226 results about "Iron metal" patented technology

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method and application thereof. The method comprises the following steps: mixing manganese metal and iron metal, heating, melting and uniformly mixing in an inert gas atmosphere, and grinding into powder; adding an ammonium salt solution, continuously adding the ground manganese-iron alloy powder under heating to form a suspension, introducing compressed air and stirring, reacting, filtering, washing, drying, crushing and grinding to obtain a manganese-iron oxide precursor, feeding the manganese-iron oxide precursor, a lithium source, a phosphorus source and doped metal elements into pure water, adding a carbon source, mixing to form a suspension, and grinding and drying to obtain the lithium-phosphorus-doped manganese-iron composite material. And carrying out carbon thermal reduction in an inert gas atmosphere, and crushing to obtain the lithium manganese iron phosphate positive electrode material. The ferromanganese oxide precursor prepared by heating the metal manganese and the metal iron to a molten state and mixing the metal manganese and the metal iron realizes uniform dispersion of the manganese and the iron at an atomic level, avoids the problems of nonuniform mixing of the manganese and the iron and dissolution of the manganese, and improves the conductivity and the electrochemical performance of the material.

The utility model relates to the technical field of cutting fluid recovery, and discloses a cutting fluid recovery device for metal cutting machining, which comprises a recovery outer barrel, a recovery inner barrel is clamped in the recovery outer barrel through a rotating disc, and a first motor is arranged at the lower end of the recovery outer barrel. The output end of the first motor is fixedly connected with a rotating disc in the recycling outer cylinder through a rotating shaft. A treatment box is fixedly arranged at the lower end of the recycling outer cylinder, and a liquid inlet pipe penetrates through the lower end of the recycling outer cylinder. According to the cutting fluid recycling device for metal cutting machining, fine iron metal and the like contained in cutting fluid can be adsorbed through the adsorption magnetic roller, pipeline blockage or influence on the use effect of the cutting fluid due to circulation of the cutting fluid is avoided, fine scraps attached to the surface of the adsorption magnetic roller can be cleaned through the discharging plate, and the cutting fluid recycling device is convenient to use and high in practicability. And the continuous adsorption effect of the adsorption magnetic roller is guaranteed, then the waste scraps can be pushed to the two sides of the treatment box through movement of the reciprocating scraper, and the purpose of automatically cleaning the interior of the treatment box is achieved.

The invention relates to a porphyrin-based iron metal organic framework (Fe-TCPP) catalyst for improving photoresponsiveness, which is characterized in that the Fe-TCPP nano catalyst is prepared by using an iron source and meso-tetra (4-carboxyphenyl) porphin (TCPP) as precursors through a simple solvothermal method, assisting coordination by virtue of polyvinylpyrrolidone (PVP), performing sealed reaction after ultrasonic dispersion, and preparing the Fe-TCPP nano catalyst. A purple suspension is obtained. And centrifuging, washing and drying to obtain the nano rod-shaped Fe-TCPP metal organic framework material. The Fe-TCPP catalyst prepared by the preparation method disclosed by the invention has a regular crystal structure and good dispersity, and can be stably coordinated to form a Fe-O cluster structure. The effective introduction of the TCPP enhances the charge transfer (LCCT) capability from the ligand to the metal cluster, effectively promotes the Fe (III) / Fe (II) circulation, and improves the photocatalysis-ozonation catalytic efficiency. The catalyst has the advantages of high thermal stability, less metal ion dissolution, good cycle performance and the like, and has wide application potential in the field of water treatment.

This invention relates to a defect-laden porous carbon support for a stable iron-based diatomic catalyst, its preparation method, and its application in air batteries, belonging to the field of catalyst preparation technology. The preparation method involves the following steps: ZIF-8 is subjected to high-temperature heat treatment under a nitrogen atmosphere, followed by rapid cooling under a liquid nitrogen atmosphere; then mixed with an iron metal source, and ethanol is added for defect backfilling. After stirring and drying, a second heating is performed to obtain the catalyst. This method can firmly and precisely anchor two metal atoms onto the carbon support, ensuring the formation of stable diatomic sites and their full exposure. This ensures that the active sites are in full contact with the substrate to exert their efficient catalytic effect, avoiding particle agglomeration that could lead to clusters or metal particle formation, causing some sites to be encapsulated and hindering their high activity. This method can be effectively applied in air batteries.

