29 results about "Aluminum fluoride" patented technology

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.

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 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.

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 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.

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.

The application provides an equipment and process for cooperatively disposing and recycling aluminum by using aluminum electrolysis aluminum ash and waste carbon cathode, relates to the technical field of aluminum electrolysis waste resource utilization, and comprises a mixing kettle, a kettle cover, a buoyancy driving mechanism, a pH adjusting mechanism, a self-adaptive adjusting mechanism and a supporting frame; the buoyancy driving mechanism comprises a mounting frame fixed to the top of the kettle cover, a rotating shaft is longitudinally rotationally connected in the mounting frame, and rotating gears are fixed to the circumferential surface of the rotating shaft. According to the scheme, after the mixed fluorine source is completely injected into the mixing kettle, the liquid level in the mixing kettle reaches a set value, at this time, the dropping hose is completely pressed to death through the rotation of the extrusion disc, the floating capsule and the floating rod stop moving upward, the dosing is automatically stopped, precise parking without overshoot is realized, the dosing speed is adaptively decreased along with the adjusting process, and the problems of overshoot, oscillation or local unevenness caused by manual or simple constant-speed dosing are fundamentally avoided, and the aluminum recovery rate and the purity of aluminum fluoride are greatly improved.

The application provides a composite current collector, a preparation method thereof and a negative electrode-free battery. The composite current collector comprises a current collector substrate, and an aluminum fluoride layer, an aluminum phosphide layer and a conductive layer which are sequentially arranged on at least one side surface of the current collector substrate. The composite current collector provided by the application has improved sodium affinity and reduced risk of interface side reaction by the aluminum fluoride layer covering the current collector substrate. The sodium nucleation overpotential is reduced by the aluminum phosphide layer, thereby further improving the sodium affinity. The current distribution and sodium deposition effect are optimized by the conductive layer. Therefore, the composite current collector has excellent sodium deposition uniformity, the negative electrode-free battery containing the composite current collector has high initial coulombic efficiency and excellent cycle stability. In addition, the composite current collector has the advantages of simple structure, easily available raw materials and easy realization of large-scale production.

An example semiconductor processing method can include forming a plasma of a fluorine-containing precursor. The method can include performing a chamber clean in a processing region of a semiconductor processing chamber. The processing region can be at least partially defined between a faceplate and a substrate support. The method can include generating aluminum fluoride during the chamber clean. The method can include contacting a surface within the processing region with a carbon-containing precursor. The method can include volatilizing the aluminum fluoride from the surface of the processing region.

This invention discloses a method for recycling aluminum fluoride waste, belonging to the field of fluoride salt resource recycling technology. Addressing the problems of poor selectivity, high acid consumption, and low recovery rate in existing technologies for aluminum fluoride waste, this invention provides a selective separation method based on the principle that cryolite dissolves in aluminum salt solution while aluminum fluoride remains insoluble. The method includes: mixing aluminum fluoride waste with an aluminum salt solution, and conducting a selective dissolution reaction under specific temperature, pH, and liquid-solid ratio conditions, allowing cryolite and alumina to dissolve into the solution phase while aluminum fluoride remains insoluble; obtaining aluminum fluoride product and leachate through solid-liquid separation; the leachate can be further precipitated by adding fluoride salts to recover the cryolite product. This invention's method is simple, highly efficient, and produces high-purity products, achieving effective separation and resource utilization of the two valuable components in aluminum fluoride waste.

The utility model discloses a kind of aluminium fluoride reaction kettle with stirring mechanism, including reaction shell, the upper side of the reaction shell is equipped with shell, further including stirring mechanism;Stirring mechanism: it includes inner shaft, outer shaft, inner stirring rod, outer stirring rod, annular seat and spiral stirring piece, the top wall of reaction shell is rotatably connected by bearing one with outer shaft, the inside of outer shaft is rotatably connected with inner shaft by bearing two, the outer side lower end of inner shaft is equipped with outer stirring rod, the outer side lower end of outer shaft is equipped with inner stirring rod, the outer side of outer shaft and inner shaft is equipped with annular seat, the outer side of annular seat is equipped with spiral stirring piece, this aluminium fluoride reaction kettle with stirring mechanism, by each element cooperation, so that aluminium fluoride raw materials in device is mixed in four kinds of mixed state, by mutual collision of aluminium fluoride raw materials between four kinds of mixed state, improve the stirring speed of device to aluminium fluoride raw materials, and then indirectly improve the preparation speed of device to aluminium fluoride.

