30results about How to "Complete restoration" patented technology

The invention relates to the field of metal processing, and particularly discloses a low-carbon steel oxide scale reduction annealing process and a hot galvanizing process, the low-carbon steel oxide scale reduction annealing process comprises the following steps: S1, pretreatment: firstly carrying out water / abrasive sand blasting treatment on a hot-rolled strip steel substrate, then washing with water, then heating to 650-700 DEG C at a heating rate of 50-60 DEG C / s, and keeping the temperature for 2-3 hours; after heat preservation treatment, taking out and immediately putting into a salt solution to obtain a pretreated base material; s2, reduction annealing: carrying out reduction annealing on the prepared pretreated base material in a reducing gas atmosphere; the hot galvanizing process comprises the following steps: carrying out oxide scale reduction annealing treatment on a hot-rolled strip steel base material; and hot galvanizing is conducted on the hot-rolled strip steel obtained after the oxide scale reduction annealing treatment is conducted in zinc liquid, a zinc coating is formed on the surface of the hot-rolled strip steel, and the hot-galvanized plate is prepared. The method has the characteristics that the oxide scale is effectively reduced, good adhesion of a zinc layer and a substrate is ensured, and the quality of a plating layer is improved.

The invention relates to the technical field of precious metal recovery, in particular to a precious metal recovery method. Comprising the following steps: filtering wastewater containing precious metals by using a precious metal recovery composite membrane, and drying the precious metal recovery composite membrane after filtering; then filtering an acidic aqueous solution by using the dried precious metal recovery composite membrane, and then continuously filtering and cleaning by using clear water; the cleaned precious metal recovery composite membrane is put into an N, N-dimethylformamide soaking solution, then ultrasonic oscillation treatment is conducted, the composite membrane is taken out of the soaking solution, then centrifugal treatment is conducted on the soaking solution, precipitates are collected, and the precious metal particles are obtained. The precious metal is recovered by adopting a membrane filtration method, and compared with an impregnation method, a large amount of membrane cost is saved, so that the precious metal recovery cost is reduced, and the method is suitable for industrial metal recovery.

A zinc-containing dust fluidization hydrogen group reduction comprehensive utilization method belongs to the technical field of zinc-containing dust treatment, and comprises the following steps: screening and crushing collected zinc-containing dust, and then drying to obtain pretreated zinc-containing dust; nitrogen is introduced into the fluidization reaction device, the zinc-containing dust is added for heating, and after the temperature is stable, hydrogen is introduced to reduce the flow of the nitrogen; when the hydrogen flow reaches a specified value, the hydrogen channel is kept open, the nitrogen channel is closed, and fluidized hydrogen group reduction roasting is carried out by controlling the temperature; after gaseous zinc is formed, the gaseous zinc enters a condensation system with inert gas along with hydrogen flow to be condensed into metal zinc particles, the metal zinc particles are collected and recycled, and solid metal iron is reserved at the bottom of the reaction device; and the roasted gas enters a tail gas treatment system and is recycled after being purified. Hydrogen reduction adopted by the method has lower environmental influence, the rapid and thorough reduction process can be achieved under the high-temperature condition, and the current requirements of green metallurgy and low-carbon economy are met.

The invention discloses a preparation method of aerosol microscale printing self-reduction mixed type conductive silver ink, which comprises the following steps: dissolving a complexing agent and an additive in a solvent to obtain a mixed solution A; dissolving a silver precursor in the mixed solution A to obtain a silver-ammonia complexing solution; dissolving a volatile compound which has no reducibility at room temperature and can release strong reducibility substances after being heated into the silver-ammonia complexing solution to obtain a mixed solution B; and finally, dropwise adding a volatile weak reducing substance into the mixed solution B, and reacting while dropwise adding until the volatile weak reducing substance is completely dropwise added, so as to obtain the aerosol micro-scale printing self-reduction mixed conductive silver ink. The mixed conductive silver ink is prepared, two different types of reducing agents are adopted to cooperate with each other, the mixed conductive silver ink has the advantages of both granular ink and particle-free ink, the film-forming property of the ink is improved, high-precision printing is achieved, and the printing requirements of various printed circuits and special-shaped circuits can be met.

