235results about "Aluminium fluorides" patented technology

The invention provides equipment for extracting lithium from electrolytic aluminum slag and a process for extracting lithium and co-producing cryolite, and relates to the technical field of solid waste treatment, the equipment comprises a bottom plate, a heating tank, an extracting tank, a filtering tank, a top cover, a driving mechanism, a switching mechanism and a mixing mechanism; the heating tank is installed on the upper surface of the bottom plate, the extraction tank is installed inside the heating tank, the filtering tank is installed inside the extraction tank, the top cover is installed on the upper surface of the filtering tank in a sealed mode, and a liquid inlet pipe and a feeding pipe are installed inside the top cover. According to the scheme, the conical mixing barrel and the linkage overturning type material mixing plate are adopted, the material mixing plate can overturn caustic soda flakes into the electrolytic aluminum slag, then the caustic soda flakes and the electrolytic aluminum slag are mixed through the material mixing rod, it can be guaranteed that the caustic soda flakes can be evenly mixed with the electrolytic aluminum slag through the design, and it is guaranteed that the caustic soda flakes can be well attached to the surface of the electrolytic aluminum slag; and rapid overheating can be avoided when the subsequent caustic soda flakes are contacted with water, so that the filter tank works more stably and safely.

The invention belongs to an aluminum fluoride production technology, and particularly relates to a process and a system for producing aluminum fluoride by matching with a low-grade fluorite dry method, fluorite powder and sulfuric acid are added into a pre-reactor to be uniformly mixed and then are guided into a reaction furnace to be heated, and when the reaction furnace rotates, a free spiral structure in the reaction furnace rotates to promote the reaction of the fluorite and the sulfuric acid; discharging the calcium sulfate through a discharging spoon at the discharging end of the reaction furnace, and collecting the hydrogen fluoride volatilized from the reaction furnace; volatilized hydrogen fluoride enters a pre-purification tower and is treated to obtain purified hydrogen fluoride gas, the purified hydrogen fluoride gas and dried aluminum hydroxide are added into a fluidized bed to react to obtain aluminum fluoride and tail gas, and the tail gas enters a tail gas recovery treatment system. The problems that low-grade fluorite is poor in resource utilization rate, prone to crusting in a reaction furnace, low in fluorine utilization rate and the like are solved.

The invention provides equipment for extracting aluminum and calcium from solid waste and a method for recovering valuable components. The solid waste recovery device comprises a bottom plate, a pedestal, an extraction tank, a treatment tank and an extraction mechanism, the pedestal is installed on the upper surface of the bottom plate, the outer wall of the extraction tank is installed on the inner wall of the pedestal, a water tank is installed on the upper surface of the bottom plate and located on one side of the pedestal, and the treatment tank is fixedly arranged on the upper surface of the water tank; according to the scheme, through system integration of hydrothermal acid leaching, multi-stage solid-liquid separation and leachate refining technologies, deep extraction and efficient utilization of valuable elements such as fluorine, sodium and aluminum are achieved, the resource recovery rate is remarkably increased, the high-temperature energy consumption mode of traditional pyrogenic process treatment is broken through, the energy consumption is reduced, and the energy consumption is reduced. And the convex plate continuously rotates to control the guide wheel to enable the lifting rod to do reciprocating lifting motion in the extraction tank, so that the liquid level vortex phenomenon caused by traditional rotation can be eliminated, and the top liquid level of the extraction tank is more stable.

Provided are: a novel composite compound for a low-dielectric-loss resin composition, which suppresses the loss coefficient in a high-frequency band and has good dielectric loss; a low-dielectric-loss resin composition; a molded article for a high-frequency device; and a high-frequency device. This composite compound for a low-dielectric-loss resin composition is a composite compound for a low-dielectric-loss resin composition, and is characterized by containing a base material containing an inorganic fluoride and particles of a fluororesin held on at least a part of the surface of the base material, the dielectric loss tangent of the particles of the fluororesin is 0.002 or less at a frequency of 1 GHz or more and a temperature of 25 DEG C.

