35 results about "Minor metals" patented technology

The invention relates to the technical field of soil detection, in particular to a soil trace metal element biological effective state extraction device and a determination method.The soil trace metal element biological effective state extraction device comprises a support, a horizontally-arranged bearing plate is fixedly connected to the center of the support, and cylindrical diffusion pools in a linear array are arranged on the bearing plate; the cylindrical diffusion pool is internally and fixedly connected with a root system simulation pipe, the root system simulation pipe is located in the center of the diffusion pool and is cylindrical, the pipe wall of the root system simulation pipe is provided with holes, the hole diameter is 0.5 mm, and the pipe wall of the root system simulation pipe is wrapped with a layer of filter membrane with the hole diameter of 0.45 mu m. The diffusion and migration process of effective metal elements in the soil and the influence of root exudates on the process can be well simulated, the method is more suitable for extracting the biological effective state of the soil trace heavy metal elements, and accurate measurement of the effective state content of the soil trace heavy metal elements and accurate prediction of absorption of the plant trace heavy metal elements are more facilitated.

According to the carbon-coated nickel-based hydrogen storage alloy and the batch preparation method, nickel serves as a base material, rare earth elements are introduced to optimize the grain structure and inhibit the hydrogen embrittlement phenomenon, transition metal is combined to regulate and control the hydrogen storage dynamic performance, meanwhile, trace metal elements are added to enhance the oxidation resistance, nickel-based alloy components are precisely regulated and controlled through suspension smelting, and the carbon-coated nickel-based hydrogen storage alloy is obtained. Smelting under the protection of argon; the method comprises the following steps: converting molten alloy into micron-sized particles by adopting a high-pressure gas atomization process, introducing an olefin-containing mixed atmosphere into an atomization tower, cracking olefin at a high temperature by utilizing the catalytic activity of a nickel surface, and generating a graphitized carbon coating layer in situ in an atomization flight process; and the carbon layer structure is optimized through multi-stage annealing and trace oxygen passivation treatment subsequently, the carbon-coated nickel-based hydrogen storage alloy with high thermal conductivity and excellent cycle stability is finally obtained, the single-time treatment capacity reaches the hundred-kilogram level, and low-cost batch preparation is achieved.

The utility model discloses a device for separating trace metal from solid waste, which comprises a grinder, a powder mixer, a rotary molten slurry furnace, a pressurizing pipe blowing device, a container and a water cooling tank, the outlet of the grinder is connected with the inlet of the powder mixer, the outlet of the powder mixer is connected with the inlet of the pressurizing pipe blowing device, and the container is connected with the water cooling tank. An outlet of the pressurizing pipe blowing device extends into the rotary molten slurry furnace, an inclined rotating mechanism for controlling the rotary molten slurry furnace to rotate and incline is arranged outside the rotary molten slurry furnace, the rotary molten slurry furnace is provided with a pouring edge opening, the lower part of the edge opening is connected with a container, and the container is conveyed into a water cooling tank through hoisting to cool and shape molten slurry. The solidified and shaped molten slurry is fed into an inlet of a grinding and crushing machine through a spiral conveyor, an outlet of the grinding and crushing machine is connected with a magnetic separator, and metal crushed aggregates obtained by the magnetic separator enter a storage box through a discharging valve; the device disclosed by the utility model can realize recovery of trace metals in high-temperature molten steel slag.

The invention discloses a multi-stage pickling and impurity removal method for a coal-based hard carbon precursor for sodium storage, comprising the following steps: pickling and impurity removal of coal-based material powder according to a mixed acid secondary pickling and impurity removal method or a single acid tertiary pickling and impurity removal method to obtain pickled coal-based material powder; sintering the pickled coal-based material powder at 500-800°C for 0-4h in an inert atmosphere, then carbonizing at 800-1450°C for 0.5-18h, and cooling to room temperature to obtain a coal-based sodium ion battery hard carbon material. The sodium ion battery prepared from the coal-based sodium ion battery hard carbon material has a first-cycle charge specific capacity of 270-300mAh / g, a first-cycle discharge specific capacity of 300-320mAh / g, a first-cycle coulomb efficiency greater than 90%, and trace metal elements and magnetic substances in the coal-based sodium ion battery hard carbon material meet the national standard for sodium ion battery hard carbon.

