214 results about "Ferrous salts" patented technology

The preparation method comprises the following steps: S1, preparing a phosphoric acid solution, a hydrogen peroxide solution, a Ti salt, a phosphor salt solution and a ferrite solution; s2, Ti salt and the ferrite solution are mixed, and a titanium iron salt solution is obtained; mixing the phosphoric acid solution and the phosphorus salt solution to obtain a phosphorus source solution; s3, adding the titanium iron salt solution into a reaction kettle, and adding the hydrogen peroxide solution; s4, adding the phosphorus salt solution into the reaction kettle to obtain yellow slurry; s5, after the color of the slurry is heated to be white, white slurry is obtained; s6, carrying out solid-liquid separation on the white slurry to obtain an iron phosphate dihydrate filter cake; and S7, drying and calcining the iron phosphate dihydrate filter cake to obtain the Ti-doped battery-grade anhydrous iron phosphate. The titanium-doped iron phosphate is firstly prepared by a one-step method, the pH value of the reaction system is controlled by controlling the molar ratio of the iron element to all phosphorus elements in total phosphorus, ammonium phosphate and phosphoric acid in the reaction system, and the retention of the Ti element in the finished product and the regulation and control of the iron-phosphorus ratio in a specified range are ensured.

The present solution provides a preparation method for a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability, including following steps: preparing a ferrous ion-containing solution for providing ferrous ions, where the ferrous ion-containing solution includes a soluble ferrous salt and a surfactant but no oxidizing ions, and the ferrous ion-containing solution is maintained in an acidic environment; preparing an initial mixed solution for providing phosphate ions and ammonium ions; and performing ultrasonic refinement, heating, and holding on the intermediate mixed solution using an auxiliary device with ultrasonic oscillation and microwave heating functions to obtain a final mixed solution; and filtering out precipitates from the final mixed solution, and then transferring the precipitates to a vacuum environment for high-temperature heating treatment to obtain a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability.

The invention discloses a vanadium iron-site doped iron phosphate material and a preparation method, and relates to the technical field of lithium ion battery positive electrode material preparation, pure water is used as a base solution, and a vanadium salt solution with the pH value of 2.0-3.0, a ferrite solution with the pH value of 1.0-2.5 and a phosphorus-oxygen mixed solution with the pH value of 5.0-7.0 are simultaneously added into a reaction kettle in a three-strand parallel flow mode for a co-precipitation reaction. By controlling the acid environment of a key solution system, reduction of metavanadate radicals or generation of ferric vanadate precipitates is effectively inhibited, and vanadium elements are successfully and uniformly doped to iron sites of iron phosphate crystal lattices; the mass ratio of iron to phosphorus in the obtained iron phosphate material is stabilized at 95-98%, the doping amount of vanadium is 100-10000 ppm, and the vanadium is uniformly distributed. Lithium iron phosphate prepared by taking the material as a precursor has higher discharge capacity and compaction density, and the electrochemical performance of a lithium ion battery is remarkably improved.

The invention provides continuous wastewater treatment equipment, which belongs to the technical field of wastewater treatment, and comprises a treatment tank and an observation window arranged in the middle of the treatment tank, and further comprises a multi-stage treatment assembly, a pollution discharge purification assembly and a stripping assembly, deep purification of the wastewater is realized through multi-stage treatment; the vertical spraying is combined with the stirring of the fan blades and the scrapers, strong water flow scouring force is formed above the elastic filter plate, meanwhile, the convex plates periodically extrude the elastic filter plate during rotation to enable the elastic filter plate to vibrate, suspended particles and impurities can be effectively prevented from being accumulated on the surface of the elastic filter plate, the risk of filter plate blockage is reduced, and meanwhile, the service life of the filter plate is prolonged. Ferric hydroxide colloid generated by ferrite reaction can more uniformly adsorb suspended particles under the driving of upper and lower water flows, and the precipitation separation of the suspended particles is accelerated; the connecting shaft rotates to drive the mounting cylinder, the arc-shaped groove of the trigger cavity is matched with the ball, the oxidation disc vibrates, the vibration strength is adjusted according to the descending amplitude of the oxidation disc, and the overall wastewater treatment efficiency is improved.

