75 results about "NEODYMIUM OXIDE" patented technology

The invention relates to a high-gloss black decorative glass prepared from sludge incineration ash by an all-electric melting method. The high-gloss black decorative glass comprises the following raw material components in percentage by mass: 75-79% of fly ash, 5-7% of calcium carbonate, 9-10% of sodium carbonate, 5-6% of potassium alkali, 1-1.4% of boric acid, 0.03-0.04% of porous carbon, 0.06-0.08% of semi-coke powder, 0.16-0.22% of cobaltosic oxide, 0.1-0.2% of cerium dioxide, 0.04-0.06% of neodymium oxide, 0.5-0.7% of waste zircon brick powder and 0.03-0.05% of yttrium oxide. The dedusting ash is electrostatic dedusting ash collected by incineration of filtered sludge in a municipal sewage treatment plant, and belongs to hazardous waste; the porous carbon is rich in a hierarchical pore structure of sub-nano pores (0.5-1.0 nm). According to the method, a closed-loop production mode that waste is used for treating waste is constructed, high-added-value decorative materials are produced while energy consumption is reduced, and environmental protection investment is converted into economic benefits.

The invention belongs to the technical field of environmental barrier coatings, and particularly relates to an environmental barrier coating for an outer ring block of an engine and a preparation method of the environmental barrier coating. The environmental barrier coating sequentially comprises a silicon layer, a double-ytterbium silicate layer, a single-ytterbium silicate layer, a transition layer and an abradable layer from inside to outside, and each of the transition layer and the abradable layer comprises a mixed oxide containing aluminum oxide, lanthanum oxide, magnesium oxide and neodymium oxide. The mass ratio of aluminum oxide to lanthanum oxide to magnesium oxide to neodymium oxide in the transition layer is (50-70): (15-25): (10-15): (8-10), and the mass ratio of lanthanum oxide to magnesium oxide to neodymium oxide in the abradable layer is (40-60): (20-30): (15-20): (5-8). The environmental barrier coating has significantly improved abradability, corrosion resistance, life in high temperature service environments.

The present invention discloses a method for preparing a pore-adjustable and metal-loaded graphite felt flow battery electrode, comprising the following steps: (1) pretreatment and pore separation: mixing graphite felt with an alkaline solution, magnetically stirring, heating, cooling to room temperature, and re-treating to obtain a pore-separated material; (2) loading neodymium oxide: immersing the pore-separated material in a solution containing a neodymium salt and a polyamino acid, heating, cleaning, and drying to obtain a neodymium oxide-modified electrode material; (3) loading oxygen-deficient CoMnOx: applying a mixed slurry containing manganese and cobalt to an electrode sheet, heating, cleaning, and drying to obtain an oxygen-deficient CoMnOx-loaded electrode; and (4) electrodepositing the oxygen-deficient CoMnOx-loaded electrode to obtain a novel graphite felt electrode with bismuth deposition. The electrode product obtained by the method of the present invention has an energy efficiency of more than 85%, and the number of stable cycles at which the energy efficiency is maintained can exceed 1440 times.

The utility model relates to the technical field of praseodymium neodymium oxide processing, in particular to a firing mechanism for praseodymium neodymium oxide processing, which comprises a base, the upper end face of the base is fixedly connected with a heat insulation shell, a plurality of first firing cylinders and second firing cylinders which are distributed in a staggered manner are respectively arranged in the heat insulation shell, the three first firing cylinders rotate clockwise, and the three second firing cylinders rotate clockwise. The two second firing barrels rotate anticlockwise, praseodymium neodymium oxide is brought to the upper end of the interior of the first firing barrel through a plurality of baffles and then slips off from the baffles, the praseodymium neodymium oxide is scattered and falls into the second firing barrel on the left side, then the praseodymium neodymium oxide is scattered again through the baffles in the second firing barrel on the left side, the praseodymium neodymium oxide is evenly heated, and the praseodymium neodymium oxide is evenly fired. Meanwhile, the praseodymium-neodymium oxide is moved into the first firing barrel on the right side through mutual cooperation of the three first firing barrels and the two second firing barrels and then discharged through a discharging pipe, and then the praseodymium-neodymium oxide is continuously fired, so that the working efficiency is improved.

