72 results about "Feroxyhyte" patented technology

The invention discloses a sodium alginate embedded iron-carbon microcapsule material for repairing cadmium and arsenic polluted soil and a preparation method of the sodium alginate embedded iron-carbon microcapsule material, and belongs to the technical field of soil heavy metal pollution repairing materials. The material comprises straw biochar, high-iron steel slag powder, a sulfydryl acetylated chitosan-iron monatomic cluster compound, a boron-doped graphitized carbon coated cobalt ferrite nanosheet, sodium alginate, calcium chloride and sodium carbonate. Wherein the sulfydryl acetylated chitosan is prepared by reacting chitosan with sulfydryl acetic anhydride, dialyzing and drying, and performing solvothermal reaction with ferric nitrate under high pressure. The preparation method comprises the following steps: pyrolyzing and drying the straw biochar, reacting the high-iron steel slag with sulfuric acid, adding the biochar, adjusting the pH value, adding sodium carbonate, mixing to obtain an iron-carbon-based passivation material, mixing with two modified compounds, mixing with a sodium alginate solution, dropwise adding a calcium chloride solution, and stirring and curing. The material can be applied to remediation of cadmium and arsenic polluted soil.

The invention discloses a method for extracting copper fine powder by flotation of copper-containing ore, which belongs to the technical field of mineral processing, and comprises the following steps: after copper-containing raw ore is crushed, ground and classified by a cyclone, overflow enters flotation, and settled sand is returned for regrinding; sodium carbonate is added into graded overflow to adjust the pH, a sodium hexametaphosphate-polyacrylamide composite dispersant is added, and copper sulfate is added and stirred after low-temperature microwave heating; gradient flotation is conducted, specifically, copper sulfide is roughly selected, the pH is adjusted, an amino-sulfonic acid group synergistic modified layered double metal hydroxide / cobalt ferrite composite collecting agent is added, and rough concentrate 1 is obtained through high-frequency pulse air inflation flotation; copper oxide roughing is conducted, clear water is supplemented to adjust the pH, and a collecting agent is supplemented to obtain rough concentrate 2; scavenging is performed for three times, a collecting agent is added for flotation, and concentrate returns to the previous stage; the rough concentrates are combined, and magnetic impurities are removed through high-gradient magnetic separation to obtain magnetic concentrates; and carrying out microbiological leaching on tailings to recover copper. The composite collecting agent is prepared through layered double hydroxide carrier synthesis, amino modification, sulfonic acid group grafting and cobalt ferrite anchoring.

The invention discloses a treatment method of strong complexing copper wastewater, which comprises the following steps: adjusting the pH value of the strong complexing copper wastewater, adding a complexing breaking agent, stirring and reacting until the color of the solution becomes brownish black, then adding ferric chloride for deep purification, and finally adjusting the pH value back for flocculating settling and solid-liquid separation. And finally, obtaining clear liquid with the effluent copper ion concentration stably lower than 0.5 mg / L and ferrite precipitate-sludge with stable chemical properties. The method is simple and low in cost, secondary pollution is avoided, the treatment difficulty and environmental risks of the strong complexing copper wastewater and the sludge obtained through treatment are greatly reduced, and the method has wide application prospects.

The application discloses a kind of microspheroidal high-entropy spinel type ferrite wave-absorbing materials and preparation method thereof, belong to electromagnetic wave absorbing material technical field, the preparation method includes with the designed molar ratio six metal nitrate is weighed and dissolved in deionized water, then add ammonium fluoride, urea, after stirring, the obtained solution is hydrothermal reaction at a certain temperature for a certain time to obtain precursor, the precursor is calcined to obtain microspheroidal high-entropy spinel type ferrite.The obtained wave-absorbing material is single-phase spinel structure, micron-sized spherical morphology, its chemical formula is MFe2O4;Wherein M=Co, Ni, Cu, Zn, Cr.The microspheroidal high-entropy spinel type ferrite wave-absorbing material and preparation method thereof are used, and the performance of pure ferrite wave-absorbing material can be effectively improved, with the characteristics of simple preparation, strong absorption performance, absorption frequency bandwidth.

