34results about How to "Reduce water content" patented technology

The invention discloses a low-moisture and high-safety lithium battery diaphragm and a preparation method thereof.The low-moisture and high-safety lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises modified gamma-phase superfine porous aluminum oxide, the modified gamma-phase superfine porous aluminum oxide is obtained by modifying gamma-phase superfine porous aluminum oxide through a silane coupling agent, and the modified gamma-phase superfine porous aluminum oxide is prepared from modified gamma-phase superfine porous aluminum oxide. The silane coupling agent is one of a vinyl silane coupling agent and a methyl silane coupling agent. According to the invention, surface modification is carried out on gamma-phase superfine porous alumina by using a silane coupling agent with a hydrophobic group, so that the diaphragm has high ionic conductivity, good high temperature resistance and good liquid absorption and retention capability, and meanwhile, the water content of the diaphragm is reduced.

The utility model discloses a dry flour storage tank with a flour output mechanism, and relates to the technical field of dry flour storage. The device comprises a fixed frame and a storage tank, the fixed frame is provided with a material turning mechanism, a dehumidification mechanism and an output mechanism, and the material turning mechanism comprises a lifting assembly and a material blocking assembly; the lifting assembly comprises a motor fixedly connected to the top face of the storage tank, the output end of the motor is fixedly connected with a rotating rod, the bottom end of the rotating rod extends into the fixing frame, the rotating rod is rotationally connected with the fixing frame, and the outer wall of the rotating rod is fixedly connected with spiral blades. A plurality of supporting rods are fixedly connected to the inner wall of the storage tank, and connecting sleeves are fixedly connected between the multiple supporting rods. Through the arrangement of the material turning mechanism, flour at the bottom in the storage tank can be smashed and conveyed upwards, after the flour is conveyed to the top of the connecting sleeve, the flour can be scattered and fall down, and blockage caused by flour caking is avoided.

The utility model relates to the technical field of papermaking mesh production, and discloses a drying device for monofilament papermaking mesh production, which comprises a shell, a cavity is arranged in the middle of an inner cavity of the shell, a motor is fixedly mounted on the rear portion of the inner cavity of the cavity, and a rotating handle is fixedly connected onto an output shaft of the motor through a coupler. The front portion of the rotating handle is movably connected with a traction rod through a shaft, the bottom end of the traction rod is movably connected with a lifting rod through a shaft, the lifting rod is movably connected with the bottom of an inner cavity of the cavity in a sleeved mode, a connecting block is fixedly installed at the bottom end of the lifting rod, and the bottom of the connecting block is movably connected with a stretching roller through a shaft. The stretching roller is driven by the motor to stretch and shake the monofilament papermaking mesh, material shrinkage stress is counteracted, mesh hole blockage and deformation caused by monofilament winding or adhesion are avoided, surface roughness or protrusions are reduced through mesh piece tensioning, the flatness requirement is met, water in the material is migrated through shaking, the water content is reduced, and therefore the needed drying time is shortened. The device working efficiency is improved.

The utility model discloses a fine-grade tailing dehydration device for lead ore processing, which relates to the technical field of tailing dehydration, and comprises a plurality of sedimentation tanks which are communicated with one another, drainage gates are arranged among the sedimentation tanks, and the drainage gates can adjust the height of flowing water between the adjacent sedimentation tanks. The sedimentation tank located at the tail end is communicated with a dehydration device through a water pipe, a water throwing tank is rotationally arranged in the dehydration device, the peripheral side of the water throwing tank is of a latticed double-layer structure, and the double-layer structure of the water throwing tank is filled with a filter element of an annular structure. According to the fine-grade tailing dewatering device for lead ore processing, the dewatering device is arranged, water passing through the sedimentation tank flows into the dewatering device, the water is thrown out after being blocked by the filter element through rotation of the water throwing tank, and tailings are left to be stored in the water throwing tank, so that the water content in the tailings is reduced; and the water can also be poured into the dehydration device to be dehydrated again.

The present application discloses a positive electrode active material composition, an aqueous positive electrode slurry, a positive electrode sheet, a secondary battery, and an electric device. The positive electrode active material composition comprises a first positive electrode active material, a second positive electrode active material, and a third positive electrode active material. The volume mean particle diameter Dv50 of the first positive electrode active material is A1 µm, wherein 0.2≤ A1≤0.8; the volume mean particle diameter Dv50 of the second positive electrode active material is A2 µm, wherein 1.0≤A2≤2.5; and the volume mean particle diameter Dv50 of the third positive electrode active material is A3 µm, wherein 3.0^A3^6.0. According to the present application, the positive electrode sheet can have relatively high compaction density and also have relatively low moisture content.

