29results about "Lanthanide oxides/hydroxides" patented technology

The invention relates to the technical field of spherical particle dysprosium oxide, and discloses monodisperse spherical particle dysprosium oxide with the particle size smaller than 300 nm and a preparation method of the monodisperse spherical particle dysprosium oxide. The preparation method comprises the following steps: S1, a precipitate preparation process: a, preparing a dysprosium chloride-PEG mixed solution; preparing a urea solution; b, adding the dysprosium chloride-PEG mixed solution into a urea solution to obtain a primary material A mixed solution; c, heating the primary material A mixed solution in an electric furnace, keeping the temperature constant, and adjusting the pH value to obtain a precipitate A; d, aging the precipitate, discarding mother liquor, washing, and carrying out suction filtration to obtain a precipitate B; s2, a calcining process: a, putting the precipitate into a crucible, and opening a cover; b, putting the crucible into a muffle furnace for calcining, and calcining in three stages in a stepped temperature control manner; and S3, an ultrasonic process. Realizing lt; successful research and development of 300nm submicron particle rare earth dysprosium oxide not only is a size breakthrough, but also monodispersity means that the particles are highly uniform in size, morphology and composition, and the rare earth dysprosium oxide has good application prospects in the fields of catalysis, biomedicine, magnetic materials and the like.

The invention relates to a preparation method of ytterbium oxide with specific granularity and specific surface area, and belongs to the technical field of rare earth oxide preparation. The preparation method comprises the following steps: preparing oxalic acid into an oxalic acid solution with the mass fraction of 5-15wt%; preparing ytterbium chloride into an ytterbium chloride solution with the concentration of 0.2-1.0 mol / L; a polyvinyl alcohol dispersing agent solution with the mass fraction of 0.8-1.5 wt% is added into the ytterbium chloride solution, the adding amount of the polyvinyl alcohol dispersing agent solution is 2-4% of the mass of the ytterbium chloride solution, and ytterbium chloride mixed liquid is obtained; warm water is added into a reaction kettle, the ytterbium chloride mixed solution is continuously added along with stirring operation, and then the oxalic acid solution is continuously added; and directly carrying out vacuum filtration without aging, collecting a filter cake, and calcining to obtain a finished product. By optimizing the using amount of the dispersing agent and the precipitation process and accurately controlling process parameters, the obtained product is stable in performance, uniform in particle size distribution, small in specific surface area deviation and good in reproducibility.

The invention relates to the technical field of rare earth hydrometallurgy, and discloses a process for preparing ultra-high-purity rare earth oxide by an ion exchange method, which comprises the following steps: loading monodisperse polystyrene sulfonic acid resin into a chromatographic column, and carrying out constant-temperature circulating pretreatment by using a pre-swelling solution containing urea and ammonium nitrate; preparing a rare earth feed liquid containing urea and with anions being nitrate radicals, introducing the rare earth feed liquid into the chromatographic column for adsorption saturation, and then connecting the rare earth feed liquid in series with the retardation column; carrying out displacement leaching by using a composite leaching solution in which ethylenediamine tetraacetic acid, 5-sulfosalicylic acid and urea are dissolved, and collecting target rare earth effluent in sections; and finally, adding a precipitant into the effluent for precipitation, and filtering, washing and firing to obtain the ultra-pure rare earth oxide. According to the invention, a urea swelling driven dynamic compensation system is constructed, and 10%-14% of monodisperse resin with high crosslinking degree is selected to cooperate with urea-ammonium nitrate pretreatment, so that low-pressure-drop operation at a high flow rate of 1.0 BV / h or above is realized.

A method for extracting a rare earth metal from a mixture of one or more rare earth metals comprises contacting an acidic solution of the rare earth metal with a composition which comprises an ionic l

This invention relates to the field of rare earth oxide technology and provides a method for preparing rare earth oxide powder. The invention uses oxalic acid as a precipitant and employs an airflow precipitation reactor to carry out a precipitation reaction, obtaining a rare earth oxalate precursor. The oxalate precursor is then calcined to obtain rare earth oxide powder. This invention uses an airflow precipitation reactor to carry out the precipitation reaction, utilizing the disturbance effect of gas on the liquid to promote the exchange and mixing of substances during the precipitation reaction, making the precipitation reaction more uniform and complete, thereby obtaining a rare earth oxalate precursor with a smaller particle size. Calcination then yields rare earth oxide powder with a large specific surface area. Example results show that the specific surface area of ​​the rare earth oxide powder prepared by this invention reaches 20.586~52.499 m². 2 / g, and the particle size is uniform.

