39results about "Ferrous oxides" patented technology

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 present invention relates to a method for the refining of a material comprising iron oxide and at least one contaminant selected from the group consisting of halogen and sulfur by reducing the content of the at least one contaminant, characterized by calcining the material in the presence of a gas containing water vapor. The invention also relates to a refined material obtainable from such a method and the use for catalyst production.

The invention discloses a device and a method for desulfurizing sulfide-containing wastewater and recovering sulfur, the device and the method utilize efficient reaction of iron oxyhydroxide and sulfide, excessive iron oxyhydroxide reacts to generate ferrous oxide and sulfur, and a small part of ferrous sulfide exists; the surfaces of ferrous sulfide and sulfur in a reaction product are provided with negative charges, and the surface of the residual unreacted iron oxyhydroxide is provided with positive charges, so that floc is formed through the electric neutralization flocculation action of several compounds and can be quickly precipitated; after precipitation, overlying water is treated desulfurized water, ferrous sulfide and ferrous oxide generated in the precipitate are aerated and oxidized in an iron regeneration device, iron oxyhydroxide can be regenerated, and residual sulfide in the ferrous sulfide is converted into elemental sulfur; and the generated iron oxyhydroxide can be used for treating the sulfide-containing water again, so that the sulfide-containing water is treated through reciprocating circulation, and the elemental sulfur and the iron oxyhydroxide are mixed together for continuous accumulation.

The present invention provides a method of producing hydrochloric acid, comprising reacting high-temperature gaseous chlorine and water vapour in a carbon-free reverse Deacon reaction (RDR) at a temperature of from about 450 to about 750 °Celsius to produce a mixture of gases comprising hydrogen chloride and oxygen. The chlorine is produced by fusing and electrolysing sodium or magnesium chloride in solid phase. The water vapour comes from thermally decomposing a hydroxide of at least one of calcium, magnesium and iron in the absence of oxygen to produce the water vapour without any admixture of oxygen (e.g., from atmospheric air). The mixture of gases produced by the RDR is immediately contacted with liquid water to dissolve the hydrogen chloride therein, thereby producing hydrochloric acid and a stream of tail gases. Heat is extracted from the hydrochloric acid to maintain its temperature substantially constant until the stream of tail gases is no longer in contact therewith. Thus the chlorine and water vapour are both supplied to the RDR at high purity and require little, if any, preheating. Heat extracted from contacting the mixture of gases with liquid water may be used to keep the RDR within its range of operating temperatures. Oxygen can be separated from the stream of tail gases, and the oxygen-depleted stream can be recycled back to the RDR to give a high percentage conversion of chlorine to hydrogen chloride. The RDR may be uncatalysed and kept within its operating temperature range by radio-frequency volumetric heating in at least one of the IEEE Ku-, K- and Ka-bands. The invention also provides a corresponding apparatus (1h) for producing hydrochloric acid, comprising an electrolytic cell (10) for the electrolysis, a gas-tight kiln (20) for the thermal decomposition, a gas-phase reactor (30) for the RDR, and an absorber (40) for dissolving the hydrogen chloride in the liquid water. The apparatus (1h) may further comprise a separator (80) for separating the stream of tail gases into the oxygen-depleted stream and a stream of oxygen, which may be fed to a steelmaking apparatus (90), for example. The liquid water for dissolving the hydrogen chloride can come from condensing water vapour obtained by drying an aqueous solution of sodium or magnesium chloride or of sodium hydroxide. The apparatus (1h) may therefore also comprise a dryer (60) for drying this aqueous solution, and a condenser (70) for condensing the water vapour thus obtained. Sodium chloride or magnesium chloride in solid phase derived from drying the aqueous solution may be recycled back to the electrolytic cell (10). Electricity for the electrolysis can come from a renewable resource. At least some of the heat for the thermal decomposition may come from the liquid metal which is a co-product of the electrolysis. The invention is therefore highly energy efficient and requires little, if any, extra energy, apart from the electricity required for the electrolysis. The invention also uses commonly available ingredients and produces no greenhouse gases.