The utility model provides a device and a system for producing an optical fiber preform based on industrial grade D4. The device for producing the optical fiber preform based on the industrial grade D4 comprises a coarse treatment device, a fine treatment device, a low-boiling-point impurity treatment device and a high-boiling-point treatment device which are communicated in sequence, an anion-cation exchange resin membrane and a molecular sieve are arranged in the fine treatment device to remove metal ions and anion impurities in the D4 liquid, the low-boiling-point impurity treatment device is used for separating low-boiling-point impurities in the D4 liquid, the high-boiling-point treatment device is used for separating high-boiling-point impurities in the D4 liquid, and a gas outlet of the high-boiling-point treatment device is communicated with the combustor. According to the device provided by the utility model, the existing commercially available industrial grade D4 is utilized, the adverse effect of gel on deposition production equipment in the D4 gasification process is relieved, the tolerance requirement of the deposition equipment on the purity of the raw material D4 is increased, and the production cost of the optical fiber preform can be reduced.

The invention discloses a method for preparing distillation-free biodiesel from low-acid-value waste oil and fat, which comprises the following steps of: degumming the low-acid-value waste oil and fat, removing metal ions, and dehydrating for the first time to obtain pretreated oil and fat; carrying out subcritical ester exchange reaction on the pretreated grease and methanol to obtain crude fatty acid methyl ester; and carrying out dealcoholization, alkali washing, water washing and secondary dehydration on the crude fatty acid methyl ester to obtain the distillation-free biodiesel. The method is simple, energy consumption is low, no extra catalyst needs to be added, the content of fatty acid methyl ester in the prepared biodiesel is 96.5% or above, and the yield can reach 99% or above.

The application provides a preparation method of a sodium-rich and low-water-content Prussian blue positive electrode material, which comprises the following steps: dissolving sodium ferrocyanide or a hydrate thereof and a complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution A; dissolving a transition metal salt or a hydrate thereof, a sodium supplementing agent, a complexing agent and an auxiliary complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution B; continuously stirring solution A and solution B by dropwise adding them into a container with a positive pressure inert gas atmosphere and at a certain temperature, continuing to stir for a period of time after the dropwise adding is completed, and then standing, centrifuging and vacuum drying to obtain the Prussian blue positive electrode material. The Prussian blue positive electrode material comprises a mixed phase structure of rhombic phases and cubic phases, has the characteristics of high sodium content and low water content. The battery assembled by using the positive electrode material obtained by the method has a theoretical specific capacity close to the theoretical specific capacity under a small current density and still has a high specific capacity under a large current density.

This invention provides an absorbent for capturing carbon dioxide and a method for capturing carbon dioxide. By volume percentage, the absorbent comprises 20-60% glycine salt aqueous solution, 10-50% triethylene glycol monomethyl ether, 5-10% ethylene glycol, and the balance being water. This absorbent combines the advantages of glycine salt systems, such as low volatility, non-toxicity, safety, and better antioxidant degradation resistance, while avoiding the risk of solid precipitates forming after absorption by the glycine salt system, which could cause pipeline blockage.

The invention relates to the technical field of switch cabinets, in particular to a high-low voltage switch cabinet with an overload protection function. Comprising a protective shell, the protective shell is provided with an intelligent control panel, a heat dissipation device is installed in the protective shell, a plurality of cabinet bodies are installed in the protective shell, and circuit breakers are arranged on the cabinet bodies; the multiple first moving plates are slidably connected to the protective shell, multiple second moving plates are slidably connected into the protective shell, and the first moving plates are located between the adjacent second moving plates and the protective shell; the first exhaust fan is mounted on the protective shell; and the first draft fan is mounted in the fixed pipe. According to the invention, through the combined action of the first draft fan and the first exhaust fan, when the heat dissipation device in the protection shell breaks down, gas in a static state in the protection shell is switched into a flowing state, and emergency heat dissipation processing is carried out on the interior of the protection shell, so that normal use of each electrical element on the cabinet body is ensured.

