687 results about "Brown iron oxide" patented technology

The invention provides a production process for stably controlling adhesive force of a DP steel zinc layer. The production process comprises the following steps: step 1, setting a heating section 1, a heating section 2 and a furnace nose section in a total radiation heating annealing furnace; 2, according to the model and thickness of DP steel, target dew points of a first heating section, a second heating section and a furnace nose section are set; 3, according to the target dew points set in the first heating section, the second heating section and the furnace nose section in the step 2, water vapor is put into the protective gas for humidification, and the water vapor reacts with Si, Mn and Cr elements enriched on the surface of the steel plate to generate volatile oxides; the dew point of the annealing furnace is precisely controlled in a segmented mode, different humidification modes are adopted, and the surface state is controlled, so that surface oxide residues are reduced, cleanliness of a steel substrate is guaranteed, and the binding force of a zinc layer is improved; the iron oxide layer formed on the surface of the steel plate enters a reducing atmosphere annealing furnace containing hydrogen, the hydrogen can reduce the iron oxide layer on the surface of the steel plate to form a reduced iron layer, and the adhesive force of a zinc layer is improved.

The invention relates to the technical field of metal material hot working, and discloses a hot-rolled coiled plate production process which comprises the following steps: preparing a reaction type protective agent, the high-temperature-resistant coating is prepared from the following raw materials in parts by weight: 20 to 40 parts of tetraethoxysilane, 5 to 15 parts of triethyl phosphate, 1 to 5 parts of triethyl borate, 0.5 to 2.0 parts of cerous nitrate (III) hexahydrate, 0.1 to 1.0 part of lithium acetate and 0.01 to 0.05 part of vanadyl acetylacetonate (IV). Coating the surface of a hot-rolled plate blank with the protective agent; the coated plate blank is heated in a heating furnace, so that the protective agent forms a molten-state protective layer in situ; carrying out hot rolling on the plate blank with the molten protective layer; and cooling and coiling the hot-rolled steel strip. In the whole heating and hot rolling process, the molten protective layer isolates the contact between the steel and the oxidizing atmosphere, so that the generation of oxide scales is fundamentally inhibited, the production process is simplified, and the metal yield is increased.

The invention discloses a method for improving corrosion resistance of steel, and belongs to the technical field of metal protection. The method for improving the corrosion resistance of the steel comprises the following procedures of acid pickling, rinsing, drying, reduction, hot dipping, passivation, drying and packaging. Replacing a plating assisting process in the hot dipping process with a thermal reduction process; and in the thermal reduction process, hydrogen with the volume content of 3-25% is adopted for thermal reduction. A plating assisting technology in a traditional hot dipping technology is replaced with a reduction technology, the steel obtained after acid pickling is dried and then fed into the atmosphere box, a small amount of iron oxide remaining on the surface of the steel is reduced into sponge iron in the hydrogen reduction atmosphere, the surface of the steel keeps active, and then a zinc-based or zinc alloy plating layer can be better plated; therefore, the corrosion resistance of the steel is greatly improved, and the service life is prolonged.

A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

The invention relates to a process for extracting iron from red mud by using hydrogen reduction and electrolysis technologies, the red mud is a by-product generated in the industrial production process of aluminum, the environmental burden caused by the by-product can be solved, the carbon emission can be reduced, and the development of a green metallurgical technology can be promoted. Comprising the following steps: conveying red mud serving as a raw material into a rotary furnace, conveying hydrogen serving as a reducing medium into the rotary furnace, enabling iron oxide in the red mud to form hydrogen reduced iron in a furnace heating state and a hydrogen reducing atmosphere, conveying the red mud containing the hydrogen reduced iron into a sulfuric acid solution, the hydrogen reduced iron is dissolved in the sulfuric acid solution to form a sulfuric acid solution containing iron ions, the sulfuric acid solution containing the iron ions serves as an electrolyte in an electrolysis device, and electrolytic pure iron formed by electrolytic deposition of the iron ions is obtained through the electrolysis device.