The invention relates to the technical field of soil remediation, and discloses a soil remediation material for targeted adsorption of perfluoroalkyl acid organic pollutants and a preparation method of the soil remediation material. The soil remediation material is prepared from the following raw materials: microorganisms, a porous carrier, cationic gel, anionic gel and ferrite, wherein the microorganisms have the capability of driving a nitric acid reduction-ferrous oxidation process. According to the soil remediation material provided by the invention, the microorganisms with the capability of driving the nitric acid reduction-ferrous oxidation process, the porous carrier, the cationic gel, the anionic gel and the ferrite are used as raw materials, and the mechanical strength change of the material in different application stages is dynamically regulated and controlled through the valence change of iron ions and the mineralization process of the microorganisms; according to the soil remediation material disclosed by the invention, the miscibility of the soil remediation material and soil and the specific adsorption of the medium-short-chain perfluoroalkyl acid are enhanced, and meanwhile, the conversion of pollutants from an extractable state to a non-extractable state can be promoted, so that the deep fixation of the pollutants is realized, and the secondary release risk after fixation is reduced.

The invention belongs to the field of field remediation functional materials, and particularly relates to a preparation method and application of a chelating iron agent for remediation of organic contaminated soil. The preparation method comprises the following steps: firstly, preparing a chelating agent aqueous solution, adding ferrite under a continuous stirring condition to carry out chelation reaction, then adding organic acid to carry out stabilization treatment, finally adding an activating auxiliary agent fulvic acid, uniformly mixing, and adjusting the pH value of the solution to a required value to obtain the chelating iron agent. The chelating iron agent can be used for activating an oxidizing agent during in-situ / ex-situ remediation of an organic polluted site, and has the advantages that the chelating iron agent is environment-friendly, the ferrous ion stability is good, the contact reaction with the oxidizing agent is mild and controllable, iron precipitates are not easy to form, and the growth and metabolic activity of indigenous organisms are stimulated.

The invention discloses a treatment method of electroplating wastewater, and belongs to the technical field of electroplating wastewater treatment. The process comprises the following steps: electrically adjusting the pH value of the electroplating wastewater to 2.5-4.0, adding ferrite, adopting a Ti / PbO2 anode and a graphite cathode, controlling the current density to 15-30mA / cm, introducing air, reacting for 40-80 minutes, and adjusting the pH value to 6.0-7.0 after the reaction; introducing the wastewater into a chelating resin column, wherein the chelating resin is an amino phosphonic acid type or iminodiacetic acid type; the method comprises the following steps of: introducing into a built-in filter column, loading two layers of recrystallized silicon carbide honeycomb ceramic membranes in the filter column in parallel, performing cross-flow filtration under the conditions that the operation pressure is 0.8-2.0 MPa, the temperature is 25-40 DEG C and the cross-flow velocity is 1.5-3m / s, and collecting permeate; the permeate liquid is used for backwashing every 8-12 hours of operation. According to the method, heavy metal ions in the electroplating wastewater can be effectively removed, and the treatment efficiency of the electroplating wastewater is improved.

This application relates to the field of chemical production and discloses a metal salt catalyst for desulfurization and denitrification, its preparation method, and its application. The catalyst comprises an active metal component of 30%-35%, a support of 60%-65%, and an additive of 5%-10%. The active metal component is specifically ferrous sulfate. The activity of the ferrous salt at medium and low temperatures, combined with the adjustment of the catalyst surface acidity by alkali metal sodium and rare earth element cerium, broadens the active temperature range. The support is specifically alumina. The additives consist of 3%-6% alkali metal sodium and 2%-4% rare earth element cerium by mass. Simultaneously, alkali metal sodium and rare earth element cerium can reduce impurity adsorption and enhance resistance to poisoning. This invention, through the rational selection of the active metal component, support, and additives, broadens the active temperature range of the catalyst, enabling it to adapt to flue gas temperature changes under different operating conditions, thus providing a wider range of applications for desulfurization and denitrification in industrial production.

