317 results about "Diiron Trioxide" patented technology

The embodiment of the invention discloses a biological composite liquid material capable of releasing negative oxygen ions as well as a preparation method and application of the biological composite liquid material. The invention discloses a preparation method of a traditional Chinese medicine. The biological composite liquid material is prepared from 12 to 18 parts of plant extract, 1 to 4 parts of silver ion solution, 2 to 5 parts of titanium dioxide, 10 to 15 parts of nano silicon dioxide, 2 to 8 parts of sodium oxide, 1 to 6 parts of magnesium oxide dispersion liquid, 0.5 to 1.5 parts of calcium hydroxide solution, 1 to 3 parts of ferric oxide colloidal solution, 2 to 6 parts of zinc oxide dispersion liquid, 12 to 18 parts of mixed silica sol and 15 to 20 parts of nano borosilicate liquid material. 0.5-1.5 parts of a surfactant, 4-8 parts of glycerol and 10-15 parts of deionized water. The biological composite liquid material has the characteristic of efficiently releasing negative oxygen ions, can effectively improve the air quality, is good in stability, convenient to use, safe and reliable, can be widely applied to the fields of air purification, medical care, building materials and the like, and has a wide market prospect.

The invention discloses a humic acid liquid fertilizer and a preparation method and application thereof, and belongs to the technical field of liquid fertilizers, organic waste and ferric oxide are ball-milled and mixed, transferred into a muffle furnace, roasted for 2-2.5 h at 280-310 DEG C under nitrogen protection, transferred into a reaction kettle and stirred and mixed with a 10 wt% hydrogen peroxide aqueous solution and potassium hydroxide powder, and the humic acid liquid fertilizer is obtained. The preparation method comprises the following steps: adding potassium humate into a potassium humate solution, extracting for 40-60 minutes under the assistance of ultrasonic waves, filtering to obtain a potassium humate extract and filter residues, transferring the potassium humate extract into a stirring kettle, adding urea, dipotassium phosphate, a composite carbon dot lubricant and a suspension stabilizer into the stirring kettle, and uniformly mixing to obtain the humic acid liquid fertilizer. The suspension stabilizer can reduce the generation of flocculation and crystallization in the liquid fertilizer, and through the antifriction and lubrication effects of the composite carbon dot lubricant, the friction force between indissolvable solids and water outlet holes of the drip irrigation equipment is reduced, and the risk of blockage of the drip irrigation equipment is reduced.

The invention belongs to the technical field of architectural ceramics, and particularly discloses radiation refrigeration glaze, a preparation method thereof and a lightweight ceramic tile. The radiation refrigeration glaze comprises a basic glaze and radiation refrigeration powder, the radiation refrigeration powder comprises nano-porous alumina and metallic oxide doped magnesium aluminate spinel, and the metallic oxide is selected from at least one of iron sesquioxide, manganese dioxide, cobalt sesquioxide and copper oxide. According to the invention, nano-porous alumina and metallic oxide doped magnesium aluminate spinel are compounded as radiation refrigeration powder, and the radiation refrigeration powder is added into the cover glaze of the light ceramic tile, so that not only are good glaze quality and tile shape obtained, but also the sunlight reflectivity ratio of the glaze is improved, thereby achieving a good radiation refrigeration effect, and improving the service life of the light ceramic tile. The sunlight reflectivity reaches up to 88-94%, the glaze quality and the brick shape are good, and the surface flatness is + / -0.3 mm.

The invention belongs to the field of soft magnetic ferrite, and discloses a high-frequency low-loss manganese zinc ferrite material and a preparation method thereof, and the manganese zinc ferrite material comprises main components and auxiliary components. The main components comprise ferric oxide, zinc oxide, manganese oxide and cobaltosic oxide. The auxiliary components comprise calcium carbonate, silicon dioxide and tantalum pentoxide. The preparation method of the manganese zinc ferrite material comprises the following steps: proportioning, drying and ball-milling; pre-sintering is performed; performing secondary ball milling; performing granulation; forming is conducted; sintering is performed; and performing thermal aging. The manganese-zinc ferrite prepared by the invention has relatively low power loss under a high-frequency condition, and can be applied to the field of electronic materials related to power conversion, such as transformers and inductors.