The invention belongs to the field of metal materials, and particularly relates to a hot-rolled pickled steel plate for an automobile chassis and a production method thereof. The steel plate is mainly suitable for manufacturing automobile chassis structural parts. The steel comprises the following chemical components: C, Si, Mn, Al, Ta, Ni, Cu, Cr, Pt and Y, P is limited to be less than or equal to 0.015%, S is limited to be less than or equal to 0.005%, N is limited to be less than or equal to 0.003%, and the balance is Fe and inevitable impurities. The yield strength of the steel plate is larger than or equal to 265 MPa, the tensile strength is larger than or equal to 378 MPa, the transverse elongation A is larger than or equal to 46%, transverse cold bending is conducted by 180 degrees, D = a, the steel plate is qualified, the surface quality is good, oxide scale stripes and chromatic aberration defects are avoided, the surface roughness Ra is 1.10-1.35 micrometers, and the steel plate has good corrosion resistance.

The invention discloses a sulfur iron oxide composite denitrification filler, a preparation method and application, and relates to the technical field of sewage treatment, the sulfur iron oxide composite denitrification filler comprises sulfur powder, siderite, magnesite, magnesium oxide, metal manganese, metal aluminum, nano iron, boric sludge, magnetite and a binder; wherein the sum of the addition amounts of the metal manganese, the metal aluminum and the nano iron accounts for 8-16% of the mass of the sulfur-iron oxide composite denitrification filler. The technical problems that in the prior art, strength and abrasion resistance are insufficient, and denitrification efficiency is low are solved.

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

The invention relates to the technical field of material surface corrosion prevention, in particular to a spraying method for a heavy anti-corrosion coating of a port steel structure. The method comprises the following steps that (1) sand blasting derusting treatment is conducted on a steel structure base body, so that the cleanliness of the steel structure base body reaches the Sa2.5 level, and the roughness is controlled to range from 40 micrometers to 75 micrometers; 2) coating the treated substrate with epoxy zinc-rich primer, and doping graphene modified zinc powder accounting for 1-3% of the total mass of the primer to form a primer layer with a dry film thickness of 60-80 [mu] m; (3) after the primer layer is cured, the primer layer is coated with epoxy micaceous iron oxide intermediate paint, aluminum tripolyphosphate accounting for 2-5% of the total mass of the intermediate paint is further added into the epoxy micaceous iron oxide intermediate paint, and an intermediate paint layer with the dry film thickness being 150-200 microns is formed; 4, the middle paint layer is coated with weather-resistant finish paint, and a finish paint layer with the dry film thickness being 60-80 microns is obtained.According to the method, the adhesive force, chloride ion permeation resistance, salt fog resistance (larger than or equal to 3000 hours) and weather resistance of the coating are remarkably improved, the method is suitable for the harsh marine environment, and the service life of the steel structure can be prolonged to 20 years or above.

A nanocomposite material including iron sulfide (FeS2) nanoparticles, iron oxide (α-Fe2O3) nanoparticles, titanium dioxide (TiO2) nanoparticles, and graphitic carbon nitride (C3N4) nanosheets and a method of its preparation. The nanocomposite is used in a method of forming oxygen gas from water using an applied voltage and photoirradiation, a method of forming hydrogen gas from water using an applied voltage and photoirradiation, and a method of photodegrading organic pollutants using visible light photoirradiation.