The invention relates to the technical field of aluminum fluoride production, in particular to a method for reducing the content of fine powder and metal impurities in an aluminum fluoride product, which comprises the following steps: preparing an aluminum fluoride solution by taking an ammonium bifluoride solution and aluminum hydroxide as raw materials; adding a sodium sulfide solution into the aluminum fluoride solution, and purifying to obtain a secondary aluminum fluoride solution; crystallizing and calcining the secondary aluminum fluoride solution, crushing and screening the calcined product, and removing fine powder to obtain a semi-finished product aluminum fluoride; according to the method, impurities and metal impurities are removed from the semi-finished product fluorinated powder through magnetic separation equipment, aluminum fluoride powder is purified again, and an aluminum fluoride product is obtained, the metal impurities in the produced aluminum fluoride product are removed through a sulfide precipitation method, fine powder is removed through a crushing and screening method, and the aluminum fluoride product is obtained. And finally, residual metal impurities in the crushed aluminum fluoride product are adsorbed and removed through a magnetic separator, by means of the double impurity removal technology, more than 98% of metal impurities in the aluminum fluoride can be removed, and the production quality of the aluminum fluoride product is greatly improved.

The utility model discloses a fluidized bed for producing aluminum fluoride, which comprises a box body, the top and the side part of the box body are respectively provided with a feed port and an air inlet, and the air inlet is externally connected with an air inlet pipeline. A plurality of sets of rotatable conveying belts are arranged in an inner cavity of the box body in an up-down staggered mode. The device further comprises a bucket elevator, a feeding pipe and a discharging pipe are arranged on the upper side and the lower side of the bucket elevator respectively, and a backflow inlet is formed in the top of the box body. The utility model relates to the technical field of aluminum fluoride production, the fluidized bed for producing aluminum fluoride can prolong the contact reaction time of aluminum hydroxide particles and hydrogen fluoride gas in a limited space by arranging a plurality of conveyor belts which are distributed in a staggered manner, and further, the contact reaction time of the aluminum hydroxide particles and the hydrogen fluoride gas can be prolonged by arranging a bucket elevator. Aluminum hydroxide particles can circularly move on the conveying belt, so that the contact time of the aluminum hydroxide particles and hydrogen fluoride gas is greatly prolonged, and the preparation efficiency of aluminum fluoride can be fully ensured.

The invention discloses an efficient preparation process of cryolite, and relates to the field of cryolite preparation. The process comprises the following steps: S1, taking carbon residues ground by a ball mill, and putting the carbon residues into a dissolution reaction kettle filled with alkali liquor for reaction; s2, after the reaction in the reaction kettle is finished, filter pressing is performed through a plate-and-frame filter press, and coarse carbon powder and filtrate are obtained; s3, pumping the filtrate into a carbon reaction kettle, and introducing carbon dioxide for reaction; s4, after the reaction in the carbon component reaction kettle is finished, carrying out filter pressing through a plate-and-frame filter press; and S5, drying the solid material obtained by filter pressing in a calcining furnace to obtain cryolite. In the process, the industrial waste carbon residue is used as a raw material, and participates in a series of reactions to prepare the cryolite after being subjected to ball-milling refining treatment, so that resource recycling of the waste is realized. The method not only effectively reduces the pollution of the carbon residue to the environment, reduces the accumulation amount of solid wastes, but also reduces the exploitation of natural cryolite minerals, and protects non-renewable resources.

The present application provides a method for removing impurities from multi-source photovoltaic wastewater and synergistically preparing fluorine products in a cascade manner, which realizes deep removal of fluoride and recovery of fluorine resources through a three-stage treatment system. The primary treatment uses concentrated alkaline wastewater to react with magnesium salts, effectively removes silicates through flocculation and precipitation, and recovers magnesium silicate products. In the secondary treatment, silicon-containing concentrated acid wastewater reacts with barium salts to remove silicate ions and is then mixed with the primary waste liquid. After adjusting to the optimal pH, aluminum salts are added for coagulation and precipitation to recover cryolite. The tertiary treatment uses crystal seeds to induce calcium fluoride crystallization, further reducing the fluoride ion concentration to below 8 mg / L to meet wastewater discharge standards, and at the same time recovering calcium fluoride products; the entire process is simple, low-cost, and the recovered product is of high quality, in line with national standards, and has significant economic and environmental benefits. In addition, the present application realizes "waste treatment with waste", reduces wastewater treatment costs, and meets the requirements of sustainable development.