The application relates to a preparation method of high-intermediate low-loss garnet ferrite with high bismuth substitution, and belongs to the field of microwave ferrite materials. 3+ The application reduces the volatilization of Bi by adding a small amount of H3BO3 and Bi2O3 as additives in the two-milling process, accelerates the growth of the crystal under the driving of the low-melting-point Bi2O3 additive in the sintering process, and accelerates the growth of the crystal under the driving of the low-melting-point Bi2O3 additive in the sintering process. 3+ The volatilization of Bi in the pre-sintering process is reduced by using a lower pre-sintering temperature, the optimal sintering temperature is wider, and the microstructure of the material is effectively improved. 3+ The volatilization of Bi in the sintering process is compensated by using a three-stage progressive holding sintering method in the high-temperature section of the final sintering, the sintering temperature and the holding time are controlled, the crystal grain growth is reduced after the continuous growth of the crystal grain, and the uniformity of the solid-phase reaction is improved.

The present invention generally relates to a method for synthesizing dysprosium-doped copper-zinc ferrite nanomaterials with enhanced structural and functional properties. The method comprises dissolving stoichiometric quantities of copper nitrate trihydrate, zinc nitrate hexahydrate, iron nitrate nonahydrate, and dysprosium nitrate hexahydrate in distilled water to prepare an oxidizer solution. A fuel mixture is separately prepared using urea and glucose in equal proportions by weight. The oxidizer and fuel mixtures are combined in 1:1 ratio, calculated based on their respective oxidizing and reducing valencies, to form a homogeneous precursor solution. This solution is stirred thoroughly for about one hour and subsequently transferred to a Pyrex dish. The dish is placed in a muffle furnace preheated to approximately 450° C., where the solution undergoes a self-sustained combustion reaction, yielding a fine, porous Cu0.5Zn0.5DyxFe2-xO4 ferrite powder within 20 minutes. The resultant powder is ground to achieve uniform particle distribution suitable for advanced applications.

The present invention developed a composite having a novel structure containing, in a high content, a powder having a radiation-shielding function.　Provided is a composite having a radiation-shielding function and a method for producing the same. The composite comprises a preform made from a mixture containing a liquid silica-based binder and one or more radiation-shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder, the radiation-shielding powder(s) being contained in the range from 3% to 85% in total. All of the voids in the preform are impregnated and filled with molten aluminum and solidification is allowed to occur to form a composite, or 25% or more of the voids in the preform are impregnated with a liquid organic / inorganic sealing agent and solidification is allowed to occur to form a composite. The liquid silica-based binder has properties that allow the preform to be formed at a temperature at which the radiation-shielding powder(s) does not decompose.

The invention discloses a cerium-doped modified pre-sintered material, ferrite prepared by using the pre-sintered material and a preparation method and application of the ferrite, and belongs to the technical field of permanent magnetic ferrites.The cerium-doped modified pre-sintered material is prepared by adopting a hydrothermal method, the dielectric constant of water is reduced and the ion product is increased at high temperature and high pressure, Fe < 3 + > can be promoted to be hydrolyzed to generate oxyhydroxide (alpha-FeOOH), and the performance of the ferrite is improved. Under the hydrothermal condition, alpha-FeOOH is converted into alpha-Fe2O3 after being dehydrated, Sr < 2 + > and Ce < 3 + > are diffused along alpha-Fe2O3 crystal lattice gaps through a solid-liquid interface diffusion mechanism, and finally the cerium-doped modified strontium ferrite is formed. Tiny crystal nucleuses obtained through the hydrothermal reaction can be deposited on the surfaces of large crystal grains, and stable nano-particles with the uniform size are formed.

Copper-boron-ferrite (Cu—B—Fe) composites may be prepared and immobilized on graphite electrodes in a silica-based sol-gel, e.g., from rice husks. Different bimetallic loading ratios can produce fast in-situ electrogeneration of reactive oxygen species, H2O2 and ·OH, e.g., via droplet flow-assisted heterogeneous electro-Fenton reactor system. Loading ratios of, e.g., 10 to 30 wt. % Fe3+ and 5 to 15% wt. Cu2+, can improve the catalytic activities towards pharmaceutical beta blockers (atenolol and propranolol) degradation in water. Degradation efficiencies of at least 99.9% for both propranolol and atenolol in hospital wastewater were demonstrated. Radicals of ·OH in degradation indicate a surface mechanism at inventive cathodes with correlated contributions of iron and copper. Copper and iron can be embedded in porous graphite electrode surface and catalyze the conversion of H2O2 to ·OH to enhance the degradation. Inventive cathodes can be stable catalytically after 20 or more cycles under neutral and acidic conditions.

