307 results about "Zirconium hydroxide" patented technology

The invention relates to a method for recovering zirconia and yttria from the yttria-stabilized zirconia solid solution waste, which comprises the following steps: mixing the solid solution waste powder, sulfate and salt; acidizing and calcining at 200 to 320 DEG C; leaching the acidizing water and/or mother liquor under self-heating conditions; concentrating the leaching solution to leach zirconium sulfate; dissolving the zirconium sulfate in the water and purifying; neutralizing the zirconium hydroxide with alkali and precipitating; calcining the zirconium hydroxide to obtain zirconia; precipitating zirconium mother liquor to produce by-product of ammonium sulfate; neutralizing yttrium rich mother liquor and precipitating to obtain yttrium; dissolving yttrium rich residue with acid and purifying; precipitating oxalate to obtain yttrium oxalate; calcining to obtain the yttria. The method has the advantages of effectively separating the yttria from the zirconia in stable zirconia solid solution waste with optional yttrium ion under low temperature condition, changing the zirconia solid solution waste into valuables and utilizing the resources.

A filtration device including a fluid-impermeable housing having a gas inlet and outlet, and containing within the housing first filter media particles of an extended surface area substrate and containing at least one metal impregnant, and second filter media particles of an extended surface area zirconium hydroxide substrate and zinc (hydr)oxide. The device may be used in atmospheres containing various harmful gases, and may provide particularly useful improvements in NO_x breakthrough times compared to a device containing only the first filter media particles or only the second filter media particles.

The invention discloses a zirconia-alumina composite oxide carrier and a method for preparing the same. The carrier is prepared from a zirconium hydroxide-aluminum hydroxide gel serving as a raw material by using a super-solubility micelle method. Because the gel contains a surfactant and hydrocarbon components, zirconia nanoparticles and alumina nanoparticles formed after dehydration of polymerized zirconium hydroxide and aluminum hydroxide still have rod-like basic structures after shaping and roasting, and the nanoparticles are disorderly stacked into a frame structure. The carrier has large pore volume, large aperture, high porosity, large orifices on outer surface and high pore penetrability, and particularly for high molecules, the carrier can prevent a catalyst from becoming inactivated due to blockage of the orifices, contribute to increasing the deposition of impurities and prolong the operating period of the catalyst because the carrier does not have orifices similar to ink bottle-shaped orifices. The carrier can be used in catalytic reactions comprising high molecular reactants or products.

The invention provides a carbon nano tube / nano zirconium oxide composite toughening material and its preparing process, wherein the material is CNTs with nano zirconium oxide particles adhered on the surface, and the preparing process comprises, preparing CNTs suspending liquid, charging zirconium source and strong base to form CNTs / zirconium hydroxide colloid, heating the CNTs / zirconium hydroxide colloid to dehydrate the colloid, then transforming zirconium hydroxide into zirconium oxide under high temperature protection state, finally obtaining the carbon nano tube / nano zirconium oxide composite toughening material with controllable nano grade grain diameter, when used for alumina ceramics, the fracture toughness property can be improved appreciably.

The invention discloses a method for preparing a cerium oxide-zirconium oxide based composite rare-earth oxide. The method comprises the following steps of: (1) heating a zirconium salt solution at room temperature, slowly adding sulfate ions, controlling the temperature rise rate so that the temperature is increased in the range of 90-95 DEG C when the sulfate ions are added completely, and then preserving heat for 20-100 minutes, thereby forming a zirconium basic sulfate composite salt precursor; (2) adding a cerium salt and a rare-earth metal salt to the precursor solution and stirring evenly, thereby obtaining a slurry; (3) settling the slurry by using basic carbonate and/or a basic oxalate solution, thereby obtaining a precipitate; and (4) filtering and washing the precipitate obtained in the step (3), removing purities, and calcining the washed precipitate. The cerium oxide-zirconium oxide based composite rare-earth oxide prepared by the method by controlling raw materials and process conditions has the characteristics of being high in total fine pore volume, high in fresh specific surface area, high in oxygen storage capacity and the like.

The present invention relates to a process for decontaminating surfaces contaminated with toxic agents. The process comprises contacting a contaminated surface with a sorbent comprised of zirconium hydroxide onto which at least one reactive moiety is optionally impregnated.