The invention provides a method for treating waste water containing fluorine and aluminum, which comprises the following steps: S1, first treatment: reacting a first mixed solution, and carrying out solid-liquid separation to obtain a first treated solution and first treated slag; wherein the first mixed solution comprises waste water containing fluorine and aluminum and ammonia water, and the pH value of the first mixed solution is 7-8; s2, second treatment, wherein the second treatment comprises the steps S2'and S2 ''; s2 ', the first treatment slag and a hydrofluoric acid solution are mixed for acid dissolution, and an acid solution is obtained; mixing an acid solution and sodium fluoride, and carrying out precipitation treatment to obtain cryolite; s2 '', mixing the first treatment liquid with calcium chloride, performing defluorination treatment, and performing solid-liquid separation to obtain calcium fluoride and defluorination waste liquid. By the treatment method, cryolite with high yield and high purity can be prepared, and meanwhile, the low-aluminum and low-fluorine discharge requirements can be met.

The invention belongs to the technical field of batteries, and particularly discloses a lithium manganese iron phosphate material and a preparation method thereof, a secondary battery and an electric device. The lithium iron manganese phosphate material comprises an inner core and a shell, wherein the inner core is lithium iron manganese phosphate coated with lithium iron phosphate; the shell is positioned on at least part of the surface of the inner core; the shell comprises a fluorine-containing passivator and a carbon material, and based on the total mass of the lithium manganese iron phosphate material, the mass percentage content of fluorine is 0.5%-2.0%, and the mass percentage content of carbon is 1.0%-2.0%. The lithium manganese iron phosphate material has good structural stability and strong conductivity, and is convenient for the battery to give consideration to cyclicity and gram volume exertion at the same time.

The invention provides a method for high-value utilization of sodium aluminum fluorochlorate in a secondary aluminum ash wet pretreatment solution, and relates to the field of secondary aluminum ash resourceful treatment. The method specifically comprises the following steps: adding secondary aluminum ash into an aqueous solution, carrying out controllable reaction, carrying out wet pretreatment on the secondary aluminum ash, and filtering slurry, so as to obtain a solution containing fluorine, chlorine, aluminum and sodium ions besides high-aluminum slag; adding an additive into the solution, carrying out controllable precipitation and enhanced crystallization, precipitating coarse and well-crystallized sodium hexafluoroaluminate (cryolite), and carrying out solid-liquid separation to obtain cryolite; and performing membrane concentration on the filtrate to obtain a high-concentration sodium chloride solution, and performing concentration or evaporative crystallization on the high-concentration sodium chloride solution to obtain a sodium chloride solid which can be used as a caustic soda industrial raw material. According to the method, sodium, aluminum, fluorine, chlorine and other elements in the secondary aluminum ash wet pretreatment liquid are efficiently, safely and comprehensively utilized, solution circulation is achieved, the negative effects of fluorine and chlorine on subsequent aluminum oxide production and aluminum oxide-based material preparation are reduced, and safe and full-quantitative utilization of the secondary aluminum ash is promoted.

The invention belongs to the technical field of aluminum industry solid hazardous waste resource utilization, and relates to a secondary aluminum ash and overhaul slag co-processing method which comprises the following steps: S1, crushing secondary aluminum ash, adding concentrated sulfuric acid, uniformly mixing, and roasting to obtain clinker; adding water into the clinker, leaching and filtering to obtain filtrate A and aluminum oxide; s2, crushing the overhaul slag, adding the filtrate A, leaching and filtering to obtain filtrate B and leaching slag; s3, adjusting the pH value of the filtrate B to 1-11, reacting, and filtering to obtain filtrate C and cryolite; and crystallizing the filtrate C to obtain sodium sulfate. The concentrated sulfuric acid mixed roasting process is adopted for the secondary aluminum ash, reaction of concentrated sulfuric acid and alpha-Al2O3 with MgAl2O4 is promoted under the high-temperature condition, aluminum in the secondary aluminum ash is converted into soluble aluminum sulfate, and therefore the leaching rate of aluminum is increased.

