146 results about "Aluminum fluoride" patented technology

The invention discloses a passive radiation refrigeration coating and a preparation method thereof, and relates to the technical field of industrial coatings. Comprising a fluoroacrylate emulsion, hollow glass beads, nano titanium dioxide, flaky silicon dioxide aerogel powder, polytetrafluoroethylene micro powder, hydroxyl-terminated polydimethylsiloxane, a hydroxyl acrylic acid modified silane coupling agent, a super-hydrophobic modified fluorosilicone surface additive, nano cerium oxide, aluminum fluoride doped zinc oxide infrared enhancement powder and deionized water. The paint is prepared on the basis of the formula. According to the invention, a multi-scale spectrum regulation and control and surface self-cleaning system is constructed cooperatively, so that the synergistic effect of high reflection of a sunlight region and high emission of a middle infrared region is realized. The coating can maintain continuous passive refrigeration in a day and night period, the surface of the coating has self-cleaning capability and excellent ultraviolet aging resistance, and high reflectivity and high radiation emissivity can be maintained for a long time in a complex outdoor environment, so that the thermal management efficiency of buildings and equipment is remarkably improved.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention discloses an atomic layer deposition method and structure for an aluminum fluoride enhanced aluminum oxide passivation layer of a TOPCon solar cell. The method comprises the steps that after a boron-doped layer is formed on the front face of a crystal silicon wafer, a passivation layer is formed on the boron-doped layer through an atomic layer deposition technology, specifically, Al2O3 deposition circulation is conducted with trimethyl aluminum as an aluminum source and H2O as an oxygen source, AlF3 deposition circulation with aluminum chloride as the aluminum source and HF or NH4F as a fluorine source is periodically inserted, the proportion of the number of deposition circulation times of AlF3 to the number of deposition circulation times of Al2O3 is 1: (1-10), and the passivation layer is formed on the boron-doped layer through the atomic layer deposition technology. And an alternating layer structure with the total thickness of 5-10 nm is formed. According to the invention, an AlF3 layer is periodically inserted in an Al2O3 deposition cycle, so that an Al2O3 / AlF3 superlattice structure is formed. According to the structure, the interface passivation effect is remarkably improved, hydrogen atom overflow is reduced, and the ultraviolet aging resistance is enhanced. The method is compatible with an existing ALD production line, is suitable for high-efficiency TOPCon battery manufacturing, and has a good industrial application prospect.

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

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.

The invention relates to the field of aluminum electrolysis industrial solid waste resource recycling, in particular to a method for preparing regenerated aluminum fluoride from aluminum electrolysis fluorine-containing solid waste. The method comprises the following steps: crushing and grinding the fluorine-containing solid waste, and mixing the crushed and ground fluorine-containing solid waste with anhydrous aluminum sulfate, aluminum fluoride seed crystals and a carbonaceous additive; carrying out heating reaction on the mixture at 500-700 DEG C, washing with water, and filtering; and drying the filter cake to obtain a regenerated aluminum fluoride product. According to the method, the aluminum fluoride seed crystal is introduced to promote reaction conversion, the calcium sulfate byproduct is subjected to in-situ reduction removal by using the carbon additive, and the sodium is deeply removed through heat treatment and high-temperature distillation, so that the obtained regenerated aluminum fluoride product is high in purity and low in sodium and sulfur content, and can be directly reused in an electrolytic cell. According to the technical scheme, high-value utilization of the aluminum electrolysis fluorine-containing solid waste is achieved, and environmental and economic benefits are achieved.

The application provides a tantalum-based alloy and a preparation method thereof. The preparation method of the tantalum-based alloy comprises the following steps: sequentially laying a first mixed material, a second mixed material and magnesium chips in a reaction crucible in a top-down direction, igniting the reaction crucible to generate an aluminothermic reduction reaction, and then sequentially performing a temperature reduction treatment and a surface finishing treatment to obtain the tantalum-based alloy. The first mixed material comprises aluminum particles, tantalum pentoxide, titanium oxide, potassium chlorate and aluminum fluoride. The second mixed material comprises aluminum particles, tantalum pentoxide, titanium oxide, potassium chlorate, aluminum fluoride and calcium fluoride. By adopting double dosing and covering the magnesium chips with the upper material, the application improves the ignition efficiency, significantly improves the material loss caused by the slow ignition speed and insufficient ignition of the material in the traditional off-oven method, and introduces a titanium source to form an AlTaTi compound, thereby significantly enhancing the alloy uniformity.