The invention provides a MnZn ferrite material as well as a preparation method and application thereof, and belongs to the field of ferrite materials. The preparation raw materials of the MnZn ferrite material provided by the invention comprise main materials and auxiliary materials, wherein the main materials comprise the following components in percentage by mass: 71-73% of Fe2O3, 3-4.5% of ZnO and the balance of Mn3O4; the auxiliary materials are prepared from the following components in percentage by mass: 50 to 200 ppm of SiO2, 150 to 300 ppm of CaCO3, 200 to 300 ppm of Nb2O5, 1500 to 2500 ppm of Co2O3, 200 to 300 ppm of Cr2O3, 200 to 400 ppm of V2O5, 50 to 300 ppm of ZrO2, 100 to 400 ppm of La2O3, 100 to 300 ppm of Bi2O5 and 100 to 300 ppm of MoO3, and the auxiliary materials are prepared from the following components in percentage by mass: 50 to 200 ppm of SiO2, 150 to 300 ppm of CaCO3, 200 to 300 ppm of Nb2O5, 1500 to 2500 ppm of Co2O3, 200 to 300 ppm of Cr2O3, 200 to 400 ppm of V2O5, 200 to 300 ppm of ZrO2, 100

The invention relates to a method for preparing nano barium ferrite powder, in particular to a method for preparing nano barium ferrite through cooperation of laser annealing and neodymium doping. The method comprises the following steps: S1, preparing a ferrite amorphous strip from raw materials including Fe2O3, BaO, Nd2O3 and B2O3 by utilizing a smelting melt-spinning method; s2, irradiating the ferrite amorphous strip in the step S1 by using laser, and carrying out laser annealing; and S3, carrying out pickling crushing and filtering washing treatment on the annealed strip, and drying to obtain the neodymium-doped nano barium ferrite. According to the preparation method disclosed by the invention, through the synergistic effect of laser annealing and strong absorption of neodymium ions, overgrowth of crystal grains is effectively inhibited, and the particle size distribution of the nano ferrite is narrowed, so that the problems of wide particle size distribution of powder, low production efficiency and the like in the existing preparation technology are solved.

To provide a new method for producing quantum dots of an iron-containing sulfide different from a conventional one.SOLUTION: A method for producing quantum dots of an iron-containing sulfide includes a step of preparing a mixed solution in which at least ferrous hydroxide is present in water at 0 °C or higher and 30 °C or lower, a step of preparing a green rust-containing suspension by oxidizing the mixed solution to form green rust crystals in the mixed solution, and a step of raising the temperature of the suspension to 50 °C or higher and 100 °C or lower in an oxygen-free stream. A method for producing iron-containing sulfide quantum dots, the method comprising: synthesizing the ferrite quantum dots in the slurry; collecting the ferrite quantum dots in the slurry; and treating the ferrite quantum dots with hydrogen sulfide gas at 110 °C. or more and 150 °C. or less to substitute sulfide ions O2 - for oxide ions S2 - in the ferrite, thereby producing iron-containing sulfide quantum dots.SELECTED DRAWING: Figure 1

To develop a composite of a new constitution containing a powder having a radiation shielding function in a high content.SOLUTION: Molten aluminum is impregnated and filled into all voids of a preform made of a mixture containing one or more kinds of radiation shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder and a liquid silica-based binder, the mixture containing the radiation shielding powders in a range of 3 to 85% in total; In the composite body having the radiation shielding function and the method for manufacturing the same, a liquid organic-inorganic sealing agent is impregnated and solidified to form the composite body, and a liquid silica-based binder has characteristics capable of forming a preform at a temperature at which the radiation shielding powder is not decomposed.SELECTED DRAWING: None

The present disclosure relates to a method of making CuFe2O4 nanoparticles from metal cans. The method includes cutting the metal can into small pieces, adding concentrated nitric acid to the pieces to obtain an iron nitrate solution, and adding an aqueous sodium hydroxide solution to the iron nitrate solution to provide a precipitate. The precipitate can be centrifuged and dissolved with HNO3 to obtain an iron nitrate solution. The iron nitrate solution can be mixed with copper nitrates to obtain a mixture. Aqueous NaOH solution can be added to the mixture to obtain an aqueous precipitate including the CuFe2O4 nanoparticles.