The invention discloses a thermal insulation material with enhanced thermal insulation performance and a processing method, and relates to the technical field of thermal insulation material processing. Comprising the following components in parts by weight: 100 to 200 parts of a nanopore matrix material, 20 to 120 parts of expanded perlite, 10 to 350 parts of polystyrene, 30 to 300 parts of polyurethane, 100 to 500 parts of nano titanium dioxide, 10 to 60 parts of graphene, 10 to 40 parts of silica sol and 1 to 55 parts of ferric oxide. A multi-stage pore structure is constructed through a nanopore matrix and expanded perlite, closed-cell foam of polystyrene and polyurethane is combined, and nano titanium dioxide and graphene functional filler are matched, so that the heat conductivity coefficient is reduced to 0.018 W / (mK) or below, the heat insulation efficiency is remarkably improved, nanoscale homogenization is ensured through high-shear dispersion in the process, the porosity is reserved through freeze drying, and the heat insulation performance is greatly improved. The microcapsule self-repairing layer can repair more than 85% of cracks, the service life is greatly prolonged, and in the aspect of function integration, the material has A-level fireproof, waterproof and weather-proof characteristics and heat preservation and heat insulation performance.

The invention relates to a stainless steel flux-cored wire and a preparation method thereof, and relates to the technical field of flux-cored wires. The stainless steel flux-cored wire comprises a stainless steel strip and a double-layer flux core, the stainless steel strip is filled with the double-layer flux core, and the filling amount of the double-layer flux core accounts for 20-25% of the total mass of the stainless steel flux-cored wire; the double-layer flux core comprises a rapid reaction layer and an alloy transition layer, the rapid reaction layer comprises an oil stain oxidizing agent, the oil stain oxidizing agent comprises a high-temperature decomposition type organic matter and an inorganic composition, and the inorganic composition comprises copper oxide and ferric oxide with the mass ratio being (1-1.5): 1. The high-temperature decomposition type organic matter comprises polytetrafluoroethylene micro powder and trisodium citrate according to the mass ratio of 1: (3-5), and the alloy transition layer comprises 316L stainless steel powder, metal powder, silicon powder, niobium carbide and rare earth oxide. The invention can effectively avoid hydrogen embrittlement caused by diffusible hydrogen easily formed by compounds in anti-rust oil remaining on the surface of the welding wire during welding and entering a welding seam.

The invention discloses a preparation method and application of a composite catalyst for preparing aromatic hydrocarbon through hydrogenation of carbon dioxide, the composite catalyst is formed by compounding an iron-based catalyst and an HZSM-5 molecular sieve, the main active components of the iron-based catalyst are Fe3O4 and iron carbide, the preparation method comprises the steps of preparation of modified ferric oxide, preparation of modified ferroferric oxide, preparation of the iron-based catalyst and the like. The preparation method provided by the invention improves the adsorption activation capability of carbon dioxide on the composite catalyst and the anti-poisoning stability of the composite catalyst, and also improves the aromatic hydrocarbon selectivity of the product.

The invention belongs to the field of electrode material recycling, and particularly relates to a method for recycling elements in waste lithium iron phosphate with the assistance of ferric oxide, which comprises the following steps: mixing a waste lithium iron phosphate material and ferric oxide, then carrying out heat treatment in a protective atmosphere, and then carrying out leaching treatment and solid-liquid separation on a heat treatment product, a lithium extracting solution and leaching residues containing iron phosphate and ferrous oxide are obtained; the temperature of the heat treatment is 400 to 700 DEG C; a leaching agent in the leaching stage is water or acid liquor with the concentration being 0.1 M or below. According to the method, ferric oxide is creatively adopted to assist in participating in heat treatment of lithium iron phosphate, so that the crystal structure of lithium iron phosphate can be cracked based on a brand new mechanism, and lithium can be effectively extracted and recycled based on water leaching and ultralow-concentration acid leaching.