The utility model discloses an aluminum fluoride crystal growing device which comprises a crystallizing tank and a stirring part, the stirring part is arranged in the crystallizing tank and provided with a rotating shaft rotationally arranged in the crystallizing tank, a fixed transmission rod is rotationally arranged in the rotating shaft, a supporting frame is fixedly arranged at the top of the crystallizing tank, and the supporting frame is fixedly connected with the crystallizing tank. The bottom of the supporting frame is fixedly connected with the top of the fixed transmission rod, a plurality of stirring rods are rotationally arranged on the outer side of the rotating shaft and meshed with the fixed transmission rod, and the rotating shaft rotates to drive the stirring rods to revolve around the fixed transmission rod so as to drive the stirring rods to rotate. By arranging the crystallizing tank and the stirring part, when aluminum fluoride mother liquor is stirred, the stirring rod rotationally arranged on the side surface of the rotating shaft is driven to revolve around the fixed transmission rod through the rotation of the rotating shaft, so that the fixed transmission rod drives the stirring rod to rotate, and a plurality of stirring centers are formed in the crystallizing tank; and the efficiency of separating out aluminum fluoride crystals from the aluminum fluoride mother liquor is improved.

This invention provides a high-selectivity dry etching method for surface convergence before p-GaN regrowth, comprising: etching the surface of the p-GaN layer or GaN layer of a GaN / AlGaN heterojunction in a Cl-based gas atmosphere to remove the native oxide layer and contaminants; introducing a mixture of BCl3 and fluorine-containing gas into a reaction chamber under inductively coupled plasma conditions, and maintaining the self-bias voltage within a first preset range for etching to selectively remove the p-GaN layer or GaN layer and achieve near-stop etching in the AlGaN layer, wherein the fluorine-containing gas is used to form an aluminum fluoride layer on the surface of the AlGaN layer to inhibit etching; and reducing the self-bias voltage from the first preset range to a second preset range and / or reducing the proportion of fluorine-containing gas in the mixed gas under plasma conditions to perform convergence treatment on the surface of the near-stop etched structure. This improves the repeatability of the process window and the adaptability of the regeneration length.

The utility model relates to the technical field of conveying mechanisms, in particular to an aluminum fluoride conveying mechanism which comprises a conveying cylinder, a rotating pipe is rotationally connected to the side face of the inner wall of the conveying cylinder, an auger blade is fixedly connected to the outer side of the rotating pipe, the inner side of the auger blade is hollow, the rotating pipe penetrates through the conveying cylinder, and the conveying cylinder is fixedly connected with the rotating pipe. An internal cooling assembly is arranged on the outer side of the conveying cylinder; the internal cooling assembly comprises a first circulating cooling pump fixedly connected with the outer side of the conveying cylinder, and the output end of the first circulating cooling pump is fixedly connected with a first liquid conveying pipe. According to the raw material cooling device, due to the fact that the internal cooling assembly is arranged, raw materials can be conveniently cooled from the inside in the raw material conveying process, the contact area of the auger blades and the raw materials is increased in the rotating process, the cooling efficiency is improved, due to the fact that the threaded cooling holes are formed, the raw materials can be cooled from the outside, and the cooling efficiency is improved. And the cooling effect of the raw materials is better.

The present application relates to a method for reducing the content of sulfur in aluminum fluoride, which comprises the following steps: uniformly mixing crude aluminum fluoride powder containing sulfate impurities with ammonium hydrogen fluoride powder to obtain a mixture; placing the mixture in a reactor and performing programmed temperature calcination under a protective atmosphere; discharging the sulfur and fluorine-containing volatile gas generated by calcination after treatment by an absorption system; cooling the calcined material to room temperature; washing the cooled material with water or blowing inert gas to remove residual ammonium salt or dust, and then drying to obtain a low-sulfur aluminum fluoride product. The in-situ HF generated by the decomposition of NH4HF2 is used for gas-solid reaction, which can effectively attack and convert stable sulfate impurities existing in various forms, has high desulfurization efficiency and is deep and thorough; the reaction conditions are mild, the main phase of the product is stable, the process flow is simple, and the energy consumption is low.

