120results about "Iron oxides/hydroxides" patented technology

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.

The invention discloses a clean, efficient and low-cost lithium extraction slag utilization method which comprises the following steps: mixing lithium extraction slag with a fluxing agent, and sequentially carrying out roasting treatment, solid-liquid separation treatment, aging treatment and water leaching treatment to obtain a second solid-liquid mixture; carrying out solid-liquid separation treatment on the second solid-liquid mixture to obtain a second filter residue and a second filtrate; performing carbon separation method treatment on the first filtrate to obtain a third solid-liquid mixture; carrying out solid-liquid separation treatment on the third solid-liquid mixture to obtain a third filter residue and a third filtrate; the main component of the second filter residue and the third filter residue is white carbon black; performing heat treatment on the second filtrate and the third filtrate to obtain a fourth solid-liquid mixture; performing solid-liquid separation treatment on the fourth solid-liquid mixture to obtain fourth filter residues and fourth filtrate; the main components of the fourth filter residue are aluminum hydroxide and ferric hydroxide; and separating the fourth filtrate to obtain a sodium sulfate crystal substance and a potassium sulfate crystal substance.

The invention discloses a recyclable waste lithium iron phosphate positive electrode material eutectic solvent and a recovery method, and relates to the technical field of lithium iron phosphate extraction. The catalyst is prepared by mixing a hydrogen bond acceptor and a hydrogen bond donor, the hydrogen bond acceptor is choline chloride, the hydrogen bond donor is a mixture of citric acid and ascorbic acid, the molar ratio of the hydrogen bond acceptor to the hydrogen bond donor is (0.5-2): 1, and the molar ratio of citric acid to ascorbic acid is (0.5-2): 1; by arranging the eutectic solvent mixed with the hydrogen bond donor, the purposes that lithium iron phosphate can be efficiently leached at low temperature, meanwhile, the product purity is improved, cyclic utilization can be achieved, and no waste water or waste gas is generated in the whole process are achieved.

The invention relates to the technical field of microwave absorbing materials, in particular to a method for preparing a composite microwave absorbing material from papermaking sludge and application. The method comprises the following steps: (1) drying, grinding and screening the papermaking sludge to obtain a papermaking sludge powder raw material with moderate particle size; (2) preparing a gel inducer-ferric nitrate nonahydrate solution; (3) weighing the powder raw material prepared in the step (1), dispersing the powder raw material in a ferric nitrate nonahydrate solution, stirring until the powder raw material is completely formed into gel, and drying the gel at the temperature of 100 + / -5 DEG C for 6-12 hours to prepare a honeycomb-shaped pore material; and (4) roasting the material prepared in the step (3) in an inert atmosphere at a constant temperature of 500-900 DEG C for 1-3 hours, and cooling to room temperature to obtain the catalyst. According to the method, the papermaking sludge is recycled, meanwhile, the preparation cost is low, and the prepared composite microwave absorbing material is light, efficient and excellent in performance.

The application discloses iron oxide coated silica core-shell nanoparticles and a preparation method and application thereof. The iron oxide coated silica core-shell nanoparticles comprise silica nanoparticles as an inner core and iron oxide nanoparticles as an outer shell coated on the inner core surface of the silica nanoparticles; the particle size is 22-112 nm; and the particle uniformity is 0.08-0.3. The preparation method of the iron coated silica nanoparticles provided by the application adopts the measure of adjusting the pH of slurry for multiple times, avoids the agglomeration of nanoparticles in a solution near the isoelectric point, and is thus favorable for finally obtaining core-shell nanoparticles with uniform monodispersity. No surfactant is used in the preparation process, and there is no complicated post-treatment process, thereby reducing the production cost. The uniformly monodispersed nanoparticles prepared by the method have great potential in the field of chemical mechanical polishing.

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.

