64629 results about "Chemical engineering" patented technology

The invention discloses a method for continuously and efficiently adsorbing and separating hydrogen isotopes. The hydrogen isotopes are separated by adopting a multi-tower variable-temperature variable-pressure device operated in a simulated moving bed operation mode. When the device runs, each adsorption tower needs to sequentially execute the following steps: 1, adsorption; 2, replacement; 3, heating; 4, vacuumizing and desorbing; 5, carrying out vacuum purging; 6, pressurizing and cooling; the operation mode of the simulated moving bed is that an adsorption tower is frequently, sequentially and synchronously moved along the gas flowing direction in the tower through all gas input and output ports, so that an adsorbent phase and a gas flowing phase in the tower form countercurrent flow, and the hydrogen isotope adsorption separation efficiency is enhanced. The invention relates to a technological process of cyclic adsorption, replacement, heating, vacuum desorption, pressurization and cooling, continuous and efficient hydrogen and isotope adsorption separation is realized, multi-tower serial adsorption and replacement are adopted in the process, and separation of hydrogen isotopes (such as H2 / D2) is enhanced; and the desorption efficiency of heavy components is improved by adopting a heating and vacuumizing depressurization coupling mode.

A long-term fire retarding biochemical liquid composition including: a dispersing agent realized in the form of a major amount of water, for dispersing alkali metal ions dissolved in the water; a major amount of a first fire retarding agent realized in the form of a primary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, tripotassium citrate, for providing metal potassium ions dispersed in the water when the at least one alkali metal salt is dissolved in the water to form a mixed retardant solution; a minor amount of a second fire retarding agent realized in the form of a secondary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, potassium, sodium, calcium and / or magnesium benzoate, for providing benzoate ions dispersed in the water when the secondary alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent.

The invention discloses an asphalt-based hard carbon material as well as a pre-oxidation preparation method and application thereof. Belongs to the technical field of asphalt-based hard carbon materials. The pre-oxidation preparation method comprises the following steps: carrying out primary pre-oxidation treatment on asphalt at 250-400 DEG C in air flow of 50-500mL / min; crushing the obtained primary pre-oxidized asphalt, and then carrying out secondary pre-oxidation treatment at 250-400 DEG C in air flow of 50-500mL / min to obtain secondary pre-oxidized asphalt; and carrying out carbonization treatment on the secondary pre-oxidized asphalt. According to the method, the asphalt can be kept in a solid-phase state to be subjected to efficient and thorough oxidation cross-linking reaction, the production cost is reduced, the obtained asphalt-based hard carbon material has high first coulombic efficiency and high capacity, and powerful support is provided for commercial application of sodium-ion battery negative electrode materials and rapid development of an energy storage technology.

A direct air capture (DAC) of CO2 system includes a reaction reactor having a solid, amine-functionalized sorbent configured to sequester CO2 from air; an in-situ dual-function device configured as a CO2 conversion reactor and an exchange fluid regeneration device; and the exchange fluid, recirculating between the reaction reactor and the dual-function device, configured to capture the sequestered CO2 from the solid sorbent in the reaction reactor and release the captured CO2 in the conversion reactor, the exchange fluid including one or more amino acids.

The invention relates to a stable silk fibroin liquid condensation body, gel and a preparation method and application thereof, and belongs to the technical field of silk fibroin. The preparation method comprises the following steps: S1, dissolving silk fibroin in a lithium bromide solution, and then adding trypsin for incubation to obtain an enzyme-digested silk fibroin solution; and S2, performing low-temperature programmed centrifugal treatment including an induction stage, a nucleation stage and a liquid-liquid phase separation stage on the enzyme-digested silk fibroin solution, and cleaning to obtain the stable silk fibroin liquid-state aggregate, the method can reduce aggregate liquid drop aggregation and improve the particle size uniformity of the liquid drops.

