353results about How to "Short process" patented technology

This application discloses an acetone sensor based on an ion-conducting copper ion-organic framework and its preparation method, belonging to the field of gas sensor technology. The sensor uses a glass substrate with indium tin oxide (ITO) interdigitated electrodes. The sensitive layer is an ion-conducting copper-based MOF thin film formed by the in-situ coordination reaction of tetrakis(4-aminophenyl)porphyrin and copper ions at the liquid-phase interface, constituting a capacitive gas sensor. In the preparation process, a ligand methanol solution and a copper nitrate solution are first prepared. After plasma cleaning of the substrate, the ligand solution is sprayed onto the copper salt solution interface to form an in-situ film, which is then vacuum dried to obtain the acetone sensor. This application has advantages such as simple process, low cost, high sensitivity, fast response, and good stability, making it suitable for large-scale production. It can be used for non-invasive detection of acetone in diabetic respiration, environmental monitoring, and industrial VOCs detection, showing promising application prospects.

The invention discloses a wet-type large-surface repairing material and a preparation method thereof. The repairing material comprises the following components in percentage by mass: 20-30% of sintered magnesia coarse sand with the particle size of 10-5 mm and the mass percentage of 20-30%; the particle size of the sintered magnesia fine sand is 5-3mm, and the mass percent of the sintered magnesia fine sand is 5-15wt%; the grain size of the forsterite is 3-1 mm, and the mass percentage of the forsterite is 15-25 wt%; the particle size of the medium-grade magnesia is not greater than 2mm, and the mass percent is 15-25wt%; the particle size of the medium-grade magnesia fine powder is 150-200 meshes, the mass percent of the medium-grade magnesia fine powder is 10-15 wt%, the particle size of the magnesium-calcium-iron sand fine powder is 150-200 meshes, and the mass percent of the magnesium-calcium-iron sand fine powder is 1-8 wt%; 10 to 14 wt% of modified asphalt; and 0.5 to 1.5 wt% of industrial white oil. The repairing material disclosed by the invention is low in cost, environment-friendly and economical, has relatively high breaking strength, and is particularly suitable for a large-surface repairing material of a schreyerite steelmaking converter.

The invention discloses a method for selectively separating valuable metals from a positive electrode material of a waste lithium battery, and belongs to the technical field of resource recycling of waste lithium ion batteries. The method comprises the following steps: preparing an aprotic deep eutectic solvent (DES) as a leaching agent and an electrolyte at the same time; the method comprises the following steps: adding a waste positive electrode material into DES, and leaching to obtain a DES leaching-electrolyte system; according to the method, the pulse voltage is applied in stages, selective separation of nickel, cobalt and manganese is achieved by controlling the pulse peak voltage (the first stage is-0.8 V to-1.0 V, the second stage is-1.0 V to-1.2 V, and the third stage is-1.2 V to-1.5 V), and the pulse frequency and the duty ratio are used for regulating and enhancing mass transfer and restraining side reactions. According to the method, the metal deposition potential difference is expanded through DES coordination regulation and control, efficient selective separation of nickel, cobalt and manganese is achieved in combination with pulse step-by-step voltage control, and the method has the advantages of being high in separation efficiency, few in side reaction, simplified in process, high in product purity and the like.

The invention discloses a method for deeply recovering phosphorus and vanadium from molten iron containing phosphorus and vanadium, which comprises the following steps: treating the molten iron containing phosphorus and vanadium by adopting an oxygen blowing method, in the oxygen blowing method, directly blowing mixed gas into the molten iron by utilizing a spray gun, the volume concentration of the oxidizing gas is 18%-50%. The method has the advantages of improving the recovery rate of phosphorus and vanadium, reducing the smoke amount and the like, and also has the characteristics of low cost, short process, environmental friendliness, less carbon emission, high heat utilization rate, full utilization of resources and the like.

A kind of processing method of metal piece with closed flow channel, the metal piece includes cylinder, and the peripheral wall of the metal piece is internally provided with circumferentially extending flow channel, it is characterized in that, sequentially include the following steps: step one, process annular cover;Step two, print out the blank in cylinder using additive manufacturing technology;Step three, annular groove is milled on the upper end surface of the blank, the mouth of the groove is upward, and at least partially compatible with annular cover;Step four, the annular cover obtained in step one is welded to the blank obtained in step three to close the mouth of the groove.The processing method of metal piece with closed flow channel involved in the present application makes the overall strength of the processed metal piece higher, and the process flow is shorter.

