1485 results about "Iron oxide" patented technology

The invention belongs to the field of metal materials, and particularly relates to a high-strength 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, V, 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 0.006%, and the balance is Fe and inevitable impurities. The yield strength of the steel plate ranges from 498 MPa to 552 MPa, the tensile strength ranges from 608 MPa to 643 MPa, the transverse elongation A ranges from 33% to 38%, the steel plate is qualified after transverse cold bending by 180 degrees D = a, the surface quality is good, oxide scale stripes and chromatic aberration defects are avoided, the surface roughness Ra ranges from 1.10 micrometers to 1.35 micrometers, and the steel plate has excellent corrosion resistance.

The invention discloses an enamel ceramic glaze tile with a metal spot bionic effect and a preparation method thereof, and relates to the technical field of ceramics. The enamel porcelain glaze tile comprises a bottom blank, a metal ground glaze layer and a semi-opaque cover glaze layer, the metal ground glaze layer is prepared from a first ground glaze formula or a second ground glaze formula, and the first ground glaze formula comprises, by mass, potassium feldspar, quartz, calcite, kaolin, talc, zinc oxide, ferric oxide and manganese dioxide; the formula of the second ground glaze comprises the following components in percentage by mass: potassium feldspar, quartz, calcite, kaolin, talc, zinc oxide, ferric oxide and chromic oxide; the semi-opaque surface glaze layer is prepared from the following raw materials in percentage by mass: albite, calcite, talc, burnt soil, zircon powder, oriental zirconium, calcined zinc oxide, black clay powder and calcined aluminum oxide. Through a double-layer glaze structure and a black mud powder glaze breaking mechanism, the stereoscopic visual effect that metal spots are randomly generated on an opacifying substrate is achieved, and meanwhile the Moh's hardness of the ceramic tile is improved.

The invention belongs to the field of metal materials, and particularly relates to a high-elongation 288MPa-grade hot-rolled pickled steel plate for an automobile and a production method thereof. The steel plate is mainly suitable for manufacturing automobile chassis structural parts. The steel comprises the chemical components of C, Si, Mn, Al, Ti, Zr, Ni, Pt and Y, P is limited to be smaller than or equal to 0.015%, S is limited to be smaller than or equal to 0.005%, N is limited to be smaller than or equal to 0.003%, and the balance is Fe and inevitable impurities. The steel plate has excellent mechanical properties, the yield strength of the steel plate is larger than or equal to 238 MPa, the tensile strength is larger than or equal to 288 MPa, the transverse elongation A is larger than or equal to 48%, the hole expansion rate is larger than or equal to 132%, 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 1.08-1.48 micrometers, and the steel plate has good corrosion resistance.

The invention relates to the technical field of material science and engineering, and discloses a nanocellulose-based oil-water separation and adsorption composite material, which is prepared from the following raw materials in parts by mass: 35 to 45 parts of nanocellulose; 8 to 11 parts of bagasse cellulose; 10 to 15 parts of sodium lignin sulfonate; 4 to 8 parts of chitosan; 5-10 parts of oxidized starch; 5 to 8 parts of cellulose nanowhiskers; 2-5 parts of silicon dioxide nanoparticles; 0.5 to 1 part of calcium carbonate nanoparticles; 1-2 parts of a citric acid cross-linking agent; 1-2 parts of graphene oxide; 0.3 to 0.6 part of ethylene diamine tetraacetic acid; 2-5 parts of glycerol; 0.4 to 1 part of stearoyl chloride; 2-4 parts of nano iron oxide; the preparation method comprises the following steps: pretreating the raw materials, mixing the pretreated raw materials into slurry, carrying out crosslinking and ultrasonic dispersion, standing to obtain a basic mixture, injecting the basic mixture into a mold, carrying out freeze drying to form a photocatalytic layer, carrying out centrifugal dewatering, carrying out chelation reaction, spraying a composite solution, and carrying out vacuum drying to obtain the photocatalytic material. The obtained composite material has the advantages of efficient adsorption capacity, good mechanical properties, environmental friendliness, degradability and low preparation cost.

