminoterephthalic acid in a solvent, stirring and dissolving to obtain a solution A; adding sodium hydroxide into absolute methanol while stirring to obtain a solution B; dropwise adding the obtained solution B into the solution A in the step 1, and mixing and stirring to obtain a turbid solution C; pouring the obtained turbid solution C into a polytetrafluoroethylene reaction kettle, and then putting the polytetrafluoroethylene reaction kettle into a drying oven to obtain a turbid solution D; and carrying out centrifugal solid-liquid separation on the turbid solution D, pouring out the upper solution to obtain a bottom primary product, carrying out centrifugal cleaning on the primary product to obtain light red wet gel, and drying to obtain the adsorbent. The prepared adsorbent has the advantages of being simple in synthesis method and low in cost, synchronous adsorption control over humidity and volatile organic pollutants can be achieved, and rapid desorption regeneration and recycling can be achieved.

The application discloses a copper electrode zinc oxide varistor and a preparation method and application thereof, and relates to the technical field of varistor materials.The varistor disc preparation material is composed of zinc oxide, bismuth trioxide, nickel oxide, tricobalt tetroxide, manganese dioxide, boric acid, aluminum nitrate nonahydrate, antimony trioxide, yttrium oxide and chromium oxide, is subjected to ball milling mixing, granulation, compression molding, glue removal, sintering to obtain ceramic black sheets, and is subjected to copper electrode printing and burning and permeation in a nitrogen atmosphere to obtain a copper electrode varistor.The application effectively reduces the raw material cost under the premise of ensuring the quality of the grain boundary by replacing Sb2O3 with Y2O3, and simultaneously, the Cr 3+ The segregation at the grain boundary and the second phase precipitation form a grain boundary pinning effect, abnormal growth of ZnO grains is inhibited, and the grain size distribution is more concentrated.The application improves the nonlinear coefficient of the copper electrode varistor, reduces the leakage current and the residual voltage ratio, and the comprehensive electrical performance is excellent.

A method of preparing a Calcium-Aluminium-layered double oxide (CaAl-LDO)-doped biochar composite is provided. The method comprising providing a solution containing calcium nitrate and aluminium nitrate in a molar ratio of calcium nitrate to aluminium nitrate is 3:1, providing a pomace, providing an alkaline solution, mixing the pomace, the alkaline solution, and the solution containing calcium nitrate and aluminium nitrate, thereby to form a precipitate Calcium-Aluminium-layered double hydroxide (CaAL-LDH) on the pomace, and pyrolyzing or calcinating the mixture to prepare CaAL LDO-doped biochar composite. The pomace may be a natural pomace or pyrolyzed pomace. The (CaAl-LDO)-doped biochar composite may be used for removing phosphate-based impurities from water. The (CaAl-LDO)-doped biochar composite may adsorb up to 98% of phosphates from water.

The invention discloses an efficient wastewater treatment agent with a sodium sulfate recovery function and a preparation method thereof, and belongs to the technical field of wastewater treatment. Mixing ferric trichloride and ferrous chloride, stirring and reacting to obtain a ferroferric oxide carrier; a ferroferric oxide carrier, magnesium chloride and aluminum nitrate are mixed and subjected to a hydrothermal reaction to obtain a modified magnet; mixing the modified magnet and zirconium oxychloride to obtain a mixed system, adding 2-phosphonobutane-1, 2, 4-tricarboxylic acid into the mixed system, and carrying out stirring reaction to obtain a functional compound; dispersing calcium hydroxide in deionized water to obtain a first solution, and dispersing phosphoric acid in deionized water to obtain a second solution; mixing the functional compound, the first solution and the second solution, stirring and reacting, and calcining to obtain a first treating agent; calcium hydroxide and phosphoric acid are subjected to mixed reaction and high-temperature calcination to obtain a second treatment agent; the first treating agent and the second treating agent are combined for use to obtain the efficient wastewater treating agent.

The present invention discloses an apparatus for accelerating organic compound decomposition, based on photocatalyst comprising titanium dioxide (TiO 2) doped with copper (II) nitrate and / or zinc nitrate and / or aluminium nitrate. The disclosed Cu (II) -, Al (III) -and Zn (II) -doped TiO 2 materials exhibit enhanced visible-light absorption, improved charge separation, and stable reactive oxygen species (ROS) generation under neutral and broad pH environments. The Cu(II), Zn(II), and Al(III) dopants can promote efficient ROS formation for organic compound decomposition, without the severe electron-proton recombination caused by conventional iron (III) dopants. An installation application for air purification and ventilation is also provided, highlighting the Cu (II) -, Al (III) -and Zn (II) -doped TiO 2 photocatalysts in in a wide range of applications including but not limited to the mitigation of grease trap, sewage, toilet and garbage room odor.