The invention belongs to the technical field of metal preparation, and particularly relates to a Fe-Al-Nb alloy and a preparation method thereof. Comprising the following steps: mixing ferric oxide, niobium pentoxide powder and a metal diluent, performing ball milling, and pressing into a green body; and the blank is put into a reaction kettle, then an ignition agent is added, protective gas is inflated, a self-propagating reaction is conducted at the temperature of 260-300 DEG C, and the Fe-Al-Nb alloy is obtained. The Fe-Al-Nb alloy is prepared through the self-propagating reaction, the reaction temperature is reduced, the thermal stress during forming is improved, the temperature of the self-propagating reaction is only 260-300 DEG C, meanwhile, the self-propagating reaction mode is adopted, the alloy is rapidly cooled after reacting, the fine grain strengthening effect is promoted to be more obvious, a microstructure of a Fe3Al matrix phase and a C14 Laves reinforced phase is formed, and the Fe-Al-Nb alloy is obtained. And the distribution of a reinforced phase is more uniform, and the wear resistance of the material is improved.

The present invention relates to a preparation method of a self-propagating anti-corrosion and wear-resistant coating for a boiler water wall, belonging to the technical field of high-temperature protective coatings. The preparation steps are as follows: (1) Aluminum powder, iron(III) oxide powder, chromium oxide powder, zirconia fine powder, alumina fiber, heat-conducting filler and flux are ball-milled and mixed to obtain a mixed powder; (2) The mixed powder and sodium silicate binder are mixed evenly to obtain a suspension slurry; (3) The surface of the boiler water wall is treated by sandblasting; (4) A precoating is made on the surface of the boiler water wall; (5) A sodium silicate layer is made on the precoating; (6) A magnesium strip is ignited to initiate a self-propagating reaction to obtain a protective layer; (7) The protective layer is removed to obtain a self-propagating anti-corrosion and wear-resistant coating on the surface of the boiler water wall. The sodium silicate used as the binder obtains a dense self-propagating anti-corrosion and wear-resistant coating, and the self-propagating anti-corrosion and wear-resistant coating has good thermal conductivity, uniform thickness, excellent mechanical wear resistance and good corrosion resistance.

The invention relates to the technical field of capacitors, and discloses a high-energy-density capacitor which is characterized in that a positive electrode is composed of a composite active material, a conductive agent and a binder, the composite active material comprises a mixture of nitrogen-sulfur co-doped carbon foam magnetic microspheres and iron sesquioxide nanodot at nitrogen-doped graphene, and the conductive agent is a mixture of nitrogen-sulfur co-doped carbon foam magnetic microspheres and iron sesquioxide nanodot at nitrogen-doped graphene. The preparation method of the nitrogen-sulfur co-doped carbon foam magnetic microspheres comprises the following steps: by taking polyacrylonitrile as a carbon source, thiourea as a sulfur source and ferric nitrate as an iron source, carrying out hydrothermal reaction and then carrying out carbonization treatment at 800-1000 DEG C for 2-4 hours; the energy density of the high-energy-density capacitor can reach 700-800 Wh / kg, the power density is larger than or equal to 10 kW / kg, compared with a traditional super capacitor, the high-energy-density capacitor has the advantages that the energy density is remarkably improved, and the application requirements of the fields with high requirements for energy and power such as electric automobiles and intelligent power grids can be met.

The invention belongs to the technical field of environmental science and resource utilization, and relates to a rapid enteromorpha humification method and application, under the action of a catalyst, enteromorpha is humified by a hydrothermal method to obtain an enteromorpha-based bio-organic fertilizer; the catalyst is more than one of nano ferric oxide, nano ferric chloride, nano cuprous chloride and ammonium sulfite. According to the method, rapid humification of the enteromorpha is realized, the high-activity fertilizer is prepared, the pollution problem of the enteromorpha is effectively solved, and resource utilization of the enteromorpha is promoted.

The application provides a weathering steel surface rust layer stabilizing treatment agent for industrial atmospheric environment, and the chemical composition of the weathering steel surface rust layer stabilizing treatment agent is as follows in terms of mass fraction: 25-45% of acrylic resin, 2.0-6.0% of chromium sulfate, 3.0-8.0% of ferrous oxide, 2.0-6.0% of ferric oxide, 0.5-3.5% of copper sulfate, 0.3-1.5% of sodium bisulfite, 1.0-6.0% of sodium molybdate, 0.5-3.5% of nickel sulfate, 2.0-5.0% of potassium phosphate, 0.05-0.5% of surfactant, 0.05-0.5% of defoaming agent, 0.05-0.5% of dispersing agent, 0.05-0.5% of thickening agent, and the balance is water, wherein the amount of plasticizer added is 2-5% of the resin. The stabilizing treatment agent in the application can promote the weathering steel surface to form a stable and dense rust layer within 0.5-1 year after the surface of the weathering steel is treated before use.

