60results about "Lanthanide oxides/hydroxides" patented technology

The invention relates to the technical field of rare earth metal separation, and particularly discloses a praseodymium neodymium oxide separation and purification process and a regeneration system. The process comprises the following steps: after H2S is subjected to impurity removal and filtration, carrying out multi-stage counter-current extraction by adopting a P507 / TRPO synergistic extraction organic phase, carrying out graded reverse extraction on praseodymium by HCl, and carrying out reverse extraction on neodymium by HNO3; the regeneration system comprises a wastewater treatment unit and an organic phase regeneration unit, wastewater is recycled through neutralization precipitation, precision filtration and reverse osmosis, and an organic phase is subjected to alkali washing, acid activation and 4A molecular sieve dehydration circulation. The praseodymium-neodymium separation coefficient reaches 2.0-2.2 through synergistic extraction, and the stage number is reduced by 40%; the double regeneration systems reduce the organic phase loss to be less than or equal to 2% and the wastewater reuse rate to be greater than or equal to 92%; the purity of the prepared neodymium oxide is greater than or equal to 99.99% and Fe is less than or equal to 10ppm. According to the method, the extraction efficiency is remarkably improved, the service life of an organic phase is multiplied, the product purity breaks through the limit, near-zero wastewater discharge is closed, the whole process stability is guaranteed, and the resource utilization rate is maximized.

The present invention discloses a preparation method and application of nano-dysprosium oxide particles, belonging to the technical field of rare earth material preparation. The preparation method comprises the following steps: preparing a dysprosium nitrate solution; adding deionized water to a reactor, heating the temperature to 50-70°C, and adding a surfactant; slowly adding the dysprosium nitrate solution dropwise for 2-3 hours, controlling the temperature to 50-70°C, adding an ammonium carbonate solution dropwise to control the pH of the system to 5.5-7.5, stirring for 1-2 hours after the addition is completed, obtaining a white precipitate, filtering, and washing to obtain a wet product; and roasting, crushing, and sieving the wet product to obtain nano-dysprosium oxide. The present invention avoids the agglomeration of dysprosium oxide particles during the co-precipitation process by using a prepared polymer surfactant, and the prepared nano-dysprosium oxide particles are uniform in size, have a high specific surface area, and have long-term storage stability.

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 belongs to the technical field of batteries, and provides a modified high-nickel ternary positive electrode material and a preparation method and application thereof, the modified high-nickel ternary positive electrode material comprises an inner core and a coating layer coating the inner core; the inner core comprises a gradient-doped high-nickel ternary material, a doped element comprises a samarium element, and the doping concentration of the samarium element is gradually increased from the center of the inner core to the surface of the inner core; the coating layer comprises a carbon layer, and samarium oxide particles are dispersed in the carbon layer. By forming gradient doping of the metal element samarium and utilizing 4f orbital electrons of Sm < 3 + >, H2-H3 phase change of the high-nickel ternary material can be inhibited, the layered structure of the material can be stabilized, lattice defects can be introduced, Li < + > transmission can be promoted, and diffusion energy barriers can be reduced. Meanwhile, the carbon layer doped with the samarium oxide particles is adopted for coating, on one hand, electrolyte corrosion is effectively inhibited, and on the other hand, the samarium oxide particles can further stabilize lattice oxygen and enhance electron conduction.

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.

To provide a rare earth oxide fine powder capable of: being easily dispersed without an intense crushing process; forming a thin coating film; or obtaining a highly dispersed slurry without the use of a dispersing agent, thereby maintaining a stable transparency.SOLUTION: The present invention relates to powder of oxides of a rare earth element other than Ce, which satisfies (a) or (b). (a) A primary particle diameter is 10 to 60 nm, satisfying (I) or (II). (I) D100 measured by ultrasonic dispersion is 1 to 10 μm. (II) When the true density is ρ, a difference between porosity PAD(%) calculated from the initial bulk density AD and porosity PTD(%) calculated from the tapped bulk density TD is 2.0 to 5.0%. PAD=(1-AD / ρ)×100 PTD=(1-TD / ρ)×100 (b). A primary particle size is 10 nm or larger and smaller than 100 nm, satisfying (III) and (IV). (III) A value obtained by multiplying a pore volume of 0.005 to 100 μm in pore diameter by the true density is 3 to 14. (IV) A value obtained by multiplying a pore volume of 5 to 50 nm in pore diameter by the true density is 0 to 2.0.SELECTED DRAWING: None

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.