This invention discloses an in-situ removal process for total inorganic iodide in water based on oxidation-adsorption, belonging to the field of water treatment technology. The process includes: first, taking raw water containing inorganic iodide, adding bicarbonate and adjusting the pH of the solution to 7-7.5; then, adding ferrous salt to the raw water; finally, adding KMnO4 to the raw water with added ferrous salt under stirring conditions, reacting to prepare a MnO2-nascent iron particle complex; on the one hand, promoting the removal of total inorganic iodide from water through mild oxidation-adsorption. ‑ Oxidation transformation occurs to generate HOI / I2; on the other hand, the in-situ products HOI / I2 are adsorbed and fixed through adsorption / co-precipitation methods, and nascent iron is captured through surface coordination or electrostatic adsorption. This invention achieves the capture of I2 under neutral / weakly alkaline drinking water conditions through a mild and controllable oxidation-adsorption synergistic mechanism. ‑ Simultaneous adsorption and removal of its conversion products are achieved to ensure that total iodine is removed to the required standard.

The application discloses a method for synthesizing tervalent tetraaryl iron porphyrin from pyrrole, aromatic aldehyde and ferrous salt, which comprises the following steps: adding anhydrous aluminum chloride, aromatic aldehyde, pyrrole and ferrous salt into DMF under stirring, and then heating and refluxing the reaction mixture for 0.5 hours under nitrogen; removing the nitrogen and continuing to heat the reaction mixture for a certain time; stopping the reaction; cooling the reaction mixture; and placing the reaction mixture at 273K overnight; and finally filtering the reaction mixture to obtain the iron porphyrin.

The invention relates to the technical field of environmental functional material preparation, in particular to magnetic ferro-aluminum loaded modified sludge hydrothermal carbon as well as a preparation method and application thereof, and the sludge hydrothermal carbon prepared by a hydrothermal carbonization technology is a porous carbonaceous carrier with high specific surface area and rich oxygen-containing functional groups. A product obtained from the sludge hydrothermal carbon, an aluminum precursor, ferrous salt and ferric salt through an impregnation precipitation method is porous sludge carbon loaded aluminum iron oxide (mainly Fe3O4), and efficient chemical adsorption of fluorine ions is achieved through rich acidic functional groups and metal oxide active sites on the surface of the product. Adsorption mainly depends on complexation, exchange and surface combination of phases such as Al (OH) 3 and fluorine ions, and the magnetic ferro-aluminum loaded modified sludge hydrothermal carbon can be rapidly recycled through an external magnetic field after adsorption, so that secondary pollution is avoided, and therefore, the magnetic ferro-aluminum loaded modified sludge hydrothermal carbon has the dual advantages of efficient fluorine removal and magnetic recovery.

The invention provides a preparation method of manganese-doped iron phosphate, and relates to the technical field of lithium ion battery positive electrode materials, the preparation method comprises the following steps: S1, preparing a phosphoric acid solution, a ferrite solution, a phosphorus-oxygen mixed solution containing a phosphorus source and an oxidizing agent, a divalent manganese salt solution and an oxidizing agent solution; s2, adding a base solution, and pumping the ferrite solution and the phosphorus-oxygen mixed solution while stirring to obtain slurry A; s3, filtering and washing the slurry A to obtain a filter cake; s4, mixing and pulping the filter cake and water, sequentially adding a divalent manganese salt solution, an oxidant solution and phosphoric acid, heating to 80-100 DEG C, and carrying out conversion reaction for 1-3 hours to obtain slurry B; s5, filtering, washing and drying the slurry B to obtain manganese-doped iron phosphate dihydrate, and calcining the iron phosphate dihydrate to obtain manganese-doped anhydrous iron phosphate; the manganese salt solution is added in the precursor preparation stage, so that the manganese element is doped into iron phosphate crystal lattices in the form of ions, and the bulk phase doping effect can be better improved.