The application belongs to the field of metal materials, and discloses a method for preparing porous iron by impregnating organic foam, which comprises the following steps: step 1: impregnating slurry into a polyurethane foam template after roughening, to obtain a slurry-attached foam template; the slurry is an aqueous solution containing water-soluble resin, iron powder, ferric oxide, surfactant and thickening agent; the water-soluble resin contains a curing agent; step 2: performing rolling and drying operations on the slurry-attached foam template obtained in step 1, to obtain a green body; and step 3: performing combustion, reduction and sintering operations on the green body obtained in step 2. By using a foaming surfactant, the foaming effect of the foaming surfactant is utilized to solve the problem of closed pores and increase the porosity, and the water-soluble resin is used in combination, so that the material has certain toughness and tensile strength while the porosity is increased, and the porous iron material with high porosity and high strength is obtained. Meanwhile, the application also discloses a porous iron.

The present invention discloses a wave absorbing patch for a 700MHz 5G base station in the P band, which belongs to the technical field of wave absorbing materials. The wave absorbing patch is made of a ternary magnetic composite absorber and rubber; wherein the ternary magnetic composite absorber includes secondary sintered ferrite, flaky carbonyl iron and flaky iron silicon aluminum; the secondary sintered ferrite includes ferric oxide, zinc oxide, cobalt oxide and barium carbonate. The present invention also provides a method for preparing a wave absorbing patch, comprising the following steps: S1, ferric oxide, zinc oxide, cobalt oxide and barium carbonate are proportioned, and secondary sintered ferrite is obtained by high-temperature solid phase secondary sintering; S2, secondary sintered ferrite, flaky carbonyl iron and flaky iron silicon aluminum are mixed in proportion by ball milling process to obtain a ternary magnetic composite absorber; S3, the ternary magnetic composite absorber and rubber are proportioned, and subjected to internal refining, open refining, sheeting and high-temperature flat plate vulcanization to obtain a wave absorbing patch.

The invention relates to the technical field of battery positive electrode materials, in particular to a sodium-ion battery positive electrode material with high cycle performance and application of the sodium-ion battery positive electrode material. The preparation method comprises the following steps: by taking multi-layer graphene as a substrate, coating the multi-layer graphene with polydopamine, chemically depositing iron trioxide particles on the surface of the multi-layer graphene, mixing the multi-layer graphene with sodium dihydrogen phosphate, glucose, a chromium doping agent and / or a vanadium doping agent to obtain a raw material, grinding and calcining at a high temperature to obtain the chromium and / or vanadium doped positive electrode material. The cycle performance and the rate capability of the sodium ion battery prepared from the positive electrode material are improved, and the comprehensive electrochemical performance is excellent.

The invention provides a dark metal modified lithium orthosilicate-based thermochemical heat storage material as well as a preparation method and application thereof, and belongs to the technical field of energy and material science. The components of the heat storage material comprise lithium orthosilicate and dark metal, the proportion of the dark metal in the heat storage material is 2-10 mol%, and the source of the dark metal comprises one or more of manganese dioxide, ferric oxide, nickel oxide and copper oxide. Metal ions introduced into the obtained dark metal modified lithium orthosilicate-based thermochemical heat storage material have the effects of promoting the ion migration rate and resisting material sintering, and specifically, the heat storage density and the cycling stability of the material are remarkably enhanced. In addition, due to the introduction of the dark metal oxide, the color of the heat storage material is remarkably deepened, the solar spectrum absorptivity is greatly improved, the light absorption performance of the material is greatly enhanced, and the heat storage material has higher photo-thermal conversion efficiency and is more suitable for a concentrating solar energy storage system.