This invention provides a QPQ surface strengthening method for flexible and rigid wheels in harmonic reducers, comprising the following steps: after machining the flexible or rigid wheel, it is sequentially degreased, cleaned, dried, and preheated; the preheated flexible or rigid wheel is nitrided to form a nitrided layer on its surface; the surface of the flexible or rigid wheel is treated mechanically or by tumbling; the polished flexible or rigid wheel is placed in molten oxide salt for oxidation treatment to form an oxide layer on the surface of the nitrided layer; after the oxidized flexible or rigid wheel is air-cooled, it is immediately rinsed with clean water and dried with hot air, and then coated with anti-rust oil. Compared with the prior art, this invention uses low-temperature salt bath nitriding and oxidation treatment, the QPQ process is short, has fewer process steps and is easy to control, and the salt bath can be recycled. The surface hardness of the workpiece reaches 800-850 HV, and the wear rate is reduced by more than 70% compared with the traditional tempering process, significantly extending the service life of the workpiece.

This invention discloses a method for purifying metallic selenium through continuous multi-stage vacuum distillation: S1: Crude selenium powder is placed in a graphite crucible, the temperature of the crucible heater is set to 350-500℃, the temperature of the temperature-controlled heater is set to 250-350℃, and the vacuum degree of the distillation apparatus is controlled to 0.1-10 Pa for first-stage vacuum distillation; S2: The temperature of the crucible heater is set to 200-300℃, the temperature of the temperature-controlled heater is set to 600-900℃, and the vacuum degree of the distillation apparatus is controlled to 0.1-10 Pa for second-stage vacuum distillation. This invention, by selecting and controlling the temperatures of the crucible heater and the temperature-controlled heater during the purification process, enables continuous multi-stage vacuum distillation to purify metallic selenium. This avoids the need for multiple heating and cooling cycles and multiple material handling processes required in traditional methods, reducing energy consumption and pollution caused during handling. The process steps are simple, and the overall process time is significantly shortened.

The present disclosure relates to a data transmission method, device, equipment and storage medium, the method comprising: obtaining attribute information of a target service in a service cluster, the service type of the target service being a node port type, the attribute information comprising identification information and port information; sending the attribute information of the target service to a control plane, so that the control plane generates configuration information based on the attribute information, and sends the configuration information to a service mesh, the configuration information being used to cause the service mesh to configure an address translator after receiving the configuration information, so that the address translator forwards a target data packet sent by an external device when accessing the target service to the service mesh. The present disclosure configures the address translator by collecting the information of the node port service, so that the data packet sent by the external device reaches the cluster inside without passing through the gateway server, shortens the processing flow, and reduces the data transmission delay.

A catalyst for the direct synthesis of acetic acid and ethanol from CO2 via a non-hydrogenation route, its preparation method, and its application are disclosed. This invention belongs to the field of catalyst technology and overcomes the shortcomings of existing acetic acid synthesis technologies. The solution involves using TiO2 nanotubes as the catalyst support, and the active component being a single metal Co or Pd, or a bimetallic composition of Co and Pd, with a loading of 3-7%. wt The catalyst is prepared by first using a hydrothermal method to prepare TiO2 nanotubes, and then using the TiO2 nanotubes as a carrier, impregnating, drying, and calcining to obtain the catalyst. When applied to a dual-channel fixed-bed step-by-step continuous reactor, the catalyst enables the one-step conversion of CO2 to ethanol and acetic acid via a non-hydrogenation route at low temperature and atmospheric pressure, avoiding the problem of insufficient hydrogen source in the CO2 hydrogenation route. The process of this invention is short, the conditions are mild, it does not require a high-energy-consuming syngas production step, the product composition is simple, and the subsequent separation energy consumption is low.

The invention relates to a fly ash-based hierarchical pore molecular sieve composite material as well as a preparation method and application thereof, and belongs to the technical field of molecular sieve composite materials. In order to solve the problems that an existing fly ash based molecular sieve is single in pore structure, can only adsorb single pollutants and is complex in preparation process, the invention provides a preparation method of a fly ash based hierarchical pore molecular sieve composite material. The method comprises the following steps: carrying out mechanical-chemical coupling activation on fly ash, carrying out alkali fusion activation treatment, preparing a colloidal precursor, carrying out hydrothermal crystallization treatment, carrying out post-treatment on a crystallized product, and carrying out metal ion modification treatment. A micropore-mesopore-macropore three-level pore channel is constructed, the mass transfer efficiency and the adsorption activity are improved, double active sites are formed through metal modification, heavy metal and CO2 can be synchronously adsorbed, and the CO2 capacity is improved by 10-15% through heavy metal loading. The one-step method is adopted for preparation, the process is simplified, the cost is low, high consumption of fly ash is achieved, and the benefits of solid waste recycling and multi-pollutant cooperative treatment are achieved.