The invention belongs to the technical field of electrode materials, and particularly discloses a self-supporting electrolyzed water catalytic electrode material, a preparation method and application thereof, the self-supporting electrolyzed water catalytic electrode material comprises a foamed nickel-molybdenum alloy as a substrate, and the surface of the foamed nickel-molybdenum alloy is covered with a two-dimensional layered nickel-iron metal hydroxide. The nickel-molybdenum alloy self-supporting nickel-iron double-metal hydroxide obtained by the technology is used as a bifunctional catalyst for hydrogen evolution and oxygen evolution reaction in a non-acidic medium. The foamed nickel-molybdenum alloy is used as a raw material of a current collector and a catalytic active site at the same time, a fresh crystal nucleus is formed on the surface of the foamed nickel-molybdenum alloy through one-step ferric ion etching, then the foamed nickel-molybdenum alloy is placed in air, and the catalytic activity of the nickel-molybdenum alloy is improved under the combined action of water and oxygen. The nickel element from the foamed nickel-molybdenum alloy and the adsorbed iron element spontaneously grow on the surface of the nickel-molybdenum alloy to form the layered double-metal hydroxide nanosheet.

The invention provides an iron metal oxyhydroxide catalyst, a preparation method thereof and application of the iron metal oxyhydroxide catalyst in urea electrosynthesis, and belongs to the technical field of electrocatalysis, the iron metal oxyhydroxide catalyst comprises a stainless steel mesh substrate and a FeOOH layer coating the surface of the stainless steel mesh substrate; wherein the stainless steel mesh substrate is subjected to diluted hydrochloric acid soaking ultrasonic pretreatment. The iron metal oxyhydroxide catalyst with a polarized Fe0-Fe3 + structure is prepared by taking a stainless steel mesh pretreated by diluted hydrochloric acid as a substrate through an electrochemical deposition process. The catalyst has high C-N coupling selectivity and good cycling stability in a urea electro-catalysis synthesis reaction.

The invention discloses a composition containing a honeysuckle extract, a tablet and a production method thereof, and belongs to the technical field of medicines.The preparation method comprises the steps that pseudo-ginseng, honeysuckle and radix isatidis are dried and ground into powder, a hydrogel film coating with an environmental response function is prepared, and the hydrogel film coating has porosity and environmental tolerance, can improve the slow release performance of a medicine, and has a good application prospect. The active ingredient preservation time of the medicine is protected, and the medicine effect is prolonged; according to the hydrogel film coating, natural plant-derived polysaccharide and microcrystalline cellulose with excellent biocompatibility are used as raw materials, the raw materials are subjected to swelling treatment and then grafted with a polyethylene glycol-maleic anhydride copolymer, then an iron metal framework sensitive to the pH value is subjected to hydrothermal synthesis on the surface, the iron metal framework serves as a crosslinking center, a hydrogel film structure is generated through crosslinking to serve as the coating, and the hydrogel film coating is prepared. Therefore, the permeation resistance and mechanical strength of the coating are balanced, the swelling rate difference is avoided, the structural stability of the coating is guaranteed, and the tablet prepared from the coating can be used for treating cold and has a good drug effect.

The invention discloses a method for removing organic pollutants in a water body by activating persulfate with an alkali-modified copper-iron bimetallic catalyst, which is characterized in that the alkali-modified copper-iron bimetallic catalyst is used as a catalyst for activating the persulfate and degrading the organic pollutants in the water body. Wherein the alkali modified copper-iron bimetallic catalyst comprises a copper-iron metal compound (CuFeO2) and oxygen vacancies loaded on the copper-iron metal compound. The catalyst disclosed by the invention has the advantages of large specific surface area, large number of active sites, high catalytic activity, good structural stability and the like, can construct a core mechanism degradation system based on a non-free radical pathway when being used for activating persulfate, can more quickly and thoroughly remove organic pollutants in water when being used for degrading the organic pollutants in the water, and has a good application prospect. The method has the advantages of simple process, convenience in operation, low cost, high practicability, wide application range, high treatment efficiency, good degradation effect, environment friendliness and the like, and is high in use value and good in application prospect.