The invention belongs to the technical field of castable, and relates to a refractory castable and a preparation method thereof. The invention provides a refractory castable taking a rare earth compound as a base material. The refractory castable comprises a first composite refractory material, a second composite refractory material, a binding agent, a water reducing agent and water, the first composite refractory material is composed of a first refractory framework and a first auxiliary agent; the first fireproof framework comprises rare earth compound powder; the second composite refractory material is composed of a second refractory framework and a second auxiliary agent; the second fireproof framework comprises rare earth compound powder; the rare earth compound powder is selected from one or more of cerium oxide, lanthanum oxide, neodymium oxide and yttrium oxide; the stability and corrosion resistance of the high-temperature industrial equipment can be improved.

This application discloses a heterogeneous catalyst for the selective hydrogenation of nitrile rubber and its application. The heterogeneous catalyst, by weight percentage, consists of 1–10% noble metal particles and 90–99% support, wherein the support is alumina, cerium oxide, titanium dioxide, zirconium oxide, or neodymium oxide. The content of positively valence noble metal in the catalyst accounts for 20–80% of the total noble metal element content, and the noble metal is uniformly loaded on the support. The noble metal is Rh, Os, Ir, Pt, Ru, or Pd, and the particle size of the noble metal particles is 1–20 nm. The heterogeneous catalyst of this invention can carry out hydrogenation reactions at room temperature and pressure, and its hydrogenation selectivity is as high as 100%, with a hydrogenation activity >99%.

The invention relates to the field of solid waste resource recovery, in particular to a method for recovering iron, calcium and rare elements in red mud through cooperation of magnetic separation and oxalic acid. The method comprises the following steps: mixing red mud with a reducing agent, then carrying out reduction roasting at 600-900 DEG C, grinding the roasted clinker, then carrying out water leaching, carrying out solid-liquid separation, and washing; magnetic separation is conducted on the water leaching residues, and iron ore concentrate and non-magnetic residues are obtained; carrying out sulfuric acid leaching on the non-magnetic slag, filtering to remove impurities to obtain neodymium-rich leachate, treating the leaching residues with hydrochloric acid, and roasting to recover calcium; and oxalic acid is added into the neodymium-rich lixivium for precipitation, a neodymium oxalate product is obtained, and neodymium oxalate is roasted to obtain a neodymium oxide product. The method is simple in process and low in medicament consumption, and realizes efficient separation and comprehensive utilization of iron, calcium and rare elements.

The application discloses a kind of waste lithium battery positive electrode material recycling method, it is related to lithium battery positive electrode material technical field.The application is in preparation lithium battery positive electrode material, first waste lithium iron phosphate battery is discharged and disassembled, and in cold hot water circulation immersion separation current collector, after calcination, with sulfuric acid-hydrogen peroxide selection leaching lithium ion is recovered to obtain recycled lithium carbonate;Carbonate ternary precursor is prepared by coprecipitation method;Carbonate ternary precursor, recycled lithium carbonate, silicon monoxide, lithium fluoride, neodymium oxide are mixed and secondly calcined to obtain doped modified ternary positive electrode material;Lanthanum, aluminum and zinc are coated on the surface of doped modified ternary positive electrode material by potassium-sodium alloy reduction method to obtain coated modified ternary positive electrode material;Coated modified ternary positive electrode material is mixed with conductive agent and binder, and then coated on carbon-coated aluminum foil to obtain lithium battery positive electrode material.The lithium battery positive electrode material prepared by the application has high charge-discharge specific capacity, high cycle life and good rate performance.

The utility model provides a praseodymium neodymium oxide preparation stock solution firing device, which belongs to the technical field of praseodymium neodymium oxide preparation, and comprises a conveyor belt and a firing furnace, the front surface of the conveyor belt is fixedly connected with the firing furnace, the back surface of the firing furnace is connected with a baffle plate in an embedded manner, the top of the firing furnace is fixedly connected with a servo screw rod, and the servo screw rod is fixedly connected with a motor. The output end of the servo lead screw is fixedly connected with a transmission plate, and the inner side of the firing furnace is fixedly connected with an electric heating pipe. The ventilating fan, the water tank, the conveying pump and the output head are additionally arranged through the fixing frame, the ventilating fan conveys air to the outer surface of the container, the air flow speed of the surface of the container is increased, primary cooling is conducted on stock solution in the container, meanwhile, the conveying pump generates suction force on water in the water tank, and the water is conveyed into the output head; at the moment, the output head atomizes and conveys the water to the outer surface of the container, and further cooling of the stock solution and the container is completed.