The invention discloses coarse-grained sphere-like zirconium hydroxide with large specific surface area. Zirconium hydroxide adopts a sphere-like structure in shape, the grain size D10 is larger than or equal to 8 mu m, the diameter D50 is larger than or equal to 30 mu m and smaller than or equal to 40 mu m, the diameter D90 is smaller than or equal to 80 mu m, the specific surface area is larger than or equal to 550 m<2>/g, the pore volume is 0.20-0.25 cm<3>, the pore diameter is 2.0-2.4 nm, and the phosphorus/sulfur dynamic adsorption capacity of zirconium hydroxide is larger than 1 mmol/g. The invention further provides a preparation method of coarse-grained sphere-like zirconium hydroxide with the large specific surface area. According to the method, zirconium oxychloride reacts with SO4<2->, a product reacts with potassium hydroxide or sodium hydroxide, and zirconium hydroxide is directly prepared; ammonium ions are avoided effectively, and the prepared product contains few impurities and is uniform in grain size, large in specific surface area and high in activity. With adoption of the coarse-grained sphere-like structure, the product can be applied to phosphorous removal through dynamic adsorption for hemodialysis and can effectively reduce osmotic pressure.

Disclosed is a process for preparing high-purity superfine zirconia by zirconium oxychloride, which comprises recrystallization purifying, charging ammonia for sedimentation, obtaining zirconium hydroxide colloid that is easy for filtration and washing, after filtering and washing, charging minute quantity of emulsifying agent, carrying out high shearing emulsification and high-energy ball grinding, thus obtaining stable hydrated zirconium dioxide with good dispersity, then drying with spraying drying apparatus, calcining to obtain crude product of high purity ultra-fine zirconium dioxide, finally subjecting the crude product to high pressure disintegration.

The invention discloses a preparation method of a high-coating-ratio zirconium silicate coated ceramic pigment. The preparation method includes the steps of: dispersing and wetting a to-be-coated substance in a zirconium tetrachloride ethanol solution to prepare a suspension liquid, and volatilizing the ethanol and drying the liquid, and performing a reaction with ammonia gas to form a zirconium hydroxide coating layer on the surface of the to-be-coated substance; mixing the to-be-coated substance with a silicon source solution, and performing gelatination/precipitation to form a silicic acid coating layer on the surface of the zirconium hydroxide coating layer; and drying the substance, mixing the substance with a mineralizing agent and calcining the substance to form the zirconium silicate coated ceramic pigment. The invention also discloses a product prepared through the method. In the invention, a core-shell structure with the to-be-coated substance as a core and the zirconium silicate as a coating layer is formed, so that the coating ratio and the coloring intensity of the coated substance are significantly increased. Meanwhile, applicability of the zirconium silicate as a coating layer material is developed, so that application and development of the zirconium silicate coating ceramic pigment are effectively promoted.

The invention discloses a 3D printing method of zirconium dioxide powder material. The method comprises the following steps: (1) slicing up and stratifying the 3D model of the product which needs to be printed to form multi-layered profile information; (2) paving a layer of zirconium dioxide powder material, movably injecting binder liquid with zirconium hydroxide nano-particles according to set procedure by an injection nozzle, and then bonding the zirconium dioxide powder material to form a profile of a layer of a part; (3) injecting binder after paving another layer of zirconium dioxide powder material on the formed profile, and then according to the above mentioned method, superimposing profiles layer by layer to form a 3D green body; (4) degreasing and sintering the green body and then conducting surface treatment to obtain a finished product. The invention further discloses a binder injection device used for the 3D printing method and a 3D printing device with the binder injection device. The invention is beneficial to obtain a 3D printed product which is high in density and reduce cost.

The invention relates to a method for producing nano zirconia, and belongs to the technical field of fine chemical engineering. The method comprises the following steps: reacting aqueous solution of zircon salt with an alkaline precipitator to form zirconium hydroxide precipitate; and filtering, washing, dehydrating, drying, and sintering the zirconium hydroxide precipitate to obtain zirconia powder. The method is characterized in that: the aqueous solution of zircon salt and the alkaline precipitator are respectively subjected to high pressure to form high speed fluid for jet mixing reaction to form the zirconium hydroxide precipitate. The method is scientific and reasonable, is convenient to implement, and can produce the nano zirconia meeting quality requirement.