This invention provides a lithium iron phosphate cathode material, its preparation method, and its application. The preparation method includes the following steps: (1) mixing ferrous salt and phosphorus source with an alcohol solvent, heating and stirring, and adding a first lithium source solution to obtain a mixed solution; adjusting the pH of the mixed solution to obtain a mixed precursor; (2) mixing a complexing agent, ferric salt, a second lithium source, phosphorus source, and surfactant with water, stirring to form a sol solution; mixing the mixed precursor obtained in step (1) with the sol solution, heating and stirring to obtain a gel precursor; (3) sintering the gel precursor to obtain the lithium iron phosphate cathode material; wherein the mixed precursor includes lithium phosphate and ferrous phosphate. This invention can achieve lithium iron phosphate gradation of different particle sizes through a single production line, improving the uniformity and compaction density of the material, and avoiding performance differences and poor stability between different batches.

The application discloses a high specific surface area desulfurizer hydrated iron oxide component and a preparation method thereof. First, an iron source ferrous salt and a precipitant are respectively dissolved completely by being heated to 40 DEG C, then the precipitant is put into the ferrous salt solution to carry out stirring and mixing reaction, pH is kept at 6.5-9.5, then small molecule organic alcohol, acid or amine substance is added, air is introduced to carry out oxidation reaction, finally, the material liquid is filtered, rinsed and dried, and the high specific surface area hydrated iron oxide desulfurizer active component is obtained. The preparation method of the high specific surface area hydrated iron oxide desulfurizer active component has the advantages of mild reaction condition, simple technological process, low production cost, non-toxic and non-pollution, and the specific surface area of the prepared hydrated iron oxide is greatly improved, the sulfur capacity is as high as 60.85%, and the method has good application prospect and potential practical value.

The invention discloses antioxidant neodymium iron boron permanent magnet powder and a preparation method thereof, and the preparation method comprises the following steps: mixing neodymium iron boron permanent magnet powder, a polyvinylpyrrolidone solution, a sodium borohydride solution and a ferrite solution under an anoxic condition, and carrying out a hydrothermal reaction to obtain the antioxidant neodymium iron boron permanent magnet powder. According to the oxidation-resistant neodymium-iron-boron permanent magnet powder prepared by the preparation method disclosed by the invention, a compact oxidation-resistant shell protection layer is formed on the surface of the neodymium-iron-boron permanent magnet powder, so that oxygen and moisture are effectively blocked, the magnetic powder is prevented from being oxidized, the service life of the magnetic powder is prolonged, and the magnetism of the permanent magnet powder can be ensured not to be influenced; the optimal balance between the anti-oxidation protection and the magnetic performance maintenance of the neodymium-iron-boron permanent magnet powder is realized; meanwhile, the permanent magnet powder does not need to be isolated from air, subsequent neodymium-iron-boron magnet manufacturing can be carried out in the air, the storage cost is reduced, safe use of the permanent magnet powder is guaranteed, and the permanent magnet powder is suitable for large-scale batch continuous production.

The invention belongs to the technical field of semiconductor material polishing, and particularly relates to an alkaline polishing solution for a silicon carbide substrate as well as a preparation method and application. According to the alkaline polishing solution for the silicon carbide substrate, the colloidal SiO2 nano abrasive and the alpha-Al2O3 nano abrasive are used as compound abrasive, the particle size of the alpha-Al2O3 nano abrasive is controlled to be smaller than that of SiO2 nano abrasive in the colloidal SiO2 nano abrasive, the pH is adjusted to be 9.5-13.0, and components such as ferrite, oxidizing agent hydrogen peroxide and sodium pyrophosphate are added; bulges and defect layers on the surface of the silicon carbide substrate can be quickly removed in the polishing process, and Rad can be efficiently obtained; the alkaline polishing solution is a high-performance alkaline polishing solution for the silicon carbide substrate, and the technical problem that in the prior art, the polishing solution is low in performance can be solved.