The invention belongs to the technical field of electrochemical luminescence analysis and detection, and relates to an electrochemical luminescence sensor of a defective iron metal organic framework enhanced pyrenyl self-assembled hydrogen bond organic framework, and a preparation method and application thereof. Comprising the following steps: dispensing a PSA-HOF / Pca-MIL-88B (Fe) dispersion liquid on a GCE electrode, drying, dropwise adding a perfluorooctanoic acid aptamer, reacting at room temperature to finally obtain an aptamer modified PSA-HOF / Pca-MIL-88B (Fe) electrode as a working electrode, Ag / AgCl as a reference electrode and a Pt electrode as a counter electrode, and introducing the aptamer modified PSA-HOF / Pca-MIL-88B (Fe) electrode, Ag / AgCl as a reference electrode and a Pt electrode as a counter electrode into a PBS phosphate buffer solution containing potassium persulfate for detecting perfluorooctanoic acid. The prepared PSA-HOF / Pca-MIL-88B (Fe) system electrochemical luminescence sensor has the characteristics of simplicity, convenience and flexibility in operation, wide detection range, low detection limit, low detection cost and the like.

Embodiments of the present disclosure describe metal organic framework (MOF)-like composite material (MOFite) including a salicylaldehydate-based iron metal organic framework composition and graphite, a lithium-ion battery including a cathode and an anode including a salicylaldehydate-based iron metal organic framework composition and graphite, and a scalable synthesis methods for salicylaldehydate-based metal-organic frameworks (SA-MOFs), specifically Fe-Tp, and their applications in lithium-ion batteries (LIBs).

The present invention generally relates to electrochemical energy storage and battery technology. Specifically, the present invention relates to bifunctional electrocatalyst for metal-air electrochemical device. More particularly, the present invention relates to Nickel-Iron metal¬ organic framework (NF-MOF) as bifunctional electrocatalyst for zinc-air battery application. Further, the present invention relates to synthesis of Nickel-Iron metal-organic framework (NF- MOF) by refluxing method.

This invention relates to the field of catalyst technology, specifically to an iron-based catalyst, its preparation method and application, and the FTO reaction. The catalyst comprises a support and an active component. The active component, expressed as an oxide, has the following general chemical formula: Fe 100 Mn a Nb b Cs c A d B e O x A is selected from Group VIII nonferrous metals and / or Group VIB elements; B is selected from La series elements; the value of a ranges from 30.0 to 130.0; the value of b ranges from 1.0 to 20.0; the value of c ranges from 0.1 to 10.0; the value of d ranges from 1.0 to 60.0; the value of e ranges from 0.1 to 10.0; x is the total number of oxygen atoms required to satisfy the oxidation states of each element in the catalyst. The iron-based catalyst of this invention exhibits excellent resistance to carbon deposition during use, and when used in the FTO reaction, it can achieve high CO feedstock conversion and C2-C4 olefin selectivity.

The utility model discloses classified screening equipment for waste metal recovery, which comprises an operation table, a mounting frame is arranged on the upper portion of the operation table and fixedly connected with the operation table, a mounting plate is arranged on the side face of the mounting frame, and a collecting box is arranged on the surface of the mounting plate. A driving shaft is arranged on the inner side of the mounting frame, a driving roller is arranged on the surface of the driving shaft, and a magnetic attraction belt is arranged on the surface of the driving roller. Waste metal needing to be screened is guided into the material box, discharged through the discharging port and conveyed to the lower portion of the magnetic attraction belt through the conveying belt, the motor drives the driving shaft to rotate, so that the magnetic attraction belt rotates along with the driving shaft, the magnetic attraction belt adsorbs iron-containing metal and iron products and conveys the iron-containing metal and the iron products to the upper portion through rotation, and the iron-containing metal and the iron products are separated from each other. By means of the device, continuous operation can be achieved, and the screening efficiency is greatly improved.

This invention relates to iron single-atom composite catalysts with a double-layered carbon dot core-carbon-nitrogen shell structure and their applications. The catalyst preparation method is as follows: carbon source, nitrogen source, and iron metal salt are dispersed in a mixed solution of solvent and coordinating agent and stirred evenly, followed by hydrothermal reaction; after the reaction, the supernatant is filtered and dialyzed, and the dialysate is freeze-dried to obtain Fe. SA / CDs material; add zinc nitrate hexahydrate and iron metal salt to deionized water, add Fe SA / CDs aqueous solution, then add the solution of 2-methylimidazole completely dissolved in deionized water, ultrasonically stir, and after the reaction, obtain Fe. SA / CDs / Fe@ZIF-8 precursor; the precursor was subjected to Joule heat treatment and cooled to room temperature to obtain an iron single-atom composite catalyst with a bilayer carbon dot core-carbon-nitrogen shell structure. This invention effectively improves the catalytic activity and stability of the catalyst in the benzaldehyde oxidative nitrification reaction.