The invention relates to a preparation method of zirconium dioxide powder, comprising the following steps: A. dissolving zirconium oxychloride into deionized water, and controlling mass ratio of the zirconium oxychloride and the deionized water to be 4:(21-35); B. dropwise adding ammonia water into mixed solution in the step A, and controlling mole ratio of the ammonia water and the zirconium oxychloride to be (1.8-3.7):1; C. carrying out washing, pressing and filtering or centrifugal separation on zirconium hydroxide hydrogel in the step B to obtain zirconium hydroxide gel; D. drying the zirconium hydroxide gel of the step C to obtain zirconium hydroxide, and calcining the zirconium hydroxide to obtain zirconium dioxide; E. mixing the zirconium dioxide in the step D with grinding medium and water and carrying out wet grinding on the mixture; and F. drying the zirconium dioxide slurry in the step E to prepare the zirconium dioxide powder. The zirconium dioxide powder product produced by the method has good particle monodispersity, complete particle form, concentrating distribution of particle size, high purity and controllable particle size and can realize low cost when in large-scale production of the zirconium dioxide.

The invention discloses a method for preparing 2,5-dihydroxymethyl furan through 5-hydroxymethyl furfural catalytic transfer hydrogenation. The method uses magnetic zirconium hydroxide as a catalyst, uses low carbon alcohol as a reaction solvent and a hydrogen donor, 5-hydroxymethyl furfural is selectively converted into the 2,5-dihydroxymethyl furan through Meerwein-Ponndorf-Verley (MPV) transfer hydrogenation reaction in a high-pressure reaction kettle, and the highest yield is up to 91.5%. The raw materials for the used catalyst are low in price, the preparation process is simple, and the catalytic performance is good. In addition, the 2,5-dihydroxymethyl furan has strong magnetism and is easy to separate, recycle and reuse. Furthermore, the used low carbon alcohol can serve as the in-situ hydrogen donor, hydrogen usage is omitted, and the safety of the reaction process is further improved. Moreover, the 2,5-dihydroxymethyl furan can also serve as a reaction solvent, introduction of exogenous substances is reduced, the production costs are further reduced, and the method has a high application value and a good industrialized prospect.

The invention relates to a preparation method of a loose zirconium hydroxide or zirconium oxide nano powder, and belongs to the field of inorganic nano powder preparation. The preparation method comprises the steps of preparing a precipitant A solution and a precipitant B solution which have different pH (potential of hydrogen) values, adding a zirconium salt solution to the precipitant A solution at a certain flow rate, keeping the flow rate of the zirconium salt solution and simultaneously adding the precipitant B solution to the precipitant A solution at a certain flow rate after the solution becomes clarified from turbid, ageing, filtering, cleaning and drying to obtain the loose zirconium hydroxide nano powder, and then performing roasting and cooling to obtain the zirconium oxide nano powder. Zirconium hydroxide precursor slurry prepared by the method has no colloidality and is easy to filter; the dried zirconium hydroxide nano powder has no hard aggregation; the zirconium oxide powder generated after the roasting reaches a nanoscale; the particle size is 60-100nm; a pattern is regular; the distribution is narrow; the cleaning is easy; a ball milling process is not required; technological operation is simple and convenient; an equipment requirement is low; the preparation method is suitable for large-scale industrial production.

The invention discloses a preparation method of active zirconium dioxide. The preparation method comprises the steps of firstly mixing zircon sand with a carbon reducing agent and then performing electric smelting calcining to obtain desiliconized zirconium; adding alkali and performing alkali fusion calcining to obtain sodium zirconate; hydrolyzing sodium zirconate and adding acid for neutralizing to form zirconium hydroxide and sodium salt; then adding sodium hydroxide and controlling the pH value to be 8-9; and finally washing to remove sodium salt and drying materials to obtain active zirconium dioxide. The active zirconium oxide prepared by adopting the preparation method contains zirconium dioxide of tetragonal crystal phase, has high activity and is suitable for manufacturing ferrozirconium pigment; in addition, side products generated in the preparation process does not pollute the environment and thus the environment-friendly and pollution-free effects are achieved; silicon is converted into silicon dioxide to be recycled after being subjected to electric smelting calcining; after the preparation is completed, all sodium is converted into sodium chloride or sodium sulfate to be recycled.