A continuous oxidation reaction process of o-xylene chloride includes batching, continuous oxidation, tail gas condensation, flash distillation, acetic acid recovery, tail gas treatment and crude anhydride treatment steps. A bubbling reaction tower with a dehydration section and other matching equipment are used as a continuous o-xylene chloride liquid-phase air reaction device. The device, combined with the oxidation process of the invention, can continuously discharge the water generated during the reaction from the reaction system, greatly reduce the inhibitory effect of water on the reaction, and improve the product yield; at the same time, the device adopts a continuous feeding and discharging production mode to greatly improve the utilization efficiency of the reaction device, and avoid the frequent pressure increase and reduction, temperature increase and decrease of the reaction equipment caused by the intermittent process, which causes equipment fatigue damage.

The application discloses a method for detecting the effect of ground pre-grouting of a vertical shaft by using geophysical logging, before grouting, 1-3 grouting holes are selected and drilled to the designed depth; a geophysical logging system is arranged; the selected grouting holes are subjected to geophysical logging before and after grouting by using the geophysical logging system; the physical properties of the stratum reflected by the geophysical logging data of the grouting holes before and after grouting are compared and analyzed, the change trend of the water conductivity and stability of the grouted stratum is obtained, and the grouting water plugging and reinforcement effect is evaluated. The geophysical logging method is used for detecting the water plugging and reinforcement effect of the ground pre-grouting of a vertical shaft, and a simple and reliable evaluation method is provided, the defects of large hydrological test error and slow excavation measurement lag in the current evaluation method are overcome, the stratum condition information and guidance are provided for the grouting engineering construction, reliable basis is provided for the grouting engineering acceptance, and technical support is provided for the application of the ground pre-grouting technology of a vertical shaft and the safe and rapid construction of a vertical shaft.

This application relates to the field of gas refining production, specifically disclosing a refining process for high-purity electronic-grade ammonia, comprising the following steps: S1, pretreatment: the raw material liquid ammonia is sequentially vaporized, filtered, and adsorbed to obtain crude ammonia; S2, ultrafiltration: the crude ammonia obtained in step S1 is ultrafiltered under conditions of pressure 0.4-0.8 MPa, temperature 25-45℃, and flow rate 1.5-3.5 m / s to obtain high-purity ammonia; S3, distillation and condensation liquefaction: the high-purity ammonia obtained in step S2 is sequentially distilled and condensed to obtain electronic-grade ammonia with a purity of 5N. The refining process of this application simultaneously meets the requirements of high purity, low cost, and high efficiency, improves the removal efficiency of trace impurities, and can obtain electronic-grade ammonia with a purity of 5N, solving the problems of insufficient purity, high impurity content, and high production costs in existing ammonia refining processes.

The invention relates to a method for preparing lactide with different optical purities, belongs to the technical field of lactide preparation, and discloses a method for preparing lactide with different optical purities through multistage depolymerization, lactic acid oligomer is depolymerized, segmentation is carried out at least twice in the depolymerization process to obtain crude lactide with different m-lactide contents, and optionally, the crude lactide is separated from the crude lactide to obtain the lactide with different optical purities. And respectively purifying crude lactide with different contents of m-lactide. According to the invention, mixing of m-lactide and lactide with optical purity is reduced from the source, and lactide with different optical purity can be obtained as required; the method provided by the invention can obtain gt; according to the present invention, the lactide with the optical purity of 96% does not need the separation of m-lactide and L-lactide, such that the amount of the lactide crude product requiring the separation of m-lactide and L-lactide is substantially reduced, and the separation energy consumption is reduced.

The utility model discloses an engine oil seal vehicle belongs to aero-engine maintenance equipment technical field. Engine oil seal vehicle includes the car body, oil tank, pneumatic pressure boost module, vacuum dehydration module, circulating purification module, oil seal oil injection module, heating temperature control module, pipeline system and control panel. The oil tank is located in the car body, the pneumatic pressure boost module, vacuum dehydration module and circulating purification module are connected the oil tank respectively, one end of oil seal oil injection module is connected the oil tank, and the other end is connected engine oil seal mouth, heating temperature control module is located in the oil tank, and the pipeline system is connected the oil tank, pneumatic pressure boost module, vacuum dehydration module, circulating purification module and oil seal oil injection module respectively to deliver gas and oil, and control panel is located on the car body, and control panel is used for controlling each module operation. The utility model provides engine oil seal vehicle high integration, oil liquid treatment effect is good, and the operation is convenient, is applicable to the in -situ oil seal operation of aircraft to aero-engine fuel system and turbine power generation device.