The application discloses a metal waste sorting and recycling device for an automobile accessory processing plant, and relates to the technical field of metal waste recycling.The device comprises an H-shaped base, a conveying belt for conveying metal waste is arranged above the inside of the H-shaped base, an adsorption and recycling mechanism is arranged on the upper portion of the H-shaped base, a limiting plate is arranged on one side of the adsorption and recycling mechanism on the upper portion of each side of the H-shaped base, a limiting groove is arranged on one side of each limiting plate, a scraping mechanism is arranged to slide transversely between the limiting grooves on the two limiting plates, and a collecting mechanism is arranged inside the lower portion of the H-shaped base.The metal waste sorting and recycling device for the automobile accessory processing plant drives the scraping rod to move horizontally and linearly through the linkage mechanism, and uniformly scrapes the accumulated waste on the conveying belt.This design effectively solves the problem of waste accumulation, ensures the uniform distribution of the waste on the conveying belt, and improves the adsorption effect of the electromagnet sleeve on the iron metal.

The invention discloses a method, equipment and system for measuring the thickness of an inner wall coating of material processing equipment, and relates to the technical field of ultrasonic measurement. According to the method, an ultrasonic sensor located on the outer wall of the material processing equipment is controlled to emit an ultrasonic signal, a target signal is received through the ultrasonic sensor, and the target signal comprises a first echo signal formed through reflection of an interface of a coating and a material in the material processing equipment and a second echo signal formed through reflection of the material. According to the method, based on a target signal and an ultrasonic signal, the first transmission duration of the ultrasonic signal reaching a first interface is determined, and then the thickness of the coating is determined based on the first transmission duration and the first transmission speed of the ultrasonic signal in the coating. The thickness of the coating on the inner wall of the material treatment equipment can be measured outside the material treatment equipment, so that the material treatment equipment does not need to be disassembled, iron metal foreign matters cannot be introduced into the material, and the influence of the coating thickness measurement process on the purity of the material can be avoided.

The present invention provides an organic framework derivative phototherapeutic agent containing ruthenium and iron metal atoms for photothermal and photodynamic therapy, and a preparation method and application thereof. The preparation method of the phototherapeutic agent of the present invention includes the steps of: dissolving an iron salt, a ruthenium salt, a zinc salt and 2-methylimidazole in a solvent, stirring and reacting, and then centrifuging, washing and freeze-drying to obtain a precursor; the precursor is calcined to obtain the phototherapeutic agent. The phototherapeutic agent of the present invention has good structural stability, photothermal conversion characteristics and photosensitivity; not only has the property of converting light energy into heat energy, but also has the photosensitive property of converting light energy into kinetic energy and then generating reactive oxygen species; it can be effectively used for photothermal therapy and photodynamic therapy, and thus can be used as a phototherapeutic agent for the treatment of tumor cells.

The application discloses a kind of material processing equipment inner wall coating thickness measurement method, thickness measuring equipment and system, it is related to ultrasonic measurement technical field.The method controls the ultrasonic sensor located on the outer wall of material processing equipment to emit ultrasonic signal, and target signal is received by the ultrasonic sensor, the target signal includes the first echo signal formed by the interface reflection of coating and material in material processing equipment, and the second echo signal formed by the reflection of material.The method determines the first transmission time length of ultrasonic signal to the first interface based on the target signal and the ultrasonic signal, and then determines the thickness of coating based on the first transmission time length and the first transmission speed of ultrasonic signal in coating.Because the thickness of coating in the inner wall of material processing equipment can be measured outside material processing equipment, it is not necessary to disassemble material processing equipment, and iron metal foreign matter is not introduced into material, so that the purity of material can be avoided during the measurement process of coating thickness.

The invention relates to a rust accelerator that is present as a one-component rust accelerator or as a two-component rust accelerator, comprising as component (a) one or more aliphatic carboxylic acids or carboxylic acid esters in a total amount of 0.5 to 6 parts by weight, as component (b) one or more alkali halides or ammonium chloride in a total amount of 0.002 to 0.5 parts by weight, and as component (c) at least one hydrogen peroxide compound in an amount of 2.0 to 150 parts by weight. The invention also relates to a process for the oxidation of iron-containing metals using the rust accelerator according to the invention.