The invention discloses a method of preparing ZrO2 nano powder by ultrasonic sol-gel method, including the following steps: adding a certain amount of ammonia water to a reactor, and during continuously stirring, dropping in zirconium oxychloride solution at a proper speed; making ultrasonic action; ageing; washing zirconium oxychloride colloid by distilled water until no residual ions exist, and in washing, applying ultrasonic action; drying the prepared wet gel by anhydrous alcohol and grinding, burning at temperature 500-750 deg.C for 2 h and obtaining ZrO2 nano powder. It combines the ultrasonic technique with the sol-gel method to prepare ZrO2 nano powder, achieving remarkable effect and able to produce obvious social and economical benefits.

The invention relates to a method for simple and rapid preparation of a hydrogel bilayer film with high adhesion acting force, and belongs to the field of functional polymer materials. According to the method, nano aluminum hydroxide sol, nano zirconium hydroxide sol, nano clay and the like are used as crosslinkers, acrylic acid, N,N-dimethacrylamide, acrylamide, N-isopropyl acrylamide and the like are used as monomers, and in-situ free radical polymerization is used for preparing various nano complex hydrogels; based on high-strength hydrogels, a bridged polymer is prepared by activation reaction of chitosan, sodium alginate and other macromolecules with carboxyl of EDC/NHS, and the bridged polymer is bonded by self or with other hydrogels to prepare the hydrogel bilayer film with high adhesion acting force in a wet environment; the bilayer film has extremely strong adhesion acting force, simple preparation method and easy operation in preparation process, greatly expands the application of the hydrogels, and has strong application potential in intelligent bionic drive, flexible sensing parts, biomedical materials and other fields.

The invention provides a method for preparing superfine zirconia powder, wherein the superfine zirconia powder is prepared by using quaternary ammonium base as a precipitator and adopting a special precipitation method. In the special precipitation method, two types of solutions are rapidly stirred and simultaneously added into a reaction kettle to react rapidly for nucleation without ageing, and the nucleuses are directly washed with water so as to achieve the purpose of controlling the growing of the nucleuses. The quaternary ammonium base is an alkaline substance which can be used for precipitating aqueous zirconia (zirconium hydroxide gel) from a zirconium salt solution, and is also a surfactant which can change interfacial tension so as to achieve a dispersion effect, therefore the addition of a dispersing agent is omitted and the cost is saved; and meanwhile, tetragonal-phase and cubic-phase zirconia powder can be prepared as required by controlling the addition of a yttrium-containing compound.

The methyl isobutyl ketone (MIBK) double solvent extraction process of prepare zirconia and hafnium oxide in atomic energy level includes the following steps: 1. preparing dilute hydrochloric acid solution, dilute sulfuric acid solution, ammonia solution, zirconium oxychloride solution and ammonium thiocyanate solution; setting in high-level tanks separately; washing and reverse extracting; 2. mixing MIBK and extractant and extracting; 3. mixing ammonium thiocyanate solution, zirconium oxychloride solution and dilute hydrochloric acid solution; and setting the mixture in high-level tank; 4. reaction through stirring for 8 hr and multistage extraction to obtain zirconium hydroxide solution and hafnium hydroxide solution; 5. depositing zirconium hydroxide and hafnium hydroxide in ammonia water; and 6. high temperature roasting zirconium hydroxide and hafnium hydroxide to obtain zirconia and hafnium oxide. The process has high separating effect and less environmental pollution.

The invention relates to a process for synthesizing calcium zirconate by a liquid-phase and solid-phase mixed calcination method. The process comprises the following steps of: 1, mixing zirconium carbonate or zirconium hydroxide and CaCO3 or Ca (OH) 2 in a metallic oxide molar ratio of 1:1.0-1.2 by using refined water; 2, performing centrifugal separation and dehydration on the slurry; 3, loading the dehydrated mixture into a quartz crucible, feeding the quartz crucible into a tunnel kiln of which the central highest temperature is between 850 and 1,200 DEG C, and slowly warming up; and 4, discharging, cooling, crushing, and packing to obtain finished products. The moisture content of the dehydrated materials is between 40 and 50 percent. By the process, the defects of nonuniform mixing, incomplete reaction, nonuniform particles and super high energy consumption by a dry method are overcome, and the process problems of difficulty in cleaning impurities, a large amount of wastewater, drying and the like by a wet method are solved. The whole production process has short flow and simple equipment, is easy to operate and control, is suitable for large-scale production, and has high product quality and lower cost.