2156 results about "Iron oxide" patented technology

A magnetic recording medium of the present invention includes a non-magnetic substrate, and a magnetic layer containing a magnetic powder. The magnetic powder is constituted by an ε-iron oxide powder. The magnetic layer has a squareness in a thickness direction of 0.65 or more. In a differential curve obtained by differentiating a hysteresis curve in the thickness direction of the magnetic layer, two or more peaks are present. In a case where, out of peaks in the same direction among the above-described peaks, a local maximum of a largest peak in a magnetic field range of +500 oersted [Oe] or more is taken as P1 and a local maximum of a largest peak in a magnetic field range of −500 oersted [Oe] or more and less than +500 oersted [Oe] is taken as P2, a relationship below is satisfied:

0.25≦P2/P1≦0.60.

The invention discloses an unsaturated hydrocarbon hydrogenation catalyst which comprises a carrier, an active component and an additive; the active component is a mixture of nickel oxides and other metal oxides; the additive is at least two out of magnesia oxide, lanthanum oxide and ceria; counted by weight percentage, the unsaturated hydrocarbon hydrogenation catalyst comprises 5-15% of nickel oxides, 1-10% of other metal oxides, 1-10% of additive and remaining quantity of carrier; and the metal oxide is one or more oxides out of molybdenum oxide, cobalt oxide and ferric oxide. The invention also discloses a preparation method and applications of the unsaturated hydrocarbon hydrogenation catalyst. The unsaturated hydrocarbon hydrogenation catalyst has the advantages of high hydrogenation precision, strong side effect resistance, good thermal stability, long service life and the like, can be used for processing tail gas in indirect coal oil production industrial and can be also used for processing unsaturated hydrocarbon in synthesis gas.

The present invention relates to nano structures of metal oxides having a nanostructured shell (or wall), and an internal space or void. Nanostructures may be nanoparticles, nanorod/belts/arrays, nanotubes, nanodisks, nanoboxes, hollow nanospheres, and mesoporous structures, among other nanostructures. The nanostructures are composed of polycrystalline metal oxides such as SnO2. The nanostructures may have concentric walls which surround the internal space of cavity. There may be two or more concentric shells or walls. The internal space may contain a core such ferric oxides or other materials which have functional properties. The invention also provides for a novel, inexpensive, high-yield method for mass production of hollow metal oxide nanostructures. The method may be template free or contain a template such as silica. The nanostructures prepared by the methods of the invention provide for improved cycling performance when tested using rechargeable lithium-ion batteries.

The invention discloses a heavy metal absorbent and a preparation method and use thereof. The heavy metal absorbent is prepared by using an inorganic mineral modified by a surfactant as a carrier and loading organic complexing agent on the carrier, wherein the inorganic mineral is bentonite, kaolin, kieselguhr, zeolite, aluminum oxide or iron oxide; the surfactant is cationic surfactant or nonionic surfactant; and the organic complexing agent is a compound containing a sulfydryl and an amino. The heavy metal absorbent has the advantages of stable performance, environment friendliness, high absorption capacity, high selectivity, convenient post-recovery treatment and the like. The absorption capacities of cadmium, mercury lead and other heavy metals all exceed 100mg/g, and the heavy metal absorbent can achieve good treatment effect in treatment of water and soil environments polluted by heavy metals.

A composition comprising at least one graphene-supported metal oxide monolith, said monolith comprising a three-dimensional structure of graphene sheets crosslinked by covalent carbon bonds, wherein the graphene sheets are coated by at least one metal oxide such as iron oxide or titanium oxide. Also provided is an electrode comprising the aforementioned graphene-supported metal oxide monolith, wherein the electrode can be substantially free of any carbon-black and substantially free of any binder.

The invention relates to a preparation method of a hollow mesoporous silica nanoparticle. The preparation method comprises the following steps: obtaining a polymer-silica composite nanoparticle having a core-shell structure by adopting spherical aggregations of an amphiphilic segmented copolymer in an aqueous solution and a cationic surfactant hexadecyl trimethyl ammonium bromide as double templates and ethyl orthosilicate as a silicon source and by hydrolyzing the silicon source under an alkaline condition; and calcining to remove the templates to obtain the hollow mesoporous silica nanoparticle. The preparation method has the advantages of simplicity, mild reaction condition, and cheap experiment raw materials, and the prepared mesoporous silica nanoparticle has the advantages of high specific surface area, high pore volume, and good biological compatibility. The hollow structure enables the drug loading amount to be substantially improved, nanometer gold, nanometer silver, magnetic iron oxide particles, quantum dots, a contrast agent and the like to be loaded, so the hollow mesoporous silica nanoparticle can be used as a targeting drug release carrier, can be used for magnetic resonance image analysis, and has good application prospects in the fields of the diagnosis and the treatment of cancers.