The present invention relates to an alkaline water electrolysis oxygen evolution electrode and its preparation method and application. The preparation method comprises: in a two-electrode system, using a nickel-iron metal salt aqueous solution as an electroplating solution, a commercial nickel mesh as an anode, and an electro-etched nickel mesh as a cathode; energizing the electrodes so that the surface of the commercial nickel mesh at the anode undergoes electro-etching, and the surface of the electro-etched nickel mesh at the cathode undergoes electrodeposition; removing the electroded cathode as a finished electrode and replacing it with a new commercial nickel mesh, while leaving the anode unchanged; then reversing the current direction, reversing the electrodes, and repeating the electro-etching and electrodeposition cycles, thereby achieving continuous production of the alkaline water electrolysis oxygen evolution electrode. Compared with the prior art, the preparation method of the present invention is far superior to existing electrode preparation technologies in terms of preparation simplicity, economy, catalytic performance, and service life, greatly improving the economic benefits of industrial water electrolysis.

The invention discloses a centrifugal production method of a bimetallic wear-resistant pipe, which is applied to the field of centrifugal casting. The method comprises the following steps: 1) preparing a self-propagating pipe, wherein the thickness of a self-propagating layer is 1-2mm; (2) the self-propagating pipe is installed in the pipe mold, and the center lines of the two are consistent; 3) heating the self-propagating pipe: heating the self-propagating pipe by adopting a heating furnace, a gas pipe, an electric heating piece, an induction coil and the like; (4) pouring the molten metal: pouring the high-chromium cast iron molten metal when the temperature of the self-propagating pipe is 200-600 DEG C, and (5) cooling and demolding: cooling and demolding after the high-chromium cast iron molten metal is solidified to form the bimetallic wear-resisting pipe. According to the bimetallic wear-resisting pipe produced by the method, the wear-resisting layer is 5 mm thinnest, the product blank of 5-10 mm of the wear-resisting layer which is centrifugally poured is filled, and the wear-resisting layer is free of cracks and long in service life.

The invention relates to a color developing solution for detecting iron metal foreign matters in a lithium battery production process and a detection method, and the color developing solution comprises the following components in parts by volume: 3-4 parts of an acid solution, 1-2 parts of an oxidizing agent and 3-4 parts of a thiocyanate solution. The color developing solution is provided for detection of the iron metal foreign matter in the lithium battery production process, the iron metal foreign matter in the lithium battery production process is rapidly and qualitatively detected by utilizing a color developing reaction of ferric ions and thiocyanate ions to generate a blood red complex iron thiocyanate, and the detection sensitivity, the detection efficiency and the speed are high; the reagent of the color developing solution is nontoxic and harmless, the cost is low, the color developing solution is particularly suitable for large-batch detection on a mass production line, the detection efficiency of the production line is greatly improved, and meanwhile, high detection sensitivity is taken into account.

Provided herein is a use of an aqueous slurry or powder composition, a method for marking an object made of a steel, metal or non-ferrous metal alloy, the method comprising the step of applying a powder or aqueous slurry to the object to provide a mark, and a marked object obtained thereby, the powder or aqueous slurry comprises: A, an aluminum compound other than aluminum titanate and aluminum nitride, preferably comprising one or more selected from the group consisting of aluminum oxide and aluminum hydroxide; and B is one or more particles selected from the group consisting of oxides, hydroxides, carbides, nitrides, aluminates and titanates of aluminum titanate, aluminum nitride, and metals or semimetals other than aluminum. The marking can be provided on an object made of, for example, steel or other metal or metal alloy, is durable even at high temperatures, but can be removed by a simple physical operation, for example, scrubbing or wiping, without compromising the nature or size of the marked object.

The invention relates to the field of production measurement, and provides a touch control type intelligent sofa production device based on mobile phone terminal Bluetooth control, which is characterized by comprising a base, a sliding block, an electric appliance box, a detection plate and a box driving assembly, the sliding block is slidably connected to the top wall of the base, the electric appliance box is fixedly connected to the top wall of the sliding block, and a distance measuring sensor is embedded in the left wall of the electric appliance box; the bottom wall of the electric appliance box is fixedly connected with a second cylinder, a piston rod fixedly connected with the second cylinder is fixedly connected with a clamping block, the bottom wall of the electric appliance box is rotationally connected with a pressing wheel, the box driving assembly is connected to the base and connected with the electric appliance box, the detection plate is rotationally connected to the top wall of the base, and a workpiece groove is formed in the top wall of the detection plate; the bottom wall of the workpiece groove communicates with the bottom wall of the detection plate through the workpiece outlet channel and is provided with an iron rod groove, and the inner wall of the iron rod groove is provided with an inclined face. According to the invention, the length of the plurality of iron-containing metal bone rods is detected through the distance measuring sensor, the error degree is small, and the iron-containing metal bone rods with unqualified lengths are recycled.