The utility model discloses an ozone and plasma compound cleaning machine, including casing, door body I, door body II, gas flowmeter, pressure gauge, ozone cleaning cavity, UV lamp assembly, cleaning platform subassembly, vacuum cavity, vacuum pump and air inlet subassembly. The casing is installed with door body I and door body II, is communicated with the ozone cleaning cavity and vacuum cavity that sets up respectively in the casing inside. The ozone cleaning cavity is provided with UV lamp assembly and cleaning platform subassembly. Vacuum cavity is provided with anode plate assembly. In the working condition, the article to be cleaned is placed on the bottom surface of the cleaning platform or vacuum cavity, and the article to be cleaned is cleaned through UV lamp or ion body. The utility model will be through the integration of ozone generation module and plasma generation module, adopt integrated cavity design, and the cleaning efficiency is high, effectively shortens technological process, avoids secondary pollution caused by intermediate transfer.

The utility model discloses a kind of magnetic levitation laminating equipment, including the pole piece unwinding module for unwinding first pole piece material tape and second pole piece material tape, the die cutting module for the die cutting of the first pole piece material tape and the second pole piece material tape into first pole piece and second pole piece, the pole piece conveying module for conveying the first pole piece and the second pole piece, diaphragm unwinding module, magnetic levitation module, laminating table module, and laminating blanking module, magnetic levitation module includes the magnetic levitation clamp that runs along its annular magnetic levitation track, the magnetic levitation clamp obtains and clamps the diaphragm fixed in first preset position, the magnetic levitation clamp obtains and clamps the first pole piece and the second pole piece in second preset position, and the diaphragm is located between the first pole piece with the second pole piece to form pole piece laminated layer. In the magnetic levitation laminating equipment of the utility model, the conveying mode of laminating is relatively more simple, shortens the process of Z-shaped laminating technology, improves laminating efficiency.

This invention discloses a method for preparing nickel-cobalt-manganese lithium oxide batteries from retired lithium cobalt oxide and lithium manganese oxide battery cathode materials. (1) After pretreatment processes such as discharge, disassembly, crushing, and sieving, retired lithium cobalt oxide and lithium manganese oxide batteries are obtained as cathode materials respectively. (2) The two cathode materials are mixed with NiSO4·7H2O and NiCO3 in a certain proportion and then calcined at high temperature for a period of time. (3) The calcined product obtained in the second step is thoroughly ground and then leached with deionized water to obtain lithium sulfate leachate and ternary precursor (leaching residue). (4) The lithium sulfate leachate is evaporated and concentrated, sodium hydroxide is added to adjust the pH, and then sodium carbonate is added for precipitation to obtain lithium carbonate product. This invention has the characteristics of simple process, green environmental protection and high utilization efficiency. It combines resource recycling with high-performance material regeneration and provides a sustainable solution for the recycling of waste lithium-ion battery cathode materials.

The application provides a method and equipment for purifying battery-grade lithium carbonate by dilute acid leaching of magnetic-removing lithium carbonate, and relates to the technical field of lithium carbonate purification, and comprises the following steps: step S1, slurry treatment: mixing battery-grade magnetic-removing lithium carbonate with deionized water and uniformly stirring to obtain a slurry; step S2, mild leaching: adding dilute acid to the slurry and stirring to leach under mild conditions to remove magnetic metal impurities; and step S3, neutralization and recrystallization: quickly adding a neutralizing agent to the leached slurry, adjusting the pH of the slurry, stirring to react, and recrystallizing the trace dissolved lithium carbonate. The scheme finally realizes the mild leaching process without carbonization, avoids the massive dissolution of the main body of lithium carbonate, selectively removes only the magnetic impurities, combines the rapid neutralization and recrystallization, makes the lithium carbonate re-precipitate, the purity of the finished product can reach the high-purity battery-grade standard, the content of magnetic impurities is extremely low, the lithium loss is extremely small in the whole process, the total lithium carbonate yield is extremely high in combination with the mother liquor membrane method.