The invention belongs to the technical field of cathode materials for plasma generators, and provides a silver-based material and a preparation method thereof, a cathode assembly and a plasma generator. The preparation method comprises: S1, adding silver nitrate, tin acetate, indium salt and zinc salt into water, stirring, adding sodium hydroxide solution until the pH value is 9-11, and obtaining a suspension; S2, adding polyacrylamide into the suspension, performing flocculation precipitation, and obtaining a composite precipitate; S3, heating the composite precipitate to 100-150°C in a reducing atmosphere, keeping the temperature, and then heating to 250-300°C, keeping the temperature, and obtaining a multi-component composite metal oxide silver composite powder; S4, hot isostatic pressing and sintering the multi-component composite metal oxide silver composite powder to obtain a silver-based material coarse material; S5, hot forging the silver-based material coarse material to obtain a silver-based material. The silver-based material obtained by the invention solves the problems of poor dispersion and easy ablation of metal oxides in existing silver-based materials.

The invention provides a titanium dioxide-graphene composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing a certain amount of graphene oxide in an organic solvent to obtain a graphene oxide solution; adding butyl titanate into the graphene oxide solution, and stirring and mixing to obtain a first mixed solution; uniformly mixing a certain amount of nonionic surfactant with water to obtain a second mixed solution; gradually adding the second mixed solution into the first mixed solution, and uniformly stirring to obtain a third mixed solution; and carrying out hydrothermal treatment on the third mixed solution at a predetermined temperature for a predetermined time, cooling, filtering and drying to obtain the titanium dioxide-graphene composite material. According to the method, the preparation efficiency is high, and the photocatalytic performance of the titanium dioxide-graphene composite material is improved.

The invention discloses a hydrophilic PPy / 3DRGO / WSP5 composite material and a preparation method and application thereof. The method adopts a one-step synthesis method, uses water-soluble cationic quaternized pillar [5] aromatic hydrocarbon and graphene oxide as raw materials, adds pyrrole, mixes evenly and then undergoes hydrothermal reaction to obtain a hydrophilic PPy / 3DRGO / WSP5 aerogel composite material. The hydrophilic PPy / 3DRGO / WSP5 aerogel composite material of the invention has the electrical conductivity of three-dimensional graphene and polypyrrole, the excellent hydrophilic property of WSP5, and a porous structure, and is suitable for use as a conductive material in electrochemical sensors, batteries, etc.

The invention relates to the technical field of pre-reduction type catalyst production, and discloses a method for producing a pre-reduction type ammonia synthesis catalyst by using pure hydrogen reduction, which comprises the following steps: filling an oxidation state ammonia synthesis catalyst into a reduction tower, and introducing reducing gas for reduction; the reduction process comprises the following stages: a heating stage, an initial reduction stage, a main reduction stage and a later reduction stage; after the reduction process is finished, shielding gas is introduced to replace hydrogen, the temperature of the catalyst is reduced to 50 DEG C or below, then the passivation process is performed, and the pre-reduction type ammonia synthesis catalyst is obtained after the passivation process is finished. According to the pre-reduction type ammonia synthesis catalyst produced through the method, reduction and passivation of the catalyst are sufficient, the reduction quality of the catalyst is stable, the production process is efficient, energy-saving and environmentally friendly, electric energy is saved by 8% or above during production of the pre-reduction type ammonia synthesis catalyst, raw material reducing gas is saved by 25% or above, waste water discharge is avoided, and almost no environmental protection cost exists.