A low heat, electrochemical cascade process generates iron metal (Fe2) from iron ore and a sequence of alkaline electrolytic solutions. An intermediate phase favors iron oxide in a layered double hydroxide (LDH) form resulting from conditioning silicates in the alkaline solution over chemically inert Fe3O4 formation. The alkaline electrolytic solution mitigates production of hydrogen gas over acidic approaches by inhibiting a hydrogen evolution reaction (HER) that forms parasitic hydrogen gas. An electrolyte containment generates an electrolyte flow for the cascading electrochemical reaction as the raw iron oxide transforms to iron metal while avoiding conventional shortcomings of low value products of Fe3O4 (magnetite) and hydrogen gas, and instead favors generation of iron metal. Additional electrolyte salts can further form iron alloys.

The invention discloses a preparation method of a metal-supported aluminum-based catalyst and application of the metal-supported aluminum-based catalyst in nitrification wastewater treatment.The catalyst takes an aluminum source as a carrier, zinc-niobium-iron metal as an active component and cucurbituril as a modifier and has the advantages of being good in adsorption effect and high in reaction efficiency. By combining with the nitrification wastewater treatment method provided by the invention, the recycling rate of dinitrotoluene can be effectively increased, the total nitrophenol content and COD content in the nitrification wastewater can be remarkably reduced, the blockage problem caused by separation of ammonium bicarbonate from equipment pipelines is solved, and the method has the advantages of high recycling rate, good treatment effect and long operation period.

The invention discloses metal material recovery vacuum purification equipment, and relates to the technical field of metal material recovery, the metal material recovery vacuum purification equipment comprises a shell, a material guide pipe is fixedly mounted at the bottom of the shell, sliding grooves are formed in the two sides of the material guide pipe, material blocking parts are slidably mounted in the sliding grooves, and a heating barrel is fixedly mounted at the bottom of the material guide pipe; a magnetic separation mechanism is installed at the axis of an inner cavity of the shell, and a material distribution mechanism is installed at the bottom of the inner cavity of the shell. According to the metal material recovery vacuum purification equipment, iron-containing metal and non-magnetic impurities are separated through the magnetic separation mechanism, the non-magnetic impurities in raw materials are effectively removed, the impurities are prevented from influencing the heating purification effect, the purity of the raw materials is improved, a vacuum pipe in the heating barrel is connected with a vacuum pump to extract air in the barrel to form a vacuum environment, and metal oxidation is avoided; meanwhile, the metal boiling point is greatly reduced, and metal is efficiently purified.

The structure is simplified, and the molten metal flows more smoothly, allowing for efficient dissolution and heating. [Solution] The furnace body 10 has heating chambers 12 and 13 that communicate with an input port 11 for non-ferrous metal materials, and a tapping chamber 14 that can receive a portion of the molten metal heated to a predetermined temperature in the heating chambers 12 and 13 and from which the molten metal can be removed, and a rotating blade 20 for circulation that is provided in the center of the heating chambers 12 and 13 to circulate the molten metal, and a plurality of electric heaters 30 and 40 provided in the heating chambers 12 and 13 to raise the molten metal to a predetermined temperature.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one clay matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 1 m² / g and less than 50 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The application discloses a preparation method of homogeneous poly-methacrylimide wave-absorbing foam, and belongs to the technical field of functional foam materials. Thermally expandable microspheres are used as carriers, and iron metal framework structures with 5-hydroxy isophthalic acid as monomers are loaded on the surfaces of the carriers to obtain dispersed thermally expandable microspheres, which can be uniformly dispersed in the wave-absorbing foam, realize uniform foaming, and have uniform foaming effect and insignificant layering phenomenon. Meanwhile, core-shell toughening composite powders generated by a molten salt method are used as fillers of the wave-absorbing foam, so that the impact resistance and performance stability of the wave-absorbing foam in the foaming process are effectively ensured. The strong covalence of Ti-B bonds in the shell of the core-shell toughening composite powders makes the core-shell toughening composite powders have high conductivity, can absorb electromagnetic wave energy through a dielectric loss mechanism, and the boron nitride of the core can assist in forming multiple scattering interfaces and prolonging the electromagnetic wave propagation path, so that the wave-absorbing performance of the absorbent is increased.