303 results about "Praseodymium" patented technology

The invention belongs to the technical field of catalysts, and relates to a surface-reconstructed heterojunction catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt salt, ferric salt and praseodymium salt in deionized water, heating and spraying on a carrier to prepare praseodymium-doped ferrocobalt layered double hydroxide; mixing the praseodymium-doped ferrocobalt layered double hydroxide with a phosphorus source, and calcining in an inert atmosphere to prepare praseodymium-doped CoP / Fe2P; and carrying out electrooxidation treatment on the praseodymium doped CoP / Fe2P, so as to prepare the Pr6O11 cluster modified CoFeOOH heterojunction catalyst. Through cooperation of three technologies of spray thermal deposition, phosphating and electrooxidation, stable construction and electrochemical activation of a heterogeneous interface are realized, the corrosion resistance and chlorine evolution resistance competitive capacity of the catalyst in a chlorine-containing alkaline system are remarkably improved, the current density of 100 mA. Cm <-2 > can be achieved only through 223 mV overpotential, and meanwhile, stable operation is performed for 500 h.

The present application provides an entropy-regulated composite dielectric film, which comprises a polymer matrix; and fillers dispersed in the polymer matrix, wherein the fillers comprise Bi 4‑a M 1a Ti (3‑3b) M 2b O 12 , wherein M1 comprises at least one of lanthanum, neodymium, samarium and praseodymium, M2 comprises at least one of zirconium, hafnium and tin, 0 The entropy-regulated composite dielectric film has high temperature resistance, high breakdown strength, high polarization strength, high energy storage density and good stability.

The invention relates to the technical field of lithium ion batteries, in particular to a diaphragm material for a lithium battery and a preparation method of the diaphragm material. Comprising a base film and a modified nano TiO2 coating, the modified nano TiO2 coating is arranged on at least one side surface of the base film, and the modified nano TiO2 coating comprises the following raw materials in parts by weight: 55-80 parts of a modified nano TiO2 composite material, 8-24 parts of a binder and 2.5-7.5 parts of a dispersant; the modified nano TiO2 composite material is prepared by taking cellulose nanocrystals, lanthanum zirconate and rare earth praseodymium as modifiers and nano TiO2 as a raw material, the mass ratio of the cellulose nanocrystal to the lanthanum zirconate to the rare earth praseodymium is (1-5): (2-3): 1. By adding the modified nano TiO2 composite material and introducing nano particles into the diaphragm, a three-dimensional network structure is formed, the liquid absorption property and the ionic conductivity of the diaphragm are improved, and meanwhile, the diaphragm is high in air permeability and relatively good in mechanical property and ionic conductivity.

The invention relates to a PVB (polyvinyl butyral) composite film as well as a preparation method and application thereof. The PVB composite film is prepared from the following raw materials in parts by weight: 100 parts of PVB resin, 1-10 parts of nano praseodymium oxide, 1-10 parts of a dispersing agent, 0.01-1 part of a coupling agent and 20-50 parts of a plasticizer. The nano praseodymium oxide is added into the PVB resin, and the infrared absorption band of the PVB composite film is optimized by utilizing the infrared absorption performance, chemical stability and heat-resistant stability of the nano praseodymium oxide, so that infrared radiation can be efficiently blocked, and the excellent heat insulation effect and long-term use stability of the PVB composite film are realized. Furthermore, the nano praseodymium oxide is modified by a coupling agent, so that the dispersion uniformity of the nano praseodymium oxide in the PVB resin and the interface bonding force of the nano praseodymium oxide and the PVB resin are improved, the light transmittance loss of the PVB composite film is reduced, and the mechanical property and the heat insulation property of the composite film are improved.

