35 results about "Aluminium nitrate" patented technology

The invention relates to the chemical field of efficient catalytic conversion of biomass platform compounds into high-added-value chemicals, and particularly provides a preparation method of a flower-shaped nickel aluminum oxide and application of the flower-shaped nickel aluminum oxide in preparation of furfuryl alcohol through catalytic transfer hydrogenation of furfural. The preparation method mainly comprises the following steps: dissolving 0.01 mol of aluminum nitrate, 0.02 mol of nickel nitrate and 0.084 mol of urea in 60 ml of deionized water, stirring at room temperature for 1 h to form a clear solution, transferring the clear solution into a lining of a hydrothermal kettle, aging at 140 DEG C for 7 h, naturally cooling to room temperature, and repeatedly washing with deionized water until the pH value of supernate is 7; and dispersing the separated green muddy precipitate in 200ml of methanol, stirring at room temperature for 2 hours, filtering and washing, and drying at 60 DEG C for 24 hours. And grinding the obtained hydrotalcite precursor into powder, putting the powder into a quartz boat, and carrying out high-temperature calcination for 2 hours in argon flow of 60 ml / min at the temperature of 500 DEG C to finally obtain the grey green solid catalyst. The metal oxide prepared by the invention has the characteristics of uniform components, rich acid-base sites and the like as a catalyst, and has the characteristics of simple preparation method, no need of reduction, environment friendliness and the like when being applied to industrial production. Therefore, when the catalyst is applied to a reaction for preparing furfuryl alcohol through furfural transfer hydrogenation, efficient conversion of furfural can be realized, the conversion rate can reach 100%, and the selectivity is 92.1%.

This case involves a wastewater decolorizer and its preparation method. First, natural attapulgite is pretreated with acid and alkali; then, tetraethyl orthosilicate and aluminum nitrate are added, and silicon dioxide and aluminum oxide are loaded on its surface by hydrolysis and impregnation; silane coupling agent KH570 is added to obtain modified attapulgite; acrylamide is reacted with dicyandiamide and formaldehyde to obtain a dicyandiamide formaldehyde prepolymer containing a carbon-carbon double bond; and the dicyandiamide formaldehyde prepolymer containing a carbon-carbon double bond is polymerized in situ on the surface of the modified attapulgite. The present invention provides a decolorizer for industrial wastewater, which has high stability and can be used in combination with commercially available flocculants to effectively remove COD from water bodies. At the same time, at a relatively low addition amount, it can quickly decolorize industrial wastewater, thereby improving water treatment efficiency and reducing costs.

The invention relates to the technical field of polymer waste treatment, and discloses a composite curing agent for curing chlorine and sulfur in polymer waste microwave thermal conversion and a preparation method and application thereof, and the method comprises the following steps: dissolving calcium nitrate and aluminum nitrate in deionized water to form an active component I solution; dissolving at least one of zinc nitrate, copper nitrate, ferric nitrate, manganese nitrate and cerium nitrate as an active component II in the active component I solution, adding citric acid into the formed mixed solution to form gel, and drying to obtain an active matter; and mixing the active matter, silicon carbide and bentonite, ball-milling, extruding and granulating, and calcining to obtain the composite curing agent. The composite curing agent disclosed by the invention can efficiently recover pyrolytic carbon, pyrolytic oil and pyrolytic gas while effectively and synergistically curing chlorine and sulfur pollution elements in situ; the curing rate of the chlorine / sulfur element can reach 80%, the recovery rate of the composite curing agent can reach 98%, and meanwhile, the raw material cost is low, and the problems of secondary pollution and equipment corrosion are avoided.

