224 results about "FERRIC IRON" patented technology

The invention discloses a method for separating and recycling phosphorus, iron and lithium in battery black powder, and relates to the technical field of battery recycling. The method comprises the following steps: carrying out acid leaching on battery black powder to obtain a battery black powder leaching solution and filter residues; an oxidizing agent is added into the battery black powder leaching solution, the pH of the solution is adjusted to 1.8-2.5, solid-liquid separation is conducted after the reaction is completed, and iron phosphate sediment and a lithium-containing solution are obtained; adjusting the pH value of the lithium-containing solution to 10-12, and carrying out solid-liquid separation after the reaction is completed to obtain a metal precipitate and a lithium sulfate solution; dissolving the iron phosphate precipitate in a sulfuric acid solution, adding a reducing agent to reduce ferric iron into ferrous iron, separating out ferrous sulfate by adopting an alcohol precipitation method or an ammonium sulfate crystallization method, and performing solid-liquid separation after the reaction is completed to obtain ferrous sulfate precipitate or ammonium ferrous sulfate crystals and mother liquor; and evaporating and concentrating the mother liquor, and extracting to obtain a phosphoric acid solution. According to the method, the three elements of phosphorus, iron and lithium in the battery black powder can be recycled, and the environmental problem caused by stacking of the lithium extraction slag can be avoided.

The invention relates to the technical field of preparation of battery materials, and discloses a method for synthesizing iron phosphate through continuous oxidation, which comprises the following steps: oxidation: oxidizing a ferrous solution by adopting oxygen-containing gas to obtain a ferric iron solution; synthesizing iron phosphate: reacting the ferric iron solution with a phosphorus source to obtain amorphous iron phosphate; and crystal transformation and roasting: carrying out crystal transformation and roasting on the amorphous iron phosphate to obtain the iron phosphate. The iron phosphate material prepared by the invention is oxidized by adopting the oxygen-containing gas, so that compared with hydrogen peroxide adopted in the prior art, the cost is lower, and the specific surface area and the tap density of the prepared iron phosphate material are higher.

This invention discloses a ternary composite adsorbent based on iron-catechol-boric acid, its preparation method, and its application, belonging to the field of dyeing and printing wastewater treatment. The adsorbent of this invention uses tannic acid with a surface rich in catechol groups as a substrate. A stable metal-phenolic network is formed through the coordination of trivalent iron with catechol groups, efficiently capturing anions using metal bridging and electrostatic attraction to form the adsorption core. Boric acid groups are further introduced as specific recognition units, forming specific dynamic covalent bonds with the catechol groups of anionic dyes. Compared with traditional adsorbents, the adsorbent of this invention provides ultra-high adsorption capacity and selectivity through the synergistic effect of multiple mechanisms, including electrostatic adsorption, coordination complexation, hydrogen bonding, and reversible covalent bonding of borate ester bonds. It can achieve efficient desorption of dyes and recycling of materials, and efficiently and rapidly remove anionic dyes from water.

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.

The invention relates to the field of glass detection, and particularly discloses a method for testing the content ratio of ferrous iron to ferric iron in glass. The method specifically comprises the following steps: washing a to-be-detected glass sample, grinding into micro powder, drying, respectively taking the same amount of glass micro powder, and marking as a sample 1 and a sample 2; divalent iron can be converted into ferric iron by adding perchloric acid into the sample 1, and the test result is the content of total iron in the glass. And dimethyl silicone oil is added into the sample 2 so as to isolate air and prevent ferrous iron from being oxidized into ferric iron in the testing process to influence the experiment result. According to the method, the proportion of Fe < 2 + > to Fe < 3 + > in an unknown glass sample can be simply and quickly obtained, the result is accurate and reliable, the test period is short, and the working efficiency is greatly improved.

The application discloses a method for removing organic pollutants by using molybdenum dioxide to promote activated periodate, and comprises the following steps: adding molybdenum dioxide, ferric salt and periodate into wastewater containing organic pollutants, and then performing catalytic degradation reaction to remove the organic pollutants in the wastewater. In the method, molybdenum dioxide is introduced into the homogeneous ferric / periodate system, and serves as an electron donor and mediator of a Fenton-like reaction. The molybdenum dioxide can not only accelerate the Fe 3+ / Fe 2+ cycle rate and promote the activation of the periodate, but also promote the generation of high-valence iron (Fe(IV)) in the system, form a non-radical pathway dominated oxidation mechanism, promote the degradation reaction to be more rapid and intense, and finally realize the efficient degradation of the organic pollutants. The method has the advantages of rapid degradation rate, good reusability, simple process, convenient operation and environmental friendliness, and can be widely used in the treatment of organic pollutant wastewater.

