449results about "Zirconium oxides" patented technology

The invention discloses acid-resistant calcium carbonate and a preparation method thereof, and belongs to the technical field of calcium carbonate filler production. According to the invention, industrial waste carbide slag is used as a calcium source, and calcium hydroxide slurry is obtained through impurity removal; then adding sodium polyacrylate and sodium hexametaphosphate, stirring and dispersing, then introducing carbon dioxide for carbonization, adding a surfactant for ultrasonic activation after carbonization, and finally sequentially adding zirconium oxychloride and sodium silicate to prepare the acid-resistant calcium carbonate. The defects of traditional silicon dioxide and titanium dioxide coated calcium carbonate products are overcome, the prepared calcium carbonate product is compact and uniform in coating layer and good in stability, meanwhile, excellent acid resistance and mechanical property are considered, the calcium carbonate can be suitable for more acid environments, and the application range of calcium carbonate is effectively widened.

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the lithium manganese iron phosphate positive electrode material provided by the invention, the amorphous precursor and the high-crystallization precursor are used as raw materials, and the high-crystallization precursor causes a relatively high specific surface area of the material and affects the processability; the amorphous precursor can improve the compaction density and the specific surface area of the material, and the capacity and the cycle performance of the lithium manganese iron phosphate positive electrode material are ensured by combined use of the two precursors. The combination of elements with different valence states is used, so that the doping and coating effects are achieved at the same time, and the performance of the material is synergistically improved; elements with relatively low valence states are easily doped in a lithium manganese iron phosphate crystal structure, so that the capacity of the material is improved; and elements with relatively high valence states are distributed on the surfaces of lithium manganese iron phosphate particles, so that the stability of the surface structure of the material is improved.

This invention discloses a method for preparing high-purity zirconium oxide, belonging to the field of compound preparation technology. The method provides a breakthrough adjustment of the final concentration state and the cooling process after concentration and evaporation of an acidic zirconium oxychloride solution under the action of an oxidant. Simultaneously, crystallization is achieved through a two-stage concentration and evaporation process, followed by calcination to obtain hafnium-free zirconium oxide. The resulting zirconium oxide not only has a high yield but also high purity. Furthermore, the technical solution of this invention avoids the generation of ammonia nitrogen wastewater as in existing technologies, thus not only avoiding environmental impact but also significantly reducing production costs through the recycling of hydrochloric acid condensation, achieving a green and environmentally friendly effect.

To provide a calcined body that is processed easier than a conventional calcined body and where differences in hardness between production lots are suppressed.SOLUTION: A calcined body comprises: at least one first transition metal element selected from the group consisting of manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), and silver (Ag); a coloring element of at least one of a lanthanoid rare earth element and a second transition metal element different in kind from the first transition metal element; and zirconia containing a stabilizing element. A content of the first transition metal element is 100 mass.ppm or more, a content of the second transition metal element is less than 100 mass.ppm, and an absolute value of a difference in hardness relative to a hardness of a calcined body obtained from a commercially available powder is 10 HV or less.SELECTED DRAWING: None

The invention provides a coated modified lithium cobalt oxide material, a preparation method thereof, a positive electrode and a lithium ion battery. The preparation method comprises the following steps: providing a mixture, wherein the mixture sequentially comprises first lithium cobalt oxide particles, a coating agent and second lithium cobalt oxide particles from bottom to top; sequentially carrying out first mixing, second mixing and third mixing on the mixture; and sintering to obtain the coated modified lithium cobalt oxide material. The D50 particle size of the first lithium cobalt oxide particles is larger than that of the second lithium cobalt oxide particles; the mixing rotating speeds of the first mixing, the second mixing and the third mixing are sequentially increased. In the lithium cobalt oxide coating modification process, the positions of the first lithium cobalt oxide particles, the second lithium cobalt oxide particles and the coating agent in the mixture in the vertical direction are designed to form a sandwich structure, and a three-stage mixing process is combined, so that the mixing uniformity of the coating agent and the lithium cobalt oxide material is remarkably improved, and the coating performance of the lithium cobalt oxide material is improved. And uniform coating of the coating element on the surface of the lithium cobalt oxide material is realized.