The invention relates to the technical field of magnetic powder core preparation, and discloses a coated iron powder core and a preparation method and application thereof.The coated iron powder core comprises a base material and a coating layer coating the outer surface of the base material; the base material comprises ferromagnetic powder, and the coating layer comprises manganese zinc ferrite; the manganese zinc ferrite comprises a calcium element, a vanadium element and a niobium element; based on the mass of the coated iron powder core, the content of the manganese zinc ferrite is 10%-20%. In the iron powder core with the manganese zinc ferrite as the coating layer, the iron powder particles and the ferrite coating layer can form a parallel magnetic circuit on a magnetic field, the thin manganese zinc ferrite coating layer has little obstruction on magnetic flux, the magnetic conductivity of the iron powder core cannot be obviously reduced, and on the contrary, due to the fact that the manganese zinc ferrite coating layer can reduce the adverse effects of non-magnetic impurities and air gaps, the magnetic conductivity of the iron powder core can be improved. And the magnetic conductivity can even be improved.

Provided are a ferrite particle, a carrier for electrophotographic developers, and the like, which have: a ferrite particle main body having a spinel crystal structure belonging to space group Fd-3m, the spinel component being represented by a specific formula (1); and a coating layer having a spinel crystal structure belonging to space group Fd-3m, covering the surface of the ferrite particle main body; the coating layer being a layer obtained by heat treating a ferrite represented by the specific formula (1), the content ratio of the coating layer in the ferrite particle being 5 mass% or more and 35 mass% or less, as determined by Rietveld analysis of a powder X-ray diffraction pattern, and satisfying a specific formula (2).

To provide a ferrite composition that can reduce changes in eddy current loss due to differences in core size or shape, an electronic component using the ferrite composition, and a power supply device using the electronic component. [Solution] A ferrite composition having a main component, a first minor component, and a second minor component, wherein the main component is composed of 51.0 to 53.5 mol% iron oxide, 7 to 16.5 mol% zinc oxide, and the remainder being manganese oxide, and per 100 parts by mass of the main component, the first minor component contains 0.09 to 0.27 parts by mass of cobalt and 0.13 to 0.45 parts by mass of titanium, and per 100 parts by mass of the main component, the second minor component contains y parts by mass of silicon, niobium, vanadium, and calcium, the average crystal grain size is x μm, y is 0.10 to 0.32, x is 6 to 18, and y and x satisfy formulas (1) and (2).

The application relates to the technical field of permanent ferrite preparation, in particular to a method for preparing strontium ferrite by a multi-field coupling auxiliary molten salt method. First, a chemical coprecipitation method is improved to obtain a mixture containing an excess precipitant, inorganic salt and strontium ferrite precursor; then the mixture is subjected to heat treatment under multi-field coupling; finally, strontium ferrite powder is obtained after washing and drying. The application simplifies the chemical coprecipitation process, avoids Sr loss and realizes in-situ salt formation; a multi-element molten salt system is constructed during heat treatment, and an alkali-containing molten salt system with activation is proposed; in the molten salt liquid phase environment, multi-physical fields such as magnetic fields and ultrasonic vibration force fields are cooperated to control the orientation and growth of grains, new driving force and fast channels are provided for ion diffusion, and the rapid synthesis of strontium ferrite and the control of microstructure and size are realized in a low temperature and short time.

The present application relates to a kind of manganese zinc power ferrite material and its preparation method and application, the manganese zinc power ferrite material includes main component and additive, the main component includes Fe2O3, ZnO and MnO, the additive is composed of SnO2, CaCO3, ZrO2 And Co2O3.The present application is by the cooperation between each additive and the content control, and the raw material ratio of main component is combined, and then the component of manganese zinc power ferrite material is controlled, and combined with additive step-by-step mixing sintering process, so that the manganese zinc power ferrite material in 25~160 ℃ ultra-wide temperature range overall loss is low, i.e., in 100kHz, 200mT condition 25 ℃ power consumption≤360kW / m 3 , 100 ℃ power consumption≤310kW / m 3 , 160 ℃ power consumption≤360kW / m 3 .