The application provides a manufacturing method of a semiconductor structure, which deposits a titanium-tungsten alloy layer on the surface of an aluminum pad as a sacrificial protective layer, so as to reduce the contact opportunity of fluorine ions and the aluminum pad, thereby avoiding the generation of aluminum fluoride and reducing the residue of fluorine ions on the surface of the aluminum pad; in the subsequent wet cleaning step, all by-products generated in the etching stage will be removed synchronously with the sacrificial protective layer. The application adopts the titanium-tungsten alloy layer as the sacrificial protective layer, which is easy to deposit on the surface of the aluminum pad and does not interfere with the properties of the aluminum pad, and the removal condition is more moderate, which will not cause damage to the passivation layer and the surface of the aluminum pad to be reserved. In addition, for the unopened area of the aluminum pad, the passivation layer and the upper surface of the aluminum pad are separated by the titanium-tungsten alloy layer, due to the strong interaction between the titanium-tungsten alloy layer and the aluminum layer, which helps to limit the diffusion of aluminum, and due to the stable properties and strong oxidation resistance of the titanium-tungsten alloy layer, the structure of the edge area of the aluminum pad is more stable.

The utility model provides a kind of sewage depth defluorination system, it is related to sewage treatment field, including inlet pipe, outlet pipe, alkalinity adjusting mechanism, sewage treatment mechanism and control panel, the one end of inlet pipe is communicated with alkalinity adjusting mechanism, the alkalinity adjusting mechanism is communicated with sewage treatment mechanism, the sewage treatment mechanism is communicated with outlet pipe, water quantity monitor is equipped on inlet pipe, water quantity monitor is electrically connected with control panel;The utility model is through the control of total alkalinity and the alkalinity supplement of weak acid salt, maintains defluorination system pH stable, both can avoid high pH condition, the defluorination efficiency drop caused by the rapid hydrolysis settlement of defluorination agent (aluminum salt), also avoided the difficulty removal of large amounts of aluminum fluoride polymer formed when pH drops in the hydrolysis process of aluminum salt when adding defluorination agent under neutral condition, to reduce the residue of fluorine and aluminum in effluent.

The present application belongs to the technical field of comprehensive utilization of aluminum industrial waste resources, and particularly relates to a method for high-value treatment of post-lithium-extraction slag of overhaul slag, which realizes a method for recovering valuable elements such as fluorine, aluminum and sodium in post-lithium-extraction slag of overhaul slag through fluorosilicic acid treatment. The post-lithium-extraction slag is treated by the method, so that the final product is converted into high-molecular poly cryolite and aluminum fluoride products with high quality; efficient recycling of valuable elements such as fluorine, aluminum and sodium is realized, and the resource utilization efficiency of related elements is improved.

The application discloses a dust removal and cooling device for aluminum fluoride production and relates to the technical field of tail gas treatment equipment. A heat exchange pipe is arranged in a waste heat recovery device. The heat exchange pipe comprises multiple horizontal sections arranged horizontally. Tail exhaust pipes are coaxially arranged outside the corresponding horizontal sections of the heat exchange pipe. A first fixing seat is coaxially arranged outside the horizontal sections. A flow guide assembly is arranged outside the first fixing seat. An inductive element capable of automatically extending and contracting according to temperature is arranged inside the first fixing seat. The inductive element can drive the flow guide assembly to close a ring-shaped heat exchange cavity when the inductive element contracts. A turbulence passage is arranged in the first fixing seat. Turbulence fan blades are rotatably connected to the tail flow end of the first fixing seat. A starting sliding block is axially slidably connected to the first fixing seat. The inductive element can contract and drive the starting sliding block to slide to open the turbulence passage when the inductive element senses temperature change. Meanwhile, the flow guide assembly closes the ring-shaped heat exchange cavity, so that the tail gas flows through the turbulence passage and drives the turbulence fan blades to rotate. The application has the effect of reducing corrosion of the heat exchange pipe.