The invention provides a PDA-ZrO2 coated zinc anode, a preparation method thereof and a battery, and belongs to the technical field of electrochemical energy storage materials. According to the zinc anode, a polydopamine-zirconium dioxide composite protective layer is constructed on the surface of a zinc substrate. According to the composite layer, a polydopamine bottom layer is formed through self-polymerization of dopamine on the surface of the zinc foil, and then a zirconium dioxide layer is introduced on the polydopamine bottom layer through an in-situ mineralization method. The PDA-ZrO2 composite layer disclosed by the invention has the main advantages that the PDA-ZrO2 composite layer ingeniously combines the strong adhesive force, excellent flexibility and ion regulation and control capability of polydopamine and the high mechanical strength and chemical stability of zirconium dioxide. The synergistic effect of'soft and hard combination 'can effectively homogenize zinc ion flow, inhibit dendritic crystal growth and block side reaction caused by water molecules, so that the interface stability of the zinc metal anode is remarkably improved, and the cycle life of the zinc metal anode is remarkably prolonged. The preparation method is simple in process, mild in condition and easy for large-scale production.

To provide an electrolyte particle for use in the manufacture of a solid oxide electrochemical cell, which is a solid electrolyte sintered body constituting a solid oxide electrochemical cell and which can be efficiently manufactured by sintering a densified sintered body having a high relative density at, for example, 1200°C or lower, and a dispersion liquid containing the electrolyte particle.SOLUTION: The present invention relates to an electrolyte particle containing at least one selected from (A) stabilized zirconia consisting of 3.0 to 10.0 mol% scandium oxide, 0 to 2.0 mol% cerium oxide, and 88.0 to 97.0 mol% zirconium oxide, (B) stabilized zirconia consisting of 0.5 to 15.0 mol% yttrium oxide and 85.0 to 99.5 mol% zirconium oxide, and (C) stabilized zirconia consisting of 0.5 to 15.0 mol% ytterbium oxide and 85.0 to 99.5 mol% zirconium oxide, and having a volume average particle diameter of 50 to 150 nm measured using a laser diffraction method.SELECTED DRAWING: Figure 1

The purpose of the present disclosure is to provide a method for recovering a solid state electrolyte from an all-solid-state battery, which simultaneously recovers rare metals through a hydrometallurgical process. In order to achieve the purpose, an aspect of the present disclosure provides a method for recovering a solid state electrolyte from an all-solid-state battery, the method comprising steps of: (a) crushing or grinding the all-solid-state battery; (b) acid leaching the crushed or ground all-solid-state battery to form a leaching solution; (c) adding a first precipitant to the leaching solution to separate the leaching solution into a first precipitate and a first leachate; (d) adding a pH modifier to the first leachate to separate the first leachate into a second precipitate and a second leachate; and (e) adding a second precipitant to the second leachate to recover a third precipitate.

The invention discloses a flame synthesis preparation system and method for a yttrium-stabilized zirconia nano-powder material. The system comprises a flame synthesis module, a raw material conveying module and a powder collecting module, the method comprises the following steps: 1, preparing a precursor solution synthesized by atomizing zirconium oxide nano powder; 2, preparing a precursor solution synthesized by atomizing yttrium oxide nano powder; and step 3, performing atomization synthesis to obtain the yttrium-stabilized zirconia powder material. According to the flame synthesis preparation system and method for the yttrium-stabilized zirconia nano-powder material, the high-performance nano-powder material is synthesized by adopting an atomized flame synthesis method, and the flame synthesis preparation system and method have the advantage that zirconia and yttrium oxide are uniformly doped.