The application discloses a low-temperature lithium iron phosphate material and a preparation method and lithium ion battery thereof, and belongs to the technical field of lithium ion batteries. The preparation method is as follows: a ferrous salt and a polycarboxylic acid complexing agent containing alpha-hydroxyl are mixed and dissolved in water, then a phosphoric acid solution and a lithium source solution are introduced, and the pH in the system is controlled to be less than or equal to 3; the solid product is washed and dried after being reacted at 20-55 DEG C for 4-8 hours to obtain a precursor; the precursor, a carbon source, phosphoric acid and a dopant are sand-milled to obtain a slurry; the slurry is subjected to spray drying, sintering and crushing to obtain the low-temperature lithium iron phosphate material. The application can realize directional growth of lithium iron phosphate crystal grains, obtain micron-level flat-structure lithium iron phosphate, and make the material maintain high tap density (greater than or equal to 2.5 g / cm 3 ) while keeping good low-temperature performance.

The invention discloses a preparation method of a glucose-iron-zinc double complex, which comprises the following steps: dissolving glucose in water, adding ferrite under a stirring condition, uniformly stirring, adjusting the pH value to 7.5-8.5 by using a sodium hydroxide aqueous solution, and stirring and reacting at 70-90 DEG C for 1-2 hours to obtain a reaction solution A; adding zinc salt into the reaction liquid A, uniformly stirring, adjusting the pH value to 8.0-9.0 by using a sodium hydroxide aqueous solution, and stirring and reacting at 70-90 DEG C for 1-2 hours to obtain a reaction liquid B; and carrying out microwave treatment on the reaction liquid B, adding an ethanol water solution under a stirring condition, standing at normal temperature, separating out precipitate, and carrying out vacuum drying on the precipitate to obtain the glucose-iron-zinc double complex. Glucose sequentially reacts with ferrous salt and zinc salt, metal ions are complexed, the glucose-iron-zinc double complex is prepared, and the glucose-iron-zinc double complex is good in stability, good in solubility and easy to absorb, is added into animal feed, is high in bioavailability and can promote growth and development of animals, reduce the diarrhea rate and improve the health level of the animals.

This application provides a method for preparing nano-sized orthogonal iron phosphate and a method for preparing lithium iron phosphate cathode materials, relating to the field of electrode materials. The method for preparing nano-sized orthogonal iron phosphate includes: mixing a first ferrous salt solution with a first phosphorus source solution and an oxidant to perform a co-precipitation reaction to obtain amorphous iron phosphate; mixing the amorphous iron phosphate with water to form a slurry, controlling the slurry particle size, and then adding a crystal transformation aid to the slurry, followed by aging under stirring conditions at a pH of 0.8–1.5 to obtain nano-sized orthogonal iron phosphate; wherein the crystal transformation aid includes a second ferrous salt and a second phosphorus source. The iron phosphate prepared in this application is single-crystal nano-sized orthogonal iron phosphate, reducing the grinding pressure at the lithium iron phosphate end. Simultaneously, its unique octahedral structure is more stable than monoclinic iron phosphate produced by conventional processes, with fewer crystal defects and higher lattice integrity, effectively avoiding the generation of magnetic foreign matter during sintering and contributing to the performance of lithium iron phosphate materials.

The application provides a low-cost lithium iron phosphate and a preparation method and application thereof, and belongs to the field of lithium battery materials, wherein an intermediate is obtained by mixing a ferrous salt solution with a lithium source, a phosphorus source, a reducing agent and a homogeneous precipitant; the intermediate is mixed with a carbon source to obtain a mixed slurry; and the mixed slurry is subjected to spray drying, calcination and crushing treatment to obtain lithium iron phosphate. The intermediate is prepared by directly reacting the ferrous salt solution with the lithium source, the phosphorus source, the reducing agent and the homogeneous precipitant, the synthesis of an expensive iron source precursor and the complicated nanometer grinding process in the traditional process are omitted, the process flow is greatly shortened, and the raw material cost and energy consumption are significantly reduced; in combination with the spray drying and calcination process, the introduction of impurities is effectively avoided, the prepared lithium iron phosphate has the characteristics of low cost, good consistency and excellent electrochemical performance, and effectively promotes the cost reduction and efficiency increase of new energy automobile power batteries.