The present invention provides a method for preparing large-sized aluminum fluoride products from aluminum electrolyte leaching solution, belonging to the technical field of aluminum electrolyte resource recovery. S1: Take the aluminum electrolyte leaching solution, and the molar ratio of F element to Al element in the aluminum electrolyte leaching solution is 1-2.5:1; S2: Heat the aluminum electrolyte leaching solution and add an alkali solution. When hydroxyaluminum fluoride precipitates in the aluminum electrolyte leaching solution, add crystal seeds and an organic surfactant, and continue to add the alkali solution to adjust the pH value to 2-7; stir and age, and then filter to obtain a filter cake and a filtrate; S3: Dry the filter cake, add ammonium bifluoride, mix well and then calcine to obtain aluminum fluoride products. The present invention provides a method for preparing large-sized aluminum fluoride products from aluminum electrolyte leaching solution, which solves the technical problems of too fine particle size and low purity of aluminum fluoride products in the prior art.

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 provides a non-ferrous metal recovery method and an aluminum electrolyte carbon residue comprehensive utilization process, and relates to the technical field of metal recovery and utilization. A non-ferrous metal recycling method comprises the following steps that S1, pretreatment of raw materials is conducted, specifically, aluminum electrolyte is crushed and screened through a crusher to prepare carbon residue powder, the carbon residue powder and an alkaline compound are mixed according to the mass ratio and then put into a muffle furnace to be roasted, fluoride is converted into calcium fluoride, cyanide is converted into calcium cyanate, and roasted residues are generated; and S2, leaching treatment is conducted, specifically, the roasting slag in the step S1 is put into a constant-temperature water bath pot through a sulfuric acid solution to be leached. According to the scheme, enrichment of valuable metals such as aluminum and lithium can be finally achieved by leaching the roasting slag through sulfuric acid, impurities such as iron and aluminum are accurately separated from the leachate through a fractional precipitation method, calcium ions are selectively precipitated through oxalic acid, a high-purity lithium solution is finally obtained, a battery-grade lithium carbonate product is prepared after lithium precipitation, effective recovery and utilization of non-ferrous metals are achieved, and the method is suitable for industrial production. The energy is saved.

To provide a liquid dispersion of fluoride particles, the dispersion having excellent dispersibility, being suitable for production of an optical film such as an anti-reflection film, and having a refractive index lower than that of magnesium fluoride, for example; a composition for forming an optical film; and an optical film.SOLUTION: A liquid dispersion of fluoride particles according to the present invention comprises fluoride particles, an anionic surfactant as a dispersing agent for the fluoride particles, and an organic solvent. The fluoride particles contain, in the compositional makeup thereof, at least aluminum and an alkali metal, and an alkaline-earth metal as an arbitrary element, and are dispersed in the organic solvent.SELECTED DRAWING: None

The application provides an energy-saving building material production equipment and an aluminum electrolysis overhaul slag recycling method. The application relates to the field of energy-saving building material production equipment, and the energy-saving building material production equipment comprises a base. The energy-saving building material production equipment provided by the application inputs roasting gas into a drying outer cylinder, drives a drying inner cylinder to rotate and tumble filter residue A through a drying motor, and performs drying, so that energy is effectively saved. The filter residue A after drying is input into a crushing box through a lifting conveyor belt, is crushed by crushing cutters, is sieved, is input into a mixing box through a discharge hopper, is mixed with mixed material, cement and lime to obtain the mixed material, the mixed material is pressed into no-burning bricks by pressing the mixed material into the first mold through an upper pressing die head and a lower pressing die head, meanwhile, the second mold synchronously completes filling to realize continuous production, the filter residue A is converted into the no-burning bricks, waste resource utilization is realized, and environmental pollution is reduced. The double molds work alternately, production is ensured to be uninterrupted, and overall productivity and economic benefits are improved.

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.

The application discloses a process for preparing high-molecular-ratio cryolite and ammonium sulfate by using fluorine-containing etching waste liquid, and comprises the following steps: adding sodium metaaluminate slurry and sodium sulfate solution into the fluorine-containing etching waste liquid, then adjusting pH to be acidic by using a sulfuric acid solution, carrying out heating reaction, then carrying out centrifugal separation treatment, and drying the obtained cryolite precipitate; adding sodium metaaluminate slurry into the fluorine-containing supernatant, and obtaining defluorination filtrate by treatment; adding a sulfuric acid solution into the defluorination filtrate, carrying out neutralization reaction, then carrying out vacuum evaporation on the reaction mixture containing ammonium sulfate, carrying out centrifugal separation treatment after cooling, drying the obtained ammonium sulfate precipitate, and obtaining ammonium sulfate product. The fluorine ion in the fluorine-containing etching waste liquid can be effectively utilized, the generated cryolite product can reach the national standard of high-molecular ratio, the fluorine ion content of the generated filtrate is less, so that the filtrate can enter the synthesis of ammonium sulfate, and no waste liquid is generated in the process.