The invention discloses a distributed optical fiber vertical seismic DAS-VSP data capacity optimization method. According to the method, firstly, the slope difference between adjacent data points in a data point set is calculated, judgment is carried out according to a preset threshold value, redundant data points which have weak influence on the overall seismic signal trend form can be accurately recognized and deleted, and therefore the scale of the data set is remarkably reduced at the source, and first-layer compression is achieved. And then, carrying out differential coding processing on the optimized data point set after redundancy is removed, and only storing or transmitting a difference value between adjacent key data points to replace an original large value, so that the value representation range of the data is further reduced, and efficient compression of a second layer is realized. Finally, the initial data point and the differential set are packaged into a compact data frame, so that the total data amount is greatly reduced, and the resource occupation of the storage space and the network bandwidth is remarkably reduced.

The utility model discloses a substitute body for dental implant, the substitute body is made of resin material and comprises a butt joint part, a positioning section and a fixing section, the butt joint part is arranged inside the fixing section, the butt joint part is connected with an abutment, the positioning section is connected with a dental cast body, the positioning section, the connecting part and the fixing section are arranged along the same central axis, and the butt joint part is connected with the positioning section. A butt joint groove is formed in the center of the butt joint part, the butt joint groove comprises a transition section and a clamping groove with the cross section being in a regular polygon shape, arc-shaped protrusions are arranged on the outer surface of the positioning section, the number of the protrusions is the same as that of the sides of the clamping groove, and the positions of the sides of the clamping groove correspond to the positions of the protrusions in a one-to-one mode. The oral cavity replacement device is reasonable in structural design, conditions in the oral cavity of a patient can be restored more sufficiently after the base is installed on the replacement body, and the replacement body can be installed and adjusted more conveniently; a dentist technician accurately restores the condition in the oral cavity of a patient through the replacement body, and the manufactured false tooth is excellent and is more adaptive to the oral cavity of the patient.

The invention relates to a manufacturing method of a high-density tungsten-copper alloy. The manufacturing method comprises the following steps that S1, a tungsten-copper powder mixture with the preset particle size and particle size is manufactured; s2, the tungsten-copper powder mixture and a binder are subjected to mixing treatment, and a blank making raw material is prepared; s3, the blank making raw materials are made into needed blanks; s4, organic matters and other impurities in the blank are removed; s5, the blank is subjected to heating oxidation treatment; and S6, sintering the blank in an environment with a reducing agent. The tungsten-copper alloy has the effect that the prepared tungsten-copper alloy has higher density.

This invention discloses a wastewater treatment agent for thallium-containing wastewater and its preparation method, belonging to the field of environmental engineering technology. It features a large specific surface area and porosity, abundant active sites, and a molecular sieve effect. In its spatial structure, the wastewater treatment agent has a gradient porous structure, with a large-pore inner layer, a small-pore outer layer, and a middle layer containing manganese dioxide sites with oxidizing properties. The difference in pore size between the inner and outer layers protects the internal oxidizing component, manganese dioxide, from interfering with the active sites due to byproducts. Furthermore, the gradient porous structure increases adsorption and improves thallium removal. The modified polystyrene microspheres in this invention contain sulfonic acid groups on their surface. After coordination interaction with manganese ions, they can bind to positively charged thallium ions through electrostatic attraction, achieving the adsorption and enrichment of thallium ions.

The present invention belongs to the technical field of resource recovery. The present invention provides a method for recovering platinum from a mother liquor produced by a P salt, comprising the following steps: subjecting the mother liquor to a deamination reaction under alkaline conditions to obtain a deamination mother liquor; subjecting the deamination mother liquor to an acidification reaction and an oxidation reaction in sequence to obtain an intermediate mother liquor; subjecting the intermediate mother liquor to a primary reduction reaction and a secondary reduction reaction in sequence, calcining to obtain sponge platinum, and completing the recovery. The platinum recovery method provided by the present invention has simple process operation, and the calcination and decomposition process is environmentally friendly and safe; other metal impurities are not introduced, and the oxidation precipitation of dinitrosodiammine platinum is avoided, solving the problem of easy explosion during calcination and decomposition. At the same time, the platinum reduction in the recovery method of the present invention is thorough, the recovery efficiency is high, and a platinum product that meets national standards (platinum purity ≥ 99.95%) can be directly obtained; it is suitable for large-scale industrial production.