The preparation method comprises the following steps: adding a K source, an N source and aluminum nitrate nonahydrate into water, and uniformly stirring to form a mixed solution; adjusting the pH value of the mixed solution to 8-10, standing, aging, drying and calcining to obtain K-N co-modified aluminum oxide; and grinding the K-N co-modified aluminum oxide and the coal-based solid waste molecular sieve, and calcining and curing to obtain the carbonyl sulfide low-temperature hydrolysis catalyst. A K source, an N source and aluminum nitrate are adopted, the K-N co-doped aluminum-based carbonyl sulfide low-temperature hydrolysis catalyst is synthesized through a one-pot method, synergistic active sites are constructed through K-N co-doping, the limitation that the surface property of an aluminum oxide carrier is regulated and controlled through existing single modification is broken through, the dispersity of performance auxiliaries K and N elements on an aluminum oxide substrate is improved, and the performance of the aluminum oxide carrier is improved. The synergistic effect participating in carbonyl sulfide hydrolysis is enhanced, and efficient hydrolysis of carbonyl sulfide at low temperature is facilitated.

This invention relates to the field of ceramic fiber preparation technology, specifically to a hollow aluminosilicate ceramic fiber and its preparation method. The steps are as follows: Kapok fiber is selected as a template, and ethanol is used as a solvent. The kapok fiber is immersed in a mixed solution composed of aluminum nitrate nonahydrate and tetraethyl orthosilicate. After immersion, the kapok fiber is removed, drained, and vacuum-dried to prevent uneven shrinkage and cracking during sintering. Then, sintering is performed at high temperature. The precursor in the kapok fiber tube wall forms aluminosilicate, while the fiber decomposes and ablates at high temperature, leaving hollow aluminosilicate fibers, thus obtaining stable hollow aluminosilicate ceramic fibers. This invention features a simple and stable process, and the prepared fibers have high hollowness, good thermal shock resistance, and excellent thermal insulation performance, with lower thermal conductivity compared to conventional solid aluminosilicate fibers.

The application discloses a preparation method of a hydrodemetallization catalyst, and comprises the following steps: roasting aluminum nitrate, then impregnating and treating the aluminum nitrate with an impregnation solution containing W and Co, drying and roasting to obtain a modified aluminum oxide compound; (2) sealing and hydrothermally treating the modified aluminum oxide compound in a propylene oxide solution to obtain modified sheet-like pseudo-boehmite HP; (3) mixing the pseudo-boehmite P2 with the HP to obtain a mixture H1, and then rolling the H1 to form a spherical precursor S1; (4) mixing the pseudo-boehmite P2 with the HP to obtain a mixture H2, then mixing the spherical precursor S1 with the H2 and continuing to roll to form a spherical precursor S2; (5) mixing the HP with the S2, rolling, drying, roasting, loading Mo and Ni, and thus obtaining the hydrodemetallization catalyst. The method is particularly suitable for the hydroprocessing of heavy residual oil with high content of impurities such as gum and asphaltene.

This invention belongs to the technical field of resistive electrical components, and specifically relates to a method for preparing a zinc oxide resistor with high gradient and high current flow stability. The zinc oxide resistor comprises: zinc monoxide, bismuth trioxide, antimony trioxide, nickel trioxide, manganese tetroxide, cobalt tetroxide, tin dioxide, boron trioxide, nano-silver powder, aluminum nitrate nonahydrate, barium acetate, binder, dispersant, and deionized water. The zinc oxide resistor designed in this invention has the advantage of good stability under high gradient and high current flow, overcoming the degradation behavior of existing zinc oxide varistors caused by the influence of high current surge impact on the zinc monoxide grain boundary barrier, and is suitable for industrial application.

The invention discloses a preparation method of a formamide-ethylene glycol system Al2O3 film for a semiconductor product, and relates to the technical field of semiconductor film preparation, and the preparation method comprises the following steps: preparing an aluminum salt precursor solution by using aluminum nitrate nonahydrate as an aluminum source, judging a coating state by using a viscosity coating window under a constant temperature condition, and carrying out sealed standing filtration; performing ultraviolet / ozone treatment on the substrate, spin-coating to form a film, and performing segmented pre-drying; the pre-dried film adsorbs water in a controlled humidity atmosphere to induce polycondensation, the humidity is controlled according to dew point or humidity reading, a polycondensation window is judged according to mass increment per unit area, and the dew point or retention time is adjusted back during deviation; performing ultraviolet / ozone treatment on the film and controlling the temperature of the substrate under the condition that a polycondensation window is established, then performing oxygen plasma treatment to form a densified surface layer, and curing in an oxidizing atmosphere to obtain an Al2O3 film; and when the target film thickness is increased, carrying out stack coating. The obtained film comprises a bulk phase layer and a surface densification layer, and can be used as a gate dielectric layer, a passivation layer or a barrier layer.