The present invention relates to a method for preparing a transuranium nuclide glass solid body. The method for preparing a transuranium nuclide glass solid body of the present invention comprises the following steps: 1) mixing granite powder and boron oxide powder and calcining to obtain granite glass powder; 2) uniformly mixing cerium oxide and neodymium oxide to obtain cerium-neodymium oxide; 3) mixing the cerium-neodymium oxide with the granite glass powder as a base material, adding transuranium nuclides, adding a mixing medium and mixing uniformly, and then pressing and molding to obtain a molded body; 4) calcining the molded body at 1200°C-1400°C for 1-3 hours under an inert atmosphere to obtain a transuranium nuclide glass solid body. The preparation method of the present invention utilizes cerium-neodymium oxide in conjunction with granite glass powder to solidify transuranium nuclides under relatively mild conditions, thereby solving the problem of adhesion between the crucible and the solid body during solidification and sintering, and obtaining a transuranium nuclide glass solid body with good chemical stability.

The present invention relates to the technical field of wear-resistant materials, and more particularly to a nano-wear-resistant composite material, a preparation method thereof, and an application thereof. The composite material comprises the following raw materials in parts by weight: 45-50 parts of nano-tungsten carbide, 10-15 parts of cobalt powder, 7-11 parts of modified nano-titanium nitride, 5-7 parts of nano-neodymium oxide, and 4-6 parts of a synergistic agent doped with nano-TaC. The nano-wear-resistant composite material of the present invention utilizes nano-tungsten carbide in combination with cobalt powder and nano-neodymium oxide, and is further coordinated with the modified nano-titanium nitride and the synergistic agent doped with nano-TaC. Through the coordinated coordination and synergistic effect between the raw materials, the resulting nano-wear-resistant composite material achieves coordinated improvements in wear resistance, yield strength, and fatigue resistance. Furthermore, the product exhibits excellent performance stability under varying degrees of salt corrosion conditions.

The invention relates to a polycrystalline fused product of formula (Sc2O3)yAx(ZrO2 + HfO2)1-x-y, with 0.030 ≤ y ≤ 0.150, and 0.000 ≤ x ≤ 0.070, and x ≤ y, A denoting an additive selected from Y2O3, Al2O3, CeO2, Yb2O3, Gd2O3, MnO, Bi2O3, La2O3, Pr2O3, Nd2O5, Sm2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5 and mixtures thereof, ZrO2 + HfO2 + Sc2O3 + A representing more than 98% of the mass of the fused product, MnO expressing the total content of manganese oxides expressed in the form MnO, Pr2O3 expressing the total content of praseodymium oxides expressed in the form Pr2O3, Nd2O5 expressing the total content of neodymium oxides expressed in the form Nd2O5, Tb4O7 expressing the total content of terbium oxides expressed as Tb4O7, Ta2O5 expressing the total content of tantalum oxides expressed as Ta2O5, and Nb2O5 expressing the total content of niobium oxides expressed as Nb2O5.

The invention relates to the technical field of metallurgy, in particular to a rare earth neodymium iron boron waste recovery device and process. The rare earth neodymium iron boron waste recovery device comprises a metallurgical furnace and a feeding port formed in the metallurgical furnace, a flat hopper is arranged above the feeding port, a water shell is arranged behind the flat hopper, the front end of the water shell extends to form a shell, and the shell penetrates through the interior of the flat hopper; the front end face of the outer shell and the rear end face of the interior of the flat hopper are coplanar, a magnetic plate is embedded in the outer shell, the front end face of the magnetic plate and the front end face of the outer shell are coplanar, the upper end of the water shell is fixedly communicated with a water outlet pipe, the lower end of the water shell is fixedly communicated with a water inlet pipe, and a flow control swing part is arranged in the water shell in a penetrating mode. The proportion of neodymium-containing oxide in waste is guaranteed, stable reaction with a continuously and quantitatively fed reducing agent is guaranteed, the phenomenon of high-temperature demagnetization of the magnetic plate is avoided, and meanwhile crushed iron adsorbed on the magnetic plate can be automatically cleaned and discharged.