This invention relates to a method for preparing nano metal oxides and its use. The preparation method involves reacting a low-purity initial alloy containing the target metal element M and Al / Zn with a heated concentrated alkaline solution. Under specific reaction conditions, the initial alloy undergoes intense hydrogen evolution and Al / Zn-removal reaction, resulting in nanoscale fragmentation, followed by shape and composition reconstruction to form nano M oxides. Through further post-treatment, crystalline nano M oxides or modified nano M oxides can be obtained. This method is simple, fast, cost-effective, and suitable for large-scale production. It enables the preparation of nano metal oxides with various crystallinities, which have promising applications in fields including composite materials, catalytic materials, ceramic materials, refractory materials, advanced electronic materials, battery materials, chromogenic materials, wave-absorbing materials, wastewater degradation materials, antimicrobial materials, coatings, pigments, thermal spray materials, and sensors.

An apparatus having multiple layers includes: a nucleation inhibition coating (NIC) disposed on a first layer surface in a first portion of a lateral aspect of the apparatus; and a deposition layer comprising a deposited material disposed on a second layer surface, wherein the initial adhesion probability of the deposition layer deposited on the surface of the NIC in the first portion is significantly less than the initial adhesion probability of the deposition layer deposited on the second layer surface, such that the NIC substantially lacks a sealing coating of the deposited material, and wherein the NIC comprises a compound containing a rare earth element. The deposition layer may include a sealing coating on the second layer surface in a second portion of the lateral aspect, and / or at least one discontinuous layer of particulate structure on the surface of the NIC.

The invention provides Si-coated Yb2O3 feeding powder with a spherical core-shell structure as well as a preparation method and application of the Si-coated Yb2O3 feeding powder. The Si-coated Yb2O3 feeding powder with the spherical core-shell structure comprises a core-shell structure with Si as an inner core and Yb2O3 as an outer shell, and is prepared by coating the outer surface of Si with Yb2O3 by a slurry spraying method. The Si-coated Yb2O3 feeding powder prepared by the preparation method disclosed by the invention is complex-phase powder with a core-shell structure, and has the advantages that the powder is perfectly spherical, and a coating layer is uniform, complete and compact. The preparation method is simple in process, high in feasibility, low in cost and wide in application range; and besides the silicon bonding layer field, the method is also suitable for efficient, convenient and low-cost preparation of core-shell structure powder in other fields.

The present invention relates to the technical field of rare earth oxides and provides a method and apparatus for producing ultrafine rare earth oxide powder. The present invention involves introducing a rare earth salt solution, a precipitant solution, and a compressed gas into a centrifuge to carry out a precipitation reaction, obtaining a rare earth precipitate, which is then calcined to obtain ultrafine rare earth oxide powder. The present invention involves a continuous precipitation reaction in the centrifuge, where the rare earth salt solution and the precipitant solution pass through the centrifuge quickly, thereby reducing contact time and crystal growth time, thereby maintaining small particle size. The present invention also involves introducing compressed gas into the centrifuge, which significantly increases the turbulence of the precipitation reaction, helping the precipitate form crystal nuclei and making the precipitate less likely to change over time and grow. The precipitation reaction apparatus used in the present invention has a simple structure and requires a small equipment input. At the same time, the continuous reaction method improves production efficiency and yield, reducing production costs.

Nanoparticle-scale Dy2O3 particles have beneficial properties for ceramic and electronic applications. Disclosed herein are well-dispersed Dy2O3 particles with regular morphology and lateral sizes ranging from about 10 nm to 1 μm. The Dy2O3 particles are 10 and D 90 The DyO particles may exhibit a narrow particle size distribution, with a difference in particle size of about 0.1 μm to 1 μm. Furthermore, methods for producing these well-dispersed DyO particles are disclosed. These methods do not involve grinding to obtain the particles. Also disclosed are uses for the DyO particles.