The application belongs to the technical field of metal powder preparation, and particularly relates to high-purity rhenium powder and a preparation method thereof. The high volatility of rhenium oxide is utilized, efficient volatilization of rhenium oxide is realized under vacuum conditions, and the high activity of hydrogen radio frequency plasma is utilized to rapidly and completely reduce the rhenium oxide vapor into high-purity rhenium powder, so that the reduction reaction efficiency is significantly improved, efficient and clean preparation of rhenium powder is realized, the problem of impurity introduction in the traditional reduction method can be avoided, and the product purity and particle size can meet the application requirement of high-end fields.

The invention discloses a regeneration method for lithium battery waste, belongs to the technical field of waste battery regeneration, and mainly relates to a hydrogen reduction roasting method for lithium battery waste, including three-stage reduction roasting; the temperature of the first stage reduction roasting is 450±20℃, the hydrogen flow rate is 10‑15m 3 / h tons of material, the reduction roasting time is 10-20min, the second stage reduction roasting temperature is 530±40℃, and the hydrogen flow rate is 20-30m 3 / h tons of material, the reduction roasting time is 10-40min, the temperature of the third stage reduction roasting is 620±30℃, and the hydrogen flow rate is 25-30m 3 / h tons of material, and the reduction roasting time is 10-30min. After the roasting product is leached, the leachate is further treated to remove impurities and precipitate lithium to prepare a lithium salt product, and the leached residue is subsequently treated to separate and recover nickel and / or cobalt and manganese. The method of the present invention can achieve simple and efficient separation of valuable elements in lithium battery waste.

The invention discloses a sewage and wastewater nitrate nitrogen reduction system based on friction power generation, and relates to the technical field of water treatment and resource recovery. The system comprises a pretreatment module, a biological nitrification module, an ammonia conversion module and an ammonia salt recovery module which are connected in sequence. The pretreatment module is used for removing suspended matters and organic matters; the biological nitrification module is used for converting ammonia nitrogen and organic nitrogen into nitrate nitrogen; the ammonia conversion module is provided with a friction power generation reduction unit, charges are generated through friction between water flow and a high polymer material flow channel to form a reduction electric field, and nitrate nitrogen is directly reduced into ammonia nitrogen; and the ammonia salt recovery module recovers an ammonia salt product through an acid adding crystallization process. The fluid kinetic energy is utilized to drive the reduction reaction, external energy and carbon sources are not needed, pollutants are converted into valuable ammonia salt fertilizer, and conversion from'end treatment 'to'resource recovery' is achieved. The system is low in operation cost, high in impact load resistance and suitable for high-nitrogen industrial wastewater treatment in photovoltaic, food processing and the like.

The invention discloses a high-purity ultralow-oxygen-content ruthenium-tantalum alloy target material and a preparation method thereof, and belongs to the technical field of magnetron sputtering alloy target materials. The method comprises the following steps: (1) mixing powder; (2) low-pressure pre-pressing; (3) performing high-vacuum calcination; (4) hot isostatic pressing sintering; and (5) grinding and polishing. The ruthenium-tantalum alloy target with the purity larger than or equal to 99.995% and the oxygen content smaller than or equal to 20 ppm is prepared through the preparation method, so that when the ruthenium-tantalum alloy target is used as a diffusion barrier layer material, the ruthenium-tantalum alloy target has low resistance and excellent barrier performance, and the performance of a diffusion barrier layer film is improved.

