16 results about "Lanthanum compounds" patented technology

The invention relates to the technical field of rare earth impurity removal, in particular to a composite fluorine removal agent and a fluorine reduction method of the composite fluorine removal agent in ionic rare earth concentrate, and the composite fluorine removal agent comprises the following components in percentage by weight: 15-25% of ferric salt, 20-35% of calcium salt, 20-30% of sodium salt, 15-20% of lanthanum compound and 15-20% of cerium compound. According to the method, the iron salt, the calcium salt, the sodium salt, the lanthanum compound and the cerium compound have a synergistic effect, so that the defluorination efficiency can be remarkably improved, the generation of three-phase substances in the subsequent extraction and separation process is reduced, efficient defluorination can be directly realized in an acid-soluble system, and the energy consumption and the production cost are reduced.

The invention relates to a method capable of inhibiting large arc ablation in a micro-arc oxidation process, which comprises the following steps: placing a to-be-treated workpiece in a micro-arc oxidation solution, and carrying out micro-arc oxidation treatment to finally obtain a product, the micro-arc oxidation solution comprises the following components: 10-40 g / L of sodium silicate, 2-5 g / L of potassium hydroxide and 0.2-0.6 g / L of a lanthanum compound, wherein the particle size of the lanthanum compound is 100-120 nm. The method has the effects that part film layer ablation is improved, and generation of abnormal large electric arcs is effectively restrained.

The invention discloses a sputtering target produced by powder metallurgy, the sputtering target containing 0.3-10 wt.% of an oxygen-containing lanthanum compound (La), the remainder being molybdenum (Mo) and unavoidable impurities, characterized in that the sputtering target has an Mo phase and an La phase, an average grain size of the Mo grains in the Mo phase being 1-200 µm, and the sputtering target having an isotropic microstructure.

The invention discloses a silicon steel finished product based on a porous carbon-based catalyst and a preparation method thereof.The method comprises the steps that a hydrothermal-inert atmosphere high-temperature calcination method is adopted, and metal and / or N-doped graphene aerogel with the BET specific surface area larger than or equal to 700 m / g and the pore diameter of 2-5 nm is prepared; pre-coating the surfaces of silicon particles with the metal and / or N-doped graphene aerogel through a spray drying method, and forming a porous carbon-based catalyst layer on the surfaces of the silicon particles to obtain coated silicon particles; mixing the coated silicon particles with iron powder to form mixed powder, and adding ethanol, a lanthanum-containing compound and a cerium-containing compound into the mixed powder for ball milling to obtain composite powder; and the composite powder is subjected to spark plasma sintering and post-treatment, and a finished silicon steel product is obtained. The compactness, the magnetic performance and the corrosion resistance of the silicon steel finished product material are improved.

The application discloses a Gd-doped lanthanum-manganese perovskite modified by coupling acid etching, a preparation method and application, and belongs to the technical field of volatile organic compound purification, and comprises the following steps: dissolving a lanthanum-containing compound, a gadolinium-containing compound and a manganese nitrate solution in water, and performing ultrasonic treatment to obtain a precursor mixed solution; adding oxalic acid to the precursor mixed solution, stirring until the oxalic acid is dissolved, and then performing a heating reaction, performing suction filtration, and drying until the weight is constant to obtain a solid substance; performing high-temperature calcination on the solid substance, placing a product obtained in a nitric acid solution to perform acid etching treatment, and after being taken out, performing rinsing and drying to obtain the Gd-doped lanthanum-manganese perovskite modified by coupling acid etching. The catalyst presents excellent low-temperature catalytic oxidation removal VOCs performance, and provides a high-performance and low-cost catalyst solution for industrial VOCs treatment.

Provided is a raw material for forming a thin film, which contains a lanthanum compound represented by general formula (1). In general formula (1), R1, R3, R4, R6, R7, and R9 each independently represent an aliphatic hydrocarbon group having 1 to 8 carbon atoms or a heteroatom-containing hydrocarbon group having 1 to 8 carbon atoms, and R2, R5, and R8 each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. However, R1 and R3 and R4 and R6 and R7 and R9 are all the same groups as each other, and R2, R5 and R8 are all the same groups.

The invention discloses ternary inorganic sulfide lanthanum bismuth sulfide and a powder preparation method thereof, the chemical formula of the lanthanum bismuth sulfide is BiLa8S12, and the lanthanum bismuth sulfide has wide-spectrum optical transmission performance and high-melting-point performance. The preparation method of the sulfur lanthanum bismuth powder comprises the following steps: preparing a bismuth halide additive or a bismuth sulfide additive by taking lanthanum compound alpha-La2S3 or lanthanum polysulfide LaS2 powder as a raw material, and mixing the raw material and the additive to prepare a precursor of the sulfur lanthanum bismuth powder; and putting the prepared precursor mixture powder into an improved ball milling tank, carrying out mechanochemical reaction in a protective gas environment, and separating out the powder after ball milling is finished, so as to obtain the BiLa8S12 powder. Compared with other lanthanum sulfide-based compounds, the BiLa8S12 compound provided by the invention has obviously higher thermodynamic stability and oxidation resistance.

