788 results about "Aluminum electrolysis" patented technology

The invention relates to the field of capacitor state evaluation, in particular to an aluminum electrolytic capacitor state evaluation method and device based on multi-dimensional data analysis. The method comprises the following steps: performing multi-band excitation on an aluminum electrolytic capacitor, and performing three-dimensional fault distribution reconstruction and structure degradation trend prediction so as to construct an impedance tomography degradation trend prediction map; collecting audio signals in the charging and discharging process of the capacitor, carrying out acoustic texture analysis, carrying out voiceprint-structure degradation correlation mining according to the impedance tomography degradation trend prediction map, and constructing an acoustic texture damage evolution evaluation model; obtaining a thermal imaging image of the capacitor, carrying out local overheating diffusion mining, and constructing a three-dimensional thermal anomaly detection model; performing electrolyte chemical component change tracking and electrolyte degradation situation analysis on the electrolyte of the capacitor, and constructing an electrolyte degradation situation curve; according to the invention, efficient and accurate capacitor state evaluation is realized. The operation reliability and stability of capacitor equipment are improved, and the service life of the equipment is effectively prolonged.

The invention belongs to the technical field of electrode foil formation treatment, and particularly relates to an electrode foil and a preparation method thereof and an aluminum electrolytic capacitor, the preparation method of the electrode foil comprises the steps of performing multi-stage formation treatment on a corrosion foil, the number of stages of the formation treatment is at least two, and the formation treatment at least comprises first-stage formation and second-stage formation, first heat treatment is carried out after the second-stage formation; a formation liquid used in the second-stage formation is a mixed solution containing adipate and monopotassium phosphate. According to the preparation method provided by the invention, the formation liquid used in secondary formation is the mixed solution containing adipate and monopotassium phosphate, the limitation of traditional single formation liquid is broken through, and synchronous optimization of the structure, hydration resistance and electrochemical performance of the aluminum oxide film is realized through multi-stage formation, mixed solution synergy and the synergistic effect of formation and heat treatment; meanwhile, production cost is reduced, and environmental load is relieved.

The invention is suitable for the technical field of electrical measurement and state monitoring, and provides an aluminum electrolysis cell power distribution system regionalization independent blanking control method based on pseudo resistance monitoring, and the method comprises the steps: collecting the anode current and the cell voltage of each measurement point; dividing the plurality of measurement points into a plurality of control areas, and calculating a pseudo resistance value of each control area; screening control areas meeting conditions from all the control areas to form a reference area set; determining an aluminum oxide concentration reference state of each control region in the reference region set through a preset concentration state mapping relation; with the reference region set as a starting point, according to the proximity relation between the control region with the undetermined state and the reference region set in space and the similarity of pseudo resistance values, the aluminum oxide concentration state is propagated to all the control regions through iterative matching; according to the aluminum oxide concentration states of all the control areas, independent discharging control instructions of all the control areas are generated; and the regionalized independent control on the concentration of aluminum oxide in the aluminum electrolysis cell is realized.

The invention discloses an aluminum electrolysis cell multi-area collaborative aluminum oxide concentration balancing method based on dynamic nested control, and relates to the technical field of industrial aluminum electrolysis cells, the method comprises the following steps: dividing an aluminum electrolysis cell into a plurality of areas based on the distribution positions of all feeders in the aluminum electrolysis cell; and respectively determining an area resistance parameter upper limit and an area resistance parameter lower limit of each area, and based on the multiple area resistance parameter upper limits and the multiple area resistance parameter lower limits, carrying out feeding control on the aluminum electrolysis cell by utilizing a dynamic nested control principle. According to the application, a method of dynamically nesting reverse stroke charging in a partial region in a whole tank insufficient-excessive charging stroke is adopted, so that automatic homogenization of alumina concentration distribution in an electrolysis production process region is realized.

