220results about "Iron oxides/hydroxides" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention discloses a chlorobenzene wastewater continuous stripping purification recovery device and an implementation method, the chlorobenzene wastewater continuous stripping purification recovery device comprises an aeration tank, an alkali water washing system, an acid water washing system, an acid-base neutralization system and a ferric hydroxide separation system, the aeration tank is connected with the alkali water washing system, the acid water washing system is connected with the alkali water washing system, and the acid water washing system is connected with the ferric hydroxide separation system. The acid-base neutralization system is connected with the alkali-water washing system, the acid-water washing system and the ferric hydroxide separation system, and the alkali-water washing system and the acid-water washing system are both in two-stage steam stripping, and have the following advantages: alkali washing water and acid washing water generated in the chlorobenzene production process are subjected to two-stage nitrogen steam stripping, so that the content of organic matters is greatly reduced; ferric hydroxide is generated through neutralization of acid-alkali wastewater, the total amount of the wastewater is reduced, then the ferric hydroxide reacts with hydrochloric acid in the pickling water to generate ferric trichloride, hydrochloric acid is neutralized, the neutralization product ferric hydroxide is consumed, the wastewater amount is reduced, and recycling of wastewater resources is achieved.

The invention discloses a device and a method for regenerating a powdery iron oxyhydroxide desulfurizer and purifying sulfur, and the device and the method are characterized in that invalid iron oxyhydroxide is completely reduced into a ferrous oxide and ferrous sulfide after sulfide is added, the reaction of an iron compound is enhanced through ultrasound and stirring, and the separation of the iron compound and the sulfur is promoted. Further fully aerating to fully oxidize the ferrous iron to generate new iron oxyhydroxide; at the moment, the iron oxyhydroxide is in a completely dispersed state, the single particle size is not higher than 1 micron, and small flocs with the particle size of 0-5 microns are formed in laminar water; the surface of the sulfur has hydrophobicity, and the sulfur is gathered to generate hydrophobic self-flocculation, so that large flocs with the particle size of 30-300 microns are formed in the laminar water; the mixture is flushed by water flows with different flow speeds, the iron oxyhydroxide with small particle size is flushed out at a certain flow speed, and the sulfur with large particle size is suspended in the grading pipe, so that the regeneration of the iron oxyhydroxide desulfurizer and the purification of the sulfur are realized.

The invention relates to a method for recycling aluminum, iron and lithium from waste lithium iron phosphate batteries. The method comprises the following steps: firstly, separating a positive electrode material of a waste battery cell, removing a binder through high-temperature treatment, adding the positive electrode material into a NaOH solution and a viscous liquid cosolvent, finally stirring and dissolving, neutralizing and adjusting the pH value through sulfuric acid, and precipitating and recovering aluminum; then sulfuric acid is matched with hydrogen peroxide, residual filter residues are stirred and dissolved, the pH value is adjusted in multiple steps, iron and lithium are precipitated respectively, and Fe (OH) 3 and Li2CO3 precipitates are obtained in sequence; the viscous liquid cosolvent disclosed by the invention is prepared from 1-aminoethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt and boric acid powder; the recovery rate of aluminum, lithium and iron is high, the recovery cost is low, and the economic value is high.

Provided is a hydrogen sulfide removing agent that can be stably used while maintaining hydrogen sulfide removing ability equivalent to that of a hydrogen sulfide removing agent comprising an amorphous iron oxyhydroxide. This iron oxyhydroxide-based hydrogen sulfide removing agent contains amorphous iron oxyhydroxide and a crystalline component. The content of the amorphous iron oxyhydroxide is not less than the content of the crystalline component.

The invention discloses a method for recovering Mo and Fe from direct coal liquefaction oil residues, and belongs to the technical field of hydrometallurgy. The method comprises the steps of solvent extraction, roasting enrichment, wet leaching, extracting agent extraction, ammonia water reverse extraction and evaporative crystallization, and ammonium molybdate and Fe (OH) 3 are obtained. Wherein in the wet leaching process, a leaching aid and sulfuric acid are jointly used for leaching, so that Ca and Si in the oil residues are left in leaching residues, and Mo, Fe, Al and the like enter a solution. The method comprises the following steps: simultaneously extracting Mo and Fe from a solution by using an extracting agent, precipitating Fe in a Fe (OH) 3 state by using an ammonia water reverse extraction method, leaving Mo in a reverse extraction solution in the form of ammonium molybdate, and further evaporating and crystallizing the reverse extraction solution to obtain the ammonium molybdate. According to the method, two valuable metals Mo and Fe in the direct coal liquefaction oil residue can be effectively recovered, and resource recycling is facilitated.