The invention belongs to the technical field of cell cryopreservation, and relates to a cryopreservation method based on ultrasonic ice planting. In the method, the nucleation temperature of ice planting is less than-9 DEG C, and the cooling rate from nucleation to icing is less than 5 DEG C / min. Compared with the prior art, the method has the advantages that the time required for cryopreservation of the cells is remarkably shortened, meanwhile, damage to the cells caused by ice crystals generated in the cooling process is reduced, and the problem that an existing cell cryopreservation cooling method cannot meet the nucleation and freezing uniformity of a cell solution in the cooling process is solved.

The invention provides a solid electrolyte slurry, an electrode slurry, a solid electrolyte sheet, an electrode sheet, a solid battery monomer, a battery device and a power utilization device.The solid electrolyte slurry comprises a sulfide solid electrolyte material, a solvent and a binder dissolved in the solvent, and the solvent is a non-polar solvent, a weak-polar solvent or a mixed solvent of the non-polar solvent and the weak-polar solvent; the binding agent comprises a polyacrylate binding agent and a non-polar polyolefin binding agent. The slurry disclosed by the invention has high dispersity, high suspension property and good cohesiveness, and can enable the solid-state battery monomer to have high initial coulombic efficiency when being used in the solid-state battery monomer.

The invention provides a biomass-derived spherical porous carbon material and a preparation method thereof, and a silicon-carbon negative electrode material and a preparation method thereof, and relates to the field of lithium ion batteries. The preparation method of the biomass-derived spherical porous carbon material comprises the following steps: carrying out pre-carbonization treatment on vinasse to obtain pre-carbonized vinasse, mixing the pre-carbonized vinasse with an acidic solution, and washing with water until the mixture is neutral to obtain pre-treated vinasse; mixing the pretreated vinasse with a pore-forming agent, a binder and water to prepare slurry, and performing spray drying on the slurry to obtain a spheroidized precursor; carrying out carbonization treatment on the spheroidized precursor; washing the carbonized spheroidized precursor with water until the spheroidized precursor is neutral, and drying the spheroidized precursor to obtain an intermediate; and activating the intermediate with water vapor to obtain the biomass-derived spherical porous carbon material. The material with a regular spherical and porous structure can be prepared, the material can be used for preparing a silicon-carbon negative electrode material with a stable structure, and the electrochemical performance of the silicon-carbon negative electrode material is improved.

The invention provides a method for recovering a BHET monomer from a waste polyester textile alcoholysis solution, and is characterized in that the recovery method comprises the following steps: (1) filtering: mixing the waste polyester textile alcoholysis solution with water under a stirring condition, and filtering at 55-70 DEG C; and (2) cooling crystallization: under a stirring condition, carrying out primary cooling on the filtrate obtained by filtering in the step (1) from 55-70 DEG C to 45-55 DEG C, then adding a BHET seed crystal, then carrying out secondary cooling to 5-15 DEG C, and maintaining the temperature for 20-60 min to obtain the BHET monomer. The mixed solution cooling crystallization method is developed on the basis of complexity of components of the waste polyester textile fabric, the problems that in the conventional production process, a BHET crystal product is low in quality, prone to scaling, difficult to filter and dry and the like are solved, and the obtained BHET product is large in particle size, narrow in particle size distribution, high in purity, good in fluidity and high in stability.

A device for extracting CO2 from air comprises at least one extraction reactor (12) through which CO2-containing air (L) flows in an adsorption operation, having an adsorption surface; a heating arrangement (40) for heating the at least one extraction reactor (12) at least in the region of its adsorption surface to a temperature above an extraction gas desorption temperature in a heating / desorption operation; and at least one extraction gas storage (48) for storing CO2 desorbed from the at least one extraction reactor (12) in the heating / desorption operation. The extraction reactor (12) comprises at least one substrate with a plurality of flowable cells or flow channels of a porous structure, wherein the adsorption surface is formed on the substrate, and wherein the at least one substrate is electrically conductive and can be heated by applying an electrical voltage.wherein the heating arrangement (40) comprises the at least one substrate and a voltage source (42) for applying an electrical voltage to the at least one substrate.