The invention belongs to the technical field of aluminum electrolysis, and particularly relates to an electrolytic aluminum oxide concentrated phase conveying solid-gas ratio monitoring system and method, and the system comprises a control system, a material tank system, a compressed air system and a concentrated phase conveying system; the output end of the charging bucket system is connected with the input end of the concentrated phase conveying system; the output end of the compressed air system is connected with the charging bucket system and the concentrated phase conveying system; an air flow meter is mounted on the compressed air system, a weighing sensor is mounted on the charging bucket system, and the control system calculates and controls the solid-gas ratio through the air flow meter and the weighing sensor; the solid-gas ratio is calculated and controlled through the control system, and the working efficiency is improved.

The utility model discloses an aluminum electrolysis anode scrap waste heat utilization device which comprises a trailer, the trailer is provided with a carriage body, a door body is installed on one side of the carriage body, heat preservation materials are laid on the inner wall and the bottom face of the carriage body to form a heat preservation layer, a heat conduction layer is laid on the heat preservation layer on the bottom face of the carriage body, and a plurality of anode scraps and a plurality of new anodes are placed on the heat conduction layer. And the residual poles and the new poles are arranged in a staggered manner. According to the utility model, the new electrode can be preheated by utilizing the residual heat of the residual electrode, and then the preheated new electrode is put into the electrolytic bath for use, so that the heating time and the energy consumption loss of the new electrode in the electrolytic bath can be greatly reduced.

The invention discloses a method for improving the performance of an anode guide rod and related equipment, relates to the technical field of aluminum electrolysis, and mainly aims at solving the problem that the conductivity of the anode guide rod of an existing electrolytic bath is relatively low. The method comprises the steps that the anode guide rod is scanned to construct a three-dimensional model, the three-dimensional model is used for representing protruding points on the surface of the anode guide rod, and the proportion of the protruding points on the surface of the anode guide rod is determined based on the three-dimensional model; and determining a processing strategy of the anode guide rod based on a comparison relationship between the proportion of the protruding points on the surface of the anode guide rod and a preset proportion threshold value. The method is used for the performance improvement process of the anode guide rod.

The invention provides an aluminum electrolysis cell multi-source data fusion acquisition system, and relates to the technical field of electrolytic aluminum. The system comprises a 5G edge computing node and a central control system which are in communication connection, the 5G edge computing node is further electrically connected with field execution equipment, and the 5G edge computing node is deployed in an electrolytic cell field and has a 5G communication module, an embedded computing unit and a multi-interface access capability. The 5G edge computing node comprises a multi-source data acquisition module, a data fusion and preprocessing module and a data uploading and feedback module, the multi-source data acquisition module is electrically connected with a plurality of sensors and cameras on an electrolytic cell, real-time acquisition of multi-dimensional data is realized, timestamps are stamped on various sensor data through a unified time reference, and the data are uploaded to the electrolytic cell through the data uploading and feedback module. And the heterogeneous data is fused based on the timestamp, so that the data acquisition time difference is eliminated, and the data consistency is improved. According to the invention, high frequency, multi-source fusion and low delay can be realized so as to adapt to higher requirements of the industrial Internet of Things on real-time performance and intelligence.

The invention relates to the technical field of electrolytic aluminum monitoring and control, and provides an automatic control method and system for an aluminum electrolysis cell in the electrolytic aluminum process, and the method comprises the steps: A, collecting the operation parameters of the electrolysis cell in real time through a multi-source sensing array; b, constructing a dynamic material balance-heat balance coupling model, and inputting the operating parameters of the electrolytic cell into the dynamic material balance-heat balance coupling model for outputting alumina blanking rate data; c, according to the aluminum oxide blanking rate data change rate, temperature-polar distance cooperative control of the electrolytic cell is synchronously executed, and the optimal polar distance compensation amount is calculated according to the operation parameters; and D, constructing an electrolytic cell resistance change rate prediction model based on the LSTM neural network, and inputting the aluminum oxide blanking rate data change rate into the LSTM neural network structure model for outputting an aluminum oxide concentration compensation strategy. The change condition of the aluminum electrolysis cell in the aluminum electrolysis process can be rapidly and accurately monitored, and real-time control is provided.