The invention relates to the field of metal processing, and particularly discloses a low-carbon steel oxide scale reduction annealing process and a hot galvanizing process, the low-carbon steel oxide scale reduction annealing process comprises the following steps: S1, pretreatment: firstly carrying out water / abrasive sand blasting treatment on a hot-rolled strip steel substrate, then washing with water, then heating to 650-700 DEG C at a heating rate of 50-60 DEG C / s, and keeping the temperature for 2-3 hours; after heat preservation treatment, taking out and immediately putting into a salt solution to obtain a pretreated base material; s2, reduction annealing: carrying out reduction annealing on the prepared pretreated base material in a reducing gas atmosphere; the hot galvanizing process comprises the following steps: carrying out oxide scale reduction annealing treatment on a hot-rolled strip steel base material; and hot galvanizing is conducted on the hot-rolled strip steel obtained after the oxide scale reduction annealing treatment is conducted in zinc liquid, a zinc coating is formed on the surface of the hot-rolled strip steel, and the hot-galvanized plate is prepared. The method has the characteristics that the oxide scale is effectively reduced, good adhesion of a zinc layer and a substrate is ensured, and the quality of a plating layer is improved.

The invention discloses a production method of ferrous dihydrogen phosphate, which comprises the following steps of: changing an iron source of iron-process iron phosphate from traditional iron blocks or iron powder into oxide scale, compounding phosphoric acid and sulfuric acid into mixed acid, and controlling the granularity of the oxide scale and the components and acidity of the mixed acid to solve the problems of dissolution and passivation of the oxide scale. According to the method, iron oxide scale can be better dissolved, the residual problem of ferric ions is solved by reducing excessive iron blocks or iron powder, undissolved impurities such as carbon, silicon and iron are removed by filtering, and finally, the stability problem of a reaction system is solved by adjusting the pH value of the system through industrial phosphoric acid and pure water, so that a ferrous dihydrogen phosphate solution required for producing iron phosphate is obtained. The production cost of an iron source required by iron phosphate is greatly reduced, other impurities are not contained, and mixed acid-containing filtrate and washing water generated in the production process can be recycled through an evaporation device.

The invention belongs to the technical field of sewage treatment, and discloses an anaerobic ammonia oxidation enhanced denitrification device and method based on an electron mediator type biological carrier and iron oxide. The anaerobic ammonia oxidation enhanced denitrification device comprises a reactor main body, a heat preservation circulating water device, a stirring device, a water inlet pipeline and a water outlet pipeline, anaerobic ammonium oxidation bacteria are contained in the reactor main body, a certain proportion of electron mediator type biological carriers are filled in the reactor, and a proper amount of iron oxide is added; wherein the added high-valence iron oxide can be used as an extracellular electron acceptor of anaerobic ammonium oxidation bacteria, the electron mediator type carrier can be used as a redox mediator, and nitrogen removal of the anaerobic ammonium oxidation system is promoted by strengthening the extracellular electron transfer process of the anaerobic ammonium oxidation bacteria.

The invention relates to the field of coating materials, and provides an antiskid coating based on carbon fibers and a preparation method thereof. The coating is composed of a component A and a component B, the component A comprises KH-570 silane coupling agent surface modified carbon fibers, dog bone-shaped nano silicon dioxide, epoxy modified hydroxy acrylic resin, quartz sand antiskid aggregate, propylene glycol methyl ether acetate, iron oxide pigment and other auxiliaries, and the component B is an HDI tripolymer curing agent. The surface modified carbon fiber is prepared through the steps of cleaning and activating, silane coupling agent dipping, drying and curing and the like, and the dog bone-shaped nano silicon dioxide is prepared through a sol-gel method with hexadecyl trimethyl ammonium bromide and polyvinylpyrrolidone as morphology guiding agents. The preparation method comprises the steps of iron oxide color paste preparation, functional component dispersion, quartz sand addition, curing treatment, double-component mixing and curing and the like. The coating has excellent dry skid resistance, wet skid resistance, wear resistance and durability, and is suitable for the field of ground skid resistance coating.

A full-continuous short-process production method for a metal plate strip comprises the steps of smelting, tundish induction heating, thin strip continuous casting, rolling, 1 # flying shearing, cooling after rolling, acid-free descaling, 2 # flying shearing and strip steel coiling, and a steel coil without oxide scale on the surface is obtained. The metal plate strip comprises the following components in percentage by weight: 0.01-0.06% of C, less than or equal to 0.15% of Si, less than or equal to 0.85% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S and Alslt; 0.001%, less than or equal to 0.0050% of Ca, and the balance Fe and other unavoidable impurities. The method comprises the following steps: carrying out on-line hot rolling on a cast strip cast by double rollers through an on-line six-roller mill, and carrying out an acid-free descaling process to obtain a steel coil without oxide scale on the surface. Products produced through the method are high in ductility, good in forming performance and high in surface quality, and the purpose that cold is replaced by hot in the field of high-end products can be truly achieved.