The invention relates to a continuous purification device for milk soft sweet processing, and relates to the technical field of sugar mixing equipment.The continuous purification device comprises a boiling system, a filtering system, a purification system and a forming device.The boiling system comprises a plurality of boiling units, and the filtering system comprises a filtering and conveying device and a plurality of filtering and collecting devices; the filtering and collecting devices are installed between the corresponding adjacent boiling units, the filtering and conveying device penetrates through the bottoms of the filtering and collecting devices and slides along the bottoms of the filtering and collecting devices, the forming device is installed on the side edge of the boiling system, and the purifying system is located on the side, away from the forming system, of the boiling system. The filtering effect is good and the water loss is fast.

The application discloses a system and method for preparing tetrahydrofuran from 1,4-butanediol. The application proposes a new process for preparing THF by adopting fixed bed solid acid catalysis under low-temperature full liquid phase condition, and combining liquid membrane dehydration. The reaction adopts solid acid low-temperature catalysis cyclization reaction, the THF selectivity can reach more than 99.5%, no n-butyl aldehyde and isobutyl aldehyde impurities are generated, and the equipment corrosion problem caused by the traditional sulfuric acid method is solved. The product 20% water and 80% THF directly enters the liquid membrane dehydration assembly in liquid phase, the water content can be reduced to below 1%, and then THF with water content below 100ppm can be obtained through simple separation dehydration under normal pressure. The total BDO conversion rate of the reaction reaches 100%, the THF selectivity is more than 99.5%, the product purity is greater than 99.9%, and the water content is below 100ppm.

The utility model provides a system for preparing a weighting agent for well drilling from industrial carnallite, and relates to the technical field of industrial waste salt recycling, the system comprises a feeding unit, a storage unit, a multi-stage crushing unit, a vacuum drying unit and a vacuum conveying unit, the storage unit comprises a raw material buffer storage bin and a compound medicament bin; the feeding unit is used for feeding materials to the raw material temporary storage bin, and the compound agent bin is used for containing an anti-caking complexing agent; the multi-stage crushing unit at least comprises a first screw conveyor and a crusher which are arranged in sequence, one end of the first screw conveyor is arranged in the raw material temporary storage bin, and the compound medicament bin is located above the first screw conveyor; the vacuum drying unit comprises a drying machine, and the drying machine is arranged between the first spiral conveyor and the crusher; by means of the device, industrial carnallite generated by offshore drilling can be treated, and the purpose that the industrial carnallite is prepared into the weighting agent for drilling is achieved.

This utility model relates to the field of drainage and dredging, and more particularly to a drainage and dredging device for sponge cities, including a base frame and an installation cylinder; the installation cylinder is fixedly connected to the base frame. A partition plate divides the internal space of the support cylinder into two vertically distributed support spaces. A power component allows the upper and lower support spaces to exchange positions, enabling continuous sludge filtration. This avoids the problem in existing technologies where filtration equipment cannot continuously transport sludge, and the next batch of sludge can only be processed after all the sludge in the filtration equipment has been processed and removed, resulting in low sludge treatment efficiency. Simultaneously, the weight of the sludge in the upper support space after the position exchange continuously compresses the sludge in the lower support space after the position exchange, accelerating the filtration speed of water in the sludge in the lower support space and further reducing the water content in the sludge.

A method of purifying a crude lithium bis(fluorosulfonyl)imide, includes adding a water removal agent to a pretreatment liquid containing the crude lithium bis(fluorosulfonyl)imide to perform a dehydration reaction at a temperature ranging from 20°C to 40°C, reacting the same for an additional 1 h to 6 h after an acid gas stops escaping from the reaction system, and filtering the reaction system to obtain a filtrate; the water removal agent is bismuth trichloride or antimony trichloride. Evaporating and concentrating the filtrate, and recrystallizing the concentrated filtrate are performed to obtain a purified lithium bis(fluorosulfonyl)imide.

The utility model discloses a low energy consumption vinyl chloride water trap, including the separator, the separator is connected with first purifier and waste liquid collection jar through second pipeline and thirteenth pipeline respectively, first purifier is connected with machine front cooler, rectification system and waste liquid collection jar through third pipeline, eleventh pipeline and twelfth pipeline respectively, machine front cooler is connected with machine front separator through fourth pipeline, machine front separator is connected with booster through fifth pipeline, the utility model discloses drying vinyl chloride by adopting temperature swing adsorption technology, reduce the water content among vinyl chloride, and the degree of automation is high, and personnel maintenance quantity is small, and the water molecule separated by temperature swing adsorption is in the form of liquid water and is automatically discharged, and the water is discharged in time, and the water separated by temperature swing adsorption device is neutral, can directly enter the process sewer pipe network, will not cause pipeline and equipment blockage, and the practicality is strong.