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 comprehensive utilization method of refining slag, which comprises the following steps: dissolving the refining slag in hydrochloric acid to obtain a refining slag pickle liquor; filtering the refining slag pickle liquor to obtain first filtrate and filter residues, and washing the filter residues to obtain first solid and first washing liquor; combining the first washing liquid and the first filtrate to obtain a second mixed solution; and adding an oxidizing agent into the second mixed solution to obtain a first precipitate. According to the method, the refining slag is subjected to acid leaching with hydrochloric acid, the PH value of the solution is adjusted, silicon dioxide, aluminum hydroxide, ferric hydroxide, calcium chloride or calcium oxide and recycled hydrochloric acid are obtained, the accumulated refining slag is decomposed into various new substances in the process reaction, the method is simple, the substance purity is high, the refining slag is recycled, and large economic value can be created; and meanwhile, mining of various resources is reduced. And a new direction is found for comprehensive utilization of the refining slag.

The invention discloses a high-entropy double hydroxide / carbon fiber aerogel electromagnetic wave-absorbing material and a preparation method thereof, and the method specifically comprises the following steps: (1) activating green algae to obtain carbon fibers, and freeze-drying the carbon fibers to obtain aerogel carbon fibers; (2) immersing the aerogel carbon fiber subjected to heat treatment into a high-entropy layered double hydroxide precursor solution for hydrothermal reaction, and obtaining a high-entropy double hydroxide / carbon fiber aerogel material after the reaction; wherein the temperature of the hydrothermal reaction is 115-120 DEG C, and the reaction time is not less than 5 hours; and (3) freeze-drying the aerogel material obtained in the step (2) to obtain a target product. The high-entropy double hydroxide / carbon fiber aerogel electromagnetic wave-absorbing material disclosed by the invention can realize low-frequency absorption of 2.46 GHz under 2 to 8 GHz, and can realize broadband absorption of 12.44 GHz under 2 to 18 GHz.

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.

Described are methods for producing industrial gases (e.g., hydrogen, ammonia, and / or methane) using ferrous iron-containing materials (e.g., olivine) while concurrently sequestering carbon dioxide. The process may involve mixing a ferrous iron-containing material with water and, in some examples, a reaction accelerant. The mixture may be heated to 100-300°C to initiate the oxidation of ferrous cations (Fe2+) to ferric cations (Fe3+) while reducing hydrogen (from water) and / or methane (from water and carbon dioxide, when carbon dioxide is introduced into the ferrous iron-containing mixture). In some examples, carbon dioxide may be added later (after recovering hydrogen) to form carbonates. Specifically, carbon dioxide may be injected at a high pressure (e.g., about 200 bar) post-oxidation to facilitate mineralization, using the exothermic reaction to maintain a favorable temperature. In some examples, metal complexing / chelating reagents are added to bind trace metals such as nickel, copper, cobalt, and platinum group metals for recovery.

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.

A Method is provided for the hydrometallurgical production of Iron, Lead and Silver from Red Mud and Slug of pyrometallurgy and other similar type of secondary concentrates - residues of production processes, with high concentrations of Iron, Lead and Silver, as well as from residues of Copper White Dust -dust from converters. By applying the proposed method, it is possible to hydrometallurgical production of Iron, Lead and Silver efficiently, from the specific materials, which come from pyrometallurgical methods and other metal production. This specific method enables the hydrometallurgical extraction - production of iron, Lead and Silver from the specific residues of hydrometallurgical and pyrometallurgical processes, using new chemical solutions and processing lines, which until now could not be processed efficiently and essentially remained unutilized, due to low concentrations or due to the chemical compounds in which the metals were found, rendering them non-recoverable.

The invention relates to a method for recycling valuable resources from a waste lithium iron phosphate material, and belongs to the technical field of recycling of waste lithium iron phosphate batteries. The method comprises the following steps: dispersing a waste lithium iron phosphate material in water to obtain a mixture I; respectively adding an acid solution and an oxidant solution into the mixture I at the same time to carry out leaching reaction, and carrying out solid-liquid separation to obtain a leaching solution A and active ferrophosphorus slag; iron powder and the leachate A are subjected to a replacement reaction to recover copper in the leachate A, and copper sponge and lithium-rich leachate are obtained; and calcining the active ferrophosphorus slag for crystal transformation to obtain decarbonized ferrophosphorus slag, the decarburized ferrophosphorus slag is mixed with alkali liquor, the mixture is placed in a mill to be subjected to ball-milling leaching, and leachate B and ferric hydroxide are obtained; and adjusting the pH value of the leachate B to be alkaline to obtain an aluminum hydroxide and phosphate solution. The method provided by the invention is simple to operate and low in cost, has good economic benefits and is easy for industrial application.

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.