The invention discloses a composite passivant for soil polluted by heavy metal and a preparation method thereof. The composite passivant is prepared by three raw materials of power plant slags, sepiolite mineral powder and calcined lime in proportion. The preparation method comprises the following steps: A. preparing the power plant slags; B. preparing the sepiolite mineral powder preparation; and C. evenly mixing the raw materials prepared by steps A and B with the calcined lime, wherein the mixture is the composite passivant. By utilizing the composite passivant, the contents of the effective constituents, such as silicon oxide, magnesium oxide, calcium oxide, ferric oxide and the like lowering the soil heavy metal activity is 78.2-90.6% which is calculated by the sum of SiO2, MgO, CaO, MnO2 and Fe2O3; the composite passivant can be widely used in various soils polluted by the heavy metal, especially the soil with visco-weight texture; and by using the composite passivant, the contents of cadmium and lead in a soil active state in the pollutant farmland are lowered by 15.9-48.4% and 26.2-56.4% respectively; the contents of the cadmium and the lead of agricultural products are lowered by 13.6-43.9% and 22.1-53.2% respectively; and the soil pH value is also improved by 0.21-0.46%. The composite passivant has various functions of passivating soil heavy metal, repairing acidification soil and improving the soil tilth and the like.

The present invention provides a process for making activated carbon having BET surface area upto 2000 m²/g with pore diameter in the range 17-21 Å suitable for fabricating fuel cell and ultracapacitor electrode from coconut shell by treating carbon granules obtained from coconut shells with chemical activating agents like zinc chloride or potassium hydroxide at the room temperature range 500-800° C. in a dynamic flow of gases like N₂ or CO₂ for 6-24 h followed by a specific cooling pattern to room temperature. Use of such activated carbon enables the fabrication of high performance ultracapacitor electrodes in H₂SO₄ as exemplified by capacitance values like 180 F/g without the use of any normal metal additives such as RuO₂ or IrO₂.

The present invention is to provide a high transmittance glass sheet that has a composition containing as coloring components, expressed in wt. %, 0.005 to less than 0.02% of total iron oxide in terms of Fe₂O₃, less than 0.008% of FeO, and 0 to 0.25% of cerium oxide and having a ratio of FeO in terms of Fe₂O₃ to the total iron oxide of lower than 40%, and exhibits high visible light transmittance and solar radiation transmittance. Alternatively, a high transmittance glass sheet is provided that contains not more than 0.06% of total iron oxide and 0.025 to 0.20% of cerium oxide and has a ratio of a fluorescence intensity at 395 nm to a fluorescence intensity at 600 nm of 10% or higher when subjected to ultraviolet irradiation at a wavelength of 335 nm.

A process for the catalytic oxidation of sulfur and nitrogen contaminants as well as unsaturated compounds present in a hydrocarbon fossil oil medium is described, the process comprising effecting the oxidation in the presence of at least one peroxide, at least one acid and a pulverized raw iron oxide. The process shows an improved oxidation power towards the contaminants typically present in a fossil oil medium, this deriving from the combination of the peroxy-acid and the hydroxyl radical generated in the reaction medium due to the presence of an iron oxyhydroxide such as a limonite clay, which bears a particular affinity for the oil medium. The process finds use in various applications, from a feedstock for refining until the preparation of deeply desulfurized and deeply denitrified products.