The application discloses a kind of with waste to treat iron-containing waste slag and battery-grade iron phosphate.The method comprises the following steps: S1, iron-containing waste slag is treated by acid leaching, and solid-liquid separation is carried out after acid leaching to obtain a first filtrate;S2, reducing waste slag is added to the first filtrate, and the ferric iron in the first filtrate is reduced to ferrous iron;S3, the pH of the first filtrate is adjusted and controlled to 1.5-3, and then solid-liquid separation is carried out to obtain a second filtrate, phosphoric acid is added to the second filtrate to obtain a mixed solution;S4, an oxidizing agent is added to the mixed solution, and solid-liquid separation is carried out after reaction to obtain a solid, which is washed and dried to obtain iron phosphate.The method for treating iron-containing waste slag in the application can treat at least two types of waste slag simultaneously using the waste-to-waste technology, which not only reduces the treatment cost of waste slag, but also converts waste slag into high-value battery-grade iron phosphate product, greatly reducing the preparation cost of battery-grade iron phosphate.

The invention discloses a copper oxide tailing treatment method based on a ferric iron-sulfuric acid leaching system, which comprises the following steps: S1, pretreatment: copper oxide tailing ore pulp is fed into a two-section closed circuit ore grinding system, and the ore pulp after ore grinding is preheated to complete low-temperature activation before entering a leaching reactor; s2, low-temperature-gradient-dynamic leaching is conducted, specifically, the preheated ore pulp is pumped into a leaching reactor, and temperature control, Fe and acidity dynamic control and parameter regulation and control in the leaching process are conducted in the leaching process; and S3, solid-liquid separation is conducted, slurry obtained after leaching is completed is pumped into an automatic plate-and-frame filter press, obtained filter cakes are conveyed to a tailing pond, leachate is conveyed to an SX-EW workshop to be treated, and cathode copper is prepared. According to the method, copper oxide is fully leached, gangue acid consumption is reduced by 60-70%, and meanwhile waste heat in the reaction process, acid barren liquor obtained after leaching and waste water are effectively utilized.

The application belongs to the technical field of food quality monitoring, and particularly relates to a ferric magnetic solid-phase masking agent and a quantitative detection method for lead in vegetable products. The ferric magnetic solid-phase masking agent is prepared by the following method: S1, performing carboxylation on the terminal amino group of DFO to obtain DFO-COOH; S2, coating a SiO2 layer on the surface of Fe3O4 magnetic core to obtain Fe3O4@SiO2; S3, modifying the Fe3O4@SiO2 by amination to obtain Fe3O4@SiO2-NH2; and S4, coupling Ac-DFO with Fe3O4@SiO2-NH2 to obtain Fe3O4@SiO2-DFO. The three hydroxamic acid groups of DFO are combined with Fe 3+ to form a stable chelate, and Fe 3+ can be removed through magnetic separation, the removal rate is increased to more than 99%, and the quantitative detection of lead ions is further faster and more accurate in combination with mature immunochromatography technology.

The invention provides a method for removing ferrous iron in a nickel chloride solution through efficient oxidation promotion, belongs to the technical field of purification treatment of chlorination system solutions, and solves the problem that free ferrous iron in the nickel chloride solution cannot be effectively oxidized and converted into ferric iron in the prior art. Controlling the concentration of main metal nickel ions, and adding a corresponding amount of hydrogen peroxide into the nickel chloride solution for stirring according to the content of impurity Fe in the nickel chloride solution; injecting the stirred nickel chloride solution into an electrolytic bath, heating, and raising the temperature of the nickel chloride solution in the bath; and the cathode and the anode in the electrolytic bath are conducted, and the introduced nickel chloride solution is subjected to electrolytic treatment, so that divalent iron in the nickel chloride solution can be converted into trivalent iron. The process flow is simple, the production process is easy to control, the facility equipment investment is low, and the final benefit is remarkable.