The present application relates to the technical field of cable processing, and discloses a cable coating device and a coating method. The device is used for coating the ground wire on the cable to be processed, and comprises a coating furnace, a cable carrier and a coating module. The coating furnace contains coating. The cable to be processed is detachably installed on the cable carrier. The coating module comprises at least one coating spoon provided with a containing groove for containing the coating. The coating spoon can move between a coating position and a replenishment position. When the coating spoon is at the replenishment position, it extends into the coating furnace. When the coating spoon is at the coating position, the top of the containing groove is located in a working plane parallel to the horizontal plane, and the ground wire on the cable to be processed located in the working plane is immersed in the coating contained in the containing groove. The design that the top of the containing groove is flush with the ground wire enables the ground wire to contact the coating higher than the top of the containing groove, so as to realize the coating operation of the ground wire in the horizontal plane and improve the coating efficiency.

The application provides a preparation method of high-quality magnesium oxide and belongs to the technical field of magnesium metal oxide synthesis. The application uses magnesium hydroxide waste produced in an ethyl maltol process as raw material, and obtains magnesium oxide through sodium hypochlorite oxidation, twice water washing and calcination. The obtained magnesium oxide has high purity and high activity. The process flow of the application is short, the calcination temperature is low, the side reaction is less, the subsequent equipment investment is less, the price of sodium hypochlorite is relatively low, the cost is saved, new impurities are not introduced, and the application has good industrial application value.

The application discloses a method for promoting olivine to reduce nitrate to generate ammonium bicarbonate by using carbon dioxide, and belongs to the technical field of environmental chemical industry, mineral resource utilization and fertilizer preparation. The method mixes olivine and a nitrate-containing aqueous solution to form a reaction system, and carbon dioxide is introduced from the beginning of the reaction, so that the carbon dioxide promotes the release of Fe(II) / Mg active components in the olivine, and is coupled with ammonia / ammonium generated in situ to form an ammonium bicarbonate system. After the above reaction is completed, the ammonium bicarbonate fertilizer solution, slurry or crystal product is directly obtained in the same reactor by cooling, so that an independent ammonia absorption or ammonium bicarbonate synthesis section is not needed. The method can realize the resource utilization of nitrate, the utilization of carbon dioxide and the preparation of nitrogen fertilizer products simultaneously, has a short process, simple equipment, and is suitable for nitrate wastewater treatment, low-carbon fertilizer preparation and carbon-nitrogen collaborative resource utilization.

A disinfection system for generating direct plasma at sub-atmospheric pressure to treat an inner surface of a channel of a surgical instrument and a method thereof. The method provides: inserting the surgical instrument into an airsealable housing; positioning an elongate discharge electrode within the channel such that the elongate discharge electrode coaxially spans at least a majority of the length of the channel to define an annular ignition region within the channel; electrically coupling a collector with a conductive boundary sleeve of the surgical instrument; the air-sealable shell is airtight; reducing the pressure of the annular ignition region containing ambient air to sub-atmospheric pressure; and electrically igniting the ambient air of the annular ignition region of the channel by applying a potential difference to produce a longitudinal plasma cloud for sufficient disinfection.

The present application relates to the fast milling processing method of the complex structure and shape section parts of the airplane, and belongs to the field of aviation sheet metal forming technology. The present application solves the one-time processing of the appearance milling and drilling of the traditional complex cross-section shape and different size section parts, discards the drilling precision ensured by the drilling jig for the hole making of the section part, improves the surface quality of the section part, improves the manufacturing precision of the appearance, notch, bevel and hole, improves the processing efficiency, completes a set of tooling capable of processing different specifications of section parts through the pneumatic universal drilling and milling jig, realizes the efficient and accurate manufacturing of the section part, realizes the group milling of the workpiece, and further reduces the raw material cost, tooling manufacturing cost and shortens the process flow.

This application relates to the field of solid waste resource utilization technology, specifically disclosing a method for synthesizing lithium iron phosphate based on sludge incineration ash through electrocoagulation-lithiation. The method involves leaching sludge incineration ash with dilute sulfuric acid to obtain a phosphate-containing acid leachate, followed by purification with a cation exchange resin to remove multivalent metal impurities. Using the purified phosphate solution as the base electrolyte, a lithium source, electrolyte, and organic carbon source are added, and the pH is adjusted. An iron plate is used as the anode and an inert electrode as the cathode for electrocoagulation. Fe²⁺ dissolved at the anode co-precipitates with PO₄³⁻ and Li⁺ in the solution to form a LiFePO₄ precursor slurry. Finally, solid-liquid separation, washing, drying, and programmed temperature sintering are performed to obtain a carbon-coated lithium iron phosphate composite material. This application has the advantage of achieving high-value utilization of sludge incineration ash.