The invention relates to an iron oxide homogeneous and heterogeneous photoelectric self-Fenton electrode material as well as a preparation method and application thereof, the self-Fenton electrode material comprises a carbon fiber cloth matrix and an active alpha / beta-Fe2O3 homojunction grown on the carbon fiber cloth in situ, and the structure of the self-Fenton electrode material is shown as alpha / beta-Fe2O3 / CC. The alpha / beta-Fe2O3 homojunction is formed by compounding two phases, namely, alpha-Fe2O3 and beta-Fe2O3. And the alpha / beta-Fe2O3 / CC has an oxygen vacancy. The preparation method comprises the following steps: soaking a pretreated carbon fiber cloth substrate in an alpha / beta-Fe2O3 precursor solution prepared in advance for reaction, and after the reaction is finished, carrying out post-treatment to obtain FeOOH / CC; calcining the FeOOH / CC, and cooling to obtain alpha / beta-Fe2O3 / CC; the alpha / beta-Fe2O3 / CC can introduce oxygen vacancies through reduction activation treatment of a sodium borohydride aqueous solution. Compared with the prior art, H2O2 can be generated in situ, sustainable circulation from Fe < 3 + > to Fe < 2 + > is enhanced, generation of hydroxyl radicals in the self-Fenton reaction is promoted, and the degradation reaction speed and efficiency of organic pollutants, especially antibiotics are greatly improved.

The invention discloses a sludge treatment process based on an ultrasonic hydrothermal carbonization technology. The sludge treatment process comprises the following steps: intercepting and filtering out large impurities in biological sludge; carrying out solid-liquid separation on the intercepted sludge, and carrying out concentration treatment on the sludge to obtain concentrated sludge; discharging the concentrated sludge into an ultrasonic hydrothermal carbonization reaction kettle, adding water to adjust the concentration of the concentrated sludge to 10-20%, starting an ultrasonic generator, adding a composite catalyst when the temperature in the ultrasonic hydrothermal carbonization reaction kettle reaches 50 DEG C and the pressure reaches 0.8 Mpa, and converting to generate carbon slurry; wherein the composite catalyst is prepared from ferric oxide, platinum and activated carbon according to a preset proportion; carrying out primary solid-liquid separation on the carbonaceous slurry, separating solid-phase carbon mud and liquid-phase carbon mud in the sludge suspension, and carrying out filter pressing on the solid-phase carbon mud to obtain a mud cake; and drying the mud cake, and granulating in a granulator to obtain the hydrothermal carbon granules. According to the sludge treatment process based on the ultrasonic hydrothermal carbonization technology, the sludge treatment difficulty can be effectively reduced, and the sludge can be quickly treated.

The invention relates to the technical field of cement-based material preparation, and particularly discloses a preparation method of an anti-carbonization all-solid waste slag-sulphoaluminate cementing material, which comprises the following steps: (1) putting a wet material formed by lead-zinc tailing powder and water into a reaction container, sealing, and heating; and mixing the obtained product with iron powder and / or iron oxide powder and water, stirring, separating out a solid product, and heating and drying in an air atmosphere to obtain the anti-carbonization tailing powder. And (2) mixing the anti-carbonization tailing powder with sulphoaluminate cement powder, and carrying out mechanical grinding treatment to obtain the modified sulphoaluminate cement. And (3) uniformly mixing blast furnace slag powder, the modified sulphoaluminate cement, fly ash, waste gypsum powder, an alkali activator, gypsum and a water reducing agent serving as raw materials to obtain the cementing material. According to the invention, the resource utilization of industrial solid waste is realized, the carbonization resistance of the cementing material is effectively improved, and the service durability of the cementing material is improved.

