17 results about "Zirconium hydroxide" patented technology

A method for forming a dehydration catalyst may comprise peptizing a catalyst precursor with an acid, a cellulose ether, or both, thereby forming a catalyst precursor sol, wherein the catalyst precursor comprising a tungstated support of tungsten and at least one of zirconium oxides, zirconium hydroxides, or titanium oxides; subjecting the catalyst precursor sol to kneading and extrusion to form one or more catalyst precursor extrudates; calcining the one or more catalyst precursor extrudates to form a calcined catalyst precursor; and cooling the calcined catalyst precursor to form the dehydration catalyst.

The invention belongs to the technical field of zirconium hydroxide production, and particularly discloses a continuous production process of nano zirconium hydroxide. According to the continuous production process, the zirconium-containing aqueous solution obtained after zirconium and hafnium separation is used as a raw material, and the chlorine salt aqueous solution which is simple in component and low in price is used as an auxiliary material. By limiting the current density and the electrolysis temperature, production is stable and easy to control; the ion diffusion speed of the whole electrolysis system is stable, the electrolysis efficiency is high, and it is guaranteed that the obtained zirconium hydroxide is nano-particles with the narrow particle size range, and the quality is stable; the obtained cathode reaction slurry is high-purity zirconium hydroxide slurry, a corresponding product can be obtained only through solid-liquid separation without drying treatment, and a complex impurity removal post-treatment process is not needed; by controlling electrolysis ending conditions, the product yield is up to 99.5% or above, the content of anion impurities in the product is smaller than 1000 ppm, and particles are fine and uniform and high in quality. The method is simple in process, low in raw material cost, easy in product post-treatment and small in environmental pollution, and is a green synthesis method for synthesizing nano zirconium hydroxide.

A method for forming a dehydration catalyst may comprise peptizing a catalyst precursor with an acid, a cellulose ether, or both, thereby forming a catalyst precursor sol, wherein the catalyst precursor comprising a tungstated support of tungsten and at least one of zirconium oxides, zirconium hydroxides, or titanium oxides; subjecting the catalyst precursor sol to kneading and extrusion to form one or more catalyst precursor extrudates; calcining the one or more catalyst precursor extrudates to form a calcined catalyst precursor; and cooling the calcined catalyst precursor to form the dehydration catalyst. The catalysts of the examples have platinum or palladium impregnated on a tungstated zirconia support.

The present invention discloses a method for preparing and using a heavily coated cobalt oxide. First, spherical cobalt hydroxide particles are synthesized by a co-precipitation method. Then, the spherical cobalt hydroxide particles are dried, dehydrated, and uniformly mixed with zirconium alkyl carboxylate / aluminum alkyl carboxylate and zirconium hydroxide / aluminum hydroxide. The mixture is then heated to react with the cobalt hydroxide on the particle surface, causing it to adhere closely to the surface of the spherical cobalt hydroxide particles. Finally, the particles are calcined to remove organic matter, resulting in spherical cobalt oxide particles with a strong coating on their surface.In the present invention, the coating layer and the base material are connected through chemical bonds, which makes the two adhere to each other more closely, so that the coating layer is not easy to spray off and peel off, greatly extending the service life of the coating layer, and improving the cycle performance of the material.

The utility model discloses a treatment system for nano-zirconia toughened ceramic powder production sewage. The treatment system comprises a first mixing tank for collecting low-alcohol-content wastewater and a second mixing tank for collecting high-alcohol-content wastewater, a vibrating membrane, a vibrating membrane water production tank and a diluted alcohol tower are sequentially arranged in the water outlet direction of the first mixing tank; a concentrated alcohol tower is arranged in the water outlet direction of the second mixing tank; gas phases of the diluted alcohol tower and the concentrated alcohol tower sequentially enter a deamination tower and an ammonia absorption tower, and a liquid phase of the deamination tower sequentially enters a flash tank and a vaporization film; liquid phases of the diluted alcohol tower and the concentrated alcohol tower enter a sewage adjusting tank, a filtering system and a high-pressure reverse osmosis membrane concentration system are sequentially arranged in the water outlet direction of the sewage adjusting tank, high-pressure reverse osmosis membrane produced water enters a low-pressure reverse osmosis membrane concentration system, and low-pressure reverse osmosis produced water is discharged. According to the device disclosed by the utility model, alcohol extraction and deamination, membrane concentration and evaporative crystallization are adopted, and the recovered zirconium hydroxide, ethanol and ammonia water can be directly reused for production, so that the problem of high salinity in sewage is solved, and the water production guarantee rate is improved.