The invention discloses a nano-compound adsorbent for efficiently removing trace phosphorus, arsenic and antimony from a water body, belonging to the technical field of environment functional materials. The organic framework of the nano-compound adsorbent of the invention is hypercrosslinked styrene-divinylbenzene ion exchange resin, a functional group for surface binding of the organic framework is a quaternary ammonium group or pyridyl, nano-inorganic functional particles are loaded, and the total volume of 1-20nm nano-pores accounts for greater than or equal to 90% of the total volume of all the pores of the organic framework. The nano-inorganic functional particles are nano-hydrated ferric oxide or nano-hydrated manganese oxide. The nano-compound adsorbent of the invention has more obvious nano effect, strong reaction activity, great adsorption capacity and high selectivity, well solves the defects of obvious swelling, weak adsorption reaction activity, small adsorption capacity, lower adsorption selectivity and the like of the existing nano-compound adsorbent, and is more suitable for advanced treatment of micro-pollution of water and waste water.

The invention relates to a method for extracting copper of a PCB acid etching waste liquid and preparing polyferric chloride, which comprises the following steps: the PCB acid etching waste liquid is electrolyzed directly and copper powder precipitated by electrolysis is reclaimed; reduced iron is added into a mixed solution after the electrolysis and copper sponge precipitated by replacement reaction is reclaimed; claimed crude copper is purified and prepared into copper powder products; the mixed solution after replacement reaction is added with ferric oxide or a substance containing Fe irons; the mixed solution mingled with the Fe irons is added respectively with a polymeric antioxidant and a stabilizer and simultaneously, the pH value of which is regulated with acid or alkali; and finally, the PFC is prepared. The method of the invention completely realizes reclamation and recycling of wastes and water environment treatment and finally 'zero' emission and has good environmental protection, simple preparation process, high economic benefit and wide application scope.

Methods for separating carbon dioxide from a fluid stream at a temperature higher than about 200° C. with selectivity higher than Knudsen diffusion selectivity include contacting a porous membrane with the fluid stream to preferentially transport carbon dioxide. The porous membrane includes a porous support and a continuous porous separation layer disposed on a surface of the porous support and extending between the fluid stream and the porous support layer. The porous support comprises alumina, silica, zirconia, stabilized zirconia, stainless steel, titanium, nickel-based alloys, aluminum-based alloys, zirconium-based alloys or a combination thereof. Median pore size of the porous separation layer is less than about 10 nm, and the porous separation layer comprises titania, MgO, CaO, SrO, BaO, La₂O₃, CeO₂, HfO₂, Y₂O₃, VO_z, NbO_z, TaO_z, ATiO₃, AZrO₃, AAl₂O₄, A¹FeO₃, A¹MnO₃, A¹CoO₃, A¹NiO₃, A²HfO₃, A³ CeO₃, Li₂ZrO₃, Li₂SiO₃, Li₂TiO₃, Li₂HfO₃, A⁴N¹_yO_z, Y_xN¹_yO_z, La_xN¹_yO_z, HfN²_yO_z, or a combination thereof;

• • wherein

A is La, Mg, Ca, Sr or Ba;

A¹ is La, Ca, Sr or Ba;

A² is Ca, Sr or Ba;

A³ is Sr or Ba;

A⁴ is Mg, Ca, Sr, Ba, Ti or Zr;

N¹ is V, Nb, Ta, Cr, Mo, W, Mn, Si or Ge;

N² is V, Mo, W or Si;

x is 1 or 2;

y ranges from 1 to 3; and

z ranges from 2 to 7.

The invention relates to a desulfurization process containing acidic gas H2s, comprising the following steps: high temperature cross reaction is carried out in a combustion furnace; 3 cross reactions of varying levels are respectively carried out in a primary transformation reactor, a secondary transformation reactor and a tertiary transformation reactor; a ferric oxide desulfurization reaction is carried out in a fourthly oxidation sweetening reactor; wherein, process gas produced after the high temperature cross reaction and 3 cross reactions of varying levels passes through a primary cooler, a secondary cooler, a tertiary cooler and a fourthly condenser for hydrocooling; condensed liquid sulfur is collected; in the ferric oxide desulfurization reaction, ferric oxide is used as desulfurization catalyst for reaction, then the liquid sulfur enters the fourthly condenser, and the condensed liquid sulfur is collected; the process gas is discharged after removing sulfur fog drops. The invention can be used to carry out desulfurization treatment on acidic gas of oil refining devices, natural gas production devices or other industrial devices containing H2S acidic gas.