The invention discloses a slow-release phosphate fertilizer as well as a preparation method and application thereof. Iron-phosphorus compound fertilizer is prepared by generating an iron oxide coating on the surface of the phosphate fertilizer through iron mineral precipitation. Wherein the iron oxide coating can prevent the phosphate fertilizer from absorbing moisture, reduce volatilization loss of phosphorus and realize controlled release of the phosphate fertilizer, the problems of phosphate fertilizer failure and excessive phosphorus loss are solved, and in addition, the coated iron ore used for synthesizing the compound fertilizer can supplement trace element iron in soil after being dissolved, so that the nutrition of the soil is improved. The invention further provides application of the slow-release phosphate fertilizer, along with dynamic changes of soil environment humidity and oxidation-reduction conditions, ferrous oxidation mineralization and phosphorus dissolution release on the surface of the controlled-release fertilizer have high controllability, the anaerobic-aerobic environment on the surface of the compound fertilizer can be changed through flooding-drainage, and the controlled-release intelligent phosphate fertilizer is formed; the controlled-release fertilizer is driven by water, the form change of iron in different environments is taken as a switch, the application method is simple, no influence is caused to the environment, and the controlled-release fertilizer is suitable for large-scale agricultural operation.

The invention relates to the technical field of steel rolling, and discloses a Q355B steel hot rolling process optimization method based on dynamic temperature control, which comprises the following steps: blank pretreatment, dynamic heating control, high-pressure water descaling, rough rolling process, finish rolling process, laminar cooling and coiling process. According to the method, a collaborative system of multi-section variable-temperature heating and intelligent temperature control is constructed, temperature distribution in a furnace and the heating rate are monitored and dynamically adjusted in real time, it is guaranteed that the core surface temperature of a plate blank is uniform and consistent, thermal stress and the internal crack tendency in the heating process are eliminated, and a high-temperature blank uniform in structure and stable in performance is provided for follow-up rolling; meanwhile, the high-pressure water descaling system optimizes jet flow parameters and introduces chemical additives, so that a protective layer is formed while oxide scales on the surface are removed, the surface cleanliness and quality of the plate blank are improved, and product defects caused by incomplete descaling and surface damage are avoided.

The invention relates to a flue gas circulation waste heat utilization type steel mill solid waste treatment process, which specifically comprises the following steps: mixing a solid waste raw material with fuel, pretreating, feeding into a rotary kiln, reacting in the rotary kiln to generate first flue gas, cooling the first flue gas, and purifying in a desulfurization process to form second flue gas, the third flue gas enters a cooling section of the rotary kiln, and iron-containing materials in the rotary kiln are cooled to form fourth flue gas; the fourth flue gas and the first air enter the second waste heat utilization device and then are subjected to non-contact heat exchange to form fifth flue gas, the first air is subjected to heat exchange through the second waste heat utilization device to form second air, the second air and the gas fuel enter the high-temperature calcination section of the rotary kiln to be combusted to form the first flue gas, and therefore cyclic utilization is achieved. And the third flue gas is adopted as the cooling flue gas to cool the high-temperature iron-containing material in the cooling section of the rotary kiln, so that the problem that the zero-valent iron reduced by the rotary kiln is easily oxidized into iron oxide again is solved.

The invention discloses a device and a method for regenerating a powdery iron oxyhydroxide desulfurizer and purifying sulfur, and the device and the method are characterized in that invalid iron oxyhydroxide is completely reduced into a ferrous oxide and ferrous sulfide after sulfide is added, the reaction of an iron compound is enhanced through ultrasound and stirring, and the separation of the iron compound and the sulfur is promoted. Further fully aerating to fully oxidize the ferrous iron to generate new iron oxyhydroxide; at the moment, the iron oxyhydroxide is in a completely dispersed state, the single particle size is not higher than 1 micron, and small flocs with the particle size of 0-5 microns are formed in laminar water; the surface of the sulfur has hydrophobicity, and the sulfur is gathered to generate hydrophobic self-flocculation, so that large flocs with the particle size of 30-300 microns are formed in the laminar water; the mixture is flushed by water flows with different flow speeds, the iron oxyhydroxide with small particle size is flushed out at a certain flow speed, and the sulfur with large particle size is suspended in the grading pipe, so that the regeneration of the iron oxyhydroxide desulfurizer and the purification of the sulfur are realized.

Provided is a hydrogen sulfide removing agent that can be stably used while maintaining hydrogen sulfide removing ability equivalent to that of a hydrogen sulfide removing agent comprising an amorphous iron oxyhydroxide. This iron oxyhydroxide-based hydrogen sulfide removing agent contains amorphous iron oxyhydroxide and a crystalline component. The content of the amorphous iron oxyhydroxide is not less than the content of the crystalline component.