The invention provides an electrochemical fluorinated membrane and a preparation method and application thereof, specifically, the component of the electrochemical fluorinated membrane is aluminum fluoride, and all the aluminum fluoride in the electrochemical fluorinated membrane is of a body-centered cubic structure. In the preparation process of the electrochemical fluorinated membrane, the surface temperature of the aluminum alloy is close to 3400-3600 K, and the prepared electrochemical fluorinated membrane is glazed at the high temperature, so that the prepared electrochemical fluorinated membrane is more uniform. The electrochemical fluorinated membrane is uniform, compact and good in appearance. The aluminum alloy containing the electrochemical fluorinated film on the surface can improve the color difference yield of the appearance and reduce the cleaning cost. The aluminum alloy containing the electrochemical fluorinated film on the surface can improve the corrosion resistance of halogen elements. The aluminum alloy containing the electrochemical fluorinated film on the surface can improve the breakdown voltage resistance.

The utility model discloses a full-automatic warehousing device for aluminum fluoride products, which comprises a conveying device, two ends of the top of the conveying device are oppositely provided with bases, a second bevel gear rotates to drive a sleeve to rotate in a fixed frame, and the inner side wall of the sleeve rotates along the outside of a threaded rod when the sleeve rotates, so that the sleeve can enter the fixed frame. A supporting plate is driven by a threaded rod to perform lifting adjustment, so that the distance between a scanner body and a conveying device is conveniently adjusted, aluminum fluoride product packaging boxes of different sizes are conveniently scanned and put in storage, an electric telescopic rod extends to drive a cylindrical block to slide on the inner side wall of a limiting groove, and a pulley rotates in a sliding groove, so that the conveying device is convenient to use. Therefore, the end, away from the two fixing blocks, of the adjusting plate descends and inclines, the inclination angle of the scanner body can be adjusted conveniently, and the problem that scanning fails due to the fact that the distance between the scanner body and the packaging box is too long or scanning fails due to the fact that the angle is not right when a special-shaped packaging box is scanned is solved.

The invention belongs to the technical field of aluminum smelting solid hazardous waste recycling, and particularly relates to a recycling method of aluminum oxide-rich complex electrolyte hazardous waste. According to the method, the complex aluminum electrolyte hazardous waste, aluminum salt and silicon-containing oxide are mixed and then subjected to segmented roasting-leaching treatment, fluorine in the electrolyte is converted into aluminum fluoride firstly and then converted into silicon tetrafluoride gas, separation of fluorine and aluminum and separation of gas and solid are achieved, and sodium and lithium elements are converted into soluble salt and further separated and recycled. According to the process, collaborative recovery and high-value utilization of various valuable elements in the complex aluminum electrolyte hazardous waste are achieved. The whole technological process is environment-friendly, toxic and harmful gas emission is avoided, secondary solid waste residues are not generated, the method has the advantages of being simple in process, high in recovery rate, high in product additional value and the like, and a feasible technical scheme is provided for resource utilization of the aluminum electrolysis solid waste.

The application discloses a fluorite tailing waste residue production method of aluminum fluoride, and relates to the technical field of aluminum fluoride production processes. The fluorite tailing waste residue production method of aluminum fluoride comprises the following steps: step one, mixing the purified fluorite tailing and concentrated sulfuric acid according to a proportion, and heating and reacting in a rotary kiln to generate hydrogen fluoride gas; and step two, passing the hydrogen fluoride gas into a fluidized bed, and fluidizing and reacting the hydrogen fluoride gas in the fluidized bed in a posture of rotating around an aluminum hydroxide bed layer, and driving the aluminum hydroxide bed layer to tumble under the flow of the hydrogen fluoride gas. Through the driving of a rotating assembly in the fluidized bed, the hydrogen fluoride gas is driven to rotate around the aluminum hydroxide bed layer for fluidization and combination reaction, so that the hydrogen fluoride gas always passes through the aluminum hydroxide bed with uniform thickness, and the hydrogen fluoride gas acts on the uniform tumbling fluidization reaction of the aluminum hydroxide bed layer.

This invention provides a method for preparing an ultra-stable metal-doped aluminum fluoride catalyst and its application in photocatalytic carbon dioxide reduction, belonging to the field of catalytic materials. The invention first involves drying and grinding an aluminum-containing compound, then mixing it with a metal salt and introducing active metal sites and the key element fluorine through high-energy mechanical ball milling in a polytetrafluoroethylene (PTFE) ball mill jar. Subsequent heat treatment transforms the aluminum-containing precursor into a highly stable aluminum fluoride support through in-situ fluorination, successfully constructing an atomically dispersed metal-doped aluminum fluoride catalyst. This catalyst exhibits high activity and selectivity in CO₂ photoreduction and demonstrates excellent physical and chemical stability under extreme acid-base and high-temperature oxidizing environments. The preparation process of this invention is simple and environmentally friendly, breaking through the bottleneck of traditional catalysts' easy deactivation under extreme conditions, and providing a new path for developing highly stable photocatalytic materials.