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 invention relates to the technical field of battery electrodes, and discloses a negative electrode coating preparation method, a negative electrode plate and a battery. According to the negative electrode coating preparation method, a zinc-based composite negative electrode plate is coated with colloid formed by taking ferric iron complex salt as an effective component; a protective film can be formed on the surface of the zinc-based composite negative pole piece in the charging and discharging process of the battery, and the protective film prevents a negative active substance from being dissolved in an electrolyte, slows down the rapid attenuation of the discharge capacity of the battery, prevents the negative pole piece from being in direct contact with the electrolyte, reduces gas production of the battery, enables zinc to be uniformly deposited and prevents zinc dendrites from being formed, so that the service life of the battery is prolonged. And the charge-discharge efficiency of the battery is improved under the condition of prolonging the cycle life.

The invention particularly relates to a method for determining a reaction rate constant of tetravalent iron and organic pollutants by using a chemiluminescence method, and belongs to the technical field of water quality detection. According to the method, on the basis of a chemiluminescence reaction between Fe (IV) and naproxen (NAP), a target organic pollutant (TrOC) is introduced, the quenching effect of the target organic pollutant on a chemiluminescence signal is measured, and a competitive kinetic model between the chemiluminescence quenching capacity (CLQC) and a secondary reaction rate constant (kFe (IV), TrOC) of Fe (IV) on the target pollutant is constructed. According to the method, the concentration of Fe (IV) does not need to be monitored in real time, and the reaction activity between Fe (IV) and various pollutants can be directly and rapidly measured only by comparing the intensity change of the chemiluminescence signals when the target pollutants exist and do not exist.

The invention discloses a device and a method for strengthening the denitrification efficiency of Fammox based on an extracellular electron transfer regulation and control strategy. The device comprises a CSTR (continuous stirred tank reactor) main body, a water inlet and outlet system, a stirring and constant temperature device, an aeration and anaerobic maintenance device and an EET (ethylene terephthalate) enhanced feeding device, the temperature, the stirring speed and the inlet water iron ion concentration in the Fammox reactor are accurately regulated and controlled, and the L-cysteine and the corn straw biochar are added, so that the electron transfer efficiency and the iron matrix utilization rate in the reaction are effectively improved, and the nitrogen removal efficiency and the Fe (III) utilization and reduction rate are remarkably improved. The L-cysteine and the corn straw biochar adopted by the invention have relatively good economical efficiency and environmental protection property, the denitrification efficiency of Fammox can be remarkably improved, and the utilization and reduction capability of ferric iron (Fe (III)) is effectively enhanced.

The application discloses a Ce2S3@Fe composite material and a preparation method and application thereof, and belongs to the technical field of radioactive wastewater treatment, and the preparation of the Ce2S3@Fe composite material comprises the following steps: under the protection of inert gas, cerium sulfide is added into a ferric iron solution, and then a sodium borohydride solution is slowly added dropwise, so that the ferric iron is reduced to zero-valent iron by using the reducing property of the sodium borohydride solution and is uniformly loaded on the surface of the cerium sulfide, thereby forming the Ce2S3@Fe composite material; and the prepared Ce2S3@Fe composite material is applied to purification of uranium-containing wastewater. 2+ The application adopts the above Ce2S3@Fe composite material, the preparation method and the application thereof, and has the advantages of convenient operation, low cost, environmental friendliness, fast reduction rate, long UO2 stabilization time, all-weather operation, simultaneous consideration of radioactive wastewater treatment and uranium resource recovery.

This invention discloses a method for preparing battery-grade nickel sulfate and iron phosphate using nickel pig iron and ferric phosphate slag as raw materials. The preparation process involves first mixing the ferric phosphate slag with cationic alkyl polyacrylamide to form a uniform mixture. This mixture is then added to dilute acid and stirred to disperse it. Nickel pig iron powder is added, and the mixture is filtered to obtain a leaching solution. The leaching solution is then subjected to nickel-iron separation using resin to obtain an iron-containing solution and a nickel-containing resin. The nickel-containing resin is desorbed to obtain a desorbed solution. A nickel-based pH adjuster is added to this desorbed solution, and the solution is filtered to obtain a nickel sulfate solution. After evaporation and concentration to precipitate crystals, the solution is dried and crushed to obtain battery-grade nickel sulfate. Hydrogen peroxide is added to the iron-containing solution to oxidize ferrous iron to ferric iron. A phosphorus source is added, the pH is adjusted, and the solution is reacted, filtered, and dried to obtain iron phosphate dihydrate. This is then calcined to obtain battery-grade iron phosphate. This invention uses nickel pig iron and ferrophosphate slag as raw materials, and utilizes the ferrophosphate slag to promote the full leaching of iron from nickel pig iron, and nickel pig iron to promote the leaching of phosphate and iron from ferrophosphate. With the addition of cationic alkyl polyacrylamide, it achieves high leaching rates of iron and nickel in a short time, and simultaneously achieves the separation of non-ferrous and nickel metal ions during the acid leaching process, so as to finally obtain high-purity, qualified battery-grade nickel sulfate and ferrophosphate.

