14 results about "Ferric oxyhydroxide" patented technology

A carbon dioxide (CO2) hydrogenation catalyst and a method of its preparation. The CO2 hydrogenation catalyst includes an alkali-metal enriched bauxite residue including calcium carbonate (CaCO3), iron(III) oxide (Fe2O3), iron(III) oxyhydroxide (FeO(OH)), aluminum hydroxide (Al(OH)3), sodalite, muscovite, and Na5Al2CSi3O15. The CO2 hydrogenation catalyst further includes 1 weight percent (wt. %) to 10 wt. % potassium based on a total weight of the CO2 hydrogenation catalyst by inductively coupled plasma optical emission spectroscopy (ICP-OES). The CO2 hydrogenation catalyst is used in a method of hydrogenating carbon dioxide to produce olefins.

A method for preparing and applying an iron hydroxyl oxide-metal-organic framework heterostructure alkaline water electrolysis catalyst is disclosed, belonging to the technical field of electrochemical energy storage materials. The preparation method involves: firstly, anolysing iron foam under constant current; then dissolving 2,5-dihydroxyterephthalic acid and nickel nitrate hexahydrate in a mixed solvent of N,N-dimethylformamide / ethanol / deionized water; transferring the mixture to a reaction vessel, tilting the iron foam into the vessel, sealing and heating the reaction, and then naturally cooling to room temperature; removing the iron foam, rinsing it with deionized water and ethanol (both sides), and finally vacuum drying. This method is simple and reproducible, requiring no cumbersome high-temperature pyrolysis or etching processes, and is suitable for large-scale preparation. In a standard three-electrode system, the prepared electrocatalyst is directly used as the working electrode in a 1 M KOH electrolyte for electrocatalytic reaction; the electrocatalyst exhibits excellent water splitting activity and cycling stability at high current densities.

A water treatment method for reducing the dissolved silica content thereof, the method being characterized in that it comprises at least one step of adsorbing the dissolved silica, the step consisting of passing the water through a reactor containing a granular adsorbent material consisting of iron(III) hydroxide and / or iron(III) oxyhydroxide grains, and at least one step of regenerating the adsorbent power of the granular material, the step consisting of bringing the granular material into contact with a base and at least one chloride.

The invention discloses a Fe / Ce bimetal-based organic framework and a preparation method and application thereof.The Fe / Ce bimetal-based organic framework is obtained through an acid-base neutralization reaction of a Ce-based metal organic framework material and alkaline ferric hydroxide, and the preparation method specifically comprises the following steps that 1, Ce (NO3) 2.6 H2O solution and a 1, 3, 5-benzene tricarboxylic acid solution are mixed and subjected to a stirring reaction, synthesis is conducted through a solvothermal synthesis method, and the Fe / Ce bimetal-based organic framework is obtained; washing the precipitate obtained by the reaction, and drying in vacuum to obtain the Ce-based metal organic framework material (Ce-MOFs); and (2) Ce-MOFs and Fe (OH) 3 are subjected to in-situ acid-base neutralization, Fe enters an uncoordinated carboxyl skeleton, and Fe / Ce bimetallic doping is achieved. The preparation method is simple and easy to operate, and the prepared bimetal-based organic framework has a cluster overlapping structure, is large in specific surface area, shows sensitive detection characteristics on aflatoxin, and can be used as an electrode modification material to quickly, sensitively and accurately detect low-concentration aflatoxin in a detection environment and a food sample.

The embodiment of the invention relates to a method, a device, equipment and a medium for controlling water inlet residual aluminum of a nanofiltration membrane of a water purification plant, and the method comprises the following steps: arranging a residual aluminum online instrument at a water inlet pipe of the nanofiltration membrane for monitoring the concentration value of residual aluminum entering the nanofiltration membrane, and arranging a coagulant aid static mixer on a water outlet pipeline of a sedimentation tank, a first dosing point is arranged on the coagulant aid static mixer, the first dosing point is communicated with the coagulant aid metering pump through a dosing pipeline, the coagulant aid metering pump is communicated with the ferric trichloride storage tank, the central control system determines the dosing amount of the ferric trichloride by obtaining the residual aluminum concentration value monitored by the residual aluminum online instrument, and on the basis of the dosing amount of the ferric trichloride, the coagulant aid static mixer is connected with the coagulant aid metering pump through a dosing pipeline. And the coagulant aid metering pump is controlled to start metering, and ferric trichloride coagulant aids are injected into the dosing pipeline to the coagulant aid static mixer, so that ferric hydroxide colloid generated by hydrolysis of the injected ferric trichloride coagulant aids is used for adsorbing and precipitating active aluminum ions in the effluent, and the purpose of further finely removing aluminum by using a small amount of coagulant aids is achieved.

