67 results about "Zirconium hydroxide" patented technology

The preparation process comprises the following steps: dissolving ammonium dimolybdate, ammonium rhenate and water at a high temperature, then adding zirconium hydroxide, uniformly mixing, carrying out vacuum drying, carrying out two-stage hydrogen reduction on the obtained precursor composite powder, and carrying out vacuum drying to obtain the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains, thereby obtaining the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains. Zirconium oxide reinforced molybdenum-rhenium composite powder obtained after reduction is subjected to cold isostatic pressing, pressureless sintering and hot isostatic pressing to obtain zirconium oxide reinforced molybdenum-rhenium alloy, and then the zirconium oxide reinforced molybdenum-rhenium alloy is obtained through high-temperature rolling and recrystallization annealing treatment. According to the method, atomic-level mixing of molybdenum and rhenium is achieved through liquid-phase doping, the microstructure of the molybdenum-rhenium alloy is more uniform and fine due to addition of ZrO2, the recrystallization temperature is increased, and the phenomenon that sintered grains of the molybdenum-rhenium alloy grow abnormally is relieved. And by optimizing the annealing process and regulating and controlling the annealing mode, grains are rearranged to form a more uniform microstructure, abnormal growth of the grains is further inhibited, and the high-temperature tensile strength and the ductility of the molybdenum-rhenium alloy are improved.

The present invention discloses a bromine-based flame-retardant reinforced nylon material and a preparation method thereof, and belongs to the technical field of engineering plastics. The bromine-based flame-retardant reinforced nylon material of the present invention is compounded with specific zirconium hydroxide and hydrotalcite to solve the problem of acidic corrosive gas from both physical and chemical aspects, improve the stability of the bromine-based flame-retardant nylon resin system, and enable the product to have good high temperature aging resistance. The present invention also discloses a preparation method of the product and its application in the preparation of electronic and electrical products.

The invention belongs to the technical field of superfine powder preparation and lithium battery materials, and particularly relates to monoclinic-phase zirconium oxide nano powder as well as a preparation method and application thereof. The preparation method comprises the following steps: adding zirconium oxychloride octahydrate into water for dissolving to obtain a zirconium oxychloride aqueous solution, then putting the zirconium oxychloride aqueous solution into a hydrothermal reaction kettle, heating to 140-160 DEG C for hydrothermal reaction, cooling to room temperature after the reaction is completed, and standing for precipitation; then adding ammonia water to carry out ammonolysis reaction, standing and aging, completely precipitating residual zirconium ions, separating the precipitate, washing and drying to obtain a zirconium hydroxide precursor; and finally, carrying out heat preservation calcination treatment at 850-950 DEG C in an air environment to obtain the monoclinic phase zirconium oxide nano powder. The preparation method is simple in preparation process, and toxic and harmful substances are not introduced. The obtained nano ZrO2 powder has the advantages of accurate chemical composition, small powder particle size and low Cl <-> content, and meets the specification requirements of lithium battery positive electrode material additives.

The invention discloses a polyamide composition as well as a preparation method and application thereof, and belongs to the field of high polymer materials. According to the polyamide composition, the organic phosphine flame retardant and the flame-retardant synergist are utilized to form a flame-retardant system, the aromatic polyamide and the zirconium hydroxide are introduced to improve the electrochemical corrosion resistance, and under the synergistic effect of all the components, the composition has excellent mechanical performance, flame retardance and electrochemical corrosion resistance, and the flame-retardant polyamide composition is suitable for being applied to the field of flame retardants. Particularly, the composite material has the electrochemical corrosion resistance under the conditions of high temperature and high humidity (such as the temperature of 85 DEG C and the humidity of 85% RH), and has a very good application prospect in the fields of new energy high-voltage connectors, energy storage connectors and the like.