The invention discloses a ferric phosphate acid wastewater reverse osmosis membrane filtration method based on reducing agent treatment, which comprises the following steps: S1, pretreatment: respectively adding a reducing agent into ferric phosphate washing water and ferric phosphate filtrate to reduce ferric iron in the system into ferrous iron; s2, washing water membrane treatment: carrying out normal-pressure reverse osmosis treatment on the reduced iron phosphate washing water to obtain a first reverse osmosis concentrated solution and first reverse osmosis produced water; s3, filtrate membrane treatment: mixing the first reverse osmosis concentrated liquor and the reduced iron phosphate filtrate, and performing high-pressure reverse osmosis treatment to obtain second reverse osmosis concentrated liquor and second reverse osmosis produced water; and S4, phosphorus recovery: adding an oxidizing agent into the second reverse osmosis concentrated liquid, and adjusting the pH value to settle the iron phosphate. According to the method, ferric iron in the wastewater is reduced into ferrous iron with high solubility by adopting the reducing agent, so that the risk of membrane pollution is reduced, and then the wastewater is purified and recycled by combining a reverse osmosis technology.

The invention relates to the field of radar wave-absorbing materials, in particular to a magnetic carbon nanobelt wave-absorbing agent and a preparation method thereof. The magnetic carbon nanobelt wave-absorbing agent comprises nitrogen-doped carbon converted by polyimidazolium salt and magnetic nanoparticles carbonized and converted by ferric iron salt; the average particle size of the magnetic nanoparticles is 5nm-20nm, and the mass loading capacity of the magnetic nanoparticles is 20%-50%. The magnetic carbon nanobelt wave-absorbing agent provided by the embodiment of the invention can give consideration to dielectric loss and magnetic loss, and the wave-absorbing performance of the material is improved.

The invention relates to the field of lithium battery processing, and discloses high-compaction iron phosphate, a preparation method thereof and lithium iron phosphate. The preparation method comprises the following steps: 1) mixing and reacting a phosphoric acid-pyrophosphoric acid mixed solution with iron powder, and then mixing with a ferric iron source to obtain a solution containing ferric ions; wherein in the phosphoric acid-pyrophosphoric acid mixed solution, the concentration of phosphate radical is 7 to 12 mol / L, and the concentration of pyrophosphate radical is 0.01 to 0.1 mol / L; the molar ratio of the iron powder to the pyrophosphate radical is (2-8): 1; and 2) carrying out first filter pressing on the solution containing the ferric ions, reacting the obtained filtrate at 80-120 DEG C for 0.5-6 hours, then reacting at 30-60 DEG C for 0.5-2 hours, and sequentially carrying out second filter pressing, water washing, flash drying and sintering. The preparation method adopts an iron phosphate one-step synthesis route, and is short in flow and simple in process.

The preparation method comprises the following steps: preparing functionalized silicon dioxide nanospheres by a template method, grafting the functionalized silicon dioxide nanospheres to light and thin COF, carrying out a hydrothermal reaction on ferrous nitrate and the nanospheres to obtain hollow ferrous silicate (FeSiO3 (at) COF) nanospheres, and carrying out high-temperature crystallization to obtain the FeSiO3 (at) COF hollow composite nanospheres. And replacing ferrous iron with equimolar ferric iron to obtain the hollow ferrous silicate Fe2 (SiO3) 3 (at) COF composite nanosphere. A composite structure of a sample is characterized by means of a scanning electron microscope (SEM), a transmission electron microscope (TEM), nitrogen adsorption-desorption (BET) and the like, electromagnetic parameters of Fe2 (SiO3) 3 (at) COF and FeSiO3 (at) COF coaxial ring samples are tested, and experimental results show that the highest dielectric constant value of the FeSiO3 (at) COF coaxial ring samples is 2.78, and the highest dielectric loss value of the FeSiO3 (at) COF coaxial ring samples is 0.15.