The invention relates to the technical field of rare earth electrolytic metallurgy, and discloses a praseodymium-neodymium alloy low-temperature electrolysis cell voltage optimization method and system.The method comprises the steps that multi-parameter coupling analysis is conducted on an electrolytic cell low-temperature electrolysis initial parameter set, and key influence factors are obtained; carrying out correlation analysis on the key influence factors by combining fluctuation characteristics of the cell voltage to obtain an influence weight sequence; determining a collaborative adjustment scheme of the polar distance and the current density according to the weight sequence; the cell voltage is synchronously adjusted based on the collaborative adjustment scheme, and accurate control over the two is achieved; the operation parameters of the electrolytic cell are collected and integrated to obtain a feedback parameter set, the feedback parameter set is fed back to a correlation analysis link to optimize the key influence factor identification precision, and finally a cell voltage optimization scheme is obtained. The technology can accurately identify the key influence factors, dynamically adapt to the operation change of the electrolytic cell, improve the stability of the cell voltage, reduce energy consumption and cost, and improve the efficiency of cell voltage optimization. The production efficiency and the product quality are ensured.

The invention discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof.The porous chlorine dioxide slow-release preservative paper comprises a paper base, a porous carrier is fixed to the paper base through oxidized starch glue, and sodium chlorite, an activating agent and a stabilizing agent are loaded on the porous carrier; the porous carrier is one of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide with a porous structure. The slow release of chlorine dioxide can be stably and effectively realized, the release period of chlorine dioxide is prolonged, and long-acting stable sterilization and disinfection effects are realized.

The invention discloses a neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and a preparation method thereof, and relates to the technical field of neodymium-iron-boron magnet preparation, and the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet comprises the following preparation raw materials: 170-175 kg of PrNd (praseodymium-neodymium alloy), 25-30 kg of BFe (iron white copper), 1-5 kg of Co (cobalt), 0.1-2 kg of Cu (copper), 1-5 kg of Zr (zirconium), 0.1-1 kg of Ga (gallium) and 380-420 kg of Fe (iron). According to the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and the preparation method thereof, the 54H sintered neodymium-iron-boron magnet is prepared through a double-alloy technology with neodymium, iron and gallium as auxiliary alloy without adding dysprosium, terbium and other scarce type heavy rare earth elements, and performance optimization and cost optimization of the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet are achieved.

The invention discloses a cerium-zirconium-based high-entropy oxide as well as a preparation method and application thereof. According to the cerium-zirconium-based high-entropy oxide, cerium and zirconium serve as main bodies, and meanwhile rare earth elements (lanthanum, praseodymium, neodymium and samarium) and transition metal elements (manganese, iron, cobalt, nickel, copper and zinc) are introduced to form a high-entropy solid solution with the equal molar ratio and containing 3-8 kinds of metal. In the cerium-zirconium-based high-entropy oxide, the cerium element and the zirconium element respectively account for 20%-40% of the total amount, and the other elements are respectively 10%-30% in an equimolar ratio. The cerium-zirconium-based high-entropy oxide catalyst prepared by the invention has excellent oxygen storage and release capacity and CO oxidation capacity, and the CO complete conversion temperature is 181 DEG C. The method adopts a simple coprecipitation process, is mild in condition and low in cost, and is suitable for large-scale application in the field of tail gas purification.

The invention relates to the technical field of neodymium-iron-boron magnet production, in particular to a sintered neodymium-iron-boron magnet for preparing lanthanum-cerium-yttrium and a method of the sintered neodymium-iron-boron magnet. In the invention, the cerium element is used for replacing a praseodymium-neodymium alloy, meanwhile, the lanthanum and yttrium elements are introduced according to the proportion to generate a synergistic effect to regulate and control the structure of the high-cerium-content sintered neodymium-iron-boron magnet, the yttrium element is used for inhibiting main phase grain coarsening and improving the coercive force, and the lanthanum and yttrium elements can promote the flow of a rare earth-rich liquid phase in the sintering process and improve the diffusivity, so that the high-cerium-content sintered neodymium-iron-boron magnet is obtained. The density is improved.