The invention discloses rapid denitrification composite carbon source particles as well as a preparation method and application thereof. The rapid denitrification composite carbon source particle is prepared from raw materials including a slow-release skeleton, a carbon source and an optional functional modified material. The invention integrates the advantages of two solid carbon sources (natural carbon source and artificially synthesized carbon source), and develops novel composite carbon source particles with excellent performance and high cost effectiveness by designing and regulating the formula, proportion and structure. The prepared rapid denitrification composite carbon source particles can ensure that microorganisms have stable carbon source supply in the whole denitrification process, and the denitrification efficiency reduction caused by discontinuous or non-uniform carbon source supply is avoided. The rapid denitrification composite carbon source particles prepared by the invention also have the characteristics of easy biofilm formation, easy fluidization, stable carbon release, lasting carbon supply, relatively high mechanical strength, low cost, wide application range, difficulty in breaking, long service cycle and large specific surface area, and can be well applied to a biological sewage treatment system as a microbial carrier.

The invention belongs to the technical field of artificial prosthesis materials, and particularly relates to a medical implant with a lithium disilicate coating and a preparation method thereof, and the preparation method comprises the following steps: (1) placing a prefabricated matrix in a high-temperature environment for staged sintering, and then carrying out surface polishing, cleaning and drying treatment; (2) mixing lithium ethoxide and tetraethoxysilane at room temperature, and reacting for 2-4 hours while stirring to obtain lithium disilicate sol; the preparation method comprises the following steps: preparing a prefabricated substrate, soaking the prefabricated substrate in lithium disilicate sol for 3-7 minutes, performing sol permeation for 3-10 minutes under the negative pressure of more than 30 mm Hg, adding an ethanol water solution to initiate gelation reaction, taking out the prefabricated substrate after the reaction is completed, drying and sintering to obtain the medical implant with the lithium disilicate coating. According to the method, the uniform and continuous lithium disilicate coating which is not easy to fall off can be formed on the surface of the prefabricated matrix of the implant, so that the surface performance of the implant is improved, and the osteogenesis promoting performance and the angiogenesis promoting performance of the implant are optimized.

The invention provides an electrochemical active oxygen supply device for a washing machine and a preparation method. The device comprises a shell, a single closed reaction chamber is formed in the shell, a bifunctional anode electrode and a bifunctional cathode electrode are integrated in the reaction chamber, and a compact and uniform reaction area is formed between the anode electrode and the cathode electrode. When water flows through the reaction area, hydrogen peroxide (H2O2) and / or hydroxyl radicals (OH) are / is electrochemically generated on the surface in situ by accurately adjusting the electrode potential of the difunctional anode, so that instant generation and instant utilization of active oxygen are realized. The active oxygen directly enters a washing system of the washing machine along with water flow, bacteria, viruses and fungi can be efficiently inactivated under the normal-temperature or low-temperature washing condition without additionally adding chemical disinfectants, organic stains and peculiar smell molecules are synchronously degraded, and green, efficient and intelligent healthy washing is achieved.

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention is suitable for the technical field of quartz sand purification, and particularly relates to a quartz sand purification acid liquor concentration automatic compensation control method which comprises the following steps: acquiring an acid liquor concentration parameter sequence; wherein the acid liquor concentration parameter sequence is used for indicating the change of the acid liquor concentration from the beginning of purification to the preset purification time, and the acid liquor concentration reflected by the acid liquor concentration parameter sequence is located in an effective concentration interval; performing segmentation processing based on the acid liquor concentration parameter sequence to obtain sub-parameter segments; determining a compensation opportunity based on the sub-parameter segments; wherein the compensation opportunity is used for indicating the opportunity of adding the acid liquor next time; extracting consumption characteristics of each sub-parameter section; obtaining an initial compensation amount based on the plurality of consumption features; an actual compensation amount is determined based on the initial compensation amount and the compensation opportunity. According to the method, the compensation opportunity and the compensation amount can be sectionally determined based on the acid liquor concentration change rule, so that the purification effect of the quartz sand is improved.