This invention discloses a method for preparing a uniform aluminum fluoride layer on an aluminum alloy surface and its application, relating to the field of surface treatment technology. The preparation method employs ultrasonic nanocrystalline surface modification technology to treat the surface of an aluminum alloy substrate, forming a uniform and dense nanocrystalline layer on the surface. Subsequently, an aluminum fluoride layer is grown in situ using a fluorine-containing plasma atmosphere through fluorination etching. The nanocrystalline layer has a high-density and uniformly distributed grain boundary structure, and the modification technology simultaneously forms a plastic deformation influence layer with a high dislocation density beneath the nanocrystalline layer, allowing the fluorination reaction to proceed synchronously and uniformly to the depth throughout the surface, resulting in a uniform and dense fluoride layer. When the aluminum alloy product prepared by this invention is used as a heating plate in a semiconductor thin film deposition equipment, it can provide a stable and uniform temperature field for the wafer under radio frequency conditions, reducing process disturbances caused by local insulation failures and improving the stability of the thin film deposition process and product yield.

This utility model provides a pretreatment device for aluminum electrolytic cells, relating to the field of aluminum electrolytic cell technology. It includes: a housing with an inlet and an outlet; a first motor located at the top of the housing, with a first rotating rod extending into the interior of the housing from its output end; multiple stirring rods circumferentially arranged on the outer wall of the first rotating rod; multiple striking rods circumferentially arranged on the inner wall of the housing, with gaps between adjacent striking rods and a stirring rod between them; a heater located on the inner wall of the housing, with one heater between every two adjacent striking rods; a discharge pipe, one end connected to the outlet of the housing and the other end connected to the discharge port of the electrolytic cell; and a first air pump located between the discharge pipe and the discharge port of the electrolytic cell for conveying powder. This pretreatment device can preheat the aluminum fluoride powder, preventing blockage at the discharge port of the electrolytic cell due to agglomeration during conveying.

This utility model discloses a reflux device for an aluminum fluoride reaction vessel, including a reaction vessel body. An exhaust pipe is installed on one side of the top of the reaction vessel body. A support is fixed to the top of the reaction vessel body, and a condenser tube is installed inside the support. A first spiral tube and a second spiral tube are respectively installed inside the condenser tube. A liquid outlet pipe is installed at the top of the condenser tube, and a liquid inlet pipe is installed at the bottom. The bottom end of the first spiral tube extends below the condenser tube and is equipped with a reflux rod. The bottom end of the second spiral tube extends below the condenser tube and is equipped with a circulation pipe. This utility model, by setting up a circulating condensation structure, allows volatile substances to circulate within the first and second spiral tubes, preventing accumulation and localized temperature increases. The volatile substances are always in a flowing state and in full contact with the circulating cooling medium, thereby improving the condensation effect.

This application relates to the field of aluminum-lithium alloy waste recycling technology, and in particular to a covering flux for recycled Al-Li alloys, its preparation method, and its application. The raw materials for preparing this recycled Al-Li alloy flux are lithium chloride, lithium fluoride, aluminum fluoride, and calcium fluoride. This covering flux is used in the remelting and recycling of recycled aluminum-lithium alloys, simultaneously providing covering, slag removal, degassing, and refining functions. It results in minimal lithium loss, is sodium-free and potassium-free, and exhibits excellent melt purification. This achieves high purity of the melt in the remelting and recycling of recycled aluminum-lithium alloys. Aluminum-lithium alloy ingots prepared from the recycled aluminum-lithium alloy melt using the covering flux of this application exhibit high purity and excellent production quality.

