52results about How to "Simple recycling process" patented technology

The invention discloses a method for regenerating a lithium iron phosphate positive electrode material with assistance of negative electrode lithium and a waste diaphragm. The method comprises the following steps: pretreating a waste lithium iron phosphate battery to obtain a waste lithium iron phosphate positive electrode plate, a waste diaphragm and a negative electrode plate; extracting residual lithium in the negative electrode by using a water immersion method, and uniformly mixing the recycled lithium with the waste positive electrode powder and the waste diaphragm; putting into a tubular furnace, introducing protective gas for thermal repair, and cooling to obtain a regenerated lithium iron phosphate positive electrode material; according to the method, residual lithium in a negative electrode serves as a lithium source, a diaphragm contained in the battery serves as a reducing agent and a carbon source at the same time, the waste lithium iron phosphate battery positive electrode material is directly repaired through mixed high-temperature roasting, and the obtained lithium iron phosphate positive electrode material has good electrochemical performance. No additional reagent is needed, and a brand-new thought is provided for regeneration of the lithium iron phosphate.

The utility model provides a waste lithium battery positive electrode material regeneration device, the regeneration device comprises a salting-out tank, a regeneration tank, a transition pipe, a heating assembly and a spiral stirring assembly, a regeneration chamber is formed in the regeneration tank, and the regeneration chamber is communicated with one end of the transition pipe; the other end of the transition pipe is communicated with the discharge end of the salting-out tank; the spiral stirring assembly comprises a driver, a rotating plate and a plurality of propeller blade groups; the rotating plate is arranged at the bottom of the regeneration chamber; one surface of the rotating plate is connected with the driving end of the driver; the driver drives the rotating plate to rotate; the heating assembly comprises a plurality of heating rods; the heating rods are arranged on the other surface of the rotating plate at intervals; and each propeller blade group is arranged on the peripheral wall of the heating rod in a surrounding manner. According to the device, the heating assembly comprises a plurality of heating rods, and each propeller blade group is arranged on the peripheral wall of the heating rod in a surrounding manner, so that salting-out particles at the bottom of the regeneration chamber are turned and stirred, the contact time of the salting-out particles and the heating rods is prolonged, and the mixing uniformity and the sintering sufficiency of the salting-out particles are ensured.

The invention belongs to the technical field of waste battery recycling, and discloses an anti-creeping waste battery recycling device which comprises a vibration mechanism, the vibration mechanism comprises a motor, a rotating wheel is rotationally connected to the motor, and an eccentric wheel is fixedly connected to the side, away from the motor, of the rotating wheel; through cooperation of an eccentric wheel, a screening frame and other structures, disassembly of a main body shell is facilitated, a motor is started to vibrate a placement frame on the screening frame through transmission, the internal structure of a battery is loosened through the frequency and amplitude of vibration, and meanwhile, in the process that the placement frame drives a storage battery main body to move upwards, the storage battery main body is separated from the storage battery main body. The disassembling groove in the storage battery main body collides with the disassembling hammer, disassembling of a shell and an internal structure of the storage battery main body can be accelerated, useful components can be separated from the storage battery main body more easily through vibration and impact, follow-up screening and processing time is shortened, and follow-up regeneration of the useful components of the waste storage battery main body is facilitated.

The present application relates to an underwater equipment recovery device, and to the technical field of underwater equipment recovery, which includes a recovery box; the recovery box is a structure with two openings at both ends, with a partition net at one end and a sliding door at the other end; a first slide groove is provided on both inner side walls of the recovery box near the sliding door, the length direction of the first slide groove is the vertical direction, and two first sliders are slidably arranged in the first slide groove; a second slide groove is provided on the top wall and the bottom wall of the recovery box, the length direction of the second slide groove is the horizontal direction, and a second slider is slidably arranged in the second slide groove; there are two sliding doors, and the ends of the two sliding doors that are close to each other are both rotatably connected to the corresponding two first sliders, and the ends that are away from each other are both rotatably connected to the corresponding second sliders; a driving component is also provided in the recovery box. The present application can automatically open the sliding door when recovery is required to facilitate the equipment to enter the recovery box, and close the sliding door when recovery is not required, effectively preventing large foreign objects from mistakenly entering the recovery box.