The invention discloses a preparation method of a quaternary EuFeO3 / Eu2O3 / Fe-C aerogel wave-absorbing composite material, and relates to a preparation method of an aerogel wave-absorbing material. The invention aims to solve the technical problem of poor microwave absorption performance of the existing aerogel wave-absorbing material. The quaternary composite aerogel material EuFeO3 / Eu2O3 / Fe (at) C with a 3D network structure is prepared by changing the form of MOFs and taking 3d-4f-MOG / HCNT gel formed by self-assembly of metal organic gel and carbon nanotubes HCNTs with a spiral structure as a precursor. The quaternary heterogeneous interface can generate a large amount of electron transfer and abundant spin orbit interaction, and the carbon nano tube has a carbon component and a polarization center, so that the polarization loss and the conductive loss are greatly improved. In addition, the spiral structure can induce cross polarization under continuous microwave irradiation, so that the electromagnetic loss of the aerogel material is enhanced, and attenuation of electromagnetic waves is facilitated.

The invention discloses a method for producing a rare earth oxide and the rare earth oxide.The method comprises the steps that a rare earth mineral raw material is dissolved with hydrochloric acid to form a hydrochloric acid rare earth solution, then the hydrochloric acid rare earth solution enters an extraction tank to be separated, a nitric acid solution is added into a reverse extraction section to form nitric acid rare earth, and then the nitric acid rare earth solution is concentrated with an MVR evaporator; a rare earth nitrate solution with the content of 60-86% and a nitric acid solution are formed, the nitric acid solution is recycled, the rare earth nitrate solution enters a spray dryer and is decomposed into a rare earth oxide product and nitric oxide waste at the temperature of 800-950 DEG C, nitric oxide generated in the MVR concentration stage and the spray drying stage is recycled into a nitric oxide treatment device in a centralized mode, and the nitric oxide waste is recycled. And reacting with carbon at high temperature to form nitrogen, and discharging after reaching the standard. The method for producing the rare earth oxide disclosed by the invention does not need a precipitator, is energy-saving and environment-friendly, and the prepared rare earth oxide is stable in quality.

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.

The invention discloses a preparation method of 5N-grade ultra-pure lutetium oxide, which comprises the following steps: removing thorium and uranium from a lutetium chloride solution, carrying out primary precipitation with oxalic acid, firing to obtain a primary lutetium oxide product, re-dissolving the primary lutetium oxide product with nitric acid, carrying out secondary precipitation with ammonia water, and firing to obtain the 5N-grade ultra-pure lutetium oxide. According to the method disclosed by the invention, the preparation of lutetium oxide with higher purity can be realized by combining extraction with impurity grading removal of oxalic acid-ammonia water double precipitation so as to meet quality index requirements required by application of materials with higher performance. The preparation method is high in stability, high in yield and suitable for industrial production and application.

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.

Dy2O3 particles of a nanoparticle scale have beneficial properties for ceramic and electronic uses. Disclosed herein are moderately dispersed Dy2O3 particles having regular morphology and lateral size ranging from about 10 nm to 1 μm. The Dy2O3 particles may exhibit a narrow particle size distribution such that the difference between D10 and D90 is about 0.1 μm to 1 μm. Further disclosed are processes of producing these moderately dispersed Dy2O3 particles. These processes do not include grinding to obtain the particles. Also disclosed herein are uses for these Dy2O3μ particles.

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 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.