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 high-aluminum limonite and specularite ore blending and sintering method which comprises the following steps: 1) preparing primary pre-blending powder: pre-blending high-aluminum limonite, specularite concentrate powder, iron oxide scale, limestone powder and anthracite powder to prepare the primary pre-blending powder with the water content of 6.5-7%; (2) preparing a uniformly mixed material: blending the primary pre-blended material powder obtained in the step (1) with high-silicon iron ore powder and hematite and limonite powder to prepare the uniformly mixed material; 3) sintering and burdening: burdening the uniformly mixed material obtained in the step 2) with limestone, dolomite powder, quicklime, solid fuel and return mine, and 4) controlling the components of the sintered ore as follows: 2.3-2.5% of Al2O3, 5.7-6.5% of SiO2, 8-8.5% of FeO and 1.85-2.5% of MgO. According to the invention, while 20-30% of the proportion of the discount ore silk road powder in the total uniformly mixed material is increased, the sintering cost is reduced by 20-42 yuan / ton, the drum strength of the sintered ore is greater than or equal to 78.5%, the return mine rate is less than or equal to 27%, and the RDI + 3.15 mm is greater than or equal to 63%.

The invention relates to the technical field of bolts, and provides a bolt special for stainless steel mechanical equipment and a preparation method thereof. A bolt special for stainless steel mechanical equipment comprises a bolt body and a surface coating, and the surface coating is prepared from, by weight, 100 parts of epoxy resin E-44, 50-55 parts of a curing agent, 1.5-2 parts of a curing accelerator, 20-25 parts of flaky iron oxide, 10-12 parts of modified boron nitride, 2-3 parts of an ultraviolet light absorber, 3-5 parts of silicon dioxide, 1-1.5 parts of a dispersing agent, 25-35 parts of butanone and 10-12 parts of xylene. According to the bolt special for the stainless steel mechanical equipment, the corrosion resistance of the stainless steel bolt in a high-concentration acid-base solution and high-temperature and high-pressure seawater is improved.

The invention relates to the technical field of sewage treatment, particularly discloses an iron oxide red wastewater treatment system and treatment method based on anaerobic ammonia oxidation coupled AI prediction, and solves the problems of insufficient prediction capability and high operation cost in the prior art. The system comprises a sewage treatment module and an AI control module, wherein the sewage treatment module adopts an integrated biofilm process anaerobic ammonia oxidation system, is equipped with a sensing equipment group to detect water quality parameters, and controls the equipment group to execute instructions; the AI control module receives water quality data through a real-time data interface, generates feature data in combination with a production plan and a scheduling table, predicts water quality by using a GRU-QR model and outputs an advanced control instruction, and then dynamically optimizes the model and triggers compensation control according to actually measured data to form double closed-loop control. The system has the advantages of stable effluent ammonia nitrogen, high efficiency, improvement of regulation and control precision, reduction of medicament dosage and the like, and can effectively reduce the cost and realize high-intelligence control.

The invention relates to a process for preparing pure iron by using red mud, which is characterized in that the red mud is Bayer process red mud, i.e., solid waste residue formed by solid-liquid separation after aluminum oxide is dissolved out from bauxite through high temperature, high pressure and strong alkali in the process of producing aluminum oxide by adopting a Bayer process, so that the environmental burden caused by the Bayer process red mud can be solved; the method is beneficial for reducing carbon emission in the aspect of iron element extraction and promoting development of a green metallurgical technology, and is characterized by comprising the following steps: taking Bayer process red mud as a raw material, carrying out acid leaching on the Bayer process red mud to obtain a ferrous oxalate extract, calcining the ferrous oxalate to obtain iron oxide, and recycling the iron oxide. And dissolving the ferric oxide into a sulfuric acid solution to obtain a ferric sulfate solution, taking the ferric sulfate solution as an electrolyte in an electrolysis device, and obtaining electrolytic iron through the electrolysis device, so that the pure iron is prepared from the red mud.