The invention relates to an amidoxime functionalized nanocellulose porous material and a preparation method and application thereof.The preparation method comprises the steps that nanocellulose and a dispersing agent are fully mixed to prepare emulsion, then the emulsion and a cross-linking agent micromolecular monomer containing nitrile functional groups are subjected to cross-linking polymerization through a nucleophilic substitution reaction, and the amidoxime functionalized nanocellulose porous material is obtained. And then carrying out amidoximation reaction on nitrile functional groups contained in the cross-linked polymer to prepare the amidoxime functionalized nano-cellulose porous material. The preparation method is simple, and reaction conditions are mild; the obtained amidoxime functionalized nanocellulose porous material has a hierarchical pore structure, a relatively high specific surface area and various active binding sites, and can be used for efficiently removing heavy metal ions in industrial wastewater; and the amidoxime functionalized nano cellulose porous material can be simply recycled, and the amidoxime functionalized nano cellulose porous material can still keep a relatively high adsorption effect after 20 times of cyclic adsorption.

The invention relates to the technical field of food packaging, and discloses a flour packaging bag based on single material compositing, which comprises a middle-sealed folding bag and an eight-edge-sealed folding packaging bag, and comprises a first bag body and a first bag side applied to the middle-sealed folding bag, one side edge of the bag body is connected end to end and then is sealed to form a middle sealing part, and the other side edge of the bag body is sealed to form an eight-edge-sealed folding packaging bag. The first bag body and one end face of the bag side are connected and then are subjected to edge sealing to form a transverse sealing part, the position, located on the transverse sealing part, of the first bag body is coated with an adhesive tape, and after middle sealing is completed, the middle sealing part is attached to the adhesive tape. By adopting the unstretched PE film composite design, the tensile strength, the heat sealing performance and the tear resistance of the packaging bag are remarkably improved, the heat sealing temperature is as low as 120 DEG C or below, and the bag breaking risk is reduced; the method is suitable for complex bag shape processing; through the environment-friendly solvent-free adhesive and the dry type compound technology, the production efficiency is improved, the cost is reduced, meanwhile, efficient recycling and environment-friendly performance are achieved, and the packaging requirement of heavy objects is met.

The invention relates to an adsorption material and a method for adsorbing and extracting lithium. The adsorption material comprises cross-linked polymer resin; the cross-linked polymer resin comprises a polymer chain skeleton; the macromolecular chain skeletons are cross-linked through active adsorption groups. The adsorption material provided by the invention can selectively adsorb calcium and magnesium and selectively adsorb lithium, has an excellent adsorption effect and good selective adsorbability, can be desorbed by adopting a three-phase desorption technology, and is suitable for extracting lithium from low-calcium and low-magnesium salt lake brine through an adsorption method; the method for adsorbing and extracting lithium provided by the invention is simple in process and low in operation cost, can realize green and efficient lithium recovery of the low-calcium and low-magnesium salt lake, and is beneficial to industrial application.

The invention provides a glue-free cosmetic brush made of a PBT material, and relates to the technical field of cosmetic brushes. The glue-free cosmetic brush made of the PBT material comprises a brush head, a brush tube and a brush handle, and further comprises a brush head fixing piece, one end of the brush head is fixed in the brush head fixing piece, the brush head fixing piece is fixed at one end of the brush tube, and the other end of the brush tube is fixed on the brush handle; the brush head, the brush head fixing piece, the brush pipe and the brush handle are all made of PBT materials. The whole cosmetic brush does not need glue, harmful gas cannot be generated in the preparation and use process, glue removal is not needed during recycling, recycling is more convenient, and the requirement for environmental protection is met. The brush bristles, the brush bristle fixing piece, the brush pipe and the brush handle are all made of the same raw material PBT plastic, so that the cosmetic brush does not need to be disassembled and classified when being recycled, the whole cosmetic brush is recycled for waste recycling, the recycling procedure is simplified, the cost is saved, and economic benefits are achieved.

The invention relates to the field of aluminum electrolysis waste resource recovery, in particular to a method for efficiently recovering lithium and aluminum metal components in aluminum electrolysis waste. The method comprises the following steps: crushing waste, mixing with aluminum-containing waste and sulfuric acid, roasting, crushing and modifying the roasted waste, adding water, stirring, and filtering to obtain lithium-containing filtrate; after the filtrate is subjected to an impurity removal step, the lithium salt reacts with water-soluble carbonate or phosphate to generate a lithium finished product and mother liquor, and the mother liquor can be recycled; the filter residue and the silicon-containing substance are roasted to generate aluminum-containing oxide and silicon tetrafluoride gas, the aluminum oxide can be recycled, the treated gas can be converted into ammonium fluoride and silicon dioxide, the silicon dioxide can be further recycled, and the ammonium fluoride is used for preparing high-purity aluminum fluoride. According to the method, efficient recovery of metal components such as lithium and aluminum is achieved, and the utilization rate and economic benefits of resources are remarkably improved.