This invention discloses a method for preparing high specific surface area metal fluorides using aqueous polyamines. This method is suitable for preparing magnesium fluoride and aluminum fluoride. The preparation of magnesium fluoride includes: adding polyamine to an aqueous solution of a soluble magnesium salt at 30℃–60℃ with stirring, then adding hydrofluoric acid dropwise, and continuing stirring for 10–70 minutes after the addition is complete; adding ammonia dropwise to adjust the pH to 8–10, and continuing stirring for 60–180 minutes; filtration, washing the filter cake with deionized water until the pH of the filtrate is ~7, drying at 80℃–120℃, and calcining at 260℃–400℃. The preparation of aluminum fluoride includes: adding polyamine to an aqueous solution of a soluble aluminum salt at 30℃–60℃ with stirring, then adding hydrofluoric acid dropwise, and continuing stirring for 30–90 minutes after the addition is complete; filtration, washing the filter cake with deionized water until the pH of the filtrate is ~7, drying at 80℃–120℃, and calcining at 260℃–400℃. This invention can effectively reduce the preparation cost of high specific surface area metal fluorides and has industrial application value.

The application discloses a phosphorus-carbon-aluminum fluoride composite material, a preparation method and application thereof, and a lithium ion battery negative electrode. The phosphorus-carbon-aluminum fluoride composite material comprises a phosphorus-carbon matrix and aluminum fluoride crystals dispersed in the phosphorus-carbon matrix, stable phosphorus-carbon covalent bonds are formed in the phosphorus-carbon matrix, and the mass ratio of the aluminum fluoride crystals to the phosphorus-carbon matrix is 5-20:80-95. Through mechanical force action of high-energy ball milling, the phosphorus source and the carbon material are promoted to form phosphorus-carbon covalent bonds, and meanwhile, the aluminum fluoride crystals are uniformly dispersed in the phosphorus-carbon matrix. The carbon material improves the conductivity of the material, the phosphorus-carbon bond enhances the interface bonding force and inhibits volume expansion, and the aluminum fluoride optimizes the interface structure, inhibits the dissolution and oxidation of polyphosphorus compounds. The three components synergistically make the material have high conductivity, structural stability and interface stability. The aluminum fluoride as an additive can significantly improve the fast-charging performance and long cycle life of the lithium ion battery.

The application discloses a high-energy-density lithium iron phosphate cylindrical battery and a preparation method thereof, and relates to the technical field of lithium iron phosphate batteries. The battery is a full-tab or tab-free winding structure. A positive electrode end micro-tab end face is pressed against an aluminum or aluminum alloy current collector ring and is laser-welded at a welding window. The end face of the current collector ring is provided with a ring-shaped two-layer gradient micro-hole composite interface layer, which comprises a bonding passivation seed layer and a heat-conducting and electrically-conducting micro-hole network layer. Both layers contain aluminum fluoride particles and lithium phosphate particles. The outer layer contains hexagonal boron nitride, aluminum nitride and an electrically-conductive carbon skeleton. The separator is provided with a positive electrode end functional belt. The electrolyte contains lithium hexafluorophosphate, lithium bisfluorosulfonylimide, lithium difluorophosphate and lithium difluoro oxalate borate. After liquid injection and immersion, pre-charging and pulse directional activation are performed. The battery can inhibit end hot spots and corrosion, reduce end temperature difference, reduce connection resistance drift and gas production, and improve fast-charging window, cycle life and consistency under fast charging and high power.

The utility model relates to the field of aluminium fluoride material drying, specifically relates to a kind of aluminium fluoride material drum drying equipment, including mounting bracket, the top of mounting bracket is provided with drum, the drum includes rotating cylinder, discharge cylinder and feed cylinder, the rotating cylinder rotates between discharge cylinder and feed cylinder, the top of feed cylinder is equipped with feed hopper, the bottom of discharge cylinder is equipped with discharge pipe, one end of feed cylinder is equipped with hot air blower, and hot air blower is equipped with ventilation chamber between discharge cylinder, the inside of drum is equipped with stirring assembly;The utility model is by being provided with stirring assembly in the inside of drum, using motor to drive stirring rod to rotate, let rotating stirring rod drive branch rod rotation, to carry out stirring to the material in the inside cavity of drum, make it dispersion, dispersed material and hot air contact more fully, and then reach better drying effect.