The application discloses a neodymium oxide-indium oxide composite porous nanorod material and a preparation method and application thereof, and comprises an indium oxide porous nanorod and a neodymium oxide layer loaded on the surface of the indium oxide porous nanorod; and the indium oxide porous nanorod is assembled by indium oxide nanoparticles. The prepared neodymium oxide-indium oxide composite porous nanorod material is composed of a large number of nanoparticle accumulations, the unique micro-morphology characteristics of the material are utilized, the specific surface area and gas diffusion path of the material are significantly increased, and therefore the sensitivity and identification capability of the material to H2S gas are improved.

The film is formed using one of two film-forming materials. The first film-forming material contains: particles containing a crystal phase of a rare earth element fluoride; particles containing a crystal phase of a rare earth element oxide; and particles containing a crystal phase of a rare earth element ammonium fluoride double salt. The second film-forming material contains: particles containing a crystal phase of a rare earth element fluoride; and particles containing a crystal phase of a rare earth element oxide and a crystal phase of a rare earth element ammonium fluoride double salt. If a spray coated film is to be formed by means of thermal spraying using this film-forming material or film-forming slurry in particular, it is possible to form a rare earth element oxyfluoride spray coated film without the need for excessive heat.

The application belongs to the technical field of capacitor materials, and particularly relates to a preparation method of petal-shaped nano dysprosium oxide. A surfactant is added into a soluble dysprosium salt solution and stirred uniformly; a urea solution is added dropwise to generate a precipitate; and the petal-shaped nano dysprosium oxide is obtained through a hydrothermal reaction. The petal-shaped nano dysprosium oxide doped into an MLCC capacitor can reduce dielectric loss, and the effect of improving the performance of a barium titanate-based substrate ceramic capacitor is achieved.

The invention relates to the technical field of new rare earth materials, in particular to a preparation method of submicron sphere-like dysprosium oxide. The method comprises the following steps: diluting a DyCl3 solution to 0.5-0.001 mol / L by using deionized water, adding a regulator according to a molar ratio of 1: (0.1-10), and uniformly mixing to obtain a first solution; putting the first solution and a precipitant into a static mixer according to a molar ratio of 1: (1-1.8), and uniformly mixing at 40-80 DEG C for 0.2-1 hour to obtain a second solution; adding a surface aid into the second solution according to a volume ratio of 1: (0.01-0.5), and then putting the second solution into a high-pressure reaction kettle to react for 1-6 hours at 100-160 DEG C; after the reaction is finished, cooling, and carrying out centrifugal filtration, absolute ethyl alcohol ultrasonic oscillation washing and secondary centrifugal filtration to obtain a dysprosium oxide precursor; and reacting for 1-4 hours under the microwave roasting condition of 550-950 DEG C to obtain the spheroidic dysprosium oxide powder with the particle size of 250-500nm, thereby realizing the preparation of the submicron-scale spheroidic dysprosium oxide powder material.

An electrode for an electrochemical cell. The electrode comprising at least a first layer comprising a first electrode composition, the first electrode composition comprising Pr(1- x)LnxO(2-0.5x-δ) and a source of lithium. Ln is selected from at least one rare earth metal selected from La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y and mixtures thereof. δ is the degree of oxygen deficiency, and 0.01≤x≤0.4. An electrochemical cell comprising said electrode, and a stack of electrochemical cells, a method for producing said electrode, and said composition.

The invention relates to basic praseodymium carbonate and a preparation method thereof, and the preparation method comprises the following steps: introducing carbon dioxide gas into a praseodymium salt solution, adding an alkali solution to carry out carbonization reaction, and aging to obtain the basic praseodymium carbonate. The preparation method of the basic praseodymium carbonate is simple to operate, mild in condition and controllable in crystal form by combining a bubble dispersion technology with a carbonization reaction, so that the basic praseodymium carbonate with a good crystal form can be obtained in a relatively short time under a low-temperature condition, and effective regulation and control of the crystal form are realized by utilizing the advantage that homogeneous precipitation can be realized by a carbonization method.