The invention discloses a broadband near-infrared stress luminescent material without pre-irradiation as well as a preparation method and application of the broadband near-infrared stress luminescent material. The material is La < 3 > Ga < 5-5x > GeO < 14: 5x > Cr < 3 + >, wherein x is greater than or equal to 0.0025 and less than or equal to 0.02; the crystal structure belongs to a P321 trigonal system structure, and the active ion is Cr < 3 + >. The preparation method comprises the following steps: respectively weighing a lanthanum-containing compound raw material, a gallium-containing compound raw material, a germanium-containing compound raw material and a chromium-containing compound raw material, uniformly grinding the raw materials, grinding, pre-sintering, calcining, cooling to room temperature along with a furnace, and grinding to obtain the near-infrared stress luminescent material without pre-irradiation. The material disclosed by the invention shows broadband emission in a near-infrared 1 region range, and has good self-energy-supply performance, the stress luminescence intensity can be self-recovered, and the stress luminescence intensity can be kept at a considerable level even if force circulation times are continuously applied for multiple times. The material can be used for preparing a stress luminescent film suitable for biological physiological parameter detection.

The invention provides an anti-fatigue tungsten-based composite material for a robot and a preparation method of the anti-fatigue tungsten-based composite material, and relates to the technical field of metal materials. The composite material is composed of a tungsten-lanthanum alloy core layer, a polyurethane-silicone copolymer coating and a nanoscale surface treatment layer. The lanthanum content in the tungsten-lanthanum alloy core layer is 0.25-0.85 weight percent, the thickness of the polymer coating is 5-20 microns, and the outer surface roughness Ra is less than or equal to 0.1 micron. The preparation method comprises the following steps: performing cold isostatic pressing and sintering on tungsten powder and a lanthanum compound to prepare a bar; multi-pass hot drawing is carried out, and annealing is carried out when the area reduction rate is 40%-60%; continuously drawing until the target wire diameter is 0.02 to 0.07 mm; coating a polymer solution and curing; and finally performing electrochemical polishing to form a super-smooth surface. The tensile strength of the product reaches 5500-6500 MPa, the creep rate is smaller than 0.5% after 500,000 times of stretching cycles, the product can last for more than 8 hours in a 80kg load test, and the product is particularly suitable for a high-precision robot tendon rope transmission system.

The invention provides a crystallization defluorination method for fluorine-containing wastewater in the presence of high-concentration sulfate radicals, and belongs to the technical field of water treatment.The crystallization defluorination method comprises the following steps that before defluorination is conducted on fluorine-containing water containing the high-concentration sulfate radicals, lanthanum fluoride crystal seeds, a composite regulator and a defluorination agent lanthanum hydroxide are added into the water, crystallization reaction conditions are controlled, and the fluorine-containing water containing the high-concentration sulfate radicals is obtained. Enabling fluorine ions and lanthanum hydroxide to form a stable fluorine lanthanum compound crystal through directional crystallization; fluorine lanthanum compound crystals are removed through solid-liquid separation, and deep fluorine removal of the water body is achieved. According to the present invention, with the lanthanum hydroxide crystallization method, by using the extremely low solubility product of the fluorine lanthanum compound, the efficient fixation of the fluorine ions can still be achieved under the interference of the high-concentration sulfate radical, the fluorine concentration of the treated water body is stably reduced to less than 10 mg / L, the secondary pollution is avoided, and the defects of poor selectivity and easy saturation in the high sulfate radical environment of the traditional adsorption method are overcome; the method is suitable for treating high-salt fluorine-containing water bodies such as mining area wastewater and metallurgical fluorine-containing wastewater.

The invention discloses Gd-doped coupled acid-etched modified lanthanum-manganese perovskite and a preparation method and application thereof, and belongs to the technical field of volatile organic compound purification, and the preparation method comprises the following steps: dissolving a lanthanum-containing compound, a gadolinium-containing compound and a manganous nitrate solution in water, and carrying out ultrasonic treatment to obtain a precursor mixed solution; adding oxalic acid into the precursor mixed solution, stirring until the oxalic acid is dissolved, carrying out heating reaction, carrying out suction filtration, and drying until the weight is constant to obtain a solid; and roasting the solid at a high temperature, placing the obtained product in a nitric acid solution for acid etching treatment, taking out the product, rinsing, and drying to obtain the Gd-doped coupling acid etching modified lanthanum manganese perovskite. The catalyst shows excellent low-temperature catalytic oxidation VOCs removal performance, and a high-performance and low-cost catalyst solution is provided for industrial VOCs treatment.