The invention discloses a preparation method and application of a hydrotalcite-loaded modified ruthenium-based catalyst, and belongs to the technical field of catalyst preparation, and the preparation method comprises the following steps: preparing a hydrotalcite carrier; adding the hydrotalcite carrier into isobutanol, and uniformly dispersing; mixing anhydrous ruthenium chloride, aluminum nitrate nonahydrate and cerium nitrate hexahydrate, adding the mixture, and uniformly dispersing; heating to 40-100 DEG C, aging for 1-10 hours, and stirring at a constant temperature until the solvent is completely volatilized; grinding to obtain a powdery solid; gradually heating the powdery solid to 200-500 DEG C in a nitrogen atmosphere, roasting for 2-8 hours, introducing hydrogen, adjusting the temperature to 200-600 DEG C, and reducing at constant temperature for 1-6 hours; and after the reduction is finished, cooling to normal temperature in a nitrogen atmosphere to obtain the hydrotalcite-loaded modified ruthenium-based catalyst. The hydrotalcite-loaded modified ruthenium-based catalyst prepared by the preparation method provided by the invention is high in stability, and has the advantages that the active components are not easy to lose, the service life is long, the selectivity is high, the reaction product is easy to separate, and the like.

The invention discloses a nitric acid wastewater treatment system containing aluminum nitrate, including a two-stage column separation system and an aluminum sulfate purification system, wherein the aluminum sulfate purification system includes an aluminum sulfate feed tank, a preheater, a two-effect three-stage falling film evaporator for multiple evaporation and concentration of aluminum sulfate solution, a cooling crystallization tank, a crystallization transfer tank, a filter press, a high-level tank for receiving solids after filter pressing, and a scraper; the aluminum sulfate feed tank is connected to the aluminum sulfate solution tank. The nitric acid wastewater treatment method containing aluminum nitrate based on the wastewater treatment system has a small evaporation amount and a low production risk; the replacement is thorough, and the nitric acid content in the aluminum sulfate solution is obtained to be less, and aluminum sulfate that is better than the national standard can be further produced; the process of the invention is more energy-saving, the obtained aluminum sulfate product is of higher quality, and the overall temperature is not too high, which is conducive to long-term stable operation.

The invention discloses a preparation method of a FeP / Co2P / NF electrocatalytic seawater hydrogen evolution chlorine-resistant electrode plate, relates to a preparation method of an electrode, and aims to solve the technical problems of poor chlorine resistance, few active sites and poor catalytic effect of the conventional TMPs electrode. The method comprises the following steps: after removing oil and an oxide layer from a foamed nickel substrate, putting the foamed nickel substrate into a mixed solution of cobalt salt, ammonium chloride and urea for hydrothermal reaction; then putting into a mixed solution of ferric salt, urea, aluminum nitrate nonahydrate and sodium dodecyl sulfate for hydrothermal reaction; and soaking with an alkaline solution and then carrying out high-temperature phosphorization to obtain the electrode plate. The overpotential of the electrode plate is 30-38 mV when water is electrolyzed for hydrogen production under the current density of 10 mA. Cm <-2 >, the overpotential of the electrode plate is 66-77 mV when seawater is electrolyzed for hydrogen production, the current density is reduced by 15%-20% after the electrode plate works for 100 hours, and the electrode plate has good chlorine resistance and can be used in the field of water electrolysis for hydrogen production.

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 present invention relates to a method and an apparatus for treating wastewater containing aluminum nitrate and nitric acid. The method includes: (1) a neutralization reaction step, including: reacting the wastewater containing aluminum nitrate and nitric acid with a sodium hydroxide solution to obtain a reaction product containing aluminum hydroxide and sodium nitrate; and subjecting the reaction product containing aluminum hydroxide and sodium nitrate to solid-liquid separation to respectively obtain aluminum hydroxide and a solution containing sodium nitrate, (2) an electrochemical membrane reactor treatment step, including subjecting the solution containing sodium nitrate obtained from step (1) to an electrochemical membrane reactor treatment with a potassium salt solution to respectively obtain a potassium nitrate solution and a sodium salt solution, and (3) a bipolar membrane electrodialysis step, including: subjecting the sodium salt solution obtained from step (2) to a bipolar membrane electrodialysis treatment to respectively obtain a sodium hydroxide solution and an acid solution. The apparatus correspondingly includes a neutralization reaction module, an electrochemical membrane reactor module, and a bipolar membrane electrodialysis module.

