23results about "Iron oxides/hydroxides" patented technology

The application provides a lithium battery and a regeneration method of a positive electrode material thereof, a positive electrode sheet and a recycling system, and relates to the technical field of lithium batteries. The regeneration method comprises the following steps: obtaining recycled elements from a failed lithium iron phosphate positive electrode sheet, and preparing the recycled elements into recycled additives; obtaining ternary positive electrode active material powder from a failed ternary positive electrode sheet; mixing the recycled additives and the ternary positive electrode active material powder, and performing solid-phase sintering to obtain a closed-loop recycled positive electrode active material. The components in the waste lithium iron phosphate can be used as key additives for repairing and improving the performance of waste ternary materials, so that the high-value utilization of lithium iron phosphate is realized, and the ternary material is given deeper structural regeneration and performance upgrading. This not only solves the economic driving problem of lithium iron phosphate recycling, but also produces high-value-added ternary regenerated materials with superior performance, and finally builds a low-energy-consumption, low-emission and high-benefit collaborative recycling and closed-loop regeneration technology path.

A method for recycling catalytic metals comprising: collecting a plurality of spent catalytic metals, wherein the spent catalytic metals contain cathodes of NMC111, NMC622, NMC811, NCA, LCoO2, LiNi0.5Mn1.5O4, LiMnO4, LiNiO2, LiMn2O4, and / or LiMnO2 compositions; subjecting the plurality of spent catalytic metals to a green mixture, wherein the green mixture includes dihydrogen phosphite and water, phosphoric acid and water, sulfuric acid and water, hydrogen chloride and water, or nitric acid and water, at temperatures of between 80 and 120° C. to form a metal leachate solution; and recovering lithium (Li) from the metal leachate solution.

A method may comprise producing liquid sodium and chlorine gas by electrolysis. The liquid sodium may be redox reacted with iron and / or manganese oxide in an ore to produce iron and / or manganese and s

This invention discloses a functionalized MXene hollow sphere / MXene-PI composite aerogel and its preparation method. The composite aerogel uses MXene / PI aerogel with a vertically oriented millimeter-scale pore structure as the base layer and magnetic Fe-OH functionalized MXene hollow spheres as the self-supporting functional layer. The base layer and the self-supporting functional layer form a composite aerogel with a gradient structure. This invention obtains MXene hollow spheres using a template method, anchors Fe-OH magnetic particles to the surface of the hollow spheres using in-situ loading, and fabricates a three-dimensional porous aerogel framework base layer of MXene-PI using directional freeze-thermal imidization. Then, the functional layer and the base layer are co-frozen and assembled, followed by thermal imidization to obtain the composite aerogel. This invention achieves integrated electromagnetic wave absorption and thermal management performance by synergistically integrating magnetically functionalized MXene hollow spheres and a conductive PI network, forming a gradient structure.

The application belongs to the field of functional material preparation and catalysis technology, and discloses a preparation method of an iron oxide catalyst, which comprises the following steps: dissolving an iron precursor and a promoter in water respectively to form uniform aqueous solutions; mixing the two aqueous solution systems and stirring to make them uniformly mixed; continuously heating and stirring the mixed aqueous solution to evaporate water; drying the gel-like substance, and then calcining at a specified temperature for 5h to obtain the iron oxide catalyst. The method of the application obtains the iron oxide catalyst with high catalytic performance by calcining the mixture of the promoter and the iron precursor, and uses the iron oxide catalyst to catalyze the methylation reaction of phenol and methanol. The application improves the conversion rate and selectivity of the reaction by improving mass transfer, increasing the specific surface area and the content of acid sites, and has the advantages of simple operation, good repeatability, low cost, phenol conversion rate of 94.4%, product 2,6-dimethylphenol selectivity of 50.1%, and o-cresol selectivity of 49.2%.

Carbon and hydrogen are efficiently generated from carbon dioxide and water, and a reducing agent is repeatedly generated and used. The process includes: a carbon dioxide decomposition step of generating magnetite having carbon attached to a surface; a carbon separation step of generating carbon and iron chloride; a hydrogen production step of generating magnetite, hydrogen, and hydrogen chloride gas; and a reducing agent regeneration step of generating the reducing agent used in the carbon dioxide decomposition step, the reducing agent being an Fe3O4-based material obtained by reducing magnetite while maintaining a crystal structure of the magnetite. 4‑δ (where δ is 1 or more and less than 4) or an oxygen completely-deficient iron (δ = 4) obtained by completely reducing magnetite, an oxygen-deficient iron oxide obtained by reducing hematite or a used hot pack, or an oxygen completely-deficient iron obtained by completely reducing hematite or a used hot pack.