An enamel composition, a method for preparing an enamel composition, and a cooking appliance are provided. The enamel composition may include 15 to 50 wt % of phosphorus pentoxide (P2O5); 5 to 20 wt % of one or more of lithium oxide (Li2O), sodium oxide (Na2O), or potassium oxide (K2O); 1 to 5 wt % of one or more of sodium fluoride (NaF), calcium fluoride (CaF2), or aluminum fluoride (AlF3); 1 to 35 wt % of one or more of magnesium oxide (MgO), barium oxide (BaO), or calcium oxide (CaO); and 5 to 30 wt % of one or more of manganese dioxide (MnO2), molybdenum trioxide (MoO3), bismuth oxide (Bi2O3), or nickel oxide (NiO). The enamel composition may be cleaned without being putting it into water.

Systems and methods for operating a deposition tool are provided. In one aspect, the method includes processing a substrate in a processing chamber including a ceramic showerhead and a coating. The coating includes material deposited in the processing chamber. The ceramic showerhead is heated to a processing temperature during the processing of the substrate. The method further includes performing a cleaning process to remove the coating by introducing a reactive cleaning species into the processing chamber while flowing a purge gas through the ceramic showerhead and by heating the ceramic showerhead to a bake-out temperature above the processing temperature to remove at least some aluminum fluoride particles generated during the cleaning process. The method further includes applying a new coating to the processing chamber.

The application discloses a kind of high-strength glass solidification repair materials, including carbon fiber, ceramic particles, borosilicate base glass, aluminum fluoride, zinc oxide, titanium oxide, zirconium oxide, aluminum oxide and aluminium silicate, by reasonable formula and precision preparation process, it has outstanding corrosion resistance, radiation resistance and high-strength characteristics.Formula includes borosilicate base glass, carbon fiber, ceramic particles, aluminum fluoride and a variety of functional components, and is prepared by high-temperature furnace fusion welding.The repair material is successfully applied to the repair of high-level liquid waste storage container, conveying pipeline and other equipment, and a plurality of performance tests show that it has achieved significant improvement in various performance indicators.The technical scheme provides a comprehensive, stable and multifunctional solution for the development of high-strength glass solidification repair materials.

The application discloses a fluorinated aluminum tail gas desulfurization and denitration system, which effectively realizes the purpose of more uniform waste water scattering process, and comprises a feeding module, a drying tower, an air heating module, a primary cyclone separator, a secondary cyclone separator and a waste gas treatment module; the drying tower comprises a tower body, a hot air distributor, an atomizer, an observation manhole, a tower inner illumination module and a pneumatic knocking hammer; the lower side of the atomizer is provided with a scattering frame; the fluorinated aluminum tail gas denitration method comprises the following steps: step S1, waste water feeding; step S2, waste water atomization; step S3, waste water micro-droplet solidification; and step S4, drying tail gas treatment in the tower body; the application has the advantages of novel structure, ingenious design, simple and convenient operation, effective collection of dried solid particles, increased atomization effect of waste liquid during atomization, adaptability to different atomization liquid feeding amounts and the function of atomization effect adjustment during atomization.

This invention discloses a system and method for preparing aluminum fluoride from alumina. First, fine alumina powder is chlorinated to aluminum chloride in a fluidized bed with internal components using silicon chloride. Then, aluminum chloride is fluorinated with silicon fluoride in a fluidized bed with added seed powder to obtain aluminum fluoride and silicon chloride. The silicon chloride is recycled for the chlorination reaction. This invention uses silicon chloride as the chlorinating agent in the alumina chlorination reaction, eliminating the need for carbon preparation and pelletizing, simplifying operation, and facilitating product separation and purification. Using a fluidized bed as the chlorination and fluorination reactor results in rapid gas-solid phase mass and heat transfer and high reaction efficiency. The internal components in the chlorination reactor significantly improve fluidization quality and increase gas-solid contact efficiency. Adding seed powder to the fluorination reactor provides nucleation sites and a matrix, facilitating product collection. The silicon chloride, a byproduct of the fluorination reaction, can be recycled for the chlorination reaction, resulting in a high system recycling rate, effectively reducing production costs, and demonstrating good economic and social benefits.