The present invention relates to a method for regenerating positive electrode active material and a positive electrode active material regenerated therefrom. More specifically, it provides a method for regenerating positive electrode active material and a positive electrode active material regenerated therefrom, in which, during the regeneration process, trivalent iron is synthesized in a single crystal structure and trivalent iron is converted to divalent iron, so that no trivalent iron remains inside the regenerated positive electrode active material. This prevents a decrease in battery performance, provides excellent lifespan characteristics in high-voltage environments, has high thermal stability, and generates little gas during charging and discharging.

This invention discloses a method for enhancing the degradation of adsorbed phenanthrene on biochar by sphingosine-containing bacteria. The method includes the following steps: 1) mixing sphingosine-containing bacteria solution with phenanthrene-adsorbed biochar in a culture medium solution; 2) adding an exogenous iron chelating agent and a ferric salt solution to the mixture, and then incubating under natural conditions to degrade and remove the phenanthrene adsorbed on the biochar. This invention uses an exogenous iron chelating agent and ferric salt to enhance the degradation efficiency of microorganisms on adsorbed phenanthrene on biochar, strengthens the regeneration of biochar adsorption performance through microbial degradation, improves the long-term effectiveness of biochar in soil pollution fixation and control, reduces the risk of secondary pollution, and provides technical support for improving soil environmental quality. It has good economic and environmental benefits in practical applications.

This invention provides a method for preparing titanium dioxide by hydrolysis of titanium-containing waste residue, comprising the following steps: a hydrolysis step: mixing titanium-containing waste residue with water to hydrolyze titanium tetrachloride in the waste residue; a reduction step: adding a reducing agent to the hydrolyzed solution to reduce ferric iron in the solution to ferrous iron; a pH adjustment step: adjusting the pH value of the solution to obtain crude titanium dioxide precipitate; and a washing step: washing the crude titanium dioxide to produce the titanium dioxide product. This invention achieves the resource utilization of titanium in titanium-containing waste residue, with fewer production steps, and effectively improves the purity of titanium dioxide through reduction and washing processes.

The invention provides a system and a method for coupling biogas desulfurization with denitrification nitrogen removal. The system comprises a sulfur-containing biogas conveying unit, a wet desulfurization unit, an alkali liquor adding device, a first purified biogas conveying device, a dry desulfurization unit, a nitrate nitrogen wastewater conveying unit, a sulfur autotrophic nitrogen removal unit, a wet by-product conveying unit, a dry by-product conveying unit and a desulfurizing agent regeneration unit. According to the system, wet-process byproducts and dry-process byproducts are directly used for sulfur autotrophic nitrogen removal, an outsourcing sulfur source is replaced, the sulfide treatment cost is reduced, and meanwhile, alkalinity addition is reduced by utilizing alkalinity of the byproducts. The Fe-containing by-product after denitrification is subjected to chemical oxidation regeneration to regenerate the ferric iron-based desulfurizing agent, the ferric iron-based desulfurizing agent is reused for dry desulfurization, closed-loop circulation of iron elements is formed, the treatment cost of a sulfur source, alkalinity, a carbon source and the by-product is saved, and the method is suitable for cooperative treatment of biogas and tail water of a sewage treatment plant.

The application provides a recovery method and a recovery device, the recovery method comprising the following steps: performing chlorine ion electrolytic oxidation treatment on a phosphorus-iron system to obtain a dechlorinated phosphorus-iron residue system; performing trivalent iron electrolytic reduction treatment on the dechlorinated phosphorus-iron residue system to obtain a reduction system; performing impurity removal treatment on the reduction system to obtain a divalent iron system; and performing divalent iron electrolytic oxidation treatment on the divalent iron system to obtain a trivalent iron system. The recovery method provided by the application takes the phosphorus-iron system as a recovery object, realizes the separation of trivalent iron and impurity elements to the greatest extent, has low recovery cost, and is helpful to the popularization and application in the industrial field.