This invention provides a method for preparing mesitylene, comprising the following steps: reacting C9 aromatics with methanol in the presence of a catalyst to obtain mesitylene; wherein the reaction temperature is 350–420°C, the reaction pressure is 0.5–5.0 MPa, the molar ratio of methanol to C9 aromatics is 1:1–7:1, and the catalyst is a modified HZSM-5 molecular sieve. In this method for preparing mesitylene, C9 aromatics directly participate in the reaction without separation, resulting in high production efficiency, a short process, and low cost.

According to the liquid cooling system for the data center provided by the utility model, Freon is adopted as a heat exchange medium of the liquid cooling system, and a mechanical compression refrigeration direct expansion type air conditioning system (fluorine pump system) is combined with the liquid cooling system, so that the unification of an air cooling part and a liquid cooling part is realized, the pipeline is simple, the manufacturing cost is low, and the overall operation efficiency and the maintenance convenience are higher. The system has good expansibility and can be flexibly adjusted according to the outdoor temperature or the tail end load condition, and the refrigerating capacity of the cold source is correspondingly increased or reduced. The compressor is not directly connected with the evaporator and the CDU plate heat exchanger, but indirectly exchanges heat through the plate heat exchanger, so that the flow of a mechanical compression refrigeration loop is reduced, lubricating oil of the compressor is not easy to accumulate in the condenser I and the loop, the problem of unsmooth oil return of the compressor is avoided, and the service life of the compressor is prolonged. And the design support system is connected in parallel with the expansion mechanical refrigeration module, and the cold source can be flexibly adjusted according to the tail end load.

The invention provides a sulfide-halide composite solid electrolyte, a preparation method thereof and a solid-state battery. The method comprises the following steps: mixing and ball-milling a sulfide electrolyte, a halide electrolyte, a dopant and an interface modifier under the protection of inert gas to obtain composite electrolyte powder; carrying out tabletting molding on the composite electrolyte powder under the protection of inert gas to obtain a composite solid electrolyte sheet; and carrying out annealing treatment on the composite solid electrolyte sheet under the protection of inert gas to obtain the sulfide-halide composite solid electrolyte. The sulfide-halide composite solid electrolyte disclosed by the invention can realize synergistic improvement of various properties, has high room-temperature ionic conductivity and a wide electrochemical stability window, is improved in air stability and is good in mechanical property.

The invention relates to a titanium silicalite molecular sieve and a preparation method and application thereof, the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, carrying out first molding, and carrying out first roasting treatment on a solid product obtained by the first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; s4, carrying out secondary roasting treatment on the titanium silicalite molecular sieve pre-product; the mode of the first-time forming is extrusion forming. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has higher mechanical strength and larger specific surface area, and when the titanium silicalite molecular sieve is used for a reaction for preparing epoxypropane, higher epoxypropane selectivity and yield can be obtained.

The invention discloses a film-forming devolatilization device which is characterized by comprising a shell, a devolatilization cavity for materials to pass through is formed in the shell, at least two rotatable stirring shafts are arranged in the devolatilization cavity side by side, and each stirring shaft is close to the adjacent stirring shaft. The film-forming devolatilization device has the beneficial effects that the rotatable stirring shaft is arranged in the shell, so that a material is lifted by the stirring shaft to form a thin material film, the evaporation area of the material is increased, small molecular substances contained in the material are sufficiently devolatilized, and the material treated by the film-forming devolatilization device can be directly subjected to spinning or subsequent production processing; therefore, the process flow is shortened, the production energy consumption is reduced, and the method is environment-friendly; in addition, the multiple stirring shafts are arranged side by side, the evaporation area of the materials is further increased, the adjacent stirring shafts can be matched with each other to scrape the materials in the operation process of the film forming and devolatilization device, and the film forming and devolatilization device has good material surface updating and self-cleaning capacity.