The invention particularly relates to an automatic covering agent adding method and system for an electrolytic aluminum workshop crown block. The automatic covering agent adding method comprises the steps that an electrolytic aluminum tank is scanned, segmentation is conducted through a plane segmentation model, so that the surface of electrolytic aluminum liquid and the surface of a first covering agent are obtained, and the surface height of the surface of the electrolytic aluminum liquid is calculated; dividing the whole electrolytic aluminum tank into a plurality of covering areas based on the electrolytic aluminum liquid surface and the first covering agent surface, and obtaining the covering agent demand quantity of each covering area according to the received covering agent thickness threshold value, the surface height and the first covering agent surface; generating a feeding path in the coverage area, and controlling a crown block to drive a rigid material distribution pipe to automatically add a covering agent according to the feeding path and the covering agent demand quantity; and after the covering agent adding procedure in the feeding path is completed, the electrolytic aluminum tank is scanned again to obtain a second covering agent surface.

The invention belongs to the technical field of electrode material preparation, and particularly relates to a preparation method of boric acid-assisted low-temperature sintered porous aluminum foil. The preparation method comprises the following steps: dispersing aluminum powder, boric acid and binder raw materials in a solvent to form dispersed slurry; and coating a matrix with the dispersed slurry, drying, sintering at 450-600 DEG C under protective gas, reacting boric acid with aluminum oxide on the surface of the aluminum powder to form low-melting-point aluminoborate, reducing the sintering temperature, promoting aluminum atom diffusion, increasing sintering neck formation, and sintering to obtain the porous aluminum foil. Boron oxide generated by decomposition of boric acid is added to react with aluminum oxide to form low-melting-point aluminoborate, the sintering liquidus temperature is reduced, aluminum atom diffusion is promoted, and low-temperature sintering at 450-600 DEG C is achieved. The aluminum powder sintered foil is suitable for energy storage devices such as an aluminum electrolytic capacitor and a lithium ion battery, has the advantages of low-temperature energy conservation, high porosity and strong mechanical property, and solves the problems of aluminum oxide obstruction and high high-temperature energy consumption of the traditional aluminum powder sintered foil.

The utility model relates to a clamping type aluminum electrolysis cell anode voltage drop measuring device, which relates to the field of aluminum electrolysis cell anode measurement, and comprises a measuring meter, a clamping assembly for fixing, a first detection part and a second detection part which are arranged on the clamping assembly, and a position control assembly arranged on the clamping assembly. According to the utility model, the first detection part and the second detection part on the clamping assembly are respectively conducted with the upper surface and the lower surface of the anode carbon block, and then the measurement meter is connected and conducted with the first detection part and the second detection part, so that the detection of the voltage drop of the anode carbon block is realized; the tedious operation that a measuring tool and a measuring meter need to be held by a hand for measurement in each time of measurement is omitted, and use is more convenient.

The invention relates to a preparation method of a sintering type aluminum electrolytic capacitor anode foil with controllable carbon content. The preparation method comprises the following steps: mixing aluminum powder, an adhesive, an additive, a composite carbon source and a solvent to obtain aluminum powder slurry; and coating the aluminum powder slurry on a base material to obtain an aluminum foil, and carrying out gradient temperature control sintering. The invention further relates to the carbon-content-controllable sintering type aluminum electrolytic capacitor anode foil prepared through the method. The gradient doping of the carbon source is carried out by compounding the carbon source and gradient temperature control sintering, so that the accurate control of the carbon content is realized, a uniform conductive network is formed, and the reduction of the leakage current and the increase of the mechanical strength are realized.

The invention provides a formed foil and a preparation method thereof. The preparation method of the formed foil comprises the following steps: carrying out pretreatment on an aluminum foil, namely carrying out at least one high-temperature treatment and acid treatment on the aluminum foil; and carrying out multi-stage formation treatment on the pretreated aluminum foil. According to the invention, the hydration resistance of the formed foil can be improved, and the reliability and stability of the aluminum electrolytic capacitor can be improved.