The invention relates to the technical field of waste salt treatment, in particular to a method for removing heavy metal in waste salt. The method is realized by preparing the nano molybdenum disulfide-resin composite material. According to the composite material, resin serves as a carrier, and nano molybdenum disulfide is stably attached to the interior and the surface of the carrier. The preparation method of the composite material comprises the following steps: (1) taking resin, and sequentially carrying out salt soaking, acid pickling, water washing, alkali washing and water washing treatment; (2) drying the resin in the step (1), and cooling to normal temperature for later use; (3) dissolving a molybdenum source and a sulfur source in deionized water, and carrying out ultrasonic treatment to obtain a mixed solution; and (4) adding the resin treated in the step (2) into the mixed solution in the step (3) to react, cooling the reaction solution to room temperature after the reaction is ended, washing and drying to obtain the nano molybdenum disulfide-resin composite material. The method has more efficient and lasting adsorption removal performance on trace metal ions and other heavy metal pollutants.

The invention discloses an axle laser cladding repairing method and structure based on gradient phase change regulation, and the method comprises the following steps: cladding an interface layer, a transition layer and a surface layer in sequence through a laser cladding method to form a gradient cladding structure; cladding the first mixed powder on the surface of the axle base body by adopting a low-heat input cladding process to form an interface layer; wherein high-Cr and Ni powder is adopted in the first mixed powder, and the first mixed powder is used for expanding the temperature interval of an austenite phase region; cladding the second mixed powder on the surface of the interface layer by adopting a slightly high heat input cladding process to form a transition layer; wherein the second mixed powder contains trace metal elements B and Mo; cladding the third mixed powder on the surface of the transition layer by adopting a rapid cooling cladding process to form a surface layer; wherein low-C and high-Si alloy powder is adopted as the third mixed powder, a lath martensite structure is formed, martensite phase change volume expansion is achieved, and surface pressure stress is introduced.

The invention provides a die-casting aluminum alloy material and a preparation method of the die-casting aluminum alloy material, and belongs to the technical field of die-casting aluminum alloy materials. The aluminum alloy material comprises the following components in percentage by weight: 0.05 percent to 0.1 percent of silicon, 0.45 percent to 0.83 percent of iron, 0.018 percent to 0.05 percent of copper, 1.2 percent to 2.6 percent of manganese, 0.35 percent to 0.7 percent of magnesium, 3.3 percent to 4 percent of zinc, 0.04 percent to 0.08 percent of chromium and the balance of aluminum and inevitable impurities containing trace metals. The technical problem to be solved by the invention is to overcome the defect that the surface of the conventional die-casting aluminum alloy after anodic oxidation is grey black and cannot be subjected to color treatment.

The invention provides a glass ceramic precursor, a preparation method and an application of the glass ceramic precursor in preparation of glass ceramic, the characteristic of high silicon in lead-zinc smelting depleted slag is utilized, household garbage incineration fly ash which is a dangerous waste is added, and the glass ceramic precursor can be prepared after melting-water quenching treatment; on one hand, the smelting depletion slag and the household garbage incineration fly ash can be digested, on the other hand, trace metals in the smelting depletion slag and the household garbage incineration fly ash are immobilized, the strength of the glass ceramic prepared from the glass ceramic precursor is improved, and therefore the utilization efficiency and the additional value of the smelting depletion slag and the household garbage incineration fly ash are effectively improved.

The invention discloses a bidirectional high-thermal-conductivity graphene bulk and a preparation method thereof. Trace metal is introduced to the surface of a two-dimensional graphene film through ion implantation so as to improve the wettability of graphene and metal. And then, sequentially depositing a copper nano layer and a silver nano layer on the surface of the carbide-modified graphene film formed by the trace metal to obtain the metallized graphene film. And finally, coalescing the metallized graphene film through a discharge plasma sintering technology to prepare a graphene block material. The graphene block has the characteristics of excellent molecular interface structure stability adapting to an extreme environment, in-plane and out-plane bidirectional high heat conduction performance and modular assembly compatible with industrial production, and large-scale production of any thickness, area and shape is easy to realize.