The invention discloses a light-emitting diode packaging material and a preparation method thereof, and relates to the technical field of light-emitting diodes. The method comprises the following steps: adding 4, 4 '-diaminodiphenyl ether into pyromellitic dianhydride for condensation polymerization to obtain a polyamic acid solution, and adding zinc borate nanowires and aluminum nitride powder to prepare an inorganic skeleton enhanced polyamic acid suspension; the preparation method comprises the following steps: reacting zirconium hydroxide sol with an aluminum sec-butoxide solution, and carrying out hydrothermal reaction and high-temperature calcination to obtain ZrO2at-alpha-Al2O3 core-shell particles; the preparation method comprises the following steps: pre-polymerizing 4, 4 '-diphenylmethane bismaleimide and bisphenol A cyanate ester to obtain a prepolymer; the preparation method comprises the following steps: mixing bisphenol A type epoxy resin, inorganic skeleton reinforced polyamide acid suspension, ZrO2at-alpha-Al2O3 core-shell particles and a prepolymer under vacuum, defoaming, injecting into a mold, heating, curing, cooling and demolding to obtain the product. Through the synergistic effect of triple modification, the high temperature resistance and lasting thermal stability of the packaging material are improved, and the packaging material is suitable for the field of light emitting diode packaging with high temperature resistance requirements.

The invention discloses a polyamide composite material as well as a preparation method and application thereof, and belongs to the field of high polymer materials. According to the polyamide composite material disclosed by the invention, aluminum diethylphosphinate and the synergistic flame retardant are added to form a flame-retardant system; the ceramic forming agent and the zirconium hydroxide are added, so that the tracking resistance of the material is improved by utilizing the synergistic effect of the ceramic forming agent and the zirconium hydroxide. The polyamide composite material has good tracking resistance and flame retardance, and is suitable for preparing electronic and electrical products, new energy products and the like.

The invention relates to a preparation method of a double-layer high-temperature adhesive for connecting brass and aluminum oxide, which comprises the following steps: reacting aluminum hydroxide, zirconium hydroxide and dilute phosphoric acid to prepare an aluminum zirconium phosphate adhesive base solution, and compounding silicon powder, boron carbide, titanium powder, nickel powder and the adhesive base solution to prepare a special adhesive for coating a brass surface. And compounding silicon powder, boron carbide, titanium powder, nickel powder, aluminum oxide and the gum base solution to prepare the special adhesive for aluminum oxide surface coating. The brass surface coating special glue is brushed on the brass surface and cured, then the aluminum oxide surface coating special glue is brushed on the aluminum oxide surface, the brass coated with the adhesive and the aluminum oxide coated with the adhesive are attached together in the mode that the bonding surfaces are opposite, and the brass / aluminum oxide double-layer bonding piece is obtained after pressing and curing and can serve in the high-temperature environment. The method has the advantages that the special glue for brass surface coating and the special glue for aluminum oxide surface coating have high thermal expansion coefficient matching with brass and aluminum oxide, and thermal stress can be relieved; the double-layer adhesive can provide the bonding strength which can reach 1.3 MPa at the temperature of 500 DEG C.

The invention relates to the technical field of metal composite materials, and discloses a modified graphene reinforced aluminum alloy composite material and a preparation method thereof.The preparation method comprises the steps that zirconium hydroxide is loaded on graphene oxide through a hydrothermal reaction, then zirconium oxide modified graphene oxide is obtained through high-temperature sintering treatment, then reduction treatment is conducted in the hydrogen atmosphere, and the modified graphene reinforced aluminum alloy composite material is obtained. The preparation method comprises the following steps: preparing zirconium-modified graphene, then doping a boron element by adopting an ion implantation process to obtain composite modified graphene, doping zirconium, zirconium (Zr) and aluminum to form an Al3Zr compound, so that the recrystallization process can be hindered, recrystallized grains can be refined, and the generation of an aluminum carbide phase can be inhibited; by doping the boron element, the wettability between graphene and an aluminum alloy melt is improved, the uniform dispersity of graphene in an aluminum alloy matrix can be effectively improved, meanwhile, boron serves as a grain refiner and acts together with zirconium, the grain refinement effect can be further enhanced, and therefore the strength and plasticity of the aluminum alloy are improved.