The invention belongs to the technical field of iron oxide preparation, and discloses a method for purifying iron oxide for soft magnetic ferrite from red mud and application of the method. The red mud is subjected to crushing and wet grinding, and red mud slurry is obtained; the red mud slurry is subjected to magnetic separation, drying and grinding into powder, and a magnetic product containing ferric oxide is obtained; the magnetic product is subjected to acid leaching and suction filtration with hydrochloric acid, and first filtrate is obtained; carrying out alkaline leaching treatment on the first filtrate by adopting sodium hydroxide, filtering and drying to obtain a red brown dry material; grinding the red brown dry material into powder, washing with deionized water, carrying out suction filtration, and drying to obtain a first dry material; and grinding the first dry material to a powder state, and carrying out aerobic sintering to obtain the reddish brown solid iron oxide. The iron oxide extracted through the method can replace existing high-purity commercial iron oxide and can be applied to preparation and development of soft magnetic materials, and various properties of the soft magnetic materials are indifferent or even higher.

The present invention relates, in general terms, to a face mask. The present invention also relates, in general terms, to composite material, iron-iron oxide compositions and their methods of fabrication thereof. In particular, the iron-iron oxide composition comprises a cashew testa extract and iron particles and / or oxide core-shell particles. The iron-iron oxide composition can be used as an anti-microbial composition.

The invention relates to a novel phosphorus-fluorine curing agent for phosphogypsum and a preparation method thereof, and belongs to the technical field of industrial solid waste treatment and resource utilization. The curing agent comprises superfine slag powder, anhydrous sodium sulfate, water glass, water, sodium hydroxide and a Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer. The Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer is of a core-shell structure, magnetic ferroferric oxide particles serve as a core, and the surfaces of the magnetic ferroferric oxide particles are sequentially coated with an amorphous silicon dioxide protection layer and an active layer. And the active layer is an amorphous and porous zirconium-aluminum bimetallic oxide with a network structure. The preparation method of the curing agent is simple, mild in condition and easy for industrial production, the main raw material is the industrial solid waste slag, the effect of treating waste with waste is achieved, the agent addition amount is small, and the comprehensive treatment cost is low.

The invention discloses an iron oxide pigment with super weather resistance and corrosion resistance and a preparation method thereof, and relates to the technical field of weather-resistant and corrosion-resistant iron oxide pigments. The invention discloses an iron oxide pigment with super weather resistance and corrosion resistance. The iron oxide pigment is prepared from the following components in parts by mass: 100 parts of iron oxide, 1.5 to 3 parts of silane coupling agent, 2 to 4 parts of aluminum zirconate, 0.5 to 1.5 parts of weather-resistant antioxidant, 0.8 to 2 parts of molybdate corrosion inhibitor, 0.5 to 2 parts of nano silicon dioxide and 0.3 to 1 part of organic bentonite. Through an innovative composite formula and a preparation process, the stability of the iron oxide pigment in severe environments such as ultraviolet rays, damp heat and salt mist is greatly enhanced, excellent weather resistance and corrosion resistance are shown, the service life of the material can be effectively prolonged, and the maintenance cost can be reduced.

The invention discloses a method for synthesizing iron phosphate from iron oxide red, and belongs to the technical field of iron phosphate. The method comprises the following steps: (1) diluting concentrated phosphoric acid to obtain 45-70wt% phosphoric acid, using pure water as a diluent, and recovering washing liquor and / or recovering filtrate; (2) dissolving iron oxide red in 45-70wt% phosphoric acid with the weight 4-8 times that of the iron oxide red, and stirring and dissolving at 75-95 DEG C for 1-4 hours; (3) performing solid-liquid separation, taking filtrate, heating the filtrate to 50-70 DEG C, adding pure water of which the weight is 0.7-1.5 times that of the filtrate, and continuously heating the filtrate to 90-100 DEG C at the heating speed of 0.8-1.5 DEG C / min; after the solution is changed from red to powder white, continuously carrying out heat preservation reaction for 2-5 hours; (4) carrying out solid-liquid separation to obtain recovered filtrate; washing the filter residues for 1-2 times, wherein pure water which is 8-15 times of the filter residues is used for washing each time; combining the washing liquor to obtain recycled washing liquor; and (5) drying the washed filter residues to obtain iron phosphate.