The invention relates to the technical field of foam extinguishing agents, in particular to a composite flame-retardant fluoride-free foam extinguishing agent and a preparation method thereof. The problems that a fluoride-free foam fire extinguishing agent is insufficient in fire extinguishing efficiency and poor in stability are solved. The preparation method comprises the following steps: treating sodium silicate, aluminum nitrate nonahydrate and zinc borate, and performing spray drying to obtain modified flame-retardant powder; compounding the saponin extract, carboxymethyl chitosan oligosaccharide and alkyl glycoside to obtain a biological surfactant; preparing the cationic sodium alginate, the nanocellulose suspension and the PVP K30 solution to obtain a multi-stage network stabilizer; the fire extinguishing agent is prepared through gradient mixing of the components and silane modified nano silicon dioxide. The fire extinguishing efficiency is improved through a high-temperature synergistic enhancement mechanism of the modified flame-retardant powder and the modified nanoparticles, the stability is enhanced by virtue of the synergistic effect of the multi-stage network stabilizer and the biological surfactant, and the fire extinguishing agent is fluoride-free and environment-friendly, and can effectively extinguish fire and reduce the risk of after-combustion.

The application discloses a kind of nanometer aluminum nitride powder with uniform particle size distribution and a preparation method thereof.The preparation method comprises the following steps: taking each raw material according to molar ratio: aluminum nitrate nonahydrate: aluminum alkoxide: urea=(0.7-0.9):(0.1-0.3):1, dissolving the raw materials in deionized water, stirring at room temperature until completely dissolved to obtain a homogeneous solution; solidifying the homogeneous solution to obtain a solid, vacuum drying under low temperature conditions to obtain a solid precursor; heating the solid precursor to the combustion initiation temperature in a container; at the combustion initiation temperature, the solid precursor is converted into an alumina / carbon composite precursor powder due to the redox reaction; placing the alumina / carbon composite precursor powder in a nitriding furnace, heating to the nitriding temperature under a flowing nitrogen atmosphere and holding, allowing the alumina and carbon to undergo carbothermic reduction nitriding reaction to obtain an intermediate product, and performing decarburization treatment on the intermediate product in an air atmosphere and holding to obtain nanoscale aluminum nitride powder.

The present application relates to the technical field of foam extinguishing agent, in particular to a composite flame-retardant fluorine-free foam extinguishing agent and a preparation method thereof.The present application overcomes the problems of insufficient extinguishing efficiency and poor stability of fluorine-free foam extinguishing agent.By treating sodium silicate, aluminum nitrate nonahydrate and zinc borate, modified flame-retardant powder is obtained by spray drying;by compounding saponin extract, carboxymethyl chitosan and alkyl glycoside, a biological surfactant is obtained;by configuring cationic sodium alginate, nanocellulose suspension and PVP K30 solution, a multi-level network stabilizer is obtained;by gradient mixing the above components and silane-modified nanosilica, the extinguishing agent is prepared;by the high-temperature synergistic strengthening mechanism of the modified flame-retardant powder and the modified nanoparticles, the extinguishing efficiency is improved;by the synergistic effect of the multi-level network stabilizer and the biological surfactant, the stability is enhanced;and the present application is fluorine-free and environmentally friendly, can effectively extinguish fire and reduce the risk of reignition.

The invention discloses a preparation method of a biochar-based catalyst for synchronously removing COS and H2S in blast furnace gas and a desulfurization activated carbon material, and the process method comprises the following steps: (1) modifying a biochar material by using urea, aluminum nitrate and potassium hydroxide by adopting a hydrothermal method, and regulating the surface alkalinity and oxygen vacancy of the biochar material; and (2) carrying out high-temperature calcination on the modified biochar material, improving distribution of Al2O3 and promoting formation of additional reactive oxygen species in the system through the anchoring effect of pyridine N, and cooling to room temperature to obtain the desulfurized active carbon material. The environment-friendly biomass charcoal and cheap chemical raw materials are efficiently converted into the activated carbon material with excellent COS and H2S adsorption performance through the process.

This invention relates to the field of molten salt preparation technology, and in particular to a low-melting-point molten salt, its preparation method, and its applications. It comprises the following raw materials in the indicated mass percentages: sodium nitrate 10-30%, potassium nitrate 5-30%, sodium nitrite 5-50%, aluminum nitrate 1-5%, and calcium carbonate 1-10%. This invention uses five substances—sodium nitrate, potassium nitrate, sodium nitrite, aluminum nitrate, and calcium carbonate—as raw materials to prepare the molten salt. Each component has a low melting point, which lowers the crystallization temperature of the molten salt, resulting in a melting point range of 100-130℃. This helps to broaden the molten salt's heat storage temperature range and reduces the risk of crystallization. Simultaneously, since the presence of sodium nitrite in the molten salt may cause corrosion of metal materials, an appropriate amount of aluminum nitrate is added as a corrosion inhibitor, forming a passivation film to protect the metal surfaces in the system.