The invention discloses a method for recovering rare earth from neodymium iron boron waste through low-temperature chlorination and water leaching, which adopts the principle that rare earth elements and compounds thereof are easy to react with ammonium chloride at low temperature to form rare earth chloride ions, and iron and oxides thereof are not easy to chloridize, so that the rare earth is selectively chlorinated; the rare earth ions enter the water solution to complete separation of the rare earth and the iron. The main process comprises the following steps: firstly, carrying out chloridizing roasting reaction on ammonium chloride and rare earth in the neodymium iron boron waste material at a certain temperature; the method comprises the following steps: firstly, carrying out water leaching on rare earth chloride to obtain rare earth ions, finally, carrying out iron removal and oxalic acid precipitation on the leached rare earth ions, and then firing the precipitate to obtain mixed rare earth oxides such as neodymium oxide and praseodymium oxide.

Catalytic converter, comprehensive: a substrate with a cellular structure through which exhaust gas flows; and a catalyst layer formed on a cell wall surface of the substrate, wherein the catalyst layer comprises a lower catalyst layer and an upper catalyst layer, wherein the lower catalyst layer is formed on a surface of the substrate and the upper catalyst layer is formed on a surface of the lower catalyst layer. the upper catalyst layer includes: a zirconia compound support with rhodium supported thereon, wherein the zirconia compound support contains zirconia, lanthanum oxide and yttrium oxide, an aluminum oxide compound without rhodium carried on it, wherein the aluminum oxide compound contains aluminum oxide and lanthanum oxide, and a cerium oxide-zirconium oxide-based composite oxide containing cerium oxide, zirconium oxide, lanthanum oxide and neodymium oxide, and the lower catalyst layer includes: an aluminum oxide compound support with platinum supported thereon, wherein the aluminum oxide compound support contains aluminum oxide and lanthanum oxide, which are the same materials as those of the aluminum oxide compound of the upper catalyst layer, and a cerium oxide-zirconium oxide-based composite oxide without platinum supported thereon, wherein the cerium oxide-zirconium oxide-based composite oxide contains cerium oxide, zirconia, lanthanum oxide and neodymium oxide, which are the same materials as those of the cerium oxide-zirconium oxide-based composite oxide of the upper catalyst layer.

The application belongs to the technical field of high-entropy materials, and discloses a composite ceramic of Cr2O3-coated high-entropy pyrochlore and a preparation method and application thereof. 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Sc 0.2 )2Zr2O7, wherein x is 5-20 wt.%; the composite ceramic is prepared by the following steps: sintering lanthanum oxide, neodymium oxide, samarium oxide, gadolinium oxide and zirconium oxide at 1400-1700 DEG C to obtain high-entropy pyrochlore powder, stirring the high-entropy pyrochlore powder in a CrCl3 solution after ball milling, drying to obtain CrCl3-coated high-entropy pyrochlore powder, cold sintering the CrCl3-coated high-entropy pyrochlore powder at 200-400 DEG C and 200-500 MPa, then heat preservation at 800-900 DEG C, and then pressureless sintering at 1500-1700 DEG C. The composite ceramic has high density, excellent radiation resistance and leaching resistance, and can be applied in the field of nuclear waste solidification.

The application discloses a kind of low dielectric ultra-low loss high temperature stability neodymium oxide and zinc niobate co-doped barium titanate ceramic and preparation method.The general formula of the ceramic material is (1-x) BaTiO3-xZnNb2O6-xNd2O3, wherein x is 0.1-0.2, and is prepared by traditional solid-phase sintering method, with simple process, good repeatability and high yield.The application introduces Zn 2+ , Nb 5+ And Nd 3+ A / B site collaborative doping is carried out in BaTiO3 matrix, so that the obtained ceramic material realizes excellent comprehensive performance in the range of x=0.145-0.155 while maintaining moderate dielectric constant: extremely low dielectric loss (tanδ≤0.001), excellent temperature stability (ΔC / C 20°C ≤±0.5%, -150-250°C) and high breakdown field strength (E b ≥280kV / cm).The ceramic material is suitable for scenes with strict requirements on dielectric properties, temperature stability and breakdown field strength, and can be applied in fields such as aerospace extreme environment electronic components, new energy vehicle power modules and precision high-frequency sensing equipment, with significant application value and market potential.