Provided are a composite carbon source particle for rapid denitrification, and a preparation method therefor and the use thereof. The composite carbon source particle for rapid denitrification is prepared from raw materials including a sustained-release framework, a carbon source and an optional functionalized modification material. The composite carbon source particle for rapid denitrification can ensure the stable supply of a carbon source to microorganisms during the whole denitrification process, prevents a reduction in denitrification efficiency caused by discontinuous or non-uniform supply of a carbon source, has the characteristics of easily forming a biofilm, good fluidizability, stable carbon release, long-lasting carbon supply, relatively high mechanical strength, low cost, a wide application range, low risk of fragmentation, a long service cycle and a large specific surface area, and can be applied as a microbial carrier to a biological sewage treatment system.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using a waste vanadium-titanium catalyst and electroplating sludge, which realizes the mutual reaction of metal components in the electroplating sludge and components in the waste vanadium-titanium catalyst through the synergistic effect of various physical and chemical treatment methods and additives in the whole preparation process. The complex multi-metal catalyst can be used for photo-catalytic oxidation of carbon monoxide, has a remarkable oxidation effect and has a good application prospect.

The invention discloses water-based anti-forgery ink, a preparation method thereof, an obtained printed matter and application thereof, and relates to the technical field of printing forgery prevention. The water-based anti-forgery ink comprises the following components in percentage by mass: 15%-30% of water-based resin, 5%-20% of acrylic resin, 0.5%-10% of an auxiliary agent, 2%-5% of a first fluorescent developing substance, 3%-10% of a first microcapsule and the balance of water, a capsule core of the first microcapsule contains a second fluorescent color developing substance, a capsule shell is made of a first temperature-sensitive high polymer material, and the first temperature-sensitive high polymer material is subjected to reversible phase transformation at a first threshold temperature T1; the second fluorescent color-developing substance is different from the first fluorescent color-developing substance. According to the invention, multiple hidden anti-counterfeiting mechanisms are arranged and can be triggered under specific conditions, so that the cracking difficulty is increased; and the anti-counterfeiting verification requirements in some important occasions can be met.

The invention relates to a preparation method and application of a porous material for preparing methanol through carbon dioxide adsorption and conversion. When the material is prepared, firstly, 4, 4 '4' '-(1, 3, 5-triazine-2, 4, 6-trimethylene) triphenylamine and 1, 2-acenaphthequinone are treated in a mixed solvent containing dioxane / acetonitrile / 6M acetic acid, and AT-COF is obtained; further synthesizing by adopting an impregnation method to obtain IrRu-COF; and finally, uniformly mixing the active gamma-aluminum oxide and the IrRu-COF material to form a carrier dispersion liquid, and then carrying out PEI loading, vacuum impregnation, washing and drying to obtain the PEI functionalized gamma-Al2O3 / COF composite catalyst. The technical closed loop from low-concentration CO2 capture to solar driven conversion is realized, the process flow is simple, and the energy consumption is low.

The invention relates to the field of battery fire extinguishing agents, in particular to a hydrogel fire extinguishing agent for battery fire and a preparation method of the hydrogel fire extinguishing agent. The hydrogel fire extinguishing agent for the battery fire disasters has viscosity variability, the components of the fire extinguishing agent are screened and compounded, the thermal reversible gel and the thermal irreversible gel are added, and the slow carbon forming gel and the water-retaining agent glycerinum are further added; the hydrogel fire extinguishing agent is in a flowing state with high viscosity and high flowability at normal temperature, and the inactivator is quickly converted into a gel state with high adhesion and non-flowability when encountering high temperature, so that the use of the hydrogel fire extinguishing agent is facilitated; and the hydrogel fire extinguishing agent can be ensured to cover the battery in fire for a long time to prevent the battery from reburning.