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include reacting a feed material comprising at least two metals selected from the group consisting of iron, magnesium, and calcium with a weak acid to produce a first leachate comprising ions of the at least two metals and an insoluble product; reacting the first leachate with a base to produce a first solid product comprising a first metal and a second leachate comprising ions of a second metal different from the first metal; and reacting the second leachate with the base to produce a second solid product comprising the second metal and a third leachate.

A method of making a material for capturing carbon dioxide from the earth's atmosphere, comprises producing an acid and a base with an electrochemical acid-base generator; dissolving a mineral in the acid to produce a mineral rich solution, separating silica from the mineral rich solution to form a silica depleted solution; adding a first portion of the base to the silica depleted solution to remove impurities by precipitation, adding a second portion of the base until ferrous hydroxide (Fe(OH)2) precipitates, then pausing base addition and removing the ferrous hydroxide precipitate from the solution. Then adding a third portion of the base to the iron-depleted solution to precipitate magnesium hydroxide (Mg(OH)2) and / or calcium hydroxide (Ca(OH)2). Then recovering a salt solution and directing the recovered salt solution to the electrochemical acid-base generator to produce a new acid and a new base. The magnesium hydroxide and / or calcium hydroxide may be used to capture and sequester carbon dioxide from a CO2-containing gas (e.g., air) by forming a carbonate or from the ocean by forming bicarbonate.

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 discloses a method for recovering iron resources from jarosite, which comprises the following steps: S1, reacting ammonium oxalate with jarosite to realize jarosite phase dissolution: mixing jarosite with ammonium oxalate, and heating and reacting in a water reaction system to generate ammonia gas to obtain leached residues and leached liquid; s2, the leachate reacts with ammonia to precipitate and separate iron, and ammonium oxalate is recycled: S2.1, the leachate reacts with the ammonia: ammonia gas is introduced into the leachate or ammonia water is added into the leachate for full reaction, and reaction product slurry containing ferric hydroxide precipitate and ammonium oxalate is obtained; and S2.2, separating ferric hydroxide and ammonium oxalate from the reaction product slurry: filtering and separating to obtain a ferric hydroxide precipitate, and cooling to separate out crystals from ammonium oxalate in the filtrate so as to recover ammonium oxalate. According to the method, ammonium oxalate used for replacing iron in the iron vitriol can be recycled, the raw material cost is low, iron element separation and utilization are achieved, solid waste is remarkably reduced, and enrichment of other valuable elements in the iron vitriol is facilitated.

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.

The invention discloses a method for recovering a titanium dioxide byproduct ferrous sulfate. The method comprises the following steps: S1, dissolving a titanium dioxide byproduct ferrous sulfate in water, and filtering to obtain a first filtrate; s2, adjusting the pH value of the first filtrate to 4.5-5.5, and filtering to obtain a second filtrate; s3, adding sulfide into the second filtrate, and filtering after reaction to obtain third filtrate; s4, adding an alkaline liquid into the third filtrate, and filtering after reaction to obtain a fourth filtrate and a first filter cake, so as to obtain ferrous hydroxide with first purity; and S5, preparing ferrous oxalate dihydrate from the ferrous hydroxide with the first purity. According to the method, through the synergistic effect of accurate pH value control, sulfide impurity removal and fractional precipitation, efficient separation of iron and manganese is achieved, the complex impurity removal process of multiple oxidation reduction is avoided, the operation process is simple, ferrous oxalate dihydrate is prepared after high-purity ferrous hydroxide is prepared, and the impurity removal cost is low.

This invention relates to a method for preparing a highly efficient self-supporting oxygen evolution electrocatalyst using a cation exchange method. It addresses the problems of poor conductivity and limited active sites in existing nickel-iron double hydroxide catalysts. The preparation method includes: 1. Preparing a precursor using a hydrothermal method; 2. Immersing the precursor in a chemical bath. This invention is used to prepare a highly efficient self-supporting oxygen evolution electrocatalyst using a cation exchange method.

The invention provides a treatment method of chlorination process titanium dioxide solid waste residues, and belongs to the technical field of resources and environments. According to the method, the chlorination process titanium dioxide solid waste residues are dissolved and extracted step by step, high-value metal in the solid waste residues is recycled respectively, residual substances are evaporated and crystallized to obtain mixed salt, and zero emission and full resource utilization of the solid waste residues are achieved.

The present invention belongs to the field of catalyst preparation technology, specifically to a method for preparing a CoNiFe-based catalyst for hydrogen production by water electrolysis. A CoNiFe-based precursor is first calcined to obtain a metal oxide powder, which is then mixed with carbon black and ball-milled before secondary calcination to obtain the CoNiFe-based catalyst. This catalyst is then loaded onto a carbon paper surface as a working electrode to construct a three-electrode system for water electrolysis, exhibiting dual catalytic performance for both OER and HER.

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.