The application discloses a FeO(OH) solid, super-pure iron powder and a preparation method, and belongs to the field of powder metallurgy. The preparation method of the FeO(OH) solid is as follows: pure iron salt solution is obtained by acidolysis of iron concentrate raw materials with a total iron content of not less than 69wt%; then, an amide substance is added into the pure iron salt solution; and then, carbonates are slowly added to make the pH value of the solution increase at a speed of 0.1-0.3 / h to 4.0-6.0 for a precipitation reaction, and the FeO(OH) solid is obtained, wherein the carbonates include at least one of ammonium carbonate and ammonium bicarbonate. The super-pure iron powder is prepared by reducing the FeO(OH) solid to obtain iron powder and then purifying the iron powder through magnetic separation. The FeO(OH) solid prepared by the application has high purity, uniform particle size distribution and good dispersibility, and the super-pure iron powder prepared by the application has the characteristics of extremely low impurity content, good chemical stability and high magnetic permeability.

A method for forced conversion of valuable components in white gangue through wet grinding and pulping is disclosed. The method involves intelligent gangue selection, crushing the gangue, and then forcibly reacting it with a multi-component complex acid (hydrochloric acid, sulfuric acid, and nitric acid) in a rotary ball mill under crushing and penetrating conditions. The aqua regia effect of the multi-component acid easily breaks the chemical bonds of silicates in the gangue under gravity crushing, allowing the aluminum and iron metal components in the material to be dissolved by acid. The reaction product, aluminum ferrite, is washed and dissolved in water and subjected to an ammonia displacement reaction to obtain a mixture of aluminum hydroxide and iron hydroxide. The mixture is then subjected to alkali dissolution to extract aluminum hydroxide, achieving precise separation of aluminum and iron components and purification of alumina. Sodium silicate is produced by alkaline conversion of silica. Sodium silicate is then used to absorb carbon dioxide to displace silicic acid, which is then dried by high-pressure atomization to form molecular sieve hollow granules. In this invention, aluminum is extracted by acid extraction and silicon by alkali extraction, enabling resource utilization of solid waste while optimizing the process and maximizing the value of the products.

The application relates to the technical field of water pollution treatment, in particular to a preparation method and application of porous structure CuFe2O4. The preparation method of the porous structure CuFe2O4 comprises the following steps: stirring and mixing copper salt, iron salt and a pore-forming agent, grinding into a gelatinous product, calcining the gelatinous product for 1.5-3 hours, naturally cooling to below 100 DEG C and taking out, and finally fully grinding and sieving to obtain the porous structure CuFe2O4; wherein the molar ratio of the copper salt to the iron salt is 1:2-2.1; and the molar ratio of the copper salt to the pore-forming agent is 1:1.5-1.55. The preparation method of the porous structure CuFe2O4 and the application of the porous structure CuFe2O4 in activated sulfite degradation of organic pollutants have the advantages of high efficiency, environmental protection, economy and the like, and have important significance for the field of water treatment.

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on an eroded surface of a waste sagger discarded. Therefore, when the method for producing high-purity lithium sulfate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium sulfate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained as by-products during the production process of the lithium sulfate.

An embodiment provides a method for making a non-hazardous iron product for treating wastewater, including: adding sodium bisulfite to a solution comprising iron, creating an aqueous solution; adding an amount of sodium hydroxide to the aqueous solution to increase the pH of the aqueous solution to between 2-2.5; determining an amount of sodium bicarbonate and adding the identified amount of sodium bicarbonate to the aqueous solution, wherein the sodium bicarbonate adjusts the pH of the aqueous solution to a desired pH; and providing a buffer to the aqueous solution to generate a slurry. Other embodiments are described and claimed.

The present invention provides a method and apparatus for producing iron from an iron ore, together with an option for the onward conversion of that iron into steel. The iron may come from an iron ore in which the iron is present as at least one of the mineral and mineraloid forms of iron oxide and iron oxyhydroxide, such as hematite and limonite, as well as from red bauxite. The invention may also be used to produce elemental iron from other sources of iron oxide, such as from mill scale, whereby sources of waste iron oxide may be recycled. The method comprises comminuting the iron ore into fines, dehydrating the iron ore and dehydroxylating hydroxylated compounds in the ore. The ore thus treated is then reacted with an amount of liquid sodium in excess of the stoichiometric amount thereof required for a redox reaction between the liquid sodium and iron oxide(s) from the ore. This precipitates out from the liquid sodium both elemental iron and other insoluble products at least comprising sodium oxide. The redox reaction is conducted in an inert atmosphere and its temperature is controlled to remain below about 450 °Celsius to inhibit the production of ternary oxides like Na4FeO3. The method then comprises separating the iron from the other insoluble products, for example using magnetic and / or density-based separation, and separating the iron and the other insoluble products as a solid phase from the liquid sodium, in any order. Thus iron can be extracted from iron ore without producing any greenhouse gas emissions, and sodium oxide, which has a high affinity for carbon dioxide, is produced as a co-product. Since the iron is produced as a finely divided particulate, it may subsequently be converted into steel using a powder metallurgical technique with a considerable energy saving over prior art steelmaking techniques. If the sodium oxide is used to mineralize captured carbon dioxide, the invention can have a negative carbon footprint overall. If the iron ore comprises red bauxite, the other insoluble products may also be processed to extract alumina from them without creating environmentally hazardous red mud. In some embodiments, the other insoluble products may be used to produce an alkaline activator for an alkaline activated or geopolymer cement. The corresponding apparatus (3a) comprises a comminution device (2) (such as a rock crusher or grinder), a dryer (4) for dehydrating and dehydroxylating the iron ore, a gas-tight reaction vessel (130) for reacting the treated ore with the liquid sodium, a solid-species separator (180a) for separating the iron from the other insoluble products and a solid-liquid sodium phase separator (190a, 190b).