The invention discloses a resourceful treatment method for stainless steel pickling waste liquid and waste water. The waste liquid is divided into high-concentration waste liquid and low-concentration waste liquid according to the acid concentration and the salt concentration to be treated respectively. Sequentially recovering gypsum, chromic hydroxide, nickel sulfide, ferrous hydroxide and manganese-rich slag from the low-concentration waste liquid through gradient precipitation; and neutralizing free acid from the high-concentration waste liquid by using ferrous hydroxide generated in a low-concentration section, cooling and crystallizing to recover ferrous sulfate, deeply removing nickel by using nickel sulfide generated in the low-concentration section, and precipitating to recover chromium hydroxide. In the whole process, generation of ferric iron is strictly controlled, and high-value productization recovery of free acid and all metals is achieved. The method has the advantages of low medicament consumption, high metal recovery rate, high product value, no secondary pollution and the like.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

The invention relates to a process for the preparation of overlithiated transition metal oxides, for example Li2NiO2, from a mixture consisting of lithium peroxide and at least one transition metal oxide or a manganese-containing spinel compound in a two-stage calcination process with respect to temperature and atmospheric composition.

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

The invention belongs to the technical field of solid waste treatment, and provides a resourceful treatment method for solid waste of an electrolytic aluminum factory. According to the method, sodium hypochlorite is added in the wet grinding process, so that cyanide in the solid waste of the electrolytic aluminum factory is oxidized into CO2 and N2, environmental pollution and safety risks caused by the solid waste of the electrolytic aluminum factory are thoroughly eliminated, and harmlessness is achieved. The fluorine source is used as the leaching agent, so that the molecular ratio of the cryolite can be adjusted, and the quality of the regenerated cryolite is improved; hydrochloric acid is used as a leaching agent, so that strict requirements on sulfur content of recycled electrolyte in an electrolytic aluminum factory are met. And meanwhile, no waste gas is generated by the resourceful treatment method. According to the resourceful treatment method, energy consumption is low, no acid mist is released in the operation process, the lithium yield is high, the lithium content in the solid waste of the electrolytic aluminum factory can be reduced to 0.025% from 0.4-2%, cryolite and carbon powder are obtained after filter residues obtained after lithium extraction through leaching are rinsed, separated and dried, and comprehensive resourceful utilization is achieved.

The present disclosure is directed to high-purity iron materials and systems and methods of producing such high-purity iron materials based on cost-effective transformation of low-cost iron feedstocks. In general, the methods of production using the systems described herein may include acid leaching low-purity iron ores to create an iron-rich acid solution, which may be purified to remove residual soluble impurities and hydrolyzed to produce high purity iron oxide powder. The high purity iron oxide powder may be reduced to form high purity iron metal suitable for a variety of end-uses, including use in batteries.

The invention relates to a positive electrode active material precursor for a lithium ion secondary battery and a method for producing the positive electrode active material precursor for a lithium ion secondary battery. A positive electrode active material precursor for a lithium ion secondary battery, the positive electrode active material precursor containing a metal composite hydroxide in the form of particles having a core-shell structure in which the surface is coated with an iron compound, the core-shell structure comprising a core part and a shell part, the core part containing nickel and aluminum as metal elements, and the shell part containing nickel and aluminum as metal elements. The core part contains iron as a metal element, when the composition of the core part is represented by Ni (1-x) Alx (OH) 2, 0.01 < = x < = 0.2, and the molar ratio (M2 / M1) of the molar amount (M1) of the metal element of the core part to the molar amount (M2) of the metal element of the shell part is M2 / M1 = 1 / 100-1 / 5.

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.

An electrode active material precursor, a preparation method thereof, an electrode active material, and a battery, the electrode active material precursor comprising carbon-complexed oxide particles, the oxide satisfying formula (1): M a O b (1) wherein M elements are selected from one or more of transition metal elements with a relative atomic mass less than 65, and can be selected from one or more of Ni, Co, Fe, Mn, Zn, Mg, Ca, Cu, Sn, Mo, Ru, Ir, V, Nb, Cr, a>0, b>0, and the powder resistivity of the carbon-complexed oxide particles is less than 100 Ω·cm.

The invention discloses a material treatment method for synchronously recycling acid and iron ions in acid mud, belongs to the technical field of solid waste treatment, and is used for solving the technical problem that in the prior art, acid and iron ions in acid mud are difficult to efficiently separate and recycle. The recycled iron oxide is obtained. The method comprises the following steps: synthesizing a cationic flocculant and pretreated silica fume, adding the pretreated silica fume and the cationic flocculant into acid mud diluted slurry to coagulate and settle impurities and metal ions, carrying out suction filtration to obtain filtrate and fluorine-containing silicon filter residues, and carrying out extraction and reverse extraction on the filtrate by using an organic extraction agent to realize efficient separation of acid and metal ions. The method comprises the following steps: recycling acid sludge to obtain recycled acid liquor, adjusting the pH value, carrying out fractional precipitation and calcining metal ions to prepare high-purity recycled iron oxide, and realizing synergistic and efficient recycling of acid and iron ions in the acid sludge.