The invention relates to the technical field of a produced liquid stratum source identification method, in particular to a method for judging an oilfield produced liquid stratum source, which comprises the following steps of: calculating the similarity S1 between a crude oil trace metal element fingerprint spectrum of a sample to be determined and a crude oil trace metal element standard fingerprint spectrum of a target stratum; the similarity S2 between the stratum water trace metal element fingerprint spectrum of the sample to be determined and the stratum water trace metal element standard fingerprint spectrum of the target stratum is calculated, if the S1 and the S2 are both larger than 0.9, the produced liquid from the stratum to be determined comes from the target stratum, and if the S1 and the S2 are not larger than 0.9 at the same time, the produced liquid from the stratum to be determined does not come from the target stratum. According to the method, the trace metal element composition of the crude oil and the formation water in the produced liquid is converted into the trace metal element fingerprint spectrum for the first time to determine which formation the produced liquid comes from, so that the difference information of the crude oil and the formation water in the produced liquid can be more intuitively reflected, and the accuracy of judging the source of the produced liquid is improved.

The invention provides a preparation method of trace metal element doped carbon dots, which comprises the following steps: mixing biomass, trace metal elements, a strong alkali solution and a strong oxidant in ultrapure water, pouring the obtained mixed solution into a reaction kettle for hydrothermal reaction, and cooling to room temperature after the reaction to obtain a reaction solution; and filtering the reaction solution, adjusting the pH value of the obtained filtrate, and dialyzing to obtain a solution which is the trace metal element doped carbon dot material. The prepared trace metal element doped carbon dot material promotes the salt tolerance and metal stress resistance of plants, the trace metal element doped carbon dots are suitable for seed soaking before plant sowing or irrigation and spraying in the plant seedling stage, the adaptability of the plants in a salinization environment or heavy metal contaminated soil is enhanced, and seed germination and seedling growth are promoted. The trace metal element doped carbon dot material prepared by the method is wide in raw material source, low in cost, easy to store, relatively high in practicability and beneficial to popularization.

The invention relates to a method for preparing a high-strength heat-resistant Al-Si eutectic alloy, in particular to a method for preparing a high-strength heat-resistant Al-Si eutectic alloy through multi-element microalloying and heat treatment regulation. The invention aims to solve the technical problem that the existing Al-Si eutectic alloy is poor in strength and heat resistance. The prepared alloy needs to be subjected to the processes of smelting, remelting, T6 heat treatment and the like to achieve high hardness and high strength, the structure morphology and a second phase are regulated and controlled through the T6 heat treatment process, and a unique microscopic structure of twin crystals and stacking faults appears due to addition of trace metal elements; through introduction of multi-element microalloying alloy elements, the volume fraction of an Al3 (Zr, Er, Sc)-L12 phase is remarkably increased, the consistent effect of twin crystal and stacking fault on dislocation is enhanced, and the high-temperature service condition of the Al-Si eutectic alloy is met.

The application relates to the technical field of inorganic high-purity powder material preparation, in particular to a continuous preparation process of high-purity magnesium oxide particles, the purity of the magnesium oxide particles is not less than 99.95%, the D50 particle size is 1.8-2.1 mu m, the particle size distribution span is 0.70-0.85, the total content of trace metal impurities is 2.1-4.2 ppm, the thermal weight loss rate is 0.04%-0.08%, and the bulk density is 0.48-0.55 g / cm 3 3 . The application adopts a continuous production mode, replaces a traditional batch process, realizes whole-process continuous operation of raw material feeding, reaction, crystallization, washing, drying, calcination and grading, greatly improves the stability and uniformity of a production process, eliminates batch quality differences, and adapts to industrial large-scale production requirements.​

The utility model discloses a powder coating trace metal impurity removing and sorting device which comprises a filtering cylinder, a first filtering plate and a second filtering plate, cylinder covers are installed at the two ends of the filtering cylinder, a discharging opening is formed in the lower half portion of the filtering cylinder, the first filtering plate is arranged in the discharging opening, a groove body is installed in the center of each cylinder cover, and a plurality of grooves are formed in the groove body. A collecting shell is arranged in the groove body and the shaft hole, an annular groove is formed in the inner side face of the cylinder cover, a ring body is movably arranged in the annular groove, the two ends of the second filter plate are installed on the ring body, and a driving mechanism for driving the ring body to rotate is installed on the cylinder cover. The powder coating filtering device is simple in structure, filtering can be rapidly conducted through combination of the first filtering plate and the second filtering plate, along with rising of the second filtering plate, powder coating can be filtered, metal impurities are intercepted, after the second filtering net rotates to a certain angle, the metal impurities can automatically slide into the collecting shell along the inclined second filtering plate, and the powder coating filtering device is convenient to use. And impurities can be conveniently collected.