The invention discloses a method for preparing hafnium oxide from hafnium oxalate feed liquid through an oxidation precipitation method, and belongs to the technical field of hydrometallurgy. The specific method comprises the following steps: adding an oxidizing agent into hafnium oxalate feed liquid to destroy oxalate ions in hafnium oxalate so as to enable hafnium to form hydroxide precipitates; and separating the generated white precipitate, and roasting at high temperature to obtain hafnium oxide. The strong oxidant used in the method is low in cost, high in precipitation efficiency, green, environmentally friendly, free of large pollution to equipment and the environment and wide in application range. The method is simple in process, does not involve a complex process flow, does not need precise equipment, avoids a large amount of alkali liquor required by metal ion precipitation, is simpler in process flow, higher in efficiency and lower in cost, avoids the generation of a large amount of wastewater, and is very environment-friendly. And meanwhile, the process is wide in application range and suitable for various oxalic acid metal feed liquid.

The invention relates to the technical field of battery positive electrode materials, discloses a manganese-based battery positive electrode material precursor as well as a preparation method and application thereof, and belongs to the technical field of battery preparation. According to the technology for preparing the manganese-based battery positive electrode material precursor, a solid-phase method is mainly adopted, a high-temperature melting technology is adopted, the manganese-based positive electrode material is subjected to doping modification through multiple elements at the same time, then surface coating is carried out, the density of the synthesized positive electrode material is improved, the structural stability of the synthesized positive electrode material is enhanced, and the morphology, the crystal face and the crystal boundary of the positive electrode material are optimized; the side reaction between the crystal interface of the positive electrode material and electrolyte is inhibited, the service life is prolonged, and the safety performance during use is enhanced. A small amount of water vapor and carbon dioxide gas generated in the preparation process are discharged at high altitude, so that the environment is not polluted.

The invention discloses a preparation method of a bifunctional heterojunction catalyst for AEM electrolyzed water. The method comprises the following steps: step 1, mixing multi-walled carbon nanotubes, deionized water, absolute ethyl alcohol and inorganic acid; step 2, putting the mixed solution in the step 1 into an ultrasonic machine to form a porous structure and more active adsorption sites; step 3, carrying out freeze drying treatment on the mixed solution treated in the step 2; step 4, mixing the dried multi-walled carbon nanotubes with acetylacetone salt, and uniformly grinding the mixed powder; and step 5, putting the powder obtained in the step 4 into a tubular furnace, and carrying out heat treatment in the atmosphere of H2 / Ar to obtain the PtFeCoNiMoZr / ZrO heterojunction catalyst. The catalyst has a remarkable catalytic effect on HER and OER reactions, and meanwhile, stable electrolysis which stably runs for 200 hours in an AEM electrolytic cell under the current density of 1200 mA / cm < 2 > is successfully realized.

The invention relates to nano-scale special zirconia powder and a preparation method thereof, and the preparation method comprises the following steps: S1, adding zircon salt, micromolecular polyol, a chelating agent, a surfactant and propylene glycol dimethyl ether into deionized water to prepare a zircon salt solution; s2, dropwise adding the zirconium salt solution into a precipitant for precipitation reaction; s3, octanoic acid is added, stirring is conducted for 1-2 h, ultrasonic treatment is conducted for 20-30 min, and Zr (OH) turbid liquid is obtained; s4, enabling the Zr (OH) turbid liquid to pass through an ion resin column, then acidifying, filtering and washing for multiple times; s5, carrying out ball milling treatment; s6, spraying powder and drying; and S8, calcining to obtain the nano-scale special zirconium oxide powder. According to the nanoscale special zirconium oxide powder and the preparation method thereof, the problems of purity, dispersity and crystal phase stability of nano zirconium oxide are solved through precipitant optimization, purification optimization, low-temperature crystal phase control and the like, a reliable path is provided for industrial production, and the application prospect is wide.