The method comprises the following steps: predicting the service life of the depoling liquid: shunting a depoled solution in a depoling reaction kettle, carrying out solid-liquid separation on part of the depoled solution, adding a solution stabilizer into the separated pure solution at a constant temperature, fully stirring, and measuring the density of the solution; lime milk is added into the invalid depoling liquid under the stirring condition, solid-liquid separation is carried out, and a solution obtained after solid-liquid separation is the regenerated depoling liquid. The method for predicting the service life of the depoling liquid is simple, the regeneration process of the depoling liquid after failure is simple, the controllability is high, green production in the depoling process can be achieved, and waste liquid and solid waste are not discharged.

The invention relates to a preparation and use method of a soft soil curing agent, in particular to a preparation and use method of a straw-based soft soil curing agent. The technical problems that an existing soft soil curing agent is low in strength and poor in stability are solved. The method comprises the following steps: crushing straw, immersing the crushed straw into a NaOH solution, stirring, and filtering to obtain filtrate and a solid-phase substance; uniformly stirring the filtrate, water glass and laccase, and adjusting the pH value to 8-10 to obtain a composite exciting agent which is marked as a component A; performing high-temperature pyrolysis on the solid-phase substance to obtain porous hard carbon powder, and uniformly mixing the porous hard carbon powder with slag, fly ash and glass powder to obtain a mixed cementing material marked as a component B; the component A and the component B are combined to form the soft soil curing agent. The curing agent is added into to-be-cured soft soil, the mixture is uniformly mixed and cured, after curing, the cohesive force reaches 95 KPa or above, the internal friction angle tan alpha reaches 0.02951 and is 1.46 times and 7 times that of the cured soft soil with cement as the curing agent, and the curing agent can be used in soil engineering.

This invention belongs to the field of organic synthesis technology, specifically relating to a method for preparing 3-hydroxy-2-methylbenzoic acid. The method comprises the following steps: mixing 3-amino-2-methylbenzoic acid, an inorganic acid, a catalyst, and water for hydrolysis to obtain crude 3-hydroxy-2-methylbenzoic acid; extracting the crude 3-hydroxy-2-methylbenzoic acid to obtain an extract phase and a raffinate phase; and sequentially washing and concentrating the extract phase to obtain the 3-hydroxy-2-methylbenzoic acid. The method provided by this invention is simple, generates no waste, and has a relatively simple ammonium salt recovery process, making it a green and environmentally friendly synthesis process. As shown in the example data, the yield of 3-hydroxy-2-methylbenzoic acid synthesized by this invention can reach over 94%, and the purity can reach up to 98%, demonstrating good industrial value.

The invention relates to the technical field of zirconium alloy material preparation, in particular to a preparation method of a nuclear-grade zirconium or zirconium alloy cast ingot containing scrap-like residues. The method comprises the following steps: 1) identifying, classifying and collecting zirconium or zirconium alloy scrap-like residues; (2) size and surface treatment is conducted on the scraps; (3) sampling and detecting the treated scraps; (4) the total feeding amount and the scrap adding proportion are determined, the alloy element adding amount is calculated, and the qualified scrap is evenly mixed with sponge zirconium according to the proportion; 5) pressing the mixed scraps, zirconium sponge and alloy addition raw materials into electrode blocks, and welding a plurality of electrode blocks to obtain a consumable electrode for smelting; according to the method, the residual material recovery process and flow are simplified, the labor intensity and the cost are reduced, the high-quality nuclear grade cast ingot meeting the requirement is prepared, and the residual material recovery efficiency is improved.

The application discloses a recycling method of by-product cyclohexene distillation still residue, and belongs to the technical field of recycling of by-product cyclohexene distillation still residue. The still residue is analyzed by liquid chromatography-mass spectrometry, and the chlorocyclohexane in the still residue is reacted with sodium disulfide under the condition of a catalyst. After static separation, the oil phase is refined to obtain dicyclohexyl disulfide and cyclohexene, and the water phase can be recycled. The catalyst is composed of sulfonated castor oil and a phase transfer catalyst, can improve the conversion rate of chlorocyclohexane and the selectivity of dicyclohexyl disulfide, and greatly shortens the reaction time. The application can realize recycling and utilization of the still residue, avoids waste of resources and pollution to the environment, saves the chemical production cost, and meets the environmental protection concept of green chemical industry.