The invention provides a method for extracting an iron phosphate precursor from waste lithium iron phosphate battery black powder, which comprises the following steps: S1, carrying out flotation on directly crushed waste lithium iron phosphate batteries to obtain primarily screened black powder; s2, mixing the black powder with a ferric iron salt solution, and reacting at 30-60 DEG C for 1-5 hours; s3, carrying out solid-liquid separation on the reacted material to obtain a lithium-containing leachate and iron phosphate filter residues; and S4, the lithium-containing leachate is subjected to oxidation treatment, Fe < 2 + > in the solution is oxidized into Fe < 3 + >, and a reusable ferric salt solution is obtained. According to the invention, a chemical oxidation method is adopted to realize one-step removal of aluminum and copper impurities in black powder and conversion of lithium iron phosphate to a precursor iron phosphate.

The invention discloses a fluorescent probe based on an ESIPT principle and application of the fluorescent probe in detection of total iron, ferrous iron and ferric iron. The probe OHNH contains a phenolic hydroxyl group, generates strong fluorescence through ESIPT, and has the advantages of good light stability, high fluorescence quantum yield, good water solubility, difficult hydrolysis, simple synthesis and the like. Fe and OHNH can generate specific complexation, the ESIPT process is influenced, and fluorescence quenching is caused. Fe is easily oxidized into Fe under the heating condition of a drying oven, and then fluorescence quenching is also triggered. Based on the principle, high-selectivity and high-sensitivity detection of total iron, ferrous iron and ferric iron can be realized. The method is low in cost, easy and convenient to operate, high in specificity and high in accuracy, and visual detection can be achieved. Furthermore, the method can be used for valence state distinguishing and content determination of iron in complex matrixes such as medicines, foods and water bodies, and has important practical application value.

The present application relates to municipal engineering pipe network maintenance technical field, specifically to a kind of composite reagent for removing hydrogen sulfide in pipe network and its preparation method and application.The present application provides a kind of composite reagent for removing hydrogen sulfide in pipe network, by weight parts, including 90-95 parts of ferric salt, 3-7 parts of dispersing agent, 2-3 parts of 2-amino benzothiazole.Three components form "dispersion-adsorption-synergistic" integrated mechanism: dispersing agent guarantees that reagent is fully contacted with hydrogen sulfide, ferric salt provides precipitation reaction basis, synergist further strengthens adsorption and reaction kinetics, improves the removal rate of hydrogen sulfide with the advantages of low cost, no secondary pollution, realizes efficient, economic, environmental hydrogen sulfide management.

The invention discloses a method for synergistically extracting nickel and cobalt and separating the nickel and the cobalt from scandium and manganese, and belongs to the technical field of nickel and cobalt extraction. The method comprises the following steps: adding a sulfuric acid solution into a nickel-cobalt-containing material for leaching, and carrying out solid-liquid separation to obtain a first leachate; a first oxidizing agent is introduced into the first leachate for first oxidation, ferrous iron is oxidized into ferric iron, and first oxidized leachate is obtained; carrying out vanadium precipitation and iron removal on the first oxidized leachate, and carrying out solid-liquid separation to obtain scandium-containing ferrovanadium slag and a second leachate; a second oxidizing agent is added into the second leaching solution for second oxidation, so that divalent manganese is oxidized into tetravalent manganese, and manganese oxide precipitation slag and a third leaching solution after manganese removal are obtained through solid-liquid separation; and performing nickel-cobalt extraction on the third leaching solution by adopting a synergistic extraction agent, and extracting nickel and cobalt into an organic phase. By adopting the method, the separation of nickel and cobalt from scandium and manganese can be realized, the extraction can be performed under the condition of lower pH, and the nickel and cobalt extraction efficiency is improved.

The application provides a preparation method of a sodium ferrous disulfide catalyst and application of the sodium ferrous disulfide catalyst in direct coal liquefaction, and relates to the technical field of coal liquefaction.The preparation method of the sodium ferrous disulfide catalyst comprises the following steps: mixing a ferric salt solution and a Na2S solution or a NaHS solution, performing a precipitation reaction, and obtaining a precipitation reaction system; and aging the precipitation reaction system, and performing solid-liquid separation to obtain the sodium ferrous disulfide catalyst.The preparation method of the NaFeS2 catalyst is simple in process, mild in preparation condition, does not need heating and pressurization, has a wide source of raw materials, is low in cost, and is easy to be industrialized.The obtained sodium ferrous disulfide has high catalytic activity as a catalyst for direct coal liquefaction, and the oil yield and conversion rate of direct coal liquefaction are higher than those of a catalyst used in the industry at present.