The application discloses a method for improving current efficiency of an electrolytic cell, and relates to the technical field of electrolytic aluminum, which guarantees stable thermal balance of the electrolytic cell and improves current efficiency. The main technical scheme of the application is as follows: the method for improving current efficiency of the electrolytic cell comprises the following steps: S1, parameter acquisition and configuration; S2, target parameter determination and configuration; S3, current state parameter setting; S4, voltage additional amount calculation; S5, aluminum fluoride addition amount calculation; S6, voltage regulation execution; and S7, aluminum fluoride feeding control.

The invention provides a high-temperature-resistant carbon-based thermal insulation material and a preparation method thereof. The method comprises the following steps: modifying short carbon fibers by using a silane precursor and a hafnium tantalum precursor in sequence to obtain high-antioxidant short carbon fibers; preparing the antioxidant modified chopped carbon fibers into wet fiber sheets; mixing the hafnium tantalum nano boride powder, magnesia and aluminum fluoride, and then mixing with zirconium phosphate and an aluminum phosphate aqueous solution to prepare a glue solution; and alternately laminating and bonding the wet fiber sheets and the reflecting screens by using a glue solution, and carrying out mold pressing and curing to obtain the high-temperature-resistant carbon-based thermal insulation material. The invention also provides the carbon-based thermal insulation material prepared by the method. The novel ultrahigh-temperature multi-layer material which is semi-cured, good in flexibility and excellent in strength after curing is prepared from the novel high-oxidation-resistance short carbon fibers and the high-temperature-resistant zirconium phosphate sol, preparation of the high-strength ultrahigh-temperature-resistant multi-layer heat insulation material is achieved, and the purpose of durable application of the material is achieved.

The application provides an aluminum pad structure and a manufacturing method thereof. The manufacturing method of the aluminum pad structure comprises the following steps: sequentially forming a first aluminum layer, a protective layer and a passivation layer on a substrate; performing dry etching on the passivation layer by using a plasma containing fluoride ions to form a passivation layer opening, wherein the passivation layer opening is located above a preset region of the first aluminum layer and the bottom surface of the passivation layer opening stays on the surface of the protective layer; then forming a second aluminum layer on the protective layer and removing the part of the second aluminum layer which is higher than the passivation layer, thereby obtaining a sandwich-type aluminum pad structure composed of the first aluminum layer, the protective layer and the second aluminum layer. The manufacturing method of the aluminum pad structure can avoid the direct contact of the etching process with the aluminum pad, thereby eliminating the generation of aluminum fluoride compound residues and fluoride ion residues on the surface of the aluminum pad from the root. The aluminum pad structure is in a sandwich type, has less aluminum fluoride compound residues and fluoride ion residues, is beneficial to improve the bonding and yield test results, and reduces fluorine precipitation.

The application discloses a method for digesting and separating fluorinated aluminum by program, which comprises the following steps: placing a catalyst with metal elements supported on alumina as a carrier into a reaction container of a cluster digestion device, adding hydrochloric acid and / or nitric acid, setting a digestion program, introducing inert gas for pre-pressurization, performing primary digestion, and simultaneously starting a condensation reflux atomizer; after the program is completed, adding hydrofluoric acid, setting a digestion program, and performing secondary digestion; after the digestion is completed, entering a cooling and crystallization program, performing cooling and crystallization, and separating to obtain a sample solution to be detected and a solid; the solid is dried and calcined to obtain fluorinated aluminum crystals, and the liquid is used for detecting the content of metal elements. The method is applied to the digestion treatment of the alumina sample with metal elements supported thereon, has a large sample treatment range, complete digestion, no volatile loss of elements, and can separate AlF3 in an alpha crystal form through the program digestion of the digestion device.