The invention discloses a rare earth metal electrolytic reduction method based on a high-frequency switching power supply, and relates to the technical field of rare earth metal electrolytic reduction, and the method comprises the following steps: firstly, in a praseodymium-neodymium electro-deposition process, parameter data in the praseodymium-neodymium electro-deposition process is accurately obtained in real time by using an advanced sensor and detection equipment; and accurate, comprehensive and real-time data support is provided for subsequent intelligent analysis. According to the invention, the problems of stress accumulation, crack propagation and coating stripping caused by fixed preset intermittent closing time in high-current density electrodeposition are solved. Intelligent optimization is realized through real-time data acquisition, deep learning evaluation and dynamic pulse current regulation and control. And when the stress rise is detected, the system adaptively prolongs the intermittent closing time, and reduces the pulse peak current, so that the deposition rate is optimized, and the uniformity and compactness of a plating layer are improved. The method improves the mechanical strength and corrosion resistance of the coating, prolongs the service life of equipment, reduces the energy consumption, and improves the process stability and consistency.

The invention relates to the technical field of fuel cell new materials and new energy, in particular to an A-site high-entropy perovskite cathode material and a preparation method thereof. According to the technical scheme, the material comprises the following raw materials: Pr (NO3) 3.6 H2O, La (NO3) 3.6 H2O, Co (NO3) 2.6 H2O, CaCO3, BaCO3, SrCO3 and citric acid. The molar ratio of the praseodymium ions to the lanthanum ions to the cobalt ions to the calcium ions to the barium ions to the strontium ions to the citric acid is 1: (1-2). According to the invention, the A site of the perovskite material is doped with a plurality of elements, a rapid quenching preparation process is combined, the oxygen vacancy concentration and the proton conduction path can be optimized, the ORR activity and the conductivity can be improved, and excellent electrochemical performance and thermal stability can be shown through the synergistic effect of the plurality of elements and structural regulation and control, so that the performance of the cell can be improved.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the hexagonal cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 3.5-6, and carrying out sol-gel reaction to obtain hexagonal cerium dioxide sol; and (3) carrying out post-treatment on the hexagonal cerium dioxide sol to obtain the hexagonal cerium dioxide. According to the preparation method of the hexagonal cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the hexagonal cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet without heavy rare earth, Pr-Fe-B-M alloy is used as an auxiliary phase alloy, LRe-Fe-B-M alloy is used as a main phase alloy, the auxiliary phase alloy is used for preparing a magnet matrix and performing grain boundary diffusion at the same time, the magnet without heavy rare earth is prepared, praseodymium element is non-uniformly distributed in the magnet, and rare earth element is not uniformly distributed in the magnet. The Pr content of part of the main phase is higher than the overall average content, the crystal boundary praseodymium content is higher than the overall average content, and the magnet surface praseodymium content is higher than the overall average content. The coercive force and the temperature stability of the magnet are improved, the magnet can still keep excellent magnetic performance under the condition that Dy and Tb are not contained, heavy rare earth elements such as Dy and Tb which are scarce in resource and high in price are prevented from being used, the high performance of the magnet is guaranteed, the production cost is reduced, and the resource utilization efficiency is improved.

The application discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof. The paper comprises a paper base, a porous carrier is fixed on the paper base through oxidized starch glue, sodium chlorite, an activator and a stabilizer are loaded on the porous carrier, and the porous carrier is one of porous structures of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide. The application can stably and effectively realize slow release of chlorine dioxide, prolong the release period of chlorine dioxide, and realize long-acting and stable sterilization and disinfection.

The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a multi-component rare earth alloy diffusion source for improving the coercive force of a high-abundance neodymium-cerium-iron-boron magnet. The invention discloses a multi-component rare earth alloy diffusion source for improving the coercive force of a high-abundance neodymium-cerium-iron-boron magnet. The multi-component rare earth alloy diffusion source comprises rare earth elements and non-rare earth elements, the rare earth element is one or two of praseodymium element and holmium element; the non-rare earth element is a combination of an aluminum element and a copper element; the mass percent of rare earth elements in the multi-component rare earth alloy diffusion source is 80-95%, and the mass percent of non-rare earth elements in the multi-component rare earth alloy diffusion source is 5-20%. The invention further discloses a method for improving the coercive force of the high-abundance neodymium-cerium-iron-boron magnet and the prepared high-performance high-abundance neodymium-cerium-iron-boron magnet. The low-cost heavy rare earth element Ho is adopted as a diffusion source component, a Ho-rich (RE, Ho) 2Fe14B phase with a high magnetocrystalline anisotropy field is formed on the surface layer of main phase crystal grains, and the coercive force of the high-abundance neodymium-cerium-iron-boron magnet is improved.