The invention belongs to the technical field of biomolecular labeling, in particular to a method for preparing an amino functional magnetic fluorescent coding microsphere with double-nucleocapsid structure. Two semiconductor quantum dots with different fluorescence colors and superparamagnetic ferric oxide nano-particles are embedded in a same silicon dioxide nano-particle in inverse microemulsion to form an amino functional magnetic fluorescent coding microsphere which has the granularity between 40nm and 100nm, high fluorescence intensity and high stability. The invention adjusts the fluorescence position and the intensity of the microsphere by changing the sort and the proportion of the quantum dots of different fluorescence colors and realizes different fluorescent coding. The addition of superparamagnetic ferroferric oxide ensures that the microsphere can gather and move fast in a targeted way under the action of an externally-applied magnetic field. Through amido modification on the surface of the microsphere, the invention can be widely applied to the fields of immunological test, nucleic acid hybridization, gene analysis, cell classification and imaging, etc.

The invention discloses a solid pattern casting special paint and a preparation method thereof. The mass percentages of various constituents in the paint are: 30-40% of bauxite chamotte, 20-30% of flaky graphite powder, 6.3-8.5% of bonder, 1-2% of iron oxide red powder, 4-6% of suspending agent, 0.8-1.5% of water reducing agent and 20-30% of water. The preparation method comprises the steps: mixing the various components of the solid pattern casting special paint according to the mass percentages and loading the constituents into a ball mill; adding 50-80 ceramic balls with a diameter of 30-50 mm into the ball mill; and mixing and stirring the materials evenly to obtain the paint. Practices show that the paint has strong abrasion performance, high adhesiveness, good air permeability and fast-dry performance both in low and high temperature environments; the paint can satisfy the production requirement of large casting production; the preparation method disclosed by the invention is simple; and the cost is low.

The present invention relates to high nitrogen doped corrugated carbon nanotube material and its synthesis process. The synthesis process includes the following steps: mixing Fe source and proper amount of distilled water, soaking porous molecular sieve to carry ferric oxide or ferrous oxide, stoving and roasting at 300-1000 deg.c for 0.5-24 hr to obtain catalyst; setting the catalyst inside a pipe furnace, leading organic amine into the furnace under the protection of Ar or N2 and reacting at 650-1000 deg.c for 0.2-4.0 hr to obtain high nitrogen doped corrugated carbon nanotube mixture containing the catalyst; soaking the mixture in proper amount of or excessive hydrofluoric acid, sulfuric acid, nitric acid or acid for 0.5-24 hr; and washing in distilled water, suction filtering and drying to obtain high nitrogen doped corrugated carbon nanotube material. The material has nitrogen content of 10-40 %, reinforced surface polarity, etc, and is suitable for industrial production.

The invention relates to a method for extracting aluminum oxide, monox and ferric oxide from gangue combustion ashes. Coal blending is carried out according to heating value conditions after the gangue is pretreated, gangue activation is achieved while calcination generation is carried out, and the produced electricity and steam are supplied for a system to use; the aluminum oxide is extracted from the ashes by an acid method, the monox is extracted by an alkaline method, and the ferric oxide is extracted by comprehensive utilization of by-products; and acid, alkaline, lime, an extractant andCO2 which are required by each craft link are recycled inside the system. The invention has the beneficial effects that gangue reclamation is implemented by using the method; the energy and the chemical components in the gangue are fully utilized; the discharge amounts of greenhouse gases and waste ashes are greatly reduced, and the economic benefit of the system is improved; and the method is a novel technology of gangue greening and high added-value utilization, and has obvious competitive advantage.

A MnZn ferrite core is prepared from Fe2O3 (52-55 mol%), ZnO (7-12 mol%), MnO (36-38 mol%), nano CaO (0.01-0.5 wt.%), and SiO2 (0.004-0.03 wt.%) through sintering at 1150-1300 deg.C for 0.5-5 hr. Its advantages are high high-frequency performance, higher saturated magnetic flux density and low magnetic loss.

The invention relates to a method for preparing magnetic oxide iron Fe21.333O32, which comprises the following steps: (a) mixing solid soluble ferrous salt and solid hydroxid according to a molar ratio of iron to hydroxyl being between 1:2 and 1:3; (b) completing reaction of a mixed material prepared in step (a) by kneading, and controlling the temperature of the material not to exceed 70 DEG C in the kneading process; (c) drying a reaction product obtained in step (b) in air; (d) washing and filtering a material obtained in step (c); (e) naturally drying or baking a solid obtained in step (d); and (f) roasting a product obtained in step (e) at a temperature of between 150 and 500 DEG C. The invention further discloses a magnetic oxide iron Fe21.333O32 desulfurizer prepared by the preparation method. Tests show that the desulfurizer has high sulfur capacity reaching 62.0 percent.