The invention discloses a heat-resistant light wallboard and a preparation method thereof, and relates to the technical field of building wallboards. The hollow microspheres with uniform and stable wall thickness are prepared by copolymerizing supporting macromolecules of polystyrene and zirconium hydroxide, so that the mechanical property and high temperature resistance of the light wallboard are improved, and then the hollow microspheres are blended with nano boron carbide, calcium magnesium aluminate cement and phosphate cement to form a system with a complete structure, so that the mechanical property of the wallboard is further improved, and the light wallboard has a good application prospect. Then, low-porosity foam is prepared by adopting a carbon dioxide foaming process, calcium ions and magnesium ions in the cement are subjected to mineralization reaction with carbon dioxide to form calcite, so that the curing effect is achieved, the strength and the high-temperature-resistant effect of the wallboard are improved, then, hollow microspheres are calcined and hardened, phosphate can be used as a high-temperature adhesive, and the wallboard can be well cured. Pores in a matrix are filled with the boron carbide, so that the mechanical property and the high-temperature-resistant effect of the wallboard are improved.

This invention discloses a method for crystallizing sodium nitrate in the field of inorganic salt crystallization technology. The method involves dissolving sodium nitrate raw material in deionized water and filtering. Magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets anchored with fluorine-containing cerium-zirconium hydroxide-hydrated oxides are added to the filtrate. The mixture is then dispersed under heat, cooled in stages, seeded with sodium nitrate under reduced pressure, evaporated under reduced pressure, crystallized under heat, centrifuged, washed with a saturated sodium nitrate solution, and dried to obtain sodium nitrate crystals. The fluorine-containing cerium-zirconium hydroxide-hydrated oxide-anchored magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets are obtained through co-precipitation of magnesium, aluminum, cerium, and zirconium nitrates, heat treatment with fluorine-containing water, silicon-boron composite modification, and heat-treated grinding and spray drying. This invention can regulate the nucleation and growth of sodium nitrate crystals, improve crystal particle size uniformity, reduce mother liquor entrainment, and improve crystal separation and drying effects.

The application discloses a polyamide composition and a preparation method and application thereof, and belongs to the field of high polymer materials. The polyamide composition utilizes an organic phosphine flame retardant and a flame retardant synergist to form a flame retardant system, and introduces aromatic polyamide and zirconium hydroxide to improve electrochemical corrosion resistance. Under the synergistic effect of the components, the composition has excellent mechanical properties, flame retardant properties and electrochemical corrosion resistance, especially high-temperature and high-humidity (such as 85 DEG C in temperature and 85% RH in humidity) electrochemical corrosion resistance, and has a very good application prospect in the fields of new energy high-voltage connectors, energy storage connectors and the like.