The invention provides high-purity nanometer aluminum oxide and a preparation method thereof, and belongs to the technical field of aluminum oxide preparation. The method comprises the following steps: reacting aluminum hydroxide with nitric acid to obtain an aluminum nitrate solution, and sequentially carrying out spray drying, nitric acid removal, acidification replacement, flash evaporation and roasting to obtain the high-purity nano aluminum oxide with low impurity content and uniform particle size distribution. The preparation process is simple, the safety coefficient is high, and the quality control of the nano aluminum oxide is well realized.

The invention discloses a composite abrasive particle, a preparation method of the composite abrasive particle and a polishing solution. The preparation method of the composite abrasive particle comprises the following steps that sodium silicate nonahydrate serves as a raw material, and porous SiO2 is prepared through a template method; porous SiO2 and aluminum nitrate nonahydrate are used as raw materials, a chemical precipitation method is utilized, the surface of the porous SiO2 is coated with a layer of fibrous gamma-Al2O3 by regulating and controlling the reaction rate, so that the composite abrasive particles are obtained, the composite abrasive particles are of a core-shell structure, the porous SiO2 is used as an inner core, the fibrous gamma-Al2O3 is used as an outer shell, and the polishing solution contains 3-10 wt% of the composite abrasive particles. The composite abrasive particle has good dispersity, high deformability, a high-hardness shell, a large contact area and good polishing performance, a polishing solution prepared from the composite abrasive particle can be used for chemically and mechanically polishing materials such as titanium, aluminum, tungsten tantalum and quartz, the surface quality is high after polishing, and the material removal rate is high.

The invention belongs to the technical field of resistor electrical elements, and particularly relates to a preparation method of a zinc oxide resistor with high gradient, large through-flow and stable impact. The zinc oxide resistor comprises zinc oxide, bismuth trioxide, antimony trioxide, nickel sesquioxide, manganous-manganic oxide, cobaltosic oxide, tin dioxide, diboron trioxide, nano silver powder, aluminum nitrate nonahydrate, barium acetate, a binder, a dispersing agent and deionized water. The zinc oxide varistor designed by the invention has the advantage of good stability under high gradient and large flux, overcomes the degeneration behavior of the zinc oxide varistor caused by the influence of the existing large-current surge impact on the zinc oxide crystal boundary potential barrier, and is suitable for industrial popularization.

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 invention concerns a process for producing an aluminium formate (ALF) metal-organic framework (MOF) material, comprising providing aluminium diacetate (Al(CH3COO)2(OH)) or any of its hydrates as a starting product, or providing a mixture of starting products comprising aluminium diacetate (Al(CH3COO)2(OH) or any of its hydrates, aluminium nitrate (Al(NO3)3) or any of its hydrates, and aluminium chloride (AlCl3) or its hydrates in a formic acid solution to form a reaction mixture, and aging said reaction mixture for a period of time, causing precipitation of an intermediate product, and retrieving the precipitated intermediate product from the reaction mixture to obtain an aluminium formate metal-organic framework (ALF MOF) material. The invention also concerns an ALF MOF material having a saturated CO2 uptake at 273K and 0.1bar of at least 3 mmol / g, of at least 3.5 mmol / g, of at least 4 mmol / g, or of at least 5 mmol / g CO2.

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.