The invention discloses a preparation method of lithium sulfide, a solid-state electrolyte and a solid-state battery, the lithium sulfide is used for preparing the solid-state electrolyte, and the preparation method comprises the following steps: uniformly mixing lithium sulfate, an organic carbon source and a high-molecular polymer in a solvent to obtain a mixed solution; wherein the mass ratio of the lithium sulfate to the organic carbon source is 1: (0.7-1), and the mass ratio of the organic carbon source to the high-molecular polymer is (0.7-1): (0.1-2.5); the ratio of the mass sum of the residual carbon amount of the organic carbon source and the residual carbon amount of the high-molecular polymer to the mass of the lithium sulfate is (0.2-0.25): 1; carrying out spray drying on the mixed solution to obtain a precursor material; and sintering the precursor material to obtain the product lithium sulfide. The sulfide solid electrolyte prepared by the preparation method is high in purity and low in carbon impurity content.

This invention provides a method for recovering valuable elements from NdFeB waste through co-reduction smelting of electronic waste. The method involves mixing powdered NdFeB waste and fine-grained electronic waste with a slagging agent and a solid reducing agent, and then using a top-blown smelting furnace to reduce and smelt the mixture. By controlling the conditions of the reduction process, the oxides of copper and iron in the mixture are reduced to metallic copper and metallic iron. These two metals then aggregate with rare and precious metals such as gold and silver from the electronic waste to form a copper-iron precious metal alloy. Rare earth oxides are not reduced and remain in the slag layer. The copper-iron precious metal alloy particles are denser than the rare earth slag and sink rapidly to the bottom of the furnace. After settling and stratification, the copper-iron precious metal alloy melt and the rare earth slag are discharged separately from the metal outlet and slag outlet, respectively. This method achieves the simultaneous recovery of rare earth elements from NdFeB waste and copper, gold, and silver from electronic waste. The process is short, energy-efficient, and offers significant economic and environmental benefits.

The invention provides a crude palladium purification method, and belongs to the technical field of precious metal purification. Palladium and other precious metals in crude palladium are dissolved by adopting aqua regia, then palladium ions are oxidized into high-valence palladium by adopting an oxidizing agent, and then the high-valence palladium forms palladium salt precipitation by adopting a precipitating agent, so that the purity is improved; then, palladium salt is dissolved with an inorganic solvent, platinum, copper, iron and silver impurities can be removed, and therefore the purity of palladium is improved; palladium ions in the filtrate are complexed by adopting a first complexing agent, and palladium salt precipitate can be obtained, so that impurities are removed, and the purity of palladium is improved; then, palladium ions are further complexed by adopting a second complexing agent, so that the purity of palladium is further improved; and then electrodeposition is adopted to ensure that palladium ions are fully reduced into palladium powder, so that the purity of palladium is improved. Experimental results show that the purity of the palladium powder obtained through the purification method is larger than or equal to 99.95%.

The invention discloses a coal-ammonia co-combustion control system and method based on ammonia cracking ignition, and belongs to the technical field of combustors. The coal-ammonia co-combustion control system comprises an initial operation module used for obtaining a coal-ammonia co-combustion execution label; the monitoring evaluation module is used for performing analysis based on the coal-ammonia co-combustion execution label, if the coal-ammonia co-combustion execution label is normal in co-combustion, performing no execution processing, and if the coal-ammonia co-combustion execution label is abnormal in co-combustion, performing analysis to obtain a co-combustion abnormality tracking label, and marking the monitoring area with the coal-ammonia co-combustion execution label being abnormal in co-combustion as a monitoring tracking area; the mixed combustion adjusting module is used for executing corresponding correction processing; and the adjustment verification module is used for obtaining a correction verification label, if the correction verification label is corrected to be effective, secondary correction processing is not executed, otherwise, the adjustment verification module returns to the multi-fuel combustion adjustment module to execute secondary correction processing until the correction verification label is corrected to be effective.

The application belongs to the field of catalytic materials, and specifically discloses a preparation method of a nano high-entropy alloy material and application of the material in oxygen electrocatalysis. The preparation method is as follows: a multi-metal organic complex, a reactive metal and a molten salt are mixed and calcined, and then subjected to simple water washing treatment and alkali washing modification treatment to obtain the nano high-entropy alloy material; the multi-metal organic complex is a complex formed by a metal M source and an organic complexing agent, and the metal M contains five or more than five kinds of Fe, Co, Ni, Cr, Mn, Cu, V, Mo, Ti, Au, Ag, Pt, Pd, Ru, Ir and Rh. The application also includes the material prepared by the preparation method and application of the material in OER / ORR catalysis. The material prepared by the method has excellent OER / ORR catalytic activity and stability.