A method for extracting an iron oxide composition from a mafic and / or ultramafic rock comprises introducing a mafic and / or ultramafic rock and CO2 to a first reactor, reacting the mafic and / or ultramafic rock and CO2 in the first reactor, thereby yielding a first reactor effluent comprising one or more iron silicate compounds and one or more products of the reaction in the first reactor; separating the first reactor effluent into a first stream comprising the one or more iron silicate compounds and a second stream comprising the one or more reaction products of the first reactor; introducing the first stream and water to a second reactor; and reacting the first stream and water in the second reactor, thereby yielding a second reactor effluent comprising one or more iron oxide compounds, water, and silica.

The application belongs to the technical field of material application, and particularly relates to a graphitized carbon material and a preparation method and application thereof, the preparation method of the graphitized carbon material is as follows: (1) D-(+)-xylose powder and transition metal salt powder are weighed and uniformly ground; (2) after sieving, calcination is carried out under an inert gas atmosphere; (3) after grinding and sieving of the calcined product, washing is carried out with 1.0 mol / L dilute hydrochloric acid solution, then washing is carried out with distilled water and drying is carried out, to obtain the graphitized carbon material, the graphitized carbon material has high adsorption efficiency on aflatoxin B1 (AFB1) in vegetable oil, and in combination with magnetic solid phase extraction (MSPE) and high performance liquid chromatography-fluorescence detection (HPLC-FLD) technology, the detection limit is as low as 2.0 pg·g ‑1 The graphitized carbon material has excellent regeneration performance, and the material consumption and cost in the detection process are significantly reduced.

The present application relates to a method for mineral separation using biological reagents extracted from gram-positive bacteria. Specifically, the invention relates to a mineral beneficiation method adopting gram-positive bacteria rhodococcus turbid and rhodococcus erythropolis extracts as biological reaction reagents. In this regard, the floatability of minerals is embodied by using gram-positive bacteria as a biological reaction reagent, so that the future prospects of the gram-positive bacteria as substitutes for synthetic reaction reagents and substitutes for separately using microorganisms (biomass) are shown.

The present invention provides a method for preparing an M-MOF nanomaterial with electrocatalytic activity, comprising: step S1: weighing a certain mass of NaOH or KOH and dissolving it in distilled water, stirring it fully and heating it to 95°C, adding a certain mass of FeCl3 aqueous solution and fulvic acid aqueous solution, then aging it at 95°C for a certain period of time, cooling it to room temperature, centrifuging it several times with distilled water and anhydrous ethanol, and then drying it in an oven to obtain a precursor; step S2: first fully grinding the precursor to obtain a uniform powder, and then roasting it in a N2 atmosphere in a tubular furnace; step S3: after the roasted precursor is cooled to room temperature, centrifuging it several times with distilled water and anhydrous ethanol, and finally drying it in an oven to obtain a black powdery solid product, which is marked as M-MOFs. The structure of the present invention is unique, so that its charge transfer ability is suitable for the electrocatalytic hydrogen production process, meets the needs of industrial development, and solves the problem of shortage of hydrogen energy.

A method for producing crystalline α-Fe2O3 nanoparticles involving ultrasonic treatment of a solution of an iron (III)-containing precursor and an extract from the seeds of a plant in the family Linaceae. The method involves preparing an aqueous extract from the seeds of a plant in the family Linacae and dropwise addition of the extract to the solution of an iron (III)-containing precursor. The method yields crystalline nanoparticles of α-Fe2O3 having a spherical morphology with a diameter of 100 nm to 300 nm, a mean surface area of 240 to 250 m2 / g, and a type-II nitrogen adsorption-desorption BET isotherm with a H3 hysteresis loop. A method for the photocatalytic decomposition of organic pollutants using 10 the nanoparticles is disclosed. An antibacterial composition containing the crystalline α-Fe2O3 nanoparticles is also disclosed.