The invention provides a ternary positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. The ternary positive electrode material comprises an inner core and a coating layer arranged on the surface of the inner core, the chemical general formula of the inner core is LiNiaCobMncSmxO2, x ranges from 0.005 to 0.015, a is larger than 0.585, and a + b + c + x = 1; and the coating layer comprises Dy2O3. The Dy2O3 coating layer in the ternary positive electrode material has the function of physically blocking HF, and Dy < 3 + > fills up surface oxygen vacancies through interface charge transfer, so that O2 precipitation energy barriers are reduced; the Sm < 3 + > bulk phase of the inner core is doped, the Sm < 3 + > ion radius (0.89) is close to that of Ni < 3 + >, so that the Sm < 3 + > can occupy the Ni site to form a solid solution, Li / Ni mixed arrangement is inhibited through electrostatic repulsion, meanwhile, the larger ion radius expands the interlayer spacing, and the Li < + > diffusion path is shortened.

An electrode for an electrochemical cell. An electrode comprising at least a first layer containing a first electrode composition, wherein the first electrode composition is Pr (1-x) Ln x O (2-0.5x-δ) and a lithium source. Ln is selected from at least one rare earth metal selected from La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y and mixtures thereof, and δ is the oxygen deficiency degree, 0.01 ≤ x ≤ 0.4. An electrochemical cell comprising the electrode and a stack of electrochemical cells, a method for manufacturing the electrode, and the composition.

The present application relates to the technical field of rare earth material preparation, in particular to a preparation method of superfine holmium oxide nanomaterial. The present application adopts electrochemical deposition technology, deposits holmium precursor film on the electrode surface in holmium ion-containing electrolyte by regulating electrochemical parameters, and then converts the holmium precursor film into superfine holmium oxide nanoparticles through calcination treatment. The preparation method provided by the present application can avoid the complex reaction steps in traditional chemical synthesis, realize the preparation of nanoparticle holmium oxide with controllable particle size and uniform morphology, and the process is green and environmentally friendly, the equipment is simple and easy to operate, and is suitable for large-scale production.

An electrode for an electrochemical cell. The electrode comprising at least a first layer comprising a first electrode material of composition Pdy:Pr(1-(x+y))LnxO(2-0.5x-δ). Ln is selected from at least one rare earth metal, δ is the degree of oxygen deficiency, 0.0001≤y≤0.05, and 0.01≤x≤0.4. An electrochemical cell comprising said electrode, and a stack of said electrochemical cells, a method for producing said electrode, and said composition.

The present application belongs to the technical field of wastewater treatment and rare earth recovery, and discloses a method for efficiently recovering rare earth oxides from rare earth wastewater. The method comprises the following steps: (1) adding an alkali solution and a polyacrylamide solution into the rare earth wastewater and stirring to react, filtering the reacted solution, washing and drying the precipitate to obtain a precipitate product; (2) calcining the precipitate product obtained in step (1) under an air atmosphere and at a temperature of 400-900 DEG C to obtain a rare earth oxide material. The method uses alkali solution and polyacrylamide solution to cooperatively precipitate and treat the rare earth wastewater, and combines with subsequent high-temperature calcination under an air atmosphere to obtain a rare earth oxide material with high purity and high yield. The above method is simple and efficient, has low treatment cost, and has good application prospect.

The invention relates to the technical field of rare earth oxides, and provides a preparation method of rare earth oxide powder. The preparation method comprises the following steps: by taking oxalic acid as a precipitator, carrying out precipitation reaction by adopting an airflow precipitation reactor to obtain an oxalic acid rare earth precursor, and calcining the oxalic acid rare earth precursor to obtain rare earth oxide powder. According to the method, the airflow precipitation reactor is used for carrying out precipitation reaction, substance exchange and mixing in the precipitation reaction are promoted through the disturbance effect of gas on liquid, the precipitation reaction is more uniform and sufficient, an oxalic acid rare earth precursor with the smaller particle size is obtained, and then the rare earth oxide powder with the large specific surface area can be obtained through calcination. The result of the embodiment shows that the specific surface area of the prepared rare earth oxide powder reaches 20.586-52.499 m < 2 > / g, and the particle size is uniform.