This utility model relates to the field of fabric storage technology, specifically disclosing a textile fabric storage rack, including a main body. A rotating door is symmetrically mounted on the surface of the main body, and a cylinder is mounted on the bottom surface of the main body. A moving mechanism is provided inside the main body, comprising: a locking block connected to the end of the output shaft of the cylinder, a support plate connected to the end of the locking block, sliders symmetrically mounted on the end of the support plate, and support blocks symmetrically mounted on the surface of the support plate. A slot is symmetrically embedded in the inner wall of the main body. This textile fabric storage rack, with its moving mechanism, allows fabric to be placed on the surface of the support plate. Simultaneously, the support plate engages with the locking block. At this time, the cylinder pushes the fabric upwards, while the cylinder moves outwards through the locking block. When the locking block engages with the support plate, it causes the support plate to move laterally within the slot, thus placing the support plate and retrieving the fabric.

The utility model discloses a shell type fin heat exchange device for a drying machine, which comprises an outer shell and two fin heat exchangers, the outer shell is respectively provided with an air inlet pipe and an air outlet pipe, and a partition plate is arranged inside the outer shell; according to the device, gas needing to be dried is discharged into the first heat exchange cavity through the gas inlet pipe, the gas is cooled through the fin type heat exchanger in the first heat exchange cavity, water in the gas is cooled and condensed to form water, in this way, the water content of the gas can be reduced, and the gas is discharged through the drainage valve connected with the first heat exchange cavity; and then the cooled gas enters the second heat exchange chamber and is matched with the other fin heat exchanger to heat the gas, and then the gas is exhausted through the gas outlet pipe, so that the gas is dried, meanwhile, in the device, only the fin heat exchanger in the second heat exchange chamber needs to be connected with the compressor, and the other fin heat exchanger does not need to be connected with the condenser; therefore, parts such as a condenser and a fan are reduced, and the cost is reduced.

The utility model discloses a heat dissipation cooling system for a high-temperature mine, which comprises a front-end refrigeration unit, a middle-section refrigeration unit, an air supply pipe, a plurality of groups of cooling units, a liquid supply pipe and a circulating pipe, the front-end refrigeration unit is arranged on the ground surface, the middle-section refrigeration unit is arranged on the middle-rear section of the mine, and the liquid supply pipe is arranged in the middle-rear section of the mine. The cooling units are arranged in mining areas of the rear section of a mine and attached to the inner wall of the mine, the front-end refrigeration unit is sequentially connected with the middle-section refrigeration unit and the cooling units through air supply pipes, and the middle-section refrigeration unit is further connected with a cold source through a liquid supply pipe and a circulating pipe. The device is compact in layout in a mine, small in occupied area, stable in ventilation and high in air quality, the air temperature in the mine is always kept below 30 DEG C, the problem of heat damage can be effectively solved, the production operation environment is improved, and the occupational health of underground mine operation personnel is guaranteed.

The invention relates to the technical field of pharmaceutical preparations, discloses a disintegration performance optimization method for eslicarbazepine acetate tablets, and solves the problems that when an existing eslicarbazepine acetate tablet disintegrant is used, the efficiency is low during timed and quantitative release of drugs and disintegration of drug tablets, the efficient release of the drugs is greatly influenced, and the disintegration performance of the drugs is influenced. And the eslicarbazepine acetate is not easy to absorb by a user. The disintegration efficiency of the medicine tablets can be improved, and efficient dilution of the medicine is greatly improved.

The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a pole piece, the pole piece, a battery and an electric device. The preparation method of the pole piece comprises the following steps: preparing an active layer containing an active substance and a binder on at least one side of a current collector; heating the active layer to heat the surface layer of the active layer to a heating temperature; performing heat preservation treatment on the active layer to enable the surface layer of the active layer to be at a heat preservation temperature; wherein the heating temperature and the heat preservation temperature are independently larger than or equal to the melting point or softening point of the binder and smaller than the decomposition temperature of the binder. By adopting the method to prepare the pole piece, the battery using the pole piece can have good cycle performance.

