7results about "Lanthanum oxide/hydroxides" patented technology

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.

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 application relates to a kind of rich in defective oxygen and noble metal nanoparticle modified radial transition group-rare earth metal oxide porous nanosheet cluster, preparation method and application.The preparation method of the nanosheet cluster includes the following steps: first, transition group-rare earth metal precursor is prepared using hydrothermal method, then by calcination, obtain the radial transition group-rare earth metal oxide porous nanosheet cluster rich in defective oxygen, finally, using photoreduction method, prepare the radial transition group-rare earth metal oxide porous nanosheet cluster rich in defective oxygen and noble metal nanoparticle modification.The nanosheet cluster is constructed heterojunction by transition group metal oxide and rare earth metal oxide, presents radial structure, surface is rich in hole, noble metal nanoparticle and defective oxygen, can be applied to gas sensing, electrochemical sensing, photoelectric sensing and biosensing field.

This invention relates to the field of nuclear fuel technology, providing a eutectic solvent for separating lanthanum-actinium metal compounds, its preparation method, and its application. The eutectic solvent comprises a hydrogen bond acceptor and a hydrogen bond donor in a molar ratio of 1:(3-4); the hydrogen bond acceptor is selected from betaine; the hydrogen bond donor is selected from malonic acid, citric acid, lactic acid, malic acid, levulinic acid, or glycolic acid; and the viscosity of the eutectic solvent for separating lanthanum-actinium metal compounds is 20-1300 mPa·s. By optimizing the combination and ratio of the above-mentioned hydrogen bond acceptor and hydrogen bond donor, this invention not only achieves selective dissolution of lanthanum-actinium metal oxides, but also exhibits good radiation stability and biodegradability, allowing for long-term stable storage at room temperature. Simultaneously, it demonstrates high separation efficiency under mild conditions, effectively solving the environmental risks and high energy consumption problems of nuclear fuel reprocessing technology.

The application discloses a method for reducing the content of chlorine in rare earth oxides and the use of an ammonium acetate solution, and the method comprises the following steps: 1) adding a rare earth chloride solution and ammonia water into a bottom liquid in parallel flow to react, so as to obtain a reaction suspension; wherein the bottom liquid is an ammonium acetate solution; 2) performing solid-liquid separation on the reaction suspension, and washing the solid with water, so as to obtain a rare earth oxide precursor. The content of chlorine in the rare earth oxide obtained by the method is low.

This invention provides a Pr6O 11 This invention relates to a core-shell structured ZrB2 / SiC composite powder, its preparation method and application, and a thermal protective coating, belonging to the field of anti-oxidation and corrosion-resistant coating technology. It also provides a Pr6O... 11 A core-shell structured ZrB2 / SiC composite powder, with ZrB2 / SiC powder as the core material and Pr6O as the outer shell. 11 The shell material is formed by coating rare earth Pr6O. 11 Modification of ZrB2 / SiC powder to form Pr6O 11 The core-shell structure can minimize the oxidation of ZrB2 / SiC powder during the spraying process, and also utilize Pr6O 11 The lower melting point allows for further filling of defects such as pores in the coating during the spraying process, improving the density of the coating and thus effectively enhancing the coating's ultra-high temperature oxidation and ablation resistance.

The application relates to a preparation method of a rare earth metal oxide / polymer electrolyte film for a solid-state lithium-sulfur battery, and relates to a preparation method of a polymer electrolyte film for improving the performance of a solid-state lithium-sulfur battery. The application mainly solves the safety risks brought by a liquid-state lithium-sulfur battery, the problems of easy dissolution of polysulfides in an electrolyte to cause a shuttle effect and the compatibility of lithium metal and an electrolyte. The method is as follows: one, preparation of a rare earth metal oxide; two, preparation of a rare earth metal oxide / polymer electrolyte precursor slurry; three, preparation of a rare earth metal oxide / polymer electrolyte film; and four, assembly of a solid-state lithium-sulfur battery. In the application, the rare earth metal oxide / polymer electrolyte film is used to obtain higher ionic conductivity, lithium ion migration and higher safety at room temperature, and practical production application is promoted. The application is applied to the field of lithium-sulfur batteries.