The application relates to a cobalt ferrite nanometer magnetic material with high magnetic permeability and low loss and a preparation method thereof, and belongs to the technical field of nanometer magnetic materials. The cobalt ferrite nanometer magnetic material with high magnetic permeability and low loss is mainly prepared from the following components: ferric chloride, cobalt chloride hexahydrate, manganese chloride, zinc sulfate, modified propylene glycol alginate acid ester, lithium chloride, silicon nitride and barium carbonate. The cobalt ferrite nanometer magnetic material prepared by the application has the characteristics of high magnetic permeability and low loss.

An embodiment of the present invention provides a high strength thin steel material for API having excellent resistance to deformation and a method of manufacturing same, the steel material comprising, in weight %, C: 0.05-0.15%, Si: 0.5% or less (0% excluded), Mn: 0.5-2.5%, Nb: 0.05% or less (0% excluded), V: 0.004% or less (0% excluded), Mo: 0.03-0.2%, Cr: 0.1-0.3%, P: 0.03% or less (0% excluded), S: 0.015% (0% excluded), Al: 0.05% or less (0% excluded), N: 0.01% or less (0% excluded), and the balance being Fe and other inevitable impurities, wherein the microstructure of the steel material comprises, in area %, ferrite: 10~30% and the balance being bainite, the ferrite having an average crystal grain size of 15-30 μm and including 3,000 / μm2 or less V-based precipitates.

The application discloses a high-power-density high-resistivity M-type strontium ferrite and belongs to the technical field of ferrite material preparation. The ferrite comprises a main formula formed by SrCO3, La2O3, CaCO3, Fe2O3 and Co2O3, and an additive composed of CaCO3, SiO2, H3BO3 and Sb2O3. The application is characterized in that: the powder with different pre-sintering temperatures is compounded, and the crystallization is carried out under the same sintering temperature and holding time, so that the obtained microstructure makes the green body have less porosity and more uniform structure, and the sintering density of the strontium ferrite material is remarkably improved. Meanwhile, the H3BO3-Sb2O3-CaCO3-SiO2 composite additive system is combined, the sintering driving force is connected in the whole sintering temperature range, the densification driving force in the whole sintering temperature range is improved, and the excellent performances of high density, fine grain and high resistivity are obtained.

The application relates to the technical field of wave-absorbing materials, in particular to a wide-band calcium ferrite wave-absorbing material and a preparation method and application thereof. 1.8 La 0.2‑x Ce x Fe2O5, wherein 0<=x<0.14. The application solves the problems of narrow absorption frequency band and low efficiency of the oxide wave-absorbing material by adjusting the composition and dielectric properties of the material through La and Ce double-element co-doping, and the prepared material has the advantages of wide absorption frequency band and high absorption intensity.

Provided are: a method for producing composite particles in which seed particles and cobalt ferrite particles can be synthesized with relatively low energy, the composite particles having a particle diameter within a specific range, having a circular shape with a predetermined average circularity, and having specific magnetic characteristics; composite particles of seed particles and cobalt ferrite particles manufactured by this manufacturing method have a circular shape having a predetermined average circularity, have specific magnetic properties, and have uniform particle diameters. The provided method for manufacturing composite particles of seed particles and cobalt ferrite particles comprises: a step in which a ferrous salt and a cobalt salt are stabilized by a complexing agent in an aqueous solution to prepare a ferrite precursor; a step in which spherical or substantially spherical seed particles are added to the ferrite precursor; and a step in which the ferrite precursor is additionally heat-treated.

A system for the synthesis of magnetoelectronically tunable spinel ferrite nanoparticles, comprising: a) a precursor preparation unit for the preparation of a homogeneous nitrate precursor solution, wherein the precursor preparation unit facilitates the dissolution of stoichiometric amounts of magnesium nitrate hexahydrate, nickel nitrate hexahydrate, iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate in deionized water; b) a fuel mixing unit configured to introduce a binary mixture of urea and glucose into the dissolved homogeneous nitrate solution in a fuel-oxidant ratio that achieves fuel equivalence; c) a gel formation unit configured to maintain the temperature at 70-80 °C under continuous stirring to convert the fuel mixture into a viscous gel; d) a combustion unit comprising a preheated muffle furnace maintained at 450 ± 10 °C and enabling the initiation of a self-propagating combustion reaction; and e) a calcination plant configured for the thermal treatment of crushed precursor ash at 600 °C for 2 hours and subsequently at 750 °C for 2 hours to produce phase-pure cubic spinel Mg 1-x Ni x To produce FeCrO4 nanoparticles.