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

The invention discloses an iron-based nanoparticle and titanium dioxide magnetoelectric core-shell structure composite wave-absorbing material and a preparation method thereof, and belongs to the technical field of microwave absorbing materials. According to the preparation method, ferroferric oxide coated with titanium dioxide is taken as a precursor, and based on a confinement hydrogen reduction process, the relative content of a titanium dioxide shell layer and an iron and iron oxide composite core is changed by adjusting the dosage of tetrabutyl titanate, so that the construction and regulation of the magnetoelectric core-shell structure are realized. In the obtained composite wave-absorbing material, iron in the magnetic core can provide strong magnetic loss, iron oxide can improve impedance matching characteristics and introduce dielectric loss, and the titanium dioxide shell layer can enhance interface polarization and optimize impedance matching, so that the composite wave-absorbing material shows excellent low-thickness and broadband wave-absorbing characteristics. Meanwhile, the preparation process disclosed by the invention does not need large complex equipment, does not involve the use of highly toxic compounds, and has a relatively high popularization value.

The invention relates to the technical field of blast furnace iron making, and particularly discloses a blast furnace composite stemming and a preparation method thereof.The blast furnace stemming is prepared from, by mass, aggregate including (43-X1-X2-X3)% of brown fused alumina, 13% of coke, (16-B)% of SiC, B% of clay, 4.5% of sericite, 7% of kyanite, 7.5% of silicon carbide iron, 4% of ball pitch, 5% of iron area waste mixture, 1% of iron oxide scale Fe3O4 X, 2% of cubic boron nitride c-BN X and 3% of graphene oxide GO X; comprising the following components in percentage by weight: 13-C% of tar, C% of asphalt and 2% of sodium pyrophosphate Na4P2O7; according to the method, stemming softening caused by excessive use of the oxide scale when the cold air pressure is low is prevented, the problems of incomplete internal structure and insufficient strength development of stemming caused by insufficient heat are avoided, excessive use of nanoscale materials is avoided, and the material cost is reduced.

The invention relates to an anti-collision automatic iron oxide powder blowing device. The device comprises an anti-collision device, a lining plate, a hoisting hole, a device fixing bolt, an air pipe fixing pipe clamp, an electric control valve, a bypass hand valve, a spraying beam pipeline, an air blowing nozzle, a photoelectric switch and the like. The anti-collision unit is a push-pull type pickling unit, has single uncoiling and single coiling, multiple steel grades, high strength, large thickness and poor head and tail plate shapes, and can cause damage to a spray beam nozzle, so that an anti-collision design needs to be added. Wherein the iron oxide powder is a hot-rolled pickled plate (coil) oxide scale which is not uniform, a large amount of crushed iron oxide powder falls off from the surface of the strip steel after the scale is broken by a crease-resistant roller, the iron oxide powder is adhered to the roller surface of a straightening machine to generate surface indentations when passing through the straightening machine, the surface quality defect of the strip steel is caused, the waste reduction of a unit is increased, and the production cost is reduced. Product quality is affected, and dissatisfaction of customers is caused. By designing the anti-collision automatic iron oxide powder purging device, strip steel threading is automatically started through signal purging of the photoelectric switch, broken iron oxide powder falls off from the surface of the strip steel in time, cleanliness of the roller surface of a straightening machine is guaranteed, the indentation defect generated due to the fact that the iron oxide powder adheres to the roller surface of the straightening machine is eliminated, the product quality is improved, and the production efficiency is improved. And the requirements of customers are met.

An iron oxide-ceria nanoparticle, an iron oxide-ceria nanostructure and an iron oxide-ceria nanocomposite are provided. The iron oxide-ceria nanoparticle comprises iron oxide and ceria. The iron oxide-ceria nanostructure comprises an inorganic support and a plurality of iron oxide-ceria nanoparticles dispersed in the inorganic support. The iron oxide-ceria nanocomposite comprises: an inorganic support; a plurality of iron oxide-ceria nanoparticles dispersed in the inorganic support; and a polymer layer that encompasses the inorganic support.