The aluminum electrolysis anode conductive device comprises an aluminum guide rod, the bottom surface of the aluminum guide rod is fixedly connected with square steel, the bottom surface of the square steel is uniformly and fixedly connected with a plurality of steel claws, and the surface of the square steel is fixedly connected with a first aluminum bar and a second aluminum bar; the first aluminum bar is fixedly connected with the side wall face of the aluminum guide rod, and an aluminum strip is fixedly installed between the first aluminum bar and the second aluminum bar. And the section of the aluminum strip is V-shaped. And the first aluminum bar is higher than the second aluminum bar. Steel plates are installed on the surfaces of the first aluminum bar and the second aluminum bar. The utility model has the beneficial effects that the structural design is more reasonable, the processing technology is simple and convenient, the manufacturing cost is saved, the shearing force borne by the aluminum-steel welding surface is reduced, and the service life of the aluminum-steel welding surface is prolonged.

This invention discloses a surface-mount solid aluminum electrolytic capacitor and its manufacturing method, comprising a capacitor core package, which includes N capacitor cores, N+1 conductive metal meshes, a substrate, anode leads, cathode leads, and a silver paste covering tape. The capacitor core package is encapsulated and electroplated to form a solid aluminum electrolytic capacitor. The capacitor core includes an anode portion, a cathode portion, and an insulating barrier tape. In this invention, the conductive metal mesh sandwiched between the metal pads in the anode portion of the capacitor core and the cathode portion of the capacitor core can achieve the flatness of the core package. The silver paste covering tape located on the side of the cathode portion of the core package is embedded in the gap formed between two adjacent capacitor cores due to the conductive metal mesh sandwiched, forming an integrated connection. This prevents the resin encapsulant from being squeezed into the core layers during encapsulation, preventing core deformation damage that could lead to increased leakage current and increased ESR. Furthermore, it can prevent insufficient capacitance or even capacitor failure caused by delamination between cores.

The invention relates to the technical field of power electronic components, and discloses a fast charge-discharge aluminum electrolytic capacitor and a preparation method thereof. The fast charge and discharge aluminum electrolytic capacitor comprises a high-purity aluminum foil subjected to aluminum chloride-hydrochloric acid etching and oxalic acid-tartaric acid oxidation treatment, a porous electrolyte layer with the thickness of 0.015-0.020 mm, a composite organic-inorganic electrolyte and an aluminum shell packaging structure, the preparation method comprises the steps of aluminum foil processing, electrolyte cutting, winding and assembling, vacuum infusion under-0.09 to-0.095 MPa, staged aging charging under the condition of 70-90 DEG C, and finally packaging and forming. According to the method, a compact oxidation film is formed through anodic oxidation, the proportion of gamma-butyrolactone in the electrolyte is optimized, the staged voltage aging and vacuum infusion process is implemented, and the fast charging performance, high-temperature stability and overall reliability of the aluminum electrolytic capacitor are synergistically improved from the material level and the process level.

The invention belongs to the technical field of aluminum electrolysis, and relates to preparation and application of a metal ceramic inert anode material for aluminum electrolysis. The material for the metal ceramic inert anode is formed by compounding a high-entropy alloy phase and a ceramic phase; according to the preparation method disclosed by the invention, the AlCrFeNiV high-entropy alloy and the NiFe2O4 spinel ceramic are compounded to prepare the metal oxide ceramic. The manufacturing method of the metal ceramic inert anode is easy to operate, efficient and beneficial to application and popularization. And in an electrolytic test with the electrolyte being a cryolite-aluminum oxide system at 960 DEG C, good high-temperature conductivity, electrochemical stability, corrosion resistance and thermal shock resistance are achieved.

The invention relates to the technical field of flash fire lifting agents, and discloses a flash fire lifting agent of an electrolyte of a boron-free aluminum electrolytic capacitor and a preparation method of the flash fire lifting agent, and the flash fire lifting agent comprises the following components in percentage by mass: 10-30% of organic ammonium carboxylate; 5%-15% of a nitro compound; 3%-10% of a phosphate ester compound; 2%-8% of a polyethylene glycol derivative; 0.5%-3% of organic siloxane; and the balance of deionized water. Through the synergistic effect of the organic ammonium carboxylate, the nitro compound, the phosphate ester substance and the organosiloxane in a specific proportion, the sparking voltage of the electrolyte is remarkably improved, and the negative effects of boron elements on the environment and the performance of a capacitor are avoided; a nitro compound is used as an electron acceptor to inhibit hydrogen precipitation, and cooperates with phosphate to fill oxide film micropores and block current concentration; the organic siloxane forms a hydrophobic barrier on an electrode interface, electrolyte decomposition is delayed, the organic carboxylic acid ammonium salt accurately controls the free acid concentration, and the conductivity rise caused by hydrogen ion migration is avoided.