The invention relates to the technical field of lost foam casting, in particular to a lost foam composite coating, the lost foam composite coating takes a refractory material of an investment casting regenerated shell membrane as a refractory aggregate, the refractory aggregate comprises mullite and a mixture containing an inorganic preservative A and a sintering stripping material B, and one or more of quartz powder and graphite are selected. In the invention, an efficient anti-corrosion additive with sintering stripping is researched and developed as a refractory material auxiliary additive, and meanwhile, low-price refractory materials such as regenerated mullite and recycled quartz powder are utilized to form the lost foam coating aggregate, so that the selection of traditional refractory aggregate is broken through, and the reutilization of waste resources is realized; the environment pollution is reduced while the raw material cost is reduced, meanwhile, the aggregate performance is optimized by adding the raw materials such as calcium oxide and iron oxide red, and the comprehensive performance such as air permeability, suspension stability, high-temperature strength and toughness of the coating is remarkably improved through reasonable matching of the composite binder.

The invention provides a method for preparing high-purity titanium from ferrotitanium complex ore, and relates to the technical field of nonferrous metallurgy. The method comprises the following preparation steps: calculating and adding a carbonaceous reducing agent according to the components of the ferrotitanium complex ore and a specific principle, mixing and pelletizing, and reducing to generate a Fe (alloy)-TiC-MOx mixture; according to the content of TiC and Fe in the mixture, adding metal iron powder and Fe2O3 or iron ore concentrate according to a certain stoichiometric ratio, mixing, pelletizing, and reducing to obtain a titanium-iron alloy; and the obtained ferrotitanium alloy serves as a soluble anode, and high-purity titanium is prepared through electrolysis in halide molten salt containing low-valence titanium salt. According to the method, the reaction characteristic of iron and iron oxide with TiC at high temperature is utilized, the ferrotitanium alloy is generated from the ferrotitanium complex ore to serve as the soluble anode, then the high-purity titanium is prepared through molten salt electrolysis, the adverse effects of component deviation and anode precipitates existing in the soluble anode containing the titanium compound are avoided, and meanwhile casting forming is easy, and the method is more suitable for industrialization.

The invention belongs to the field of iron and steel smelting, and relates to a method for eliminating stripes on the surface of a duplex stainless steel S32205 cold coil, which eliminates the stripe defect on the surface of the duplex stainless steel S32205 cold coil, ensures that the cold coil leaves a factory with a high-quality qualified surface, and meets the requirements of special fields. According to the technical scheme, the method comprises the steps that a duplex stainless steel casting blank with the thickness of 160-200 mm is ground, the grinding pressure is adjusted to be minimum, the grinding current is 10-50 A, the advancing speed of a trolley is 10-50 m / min, the surface roughness after grinding is 40-100 microns, and the surface after grinding is free of iron oxide scale residues generated by grinding.

The invention discloses a method for reducing pulverization and peeling of oxide scale on the surface of hot-rolled high-strength wheel steel, and belongs to the technical field of steel rolling. The method comprises the steps of casting blank heating, descaling after a heating furnace, rough rolling, high-pressure water descaling before finish rolling, finish rolling, cooling and coiling. In the finish rolling procedure, the finish rolling inlet temperature is smaller than or equal to 1010 DEG C, cooling water ISC between racks of F1 to F4 is opened, the water amount is 30% to 60%, the finish rolling temperature is 830 DEG C to 850 DEG C, and the finish rolling threading speed Vt is determined according to the thickness h of a finished wheel steel product: when h is smaller than or equal to 5 mm, Vt is larger than or equal to 5.5 m / s; and when h is greater than or equal to 10mm, Vt is greater than or equal to 3.1 m / s. According to the method, the eutectoid reaction of the scale on the surface of the strip steel is controlled through the hot rolling process, so that the structure of the scale is controlled, the final microstructure of the scale is a compact structure, and the problem that the scale is pulverized and peeled off is effectively solved.

The invention discloses a durable modified epoxy resin composite coating and a preparation method thereof. The durable modified epoxy resin composite coating comprises a component A and a component B, the component A comprises the following components in parts by mass: 100 parts of epoxy resin, 15 parts of mica, 20 parts of glass flakes, 10 parts of mica iron oxide, 5 parts of zinc phosphate, 3 parts of a penetrant and 10 parts of a solvent; the component B is prepared from the following components in parts by mass: 20 parts of doped polyaniline, 100 parts of N-methyl pyrrolidone and 30 parts of a modified amine curing agent. The prepared durable modified epoxy resin composite coating provides more durable surface protection for concrete structures of expressways and bridges, the salt freezing resistance and chloride ion corrosion resistance of the concrete structures subjected to modified epoxy resin surface treatment can be remarkably improved, and the durability of the concrete structures is enhanced.