The present invention relates to the technical field of environmentally friendly materials. The present invention provides an environmentally friendly stripping agent for NdFeB materials, a preparation method thereof, and a use method thereof. The stripping agent contains 1-5 weight percent of ammonium carbonate, 5-10 weight percent of sodium dihydrogen phosphate or trisodium phosphate, 1-5 weight percent of sodium hydroxide, 10-15 weight percent of potassium citrate, 5-10 weight percent of aminotriethanol, 15-20 weight percent of hexamethylenetetramine or ethylenediamine, 40-50 weight percent of deionized water, and 0.1-1 weight percent of A chelating agent and a surface repair agent; wherein the surface repair agent is a composition comprising 0.1-1 weight percent nanoparticles and 0.1-0.5 weight percent rare earth element compounds; the nanoparticles and the rare earth element compounds are used to form a complex for repairing tiny surface defects; the rare earth element compounds include dysprosium compounds, and one or more of praseodymium compounds and / or samarium compounds; the nanoparticles include nano-neodymium oxide and nano-iron oxide, and the mass ratio of nano-neodymium oxide to nano-iron oxide is 1:1-2:3.

The invention provides a rare earth oxide doped yttrium oxide stabilized zirconia ceramic material as well as a preparation method and application thereof, and belongs to the technical field of ceramic materials and industrial equipment protection. According to the preparation method, yttrium oxide stabilized zirconia is taken as a matrix phase, lanthanum oxide, cerium oxide, gadolinium oxide or neodymium oxide is taken as a doping phase, and the rare earth oxide doped yttrium oxide stabilized zirconia ceramic material is prepared through a solid-phase reaction and a spark plasma sintering technology. Through the microstructure and phase composition of rare earth element doped optimized yttrium oxide stabilized zirconium oxide, the cavitation erosion resistance and mechanical property of the material are remarkably improved, and the material is suitable for preparing fluid equipment runner components such as hydraulic pump impellers and valve elements.

The invention provides a method for recovering neodymium oxide by using a neodymium-iron-boron permanent magnet material in a waste motor, which comprises the following steps of: firstly, decomposing the neodymium-iron-boron permanent magnet material in the waste motor into a fine particle raw material through a combined process of pre-cleaning, roasting and demagnetizing, twice crushing and screening, so that the subsequent acid dissolution contact area can be increased, and the yield of neodymium oxide is increased; the subsequent acid dissolution difficulty is simplified, the acid consumption and the reaction time are reduced, and the acid consumption cost is reduced, so that the dissolution efficiency of rare earth elements (such as neodymium) is improved; meanwhile, according to the method, reverse extraction is conducted on the organic extraction liquid through a synergistic reverse extraction agent composed of oxalic acid and sulfuric acid, the sulfuric acid can help to wash the organic phase to be recycled, the oxalic acid can reversely extract the organic phase to directly form neodymium oxalate sediment, and therefore the leaching cost of the neodymium iron boron original material is reduced, and the recovery process is simplified; and the recovery efficiency of neodymium oxide is finally improved.

This application discloses a phosphorus pig iron stabilizer for aluminum electrolysis. The stabilizer has a core-shell structure, comprising an improver as the core, a desulfurizing agent as the first outer shell coated on the improver, and a carbonizing agent as the second outer shell coated on the first outer shell. The improver includes one or more of ferrosilicon, calcium silicon, lanthanum oxide, cerium oxide, yttrium oxide, praseodymium oxide, and neodymium oxide. The phosphorus pig iron stabilizer disclosed in this application can effectively solve the elemental imbalance problem during the reuse of phosphorus pig iron and improve various problems caused by elemental imbalance.