The invention belongs to the technical field of electrocatalytic nitrate reduction catalysts, and particularly relates to a graded porous hollow carbon fiber catalyst with synergistic monatomic iron and ferric oxide clusters as well as a preparation method and application of the graded porous hollow carbon fiber catalyst. The preparation method specifically comprises the following steps: stirring polyacrylonitrile and polymethyl methacrylate in an organic solvent to obtain a spinning precursor solution; the preparation method comprises the following steps: taking ferrous sulfate heptahydrate and 1, 10-phenanthroline as ligands, and stirring in an organic solvent to obtain a metal organic ligand; the preparation method comprises the following steps: stirring a spinning precursor solution and a metal organic ligand, obtaining a metal precursor-loaded composite fiber through an electrostatic spinning technology, and then carrying out pre-oxidation and high-temperature pyrolysis to obtain the composite fiber. The prepared carbon fiber has good conductivity and a unique hollow hierarchical porous structure, transmission of reactants is greatly promoted while more active sites are exposed, the carbon fiber serves as a monatomic synergistic cluster catalyst carrier, rapid transmission of electrons is facilitated, and the electro-catalysis efficiency is effectively improved.

The invention provides a method for determining the content of multiple components in stuffing sand, which comprises the following steps of: performing component analysis on the stuffing sand by adopting a mode of combining melting sample preparation and X-ray fluorescence method fuse piece analysis, fitting a standard sample piece correction working curve, performing repeatability and reproducibility tests, determining the applicability of the method, and determining the content of multiple components in the stuffing sand. And performing component analysis on the to-be-detected stuffing sand sample wafer by using an X-ray fluorescence method to obtain the stuffing sand sample wafer. According to the present invention, the component analysis is performed on the stuffing sand by combining the melting sample preparation and the X-ray fluorescence method fuse piece analysis, such that the contents of chromium sesquioxide, silicon dioxide, iron sesquioxide, aluminum oxide, zirconium dioxide and other substances in the stuffing sand can be obtained at the one time, and the determination method improves the detection efficiency, and has characteristics of high sensitivity and high accuracy. Fuse piece analysis does not relate to improvement of the particle effect problem in tabletting analysis, and the accuracy is high.

The invention belongs to the technical field of sodium-ion battery manufacturing, and particularly discloses a sodium-ion battery containing a layered oxide sodium material and a manufacturing process of a positive plate of the sodium-ion battery. The manufacturing process of the positive plate of the sodium-ion battery comprises the following steps: mixing sodium carbonate, cobalt sesquioxide, nickel sesquioxide, iron sesquioxide and a D-source metal oxide; mixing with a functional auxiliary agent, and carrying out ball milling and drying to obtain a precursor material; tabletting, roasting, cooling and grinding the precursor material to obtain a layered oxide sodium material; adding the layered oxide sodium material into the treating fluid I, stirring, standing, filtering, drying, spraying the treating fluid II, stirring, drying, and grinding to obtain the positive electrode material; the preparation method comprises the following steps: mixing a positive electrode material with a conductive agent and a binder, adding N-methyl pyrrolidone, defoaming to obtain positive electrode slurry, and coating an aluminum foil with the positive electrode slurry to prepare a positive plate; the sodium ion battery provided by the invention has excellent cycle stability and relatively high specific capacity, and the manufacturing process is simple and convenient to operate.

A drip irrigation emitter includes a cover member, a base member, and a silicone-based membrane containing ferric oxide, the membrane=e located between the two members. The membrane includes liquid silicone rubber (LSR) material and ferric oxide. The ferric oxide in volumetric percentage ranges from about 0.1% to about 0.5% of the overall volume of the LSR material.

The invention relates to a high-quality steel slag aggregate as well as a preparation method and application thereof, the method is a graded carbonization process and comprises the following steps: (1) primary carbonization and reduction: taking molten steel slag at 1300-1500 DEG C as a raw material, continuously introducing industrial waste gas into a hot and stuffy tank in a water spraying and cooling process, carbonizing for 8-14 hours, and reducing for 2-4 hours; meanwhile, ferric oxide in the steel slag is reduced into iron elementary substance and ferroferric oxide, and first-grade carbonized steel slag is obtained; the volume ratio of CO2 in the industrial waste gas is 20%-30%, and the volume ratio of CO in the industrial waste gas is 30%-60%; (2) secondary carbonization: selecting the primary carbonized steel slag below 10mm in the step (1) as aggregate, placing the aggregate in a closed container, spraying the steel slag aggregate according to a preset spraying amount, maintaining the pressure in the closed container to be 0.3-0.5 Mpa, continuously introducing the same industrial waste gas into the closed container for secondary carbonization, and enabling the content of free calcium oxide in the steel slag aggregate to be lower than 3%; and carrying out magnetic separation to obtain high-quality steel slag aggregate after secondary carbonization. According to the method, the high-quality steel slag aggregate meeting related technical requirements can be prepared within 24 hours and is used for preparing asphalt concrete.