The application provides a modified biochar-based slow-release rare earth lanthanum soil conditioner and a preparation method thereof, and relates to the technical field of soil conditioners.The saline-alkali soil conditioner is used for reducing soil salinity, fixing heavy metals in soil, improving soil structure and slowly releasing rare earth elements into soil.The preparation method comprises the following steps: step 1, preparing a rare earth lanthanum compound, modified biochar, phosphate, dehydrated river channel silt and an organic complexing agent;step 2, dissolving the rare earth lanthanum compound and the organic complexing agent in deionized water to generate a complex solution through reaction;step 3, preparing modified biochar;step 4, lanthanum loading;and step 5, mixing the matrix to obtain the saline-alkali soil conditioner.Lanthanum nitrate and sodium citrate are converted into a complex solution in the application, and the lanthanum citrate complex has good stability, can effectively fix lanthanum elements in the form of a complex in the solution, avoids precipitation or loss of lanthanum elements in the subsequent treatment process, and realizes the slow-release effect of lanthanum.

This invention relates to the field of water electrolysis catalyst technology, and particularly to a lanthanum-sulfur co-doped nickel foam-based water electrolysis catalyst, its preparation method, and its application. The method includes: firstly, pre-treating the nickel foam with multi-step ultrasonic cleaning to remove the surface oxide layer and impurities; then, dispersing a lanthanum-containing compound and a sulfur-containing compound in deionized water to prepare a uniform precursor solution; finally, immersing the pre-treated nickel foam in the precursor solution, followed by hydrothermal reaction and alternating cleaning and vacuum drying, to obtain both supported and powdered forms of the lanthanum-sulfur co-doped nickel foam-based water electrolysis catalyst (LaS@NF). The catalyst prepared by this invention exhibits excellent catalytic performance in the field of hydrogen production through water electrolysis, with the optimal sample showing a HER Tafel slope as low as 88.09 mV dec. ‑1 The OER Tafel slope is as low as 64.22 mV dec ‑1 The current density can reach 4500 mA cm⁻¹ ‑2 The catalytic activity is significantly superior to that of conventional non-noble metal catalysts. This invention also possesses excellent structural stability and conductivity, and the preparation process is simple.

Described herein are compositions comprising a lanthanum compound and methods of treating cancer with the composition.

This invention belongs to the field of luminescent materials technology, and discloses a europium-doped tungstate red fluorescent material, its preparation, and its application. The chemical formula of the fluorescent material is: Ca2La 18‑x W8O 53 :xEu 3+ 0.10≤x≤0.50. The preparation method includes the following steps: Raw materials are weighed according to their chemical formulas and stoichiometric ratios: calcium-containing compounds, lanthanum-containing compounds, tungsten-containing compounds, and europium-containing compounds; the weighed raw materials are thoroughly ground and then placed in a muffle furnace for high-temperature calcination in air to obtain the desired red fluorescent material. Under ultraviolet or blue light excitation, the phosphor emits bright red light. This fluorescent material has high chromatic purity, low correlated color temperature, and high emission intensity. The preparation process is a one-step synthesis method, which is simple, pollution-free, energy-saving, and environmentally friendly, enabling large-scale industrial production.

This invention relates to a low thermal expansion and high thermal shock barium zirconate composite ceramic and its preparation method. The technical solution is as follows: Barium zirconate powder and ethanol are ground and dried to obtain barium zirconate powder; the barium zirconate powder is mixed with a lanthanum compound, ball-milled, and the ball-milled mixture is dried and granulated, machine-pressed, and then isostatically pressed to obtain a ceramic green body; the isostatic pressing process involves five pressure increases: the pressures of the five pressure increases are 25–35 MPa, 40–70 MPa, 80–100 MPa, 110–130 MPa, 140–200 MPa, and 140–200 MPa, respectively, and the pressure is maintained at 140–200 MPa; the ceramic green body is heated at different rates to 980–1020℃, 1290–1310℃, 1490–1510℃, and 1550–1650℃, respectively, and held at 1550–1650℃ for 1–6 hours to obtain a low-expansion, high-thermal-shock barium zirconate composite ceramic. The present invention features low sintering temperature and low carbon emissions, and the resulting products have low bulk density, high apparent porosity, low coefficient of thermal expansion, and good thermal shock resistance.