The utility model relates to the technical field of iron oxide pigments, in particular to iron oxide pigment production equipment capable of removing impurities, which comprises a workbench, an impurity removal box is arranged at the top of the workbench, an impurity removal frame is arranged in the impurity removal box, and two sides of the outer wall of the impurity removal frame are connected with two sides of the inner wall of the impurity removal box through two springs. A connecting plate is arranged on one side of the impurity removing frame, a semicircular groove is formed in the connecting plate, and a plurality of fixed arc-shaped blocks are arranged on the inner wall of the semicircular groove. According to the iron oxide pigment impurity removal device, the rotating shaft is driven by the motor to rotate, then the disc is driven to rotate in the semicircular groove, the fluctuation block impacts the fixed arc-shaped block, then the impurity removal frame is driven to vibrate, iron oxide pigment passes through the impurity removal holes, particle impurities are intercepted, and impurity removal treatment on the iron oxide pigment is facilitated.

The application discloses iron oxide coated silica core-shell nanoparticles and a preparation method and application thereof. The iron oxide coated silica core-shell nanoparticles comprise silica nanoparticles as an inner core and iron oxide nanoparticles as an outer shell coated on the inner core surface of the silica nanoparticles; the particle size is 22-112 nm; and the particle uniformity is 0.08-0.3. The preparation method of the iron coated silica nanoparticles provided by the application adopts the measure of adjusting the pH of slurry for multiple times, avoids the agglomeration of nanoparticles in a solution near the isoelectric point, and is thus favorable for finally obtaining core-shell nanoparticles with uniform monodispersity. No surfactant is used in the preparation process, and there is no complicated post-treatment process, thereby reducing the production cost. The uniformly monodispersed nanoparticles prepared by the method have great potential in the field of chemical mechanical polishing.

The invention discloses a method for removing iron and copper from molybdenite, which comprises the following steps: uniformly mixing the molybdenite and magnesium chloride, carrying out high-temperature vacuum melting, removing iron sulfide, copper oxide and other impurities in the molybdenite through vacuum chlorination melting, directly recycling magnesium chloride in a condensing disc in one step for reutilization, carrying out water leaching and acid leaching washing on roasting residues, and drying. Removing residual iron oxides and magnesium compounds generated by chlorination to obtain residues rich in molybdenum disulfide; according to the method, the iron and copper impurities in molybdenite are effectively removed in a vacuum chloridizing roasting and acid leaching mode, and the method has the advantages of being short in process, low in cost, high in metal recovery rate and small in environmental pollution.

A method for making an iron-based oxide magnetic powder includes adding raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution to a reaction system to adjust the pH of the reaction system to 1.0 or higher and 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and thereafter the pH of the reaction system is neutralized to 7.0 or higher and 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide and then heated, whereby an iron-based oxide magnetic powder is obtained with a reduced content of fine and coarse particles, a particle shape close to a perfect sphere, and particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements.

The invention belongs to the technical field of magnetic material preparation, and particularly relates to a production process of high-performance rare earth permanent magnetic ferrite magnetic powder. The process comprises the following steps: preparing iron oxide red and auxiliary materials, wherein the auxiliary materials comprise calcium carbonate, strontium carbonate, lanthanum oxide and cobalt oxide; mixing the raw materials in proportion, and then carrying out dry ball-milling densification to obtain a mixed material; the obtained mixture is subjected to steam treatment, the water content of the mixture reaches 2%-5%, then curing is conducted, the curing time is at least 30 min, and the curing process is completed in the auger transfer process; pelletizing is performed; pre-sintering is performed; and coarsely crushing and sieving the pre-sintered material to obtain the rare earth permanent magnetic ferrite magnetic powder. Through steam pretreatment and curing, the strength and thermal stability of the ball material are remarkably improved, the ball material is kept complete and good in fluidity in the kiln, and the consistency and the qualified rate of products are improved.