The invention discloses a mold casting molten steel covering agent and a preparation method thereof, and the mold casting molten steel covering agent comprises the following components in parts by mass: 50-65 parts of expanded perlite, 6-10 parts of alumina powder, 2-5 parts of magnesium oxide powder, 25-35 parts of calcium oxide powder, 1-2 parts of fluorite powder, 2-5 parts of ferric oxide, 30-40 parts of porous calcium zirconate, 5-10 parts of calcium carbonate powder and 3-5 parts of acidified graphite. According to the invention, the proportion of carbon element and hydrous aluminosilicate in the covering agent is reduced, the recarburization effect on molten steel is reduced, and the oxidation resistance and thermal insulation capacity of the covering agent are improved.

The invention discloses a thermite formula for coating a ceramic layer in a steel pipe and a preparation method of the thermite formula, and relates to the technical field of steel pipe lining metal ceramic, the formula comprises aluminum powder, ferric oxide, silicon dioxide and oxygen, and further comprises copper oxide and diboron trioxide, the content of oxygen is smaller than the amount of oxygen consumed when the aluminum powder is completely oxidized, and the content of silicon dioxide is smaller than the amount of copper oxide consumed when the aluminum powder is completely oxidized. When the oxygen participating in the reaction is exhausted, aluminum which does not participate in the oxidation reaction exists. According to the invention, by adding the diboron trioxide and the copper oxide, a traditional metal ceramic lining steel pipe combined in a mechanical mode can be improved into a metal ceramic inner covering steel pipe combined in a brazing mode, so that the binding force of the inner covering layer and the base pipe is improved, and the surface flatness of the inner covering layer is improved so as to reduce the fluid conveying resistance; the metal ceramic internally-coated steel pipe manufactured through the formula and the specific implementation method has the advantages of being high in bonding force between the internally-coated layer and the base pipe, smooth in surface, resistant to high temperature and high pressure and resistant to corrosion.

The invention relates to the technical field of oilfield chemistry, in particular to a nano-composite viscosity reducer, a preparation method, application and a high-viscosity thick oil viscosity reduction method. According to the preparation method, the nano composite viscosity reducer is prepared from a surface-modified nano oxide and an amphiphilic polymer through a solvent exchange method; the nano oxide is nano silicon dioxide nano particles, zinc oxide nano particles or ferric oxide nano particles, and the amphiphilic polymer is a partial esterification product of a styrene-maleic anhydride copolymer or an octadecyl acrylate-methacrylic acid copolymer. According to the preparation method, the viscosity reducer not only can efficiently disassemble a colloid asphaltene network structure, but also has a certain catalytic modification function, does not influence subsequent treatment of crude oil, and has the advantages of high viscosity reduction efficiency, lasting effect, no formation of stable emulsion, shear resistance, good temperature resistance, strong universality and the like.

The invention discloses a multi-band high-stability ferrite magnetic material composite formula and a preparation process, and relates to the technical field of magnetic materials. The ferrite magnetic material composite formula comprises 38-42 parts of ferric oxide powder, 37-41 parts of ferroferric oxide powder, 6-12 parts of graphene nanosheets, 5-7 parts of hydroxypropyl methyl cellulose, 6-9 parts of lanthanum oxide, 4-6 parts of scandium oxide, 1-3 parts of nano titanium dioxide, 4-6 parts of bismuth magnesium boron, 9-13 parts of ferric sulfate, 3-5 parts of manganese sulfate, 4-6 parts of zinc sulfate, 2-4 parts of copper sulfate and 2-3 parts of samarium sulfate. By utilizing a physical vapor deposition gradient doping process, the problems that an existing ferrite magnetic material is single in electromagnetic performance, cannot stably and efficiently work in a multi-frequency-band complex electromagnetic environment and cannot meet the requirements of the fields of communication, radar, electronic countermeasure and the like for wide-frequency-band and high-performance magnetic materials can be solved.