The invention discloses a sea sand desalination treatment method with low fresh water demand, which comprises the following steps: 1) detecting and determining the content of various ions attached to the surface of sea sand, including Mg < 2 + >, Cl <-> and SO4 < 2->; 2) respectively preparing an aqueous solution of magnesium nitrate hexahydrate and an aqueous solution of aluminum nitrate nonahydrate; 3) adding the magnesium nitrate hexahydrate solution and the aluminum nitrate nonahydrate solution into the sea sand in proportion to form a mixed solution of the sea sand; 4) adding a sodium hydroxide solution into the mixed solution to keep the pH value of the mixed solution in a range of 9.0-11.0, heating, controlling the temperature, stirring, and carrying out an in-situ polymerization reaction; and 5) filtering the completely reacted mixed solution to obtain the sea sand coated with the LDH, and drying the sea sand to obtain the desalted sea sand. The invention solves the problems that the sea sand treatment at the desalination part needs to consume a large amount of fresh water resources and is difficult to implement in areas (such as coastal areas and islands) lacking fresh water resources in the prior art.

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 concerns a process for producing an aluminium formate (ALF) metal-organic framework (MOF) material, comprising providing aluminium diacetate (Al(CH3COO)2(OH)) or any of its hydrates as a starting product, or providing a mixture of starting products comprising aluminium diacetate (Al(CH3COO)2(OH) or any of its hydrates, aluminium nitrate (Al(NO3)3) or any of its hydrates, and aluminium chloride (AlCl3) or its hydrates in a formic acid solution to form a reaction mixture, and aging said reaction mixture for a period of time. The invention also concerns a ALF MOF material with a Brunauer-Emmet-Teller (BET) surface area ranging from 20 m2 / g to 80 m2 / g, and a device using said ALF MOF.

The invention provides a preparation method of aluminum oxide hollow precursor microspheres, and belongs to the field of nano materials. The method comprises the following steps: carrying out hydrolysis reaction on tetraethoxysilane to obtain silicon dioxide microspheres; the preparation method comprises the following steps: carrying out high-pressure homogenization treatment and freeze drying on mixed slurry of silicon dioxide microspheres and polyvinylpyrrolidone to obtain a SiO2-PVP template with a core-shell structure; the preparation method comprises the following steps: dissolving polyacrylic acid in a mixed solution of an aluminum nitrate solution and an aluminum isopropoxide solution to obtain a double-aluminum-source solution; the SiO2-PVP template is dispersed in the double-aluminum-source solution, and a template dispersion liquid is obtained; dropwise adding ammonia water into the template dispersion liquid until the pH value of the template dispersion liquid is 4.2-4.5 to obtain aluminum sol; and carrying out spray drying on the aluminum sol to obtain the aluminum oxide hollow precursor microspheres. By introducing a silicon dioxide-PVP (Polyvinyl Pyrrolidone) composite template, a dynamic pH (Potential of Hydrogen) microfluidic technology and a double-atomization drying process, a novel preparation method of the aluminum oxide hollow precursor microsphere is provided.

The present invention belongs to the technical field of concrete admixtures, and specifically relates to a water reducing agent for concrete and a preparation method thereof. The preparation method comprises the following steps: adding montmorillonite to a stearyl trimethyl ammonium chloride solution, adding zinc chloride, adjusting the pH, stirring the reaction, calcining the obtained product, obtaining pretreated montmorillonite, adding the montmorillonite, aluminum nitrate and magnesium nitrate to water, adding sodium hydroxide and sodium carbonate, stirring the reaction to obtain a first modified montmorillonite, adding the montmorillonite to water and dispersing it uniformly, adding a surfactant, adjusting the pH, stirring the reaction to obtain a second modified montmorillonite, adding the montmorillonite and allyl polyoxyethylene ether to concentrated sulfuric acid, stirring the reaction, adding the product, sodium methacrylic acid, methacrylic acid, and hydroquinone to water to obtain a solution A, taking an initiator and adding it to water to obtain a solution B, respectively dropping the solution A and the solution B into water, and then keeping warm, adjusting the pH, collecting the product, and adding nano-hydroxyapatite to the product to obtain the product.

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.