115results about "Lanthanum oxide/hydroxides" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention discloses a method for preparing metal oxide nano powder by a molten salt quenching method. The method comprises the following steps: firstly, heating a reaction system to enable precursor salt to be in a molten state; adding metal source salt into a reaction system and reacting for a period of time; taking out a reaction system and quenching in liquid; cooling the product to room temperature, centrifugally cleaning, and thoroughly drying to obtain a metal oxide nano powder material; wherein the mass ratio of the precursor salt to the metal source salt is (100-0.5): 1. According to the method disclosed by the invention, the metal oxide nano powder with various morphologies and sizes can be prepared, and the morphologies and the sizes of the metal oxide nano powder can be regulated and controlled through the ratio of precursor salt to metal source salt, the ratio of quenching liquid, the reaction temperature and the reaction time. The prepared metal oxide nano powder is applied to the fields of energy and environment such as catalysis, energy storage, degradation, ion exchange, desulfurization and denitrification and the like, the production process is simple, convenient and feasible, complex special equipment is not needed, and industrial production is easy to realize.

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 present invention relates to the technical field of rare earth, and in particular to a device and method for preparing a nano rare earth oxide by means of cooperation of ultrasonic waves and microwaves. By using the device, a nano rare earth oxide is prepared by means of processes such as stirring, reacting, filtering, washing, drying, and burning. The "internal heating" of microwaves and "cavitation" of ultrasonic waves can effectively accelerate the reaction, shorten the reaction time, and speed up the reaction rate, so as to obtain nanomaterials with no agglomeration and uniform particle size; the heat effect of the ultrasonic waves provides enough energy for ions waiting for nucleation in a solution, so as to promote formation of crystal nucleuses; and the chemical effect of ultrasonic waves can effectively promote primary nucleation and secondary nucleation of crystals, and provides energy for ions which cannot be nucleated. Stirring is implemented by means of the "cavitation" and mechanical effect of ultrasonic waves, and the strength of stirring is far higher than that of common mechanical stirring, effectively hindering grain growth, and thus obtaining superfine powder having a small particle size, good dispersity and complete crystallization.

The invention relates to the technical field of methane oxidative coupling, and discloses lanthanum oxide with a methane oxidative coupling function and a preparation method and application thereof, the pore diameter of the lanthanum oxide is in bimodal distribution, the first most probable pore diameter is 20-50 angstroms, and the second most probable pore diameter is 50-1000 angstroms. The preparation method of lanthanum oxide comprises the steps that a solid material and alkali liquor are mixed to obtain a mixed material, then the mixed material is subjected to solid-liquid separation to obtain a solid-phase product, the solid-phase product is roasted, and the solid material comprises lanthanum salt. When the lanthanum oxide is used for the oxidative coupling reaction of methane, the selectivity of hydrocarbon with two or more carbon atoms can be remarkably improved.

The present invention generally relates to a lanthanum oxide (La2O3)-reduced graphene oxide (rGO) nanocomposite-based humidity sensor device designed for high-performance detection across a wide relative humidity range of 11-95%. The sensor comprises an interdigitated electrode (IDE) substrate featuring a plurality of electrodes patterned on an insulating base. A sensing layer composed of a nanocomposite of La2O3 and rGO in the ratio of (x)La2O3+(1−x)rGO, where x ranges from 0.1 to 0.3, is deposited on the IDE using a drop-casting method. The slurry used for deposition includes ethanol as a solvent, and the coated substrate is subjected to mild heating at 60° C. to 80° C. for 1 to 2 hours to enhance adhesion and uniformity. The IDEs, made of gold, silver, or their composition, are connected to external leads interfaced with a measurement unit that enables real-time monitoring and quantification of humidity changes in the surrounding environment.

The invention relates to a method for selectively recovering rare earth La and Ce in waste polishing powder and regenerating a CeO2-based catalyst by coupling mechanochemical deconstruction with aluminum salt leaching. The method is characterized by comprising the following steps: firstly, selectively and efficiently extracting the rare earth La in the waste polishing powder by adopting mechanochemical enhanced deconstruction with aluminum salt leaching; and then regenerating and preparing the CeO2-based catalyst with high activity by adopting a nitric acid leaching-P204 extraction-hydrothermal combined process, and using the CeO2-based catalyst for catalytic degradation of VOCs (Volatile Organic Compounds). Compared with an existing recovery process of rare earth in waste polishing powder, the method has the advantages that a green aluminum salt leaching reagent is used for replacing strong acid, the leaching efficiency of rare earth La reaches 95% or above, the leaching efficiency of rare earth Ce reaches 97% or above, and the separation factor of La and Ce exceeds 8.5 * 10 < 3 >; in addition, the rare earth Ce in the waste polishing powder is further upgraded and converted into a CeO2 catalyst with high activity, the CeO2 catalyst is used for efficient catalytic degradation of ethyl acetate, the catalytic degradation efficiency of ethyl acetate reaches up to 99% or above, and cyclic high-quality utilization of the waste polishing powder is achieved.