The invention discloses a high-toughness grouting material and a preparation method thereof, and belongs to the technical field of building materials. The photochromic thermal insulation material is prepared from the following raw materials in percentage by mass: 30 to 36 percent of sulphoaluminate cement, 28 to 32 percent of quartz sand, 0.4 to 0.9 percent of nano graphene / carbon tube hybrid, 12 to 15 percent of superfine composite admixture, 1.0 to 1.8 percent of temperature-sensitive shape memory alloy fiber, 1.5 to 2.0 percent of microbial self-repairing capsule, 15 to 18 percent of photochromic epoxy hybrid emulsion, 0.2 to 0.35 percent of polycarboxylate superplasticizer and 0.8 to 1.2 percent of magnetic iron oxide coated SiO2 expanding agent. According to the invention, the active inhibition that the crack width is less than or equal to 0.05 mm is realized through the shrinkage compensation of the magnetic field oriented expanding agent, the temperature-sensitive fiber phase change toughening and the photochromism-microorganism synergistic repair.

The invention discloses a three-dimensional porous graphene / ferric oxide electromagnetic shielding composite film and a preparation method thereof, and belongs to the technical field of functional composite materials. In order to reduce or eliminate electromagnetic radiation, the three-dimensional porous rGO / Fe3O4 composite material is prepared by taking nano Fe3O4 and GO as raw materials and adopting a graphene oxide reduction self-assembly nanoparticle capturing method. The porous 3D rGO / Fe3O4 composite electromagnetic shielding material is obtained by mixing a dispersing agent and Fe3O4, adding the mixture into a graphene oxide dispersion liquid and capturing nano Fe3O4 through a graphene oxide reduction self-assembly process. Drying the 3D rGO / Fe3O4, and then mixing the 3D rGO / Fe3O4 with waterborne polyurethane to prepare an rGO / Fe3O4 / waterborne polyurethane composite coating; and coating the slurry on a base material to prepare the rGO / Fe3O4 electromagnetic shielding film. The preparation process is simple and easy to control, and raw materials are low in cost, easy to obtain and environmentally friendly; the graphene-based composite electromagnetic shielding material which is light in weight, high in strength, good in stability, good in flexibility and high in electromagnetic shielding efficiency can be prepared at present.

The invention discloses a quick-dry salt-spray-resistant industrial water-based paint and a preparation method thereof, and relates to the technical field of paints. Cerium zirconium oxide is used for preparing nanofiber filler, cellulose is added into a precursor of the nanofiber filler, a carbon substance is obtained through calcination, then the mechanical property of the filler is enhanced, and an interpenetrating network structure with cerium oxide-zirconium oxide particles as nodes is formed in a hybrid material, so that the mechanical property of the coating is enhanced; then the ionic liquid is adsorbed on the carbon substance, then the nano filler is effectively modified, the mechanical property and corrosion resistance of the filler are improved, cerium oxide can inhibit the metal corrosion process, and in the later stage of corrosion prevention operation, cerium oxide and iron oxyhydroxide form a compact and stable surface rust layer structure, the corrosion rate is effectively decreased, and the corrosion resistance of the nano filler is improved. Zirconium oxide can greatly eliminate local micro-current corrosion of carbon substances and metal, and the corrosion resistance of the coating is further enhanced.

The invention provides a black aluminum oxide ceramic material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing aluminum oxide, magnesium oxide, silicon dioxide, iron oxide, manganese oxide, chromium oxide and a solvent to obtain an aluminum oxide ceramic mixed solution; (2) mixing the alumina ceramic mixed solution with a binder, and grinding to obtain alumina ceramic powder; and (3) carrying out cold pressing treatment on the aluminum oxide ceramic powder, and carrying out vacuum pressureless sintering treatment to obtain the black aluminum oxide ceramic material. The black aluminum oxide ceramic material prepared by the method disclosed by the invention is relatively small in crystal grain, relatively small in pore and relatively high in density, and has relatively high compactness and thermal conductivity.