The invention relates to a Fenton-like functional filler which is prepared from 10-20% of iron particles coated with a carbonized film, 10-20% of aluminum sulfate modified straw, 20-30% of PBAT-coated calcium peroxide, 20-30% of diatomite and 10-30% of an adhesive. A processing method of a Fenton-like functional filler comprises the following steps: uniformly mixing iron particles coated with a carbonized film, aluminum sulfate modified straws, PBAT-coated calcium peroxide and diatomite, then adding an adhesive, mixing isocyanate serving as the adhesive with polyol according to a volume ratio of 1: 5, and continuously and uniformly mixing; then the mixed raw materials are injected into a mold coated with a release agent in advance, the mold temperature ranges from 40 DEG C to 60 DEG C, the foaming curing time ranges from 15 min to 20 min, and the Fenton-like functional filler can be obtained. The invention relates to an application of a Fenton-like functional filler in constructed wetlands. The method has the beneficial effects that the method is not influenced by temperature, and the removal effect of the constructed wetland on nitrate nitrogen and refractory COD (Chemical Oxygen Demand) can be obviously enhanced.

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

The invention relates to the technical field of chemical engineering, in particular to a method and a device for removing heavy components from cyclohexanol. Comprising the following steps: a, rectifying a cyclohexanol-containing material from a cyclohexene hydration reaction to obtain a first solution containing cyclohexanol and heavy components in a tower kettle; b, carrying out heavy component removal operation on the first solution to obtain a third solution containing a catalyst and heavy components, a first gas phase and a second gas phase; and c, rectifying the first gas phase and the second gas phase to obtain a fourth solution subjected to heavy component removal, namely cyclohexanol subjected to heavy component removal. The entrained catalyst and heavy components are removed together, and the fluidity required by the catalyst waste liquid is maintained by using the heavy components, so that the loss of cyclohexanol is reduced.

A method comprises planarizing a substrate material with a functionalized chemical planarization pad. The functionalized chemical planarization pad includes a plurality of functional groups bonded to a material of the pad. The functional groups are configured to chemically react with the substrate material such that a portion of substrate material bonds to the functional groups. The pad is regenerated by applying a regeneration solution configured to break bonds between the functional groups and substrate material bonded to the functional groups to form removed material. The removed material is complexed in a dissolved complexing agent to form dissolved material in an effluent phase.

The invention discloses a solid waste-based zinc chloride preparation process control method and system, and relates to the technical field of zinc chloride preparation, and the method comprises the following steps: obtaining a unified time base line, establishing a bubble phase reference field, collecting a sound-induced echo sequence, a micro-pressure waveform sequence and a light scattering sequence of a reaction liquid under the bubble phase reference field, and calculating the solid waste-based zinc chloride preparation process. Fusing to generate a bubble density space-time matrix; and performing reversible time-frequency rearrangement based on the bubble density space-time matrix, decomposing to obtain different frequency band distributions, extracting a narrow-band resident bubble group, calculating critical volume distribution and collapse precursor indexes, and constructing a dynamic risk fingerprint database. According to the method, a unified time base line and a bubble phase reference field are constructed, the bubble state is perceived in real time, collapse forebodes are recognized, a dynamic risk fingerprint database is established, directional intervention and reverse energy channel collapse nucleus extinguishing are achieved in combination with an energy aggregation node, finally closed-loop regulation is constructed through calibration write-back, the safety and stability of zinc chloride preparation are improved, and the method is suitable for large-scale popularization and application. And efficient utilization and clean production of solid waste are promoted.

The invention relates to an electrode and a membrane electrode assembly for a zero-gap electrolyzer, a zero-gap electrolyzer, the use of a metal phthalocyanine, and a method for producing an electrode. An electrode (1, 1a, 1b) for a zero-gap electrolyzer (11) comprises a metal phthalocyanine (4). In this way, a particularly effective and cost-efficient catalyst can be provided.