There is provided a layered body that has gradations in translucency and color allowing the layered body to give an impression similar to that of natural teeth and with which the chipping of the surface layer (layer closer to the incisal edge of the dental restoration) can be reduced.The layered body comprises a surface layer containing zirconia containing at least one stabilizing element and a composition-gradient layer composed of two or more unit layers. The unit layers each contain at least one coloring element and zirconia containing at least one stabilizing element, and the composition-gradient layer is constructed as a result of the unit layers being stacked in such a manner that the amount of the stabilizing element in the zirconia containing at least one stabilizing element contained in the composition-gradient layer remains unchanged or decreases from the surface layer toward the surface of the layered body opposite the surface layer. The amount of the stabilizing element in the zirconia containing at least one stabilizing element contained in the surface layer is smaller than the amount of the stabilizing element in the zirconia containing at least one stabilizing element contained in a first composition-gradient layer, which is one of the unit layers constituting the composition-gradient layer and is adjacent to the surface layer.

The invention discloses a method for preparing high-zirconium-content silicon carbide from lignite, and relates to a preparation method of high-zirconium-content silicon carbide. The invention aims to solve the problems of non-uniform product distribution and poor performance improvement effect caused by the fact that zirconium compounds are introduced by adding the zirconium compounds into existing silicon carbide in the later period. The method comprises the following steps: 1, preparing a zirconic acid organic matter solution; 2, uniformly mixing a silicon source and lignite powder, adding the mixture into the zirconic acid organic matter solution, quickly adding deionized water, and stirring and reacting at room temperature; 3, high-temperature calcination; 4, removing carbon; and 5, grinding, sieving and carrying out ultrasonic treatment. The method is used for preparing the high-zirconium-content silicon carbide from the lignite.

The invention discloses a bismuth oxide-based fuel cell electrolyte material and a preparation method thereof, and relates to the technical field of cell electrolyte materials. The material is composed of a trication-doped delta-Bi2O3 core and a zirconium oxide coating layer, the trication-doped delta-Bi2O3 core is co-doped with erbium, tungsten and aluminum ions, and the material comprises the following components in parts by mass: 75-80 parts of bismuth oxide (Bi2O3); 14 to 19 parts of erbium oxide (Er2O3); 1 to 3 parts of tungsten oxide (WO3); 1 to 3 parts of aluminum oxide (Al2O3); the zirconium oxide coating layer is formed by a coprecipitation method, and the thickness of the zirconium oxide coating layer is 5-20nm, so that the technical problems that the working temperature range of delta-Bi2O3 is difficult to broaden, and the low-temperature phase change and reduction under low oxygen partial pressure are difficult to inhibit are solved.

A ZrO2 dispersion liquid containing, a ZrO2 particle coated with a silane coupling agent, and a dispersion medium for the ZrO2 particle, wherein a BET specific surface area of the ZrO2 particle coated with the silane coupling agent obtained by removing the dispersion medium is 36% or more of a BET specific surface area of the ZrO2 particle before coating with the silane coupling agent.

This invention provides a zirconia-based porous body having a pore diameter suitable for supporting catalytic active species, such as precious metals, small variability in pore diameter, and a sufficient specific surface area even after 12-hour heating at 1000°C. Specifically, the invention provides a zirconia-based porous body in particle form having (1) a pore diameter peak at 20 to 100 nm in the pore distribution by BJH method, a P / W ratio of 0.05 or more wherein W represents half width of the peak and P represents height of the peak in the measured pore distribution curve, and a total pore volume of 0.5 cm3 / g or more; and (2) a pore diameter peak at 20 to 100 nm, the P / W ratio of 0.03 or more, a specific surface area of at least 40 m2 / g, and a total pore volume of 0.3 cm3 / g or more, after heat treatment at 1000°C for 12 hours.

Provided herein are methods and systems for extracting zirconium and / or other impurities from a strontium-containing mixture. A method for removing zirconium from a mixture including zirconium and strontium can include converting at least a portion of a Zr-containing precursor to ZrF4 in the mixture, converting at least a portion of a Sr-containing precursor to SrF2 in the mixture, solubilizing at least a portion of the ZrF4 and / or the SrF2 in a solvent to create a solution, and / or separating at least a portion of the solubilized ZrF4 and / or at least a portion of the solubilized SrF2 from the mixture.