The invention relates to an adsorption material and a preparation method and application thereof, and relates to the technical field of adsorption materials, the preparation method comprises the following steps: taking a charcoal raw material, ferrite and ferric salt as raw materials, heating and stirring under an alkaline condition, and then carrying out pyrolysis treatment to obtain a magnetic charcoal material; and performing swelling treatment on the magnetic biochar material by using a CO2 supercritical fluid carrying imidazolium ionic liquid containing a sulfonic acid group to obtain a first magnetic biochar material and the like. On the basis of the prior art, a magnetic biochar material is subjected to combined and cooperative treatment mainly by adopting a CO2 supercritical fluid carrying acidic ionic liquid swelling treatment process and a corona discharge treatment process in a hydrogen peroxide-containing atmosphere in sequence; the removal efficiency of the obtained adsorption material on suspended solids and organic pollutants under the room temperature condition and the recycling stability are remarkably improved, so that the requirement of multiple times of recycling under the scenes of high suspended solids and high grease content such as cosmetic wastewater treatment can be met.

The application provides a kind of alkali leaching recovery method of waste oxide battery positive material, comprising: with the mixed aqueous solution of glycine, alkali and oxalate as the alkali leaching bottom solution, adding waste oxide battery positive material, soluble ferrous salt into the alkali leaching bottom solution, and carrying out leaching reaction. The method can realize the reduction of high-valence metal in oxide waste lithium ion battery positive material by using the reducing property of ferrous ion, can effectively improve the leaching efficiency of valuable metal, shorten the time of alkali leaching, and obtain higher metal leaching rate. And the leaching method can effectively avoid the entry of iron ion into liquid phase in the leaching process, causing a series of problems such as difficult separation of valuable metal in subsequent process, the reagent used is simple, the method condition is simple and easy to control, the energy consumption is low, the efficiency is high, and it has considerable industrial application prospect.

This invention relates to an iron-polyphenol-coated composite aerogel, its preparation method, and its application, belonging to the field of adsorbent preparation and application technology. The invention involves first immersing a porous aerogel in a polyphenol aqueous solution, then adding ferrous salt to the solution for liquid-phase deposition, washing with ultrapure water, crosslinking with glutaraldehyde aqueous solution, thoroughly washing with ethanol and ultrapure water, and finally drying to obtain an iron-polyphenol-coated composite aerogel. The raw materials used in this method are green and safe, the preparation process is simple, and it can be produced on a large scale. The resulting iron-polyphenol-coated composite aerogel exhibits high adsorption capacity, high selectivity, and high reduction rate for gold ions in aqueous solution, and also possesses excellent adsorption-desorption cycle stability, making it suitable for the efficient separation and recovery of gold from electronic wastewater.

The application discloses a treatment method of ferric phosphate wastewater, comprising the following steps: S1. adding a certain amount of water-soluble ferrous salt and an oxidizing agent into the ferric phosphate wastewater, so that the molar ratio of phosphorus to iron in the wastewater is 1:(1-5); S2. neutralizing by adding alkali, and adjusting the pH to 2.5-3.5; S3. performing solid-liquid separation to obtain a filter cake and a filtrate; S4. firstly performing ceramic membrane separation on the filtrate, then performing nanofiltration membrane treatment on the ceramic membrane clear liquid, and then performing reverse osmosis membrane treatment on the nanofiltration membrane clear liquid to obtain a reverse osmosis clear liquid and a reverse osmosis concentrated liquid; and S5. mixing the nanofiltration membrane concentrated liquid and the reverse osmosis concentrated liquid, and then performing treatment by using an MVR system to obtain an MVR evaporation liquid and a sulfate crystal product. The application is not introduced with calcium ions, and is treated by using a one-step precipitation method under a low pH condition, and is comprehensively treated by using a ceramic membrane + nanofiltration membrane + reverse osmosis membrane, so that the purpose of zero discharge of the ferric phosphate wastewater is achieved.