The invention belongs to the technical field of electrode materials, and particularly relates to an electrode foil and a preparation method thereof and an aluminum electrolytic capacitor, the preparation method of the electrode foil comprises the step of carrying out soaking pretreatment on a corrosion foil before formation treatment, and the soaking pretreatment adopts a pretreatment solution containing rare earth nitrate. The corrosion foil is subjected to soaking pretreatment by adopting the pretreatment liquid containing the rare earth nitrate before the formation treatment, so that the effects of shortening the formation reaction time, reducing the energy consumption in the formation process, improving the capacity of the formed foil and reducing the leakage current are achieved.

The invention discloses an aluminum anodic oxidation electrolyte for improving the adhesion density of an electrode foil oxidation film, and relates to the technical field of anodic oxidation, the electrolyte comprises 3%-10% of ammonium dihydrogen phosphate, 0.5%-3% of sulfuric acid, 0.01%-0.2% of nano titanium dioxide or nano aluminum oxide, 0.05%-0.5% of an organic buffer agent, and the balance deionized water; the organic buffering agent is used for stabilizing the pH value in a range of 4.5-6.0; nano titanium dioxide or nano aluminum oxide is used as an oxidation film nucleation center to promote directional crystallization of gamma '-Al2O3; the sulfuric acid component improves the conductivity of the electrolyte; ammonium dihydrogen phosphate generates an aluminum phosphate barrier layer on the surface layer of the oxidation film to enhance the waterproof performance of the film layer; according to the electrolyte, the adhesion density and crystallinity of an oxidation film can be remarkably improved, the uniformity and waterproof performance of a film layer are improved, the specific volume stability and the formation efficiency are improved, and the electrolyte is suitable for continuous production of the high-performance aluminum electrolytic capacitor.

The utility model relates to an electricity-saving type aluminum electrolysis anode conductive device which comprises an aluminum guide rod, square steel is fixedly installed on the bottom face of the aluminum guide rod, flat steel is fixedly connected to the side wall face of the square steel, the number of the flat steel is two, the flat steel is arranged on the opposite sides of the square steel respectively and symmetrically arranged along the center line of the aluminum guide rod, and a plurality of steel claws are fixedly installed on the bottom faces of the flat steel arranged on the two sides. The steel claws are evenly distributed on the bottom face of the flat steel, a plurality of shunting aluminum bars are fixedly installed on the surface of the flat steel and evenly distributed on the surface of the flat steel, steel claw shunting pieces and triangular converging pieces are fixedly connected between the shunting aluminum bars, one sides of the triangular converging pieces are fixedly installed on the side walls of the reinforcing aluminum bars, and the reinforcing aluminum bars are arranged on the two sides of the aluminum guide rod respectively. The reinforcing aluminum bars are fixedly connected to the two sides of the aluminum guide rod and are symmetrically arranged along the aluminum guide rod. The device has the advantages of being reasonable in structural design, low in machining and manufacturing cost, easy to machine and manufacture, convenient to operate, good in welding quality, high in strength, capable of prolonging the service life of the whole device, energy-saving and environment-friendly.

The utility model relates to the technical field of aluminum electrolytic capacitors, in particular to a device for automatically detecting side bulging of an aluminum electrolytic capacitor, and solves the problems that in the prior art, the presentation forms of poor side bulging are diversified, and a clear corresponding relation between the poor side bulging and electrical performance parameters is lacked. Therefore, the problem that the defective products are difficult to accurately identify and reject by the existing automatic inspection equipment is solved. The utility model discloses a device for automatically detecting a side drum of an aluminum electrolytic capacitor. The device comprises a pair of detection mold supporting arms, a cylinder I, a detection mold E connected with the cylinder I through a supporting arm, a detection mold F meshed with the detection mold E through a supporting arm gear, simultaneous opening and closing of the detection mold E and the detection mold F, and a material taking system. By removing defective products in time, resource waste and equipment loss caused by continuous processing can be avoided, the production flexibility is enhanced, the blanking detection device can be adjusted and optimized according to different capacitor specifications and production requirements, and the blanking detection device has high adaptability and flexibility.