The invention belongs to the technical field of aluminum fluoride production, and particularly relates to aluminum fluoride production tail gas comprehensive absorption equipment and method. The condensation mechanism comprises a separation frame fixedly connected to the shell, a condenser is installed on the separation frame, and a plurality of replacement cavities are formed in the separation frame; and the filtering mechanism comprises a plurality of filtering boxes detachably installed on the replacement cavity, water passing assemblies are installed at the upper ends and the lower ends of the filtering boxes, a water pump is installed between the two water passing assemblies, and a plurality of water storage tanks and water spraying assemblies are installed in the filtering boxes. According to the invention, by arranging a plurality of detachable filter boxes and replacement cavities, alkali liquor can be replaced without shutdown, and compared with a mode of difficult disassembly and assembly in the prior art, the situation that equipment needs to be shut down when the alkali liquor is replaced is reduced, and the convenience of alkali liquor replacement is improved.

The invention relates to the field of machine manufacturing, and particularly discloses a metal-based ceramic bond diamond grinding wheel and a preparation method thereof.The metal-based ceramic bond diamond grinding wheel comprises the following raw materials of a diamond grinding material, a reinforcing phase and a composite bond; wherein carbon fibers are selected as the reinforcing phase, the composite binding agent comprises a metal binding agent and the balance of ceramic binding agent, and the ceramic binding agent comprises the following raw materials of calcium fluoride, aluminum fluoride, lithium borate, boric acid and the balance of silicon dioxide; the preparation method comprises the following steps: S1, premixing the diamond grinding material and the reinforcing phase, then adding the composite binding agent, spraying a polyvinyl alcohol solution after mixing, and mixing and granulating to obtain granules; s2, the granules are loaded into a mold to be subjected to hot press molding to obtain a grinding wheel blank; and S3, sintering the grinding wheel blank at high temperature to obtain the metal-based ceramic bond diamond grinding wheel. The emery grinding wheel has the advantages that the abrasion resistance and the impact resistance of the grinding wheel are improved, and then the service life of the emery grinding wheel is prolonged.

The invention discloses a method for preparing HFO-1234yf by dehydrofluorination of HFC-245eb, which comprises the following steps: under the action of a catalyst, dehydrofluorination of HFC-245eb is carried out to obtain HFO-1234yf; the catalyst comprises an aluminum fluoride coated SBA-15 carrier and multi-metal active components A and B loaded on the carrier, A is Cr, and B is one or more than two of Mg, Fe, Ni, Co and Zn. According to the invention, high dispersity of active sites and rapid mass transfer of reactants / products are ensured by utilizing high specific surface area and uniform pore channels of SBA-15. The multi-metal nanoparticles provided by the invention have higher thermal stability. The strong interaction among various metals can improve the Tanchmann temperature of the nano particles, so that the nano particles can better maintain fine sizes at the reaction temperature, and more active sites are exposed.

The application of layered double hydroxide fluoride removal agent and its preparation method and application belong to the technical field of fluorine-containing wastewater treatment, and aim at the shortcomings and deficiencies of the existing single aluminum fluoride removal agent, and provide a kind of layered double hydroxide fluoride removal agent and its preparation method and application, which is based on the special aluminum polymer as the base, combined with divalent metal cations to form layered double hydroxide, which can greatly improve the positive charge density, the number of surface groups and the activity of the fluoride removal agent, and is more conducive to approaching and adsorbing pollutants.

The utility model relates to the related technical field of phosphorus removal, in particular to a phosphorus removal device for an aluminum fluoride solution. A water inlet is formed in one side of the top of the box body, a water outlet is formed in one side of the bottom of the box body, a valve is arranged in the water outlet, and an electrolysis equipment body is arranged on one side of the box body. Under the matching action of the box body, the water inlet, the water outlet, the valve, the electrolysis equipment body, the electrode and the polishing mechanism, an oxide layer on the surface of the electrode end can be polished, passivation of the electrode end is avoided, the electrolysis effect is improved, the phosphorus removal effect is further improved, and the service life of the electrolysis equipment is prolonged. The problems that although an existing dephosphorization device for the aluminum fluoride solution can be used for dephosphorization of sewage, the electrode end of electrolysis equipment is soaked in water for a long time, the surface is prone to oxidation, the electrode end of the electrolysis equipment is passivated, the electrolysis effect is affected, and the dephosphorization effect is poor are solved.

Surface modified substrates and related methods are provided. A substrate having a modified surface includes a first region and a second region. The first region is located above the second region. The first region includes aluminum fluoride. The second region includes an aluminum alloy. And the concentration of the aluminum fluoride is gradually reduced from the first region to the second region.