The invention provides a beneficiation-metallurgy combined comprehensive utilization process for dilute separation tailings, which comprises the following steps: carrying out ore grinding and flotation treatment on the dilute separation tailings to obtain fluorite rough concentrate and flotation tailings; magnetically roasting the mixed reducing agent and the flotation tailings, and magnetically separating to obtain magnetically separated rough concentrate and magnetically separated rough tailings; carrying out fine grinding and magnetic separation on the magnetic separation rough concentrate to obtain a magnetic separation iron concentrate product and magnetic separation concentrate tailings; the magnetic separation coarse tailings and the magnetic separation fine tailings are mixed, and then acid washing liquid and acid washing residues are obtained after acid washing and solid-liquid separation are conducted in sequence; and carrying out pressurized acid leaching, solid-liquid separation and extraction on the pickling residues to obtain scandium oxide and niobium oxide. By adopting the flotation-magnetizing roasting-magnetic separation-acid pickling-pressurized acid leaching combined process, the fluorite coarse ore, the iron ore concentrate, the rare earth leaching solution and the niobium-scandium leaching solution are obtained, the comprehensive utilization rate of the tailings is greatly increased, the discharge amount of the tailings is reduced, the acid consumption of tailings treatment is reduced, the environmental pressure is reduced, and the benefits of enterprises are improved.

The invention discloses a lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The positive electrode material comprises a main body material as well as a metal oxide coating layer and a carbon layer which sequentially coat the main body material from inside to outside, the general chemical formula of the main body material is Li < x > Na < 1-x > CoO2; and the crystal phase of the main body material is an O2 phase. The positive electrode material can be used for preparing a lithium ion battery, and is prepared by the following steps: S1, mixing and sintering a sodium source and a cobalt source to obtain a P2-phase precursor; s2, preparing O2-phase lithium cobalt oxide from the P2-phase precursor and a lithium source; and S3, mixing the O2-phase lithium cobalt oxide with organic metal salt, and sintering at low temperature. According to the method, O2-phase lithium cobalt oxide is coated in a low-temperature sintering mode, compared with an existing coating mode, the coating effect is good, and coating elements cannot be diffused into the main body material.

The present invention relates to a mixed oxide of titanium, niobium and lanthanum of formula (I): LiwTi1-xLaxNb2-yM1yO7-zM2z (I) in which: 0.03 ≤ x ≤ 0.08M1 and M2 are at least one element selected from the group consisting of V, Ta, Fe, Co, Ti, Bi, Sb, As, P, Cr, Mo, W, B, Na, Mg, Ca, Ba, Pb, Al, Zr, Si, Sr, K, Cs and Sn; 0 ≤ w ≤ 5, 0 ≤ y < 2 and 0 ≤ z ≤ 0.3. Figure for abstract: [Fig. 8]

The application discloses a kind of red mud gradient depth purification-rare earth-radioactivity synergistic target purification method, by " hierarchical pretreatment and microwave modification→three-stage gradient dealkalization→rare earth-radioactivity synergistic target purification→full quantization recycling" four-stage integrated process, realize red mud harmless and high-value utilization.The three-stage gradient dealkalization uses microwave-CO2-biological synergic system, after dealkalization pH≤8.0, Na2O content<1%;Rare earth-radioactivity purification is extracted by HDES and coupled with multi-ligand magnetic material system, light rare earth recovery rate≥95%, middle heavy / rare earth recovery rate≥90%, U / Th removal rate≥95%;Full quantization recycling realizes red mud total utilization rate≥98.5%, wastewater reuse rate≥95%, every ton of red mud fixed CO2≥0.2 tons.The application is suitable for various high-alkali, containing radioactive and rare earth red mud treatment, with environmental benefits and economic benefits.

The invention relates to a method for producing a gadolinium-doped cerium oxide powder comprising a cobalt oxide, the method comprising the following successive steps of: 1) preparing a wet product comprising a mixture of: - particles of gadolinium-doped cerium oxide; - water containing a cobalt complex; d) optionally, removing at least some of the water; e) calcining the product obtained in step d), or, in the absence of step d), the product obtained in step 1), in an oxygenated fluid, so as to obtain the powder.