The invention provides a lithium iron phosphate precursor material and a preparation method thereof, a lithium iron phosphate material and a preparation method thereof, a positive pole piece and a secondary battery, and belongs to the technical field of secondary batteries, the lithium iron phosphate precursor material comprises Fe (1 + X) O (1 + 3 / 2X), lithium dihydrogen phosphate and a first carbon source; the mole number ratio of ferrous element in Fe (1 + X) O (1 + 3 / 2X) to lithium dihydrogen phosphate is 1: (1.03-1.2); x is less than or equal to 0.04; the content of carbon element contained in the first carbon source in the lithium iron phosphate precursor material is 6-10% by weight; the specific surface area of the lithium iron phosphate precursor material is 8 m < 2 > / g to 10 m < 2 > / g, and the compaction density under the pressure of 3T is 1.6 g / mL to 2.5 g / mL. The lithium iron phosphate material with high capacity and high compaction density can be obtained, so that the energy density of the lithium iron phosphate material is improved.

The invention belongs to the technical field of material application, and particularly relates to a graphitized carbon material and a preparation method and application thereof.The preparation method of the graphitized carbon material comprises the steps that 1, D-(+)-xylose powder and transition metal salt powder are weighed and fully ground to be uniform; (2) after sieving, calcining in an inert gas atmosphere; and (3) grinding and sieving the calcined product, washing with 1.0 mol / L diluted hydrochloric acid solution, washing with distilled water, and drying to obtain the graphitized carbon material, efficiently adsorbing the aflatoxin B1 (AFB1) in the vegetable oil, combining magnetic solid phase extraction (MSPE) and high performance liquid chromatography-fluorescence detection (HPLC-FLD) technologies, reducing the detection limit to 2.0 pg.g <-1 >, and ensuring that the graphitized carbon material has excellent regeneration performance. And the material consumption and the cost in the detection process are obviously reduced.

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include supplying an iron and / or aluminum feed material and an acid to a first reaction chamber; supplying a first leachate comprising iron and / or aluminum salts or cations from the first reaction chamber and a calcium feed material to a second reaction chamber to form a solid comprising iron and / or aluminum; supplying a second leachate from the second reaction chamber comprising alkaline earth metal salts or cations and a base to a third reaction chamber to form a precipitated alkaline earth metal product.

The invention relates to processes for the removal of iron impurities and optionally other impurities from rare earth metal-containing compositions such as rare earth metal-containing compositions from magnets and ores.

The present invention relates to a method for refining a material comprising iron oxide and at least one contaminant selected from the group consisting of halogens and sulfur, by reducing the content of said at least one contaminant, characterized in that said material is calcined in the presence of a gas containing water vapor. The present invention also relates to a refined material obtainable from such a method and its use for the manufacture of catalysts.

The invention discloses a method for preparing a hard carbon negative electrode material from bagasse. The method comprises the following steps: Fe ion introduction, FeO introduction, starch wrapping and carbonization. FeO is introduced, so that the conductivity of the negative electrode material can be improved, the specific capacity of a product is improved, the energy density of a battery is improved, the particle size of bagasse powder and the particle size of leaf powder are 5-8 times that of the bagasse powder, small-particle-size leaf powder is more favorable for being adsorbed on large-particle-size bagasse powder, and soluble starch is used for wrapping, so that the conductivity of the battery is improved. Cellulose in the material can construct a conductive carbon net, conductivity is improved, volume expansion can be achieved all the time, meanwhile, a hard carbon layer is formed after outer-layer starch is carbonized, the specific surface area of the negative electrode material is reduced, the forming volume of an SEI film is effectively reduced, and improvement of the first-time efficiency is facilitated.

The purpose of the present disclosure is to provide an iron powder for odor elimination and deodorization, the iron powder having an excellent odor elimination and deodorization effect against various substances. An iron powder for odor elimination and deodorization according to one aspect of the present disclosure contains iron as a main component and contains 0.5% by mass or more of oxygen.

The invention discloses an efficient demanganizing agent, a preparation method of the efficient demanganizing agent and a molten steel demanganizing method after converter tapping. The efficient demanganizing agent comprises the following raw material components: CaF2 and FeO / Al2O3 composite particles, wherein the FeO / Al2O3 composite particles comprise a FeO inner core and a nano Al2O3 coating, and the surface of the FeO inner core is coated with the nano Al2O3 coating. According to the method, the efficient demanganizing agent is added after converter tapping, the purpose of deep demanganizing is achieved by increasing the oxidability of the top slag of the molten steel, the low-manganese steel production process is simplified, the purpose of deep demanganizing of the low-manganese steel can be achieved without purchasing low-manganese iron ore, adopting converter duplex or double-slag smelting and demanganizing in modes such as over-blowing, and the method is safe, reliable and low in cost. The production cost of the low-manganese steel can be reduced, and meanwhile furnace lining erosion can be effectively avoided.