The application discloses a kind of UN powder's quick preparation method, solve the carbon-thermal reduction-nitriding reaction method in prior art difficult to obtain high-purity UN powder, arc smelting method high cost, long cycle problem.A kind of UN powder's quick preparation method of the application, UO2 powder is reduced into metal uranium using metal reduction method, then using reaction heat makes metal uranium and nitrogen gas nitriding reaction, obtains UN powder.The application is more efficient, the reaction process is faster, more sufficient, UN production cycle is compared with arc smelting method greatly shortened, even shorter than carbon-thermal reduction method, can realize the batch preparation of high-purity UN powder in very short time.

The invention relates to the technical field of catalyst preparation, and particularly discloses a preparation method of a high-activity palladium catalyst. The preparation method of the high-activity palladium catalyst comprises the following steps: (1) dissolving palladium chloride or palladium nitrate in deionized water to form a palladium solution; (2) adding a carrier into the palladium solution, and dipping at 40-60 DEG C for 12-24 hours to obtain a mixture; and (3) adding a cocatalyst into the mixture, and reducing for 2-4 hours at 250-300 DEG C in a hydrogen atmosphere to obtain the high-activity palladium catalyst, the carrier is one of activated carbon, aluminum oxide and carbon nanotubes; the cocatalyst is a metal oxide. The high-activity palladium catalyst prepared in the invention has high catalytic activity, and through cooperation with process parameters of the preparation steps, sufficient adsorption and reduction of palladium ions are ensured, so that the catalytic effect is enhanced.

The present invention belongs to the technical field of phosphor preparation, and discloses a quasi-spherical red phosphor, wherein the quasi-spherical red phosphor is obtained by sintering raw material powder with a particle size of less than 2 μm and a spherical crystal morphology twice under a reducing atmosphere, wherein the second sintering is a mixing of a sintered material obtained by the first sintering and the raw material powder at a mass ratio of 1:4-8 and then a second sintering. The present invention obtains a sintered material with a smaller crystal particle size by sintering part of the raw material for the first time, and mixes the sintered material obtained by the first sintering with the remaining raw material powder in proportion for the second sintering, and controls the process of the second sintering so that the particles of the raw material can adhere to and grow on the surface of small grains during the second sintering process to form large grains to produce an effect similar to overmolding, thereby improving the sphericity of the red phosphor.

The invention provides a converter valve hall water leakage simulation test device. The converter valve hall water leakage simulation test device comprises a movable chassis, a circulating water supply mechanism arranged on the movable chassis, a telescopic water supply support, a leakage point simulation assembly rotationally connected to the top of the telescopic water supply support, and an external communication unit. The leakage point simulation assembly comprises a plurality of water droppers used for simulating water leakage of the converter valve and the valve hall. The circulating water supply mechanism is communicated with a water path of the leakage point simulation assembly through a water supply pipeline of the telescopic water supply bracket; according to the device, water recycling is achieved by arranging the circulating water supply mechanism, the environmental cleanliness and converter valve equipment are not damaged, movement and stopping of the movable chassis are remotely operated through the external communication unit, and a valve hall all-directional water leakage test is carried out; water leakage tests are carried out at different positions and heights of the valve hall by adopting the telescopic water supply bracket and the plurality of water droppers, so that the real environmental conditions of water leakage of the valve hall can be fully restored, and abundant test objects are provided for verifying the water leakage detection method of the valve hall of the converter station.