The present invention discloses a lithium ion battery ternary positive electrode material, wherein the material is a LiNi x Co y Mn 1‑x‑y A new phase is introduced into the O2 ternary positive electrode material, wherein 0<x<1, 0<y<1; the new phase is a metal oxide, and the new phase is x Co y Mn 1‑x‑y The coherent growth of the lamellar phase in the O2 ternary cathode material. The coherent growth of the two phases in the present invention is achieved by regulating the ternary cathode material components and process parameters during the material synthesis process, thereby inducing a new phase that coexists with the lamellar phase within the bulk phase of the ternary cathode material particles. The coherent growth of the lamellar phase and the new phase within the bulk phase of the ternary cathode particles acts as a "pinning" force within the crystal, preventing crystal structure collapse caused by anisotropic volume changes during charge and discharge, thereby alleviating mechanical failure of the ternary cathode material during cycling.

The present invention relates to a composition comprising monodisperse spherical rare-earth oxide particles having an average particle size of about 20 nm to about 300 nm. The rare-earth oxide particles in this composition have a diameter D of a calculated particle size in nanometers, which can be determined by the following formula. JPEG2026509615000020.jpg16166 Here, SSA is m 2 BET specific surface area in units of / g, ρ is g / cm² 3 The density is per unit area, and the difference from the diameter of the observed particle size measured by SEM is less than approximately 25%. The rare earth particles may be Dy2O3, Ho2O3, La2O3, and Y2O3 particles. This composition has properties beneficial for ceramic and electronic applications. Furthermore, the present invention includes a manufacturing process for these particles and applications for these particles.

The invention relates to a self-stopping polishing composition and a method. A chemical mechanical polishing composition for polishing a substrate having a silica material, comprising, consisting of, or consisting essentially of: a liquid carrier; cubic ceria abrasive particles dispersed in the liquid carrier; a self-stopping agent; and a cationic polymer.

A composition includes monodispersed spherical rare earth oxide particles having an average particle size of from about 20 nm to about 300 nm. The rare earth oxide particles of this composition have a particle size diameter D calculated in nm of the following formula (I) wherein SSA is a BET specific surface area in m2 / g and rho is a density in g / cm3 which differs by less than about 25% from the particle size diameter observed by SEM. The rare earth particles may be Dy2O3, Ho2O3, Y2O3, and La2O3 particles. Such compositions have beneficial properties for ceramic and electronic applications. Methods for preparing these particles and uses of these particles are also included. (I)

The application provides a core-shell heterogeneous gradient structure anti-ionizing radiation powder and a preparation method and application thereof, and belongs to the field of radiation protection. The preparation method of the core-shell heterogeneous gradient structure anti-ionizing radiation powder comprises the following steps: adding a high-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a core layer; adding the core layer and a low-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a preliminary wrapped powder in which a low-atomic-number metal wraps a high-atomic-number metal core layer; adding the preliminary wrapped powder and a rare earth salt into deionized water, sequentially performing aging, washing, drying, primary calcination, secondary calcination, airflow pulverization and air rotation blowing to obtain the core-shell heterogeneous gradient structure anti-ionizing radiation powder. Through the synergy of the core-shell heterogeneous structure, high-atomic-number and low-atomic-number oxides and multiple rare earth elements, the shielding performance of the material is significantly improved.

The invention provides a nano rare earth oxide as well as a preparation process and application thereof, and relates to the technical field of nano materials. The nano rare earth oxide is prepared from the following raw materials: rare earth ions, chitosan-hexadecyl trimethyl ammonium bromide, tea saponin, nano cellulose and a hydroxyapatite nano rod; the rare earth ions are selected from at least one of cerium ions Ce < 3 + >, yttrium ions Y < 3 + >, samarium ions Sm < 3 + >, terbium ions Tb < 3 + >, lanthanum ions La < 3 + >, praseodymium ions Pr < 3 + > and neodymium ions Nd < 3 + >. The prepared nano rare earth oxide can be used as an independent antibacterial agent, can also be used as a functional filler to be compounded with a polymer, and has application potential in the fields of medical instrument coatings, food packaging and the like.

) The present invention relates to a method for producing a cobalt oxide-containing, gadolinium-doped cerium oxide powder, comprising the sequential steps of: 1) preparing a wet product comprising a mixture of gadolinium-doped cerium oxide particles and water containing a cobalt complex; d) optionally removing at least a portion of said water; e) calcining the product obtained in step d) or, in the absence of step d), the product obtained from step 1) in an oxygenated fluid to obtain said powder.