The invention relates to the technical field of functional ceramic products, in particular to original degerming and moisturizing functional ceramic and a preparation method and a use method thereof.The functional ceramic is formed by firing natural mineral argil, and the natural mineral argil is naturally enriched with at least two trace metal elements of iron, copper, zinc and manganese needed by human metabolism; the porosity of the body of the functional ceramic is 15-30%, and the functional ceramic is used in cooperation with food to be heated in a microwave oven heating scene. According to the invention, natural mineral argil is taken as a raw material, and through structural design and process optimization, triple functions of moisturizing, nutrition supplement and sterilization in a microwave oven heating scene are realized, so that the core pain point of food moisture loss is solved, trace elements required by a human body are safely supplemented, and meanwhile, the safety of food after heating can be improved; the product is stable in preparation process and convenient to use, and has high practical value and market prospect.

The application provides a preparation method of a sodium-ion battery multi-element precursor and a positive electrode material from laterite nickel ore. The preparation method directly converts the laterite nickel ore into a jarosite precipitate and a nickel solution containing multiple trace metals, and then synthesizes a multi-element high-nickel precursor from the nickel solution through a coprecipitation process. Finally, the jarosite and the precursor are mixed and sintered to prepare the positive electrode material of the sodium-ion battery. The preparation method directly converts the mineral resources into the positive electrode material, greatly shortens the production process, and reduces the production cost, thereby providing a good reference for the preparation of the sodium-ion battery multi-element precursor and the positive electrode material. Meanwhile, the preparation method can control the residual amount of impurity metal elements in the raw materials in a targeted manner, so as to achieve in-situ doping in the preparation process of the precursor. The effective utilization of all metals in the laterite nickel ore is realized, the economic value of the resources is improved, and the raw material loss is reduced. The positive electrode material exhibits excellent electrochemical performance and has a good commercial prospect.

The embodiment of the application provides an electrolytic water hydrogen production metal component ion elution evaluation device and a test method, in the scheme, the communication state of different pipelines can be adjusted through the adapter and other structures, so that the test under different combination conditions is simulated; the ion purification part is used for reducing the metal ion concentration in the solution and collecting trace metal ions eluted in the test process, so that the corrosion behavior of the metal part, the influence degree of the impurity ions and the resin consumption demand of the purification are provided. Therefore, the scheme can perform multi-working condition coupling test on the metal part, simulate various working conditions in the real service environment of the acid / alkali hydrogen production, and make the evaluation test result more matched with the real service environment. Combined with ion purification and collection, more valuable guidance can be provided for actual industrial application. Moreover, the scheme avoids the problems of difficult data correlation, calculation, many interference factors and complicated operation when multiple devices are used for test.

The invention discloses a pretreatment method for trace metal impurity detection of a high-purity electronic-grade silicon-based precursor material. The method comprises the following steps: heating and volatilizing a liquid sample in an ultrapure PTFE / PFA beaker, and redissolving by using an electronic-grade inorganic acid-organic acid composite acid system; uniform heating is achieved through a special heating plate, pretreatment volatile organic waste gas is treated in cooperation with a hundred-grade dust-free environment, a clean operation table and a tail gas condensation and collection system, meanwhile, metal impurity concentration of different degrees can be achieved through the proportion of the use amount of a pretreatment sample to the use amount of redissolved inorganic acid, the detection limit is effectively reduced to 1-5 ppt, and the detection efficiency is improved. The recovery rate of the metal impurity detection pretreatment method reaches 85%-115%. The method breaks through the defects of long pretreatment time, silicon and carbon residues, metal loss caused by severe pretreatment reaction and the like of a traditional hydrolysis and digestion method, the treatment time is shortened to 2-4 hours, the G4 / G5 level (single metal 1t, 10ppt) detection requirement is effectively met, and a high-sensitivity and low-background-interference detection scheme is provided for impurity management and control of a high-purity silicon-based precursor in an advanced process.