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%.

Acidified metal oxides combined with non-acidified metal oxides used as a battery electrode active material.

To provide structural color pigments that can be manufactured more inexpensively, and to provide a more inexpensive manufacturing method for such structural color pigments.SOLUTION: There is provided a structural color pigment comprising, in sequence, a flat substrate, a crystalline layer, and a nanorod layer containing multiple nanorods, wherein the crystalline layer contains metal oxides and the nanorod contains one or more selected from the group consisting of metal oxides, metal hydroxides, and metal oxide hydroxides, and an average tilt angle of the long axis of the nanorods is within the range of ±30 degrees relative to the plane of the flat substrate (0 degrees).SELECTED DRAWING: Figure 1

The invention belongs to the technical field of secondary battery processing, and particularly relates to a preparation method of a positive electrode catalyst of a metal-air secondary battery, and the preparation method comprises the following steps: heating a metal salt solution to 80-100 DEG C at a constant temperature, and dropwise adding ammonia water to adjust the pH value to be greater than 8.5; adding an amine compound into the mixed solution, stirring for 1 hour, and adding acetic acid to adjust the pH value to 7.5-8.0; evaporating the solvent at constant temperature to obtain a precursor, crushing and grinding for later use; and sintering the precursor in argon or hydrogen-argon mixed gas at a high temperature of 700-900 DEG C for 6-12 hours to obtain the carbon nanotube coated metal oxide catalyst. The positive electrode catalyst of the metal-air battery with the carbon nano tube coated with the metal oxide is obtained through a pyrolysis method, and the catalyst can fully expose active sites, promote adsorption and desorption of intermediates, accelerate electron transport and reduce reaction energy barriers, so that the charge-discharge overpotential is greatly reduced, and the service life of the battery is prolonged. And the metal-air secondary battery with more excellent cycling stability can be realized.

The invention relates to the technical field of resource recycling of tungsten slag, in particular to a resource recycling method of tungsten slag. The resource recycling method for the tungsten slag is easy to operate, high in organic metal recycling rate, good in purification effect, low in energy consumption, high in medium complete recycling resource utilization rate and wide in application prospect.

To provide a method for producing an anion adsorbent that is excellent in recovery rate.SOLUTION: Provided is a method for producing an anion adsorbent in which iron (III) chloride and a silicon-containing compound are dissolved in water to prepare an aqueous solution, and the iron (III) chloride and the silicon-containing compound are reacted in the aqueous solution to produce an anion adsorbent in the aqueous solution.SELECTED DRAWING: None

The invention relates to a method for preparing light magnesium carbonate based on carbon dioxide mineralized serpentinite, which comprises the following steps: mixing serpentinite powder and ammonium sulfate for low-temperature synergistic activation to realize efficient conversion of magnesium element and produce byproduct ammonia gas at the same time; magnesium-silicon separation is achieved through water medium selective leaching, and active silicon slag is generated; accurately regulating and controlling the pH value, and selectively precipitating the iron oxide yellow byproduct to obtain pure magnesium liquid; cO2 is introduced into the pure magnesium liquid for a carbonation reaction, high-purity light magnesium carbonate is prepared, and precipitated mother liquor is obtained; and the closed-loop circulation of the ammonium sulfate reagent is realized through evaporative crystallization of the mother liquor. According to the method, all traditional waste residues are creatively converted into high-value products, the process economy is remarkably improved, meanwhile, the method has the outstanding advantages of being low in energy consumption, high in reagent recycling rate, environmentally friendly and the like, and a brand new technical path is provided for recycling of serpentinite solid waste and carbon emission reduction.