Provided is at least one of: a powder capable of providing zirconia sintered bodies that contain manganese as a main coloring element, assume a black color, have high fracture toughness, and exhibit only a small variation in color tone due to different sintering temperatures; and a method for producing the powder. The powder of the present disclosure is a powder containing zirconia containing yttrium as a stabilizing element, a manganese compound and alumina. The content of the stabilizing element in terms of oxide is 1.3 mol% or more and less than 2.0 mol% based on the total amount of the zirconia and the stabilizing element in terms of oxide. The content of the alumina is 0.2% by mass or more and 1.5% by mass or less based on the total mass of the powder, and the content of the manganese compound is 0.1 % by mass or more and 0.6% by mass or less based on the total mass of the powder.

Disclosed is a ceramic reversible cell which contains at least one substance selected from the group consisting of perovskite type metal oxides, hydrates of the perovskite type metal oxides, and hydrides of the perovskite type metal oxides, wherein: the at least one substance selected from the group consisting of perovskite type metal oxides, hydrates of the perovskite type metal oxides, and hydrides of the perovskite type metal oxides contains A (wherein A is at least one element selected from the group consisting of Ba, Sr and Ca), B (wherein B is at least one element selected from the group consisting of Zr, Sn, Ce, Ti and Hf) and M (wherein M is at least one element selected from the group consisting of In, Fe, Cr and Mn) as main metal atoms; and hydride ions are contained therein when equilibrium is reached by bringing dried hydrogen into contact with the ceramic reversible cell, the dried hydrogen satisfying a specific formula and having a moisture content of 20 ppm or less in terms of volume ratio at 500°C to 900°C.

The present invention discloses a method for preparing ultra-high temperature ceramic hollow microspheres, which comprises the following steps: performing solvothermal treatment on a precursor solution containing zirconium silicate solution and phenolic resin to obtain precursor microspheres; and calcining the precursor microspheres in segments to obtain ultra-high temperature ceramic hollow microspheres. The ultra-high temperature ceramic hollow microspheres prepared by the present invention, during high-temperature service, near the phase transition temperature of zirconia, the phase transition of zirconia ceramics occurs, and the microspheres are prone to rupture in a high-temperature thermal shock environment. And the silica softened near this phase transition temperature becomes a buffer medium for volume shrinkage and expansion during the temperature change process, ensuring the integrity of the hollow microspheres. Moreover, the zirconia-silica composite ultra-high temperature ceramic hollow microspheres of the present invention have excellent heat resistance. The components zirconia / silica contained in the coating are common high-temperature oxide systems, and the melting point of zirconia is as high as 2700 °C.

Provided are: a method for producing a proton-containing oxide, the method comprising reacting a basic oxide with a carboxylic acid melt having at least pKa4 and introducing a proton into the basic oxide to obtain a proton-containing oxide; a dense body of a proton-containing basic composite oxide; a fuel cell; a hydrogen production cell; a hydrogen sensor; or an ammonia synthesis cell; and methods for producing the same.

To provide at least any of a zirconia sintered body of a solid solution of titanium and yttrium with fracture being difficult to propagate as compared to a zirconia sintered body of a solid solution of titanium and yttrium showing transparency and also showing transparency, a manufacturing method thereof, and use thereof.SOLUTION: A zirconia sintered body of a solid solution of titanium and yttrium has a content of yttrium of 3.5 mol% or over and under 6.0 mol%, a content of titanium of 6.0 mol% or over and 18.5 mol% or under, a straight transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm of 45% or over, a ratio of a straight transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm to a total light transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm of 0.70 or over, and a fracture toughness value (KIC) of 1.5 MPa m0.5 or over.SELECTED DRAWING: Figure 1

Disclosed are methods of dehydrogenating a light alkane gas (and / or light alkene gas), which include adding hydrogen (H2) to the light alkane gas (and / or light alkene gas) in the presence of a catalyst composition containing zirconium oxide. Also disclosed are catalyst compositions containing zirconium oxide and methods of preparation thereof, where the catalyst compositions are useful in methods of dehydrogenating light alkane gas.