The present application relates to a technical filed of energy sources and illumination, and discloses a rare earth oxide nanosheet composite modified by an organic ligand, a preparation method and an organic light-emitting diode (OLED) luminescent film. The rare earth oxide nanosheet composite modified by the organic ligand is obtained by adding the organic ligand in the rare earth nanosheet sol for ultrasonic coordination; and a mole ratio of the rare earth nanosheet sol to the organic ligand is 1:(3-9).

An electrode for an electrochemical cell. The electrode comprises at least a first layer comprising a first electrode composition comprising Pr (1-x) LnxO (2-0.5 x-delta) and a lithium source. Ln is selected from at least one rare earth metal selected from the group consisting of La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y and mixtures thereof. Delta is oxygen deficit degree, 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.

This invention discloses a method for the industrial production of high-purity neodymium oxide, relating to the field of rare earth hydrometallurgy. The method is implemented using equipment for industrial production of high-purity neodymium oxide, which includes a shell assembly. Inside the shell assembly is a drive mechanism, and inside the drive mechanism is a sealing mechanism. Outside the drive mechanism, from top to bottom, are a suction mechanism and a supporting rotation mechanism. This invention allows for the calcination of the solid phase after the liquid phase transfer. Simultaneously, the solid phase can be stirred during calcination, accelerating the calcination speed while preventing agglomeration. Furthermore, after calcination, centrifugal force can be used to effectively output the neodymium oxide product, avoiding residue. This improves the production efficiency of neodymium oxide while reducing production costs and ensuring a high-purity neodymium oxide yield.

The present disclosure provides a rare earth oxide recovery method in which a boron-free flux is used. The present disclosure relates to a rare earth oxide recovery method for recovering a rare earth oxide from waste that includes a rare-earth-element-containing material. The recovery method has: a melt preparation step (1) for melting, by heating, the aforementioned waste and at least one oxide selected from the group consisting of alkali metal oxides and alkaline earth metal oxides to prepare a melt containing at least a rare earth oxide, the aforementioned oxide, and an oxide of an easily oxidizable metal; and a separation step (2) for separating, from the melt, a rare-earth-enriched phase in which the rare earth oxide is concentrated in the oxide, and an Fe-C phase.

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 invention belongs to the field of pharmacy and materials, and relates to a green chemical method for preparing a water-soluble nano metal oxide and application, the method comprises the following steps: firstly, forming a eutectic compound by using sugar and a complexing agent, then reacting with metal ions and alkali in an aqueous solution, and preparing the water-soluble nano metal oxide in one step by using the eutectic compound as a stabilizer. The aqueous solution of the nano metal oxide can be kept stable, is uniform and clear and does not generate aggregation and precipitation, and the synthesis process can be used for preparing various water-soluble metal oxides, has the characteristics of simple preparation process, no use of organic solvents, greenness, environmental protection and low toxicity, and is suitable for industrial mass production.

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 invention relates to the technical field of rare earth material preparation, in particular to a preparation method of a superfine holmium oxide nano material. According to the method, an electrochemical deposition technology is adopted, a holmium precursor film is deposited on the surface of an electrode in an electrolyte containing holmium ions by regulating and controlling electrochemical parameters, and then the holmium precursor film is converted into the superfine holmium oxide nanoparticles through calcination treatment. The preparation method provided by the invention can avoid complex reaction steps in traditional chemical synthesis, realizes preparation of nano holmium oxide with controllable particle size and uniform morphology, and is green and environment-friendly, simple and feasible in equipment and suitable for large-scale production.

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.

An electrode for an electrochemical cell. The electrode comprises at least a first layer comprising a first electrode material, the first electrode material being a composition Ppy: Pr (1-(x + y)) LnxO (2-0.5 x-delta). Ln is selected from at least one rare earth metal, delta is oxygen deficit degree, y is greater than or equal to 0.0001 and less than or equal to 0.05, and x is greater than or equal to 0.01 and less than or An electrochemical cell comprising said electrode and a stack of said electrochemical cells, a method for producing said electrode and said composition.

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.