The invention relates to the technical field of chlor-alkali industry, in particular to a chlor-alkali industry salty mud resource utilization device and method.The chlor-alkali industry salty mud resource utilization device comprises a washing pool used for washing salty mud to melt sodium chloride in the salty mud; the first filter press is used for separating a solution containing sodium chloride from the dry salty mud material; the calcium chloride production device comprises a reaction tank for the reaction of limestone and hydrochloric acid, and a neutralization tank for adding alkali for neutralization, the reaction tank is used for receiving the separated dry salty mud material; according to the chlor-alkali industry salty mud resource utilization device and method, calcium ions in calcium carbonate are recycled, and sodium chloride and magnesium hydroxide are recycled, so that recycling is more thorough.

The invention relates to ferric hydroxide modified diatomite, a preparation method and application in ASFV detection, and belongs to the technical field of virus detection. The invention provides a preparation method of ferric hydroxide modified diatomite. The preparation method comprises the following steps: (1) dropwise adding a saturated FeCl3 solution into water, and stirring to obtain Fe (OH) 3 colloid; and (2) mixing the Fe (OH) 3 colloid obtained in the step (1) with diatomite, and drying to obtain the ferric hydroxide modified diatomite. The ferric hydroxide modified diatomite prepared according to the method has a good concentration effect on ASFV, the ferric hydroxide modified diatomite is adopted to concentrate a sample which is extremely low in ASFV pathogen content and is negative through conventional qPCR detection, the amplification efficiency of the detected sample can be improved, the CT value of the sample is reduced by 1.5-3, and the detection sensitivity is improved. The sensitivity and the accuracy of sample detection are improved.

To provide a method enabling isolated collection of an element from a black mass.SOLUTION: A method includes the steps of: adding an alkaline solution to a black mass and obtaining a first effusion liquid and a first solid residue; adding an acid solution to the first solid residue for a first duration thereby obtaining a second effusion liquid; passing the second effusion liquid through a first ion exchange column, holding fluoride ion from the second effusion liquid in the first ion exchange column thereby obtaining a first eluate; passing the first eluate through a second ion exchange column, holding copper ion from the first eluate in the second ion exchange column thereby obtaining a second eluate; increasing pH of the second eluate, adding a predetermined amount of phosphoric acid to the second eluate thereby obtaining a first solution and a phosphoric acid (III) deposit; adding the first effusion liquid and the first solution together thereby obtaining a second solution; and adjusting pH of the second solution thereby a residual deposit and a lithium solution.SELECTED DRAWING: Figure 1

Sulfur-incorporated bismuth ferrite nanoparticles (SBFNPs) contain Bi2Fe4O9 nanoparticles doped with Fe(0) and Bi(0) and sulfur in an amount of 0.5 to 5 percent by weight. At least a portion of bismuth is bonded to at least a portion of the sulfur and at least a portion of iron is bonded to at least a portion of the sulfur. The bismuth ferrite nanoparticles have a longest dimension of 1 to 50 nm. A method of photocatalytic degradation of dyes and a method of hydrogen generation and storage using the nanoparticles.

A positive electrode active material precursor for a lithium-ion secondary battery, containing a metal composite hydroxide, whereinthe metal composite hydroxide is in a form of a particle having a core-shell structure whose surface is coated with an iron compound,the core-shell structure is constituted by a core portion and a shell portion,the core portion contains nickel and aluminum as metal elements,the shell portion contains iron as a metal element,when a composition of the core portion is represented by Ni(1-x)Alx(OH)2,0.01≤x≤0.2 is satisfied,anda molar ratio (M2 / M1) between a molar amount M1 of the metal element in the core portion and a molar amount M2 of the metal element in the shell portion satisfiesM2 / M1=1 / 100⁢ to⁢ 1 / 5.

Various processes, apparatus, systems, and methods for improved extraction of metallic iron from iron ore sources are disclosed. Thermal reduction pre-treatment is used to reduce a starting iron-containing feedstock material, for example, hematite, to a thermally reduced material having a net iron oxidation of approximately +2. For example, disclosed is a method for producing metallic iron from a starting iron-containing feedstock material, the method comprising: processing the starting iron-containing feedstock material to form a pre-leach material, wherein the starting iron-containing feedstock material comprises one or more iron ores; wherein the step of processing comprises thermally reducing the starting iron-containing feedstock in the presence of a reducing atmosphere to form a thermally-reduced material; wherein the thermally reduced material is characterized by a lower net iron oxidation state than that of the starting iron-containing feedstock material; and wherein the pre-leach material comprises at least a portion of the thermally-reduced material.