The invention is applicable to the field of preparation of rare earth ceramic pigments, and provides a preparation method of a rare earth ceramic pigment for building wall surfaces, which comprises the following steps: S1, weighing industrial neodymium oxide and aluminum oxide in equal proportion, adding water, mixing and grinding to obtain slurry A; s2, weighing yttrium oxide and aluminum hydroxide in equal proportion, adding water and chromium sesquioxide, and mixing and grinding to obtain slurry B; s3, mixing the slurry A obtained in the step S1 and the slurry B obtained in the step S2 to obtain slurry C; and S4, the slurry C is poured into a drying cylinder to be dried, a stirring mechanism is arranged in the drying cylinder to stir and heat the slurry C, and a spiral conveying mechanism in the drying cylinder drives the slurry C to be vertically conveyed. The problems that in a traditional drying process, due to the fact that the conveying speed is not matched with the heating uniformity, the drying efficiency is low, and materials are heated unevenly are solved.

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 application relates to a conductive paste special for an electrostatic chuck and a preparation method and application thereof, and the conductive paste is prepared by the following mass percentages: tungsten powder 80-85%, neodymium oxide 0.4-0.8%, aluminum oxide 1-1.5%, silicon dioxide 1-1.5%, an organic carrier 10-16% and a dispersing agent 1.5-2.8%. When the conductive paste is applied to an electrode layer in the electrostatic chuck by introducing neodymium oxide particles, the compactness of the electrode layer can be obviously improved, the square resistance is reduced, excellent conductive performance is exhibited, the electrostatic chuck has good electrostatic adsorption capacity, meanwhile, the silicon dioxide and the aluminum oxide are wetly penetrated into the inside of a ceramic base of the electrostatic chuck and form a mechanical interlocking structure with the ceramic, so that the bonding force between the electrode layer and the ceramic base is enhanced.

The invention discloses a samarium monatomic and strontium-doped neodymium oxide composite catalyst and a preparation method thereof, a nonylphenol electrochemical sensor and application thereof. The preparation method of the composite catalyst comprises the following steps: adding resorcinol, a formaldehyde solution and Sm (NO3) 3.6 H2O into an absolute ethyl alcohol-based colloidal suspension to carry out sol-gel treatment, and carrying out carbonization and etching to obtain Sm-SAC; the preparation method comprises the following steps: dropwise adding a first solution containing strontium hydroxide and neodymium nitrate hexahydrate into a second solution containing 1, 2, 3-triazole, trimesic acid and polyvinylpyrrolidone to prepare a Sr-Nd bimetallic precursor, annealing to obtain strontium-doped neodymium oxide, adding the Sm-SAC and the strontium-doped neodymium oxide into water, and carrying out ultrasonic dispersion, centrifugation, washing and drying to obtain the composite catalyst. The composite catalyst provided by the invention has strong adsorption capacity, efficient electrocatalytic oxidation activity, excellent anti-interference capability and structural stability, and the sensor has high recovery rate, low signal attenuation and excellent reusability.

The application relates to the technical field of extraction devices, and discloses a high-purity praseodymium neodymium oxide extraction device, which solves the problem that the stirring form of the current extractor is relatively single, the stirring is insufficient and uneven, the extraction effect is poor, and the extraction purity is affected, the device comprises an inverted L-shaped base, two fixed vertical plates are arranged on the inner side of the inverted L-shaped base, rotating shafts are rotatably arranged on the upper parts of the opposite sides of the two fixed vertical plates, a connecting sleeve ring is fixedly arranged between the end parts of the two rotating shafts, an extraction cylinder is arranged on the middle part of the connecting sleeve ring, a rotating cover is arranged on the top of the extraction cylinder, a first gear ring and a second gear ring are fixedly arranged on the surface of the extraction cylinder and the surface of the rotating cover respectively, a transmission assembly is arranged on one side of the connecting sleeve ring, and the upper part of the transmission assembly is in transmission connection with the first gear ring and the second gear ring; the high-purity praseodymium neodymium oxide extraction device has various stirring functions, can effectively ensure that the extraction stirring is sufficient and uniform, and can effectively improve the extraction effect and the purity.