Method for manufacturing elements for electrical working machines, which are formed with superimposed layers (1) of iron or an iron alloy with soft magnetic properties and in which an electrically insulating layer (2) is arranged between each of the layers (2) formed with iron or with the iron alloy, wherein the layers (1) of iron or the iron alloy each with a suspension formed with iron or with a powder of the iron alloy and an organic binder are formed by screen printing in a predetermined geometry with a predetermined first layer thickness and the electrically insulating layers (2) formed between the layers (1) of iron or the iron alloy formed by screen printing, which are formed with a powder and an organic binder, are formed by screen printing in the specified geometry with a specified second layer thickness, wherein the powder is a hydroxide or acetate selected from magnesium hydroxide, aluminum hydroxide, zirconium hydroxide, magnesium acetate, aluminum acetate and zirconium acetate or a carbonate selected from magnesium carbonate and zirconium carbonate and Following screen printing, the resulting layer stack undergoes a thermal treatment, during which In a first stage, debinding takes place in the temperature range between 100 °C and 800 °C, whereby the respective hydroxide, acetate and / or carbonate is decomposed in the temperature range between 100 °C and 300 °C, and a chemical reaction is carried out in which the respective hydroxide, acetate and / or carbonate is formed into the respective metal oxide with a fine particle size distribution of < 1 µm, and following the first stage, a second stage of thermal treatment is carried out, in which in a reducing atmosphere at a temperature in the range of 1200°C to 1350°C, sintering of the iron or the respective iron alloy is carried out to form layers (1) with corresponding soft magnetic properties and porous electrically insulating layers (2) are obtained.

The invention discloses a zirconium oxide powder production system, which realizes automatic production of generating zirconium oxide powder from wet material zirconium hydroxide, and adopts the technical scheme that the zirconium oxide powder production system comprises a dryer, a crusher, a calcining furnace, a cooling unit, a crusher and a packaging unit which are sequentially butted; the dryer is used for drying wet material zirconium hydroxide; the crusher is used for crushing and drying zirconium hydroxide; the calcining furnace is used for calcining zirconium hydroxide to generate zirconium oxide; the cooling unit is used for cooling zirconium oxide to a preset temperature; the crusher is used for crushing zirconium oxide to form zirconium oxide powder; and the packaging unit is used for quantitatively packaging zirconium oxide powder, and belongs to the technical field of inorganic compound production.

The present specification describes a zirconia support comprising > = 95 wt% ZrO2 wherein: the support has a crushing strength of 20 N to 140 N; the support has a total pore volume of from 0.10 mL / g to 0.40 mL / g when measured by N2 physical adsorption; the carrier has an acidic site density of 15 LNH3 / m < 2 > to 30 LNH3 / m < 2 >; and the carrier has an alkaline site density of from 0.006 wt% / m2 to 0.015 wt% / m2 as measured by the MBOH test. Also described is a method for producing a zirconia support starting from zirconia or zirconia hydroxide as a starting material.

This invention discloses a light-emitting diode (LED) packaging material and its preparation method, relating to the field of LED technology. The method includes the following steps: 4,4'-diaminodiphenyl ether is added to pyromellitic dianhydride for a condensation reaction to obtain a polyamic acid solution; zinc borate nanowires and aluminum nitride powder are added to obtain an inorganic framework-reinforced polyamic acid suspension; zirconium hydroxide sol is reacted with aluminum sec-butoxide solution, followed by hydrothermal reaction and high-temperature calcination to obtain ZrO2@α-Al2O3 core-shell particles; 4,4'-diphenylmethane bismaleimide and bisphenol A cyanate are prepolymerized to obtain a prepolymer; bisphenol A epoxy resin, the inorganic framework-reinforced polyamic acid suspension, ZrO2@α-Al2O3 core-shell particles, and the prepolymer are mixed and degassed under vacuum, injected into a mold, cured by heating, and then demolded to obtain the product. This invention, through a triple modification synergistic effect, improves the high-temperature resistance and long-term thermal stability of the packaging material, making it suitable for LED packaging applications with high temperature resistance requirements.

The present disclosure relates to a method for preparing an electrolytic hydrogen production diaphragm, wherein the method comprises: mixing inorganic oxidized particles, metal hydroxide, binder and pore-forming agent to obtain a mixed slurry; coating the mixed slurry on one side or both sides of a porous base film to obtain a nascent film; soaking the nascent film in an extraction liquid and then performing a drying treatment; wherein the porous base film comprises a metal mesh; the metal hydroxide comprises one or more of nickel hydroxide, nickel oxyhydroxide, zirconium hydroxide, cerium hydroxide and yttrium hydroxide. The method provided by the present disclosure effectively improves the temperature resistance and high-temperature dimensional stability of the electrolytic hydrogen production diaphragm prepared by the method, while effectively improving the affinity of the diaphragm to the electrolyte, reducing the diaphragm resistance. Using the electrolytic hydrogen production diaphragm provided by the present disclosure in an alkaline electrolytic hydrogen production device can realize the operation of the electrolytic hydrogen production device at a temperature above 110 DEG C, and effectively improve the electrolysis efficiency.