The invention relates to the technical field of functional composite color-changing materials, in particular to a dynamic color-changing flexible composite material and a preparation method and application thereof. The flexible composite material is prepared from the following raw materials: photochromic powder, a flexible film matrix, low-viscosity silicone oil and a curing agent, the chemical general formula of the photochromic powder is (Li < 0.1 > Na < 0.4 > Bi < 0.5 >) < 0.95-x > Bi < 2 > Pr < x > Y < 0.05 > Nb < 2 > O < 9 >, wherein x ranges from 0.001 to 0.05. According to the flexible composite material provided by the invention, inorganic photochromic powder doped with rare earth elements is introduced into a PDMS / low-viscosity silicone oil elastomer matrix, and the composite ratio of the photochromic powder to the flexible film matrix and the doping content of rare earth ions praseodymium in the photochromic powder are regulated and controlled; the real-time, accurate and reversible regulation and control of the optical characteristic color of the material are realized by virtue of photostimulation, and a brand new thought is provided for preparing an optical stealth material.

The present application relates to a kind of spheroidal doped ceria and its preparation method and application, the preparation method includes the following steps: after cerium salt, doped metal salt, solvent, acidic reagent and precipitant are mixed, hydrothermal reaction is carried out, and the precipitate is obtained, the precipitate is calcined, and the spheroidal doped ceria of the present application is obtained;The doped metal salt includes praseodymium salt and / or neodymium salt.The present application uses cerium salt and praseodymium salt and / or neodymium salt as doped metal salt as raw material, by the design of mixing process and reaction procedure and the selection of preparation process, the preparation of spheroidal doped ceria is realized, the doped ceria of nanometer level particle is obtained, and its appearance is regular and particle size is uniform, and, the preparation method used in the present application is simple, reaction time is short, and can be used for mass production.

The present application relates to the technical field of extracting rare earth, and particularly relates to an extraction rare earth separation process method. Fluorine-carbon cerium ore crude ore is treated to obtain activated ore powder. The activated ore powder is subjected to alkali pressure boiling oxidation, roasting transformation and optimal dissolution leaching to obtain a purified liquid. The purified liquid is then subjected to barium chloride sulfuric acid removal, lead removal by sulfurized lead, pH adjustment and the like to obtain a low-impurity chlorinated rare earth liquid. The chlorinated rare earth liquid is subjected to multi-stage extraction to obtain a neodymium chloride solution, a praseodymium-neodymium chloride solution and a lanthanum-cerium chloride solution. The solutions are subjected to oxalic acid precipitation and calcination to obtain a rare earth oxide product. The present application adopts fine pretreatment, multi-stage differential extraction and purification processes to achieve efficient separation of lanthanum-cerium, praseodymium-neodymium and neodymium in fluorine-carbon cerium ore and improve product purity.

The application relates to the technical field of fluorine-containing wastewater treatment equipment, and discloses a fluorine-containing wastewater treatment device for praseodymium neodymium fluoride rare earth processing, which comprises a wastewater treatment tank, the top of the wastewater treatment tank is provided with a water inlet valve; a filtering and cleaning device comprises a water conveying pipeline vertically penetrating through the middle part of the top end of the wastewater treatment tank, the top end of the water conveying pipeline is communicated with the water inlet valve, the bottom of the water conveying pipeline is circular, uniform and horizontally provided with a plurality of water filtering channels, the bottom of each water filtering channel and the side far away from a water receiving disc are provided in an open mode, the bottom of the water filtering channel is covered with a first filter membrane, and the side far away from the water receiving disc of the water filtering channel is covered with a second filter membrane; when fluorine ions in fluorine-containing wastewater are separated and filtered through a filter membrane assembly, the filter time is effectively prolonged, the separation effect of the fluorine ions is improved, the surface of the filter membrane assembly is cleaned, and the effect of rare earth impurities on the membrane holes of the filter membrane is avoided.