The invention discloses application of fluorine-containing mixed gas in removal of crystal water in fluorinated metal salt, the fluorine-containing mixed gas composed of fluorine gas and nitrogen gas is used as a working atmosphere, and the side reaction between the removed water and the fluorinated metal salt is effectively inhibited through the strong oxidizing property of the fluorine gas. According to the method, the problem of oxidation or hydrolysis easily occurring in the inert atmosphere is avoided, the efficient and stable dehydration process is achieved, the purity, stability and efficiency are remarkably improved, and a reliable solution is provided for industrial application of the fluorinated metal salt.

The invention belongs to the technical field of chemical product preparation, and particularly relates to a method for efficiently separating and purifying aluminum fluoride silicon slag and preparing white carbon black. Dropwise adding the ammonium fluoride solution into the aluminum fluoride silicon slag solution, then heating and stirring, then adding melamine and formaldehyde as dispersing agents, filtering after the reaction is finished, and filtering by adopting a carbon fiber membrane to obtain a filter cake which is high-purity aluminum fluoride and a filtrate which is an ammonium fluosilicate solution for later use; then slowly dripping the ammonium fluosilicate solution into the ammonia water solution, and maintaining the pH value of the reaction solution at 9.3-9.4; and after the reaction is finished, carrying out solid-liquid separation and drying to obtain the white carbon black. When the white carbon black is prepared, ammonia water is selected as a base solution, the white carbon black is ensured to be separated out under an alkaline condition, the purity of the prepared white carbon black is 99% or above, the specific surface area is larger than 300 m / g, the oil absorption value exceeds 250 mL / 100 g, and the fluorine ion concentration is lower than 50 ppm. The silicon slag used in the invention is derived from solid waste of aluminum fluoride prepared from fluosilicic acid, the cost is low, and the whole process is environment-friendly and is suitable for industrial-scale production and application.

The utility model discloses a purification device for anhydrous aluminum fluoride production, which relates to the technical field of anhydrous aluminum fluoride production and comprises a reaction kettle, a sliding chute is rotatably mounted in the reaction kettle, a sliding block is slidably mounted in the sliding chute, a stirring rod is rotatably inserted in the sliding block, and a second gear is fixedly mounted in the middle of the stirring rod. The reaction kettle comprises a reaction kettle body and a stirring rod, a sliding groove is formed in the reaction kettle body, a toothed plate is fixedly installed on one side of the interior of the sliding groove, a worm gear is fixedly installed at the top end of the sliding groove, a worm is rotatably installed in the reaction kettle body and meshed with the worm gear, and a forward and reverse motor is fixedly installed on one side of the reaction kettle body. Meanwhile, the sliding block drives the stirring rod to ascend and descend in the sliding groove, and a second gear in the middle of the stirring rod is meshed with a toothed plate in the sliding groove to drive the stirring rod to rotate, so that materials in the reaction kettle can be fully mixed and stirred by the stirring rod, and the materials are thoroughly contacted and fully react.

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.

[Problem] To provide a powder that comprises a lithium-ion conductive substance functioning as a protective material for a positive electrode active material, that has excellent withstand voltage characteristics, and that exhibits excellent uniformity of adhesion to positive electrode active material particles. [Solution] This fluoride powder contains, as the main ingredient, a lithium-containing metal fluoride including lithium (Li), a metal element M, and fluorine (F), and has a BET diameter d of not more than 300 nm as calculated using formula (1).　(1): d=6×103 / (ρ×S) Here, d represents the BET diameter (nm), ρ represents the true density (g / cm3) of the powder, and S represents the BET specific surface area (m2 / g) of the powder.