The present invention discloses a method for directly separating impurities from solid lithium phosphate. The method of the present invention comprises the following steps: pre-treating the lithium phosphate raw material; adding the pre-treated lithium phosphate raw material to a mixed solution containing a penetrant, a complexing agent, and a buffer solution, cooling after a high temperature reaction, and continuing a low temperature reaction; filtering and separating after the reaction is completed, washing the obtained filter cake, and recycling the filtrate; drying the washed filter cake to obtain the lithium phosphate after impurities are removed. The method of directly separating impurities from solid lithium phosphate of the present invention does not need to dissolve the solid lithium phosphate, can effectively remove calcium and magnesium impurities in the solid lithium phosphate, has a high product yield, and the lithium phosphate product obtained after purification meets the requirements of the battery production industry.

The invention belongs to the technical field of polyester recovery, and relates to a method for preparing BHET by catalyzing ethylene glycol alcoholysis of PET. According to the method, gamma-Fe2O3 (at) meso-SiO2-DBU is adopted as a catalyst, the gamma-Fe2O3 (at) meso-SiO2-DBU is composed of gamma-Fe2O3 (at) meso-SiO2 and DBU, the gamma-Fe2O3 (at) meso-SiO2 is of a core-shell structure, the core is gamma-Fe2O3, the shell is composed of meso-SiO2, the DBU and the shell form ion pairs through electrostatic attraction, and the ion pairs are enriched in mesopores of the meso-SiO2. The problem that the yield of BHET is low in an existing magnetic separation heterogeneous catalysis system is solved, the conversion rate of PET and the yield of BHET are effectively increased, and the catalyst is stable in structure and lasting in catalytic activity, can be magnetically separated and recycled and adapts to the strict reaction conditions for catalyzing ethylene glycol to depolymerize PET.

The invention belongs to the technical field of harmless treatment of hazardous waste residues and resource recovery of rare and noble metals, and particularly relates to a method for selectively recovering thallium from zinc-cadmium residues. The method comprises the following steps: 1) preparing zinc-cadmium slag and water into slurry according to a certain solid-to-liquid ratio, adding a sulfur-containing reducing agent and alkali, uniformly mixing, and heating to react for a certain time; (2) after the reaction is completed, solid-liquid separation is conducted, thallium-containing leaching liquid and treated tailings are obtained, and the tailings are zinc and cadmium residues and can be directly returned to the zinc and cadmium recycling procedure; and (3) zinc powder is added into the leachate for replacement, thallium is recycled from the leachate, then solid-liquid separation is conducted, thallium and zinc liquid are obtained through recycling, and the process can be returned to the zinc recycling procedure. On the basis of sulfur-containing reducing agent treatment, zinc powder replacement is combined, and monovalent thallium and trivalent thallium in the zinc-cadmium slag can be recovered together in the form of simple substances.

The invention relates to the technical field of waste silicone rubber recovery, and particularly discloses a waste silicone rubber recovery treatment system which comprises a shell, the top of the shell is provided with a feeding hopper for waste silicone rubber to enter, and the outer side of the shell is provided with four supporting columns distributed in a rectangular shape; and a discharge port for discharging crushed waste silicone rubber is formed in the bottom of the shell. Through the arrangement of the crushing assembly, when the waste silicone rubber is recycled, the put waste silicone rubber can be crushed to form silicone rubber particles, so that the silicone rubber particles can be conveniently utilized as required subsequently, and environmental pollution caused by direct discarding of the silicone rubber particles into the environment is avoided; and the dust collection assembly can suck and filter dust impurities and silicon rubber powder generated during crushing of the waste silicon rubber, so that the dust impurities are prevented from being mixed into silicon rubber particles, and subsequent utilization of the silicon rubber particles is facilitated.