The application relates to the technical field of textiles, and particularly discloses a plastic fiber deodorizing master batch and a preparation method thereof.A plastic fiber deodorizing master batch, according to mass percentage, raw materials include 50-87% plastic chips, 5-20% zinc oxide, 5-20% zirconium compound composite powder and 3-10% composite dispersant, the zirconium compound composite powder includes zirconium hydroxide and layered zirconium phosphate.The plastic fiber deodorizing master batch can efficiently adsorb and decompose various odors such as ammonia, acetic acid, isoamyl acid and nonenal, has a wider deodorization spectrum, a higher elimination rate and stronger deodorization durability.

The invention discloses a method for separating positive and negative electrode powder. The method comprises the following steps: S1, crushing and drying a waste ternary lithium battery, and winnowing to remove a shell and a diaphragm to obtain a mixture; s2, calcining the mixture in an inert gas atmosphere, and then performing magnetic separation to separate magnetic substances from non-magnetic substances; s3, separating a magnetic substance by wet stripping to separate the positive electrode foil from the positive electrode powder; separating non-magnetic substances by wet stripping, so that the negative electrode foil is separated from the negative electrode powder; s4, dissolving the positive electrode powder in the solution A, adding nickel sulfate, cobalt sulfate and manganese sulfate, uniformly mixing to obtain a solution B, then uniformly mixing the solution B with a sodium carbonate aqueous solution, adjusting the pH value to 8-8.5 by using ammonia water, carrying out a hydrothermal reaction, and collecting a precipitate; uniformly mixing the precipitate with lithium carbonate and zirconium hydroxide, and performing primary sintering to obtain an intermediate material; and uniformly mixing the intermediate material with ammonium molybdate tetrahydrate, and carrying out secondary sintering to obtain the modified positive electrode material.

The invention relates to nano zirconium hydroxide, a preparation method thereof and an n-butane skeletal isomerization catalysis method using the nano zirconium hydroxide. The nano zirconium hydroxide has a spherical and / or sphere-like morphology, and the particle size distribution is 10-30nm. The nano zirconium hydroxide is especially suitable for being used as a catalyst carrier, is especially suitable for being used as a carrier of an n-butane isomerization catalyst, and can improve the conversion per pass of n-butane and the selectivity of isobutane.

The present invention provides a method for increasing the surface adhesion of molecular sieve particles, and an oxide layer and / or a hydroxide layer are coated on the outer surface of a Cu-SSZ-13 molecular sieve by an atomic layer deposition method; the oxide layer includes one or more of silicon oxide, aluminum oxide, titanium oxide, zirconium oxide and rare earth oxide; the hydroxide layer includes one or more of silicon hydroxide, aluminum hydroxide, titanium hydroxide, zirconium hydroxide and rare earth hydroxide. The present invention is aimed at the disadvantages that the molecular sieve catalyst has low surface adhesion and is easy to fall off after coating, and the molecular sieve is coated with an oxide layer and / or a hydroxide layer to improve the surface adhesion of the molecular sieve. It does not affect the high activity temperature window of the molecular sieve catalyst, reduces the risk of falling of the molecular sieve catalyst, and improves the service life of the catalyst, which has good application value.

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 discloses an aluminum alloy anti-glare panel material and a preparation method thereof, and belongs to the field of non-ferrous metal materials. The preparation method comprises the following steps: preparing a zirconium oxide precursor aqueous solution from zirconium hydroxide, magnesium nitrate hexahydrate, yttrium nitrate hexahydrate and other raw materials, performing liquid-solid mixing on the zirconium oxide precursor aqueous solution and aluminum alloy powder, filling an anti-glare panel mold with zirconium oxide and aluminum alloy mixed powder obtained after vacuum calcination, and pressing and sintering to obtain the aluminum alloy anti-glare panel. Zirconium oxide particles are fine and evenly distributed at the grain boundary of an aluminum matrix, the grain boundary is strengthened, the tendency of alloy intergranular corrosion is reduced, and the service life of the highway anti-glare panel under the long-term sun-exposure and rain-drenching condition is remarkably prolonged.