The present invention relates to a combustion additive comprising iron oxide nanoparticles; a fuel based on natural plant and animal fats and oils; and a method for producing the same. The production method allows up to 100% of the raw material, both virgin and waste fats and oils, to be used. The combustion additive and the fuel are useful in the combustion process; for example, in diesel-type alternative combustion engines.

The application belongs to the technical field of electrocatalytic materials, and particularly relates to a high-activity anti-corrosion and anti-fouling nano-array material based on interface water regulation and a preparation method and application thereof. The transition metal current collector is soaked in a solution containing a noble metal salt and a multi-functional organic molecule modifier, and is fully reacted to obtain the surface-modified transition metal hydroxide loaded noble metal nano-array material. For catalytic activity, the material can promote the hydrolysis of active hydrogen, and greatly improves the efficiency of seawater electrolysis hydrogen evolution. For material stability, in the complex environment of seawater, the material can not only effectively block the corrosion of corrosive ions in seawater to the substrate, prolonging the service life of the material, but also can inhibit the deposition of hydroxide scale layer on the electrode surface, effectively solving the performance degradation problem caused by fouling in seawater electrolysis hydrogen evolution. Thanks to the above excellent performance, the material of the application has great application potential in the field of seawater hydrogen production.

The application belongs to the technical field of energy storage and conversion materials and its preparation, and particularly relates to a FeOOH nanorod / reduced graphene oxide aerogel material, a preparation method and application thereof. The application dissolves iron acetate tetrahydrate, urea, ascorbic acid and graphene oxide prepared by a Hummers' method in water to form a uniform mixed solution; then the mixed solution is loaded into a glass sample bottle, the bottle cap is screwed tightly, and the bottle is placed in an oven to react at a certain temperature to obtain a FeOOH / RGO composite hydrogel; and then the FeOOH / RGO composite hydrogel is freeze-dried to obtain a dried FeOOH / RGO aerogel. The prepared aerogel has a porous structure, the average length of the FeOOH nanorod is less than 10 nm, and the FeOOH nanorod is uniformly loaded on the surface of the graphene. The prepared aerogel has good capacitive performance and good application prospect in supercapacitors.

The application provides a method for preparing lithium phosphate and recovering iron from phosphorus-iron slag, which comprises the following steps: (1) mixing phosphorus-iron slag and a salt additive, and sequentially performing grinding mixing and compression molding to obtain a first material; the first material is sequentially subjected to roasting and crushing to obtain roasted particles; (2) the roasted particles are subjected to leaching treatment and solid-liquid separation to obtain a phosphorus-containing leaching solution and a leaching residue; (3) sulfuric acid and the phosphorus-containing leaching solution are mixed to remove impurities, and a lithium source and the phosphorus-containing purified solution are mixed to prepare lithium phosphate through a first reaction; and (4) the leaching residue is subjected to washing treatment to obtain an iron-containing material; steps (3) and (4) are not arranged in a specific sequence. The method can realize efficient and selective phosphorus extraction, and obtain high-purity lithium phosphate and simultaneously recover iron, thereby achieving full utilization of resources and having a wide application prospect.

This invention relates to the field of wastewater treatment technology, specifically to a resource-based treatment method and system for carbon acid washing wastewater from silicon-carbon anode skeletons. The resource-based treatment method includes: passing the carbon acid washing wastewater from silicon-carbon anode skeletons into a nanofiltration system to obtain permeate and retentate; subjecting the permeate to a first-stage vacuum evaporation to obtain a dilute hydrochloric acid solution, potassium salt, and a primary crystallization residue; mixing the primary crystallization residue and the retentate, and adding alkali to obtain iron sludge and filtrate; subjecting the filtrate to a second-stage vacuum evaporation to obtain water, salt, and a secondary crystallization residue, which is returned to the filtrate, thereby achieving the resource-based treatment of the carbon acid washing wastewater from silicon-carbon anode skeletons. This invention also provides a treatment system for carbon acid washing wastewater from silicon-carbon anode skeletons. This invention solves the problem that existing acid washing wastewater treatment methods are difficult to achieve efficient removal of iron ions, and also solves the problem that existing acid washing wastewater treatment methods are difficult to simultaneously recover high-purity potassium salt and hydrochloric acid.