The invention discloses a deep-eutectic solvent, preparation thereof and application of the deep-eutectic solvent in recovery of a waste ternary lithium battery positive electrode material. The eutectic solvent is composed of ethylene glycol and lactic acid, and the molar ratio of ethylene glycol to lactic acid is 1: 10-10: 1. According to the method, a new eutectic solvent system is creatively constructed, selective leaching of the lithium element in the positive electrode material of the waste ternary lithium battery can be achieved, the coprecipitation process of key metal precursors such as nickel, cobalt and manganese is synchronously promoted, high-valued circulation and utilization of the waste ternary lithium battery are promoted, and the method is suitable for industrial production. The complex process of traditional multi-metal step-by-step separation is avoided, and the operation steps are simplified. In addition, the eutectic solvent can be recycled for more than five times, so that the battery recycling cost is reduced. The recycling method provided by the invention also greatly widens the separation and recycling ways of valuable metals in the waste batteries, and shows wide application potential and important value in the field of resource recycling.

The invention discloses a composite ionic compound which comprises a carrier, a bridging agent and an adsorbent, the bridging agent is grafted to the carrier, and the adsorbent is grafted to the bridging agent. In addition, the invention also provides a preparation method of the composite ionic compound and application of the composite ionic compound for recovering metal ions.

The utility model provides a recycling fence for recycling steel pipes, which belongs to the technical field of steel pipe recycling fences and comprises a steel frame recycling fence, the steel frame recycling fence is provided with a base and a guardrail arranged on the base, cross beams are arranged on the left side and the right side of the guardrail, the front side of the guardrail is an opening portion, and a back plate is arranged on the rear side of the guardrail. Two mounting parts are welded to the base through channel steel, folding clamps are arranged on the mounting parts and comprise mounting bases arranged at the tops of the mounting parts, two grippers are hinged to the mounting bases, hydraulic linkage rods are arranged in the mounting bases and hinged to the two grippers, and when the two grippers are completely unfolded, the tops of the grippers abut against the cross beam; the problems that in the prior art, due to the tubular structure characteristic of steel pipes, after the steel pipes stacked at will are bundled, steel pipe bundles are prone to moving and contracting in the transferring process, even the steel pipes fall off, the construction efficiency is affected, safety accidents are likely to be caused, and the safety of personnel is threatened are solved.

This invention discloses a method and system for producing mesophase carbon microspheres. The method involves hydrogenating purified catalytic slurry, followed by separation to obtain light fraction, middle fraction, and tail oil. The middle fraction is divided into two streams: the first stream undergoes cracking, with the cracking products recycled; the second stream undergoes a first heat treatment, and the heat-treated product is pulverized to obtain a solid first feed stream, a first solvent, and silicone oil, which are then subjected to a second heat treatment. The resulting reaction product is then centrifuged, washed, and dried to obtain mesophase carbon microspheres. The production system includes a purification unit, a hydrogenation reaction unit, a gas-liquid separation unit, a fractionation unit, a cracking reaction unit, a first heat treatment unit, and a second heat treatment unit. This invention proposes an optimized approach to preparing mesophase carbon microsphere raw materials, yielding high-quality mesophase pitch raw materials and mesophase carbon microsphere products.

The invention relates to the technical field of material purification, in particular to a method for recycling silica fume in the production process of silicon iron. The method for recycling the silica fume comprises the following steps: (1) carrying out winnowing purification on the collected silica fume; (2) carrying out magnetic separation purification on the silica fume obtained in the step (1); (3) drying the micro silicon powder obtained in the step (2) at low temperature; (4) feeding the silica fume obtained in the step (3) into airflow classification equipment for particle size separation; (5) sintering the silica fume obtained in the step (4) at high temperature; (6) carrying out acid pickling, acid leaching and drying on the silica fume obtained in the step (5); (7) cooling the silica fume obtained in the step (6); and (8) crushing and screening the micro-silicon powder obtained in the step (7) to obtain the micro-silicon powder with different particle sizes. The cyclic utilization rate of silicon resources is improved, the cost is low, and the economic value of silicon is improved.