The application relates to high-quality steel slag aggregate and a preparation method and application thereof, the method is a grading carbonization process, which comprises the following steps: (1) primary carbonization and reduction: taking molten steel slag in a state of 1300 DEG C-1500 DEG C as raw material, continuously introducing industrial waste gas into a hot steaming tank for carbonization in a water spraying cooling process for 8h-14h, meanwhile, making the diiron trioxide in the steel slag be reduced into iron single element and magnetite, and obtaining primary carbonized steel slag; the volume ratio of CO2 in the industrial waste gas is 20%-30%, and the volume ratio of CO is 30%-60%; (2) secondary carbonization: selecting the primary carbonized steel slag below 10mm in step (1) as aggregate, spraying the steel slag aggregate according to a preset spraying amount in a closed container, maintaining the pressure in the closed container as 0.3-0.5 Mpa, continuously introducing the same industrial waste gas into the closed container for secondary carbonization, and making the free calcium oxide content in the steel slag aggregate be lower than 3%; and magnetically selecting the high-quality steel slag aggregate after secondary carbonization. According to the method, the high-quality steel slag aggregate meeting the relevant technical requirements can be prepared within 24h, and is used for preparing asphalt concrete.

The invention discloses a method for detecting the content of iron oxide impurities in brown aluminum oxide. The method comprises the following steps: sampling; preparing a sample solution; obtaining the volume of the sodium thiosulfate solution consumed by the sample solution; obtaining the volume of the sodium thiosulfate solution consumed by the purified water; and determining the percentage content of the iron oxide impurity in the brown aluminum oxide. According to the method for detecting the content of the iron oxide impurity in the brown aluminum oxide, the content of the impurity ferric oxide in the brown aluminum oxide can be simply and quickly detected at very low cost under the conditions that expensive instruments are not used and tedious and complicated operation steps are not needed.

The invention relates to the technical field of waste acid resource utilization, and provides a method for producing iron oxide black and manganese carbonate by using iron-containing waste hydrochloric acid, which comprises the following steps: S1, adding ferrous oxide waste mud into ferrous chloride-containing waste hydrochloric acid, and extracting to obtain an organic phase and a water phase; s2, hydrochloric acid and first manganese oxide mineral powder are added into the 70 wt% water phase, and first filtrate and first filter residues are obtained; s3, adding a first alkaline material into the first filtrate to obtain a ferric oxide and manganous chloride solution; s4, mixing ferric oxide with the remaining water phase, and adding a second alkaline material to obtain iron oxide black; s5, manganese dioxide mineral powder and sodium sulfide are added into the manganous chloride solution, and second filtrate and second filter residues are obtained; and S6, adding sodium carbonate into the second filtrate to obtain a manganese carbonate and sodium chloride solution. According to the technical scheme, the problems of low purity and poor resource utilization effect of the iron oxide black obtained from the iron-containing waste hydrochloric acid in related technologies are solved.

The invention relates to the technical field of photocatalysts, in particular to a magnetic composite photocatalyst for removing antibiotics as well as a preparation method and application of the magnetic composite photocatalyst. The preparation method comprises the following steps: mixing choline chloride, glycerol, ethanol, a magnesium source, an iron source and citric acid, and carrying out complex reaction to obtain sol; adjusting the pH value of the sol, and then heating to form gel; igniting the gel to obtain a precursor; calcining the precursor to obtain the magnetic composite photocatalyst; in the mixing process, the molar ratio of the magnesium element in the magnesium source to the iron element in the iron source is (1-1.6): (1.8-2.4); the molar ratio of choline chloride to glycerol to ethanol is (0.5-1.5): (1.5-2.5): (0.1-0.3). By adopting the method, the magnetic composite photocatalyst composed of magnesium ferrite, magnesium oxide and ferric oxide can be prepared, and the magnetic composite photocatalyst has a relatively good treatment effect on antibiotics, and is high in removal rate and relatively short in removal time.