An ultraviolet and infrared radiation absorbing green glass comprises: in % by weight, as coloring components, 0.5 to 1.1%, excluding 0.5%, total iron oxide in terms of Fe2O3; 0 to 2.0% CeO2, 0 to 1.0% TiO2; 0.0005 to 0.01% NiO; and 0.0001 to 0.001% CoO; wherein, when the glass has a thickness of 4 mm, the glass has a visible light transmittance of 70% or more, a total solar energy transmittance of 60% or less, and an ultraviolet transmittance defined by ISO 9050 of 25% or less.

The invention relates to a preparation method for a coal combustion improver. After common coal is added with coal additives for combustion, the effect of energy saving and emission reduction is obvious and effective. The preparation method comprises the following steps that: 1. high-stability sodium chlorate and potassium chloride react with each other to produce potassium chlorate when water is added and the sodium chlorate and the potassium chloride are dissolved; 2. leavening agent sodium acetate is introduced to conduct base exchange with humate in coal, low ignition point humate is produced and the ignition performance of the coal is reduced; and 3. ferric oxide required by the formula is compound insoluble in water. Thereby, ferric chloride and calcium oxide are used to react with each other to produce ferric oxide when water is added and the ferric chloride and the calcium oxide are dissolved. Other products in the market do not at all have the preparation and application characteristics of the three compounds.

The invention discloses a loading type Pd base metal nanometer cluster catalyst, a preparing method and applications thereof. The catalyst comprises Pd metal nanometer particles of 1-25nm, or bimetal or polymetal nanometer particles containing Pd, and ferric oxide nanometer particles, wherein the ferric oxide nanometer particle is used as the carrier, has the primary particle size of 5-200nm, and has the general formula of FeyOx; the bimetal or polymetal nanometer particles are selected from one or a plurality of Pt, Rh, Ru, Os, Ir and Re; when the metal nanometer particles are Pd nanometer particles, x/y is greater than 1, but is smaller than 4/3, or is greater than 4/3, but is smaller than 3/2; and when the metal nanometer particles are bimetal or polymetal nanometer particles containing Pd, x/y is greater than 1, but is smaller than or equal to 3/2. The catalyst has excellent activity, selectivity and stability on the selective hydrogenating synthesis chlorinated arylamine of the chlorinated aromatic compounds, solves the problems of hydrogenolysis and dechlorination of products in the process of the Pd catalyst catalyzing the chlorinated aromatic compounds to hydrogenate to prepare the chlorinated arylamine, and has important industrial application values.

The invention discloses a high strength weathering resistant steel, an iron oxide layer is covered on the surface of the weathering resistant steel, Fe3O4 content in the iron oxide layer, the thickness is 7-10 mum, the weathering resistant steel comprises the following components by weight: 0.01-0.05% of C, less than or equal to 0.2% of Si, 1.5-2.0% of Mn, less than or equal to 0.02% of P, less than or equal to 0.008% of S, 0.2-0.4% of Cu, 0.2-0.4% of Ni, 0.4-0.7% of Cr, 0.15-0.50% of Mo, 0.02-0.04% of Nb, 0.015-0.025% of Ti, less than or equal to 0.03% of Als and the balance of Fe and inevitable impurities. The invention also provides a preparation method for the weathering resistant steel. The prepared weathering resistant steel has good mechanical property, weather resisting property and welding performance, and can be used under the condition that the coating is mitigated.

Processes for reducing the appearance of ashiness or pastiness on skin by applying thereto a cosmetic composition comprising transparent iron oxide particles, iron-containing titanium dioxide particles, and a cosmetically acceptable carrier. These processes are useful to provide coverage of skin imperfections and/or skin tonal variations and/or skin discoloration surrounding the eyes on different types of skin, while, at the same time, retaining a natural skin appearance.