The invention discloses a decommissioned photovoltaic junction box dismantling device, and relates to the technical field of photovoltaic module recycling, the decommissioned photovoltaic junction box dismantling device comprises a frame, a conveying mechanism is fixedly arranged at the top of the frame, a first air cylinder is fixedly arranged at the top of the frame, the first air cylinder is located right above the conveying mechanism, and a movable frame is fixedly connected to the outer side of the output end of the first air cylinder; a second air cylinder is fixedly arranged at the top of the movable frame, a connecting frame is fixedly installed at the bottom of the output end of the second air cylinder, limiting rods are fixedly arranged on the two sides of the top of the connecting frame, the tops of the limiting rods slidably extend to the outer side of the movable frame, and a driving motor is fixedly arranged on the outer side of the connecting frame; the output end of the driving motor is in driving connection with a lead screw, and the outer surface of the lead screw is sleeved with a movable rod in a threaded mode. The invention effectively solves the problems of low efficiency, easy damage of parts, waste of resources and incapability of classified collection in the existing dismantling mode, and is suitable for recycling and dismantling operation of the junction box of the retired photovoltaic module.

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.

The application provides a plastic woven bag recycling and reusing processing device and processing technology, and relates to the technical field of plastic recycling and regeneration. The device comprises a first support frame and a second support frame. The first support frame is provided with a feeding plate, a discharging plate, an upper and lower feeding component, a first mounting plate and a conveying component. The second support frame is provided with a second mounting plate, a transfer component and a regeneration pretreatment component for plastic woven bag regeneration pretreatment. The application completes regular material conveying by means of an automatic feeding and discharging structure, realizes material station transfer by means of a transfer assembly, stably fixes the woven bag by means of an adjustable clamping structure, and then separates impurities on the surface of the material by means of a reciprocating movable multi-group rotating treatment structure. The application can automatically complete the whole process operation of feeding, transferring, pretreating and discharging. The application can meet the processing requirements of woven bags of different specifications, can prepare qualified raw materials meeting the regeneration and granulation standards, and effectively improves the resource recycling and regeneration utilization efficiency of waste plastic woven bags.

The invention discloses a multifunctional metal material testing device, and relates to the technical field of metal material performance testing, and the multifunctional metal material testing device comprises a workbench which is used for performing a multifunctional test on a metal material; the electromagnetic three-stage separation assemblies are symmetrically arranged on the top of the workbench, through the adoption of an electromagnetic three-stage separation structure, instant fine separation of abrasive dust is achieved, a first-stage high-intensity magnetic field is responsible for efficiently capturing strong-magnetism abrasive dust, and a second-stage adjustable magnetic field is specially designed for accurately separating weak-magnetism abrasive dust; the third stage is used for collecting high-purity non-magnetic abrasive dust, in the process, the adsorption plate and the scraping plate work cooperatively, effective adsorption and smooth stripping of the magnetic abrasive dust are ensured, and the dynamic separation mechanism avoids the situation that a mixture is formed due to violent friction and collision and easy electrostatic adsorption when the abrasive dust with different attributes is mixed from the source; and the high purity and value of the recycled material are fundamentally guaranteed.

This invention discloses a sintering method for controlled migration of bismuth. By independently granulating bismuth-containing materials using a chlorine- and carbon-rich process and distributing the granules to the lower middle part of the sintering layer during sintering, a localized high-chlorine, high-reducing atmosphere micro-region can be created during sintering. This promotes the concentrated stripping of bismuth from the sintered mineral phase. Simultaneously, segmented dust collection of the sintering flue gas allows for the concentrated capture of flue gas dust during the peak bismuth volatilization phase, resulting in high-bismuth flue gas dust. The sintering method of this invention is simple, easy to control, and achieves efficient collection of bismuth, overcoming the bottleneck of dispersed and difficult-to-recover bismuth in existing technologies. It is applicable to most existing sintering production lines, requiring no additional independent production line, resulting in low overall investment costs and facilitating rapid market promotion and application.

A novel integrated method for recovering lithium iron phosphate and ternary materials is applied to the field of recycling and reuse of positive electrode materials for lithium-ion batteries. The preparation method comprises the following steps: an acid solution is prepared according to a stoichiometric ratio and placed in a beaker, lithium iron phosphate waste is added thereto, and a constant temperature magnetic stirrer is used to fully stir the solution to perform a leaching reaction. After the reaction is completed, the ternary material is added thereto for further stirring, and a chelating agent is added, and a coprecipitation reaction is performed by controlling the pH value, reaction time, reaction temperature, etc. After centrifugation and drying, the obtained material is subjected to high-temperature calcination to prepare a ternary positive electrode material with a phosphate composite coating layer. The present invention adopts an acid leaching process and a coprecipitation process to uniformly recover the ternary waste material and the lithium iron phosphate waste material, repairs the ternary waste material, and provides it with a composite coating layer such as phosphate, thereby obtaining a recycled material with excellent performance.