This invention belongs to the field of polyolefin preparation and relates to a method for preparing a polyolefin material with low metal impurities and resistance to precipitation. The method includes the following steps: (1) adding polyolefin resin raw material and fatty ketone solvent into the extraction vessel of a supercritical extraction device, introducing a gaseous medium into the extraction vessel, adjusting the temperature and pressure of the extraction vessel to make the gaseous medium be in a supercritical state, and treating the polyolefin resin raw material in a supercritical fluid; the fatty ketone solvent is C3-C 10 (1) At least one of the fatty ketone solvents; (2) Cooling and depressurizing to separate the polyolefin resin raw material from the solvent phase and drying it to obtain the polyolefin material with low metal impurities and resistance to precipitation. The method provided by the present invention has high efficiency in removing metal impurities from polyolefins and simultaneously achieves the removal and control of the content of soluble polymers, which significantly improves the purity and precipitation resistance of polyolefin resins.

This invention provides a fiber-based biomimetic polyurethane artificial blood vessel and its preparation method. The method involves using wet spinning technology to obtain filaments, which are then drawn and wound onto the surface of a metal tube to form a polyurethane fiber inner layer. A fabric middle layer is woven onto the surface of the polyurethane fiber inner layer. An organic solvent is sprayed onto the surface of the fabric middle layer, and an outer polyurethane fiber layer is prepared on the fabric surface using electrospinning technology. Finally, after curing and demolding, the fiber-based biomimetic polyurethane artificial blood vessel is obtained. This invention combines wet spinning, weaving, and electrospinning technologies to achieve integrated preparation of polyurethane artificial blood vessels. The resulting artificial blood vessel is of high quality, with a tightly bonded three-layer fiber-based structure that maximally mimics the three-layer structure of natural blood vessels. The inner layer provides excellent compliance, the fabric layer increases the blood vessel's impermeability and sutureability, and the outer layer effectively prevents vascular delamination and promotes endothelialization. Furthermore, the preparation method is environmentally friendly and pollution-free, with a short process flow, making it suitable for continuous industrial production.

This invention discloses a devolatilization process for high melt flow index and high transparency lithium-based polymer solutions. The process employs falling film evaporation for initial evaporation, followed by deep devolatilization using a twin-screw extruder, with the volatile solvent being condensed and recovered. The devolatilized polymer melt is then extruded by a screw extruder, pelletized by an underwater pelletizer, and dehydrated by a centrifugal dewatering machine to obtain finished polymer granules. This method can be used for the devolatilization of high melt flow index, high transparency, and low water content lithium-based polymer solutions, and the resulting polymer volatile content is ≤0.5% (mass fraction). The granules or cobblestone-like particles are easy for downstream processing applications. This process is simple, low-cost, can be manufactured using existing mature equipment and processes, and is easy to control and industrialize.

This invention discloses a method for preparing electronic-grade hydrofluoric acid for semiconductors, comprising the following steps: a. Liquid anhydrous hydrogen fluoride raw material is preheated and vaporized. After vaporization, the hydrogen fluoride passes sequentially through a primary sodium fluoride adsorption column and a secondary sodium fluoride adsorption column, causing some sodium fluoride to be converted into sodium hydrogen fluoride. The unadsorbed tail gas is absorbed by sodium hydroxide alkaline solution; b. The sodium fluoride adsorption column undergoes a first-stage heating process to desorb free water and silicon tetrafluoride gas, and is held at this temperature for 1 hour. The desorbed gas enters the tail gas absorption; c. The sodium fluoride adsorption column is further heated for a second-stage desorption of hydrogen fluoride, and held at this temperature for 1 hour, causing sodium hydrogen fluoride to decompose into high-temperature hydrogen fluoride gas; d. The high-temperature hydrogen fluoride gas from step c is absorbed and prepared with ultrapure water to form crude hydrofluoric acid, which is then filtered through a membrane to obtain electronic-grade hydrofluoric acid for semiconductors. This invention features a short production process, low energy consumption, and recyclable adsorption materials. Compared with traditional processes, it has lower production costs, better quality, and significant economic benefits.

The invention relates to the technical field of aerogel, and provides a super-hydrophobic flexible aerogel heat insulation film as well as a preparation method and application thereof. The aerogel film comprises aerogel particles subjected to hydrophobic modification treatment and an in-situ fiberized fiber binder, the aerogel particles subjected to hydrophobic modification treatment are wound and anchored by a three-dimensional network structure formed by the in-situ fiberized fiber binder. The aerogel particles subjected to hydrophobic modification treatment and the fiber binder are used as raw materials, a specific process is adopted for processing, a fiber three-dimensional network anchored aerogel particle composite structure is constructed, the problem of aerogel brittleness and the process problem of uniform fibrosis of the fiber binder are solved, and the fiber three-dimensional network anchored aerogel particle composite structure is obtained. The preparation of the aerogel film with excellent comprehensive performance is realized.