This invention discloses a method for preparing and applying nanocluster magnetic beads, comprising the following steps: adding a salt solution containing ferrous and ferric salts to an aqueous solution, dissolving it uniformly, then adding a dispersant to obtain a mixed solution, stirring evenly, and heating; adding ammonia water to the heated mixed solution, stirring the reaction to obtain nanocluster magnetic beads. This invention directly synthesizes nanocluster magnetic beads using an innovative one-step method, eliminating the need for multi-step synthesis and subsequent separation steps, and the synthesized nanocluster magnetic beads can be used for cell separation and MRI imaging.

The invention relates to the field of lithium ion battery positive electrode materials, and particularly discloses a preparation method and application of a co-doped ferrous phosphate precursor material.The preparation method comprises the steps that an antioxidant solution and a salt solution containing doped metal ions are added into a ferrite solution, and an iron source mixed solution is obtained; mixing and reacting a phosphorus source, an iron source and an alkaline solution to obtain blue ferrous phosphate slurry; and then filtering, washing, drying and crushing to obtain the doped ferrous phosphate precursor material. According to the invention, doping and morphology regulation and control are integrated in a single reaction system through a metal ion doping process, so that the preparation process is greatly simplified, and the compaction density and the rate capability of the prepared lithium iron phosphate positive electrode material are remarkably improved.

The present application relates to the technical field of sludge treatment, and particularly relates to a preparation method and application of an iron-based dewatering conditioning agent, comprising: mixing inorganic sludge after drying with steel slag, adding ferrous salt and acid solution for stirring reaction, then performing solid-liquid separation to obtain precipitate A and acid leaching solution B; performing washing, drying, grinding and calcination on the precipitate A to obtain carbonized carrier C; mixing the acid leaching solution B with the carbonized carrier C for reaction, and performing solid-liquid separation, washing and drying to obtain the iron-based dewatering conditioning agent. The present application utilizes municipal multi-source solid waste to prepare porous medium carrier, and performs multi-phase nano-scale metal oxide particle modification on the surface, simultaneously utilizes the high specific surface area of the material and the multi-reaction active sites provided by the surface metal oxide particles, can effectively strengthen the advanced oxidation reaction efficiency, realizes efficient decomposition of organic matter in high-organic-matter sludge, and realizes the improvement of the dewatering performance of the high-organic-matter sludge.

This invention relates to the field of polymer carrier modification technology, and more particularly to a method for preparing modified polyurethane filler. The invention involves mixing a peroxide solution and a ferrous salt solution, adjusting the pH to obtain a mixed solution, and then immersing the polyurethane filler in the mixed solution for modification, ultimately obtaining the modified polyurethane filler. The novel polyurethane filler obtained by the modification method described in this invention exhibits significantly improved biocompatibility and a larger specific surface area compared to traditional polyurethane fillers. This promotes the adsorption and growth of microorganisms on the filler surface, forming a biofilm, and thus improves its efficiency in wastewater treatment using biofilm methods.

The application relates to the technical field of batteries, in particular to a preparation method of a lithium iron phosphate positive electrode material. The preparation method of the lithium iron phosphate positive electrode material provided by the application comprises the following steps: sequentially subjecting a mixed solution containing chelates of ferrous salt, phosphate and soluble lithium salt to first drying and first sintering to obtain first sintered materials; and sequentially subjecting the first sintered materials and a carbon source to grinding, second drying, second sintering and crushing to obtain the lithium iron phosphate positive electrode material. The preparation method of the lithium iron phosphate positive electrode material is simple in steps, low in sewage yield and low in production cost, and improves the comprehensive performance such as the electrochemical performance and the compaction density of the lithium iron phosphate positive electrode material.

The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a method for treating battery recovery wastewater by irradiation, which comprises the following steps: (1) adjusting the pH value of lithium battery recovery wastewater to 2.5-4.0, adding a catalyst containing soluble ferrite, and mixing; (2) carrying out electron beam irradiation on the lithium battery recovery wastewater added with the catalyst; and (3) adjusting the pH value of the irradiated lithium battery recovery wastewater to 7.5-9.5, standing and precipitating, and taking the supernatant to obtain the treated wastewater.