The invention belongs to the technical field of monatomic nano-enzyme material preparation, and particularly relates to a nano-enzyme preparation method for acetylcholin esterase activity detection. The Ni-NiO heterojunction material is successfully synthesized by adopting Ni-MOF as a carrier and accurately regulating and controlling the ratio of nitrogen to air in the ultrafast Joule hot calcination process. The material has rich oxygen vacancies and metal Ni sites, the oxygen vacancies and the metal Ni sites can effectively serve as anchoring sites of Pt single atoms, the loading capacity and dispersity of the Pt single atoms are remarkably improved, and therefore the excellent nano-enzyme catalytic activity is shown. In addition, the preparation method disclosed by the invention is simple and convenient in process and has a wide industrial application prospect. An acetylcholin esterase activity colorimetric sensing method constructed on the basis of the nanometer enzyme for acetylcholin esterase activity detection prepared by the method has extremely high sensitivity and low detection limit. The detection limit of the technology can be as low as 0.037 mU / mL, the problem that the sensitivity of a traditional detection method in a low-concentration sample is insufficient is remarkably solved, and remarkable clinical application potential is shown.

The invention discloses a sulfide-based composite solid-state electrolyte, a preparation method thereof and a lithium metal solid-state battery, sulfide is subjected to specific bifunctional surface grafting modification by using a silane coupling reagent with sulfydryl and epoxy bonds, then the sulfide is introduced into a polymer precursor liquid, and the sulfide-based composite solid-state electrolyte is prepared through light-heat curing reaction synergy. A flexible and rigid cross-linked network is formed, the sulfide-based composite solid-state electrolyte with high ionic conductivity and high mechanical strength is obtained, the interface stability of the sulfide-based composite solid-state electrolyte in the charge-discharge process is ensured, for example, the sulfide-based composite solid-state electrolyte in the embodiment 1 has high ionic conductivity (3.81 mS / cm), and the interface stability of the sulfide-based composite solid-state electrolyte in the embodiment 2 is ensured. The lithium-lithium symmetric battery prepared by the method has the advantages of excellent flexibility, high tensile strength (7.9 Mpa) and wide electrochemical window (5.1 V), the lithium-lithium symmetric battery can stably circulate for 2000h, and the whole battery can stably circulate for 2000 circles at the room temperature at the rate of 4C, so that the lithium-lithium symmetric battery has great industrial application value.

The invention discloses latex skeleton aerobic granular sludge and a preparation method thereof, and belongs to the technical field of sewage treatment. The aerobic granular sludge takes a porous natural latex carrier as a core skeleton, anaerobic sludge is fixed on the carrier, and after being mixed and wrapped with a sodium alginate solution, the mixture is dropwise added into a calcium chloride solution to be cured to form gel particles. The preparation method comprises the following steps: crushing the natural latex, screening to obtain particles with the particle size of 0.4-1.2 mm, and soaking the particles in alkali liquor with the pH value of 10-12; the method comprises the following steps: centrifugally concentrating anaerobic sludge to 10000 to 20000 mg / L; mixing the treated latex carrier, anaerobic sludge and a 1%-5% sodium alginate solution according to a volume ratio of 5: (2-5): (2-5); dropwise adding the mixture into a calcium chloride solution with the concentration of 3-7%, and curing to form gel particles; and putting the gel particles into a sewage treatment aerobic tank, injecting domestic sewage, and carrying out aeration domestication for 3-6 days until the particles become earthy yellow. The granular sludge prepared by the invention has the advantages of stable structure, good settling performance and high pollutant removal efficiency.

The invention relates to the technical field of retired ternary power battery recovery, and particularly discloses a method for preferentially extracting lithium and recovering valuable metals from a retired ternary lithium battery and application of the method. According to the method, the traditional process is broken through the preferential lithium extraction, and efficient recovery of lithium, Ni, Co and Mn is realized by utilizing'fast-medium-slow 'multi-stage cooperation of a composite reducing agent and accurate adaptation of roasting and leaching parameters, so that the method has the advantages of low cost, high efficiency, low energy consumption and the like, and is suitable for large-scale industrial production. The method is low in energy consumption and environment-friendly, and is applied to resource recycling of the retired ternary lithium battery, and the precursor can be used for reproducing a positive electrode material or used for a catalytic material.