The application relates to the field of alloy defect detection, and specifically discloses a praseodymium-neodymium alloy nondestructive detection method and system based on acoustic feature analysis, which comprehensively captures defect information contained in an original probe signal from two complementary physical perspectives of instantaneous dynamic characteristics and frequency band energy distribution by simultaneously adopting Hilbert-Huang transform and wavelet packet transform. Further, the scheme discards simple feature splicing, and instead utilizes canonical correlation analysis as an information decoupling tool to online decompose two groups of original feature vectors into a shared part describing defect commonality and unique information parts respectively representing the unique resolution capabilities of HHT and wavelet packet. Finally, the three decoupled components are structurally recombined to form a fusion feature vector which can effectively eliminate redundancy, amplify differences and has higher information density, thereby providing a clear structure and highly refined input for a subsequent classification model.

The invention discloses a modification method of a ternary positive electrode material. The modification method comprises the following steps: S1, carrying out a co-precipitation reaction on a solution of transition metal sulfate in an inert gas atmosphere; a sulfate solution of rare earth elements is synchronously added in the coprecipitation process, and a ternary precursor with the surface coated with rare earth hydroxide is formed; and S2, mixing the ternary precursor obtained in the step S1 with a lithium source, calcining in an air atmosphere, and cooling to obtain the fast ion conductor coated ternary positive electrode material, the rare earth elements are selected from one or more of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; the transition metal sulfate is soluble salt of Ni, Co and Mn. The rare earth element sulfate is added in the coprecipitation process, the rare earth element hydroxide is precipitated on the surface of the precursor, the lithium source is removed after filtering and drying, uniform mixing is performed, and the ternary positive electrode material which contains the rare earth element and is uniformly coated with the fast ion conductor is obtained after calcination, so that side reactions on the surface of the material are reduced; and the cycling stability of the positive electrode material is improved.

The invention provides a fully-synthetic magnesium alloy cutting fluid which comprises the following components in percentage by weight: 12-18% of a lubricant, 4-6% of an antirust agent, 2-5% of a corrosion inhibitor, 1-3% of a surfactant, 0.6-1.0% of a pH regulator, 0.4-0.6% of a defoaming agent, 0.3-0.5% of an antibacterial agent and the balance of deionized water. The corrosion inhibitor is composed of zinc acetate, praseodymium nitrate and phytic acid according to the mass ratio of (1.0-2.0): (1.2-1.8): (0.6-1.2). The invention further provides a preparation method of the total synthesis magnesium alloy cutting fluid. The fully-synthetic magnesium alloy cutting fluid prepared by the invention has excellent performance in the aspects of defoaming property, surface tension, corrosion resistance, anti-rust property, lubricity and the like, and provides long-acting and lasting protection for magnesium alloy processing.

The application belongs to the field of preparation of anode catalysts for solid oxide direct ammonia fuel cells, and particularly relates to a misfit-loaded praseodymium-based anode catalyst for direct ammonia solid oxide fuel cells and a preparation method thereof. 2+ doping Pr2NiO4 to prepare a perovskite Pr2Ni 1‑x Zn x O4 precursor, which is subjected to in-situ precipitation of Ni under a reducing atmosphere, is anchored on the catalyst surface in the form of an element, and is converted into Pr2O3 with the destruction of the structure of the precursor, and Zn 2+ with a high segregation Gibbs free energy is retained in the Pr2O3 lattice, realizing the rearrangement of each element, and forming a misfit-loaded Ni / Pr 2‑x Zn x O3 (PNZx), 0

A dielectric ceramic composition includes a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient including dysprosium (Dy) and praseodymium (Pr) as first accessory ingredients. A content of the Pr satisfies 0.233 mol≤Pr≤0.699 mol, based on 100 mol of the barium titanate base material main ingredient.