The present disclosure provides a method for separating iron element in brine and application thereof. The method for separating iron element in brine comprises: adding a pH adjusting agent to brine, to adjust pH of the brine to 6.0-7.0, and controlling the temperature of the brine to 75° C.-90° C.; introducing an oxygen-containing gas into the brine, to covert the iron element in the brine into magnetic iron oxide; and separating the magnetic iron oxide from the brine by magnetic adsorption to obtain an iron-removed brine.

Methods and compositions are provided for deriving supplemental cementitious materials, such as cement and / or pozzolans, from one or more non-limestone materials, such as one or more non-limestone rocks and / or minerals, which are processed in a manner that produces a desired product, such as cement and / or supplemental cementitious material.

The invention relates to a hexagonal sheet-shaped Fe3O4 (at) FeO (at) C (at) ZnIn2S4 core-shell structure wave-absorbing material as well as preparation and application thereof, the hexagonal sheet Fe2O3 with the diameter of about 12 microns is taken as a template, and a double-layer core-shell structure with a magnetic core-PDA-derived carbon middle layer-semiconductor shell is constructed through surface coating polydopamine carbonization and in-situ growth of ZnIn2S4 nanosheets. Impedance matching is effectively improved through the hexagonal sheet structure, multiple loss mechanisms such as magnetic loss, interface polarization and dipole polarization are introduced into multiple heavy components, and the electromagnetic wave absorption performance of the material is cooperatively improved. The preparation method is simple, and the product is regular in morphology and excellent in performance and has wide application prospects in the technical fields of electromagnetic protection and stealth.

The present invention addresses the problem of providing a method for producing a highly active oxygen carrier at low cost, and a hydrogen production method and hydrogen production device using a highly active oxygen carrier. A method for producing an oxygen carrier according to the present invention, which is a method for producing an oxygen carrier containing an activated iron titanate containing an alkali metal titanate and iron oxide by firing a mixture of iron titanate particles and a basic component, the mixture of the iron titanate particles and the alkaline component is prepared by either physically mixing the iron titanate particles with an alkaline compound; and spraying or impregnating the iron titanate particles with an aqueous solution of an alkaline compound, and then drying the particles.

The object of the present invention is to provide a coloring ultraviolet protective agent in which the average molar absorption coefficient in the wavelength range from 200 nm to 380 nm is increased, and the color characteristics in the visible region are controlled. The present invention provides a coloring ultraviolet protective agent, which is useful for shielding ultraviolet rays and coloring, wherein the coloring ultraviolet protective agent comprises M2 doped oxide particles in which oxide particles (M1Ox) comprising at least M1 being a metal element or metalloid element, are doped with at least one M2 selected from metal elements or metalloid elements other than M1, wherein x is an arbitrary positive number, wherein an average molar absorption coefficient in the wavelength range of 200 nm to 380 nm of a dispersion in which the M2 doped oxide particles are dispersed in a dispersion medium, is improved as compared with one of a dispersion in which the oxide particles (M1Ox) are dispersed in a dispersion medium, and wherein a hue or chroma of color characteristics in the visible region of the M2 doped oxide particles is controlled.

A method for removing at least one impurity from metal-based nanoparticles, including at least two heating steps. During step 1, the temperature of the nanoparticles is increased to a temperature T1, and is then maintained at T1 during a heating time that is included between 1 second and 20 years, where T1 is included between 50° C. and 300° C. During step 2, the temperature of the nanoparticles is increased to a temperature T2, and is then maintained at T2 during a heating time that is included between 1 second and 20 years, where T2 is included between 300° C. and 600° C.