The invention relates to a production process of a high-stability anhydrous aluminum electrolytic capacitor and the capacitor manufactured by the same, and the capacitor is manufactured by the following method: activating electrolytic paper: activating the surface of the electrolytic paper by adopting an activating agent containing a polyethylene glycol derivative, and removing a solvent to obtain activated electrolytic paper; the activated electrolytic paper, the anode foil, the activated electrolytic paper and the cathode foil are sequentially stacked and wound into a columnar core structure, in the process, the aluminum pad leading-out piece is riveted to the two electrode foils, and an element A is obtained; dipping: dipping the element A in the anhydrous electrolyte, so that the element A is fully dipped in the anhydrous electrolyte to obtain an element B; and assembling: assembling the element B, a shell, a sealing plug and an electronic component to obtain the anhydrous aluminum electrolytic capacitor. Through activating treatment, the adsorption efficiency of the element A on the water-free electrolyte is improved, meanwhile, the phenomenon that under the extreme condition, the capacitance is likely to be reduced can be reduced, and the durability of the element A is improved.

The invention provides equipment and a process for recycling battery-grade lithium carbonate by roasting waste residues of an aluminum electrolysis cell with assistance of aluminum salt, and relates to the technical field of lithium carbonate preparation, the equipment comprises a reaction kettle body, a stirring mechanism, a driving mechanism and a medicament adding mechanism; the stirring mechanism comprises a stirring shaft which is vertically and rotatably connected to the interior of the reaction kettle body, and the stirring mechanism is used for mixing the sodium carbonate precipitant and the filtrate. According to the scheme, a stirring shaft finally drives a driving disc and a shifting plate to rotate anticlockwise, a rotating disc and a convex disc are driven to intermittently rotate clockwise under the cooperation of a driving block and a driven block, and the convex disc intermittently rotates to press a piston rod and a piston downwards through a contact piece, so that a sodium carbonate solution is conveyed to a water dropper through a liquid outlet hose; through intermittent rotation of the convex disc, the sodium carbonate solution is intermittently and slowly dropwise added into the filtrate, the lithium precipitation reaction concentration is accurately controlled, and the phenomenon that the added sodium carbonate solution has instantaneous extremely-high local supersaturation degree in the reaction kettle is avoided.

The utility model relates to the technical field of aluminum electrolysis, and discloses an aluminum electrolysis cell heat balance adjusting device which comprises an aluminum electrolysis cell, a heat flow adjusting device, an air supply pipeline, a frequency conversion fan, a gas circuit control system and a temperature measuring device. The heat flow adjusting device is connected with the variable-frequency fan through an air supply pipeline; the temperature measuring device is arranged on the side wall of the cell shell of the aluminum electrolysis cell and is connected with the gas path control system; the air path control system adjusts the air volume of the frequency conversion fan and the opening degree of the flow valve in the air supply pipeline according to measured data of the temperature measuring device, and the heat dissipating capacity of the side portion of the electrolytic cell shell is controlled in a zoning mode. According to the utility model, the heat flow adjusting device is arranged in the space between the adjacent cradle rib plates, so that the heat dissipating capacity can be adjusted according to the temperature of the side wall of the bath shell; when the device does not operate, external thermal insulation of the side wall of the tank shell can be realized; when the device runs, the heat dissipating capacity of the side wall of the tank shell can be quantitatively adjusted.