The invention relates to a photo-thermal composite phase-change material with a built-in electric field for driving heterogeneous interface electron transfer and a preparation method of the photo-thermal composite phase-change material. The preparation method comprises the following steps: adsorbing multi-element metal through a metal organic framework precursor, and performing high-temperature carbonization to construct a graphitized carbon encapsulated metal nanoparticle coupled metal oxide ternary heterogeneous interface structure carrier; a built-in electric field is induced to be generated at a heterogeneous interface by utilizing Fermi energy level difference between the metal nanoparticles and the metal oxide, and electrons are driven to be transferred between the metal nanoparticles and the metal oxide; rich oxygen vacancies in the metal oxide effectively capture electrons, and efficient and controllable photon-generated carrier separation and utilization are achieved; and a pi-pi conjugate network of graphitized carbon forms a continuous electron transmission channel, so that rapid conduction of heat is further guaranteed. The problems that a traditional composite phase change material is high in carrier recombination rate, single in photothermal conversion mechanism and insufficient in thermal management controllability are solved, and the composite phase change material has application potential in the fields of solar heat storage, industrial waste heat recovery, intelligent temperature control systems and the like.

This invention discloses a method for preparing needle-shaped lanthanum oxide and its applications, belonging to the field of nanomaterials technology. The method involves mixing a lanthanum salt solution with a urea solution and placing the mixture in a microwave-ultrasonic reaction apparatus. Microwave heating is used, followed by ultrasonic stimulation for a certain period to obtain a precursor material. The precursor material is then washed, dried, and calcined to obtain needle-shaped lanthanum oxide. The lanthanum oxide obtained by this invention is needle-shaped, uniform in particle size, and possesses a slit-mesoporous structure, exhibiting dispersion without agglomeration. The nanoneedles intertwine to form a three-dimensional network structure with a certain porosity, which not only increases the specific surface area of ​​the material but also provides more adsorption sites. The needle-shaped lanthanum oxide prepared using this method can efficiently remove fluoride and phosphorus from groundwater, broadening the applications of lanthanum and achieving low-cost removal of fluoride and phosphorus from groundwater.

The present disclosure discloses a method for preparing rare earth oxide by recycling ammonia and carbon, comprising the steps of: (1) heating raw materials containing a first rare earth carbonate and a first rare earth oxide with microwave and calcining at 500-1000° C. for 20-120 min to obtain a second rare earth oxide and carbon dioxide; (2) reacting carbon dioxide with a first ammonia water to obtain a precipitant; (3) reacting the precipitant with rare earth chloride to obtain a second rare earth carbonate and ammonium chloride wastewater. In the method, calcination time is short, rare earth recovery rate, utilization rate of ammonia and carbon resources are high. The present disclosure also provides a use of a rare earth oxide in shortening calcination time and / or increasing rare earth yield.

The invention relates to the technical field of waste recycling, in particular to a method for recycling lithium, lanthanum and cerium in rare earth waste residues through cooperation of microwave fluorine fixation and DES gradient leaching, and the method comprises the following steps: (1) microwave oxidizing roasting and fluorine fixation pretreatment are carried out, Na2O2 and Ca (OH) 2 are used as additives, Ce < 3 + > is oxidized into Ce < 4 + > at the temperature of 400 DEG C, and fluorine is cured; (2) carrying out gradient leaching by adopting a choline chloride / lactic acid eutectic solvent, and selectively leaching lithium and lanthanum step by step by regulating and controlling the pH value so as to realize ternary efficient separation of Li / La / Ce; (3) realizing metal separation and acid-base regeneration by using a nanofiltration and bipolar membrane electrodialysis coupled membrane method system, and constructing an HCl closed cycle; and (4) directionally synthesizing high-added-value products such as nano lithium iron phosphate, ultra-pure lanthanum oxide and a cerium-zirconium solid solution catalyst from the separated product. The method provided by the invention solves the problems of poor separation selectivity, heavy fluorine pollution, high energy consumption and low added value of products in the traditional process, and realizes green, low-carbon and high-value recovery of the rare earth waste residues.