An electromagnetic wave absorption composition and an electromagnetic wave absorber are disclosed. The disclosed electromagnetic wave absorbing composition may be composed of: a main component containing iron oxide (FexOy, x=1, 2, 3, and y=1, 3, 4) in a content of 38 mol% to 52 mol%, manganese oxide (MnxOy, x=1, 2, 3, and y=1, 3, 4, 7) in a content of 18 mol% to 40 mol%, and zinc oxide (ZNO) in a content of 14 mol% to 30 mol%; a sub-component containing copper oxide (CuxOy, x=1, 2, and y=1, 2, 3) in a content of 1 mol% to 4 mol% and cobalt oxide (CoxOy, x=1, 2, 3, and y=1, 3, 4) as a remainder; and an additive including a simple substance or a compound containing sodium (Na) in a content of 10 ppm to 200 ppm.

The application provides a fluorine-free and alkali-free liquid accelerator and a preparation method and application thereof. The fluorine-free and alkali-free liquid accelerator comprises the following components in parts by weight: 40-45 parts of aluminum sulfate, 1-5 parts of amorphous aluminum hydroxide, 1-3 parts of nano iron hydroxide, 5-9 parts of alcohol amine, 0.1-0.4 parts of a stabilizer and 40-45 parts of deionized water. The nano iron hydroxide is used in the application, which serves as an alkaline agent to further promote the polymerization of aluminum sulfate and increase the stability of the system, and on the other hand, introduces high-activity iron ions to promote the generation of iron-containing ettringite and provide a crystal nucleus site for the hydration products such as ettringite, thereby reducing the setting time and promoting the early strength. After the accelerator is mixed with cement, the 1d compressive strength is greater than 16.0 MPa, the 28d compressive strength ratio is greater than 110%, and the 90d compressive strength retention rate is greater than 100%.

This invention relates to magnetosomes used in medical, biological, chemical, or cosmetic treatments using sequential laser irradiation. [Solution] Magnetosomes are placed in a part of an individual's body, and in the first step, the magnetosomes are irradiated with a laser beam of first power, and in the second step, the magnetosomes are irradiated with a laser beam of lower power than in the first step, or are not irradiated with a laser. The sequence consisting of the first and second steps is repeated at least once.

The application belongs to the technical field of comprehensive utilization of metallurgical solid waste and inorganic chemical industry, and discloses a method for preparing ferrous oxalate by taking iron hydroxide derived from cyanide tailings as iron source, which comprises the following steps: preparing ammonium ferric oxalate by using cyanide tailings leaching solution, and preparing iron hydroxide precipitate; mixing aqueous solution containing oxalic acid with the iron hydroxide precipitate to obtain raw liquid containing iron oxalate complex; controlling the molar ratio of oxalic acid to the iron hydroxide precipitate, the pH and the total concentration of C2O4 2‑ in the raw liquid containing iron oxalate complex; adding ascorbic acid into the raw liquid containing iron oxalate complex, and stirring to perform reduction reaction to obtain ferrous oxalate and post-reduction liquid; by simply adjusting the molar ratio of oxalic acid to the iron hydroxide precipitate, the pH and the total concentration of C2O4 2‑ in the reduction system, the morphology and crystal form of the ferrous oxalate are directionally controlled, and directional and efficient conversion to high-purity ferrous oxalate is realized.

The present invention provides an optimized method for recovering high-purity lithium carbonate from a lithium-containing composite oxide deposited on an eroded surface of a waste sagger discarded. Therefore, when the method for producing high-purity lithium carbonate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium carbonate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained as by-products during the production process of the lithium carbonate.

This invention relates to the field of water treatment technology, specifically to a method for preparing and applying a nano-zero-valent iron biochemical modifier. This invention prepares nano-zero-valent iron through a physical method, then disperses it with glycerol, performs primary coating with sodium carboxymethyl cellulose, and performs secondary coating with polydimethylallyl ammonium chloride. This solves the problems of agglomeration, oxidation, and storage of nano-zero-valent iron. It is then applied to biological denitrification and phosphorus removal in wastewater, enhancing denitrification in a low C / N ratio environment, reducing the dosage of phosphorus removal agents, achieving effective denitrification and phosphorus removal, and reducing the total salt content and sludge volume in municipal wastewater effluent.