The invention relates to the technical field of dehydration, and discloses a dehydration device for hazardous waste treatment, the dehydration device comprises a base, the top of the base is fixedly connected with a sleeve seat, the inner wall of the sleeve seat is fixedly connected with a reaction cylinder, and the end surface of one end, far away from the sleeve seat, of the reaction cylinder is fixedly connected with a feed inlet plate; an engine is fixedly connected to the end face of one end, close to the feed inlet plate, of the reaction cylinder, a motor is fixedly connected to the surface of one side, close to the engine, of the sleeve seat, and a discharge hole is fixedly connected to the end face of one end, close to the base, of the reaction cylinder. When the device is used, materials needing to be treated are poured into the device through the feeding port plate, at the moment, in the stirring component, the engine is started, the output shaft is driven to operate, the output shaft can drive the output belt to conduct transmission, and the output belt can drive the inner tooth rotating shaft on the inner wall of the other end to rotate; and the inner surface of the stirring shaft is in collision contact with the stirring stress teeth to drive the stirring stress teeth to operate.

The invention belongs to the field of chemical raw materials, and discloses a method and a system for preparing a low-water-content sodium sulfide / NMP (N-Methyl Pyrrolidone) mixture by dehydrating sodium sulfide and application. The method comprises the following steps: at a target dehydration temperature, continuously adding a sodium sulfide aqueous solution into NMP at a preset flow rate, in the process, removing a part of a material containing water, NMP and hydrogen sulfide from a dehydration kettle, with the addition flow rate of the sodium sulfide aqueous solution being equal to the amount of water removed from the dehydration kettle at the target dehydration temperature; after the sodium sulfide aqueous solution is added, returning materials in the dehydration tower to the dehydration kettle to obtain the low-water-content sodium sulfide / NMP mixture; optionally, the previous steps are repeated. The method provided by the invention has the advantages of high dehydration efficiency, good stability, low water content, small difference between water content and sulfur source content in low-water-content sodium sulfide / NMP mixtures in different batches, and stable quality, and provides good raw material support for obtaining high-quality polyphenylene sulfide, wherein the water / sulfur molar ratio in the dehydrated sodium sulfide / NMP mixture is less than or equal to 1, and the difference between water content and sulfur source content in the low-water-content sodium sulfide / NMP mixtures in different batches is small.

The utility model discloses a device capable of simultaneously separating charcoal and microplastics from soil, which comprises a frame body, a separating tank and a lifting barrel which are connected with each other are arranged on the inner wall of the frame body, a blanking pipe is communicated between the opposite surfaces of the separating tank and the lifting barrel, the upper part of the lifting barrel is fixedly communicated with a return pipe communicated with the separating tank, and the return pipe is communicated with the lifting barrel. A transmission module is mounted on the separation tank, the transmission module is in transmission connection with an inner grinding roller and an outer grinding cylinder, the outer grinding cylinder is rotationally connected with the separation tank, the inner grinding roller and the outer grinding cylinder coaxially and reversely rotate at differential speed, and an annular grinding gap is formed between the opposite surfaces of the inner grinding roller and the outer grinding cylinder. The magnetic biochar and micro-plastic separating device has the advantages that magnetic biochar and micro-plastic can be separated from soil at the same time, when the magnetic biochar and micro-plastic separating device works, firstly, sufficient magnetic adsorption assisting liquid is injected into the separating tank, soil to be separated is injected into the separating tank, and during separation, the servo motor outputs the rotating speed at set power, so that the magnetic biochar and the micro-plastic are separated at the same time. And the spiral magnetic sheet is electrified and generates magnetism.

This application relates to a positive electrode material and a preparation method thereof, a composite positive electrode material, a positive electrode plate, and a secondary battery. The positive electrode material includes: a core, a first shell layer, and a second shell layer. The first shell layer wraps around a surface of the core. The second shell layer wraps around a surface of the first shell layer. The core includes a lithium manganese iron phosphate material. The first shell layer includes a polyanionic positive electrode material. The polyanionic positive electrode material contains no manganese. The second shell layer includes a hydrophobic conductive material. When ensuring a relatively high energy density of the lithium manganese iron phosphate material, the positive electrode material improves the electrical conductivity of the lithium manganese iron phosphate material, alleviates the problem of hygroscopicity, and reduces manganese dissolution during cycling. The positive electrode material achieves relatively high C-rate performance and cycle stability, and contains a low content of water, thereby facilitating subsequent production and use.