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 utility model relates to a rotary kiln for preparing zirconium oxide, and relates to the technical field of zirconium oxide preparation equipment, the rotary kiln is sequentially and rotatably provided with a metal kiln cylinder, a ceramic kiln cylinder and a cooling kiln cylinder, zirconium hydroxide and zirconium oxide materials are firstly heated in the metal kiln cylinder so as to dehumidify and remove impurities; then, sintering is carried out in a ceramic kiln cylinder, and zirconium hydroxide is converted into zirconium oxide; and finally, cooling in the cooling kiln cylinder. The process can realize automatic, continuous and uninterrupted production, so that the stability and continuity of zirconium oxide are ensured, and the industrial production requirements are met. Meanwhile, the metal kiln barrel is made of 310S stainless steel materials, the ceramic kiln barrel inner container is made of high-purity zirconia ceramic, the purity of products is guaranteed, and therefore high-purity zirconia powder can be prepared. In addition, the cooling kiln barrel is made of metal materials, the cooling speed is effectively increased, the production cycle is greatly shortened, and the production efficiency is improved.

The present invention provides a polymer gel channeling sealant for heavy oil steam stimulation. The polymer gel channeling sealant system employs nano-zirconium hydroxide particles as a strengthening agent, a phenolic crosslinker or a urotropine / hydroquinone mixed crosslinker as a crosslinker, and a nonionic polyacrylamide as a gelling agent. The polymer gel channeling sealant is stable for over 180 days at a high temperature of 170°C, achieving high sealing strength and a sealing rate exceeding 85%.

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 adhesive film for circuit connection contains conductive particles and includes a region A containing a cationic polymerizable compound, a thermal cationic polymerization initiator, and an ion scavenger in the thickness direction of the film. The cationic polymerizable compound contains an epoxy compound, the thermal cationic polymerization initiator contains an anilinium salt, and the ion scavenger contains at least one metal compound selected from the group consisting of aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zirconium hydroxide, zirconium oxide, bismuth hydroxide, bismuth oxide, calcium hydroxide, calcium oxide, tin hydroxide, tin oxide, manganese hydroxide, manganese oxide, antimony hydroxide, antimony oxide, silicon hydroxide, silicon oxide, titanium hydroxide, and titanium oxide.

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.

A preparation method of a ceramic material for a lithium battery diaphragm sequentially comprises the following steps: (1) preparing a zirconium oxychloride solution, carrying out a neutralization precipitation reaction with ammonia water, and controlling the pH value of a reaction system to be 8.6-9.0 to generate a zirconium hydroxide precursor; (2) carrying out filter pressing and washing on the zirconium hydroxide precursor to prepare a zirconium hydroxide filter cake; (3) calcining the zirconium hydroxide filter cake at the temperature of 740-750 DEG C to generate zirconium dioxide granules; (4) adding water into the zirconium dioxide granules to prepare slurry, adding a water-soluble anionic polymer, grinding and removing magnetic inclusions until the particle size reaches 0.4-0.6 mu m; (5) spray granulation; (6) secondary removal of magnetic impurities; and (7) jet milling. According to the method, the ceramic powder with excellent dispersity, uniform granularity and low magnetic inclusion can be prepared, so that when the ceramic powder is used as a lithium battery diaphragm coating material, the thermal stability of a battery can be remarkably improved, and the wettability and the electrolyte retention capability of an electrolyte can be improved.