The invention belongs to the technical field of LED manufacturing, particularly relates to a UVB LED chip and a preparation method, and aims to improve the light transmittance of the UVB LED chip. The UVB LED chip comprises a substrate, an antireflection film, a filtering film, an N-type semiconductor layer, an active layer and a P-type semiconductor layer. The antireflection film is located on the surface of one side of the substrate, the filtering film is located on the side, away from the substrate, of the antireflection film, the N-type semiconductor layer is located on the side, away from the substrate, of the filtering film, the active layer is located on the side, away from the substrate, of the N-type semiconductor layer, and the P-type semiconductor layer is located on the side, away from the substrate, of the active layer. Wherein the material of the anti-reflection film comprises at least one of magnesium fluoride, aluminum fluoride and aluminum oxide, the thickness of the anti-reflection film is lambda / 4n, lambda is the target wavelength of the anti-reflection film, and n is the material refractive index of the anti-reflection film. The filtering film is a single-layer or multi-layer interference filtering film, and the material of the filtering film comprises at least one of titanium oxide, hafnium oxide, aluminum oxide, silicon dioxide and aluminum fluoride.

This invention belongs to the fields of solid waste resource utilization and non-ferrous metal metallurgy technology, and particularly relates to an aluminum-silicon alloy and its preparation method. Using aluminum ash, shell material, and diatomaceous earth as raw materials, the method includes the following steps: Step 1) Refining: Aluminum ash is roasted with alkali metal peroxide, and the resulting clinker is subjected to water leaching, acid precipitation, and calcination to obtain alumina; the solution after acid precipitation is collected, and alkali is added for precipitation to obtain aluminum fluoride; diatomaceous earth is roasted and then acid-leached, and the resulting solid is washed and dried to obtain silicon oxide powder; shell material is ground and then subjected to magnetic separation and air separation to obtain shell material powder; Step 2) Electrolysis: The alumina, aluminum fluoride, silicon oxide powder, and shell material powder are mixed in a certain proportion and then electrolytically reduced to obtain the aluminum-silicon alloy. The advantages of this invention are that it synergistically utilizes aluminum ash, shell material, and diatomaceous earth to prepare the aluminum-silicon alloy, fully utilizing the alumina, fluoride, and silicon dioxide components of the three materials, solving the technical problem of difficult separation of alumina and fluoride in shell material, and also solving the technical problem of low utilization value of diatomaceous earth.

The application provides a method for optimizing an aluminum electrolysis cell furnace, and belongs to the technical field of electrolysis cell repairing.The application provides a method for optimizing an aluminum electrolysis cell furnace, which comprises the following steps: replacing the corner anode of the aluminum electrolysis cell, then adding aluminum fluoride and calcium fluoride into the electrolyte, laying alumina on the surface of the electrolyte to form an alumina layer; laying a broken material layer and alumina on the surface of the alumina layer and the surface of the anode in sequence to form a composite heat-insulating layer; laying a fabric on the surface of the composite heat-insulating layer, and then laying a heat-insulating material layer on the outside of the bottom of the aluminum electrolysis cell.The synergistic effect of the fluorinated salt and the composite heat insulation promotes the gradual and natural melting of the stretched leg, thereby effectively reducing the stretched leg in the period, and gradually adjusting the set voltage, so as to ensure the stability of the electrolysis cell.

This invention discloses a method for efficiently preparing aluminum fluoride from aluminum ash, comprising the following steps: Aluminum ash is ground, preheated, and then oxidized for denitrification. Silicon chloride is used to chlorinate the aluminum, iron, and magnesium in the oxidized aluminum ash into aluminum chloride, ferric chloride, and magnesium chloride. High-purity aluminum chloride is obtained through multi-stage condensation and purification. The aluminum chloride is then gasified, preheated, and reacted with silicon tetrafluoride to produce aluminum fluoride and silicon chloride. The silicon chloride is recycled for use in the chlorination process. This invention significantly improves the oxidative denitrification efficiency of aluminum ash through grinding and activation. The chlorination process uses silicon chloride as the chlorinating agent, eliminating the need for carbon addition. The chlorination products are easily separated, and the operation is simple. Silicon tetrafluoride is used to fluorinate aluminum chloride to prepare aluminum fluoride. The byproduct silicon chloride can be recycled within the system, effectively reducing production costs. Simultaneously, the system has high energy utilization, enabling the harmless treatment of aluminum ash and the large-scale, efficient preparation of aluminum fluoride, resulting in significant economic and social benefits.