The invention relates to the technology of the surface enhanced raman substrate, and particularly relates to a point-array surface enhanced raman substrate and a preparation method. The preparation method comprises the following steps: a. preparing iron oxide particles with uniform particle size; b. covering each iron oxide particle with a gold layer to obtain a gold-cladding magnetic nano particle; c. preparing a silicon chip substrate with point-array micro pits; d. washing the silicon chip substrate, and drying the silicon chip substrate; e. carrying out hydrophilic treatment on the silicon chip substrate; f. gathering the gold-cladding magnetic nano particles in the micro pits; and g. cleaning the gold-cladding magnetic nano particles overflowing from the micro pits on the silicon chip substrate to obtain the hard surface enhanced raman substrate. The point-array surface enhanced raman substrate is prepared in the method. By adopting the preparation method, the active substrate with high sensitivity, good repetition and high uniformity and stability can be prepared.

The invention discloses a method for preparing nanometer iron particle with a modified liquid phase reduction method. The main steps comprise: preparing soluble ferric salt solution and NaBH4 or KBH4 solution; adding polyethylene pyrrolidone into said soluble ferric salt solution according to a certain proportion, stirring evenly; adding NaBH4 or KBH4 solution into said soluble ferric salt solution under continuous stirring condition, stirring continuously until solution changes into black; selecting nanometer iron particle with magnetic method; washing with distilled water firstly, then washing with acetone or alcohol, storing in acetone or alcohol. The invention needs no nitrogen protective device, process is easy for operation, production cost is low; the distribution of got nanometer iron particle is homogenous (40-80nm), average particle size is 60 nm, specific surface area is 45-56m2/g, and there is no ferric oxide.

The invention discloses a sulfur-tolerant deoxidizing catalyst, preparation method and application thereof. The catalyst of the invention is composed of active components and porous carriers, the active components are one or more of compound of iron and/or copper, the porous carriers are selected from one or more of aluminium oxide, titanium oxide, zirconium oxide, zinc oxide, magnesium oxide, calcium oxide, silicon dioxide, aluminophosphate molecular sieves, A type molecular sieves, X type molecular sieves, Y type molecular sieves, mordenite, ZSM-5 zeolite, kieselguhr, kaoline, natural clay, aluminum silicate and magnesium silicate. Based on the oxide content, the active components loading amount is 1-95% by weight, the rest are porous carriers. The catalyst of the invention has definite sulfur-tolerant performance, is suitable for deoxidation treatment of coal seam gas with oxygen content of 3-6% (V/V), and can deoxidize the coal seam gas to make the oxygen content less than 0.5%.

The invention belongs to the field of catalysts and discloses a loaded binary composite metal oxide catalytic ozonation catalyst with gamma-Al2O3 microspheres as carriers and manganese oxide and ferric oxide as active components and a preparation method thereof. The preparation method of the loaded binary composite metal oxide catalytic ozonation catalyst comprises dipping gamma-Al2O3 microspheres in a mixed solution containing water-soluble manganese salt and water-soluble ferric salt, taking out the gamma-Al2O3 microspheres, carrying out drying and carrying out high temperature roasting to obtain the loaded binary composite metal oxide catalytic ozonation catalyst. The loaded binary composite metal oxide catalytic ozonation catalyst has significantly improved particle uniformity, good stability, good reusability and excellent catalytic activity. Compared with gamma-Al2O3 microsphere or manganese and iron single component-loaded catalysts, the loaded binary composite metal oxide catalytic ozonation catalyst significantly improves an organic removal rate by at most 38%, greatly reduces paper-making wastewater organic pollutant types and content and fully degrades difficultly biodegraded organics.

The invention relates to a catalyst used in preparation of low-carbon olefins by using synthesis gas and a preparation method and application of the catalyst. The catalyst comprises a main active ingredient and a co-active ingredient, wherein the main active ingredient is ferric oxide and zinc oxide, and the co-active ingredient is potassium hydroxide or magnesium carbonate. The method for preparing the catalyst is shown in the specification. The catalyst has the advantages that the low-carbon olefins are obtained directly by the synthesis gas without an intermediate product such as methanol, so that the low-carbon olefins are low in production cost and high in selectivity; and a separation flow is simple, the per-pass conversion rate of CO is high, the production capacity of methane and CO2 is low, and the operation energy consumption is low. The catalyst is used in synthesis of the low-carbon olefins directly by using the synthesis gas.