A process for manufacturing a lanthanum oxycarbonate powder comprising the following steps: a step of grinding an initial powder comprising lanthanum hydroxide La(OH)3 in the presence of a control agent, said control agent comprising ethylene glycol and said grinding resulting in a paste and a subsequent step wherein said paste is subjected to a heating step allowing the oxidation of the La(OH)3 powder into a La2O2CO3 powder. Figure for abstract: no figure

The invention relates to high-dispersion nano rare earth oxide particles and a preparation method thereof, and belongs to the technical field of nano material preparation. The preparation method adopts a Uniform-ST technology and comprises the following steps: (1) adding a rare earth salt precursor and a dispersing agent A into a solvent A to obtain a rare earth salt precursor solution in a homogeneous state; (2) adding a precipitant and a dispersing agent B into a solvent B to obtain a precipitant solution in a homogeneous state; (3) respectively adding the homogeneous solution prepared in the step (1) and the homogeneous solution prepared in the step (2) into a reactor, heating to a certain temperature, controlling the feeding speed, and filtering and washing to obtain a nano rare earth oxide precursor material; and (4) drying and calcining the nano rare earth oxide precursor material obtained in the step (3) to obtain the high-dispersion nano rare earth oxide particles. The preparation method provided by the invention is simple in process, short in reaction time, high in efficiency, uniform in granularity, good in repeatability and easy to industrially popularize.

A composition based on zirconium oxides, cerium oxides, and at least one rare earth element other than cerium, having a cerium oxide content of at most 50% by mass, characterized in that, after calcination at 1000 °C for 6 hours, it exhibits a maximum reducibility temperature between 450 °C and 480 °C and a specific surface area between 55 m² 2 / g and 60 m 2 / g.

The present invention relates to a mixed oxide of titanium, niobium, and lanthanum of formula (I): LiwTi1-xLaxNb2-yM1yO7-zM2z (I) in which: 0.03 ≤ x ≤ 0.08; M1 and M2 are at least one element selected from the group consisting of V, Ta, Fe, Co, Ti, Bi, Sb, As, P, Cr, Mo, W, B, Na, Mg, Ca, Ba, Pb, Al, Zr, Si, Sr, K, Cs, and Sn; 0 ≤ w ≤ 5, 0 ≤ y < 2, and 0 ≤ z ≤ 0.3. Figure for abbreviation: [Fig. 8]

The invention discloses a preparation method of a rare earth hydroxide nanowire, and belongs to the technical field of composite materials, and the preparation method specifically comprises the following steps: firstly, dissolving rare earth salt in deionized water, slowly dripping a surfactant into the solution, and adding an ammonia water solution to adjust the pH value of a reaction system to be greater than 10 to obtain a reaction solution; and putting the reaction liquid into a hydrothermal reaction kettle, reacting for 12 hours at the temperature of 200 DEG C, and synthesizing a rare earth hydroxide nanowire product. The preparation method adopts a hydrothermal synthesis technology, is relatively simple and controllable, and avoids the use of high-cost and pollution-free reagents. The preparation method is simple, the reaction temperature is low, the yield of the nanowire reaches 70% or above, and the prepared lanthanum hydroxide nanowire is large in length-diameter ratio and good in dispersity.

Provided are a pure inorganic stimuli-responsive sol, a preparation method therefor, and a use thereof. The sol comprises an inorganic one-dimensional nanomaterial and a solution for dispersing the inorganic one-dimensional nanomaterial. The inorganic one-dimensional nanomaterial at least comprises a rare earth metal element, and the positive charge of the rare earth metal element causes the inorganic one-dimensional nanomaterials to repel each other to form the sol. The preparation method comprises: step (1). adding an inducer to a metal salt solution while stirring to form a uniform liquid; step (2). adding a liquid to a reaction kettle for reaction; and step (3). controlling the environmental hydroxyl concentration to obtain a sol product. Further provided is a method for the stimuli-responsive conversion of a pure inorganic stimuli-responsive sol into a gel, a method for the conversion of a pure inorganic stimuli-responsive gel into a pure inorganic stimuli-responsive sol, and a use thereof in sterilization, hemostasis, wound recovery, drug carriers, medical auxiliary materials, cosmetic materials, or sunscreen products. The method has low cost, can achieve the adjustment of the interaction between one-dimensional inorganic nanomaterials without the need to replace ligands, and has extremely high advantages in stimuli-responsive sol-gel conversion capacity.

The invention discloses a La-Fe bimetal organic framework derived heterojunction material anode and a preparation method and application thereof, and belongs to the technical field of phosphorus adsorption materials. The preparation method of the La-Fe bimetal organic framework derived heterojunction material comprises the following steps: (1) mixing ferric salt, lanthanum salt, terephthalic acid and an organic solvent, and carrying out solvothermal reaction to obtain a La-Fe bimetal organic framework precursor material; and (2) carrying out calcination derivation on the La-Fe bimetal organic framework precursor material in an inert atmosphere to obtain the La-Fe bimetal organic framework derived heterojunction material. The preparation method is simple and low in cost, and the prepared La-Fe bimetal organic framework derived heterojunction material anode has the advantages of being high in adsorption capacity, high in adsorption rate, high in selectivity, wide in pH application range and the like on phosphate.