The application discloses a positive and negative electrode powder separation method, which comprises the following steps: S1, crushing, drying and air selecting a waste ternary lithium battery to remove the shell and diaphragm to obtain a mixture; S2, calcining the mixture in an inert gas atmosphere, and then magnetically selecting the magnetic substance and the non-magnetic substance; S3, separating the magnetic substance by wet stripping to separate the positive electrode foil and the positive electrode powder, and separating the non-magnetic substance by wet stripping to separate the negative electrode foil and the negative electrode powder; S4, dissolving the positive electrode powder in solution A, adding nickel sulfate, cobalt sulfate and manganese sulfate to uniformly mix to obtain solution B, then uniformly mixing solution B with a sodium carbonate aqueous solution, adjusting the pH to 8-8.5 by using ammonia water, carrying out a hydrothermal reaction, and collecting the precipitate; uniformly mixing the precipitate with lithium carbonate and zirconium hydroxide, primary sintering, and obtaining intermediate materials; then uniformly mixing the intermediate materials with ammonium molybdate tetrahydrate, secondary sintering, and obtaining a modified positive electrode material.

This method for producing a positive electrode active material for secondary batteries is characterized by including: an oxidation step of adding at least one hydroxide selected from the group consisting of aluminum hydroxide, strontium hydroxide, titanium hydroxide, bismuth hydroxide, zirconium hydroxide, and barium hydroxide to an Ni-containing compound, and performing oxidation treatment by heating the mixture; a firing step of mixing an oxide obtained in the oxidation step with an Li-containing compound, and firing the mixture; a water-washing step of mixing a fired product obtained in the firing step with water or an aqueous solution, and washing the mixture with water; and a drying step of drying the wet powder obtained in the water-washing step to obtain a lithium transition metal composite oxide, wherein the heating temperature in the oxidation step is 250°C-650°C inclusive.

The application provides a method for preparing high-dispersion zirconium dioxide, comprising the following steps: dissolving a zirconium salt in water, adding a composite directing agent, and mixing to obtain a precursor solution; the composite directing agent comprises an imidazole ionic liquid and a non-ionic surfactant; dropwise adding the precursor solution into a mixed bottom solution containing an alkaline precipitator and a cationic surfactant, maintaining the pH of the reaction system at 10.5-11.5 to form a zirconium hydroxide precipitate, and obtaining a zirconium hydroxide slurry; filtering and washing the zirconium hydroxide slurry to remove impurity ions, and then replacing and dispersing with a low-carbon alcohol to obtain an alcohol gel precursor; dispersing the alcohol gel precursor in an azeotrope agent to perform azeotrope rectification, removing the azeotrope agent and the solvent, and obtaining a dry powder; and mixing the dry powder with an inorganic salt, and then performing a step-by-step controlled calcination treatment to obtain high-dispersion zirconium dioxide.

The invention discloses a method for preparing tetragonal phase zirconium dioxide stable at room temperature by an ammonium chloride reduction strategy. The method comprises the following steps: preparing a zirconium hydroxide precursor through inorganic zirconium salt and ammonia water precipitation, carrying out solid-phase mixing on the zirconium hydroxide precursor and ammonium chloride according to a certain ratio through a ball milling method, and carrying out high-temperature annealing to construct the tetragonal phase zirconium dioxide stable at room temperature. The method is simple and efficient, and the synthesized t-ZrO2 is high in purity, relatively stable at normal temperature, not prone to phase change or structure change, good in thermal stability and chemical stability and beneficial to long-time storage.