The application discloses a method for high-selectivity recovery of beryllium from lithium smelting beryllium-containing clinker, and belongs to the technical field of beryllium-containing solid waste resource utilization. After the lithium smelting beryllium-containing clinker is crushed, slurry is prepared, and under the shearing action, concentrated acid is slowly added dropwise to the slurry to precisely control the pH of the slurry in the range of 3.0-3.5 to perform reaction. After the reaction is completed, solid-liquid separation is performed to obtain beryllium-containing filtrate. The beryllium-containing filtrate is subjected to precipitation by using a sodium hydroxide solution to precisely control the end-point pH of the beryllium-containing filtrate in the range of 8.5-9.0, and a composite precipitate containing beryllium hydroxide and potassium sodium cryolite is obtained. The method completely breaks the traditional situation of 'waste production waste', not only realizes efficient separation of the highly toxic beryllium, but also directly converts the beryllium-containing solid waste into 'rich beryllium potassium sodium cryolite composite concentrate' with a main phase of crystalline potassium sodium cryolite and a beryllium grade of more than 5.5%, realizing double high-value extraction of trace metals (beryllium) and bulk minerals (cryolite).

The present invention relates to a polycrystalline diamond composite sheet vacuum packaging flow blocker and flow blocker structure, so that the molten solder liquid or metal gas inside the metal cup is blocked by the flow blocker and stays in the space between the metal cap cup and the flow blocker, and does not enter the polycrystalline diamond composite sheet synthesis area. The polycrystalline diamond micropowder and the alloy matrix are not affected by the molten solder liquid and trace metal gas in the flow blocker, and are in a vacuum sealed environment, so that the molten solder liquid and the trace metal gas generated by the solder during melting are prevented from flowing and diffusing to the polycrystalline diamond composite sheet synthesis area, thereby improving the stability and yield rate of the polycrystalline diamond composite sheet.

The invention discloses a pretreatment method for measuring trace metal elements in high-purity titanium, which comprises the following steps: reacting titanium with concentrated nitric acid at 70 DEG C or above to generate titanic acid, then adding a barium chloride solution to react with titanic acid to generate barium titanate precipitate, and carrying out constant volume and centrifugation to obtain a pretreatment solution without titanium elements; the specific method comprises the following steps: (1) cutting high-purity titanium; (2) dissolving high-purity titanium; (3) titanic acid precipitation; and (4) centrifuging. According to the method, titanium is oxidized to generate titanic acid, then barium salt reacts with the titanic acid to generate barium titanate precipitate, and the titanium element in the detection solution is removed, so that the interference of the titanium element in ICP-MS (Inductively Coupled Plasma Mass Spectrometry) analysis is eliminated. The method is suitable for measuring trace impurity metal elements in high-purity titanium.

The present application provides a kind of detection method of ash in asphalt.The detection method includes: step S1: raw materials including asphalt and dispersant are heated and mixed in sequence to obtain melt;Step S2: melt is crystallized to obtain asphaltene crystal;Crystallization treatment includes temperature drop and isothermal crystallization treatment in sequence;The temperature drop rate of temperature drop is ≤5℃ / min;Step S3: asphaltene crystal is phase separated to obtain crystalline phase;Step S4: crystalline phase is ashed to obtain ash;The temperature of ashing treatment is ≤200℃;Step S5: ash is detected to obtain the composition and mass content of ash.The detection method of the present application can realize efficient enrichment of ash and very low background interference, can detect most of the trace metal elements in ash, and has good accuracy and repeatability, thereby better meeting the quantitative detection needs of high-quality asphalt for very low ash content.

The invention belongs to the technical field of target materials, and discloses a doped nickel oxide-based target material as well as a preparation method and application thereof. The doped nickel oxide-based target material comprises the following raw material components: nickel oxide, lithium oxide and other metal oxides, wherein the other metal oxides are selected from at least one of copper oxide, cobalt oxide and silver oxide. The doped nickel oxide-based target material prepared by the invention can be used for RPD coating and evaporation coating, and the grain structure of the nickel oxide-based evaporation target material is improved and the carrier concentration and mobility of the thin film are improved in a lithium oxide doping manner and other specific trace metal oxides, so that the hole conductivity of the nickel oxide-based thin film is improved.

The invention relates to the technical field of hard alloy materials, in particular to an alloy solid solution, a preparation method, hard alloy and application. The alloy solid solution is prepared from the following raw materials in parts by weight: 15 to 17 parts of tantalum oxide, 15 to 30 parts of titanium carbonitride, 45 to 60 parts of tungsten carbide, 1 to 4 parts of carbon black, 5 to 10 parts of cobalt, 0.1 to 0.7 part of chromium nitride, 0.01 to 0.1 part of trace metal and 0.001 to 0.003 part of rare earth; the trace metal comprises at least one of indium, tin and copper sources. The alloy solid solution provided by the invention is prepared from tantalum oxide, titanium carbonitride, tungsten carbide, carbon black, cobalt and chromium nitride, and has the advantages of high purity, good toughness, high hardness, wear resistance, high temperature resistance and the like.