The invention relates to a microbial growth activation accelerant based on rare earth elements as well as a preparation method and application thereof, and belongs to the field of resources and environments. The microbial growth activation accelerant based on the rare earth elements is prepared from the following components: 1 to 150g of a rare earth compound, 0.2 to 2g of pantothenic acid, 0.2 to 2g of nicotinic acid, 0.02 to 0.1 g of nicotinamide and 1000g of deionized water, the rare earth compound is one or combination of more of chlorides of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium, nitric acid compounds and sulfuric acid compounds. A large number of cheap light rare earth elements are used as raw materials of the microbial accelerator, a new utilization approach is provided for the light rare earth elements, the light rare earth elements are converted into high-added-value products, pollution of the light rare earth elements to the environment is reduced, and meanwhile new elements are introduced into the field of microbial accelerators. More importantly, the preparation method of the microbial growth activation accelerant based on the rare earth elements provided by the invention is simple in production process and convenient for large-scale production.

Method for detecting high-energy radiation in a harsh environment, wherein the method comprises: Exposure of a scintillator single crystal to high-energy radiation at a temperature of more than approximately 175°C; and Detecting the high-energy radiation with an avalanche photodiode coupled to the scintillator, wherein the scintillator single crystal has a praseodymium-doped composition; characterized by the fact that the scintillator single crystal (La x Y 1-x ) 2Si2O7: Pr is, where (0, 2

The invention belongs to the technical field of functional ceramic manufacturing, and particularly relates to a high-entropy cobalt-based perovskite oxygen permeation membrane material and a preparation method and application thereof. According to the invention, La0. 5Sr0. 5CoO3 is used as a base material, and three different lanthanide elements of neodymium, gadolinium and praseodymium are doped at the site A of the base material, so that a series of high-entropy oxygen permeation membranes with carbon dioxide resistance and high stability are synthesized. The high-entropy cobalt-based oxygen permeation membrane material prepared by the method is compact in surface, has no obvious cracks, defects and through holes, has excellent mechanical properties, and can stably exist in low-oxygen corrosive atmospheres such as He / CO2 for 100 hours. Meanwhile, the high-entropy cobalt-based oxygen permeation membrane material prepared by the method has good oxygen permeation performance. A new way is provided for improving the structure and oxygen permeation stability of the OTM, and the carbon dioxide capture and storage efficiency of the OTM in the oxygen-enriched combustion technology is further improved.

An optical signal amplifier using a praseodymium doped fiber is described. The optical signal amplifier includes a signal laser, a first optical isolator, a second optical isolator a pump laser, a wave division multiplexer, a silica based glass optical fiber, a second optical isolator, an optical power meter, and an optical spectrum analyzer (OSA). The signal laser generates a signal laser beam. The pump laser generates a pumped laser beam. The wave division multiplexer combines the signal laser beam and the pumped laser beam and generates a combined laser beam. The silica based glass optical fiber has a preferred concentration of praseodymium ions of about 50×1024 ions / m3 and a length of about 5.7 m. The silica based glass optical fiber receives the combined laser beam, amplifies photons in the combined laser beam, and generates an amplified laser beam.

The invention relates to a method for plasma-assisted sintering of calcium stannate short-wave infrared long afterglow powder, the chemical composition of the long afterglow powder is Ca2SnO4: xEr < 3 + > / Pr < 3 + > / Nd < 3 + >, and x is more than or equal to 0.1 and less than or equal to 1; the long afterglow powder takes calcium stannate as a matrix and is formed by doping and sintering rare earth capable of emitting red light. The sintering adopts a stir-frying plasma assisted low-temperature sintering method, compounds containing an erbium element, a praseodymium element and a neodymium element are doped, namely erbium trioxide, praseodymium trioxide and neodymium oxide, and H3BO3 is added as a fluxing agent to prepare a sample. The method is low in energy consumption, and the yield of the calcium stannate fluorescent powder is effectively improved; according to the invention, short-wave infrared long-afterglow luminescence of doped ions is realized, and the emission wavelength is adjustable from 800nm to 1600nm.

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.