The present application relates to a kind of vanadium-aluminum alloy and its preparation method.The method comprises: after drying, vanadium oxide, slagging agent and aluminum-calcium alloy particles are mixed uniformly, the vanadium oxide is the mixture of vanadium pentoxide and di vanadium trioxide;Preheating;Take 10wt%-20wt% of mixed material to initiate in-situ composite thermal reduction reaction, form 1600℃-1950℃ high-temperature molten pool;The remaining material is pressed into the material ball with a diameter of 1.0-3.0 cm under 5-20 MPa pressure, and the obtained material ball is continuously added to the molten pool to maintain the temperature for reaction, while the reduction slag and alloy melt are separated;Cooling and deslagging to obtain vanadium-aluminum alloy ingot.The present application uses aluminum-calcium alloy particles as reducing agent, and utilizes its in-situ slagging function, combined with different valence vanadium oxide to control reaction heat, and continuous feeding process, realizes accurate control of composition, significant reduction of inclusions, efficient slag-gold separation, and the prepared vanadium-aluminum alloy has very low oxygen and nitrogen impurities, and the process flow is short, the cost is low, and it is suitable for aerospace-grade titanium alloy production.

The invention discloses a test device for simulating subway station excavation under the influence of an existing tunnel and an excavation method. The test device comprises a model box, and a station simulation structure, an existing tunnel simulation structure and data monitoring and acquisition equipment which are arranged in the model box. The existing tunnel simulation structure is arranged above the station simulation structure, and the model box and the inner space of the station simulation structure are filled with test soil. The data monitoring and collecting equipment is assembled on the station simulation structure, the existing tunnel simulation structure and the surface layer position of the test soil body. The invention further discloses an excavation method for excavating the subway station based on the experimental device, and the stress-strain and displacement rules of the subway station and the existing tunnel in the subway station excavated by the underground excavation arch cover method under the influence of the existing tunnel in a complex environment are analyzed and researched. And reference is further provided for optimization of the design and construction scheme of excavation of the subway station through the arch cover method and the underground excavation arch cover method for penetrating through the existing tunnel in the complex environment.

The invention provides a fluidized repair roasting regeneration method for a new energy lithium iron phosphate battery positive electrode material, and belongs to the technical field of resource utilization of waste lithium ion batteries. Comprising the following steps: firstly, crushing and screening a positive plate obtained by discharging, disassembling and stripping the waste lithium iron phosphate battery to obtain lithium iron phosphate positive powder, and roasting the lithium iron phosphate positive powder; carrying out wet grinding to obtain slurry; and granulating and drying the slurry to obtain porous spherical precursor particles, carrying out fluidized high-temperature regeneration roasting, washing with water, and drying to obtain the high-performance new energy lithium iron phosphate battery positive electrode material. The new energy lithium iron phosphate battery positive electrode material prepared by the invention not only has high first discharge specific capacity and good cycle performance, but also has higher tap density and better processability due to the spherical morphology and proper particle size distribution, and can be directly used for preparation of new batteries.

The utility model discloses an imaging system for bracket Mini-LED rubber surface defect detection. The imaging system comprises a detection camera, a conveying mechanism, a backlight mechanism, a multi-area annular light source, a jacking mechanism and a pressing and leveling unit, the conveying mechanism is used for conveying a to-be-tested Mini-LED board, and a conveying space is arranged in the middle of the conveying mechanism. A detection camera is arranged on the upper side or the lower side of the conveying mechanism, a multi-area annular light source is arranged on the peripheral side of the detection camera, a pressing and leveling unit is arranged between the detection camera and the conveying mechanism, and the jacking mechanism is used for lifting a to-be-detected Mini-LED plate and enabling the Mini-LED plate to be attached to the back side of the pressing and leveling unit. A detection cavity with a hollow structure is arranged in the middle of the pressing and leveling unit corresponding to a detection area of the Mini-LED board to be detected; a backlight mechanism is arranged on the back side of the to-be-tested Mini-LED board. The multi-zone annular light source time-sharing stroboscopic illumination is adopted, and the backlight mechanism and the pressing and leveling unit are combined, so that the interference of background information on rubber surface detection information is reduced or even eliminated, the texture state of the rubber surface can be fully restored, and the practicability is better.