A filter for a liquid purifier, comprising: a filter housing having an inlet to receive water and an outlet to discharge the water, and a filter module provided in the filter housing, and configured to purify water introduced through the inlet, and to provide the purified water to the outlet, wherein the filter module includes a carbon block having a hollow tube shape by mixing activated carbon, a binder, ferric hydroxide, and titanium oxide, and the binder is mixed at a ratio of 13% to 23% by weight.

This invention discloses a method for preparing lithium iron phosphate using iron hydroxyl oxide as an intermediate, belonging to the field of new energy battery materials. The method includes: removing impurities from a ferrous sulfate solution, adding ammonium bicarbonate and ammonium fluoride, heating and passing an oxidizing gas to react and generate the iron hydroxyl oxide intermediate; mixing and milling this intermediate with a phosphorus source, a lithium source, and a carbon source, spray drying, and sintering under an inert atmosphere to obtain lithium iron phosphate cathode material. This invention uses iron hydroxyl oxide as the sole iron source, eliminating the need for the iron phosphate intermediate throughout the entire process. In step two, ammonium fluoride is used for in-situ doping with fluorine, and combined with the structural template effect of the nanorod-shaped iron hydroxyl oxide, uniform nanoparticles are obtained with only one milling operation, forming microporous channels. This method simplifies the production process, reduces equipment investment and energy consumption, and the resulting material exhibits high capacity, high initial efficiency, and excellent rate performance.

The present application aims to provide a sucrose hydroxyl ferric oxide tablet composition and a preparation method thereof. The present application belongs to the technical field of pharmaceutical preparations, and particularly relates to a sucrose hydroxyl ferric oxide tablet composition and a preparation method thereof. The sucrose hydroxyl ferric oxide is a particle with a certain particle size distribution, and the pharmaceutical composition is prepared by adding pharmaceutically acceptable pharmaceutical adjuvants, the preparation method is simple, the product has small friability, is easy to package, and is more conducive to commercial production.

Provided is a powder of iron oxyhydroxide in which the nanoparticle content is controlled. A powder of iron oxyhydroxide in which the minor axis diameter Dn50 is from 100-300 nm and the proportion of particles having a minor axis diameter of less than 100 nm is 3.0% or less is provided through a method that includes: adding a metal-carbonate-free and metal-bicarbonate-free alkali to an iron(II)-containing aqueous solution to adjust the iron(II) concentration to 0.10-0.35 mol / L; blowing in an oxygen-containing gas to achieve a flow rate of 0.02-0.13 L / min per 1.00 mol of iron(II) while maintaining a solution temperature of 20-35°C; adding iron(II) to satisfy 7.0 ≤ (p + q) / p ≤ 12.0, where p is the substance amount / mol of iron(III) in the resulting nuclei, and q is the substance amount / mol of iron(II) added; adjusting the concentration of iron(II) to 0.45-0.85 mol / L; and blowing in an oxygen-containing gas at a flow rate of 0.01-0.10 L / min per 1.00 mol of iron(II) in a first stage and 0.03-0.12 L / min in a second stage while maintaining a solution temperature of 50-80°C.

This invention discloses a method and system for vanadium extraction wastewater treatment and ferric vanadate recovery, belonging to the field of vanadium-containing wastewater treatment. The method includes: circulating wastewater into multiple equalization tanks; simultaneously adding precipitated sludge from a thickener and polyferric sulfate, and stirring the reaction; after stopping the injection, continuing to add polyferric sulfate to adjust the pH to weakly acidic, stirring, and allowing it to settle to form ferric vanadate precipitate; sending the supernatant from the equalization tanks to the reaction tank, adjusting the pH, adding flocculant, reacting, and then separating in the thickener; returning the precipitated sludge to the equalization tank currently used for vanadium extraction wastewater injection, and the supernatant entering subsequent processes; the ferric vanadate precipitate at the bottom of the equalization tank being filtered to obtain ferric vanadate filter sludge; the system includes at least two equalization tanks, one reaction tank, and one thickener. This invention achieves the recovery and utilization of ferric hydroxide by returning the precipitated sludge from the thickener, reducing the amount of polyferric sulfate added, significantly reducing operating costs, and increasing the ferric vanadate content in the filter sludge.