The invention relates to the technical field of ferrite materials, in particular to a seawater corrosion resistant ferrite material and a preparation method thereof. The preparation method of the seawater corrosion-resistant ferrite material comprises the following steps: preparing a ferrite ceramic matrix material; preparing a pretreated ferrite material; and preparing the seawater corrosion resistant ferrite material. The magnesium nitrate hexahydrate, the aluminum nitrate nonahydrate, the lanthanum nitrate hexahydrate, the chromium nitrate nonahydrate and the ferric nitrate nonahydrate are dissolved to prepare the sol, and then the sol is dried, pre-sintered and calcined in sequence, so that an MgAlOphase and an LaCrOphase are generated in a magnesium ferrite matrix in situ, a permeation path of a corrosive medium to the interior of the matrix can be effectively blocked, and the corrosion resistance of the magnesium ferrite matrix is improved. The MgAlO phase particles and the LaCrO phase particles are added into the ferrite ceramic matrix material and play a role in passivating the grain boundary, so that the seawater corrosion resistance of the ferrite ceramic matrix material can be improved, in addition, the MgAlO phase particles and the LaCrO phase particles can also change the crack propagation path of the magnesium ferrite matrix, and the fracture toughness of the ferrite ceramic matrix material is improved.

The invention discloses a manganese-zinc ferrite and a preparation method thereof, and belongs to the technical field of ferrites.The manganese-zinc ferrite comprises a main component and an additive, the additives comprise the following main components in percentage by mass: 4000-6000 ppm of a nano cobalt oxide-titanium dioxide composite material, 600-1200 ppm of CaCO3, 200-400 ppm of ZrO2 and 200-500 ppm of Nb2O5. According to the invention, the pre-synthesized nano cobalt oxide-titanium dioxide composite material is introduced as the additive, the modified polyvinyl alcohol solution is used as the binder, and the other components are matched, so that the wear resistance of the ceramic is improved, and the service life of the ceramic is prolonged. And the anisotropy and grain boundary characteristics in ferrite grains are synergistically optimized, so that the hysteresis loss and eddy-current loss of the material are reduced, and finally, low and stable power loss in a wide temperature range and a wide frequency range is realized.

The invention discloses a preparation method of carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder, which comprises the following specific steps: weighing ferrite synthetic components, spherical carbonyl iron powder and tetraethoxysilane according to a ratio, the ferrite synthetic components comprise 52-56 mol% of Fe2O3 and the balance of CoO, and the spherical carbonyl iron powder and the tetraethoxysilane are mixed according to a certain ratio to prepare the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder, and the spherical carbonyl iron powder and the tetraethoxysilane are mixed according to a certain ratio to prepare the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder. The carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder is finally obtained through the steps of ball milling, stirring, drying, primary sintering, mixing, secondary sintering and the like. The method for preparing the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder is simple and convenient in process, safe and low in cost, and after the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder is used for preparing wave-absorbing products, the excellent performance of broadband strong absorption is shown in the frequency band of 2-18 GHz.

The present invention relates to the technical field of iron oxide red preparation. Disclosed is a method for preparing high-purity iron oxide red by microwave roasting and ultrasonic-enhanced acid leaching of coal gangue. By controlling the microwave roasting temperature of the coal gangue to be 500°C and the time to be 30 min, the iron dissolution rate reaches 93.6% under the conditions of an optimal ultrasonic power of 300 W, an acid concentration of 20%, an acid leaching temperature of 80°C, an acid leaching time of 30 min, and a liquid-solid ratio of 4 mL / g. A leaching solution is extracted by using a solvent extraction method (TBP-SK-hydrochloric acid system). After extraction, the content of iron ions in the solution is as high as 99.78%; and the optimal pH for hydrothermal treatment is controlled to 11, the temperature is controlled to 170°C and the time is controlled to 3 h, so as to prepare a high-purity iron oxide red product. The iron oxide red has a purity of 99.89%, which meets the requirement (98.5%) of "YHT4 Iron Oxide Standard for Ferrite" (GB / T 24244-2009), and can be used as a raw material for producing high-performance soft-magnetic ferrite.