The invention discloses a method for directly preparing neodymium iron boron powder from neodymium oxide and application, and the method comprises the following steps: S1, neodymium oxide, an iron source, a boron source and a carbon reducing agent are obtained, and the molar ratio of neodymium to iron to boron to carbon is 1: (13-15): 1: (2.8-3.5); s2, mixing the raw materials obtained in the step S1, and refining the raw materials until the granularity is 1-10 microns to obtain a mixture; s3, granulating or pre-pressing the mixture; and S4, putting the mixture treated in the step S3 into a high-temperature-resistant container, raising the temperature to 200-400 DEG C, preserving heat for 0.5-2 hours, raising the temperature to 1100-1400 DEG C, preserving heat for 0.5-6 hours, cooling and taking out. According to the technical scheme, the effects of remarkably reducing or avoiding dependence on strong-activity reducing agents such as Ca / CaH2 and the treatment cost of byproducts caused by dependence on strong-activity reducing agents such as Ca / CaH2 and improving the purity and the yield of the Nd2Fe14B phase are achieved.

The utility model discloses an extraction tank for praseodymium neodymium chloride production, and relates to the technical field of extraction tanks for praseodymium neodymium oxide production, the extraction tank comprises an extraction tank, the extraction tank consists of an extraction bottom tank and an extraction top tank which is arranged at the top of the extraction bottom tank and is communicated with the extraction bottom tank, and the inner diameter of the extraction top tank is half of the inner diameter of the extraction bottom tank; feed hoppers communicated with the extraction top tank are symmetrically arranged above the outer wall of the extraction top tank, and connecting covers are arranged on the feed hoppers; a sealing cover is arranged on the extraction top tank; a discharge pipe is arranged at the bottom of the extraction bottom tank, and a discharge valve is arranged on the discharge pipe; a cooling box is arranged at the bottom of the discharging pipe; a first stirring frame and a second stirring frame are arranged in the bottom of the extraction bottom tank; the first stirring frames are arranged around the second stirring frame in a circular array, and the number of the first stirring frames is not less than three; the first stirring frame comprises a first driving shaft and a first spiral blade; the stirring quality is improved, and the extraction powder making efficiency is improved.

The invention relates to an electrochemical device comprising and powder of a polycrystalline fused product of formula (Sc2O3)yAx(ZrO2 + HfO2)1-x-y, with 0.030 < y < 0.150, and 0.000 ≤ x ≤ 0.070, and x ≤ y, A denoting an additive selected from Y2O3, Al2O3, CeO2, Yb2O3, Gd2O3, MnO, Bi2O3, La2O3, Pr2O3, Nd2O5, Sm2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5 and mixtures thereof, ZrO2 + HfO2 + Sc2O3 + A representing more than 98% of the mass of the fused product, MnO expressing the total content of manganese oxides expressed in the form MnO, Pr2O3 expressing the total content of praseodymium oxides expressed in the form Pr2O3, Nd2O5 expressing the total content of neodymium oxides expressed in the form Nd2O5, Tb4O7 expressing the total content of terbium oxides expressed as Tb4O7, Ta2O5 expressing the total content of tantalum oxides expressed as Ta2O5, and Nb2O5 expressing the total content of niobium oxides expressed as Nb2O5.

The invention belongs to the technical field of preparation of high-temperature-resistant adhesives, and discloses a preparation method of a neodymium oxide modified aluminum phosphate-based high-temperature adhesive for aluminum nitride connection. Aiming at the problems of insufficient high temperature resistance, low bonding strength, high brittleness, poor thermal shock resistance and water resistance and the like of a pure aluminum phosphate adhesive, the comprehensive performance of the adhesive is improved through neodymium oxide doping modification and process optimization. The preparation method comprises the following steps: reacting neodymium oxide with dilute phosphoric acid to prepare adhesive cement, and adding silicon and boron carbide for modification to prepare the adhesive. The adhesive does not need high-temperature sintering, is primarily cured at normal temperature for 24 hours, can be used after being dried at 150 DEG C, and is suitable for industrial mass production. After high-temperature treatment at the temperature of 1300 DEG C, the bonding strength is not lower than 35 MPa and is far better than that of a pure aluminum phosphate adhesive; stable ceramic phase structures such as aluminum phosphate and neodymium phosphate are formed at high temperature, the interface compatibility is excellent, the thermal stability is outstanding, the problem of high-temperature bonding of aluminum nitride ceramic can be effectively solved, and the aluminum nitride ceramic can be widely applied to the fields of high-temperature structure connection such as aerospace and steel manufacturing.