The application belongs to the technical field of gas adsorbents, and particularly relates to a sulfur dioxide low-temperature adsorbent, a preparation method and application thereof. The sulfur dioxide low-temperature adsorbent comprises a carrier and an active component loaded on the carrier; the carrier is a mixture of aluminum hydroxide and zirconium hydroxide, the mass ratio of the aluminum hydroxide to the zirconium hydroxide is 4:1-4; the active component is metal copper and / or metal potassium; and the mass ratio of the carrier to the active component is 100:4-15. The sulfur dioxide low-temperature adsorbent provided by the application can effectively adsorb sulfur dioxide in flue gas at a working temperature of 280 DEG C, and the sulfur capacity is more than 95 mg / g, so that the advantages of low working temperature, low energy consumption and high sulfur dioxide adsorption efficiency are combined. Moreover, the preparation process is simple and easy to operate, the production process is short, and the production cost is low.

The invention relates to the technical field of cement, and particularly discloses high-performance cement with cooperation of a vertical mill and ball milling and a preparation method of the high-performance cement. The high-performance cement comprises the following raw materials: Portland cement clinker, dihydrate gypsum, a polycarboxylate superplasticizer, fly ash, granulated blast furnace slag, silica fume and modified graphene oxide, the modified graphene oxide is prepared by the following operation steps: preparing a graphene oxide aqueous solution, adding ascorbic acid, adding indium hydroxide and zirconium hydroxide, adjusting pH for reaction, filtering and drying to obtain the modified graphene oxide. When the cement is prepared, the vertical mill is in butt joint with the ball mill, mixed cement raw materials are added into the vertical mill, and then ball milling is carried out. The 3d / 28d compressive strength and the 3d / 28d breaking strength of the cement obtained in the invention are respectively 29.3 MPa, 52.0 MPa, 6.5 MPa and 9.7 MPa at most, are qualified through stability detection, are high in crack resistance and have relatively high comprehensive performance.

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 invention discloses a preparation method of a high-rate low-temperature-resistant lithium ion battery negative electrode material, which comprises the following steps: uniformly stirring artificial graphite, niobium oxychloride and zirconium oxychloride to obtain a mixture A; adding deionized water into the mixture A to obtain a solid-liquid coexisting mixture B; adding a precipitator into the mixture B to obtain a reaction product; filtering, washing and drying the reaction product to obtain a solid mixture C of artificial graphite-niobium hydroxide-zirconium hydroxide; and heating the solid mixture C in an oxidizing atmosphere, and carrying out ball milling to obtain the high-rate and low-temperature-resistant lithium ion battery negative electrode material. The preparation method has the advantages that the artificial graphite is compounded with the niobium oxide and the zirconium oxide, and the lithium ion transmission rate and the electron movement rate of the artificial graphite in the charge-discharge working process when the artificial graphite is used as the negative electrode of the lithium ion battery are accelerated by utilizing the high electron conductivity characteristic of the niobium oxide and the high ion conductivity characteristic of the zirconium oxide; the charge-discharge rate performance is improved, so that the low-temperature resistance is improved.

A method for washing chloride ions from a zirconium hydroxide filter cake comprises the following steps: (1) adding the zirconium hydroxide slurry after neutralization and precipitation reaction to a vacuum filter, starting suction filtration, and removing mother liquor until the height difference between the mother liquor level and the filter cake surface is 10-20% of the filter cake thickness; (2) adding a washing liquid to the filter cake in the vacuum filter, wherein the washing liquid is ammonia water with a pH value of 9.5-10.5; removing the filtrate that has been exchanged with the filter cake by suction filtration until the height difference between the washing liquid level and the filter cake surface is 10-20% of the filter cake thickness; (3) sampling and detecting the chloride ion concentration of the filter cake after treatment in step (2); if the chloride ion concentration is equal to or lower than the control requirement value, proceeding to step (4); if the chloride ion concentration is higher than the control requirement value, returning to step (2); (4) continuing suction filtration to remove excess water in the filter cake until the filter cake meets the solid content control requirement. The present invention can quickly and effectively remove chloride ions from the zirconium hydroxide filter cake, is simple to operate, and helps reduce production costs.

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.