The invention discloses magnetic shrimp shell biochar as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) pretreating shrimp shells; 2) preparing shrimp shell biochar; and 3) preparing the magnetic shrimp shell biochar. According to the invention, the shrimp shell is used as a carbon source, a high-temperature pyrolysis method is adopted for magnetizing and modifying to prepare the shrimp shell biochar magnetic material, the green and recyclable biochar magnetic material is developed, waste is turned into wealth, and the application range of the biochar material in pretreatment analysis of typical hydrophilic organic matters of aquatic products is expanded; according to the application, the pretreatment process of UPLC-MS / MS detection of tetracycline drugs is effectively simplified, the experimental analysis efficiency is improved, a novel green and efficient method can be provided for detection of TCs in aquatic products, technical support is provided for effective monitoring of tetracycline drugs in aquatic products, and application of shrimp shell biochar materials in the fields of food safety and analytical chemistry is promoted.

Provided is a method for producing a highly active oxygen carrier at low cost, and a method for producing hydrogen and an apparatus for producing hydrogen using the highly active oxygen carrier. Solution A method for producing an oxygen carrier of the present invention is a method for producing an oxygen carrier formed of an activated iron titanate containing an alkali titanate and an iron oxide by calcining a mixture of iron titanate particles and an alkali component. The mixture of the iron titanate particles and the alkali component is prepared by any of: physically mixing the iron titanate particles and an alkaline compound; and spraying an aqueous solution of the alkaline compound to the iron titanate particles or impregnating the iron titanate particles with the aqueous solution of the alkaline compound and then drying the sprayed or impregnated iron titanate particles.

A method for producing crystalline α-Fe2O3 nanoparticles involving ultrasonic treatment of a solution of an iron (III)-containing precursor and an extract from the seeds of a plant in the family Linaceae. The method involves preparing an aqueous extract from the seeds of a plant in the family Linacae and dropwise addition of the extract to the solution of an iron (III)-containing precursor. The method yields crystalline nanoparticles of α-Fe2O3 having a spherical morphology with a diameter of 100 nm to 300 nm, a mean surface area of 240 to 250 m2 / g, and a type-II nitrogen adsorption-desorption BET isotherm with a H3 hysteresis loop. A method for the photocatalytic decomposition of organic pollutants using the nanoparticles is disclosed. An antibacterial composition containing the crystalline α-Fe2O3 nanoparticles is also disclosed.

Processes are provided in which successive steps of hydrometallurgical value extraction may be carried out using the products of carbon capture and an electrolytic reagent-generating process. The electrolytic process provides an acid leachant and an alkali hydroxide, with the alkali hydroxide then available for use either directly as a precipitant in the hydrometallurgical steps, or available for conversion by carbon capture to an alkali metal carbonate that can in turn be used as the precipitant in the selective hydrometallurgical steps.

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of FeO under laboratory conditions. The technical scheme of the invention is as follows: the method comprises the following steps: 1) grinding a certain mass of FeC2O4. 2H2O reagent until the particle size is below 150 meshes, and paving the ground FeC2O4. 2H2O reagent at the bottom of a crucible to obtain a material layer with the thickness of not more than 30mm; 2) determining components of the protective gas; according to the mass of the FeC2O4. 2H2O reagent, the flow of the introduced protective gas is calculated; (3) roasting the crucible, introducing protective gas, raising the temperature to 810 DEG C from room temperature at the temperature raising speed of 10 DEG C / min, and keeping the temperature for 30 minutes; then naturally cooling to room temperature; the obtained roasting product is FeO. According to the method, FeO with relatively high purity can be conveniently prepared under laboratory conditions, FeO raw materials are provided for a FeO-containing slag system, the accuracy of research on the FeO-containing slag system is favorably improved, and the development of a metallurgical technology is promoted.

This invention discloses a coated Prussian blue analog material and a sodium-ion battery. The material consists of a Prussian blue analog matrix and a coating layer, wherein the chemical formula of the Prussian blue analog PBA is A. x M A [M B (CN)6] 1‑y ·□ y The coating consists of nH₂O (0≤x≤2, 0≤y<1, n≥0), with the coating being a transition metal oxide (MO) and / or a boride (MB). This invention coats Prussian blue analogues, effectively improving their structural stability as a cathode material during cycling without affecting electrochemical performance. When used in sodium-ion batteries, it enhances cycle stability and cycle life while maintaining specific capacity and rate performance. Furthermore, the preparation method provided by this invention can form a uniform coating layer on the surface of Prussian blue analogues, using readily available raw materials, and is simple to operate, making it suitable for industrial production.