The invention relates to the technical field of desulfurizing agents, in particular to a ferric oxyhydroxide desulfurizing agent and a preparation method thereof. The invention aims to solve the problems of low particle mechanical strength, high probability of pulverization to cause increase of bed pressure drop and insufficient sulfur capacity release caused by unreasonable pore structure of the existing desulfurizer in deep purification of low-concentration hydrogen sulfide. The preparation method comprises the following steps: by taking ferric nitrate as an iron source, generating iron oxyhydroxide slurry through urea hydrolysis reaction, and constructing a surface anchoring site through complexing modification of sodium citrate; introducing cetyltrimethylammonium bromide and sodium salicylate micelle templates to directionally construct mesopores; kneading and forming, spraying a salt solution, wetting, heating and aging to strengthen the compactness of the surface layer, and finally treating with hydrogen peroxide to remove the template. The obtained desulfurizer has the advantages of high mechanical strength, low wear rate, excellent mesoporous structure and long low-concentration penetration life, and is suitable for low-concentration long-period scenes such as urban gas purification.

The invention provides a preparation method of a nanometer iron oxide reinforced high-temperature-resistant aluminum-based composite material, and relates to the technical field of aluminum-based composites.The preparation method comprises the following steps that aluminum raw material powder and a nanometer iron hydroxide Fe (OH) 3 precursor serve as raw materials, and Al-Fe (OH) 3 composite powder is prepared; the Al-Fe (OH) 3 composite powder is subjected to heat treatment, Fe (OH) 3 is decomposed into Fe2O3 in situ, and Al-Fe2O3 composite powder is obtained; and the Al-Fe2O3 composite powder is sequentially subjected to pressing treatment, sintering treatment and deformation processing treatment, and the nano iron oxide reinforced high-temperature-resistant aluminum-based composite material is obtained. According to the invention, the surface of the aluminum powder is uniformly coated with nano Fe (OH) 3 through first ball milling treatment to form a core-shell structure with the Al powder as a core and the nano Fe (OH) 3 as a shell, so that the Fe (OH) 3 on the surface is decomposed into Fe2O3 in situ after heat treatment, and the nano Fe2O3 is uniformly distributed at a grain boundary after pressing and sintering treatment, so that the surface of the aluminum powder is uniformly coated with the nano Fe (OH) 3. And the problem of non-uniform reinforcement phase distribution caused by difficulty in refining and serious agglomeration of the traditional industrial-grade Fe2O3 is solved.

The application discloses an integrated metal electrode and a preparation method and an electrocatalytic synthesis ammonia method, relates to the technical field of electrocatalytic synthesis ammonia, and solves the problems of poor structural and interface stability of the existing electrode under fluctuating power conditions, easy attenuation of ammonia yield and faradic efficiency, and lack of electrode preparation and ammonia synthesis complete technology suitable for fluctuating working conditions. The electrode takes foamed iron, cobalt or nickel as a substrate, and has an active phase in situ grown on the surface; the active phase is ferric oxyhydroxide, cobalt oxyhydroxide or nickel hydroxide. The foamed metal is pretreated, and the foamed metal is subjected to CV circulation in an alkaline electrolyte at 1.4-0.6V in a three-electrode system to obtain the integrated metal electrode. The integrated metal electrode is used as a working electrode, an alkaline solution containing nitrite is used as an electrolyte, and the nitrite is reduced and electrocatalytically synthesized into ammonia under the condition of constant current with fluctuating current density in a three-electrode electrolysis system. The application can be used for electrocatalytic reduction and synthesis of ammonia from nitrite under fluctuating power conditions.

The utility model provides a ferric oxyhydroxide desulfurization tower and a desulfurization system, and relates to the technical field of desulfurization. The iron oxyhydroxide desulfurizing tower comprises a tower body; a desulfurization cavity is formed in the tower body; a gas outlet and a gas inlet are respectively formed in the top and the bottom of the desulfurization cavity; a drainage guide plate, a gas distributor and a desulfurization filler layer are sequentially arranged in the desulfurization cavity from bottom to top; the drainage guide plate is in a hollow frustum shape, and one end with large outer diameter of the drainage guide plate is close to the gas distributor and is hermetically connected with the inner wall of the desulfurization cavity; the gas distributor comprises a plurality of demisting plates which are mounted in the desulfurization cavity at intervals; and a gas circulation channel is formed in a gap between the adjacent demisting plates. Most moisture in the sulfur-containing gas can be removed by utilizing the drainage guide plate and the gas distributor, so that the probability that the moisture and hydrocarbon substances contained in the moisture are in contact with the desulfurization filler layer is reduced, and the situation that the moisture and the hydrocarbon substances react with the filler in the desulfurization filler layer, so that the filler performance is reduced is avoided; the desulfurization effect and the service life of the desulfurization filler layer are improved.