The invention relates to the field of nano-coatings, in particular to a nano-coating for decomposing dirt on a photovoltaic panel based on a photocatalysis technology, the nano-coating is composed of a bottom layer and a self-cleaning layer, and the bottom layer is made of nano-silver; the self-cleaning layer comprises 60 to 70 parts of titanium dioxide nanoparticles, 10 to 20 parts of zinc oxide nanoparticles, 5 to 10 parts of ferric oxide nanoparticles, 5 to 10 parts of zirconium dioxide nanoparticles, 60 to 120 parts of a solvent, 1 to 3 parts of a dispersing agent, 0.5 to 1.5 parts of a thickening agent and 1 to 3 parts of an antirust agent; the bottom layer and the self-cleaning layer are creatively added on the outer side of the photovoltaic panel, the basic bottom layer has good conductivity, antibacterial property and corrosion resistance, the self-cleaning layer can effectively keep transparency of photovoltaic glass on the surface of the photovoltaic panel by constructing concave-convex structure roughness below 50nm, and the self-cleaning layer has good anti-corrosion performance. And the nanometer coating can effectively decompose organic matter dirt on the surface of the photovoltaic panel under the illumination condition, the cleaning frequency is reduced by 80% or above, and the manual operation and maintenance amount is reduced.

A strengthening method for aerobic co-compost of kitchen waste anaerobic biogas residues and hermetia illucens feces belongs to the technical field of organic solid waste treatment, and the specific scheme comprises the following steps: step 1, uniformly mixing kitchen waste biogas residues, hermetia illucens feces and auxiliary materials to obtain a mixed material I; step 2, adding tea leaf residues and iron oxide into the mixed material I, and uniformly mixing to obtain a mixed material II, and step 3, carrying out aerobic composting on the mixed material II until the temperature rise period, the high-temperature period, the cooling period and the decomposition period of a compost body are normally completed. On the basis of a biogas residue-fecula aerobic co-composting system, by adding the tea leaf residues and the iron oxide, the content of humus precursor substances is increased, and conversion of the precursor substances to humus is promoted, so that formation of humic acid is facilitated, the fertilizer efficiency and application potential of a composting product are improved, and meanwhile nitrogen loss in the composting process is reduced.

The invention relates to a steel surface treatment pickling waste liquid recovery treatment method, and belongs to the technical field of steel pickling waste liquid treatment. The method comprises the following steps: adding hydrochloric acid into the pickling waste liquid to adjust the pH value, introducing oxygen and a catalyst, adding a modified adsorbent, stirring, evaporating and concentrating, adding a stabilizer into a concentrated solution, dropwise adding hydrochloric acid to adjust the pH value to generate polyferric chloride colloid, diluting the polyferric chloride colloid, and filtering to remove impurities to obtain a liquid polyferric chloride product. By optimizing oxidation, evaporation concentration and polymerization reaction processes, efficient recovery of waste acid is achieved, high-purity polyferric chloride is prepared, an iron oxide-carbon composite material oxidation catalyst is prepared from ferric salt and graphene, the catalytic efficiency is improved, mesoporous silica is modified by adopting sulfydryl and amino jointly, and high-purity polyferric chloride is obtained. High-selectivity adsorption on heavy metal under the low-pH condition is achieved, the pickling waste liquid generated in the steel surface treatment process is effectively treated, environmental pollution is reduced, polyferric chloride with the high additional value is recycled and generated, and cyclic utilization of resources is achieved.

The utility model belongs to the technical field of cleaning of oxide scales on the surfaces of steel billets, and discloses equipment for cleaning and recycling oxide scales of steel-making steel billets, which comprises two side plates, a steel billet roller way is arranged between the two side plates, and a fixed support is fixedly mounted at the top ends of the two side plates. An electric push rod is fixedly installed in the fixed support, the output end of the electric push rod is fixedly connected with a supporting frame, a first steel wire roller is rotationally connected between the inner walls of the supporting frame, movable frames are symmetrically and slidably installed in the two side plates, and steel plates are fixedly connected to the opposite ends of the two movable frames. The first steel wire roller and the second steel wire roller are designed above the steel billet roller way, so that the high-temperature-resistant first steel wire roller and the high-temperature-resistant second steel wire roller are in rolling contact with steel billets in the steel billet conveying process of the steel billet roller way, oxide scales on the steel billets are removed, and the subsequent steel billet machining quality and efficiency are guaranteed.