The invention relates to the technical field of metal content determination, in particular to a method and equipment for determining the content of trace metal in micro-powder lithium carbonate, and the method comprises the following steps: screening out a characteristic wavelength from all specific wavelengths of each to-be-determined trace metal element based on wavelength difference and spectral intensity difference between different specific wavelengths; analyzing the wavelength difference and the spectral intensity difference between each non-specific wavelength and all other non-specific wavelengths, counting the frequency of the spectral intensity corresponding to each non-specific wavelength in the spectrum, and determining the baseline interference degree to screen the baseline interference wavelength; and correcting the spectral intensity based on the spectral intensity and the baseline interference degree of all the baseline interference wavelengths so as to measure the content of each trace metal element to be measured in the micro-powder lithium carbonate. According to the method, by screening the characteristic wavelength and adaptively deducting the background noise, the accuracy and reliability of measuring the content of the trace metal in the micro-powder lithium carbonate are improved.

The application relates to a preparation method of high-purity chromium powder for a target material, comprising the following steps: (1) performing electron beam melting treatment on pretreated electrolytic chromium sheet to obtain a chromium ingot; removing both ends of the chromium ingot to obtain a high-purity chromium ingot; the electron beam melting treatment comprises gradient temperature rising treatment, refining treatment and directional solidification treatment; (2) performing ball milling treatment and screening treatment on the high-purity chromium ingot to obtain the high-purity chromium powder. Through the electron beam melting technology and a multi-section electron beam power control strategy, the application realizes accurate regulation and control of the temperature of a molten pool and refining kinetics. The preparation method can not only efficiently remove conventional metal impurities with a vapor pressure significantly higher than that of chromium, but also promote the diffusion and selective removal of trace metal impurities with a vapor pressure similar to that of chromium, so that the limit of the original purification method is broken through.

This invention relates to a composite calcium oxide slag based on furnace lining adsorption and its application, belonging to the field of protective slag technology. The composite calcium oxide slag of this invention comprises the following raw materials in parts by weight: CaO 48-52 parts, Al2O3 35-40 parts, MgO 5-8 parts, and metallic aluminum powder 1-3 parts. The raw materials are pre-melted and mixed to obtain the composite calcium oxide slag. Before pre-melting and mixing, alumina and metallic aluminum powder are ball-milled, and the aluminum powder is embedded in the alumina matrix in the form of nanocrystals, improving the stability of the composite calcium oxide slag. By utilizing the trace amounts of metallic aluminum pre-embedded in the slag, a rough structure is generated in situ on the surface of the magnesium-aluminum spinel furnace lining, thereby enhancing the mechanical anchoring and chemical adsorption of the dynamic reaction film, reducing the film formation temperature, and greatly increasing the film coverage.

A process for producing high purity alumina (HPA) or high purity aluminium salts from an aluminium-bearing material, such as is disclosed. An aluminium-bearing solution is first obtained by either dissolving or leaching the aluminium-bearing material. Aluminium is then selectively extracted by liquid-liquid or liquid-solid extraction to obtain an aluminium-enriched liquid or aluminium-enriched solid phase. Minor metal impurities still remaining in the aluminium-enriched liquid or solid phase are removed by scrubbing the aluminium-enriched liquid or aluminium-loaded ion exchange resin with an aqueous solution thereby producing a metal impurity-depleted aluminium-enriched liquid or metal impurity-depleted aluminium enriched solid phase. Aluminium is then stripped from the scrubbed liquid or solid phases with an acidic aqueous solution to produce an aluminium-enriched aqueous solution. High purity aluminium salts may be crystallised from said solution. Alternatively, the pH of said solution may be raised to precipitate an aluminium precipitate, such as Al(OH)3, which is then calcined to produce HPA.

The invention provides a trace metal modified perovskite oxide, a catalyst and a method, the trace metal modified perovskite oxide comprises a LaMO3 type perovskite oxide substrate, a vulcanization layer and a trace metal modification layer, the vulcanization layer and the trace metal modification layer are sequentially arranged on the surface of the LaMO3 type perovskite oxide substrate, and M is non-noble metal. On the basis of considering economy and performance, the catalytic performance of the perovskite oxide is improved, so that the application of the perovskite oxide in electrochemical reaction is promoted, and commercial application requirements are met.