The invention belongs to the field of paper for aluminum electrolytic capacitors, and particularly relates to a high-voltage-resistance and high-liquid-absorption composite electrolytic capacitor diaphragm and a preparation method thereof. The diaphragm is formed by compounding at least two layers of high-density base paper, and intermittent point-like bonding is carried out between the base paper through a hydrophilic high-molecular polymer according to the surface coating area of 10-40% and the gluing amount of 0.1-10g / m, so that the pore structure between the paper is reserved while the breakdown voltage is ensured to be increased, the liquid absorption capability is remarkably improved, and the equivalent series resistance (ESR) is reduced. The high-pressure diaphragm solves the problem that pressure resistance and liquid absorption performance of an existing high-pressure diaphragm are difficult to consider, and has the advantages of being simple in structure, excellent in electrical performance, suitable for large-scale production and the like.

The utility model discloses an aluminum electrolytic capacitor, and relates to the technical field of capacitors. The aluminum electrolytic capacitor comprises a shell, a fixing block is arranged on the lower side of the interior of the shell, a core bag is arranged on the upper surface of the fixing block, the diameter of the core bag is smaller than that of the fixing block, a barrel with an opening in the lower end is longitudinally arranged in the shell, and the fixing block can play a role in limiting the lower end of the barrel through the structures such as the fixing block and the barrel; compared with the prior art, the core cladding can be protected through the cooperation of the fixing block and the cylinder, the structure is simple, the structure is convenient to install, the diameter of the core cladding is smaller than the diameter of the fixing block, a gap is reserved between the cylinder and the core cladding, and therefore the core cladding can be prevented from being damaged, and the service life of the core cladding is prolonged. And when the barrel body is extruded and deformed, the core package is not influenced immediately, so that the use of the core package is not influenced under the condition that the barrel body is deformed to a certain degree.

The invention discloses a medium-high voltage formed foil and a preparation method thereof, and an aluminum electrolytic capacitor, and the method comprises the steps: placing a corrosion foil sheet in vacuum plasma equipment, processing for a set time, introducing oxygen or a mixed gas of argon and oxygen into the vacuum plasma equipment, and carrying out the treatment for a set time; transferring the foil from the vacuum plasma equipment into a first organic solvent tank to be soaked for a certain time, wherein the boiling point of a first organic solvent is lower than 60 DEG C; and performing formation treatment. According to the technical scheme provided by the embodiment of the invention, the etched foil is pretreated, and the carbon content of the surface of the etched foil is reduced or cleared through the synergistic effect of physical cracking and chemical cleaning, so that the surface activity and cleanliness of the etched foil are improved. Meanwhile, according to the pretreatment step, carbon residues are thoroughly removed, pollution of impurity decomposition to a formation tank is avoided, the service life of tank liquid is prolonged, and meanwhile the current efficiency in the anodic oxidation process and the uniformity of an oxidation film can be improved through the corroded foil with the high surface activity and cleanliness.

The invention discloses a process method for preparing aluminum fluoride by recovering electrolytic aluminum electrolyte, and relates to the technical field of waste material recovery. The invention relates to a process method for preparing aluminum fluoride by recovering electrolytic aluminum electrolyte. The preparation method comprises the following steps: firstly, grinding the carbon residue or electrolyte into powder, wherein the fineness is greater than 150 meshes; adding water into the powder, pulping, and adding a certain amount of aluminum sulfate or aluminum hydroxide; sulfuric acid is added for leaching under the stirring condition, the leaching temperature ranges from 70 DEG C to 100 DEG C, the leaching time ranges from 2 h to 5 h, and the pH of the leaching end point ranges from 1 to 2; adding water to dilute the filtrate, adding caustic soda flakes to adjust the pH value to 12-14 to remove impurities, and filtering out insoluble hydroxides to obtain a mixed salt solution of sodium fluoride and sodium metaaluminate; adding sulfuric acid into the mixed salt solution while stirring to adjust the pH value to 3-6, and reacting at the temperature of 60-100 DEG C for 2-5 hours to obtain aluminum fluoride slurry; and filtering and washing the slurry to obtain aluminum fluoride trihydrate, and calcining at 500-700 DEG C to obtain anhydrous aluminum fluoride with the purity of more than 95%. The method turns waste into wealth, recycles resources, and is short in process flow, low in cost and high in recovery rate.