To provide a ceramic powder for obtaining a high-definition ceramic structure in a short time in the production of a ceramic structure using an additive manufacturing method in which modeling is performed by irradiating a raw material powder with laser light.SOLUTION: A ceramic powder used in an additive manufacturing method in which modeling is performed by irradiating a raw material powder with laser light, including a first particle group which consists of particles of a first inorganic compound, and whose average particle size is 10 μm or greater and 100 μm or less and a second particle group which consists of a second inorganic compound having an absorption band at the wavelength of the laser beam and having an average particle size smaller than the first particle group, and the particle included in the second particle group is disposed on a surface of the particle included in the first particle group.SELECTED DRAWING: Figure 3

The invention relates to the technical field of metal oxides, in particular to dysprosium oxide with narrow particle size distribution and a preparation method thereof. The preparation method comprises the following steps: preparing dysprosium nitrate and ammonium oxalate solutions, keeping the pH value at 3.5-4.5 in a precipitation reactor, firstly mixing part of the solutions to form crystal nucleus seed slurry, then synchronously dropwise adding the residual solution in two channels, adding an ammonium polyacrylate dispersing agent step by step in the dropwise adding process, and sequentially adding a cationic polymer solution and a nonionic polymer solution in the middle stage. After dropwise adding, the slurry is heated and aged, urea and an ammonium nitrate solution are added for combined aging, then a precursor is obtained through dilution, filtering and washing, solvent replacement and drying, and finally dysprosium oxide powder is obtained through segmented roasting. The D50 of the powder is 0.38-0.45 [mu] m, the Span is not larger than 1.3, and the powder is high in tap density, consistent in densification behavior after sintering, low in apparent porosity and suitable for high-end application such as magneto-optical ceramics.

An electrochemical cell comprises an electrode with a first layer (40) comprising Pr(1-x)LnxO(2-0.5x-δ), wherein Ln is a rare earth metal, δ is the degree of oxygen deficiency, and 0.01 ≤ x ≤ 0.4. The

A method for producing luminescent nanoparticles of the A2-xO3:Lnx type [wherein A is one or more of yttrium, scandium, aluminum, gallium, or lanthanide; Ln is at least one lanthanide; and 0 < x < 2], the method comprising: preparing a first mixture containing at least a salt of A, a salt of Ln, and a solvent; preparing a second mixture containing a precipitating agent and a solvent; contacting the first mixture and the second mixture in a microjet reactor to obtain a third mixture containing nanoparticles; and heating the nanoparticles. A composition containing the nanoparticles obtained by this method and its applications are also provided.

The film is formed using one of two film-forming materials. The first film-forming material contains: particles containing a crystal phase of a rare earth element fluoride; particles containing a crystal phase of a rare earth element oxide; and particles containing a crystal phase of a rare earth element ammonium fluoride double salt. The second film-forming material contains: particles containing a crystal phase of a rare earth element fluoride; and particles containing a crystal phase of a rare earth element oxide and a crystal phase of a rare earth element ammonium fluoride double salt. If a spray coated film is to be formed by means of thermal spraying using this film-forming material or film-forming slurry in particular, it is possible to form a rare earth element oxyfluoride spray coated film without the need for excessive heat.

A coating film is formed using a film-forming material containing particles including a crystal phase of a rare earth element fluoride, particles including a crystal phase of a rare earth element oxide, and particles including a crystal phase of a rare earth element ammonium bifluoride complex salt, or a film-forming material containing particles including a crystal phase of a rare earth element fluoride and particles including a crystal phase of a rare earth element oxide and a crystal phase of a rare earth element ammonium bifluoride complex salt. In the film-forming material or film-forming slurry of the present application, particularly if a spray coating film is formed using the film-forming material or film-forming slurry using spraying, a rare earth element oxyfluoride spray coating film can be formed without requiring excess heat, so that even under the atmosphere, the progress of an oxidation reaction caused by spraying heat is suppressed, while a rare earth element oxyfluoride spray coating film having little rare earth element fluoride and rare earth element oxide is obtained, and in addition, film peeling caused by excess heat can be suppressed.

A polishing liquid for polishing undoped silicate glass, the polishing liquid having a pH of 3.0 or more. A polishing method including a step of polishing a surface to be polished of a member to be polished containing undoped silicate glass by using the above-described polishing liquid. A method for manufacturing a component, including obtaining a component by using a polished member polished by the above-described polishing method.