The application discloses a preparation method of single tetragonal phase zirconia stable at high temperature and ultrahigh temperature. 10 H 14 N2Na2O8 or C 10 H 12 N2Na4O8 as a reaction chelating agent, low-temperature water bath is used to prepare single tetragonal phase zirconia precursor powder, and finally single tetragonal phase zirconia is prepared after high-temperature and ultrahigh-temperature calcination; the application mainly uses common inorganic salts and simple chelating agents, is low in cost, simple and easy to operate, good in repeatability, green and safe, suitable for large-scale production, and can realize that the prepared product is single tetragonal phase zirconia after high-temperature and ultrahigh-temperature calcination, and realizes that the tetragonal phase is stable in a high-temperature and ultrahigh-temperature temperature range.

A heavy metal pollution-resistant catalyst and its preparation method. The catalyst comprises, on a dry basis, 10-70% by weight of a cracking-active component, 1-20% by weight of a zirconium oxide binder, 1-20% by weight of a silica sol binder, 0-50% of an alumina-based binder, and 10-70% by weight of clay. The catalyst preparation method comprises slurrying the cracking-active component, binder, and clay, followed by spray drying. The catalyst is used in heavy oil catalytic cracking reactions and exhibits excellent resistance to metal pollution while achieving a high heavy oil conversion rate.

To provide a liquid composition for forming a BCTZ film, which can control the crystal particle size and form a BCTZ film with stable properties, a method for producing the liquid composition for forming a BCTZ film, and a BCTZ film, and a method for producing the BCTZ film.SOLUTION: A liquid composition for forming a BCTZ film is provided, in which barium carboxylate, calcium carboxylate, a titanium alkoxide and a zirconium alkoxide are mixed in an organic solvent in a molar ratio of Ba:Ca:Ti:Zr=(1-X):X:(1-Y):Y (0.03≤X≤0.20, 0.05≤Y≤0.25) and a stabilizer is added. The barium carboxylate and calcium carboxylate are metal salts of carboxylic acids represented by the general formula CnH2n+1COOH (5≤n≤7). The organic solvent is a mixed solvent containing a carboxylic acid and an acetate.SELECTED DRAWING: None

The present invention discloses a production process of zirconium oxychloride and zirconium oxychloride. The process comprises the following steps: 1) Using zirconium tetrachloride as a raw material, preparing a first zirconium oxychloride solution; 2) Using high-purity zirconium oxychloride as a raw material, preparing a second zirconium oxychloride solution; 3) Simultaneously starting natural cooling for the first zirconium oxychloride solution and the second zirconium oxychloride solution. After the second zirconium oxychloride solution starts to crystallize, adding a preset mass of the second zirconium oxychloride solution to the first zirconium oxychloride solution to obtain a mixed solution; 4) Naturally cooling the mixed solution, and after crystallization, obtaining zirconium oxychloride crystals. The process of the present invention starts from a zirconium oxychloride solution, controls the crystallization process, reduces the impurity content in zirconium oxychloride, and improves the quality of zirconium oxychloride. The zirconium oxychloride of the present invention controls the crystallization process during crystallization, obtains crystals with higher purity, reduces the number of crystallization times, thereby achieving the improvement of the quality of zirconium oxychloride products and indirectly reducing the production cost of enterprises.

The present invention provides a method for producing an inorganic particle-containing slurry, by which the number of coarse particles can be sufficiently reduced. The present invention is a method for producing an inorganic particle-containing slurry, which comprises: a step of preparing an inorganic particle dispersion containing inorganic particles and a dispersing medium, and having a pH less than the isoelectric point of the inorganic particles; and a step of adding an alkaline compound to the inorganic particle dispersion in such a manner that the pH does not reach the isoelectric point of the inorganic particles.