The invention provides a process and equipment for recovering battery-grade lithium phosphate from aluminum electrolyte, and relates to the technical field of lithium phosphate preparation, the equipment comprises a heating reaction tank, a dropwise adding mechanism, a trigger adjusting mechanism and a moving mechanism; the dropping mechanism comprises a dropper, a dropper and a piston, the left side of the dropper is communicated with the dropper, the piston is slidably connected with the inner wall of the dropper, the inner side of the dropper is slidably connected with a moving rod, and the right end of the moving rod is fixedly connected with the left side of the piston. According to the scheme, sodium phosphate is finally dropwise added into the heating reaction tank from multiple points by utilizing four groups of dropwise adding mechanisms, and the sodium phosphate can be uniformly distributed to each region of a solution in cooperation with a moving mechanism, so that sudden increase of local concentration and instant generation of a large number of lithium phosphate crystal nucleuses caused by single-point addition are avoided, and agglomeration of fine microcrystals and adsorption of impurities can be effectively reduced; the uniform growth of lithium phosphate crystals is ensured, and the product purity is improved.

Hydrofluoric acid-specific recovery system for the refining of industrial raw materials, comprising: a wastewater collection channel which receives hydrofluoric acid-containing wastewater, and an activated carbon filter system which filters out the organic substances and the oxidizing substances from the hydrofluoric acid-containing wastewater and then produces a first wastewater, and a capacitor-based deionization system which transports the ions of the first wastewater to an electrode of opposite charge and then produces a low-concentration fluorine wastewater, and also causes the ions to detach from the electrode and then produces a high-concentration fluorine wastewater, and a low-concentration collection channel which serves to receive the low-concentration fluorine wastewater, at least one filtration unit which filters the low-concentration fluorine wastewater and then produces recovery water for internal plant use, and a high-concentration collection channel.which serves to receive the highly concentrated fluorinated wastewater, and a reaction plant which produces a cryolite through a reaction of an added aluminum-containing sodium compound with the highly concentrated fluorinated wastewater.

The application provides a method for treating and recycling ternary iron-removing aluminum slag and lithium-rich aluminum electrolyte slag, and belongs to the technical field of lithium resource recycling and utilization, and comprises the following steps: preparing an aluminum sulfate solution; pretreating the lithium-rich aluminum electrolyte slag; heating and dissolving; fluorine-aluminum precipitation; evaporation and concentration; alkali impurity removal; and lithium precipitation.The application uses ternary iron-removing aluminum slag as an aluminum source and adopts an aluminum salt leaching process to treat and recycle the lithium-rich aluminum electrolyte slag, thereby solving the problem of large aluminum salt consumption, recycling the ternary iron-removing aluminum slag and the lithium-rich aluminum electrolyte slag, achieving a fluorine resource utilization rate of more than 95%, and achieving a lithium resource recycling rate of more than 96%. The prepared regenerated cryolite and battery-grade lithium carbonate both meet national standards and industry standards.The application has the advantages of simple operation, low cost, green environmental protection, high recycling rate, high social value and considerable economic benefits.

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 relates to the field of co-processing and resource utilization of fluorine- and silicon-containing solid waste, specifically disclosing a high-quality, tiered resource utilization process for fluorosilicone slag. This process uses fluorosilicone slag as raw material, sequentially undergoing alkali dissolution activation, acidification polymerization, primary defluorination crystallization, secondary deep defluorination, and salt resource recovery steps to produce washed silica, magnesium fluoride, cryolite, and sodium sulfate, while simultaneously achieving mother liquor recycling and wastewater reduction. This invention features a short process flow, closed-loop material circulation between units, and a SiO2 recovery rate of over 95% in the fluorosilicone slag. The silica, magnesium fluoride, cryolite, and sodium sulfate products meet relevant national or industry standards, achieving high-quality, tiered resource utilization and overall wastewater reduction for fluorosilicone slag.

The application discloses a method for recycling and utilizing a major repair slag, which comprises the following steps: reacting the major repair slag with a certain amount of calcium chloride and a small amount of hydrogen peroxide under a pressurized condition, so that lithium elements in the major repair slag enter into a solution, and soluble fluorine ions combine with calcium ions to generate calcium fluoride products; then, a leaching residue is separated by step-by-step flotation to sequentially obtain carbon concentrate, calcium fluoride and cryolite products, and a water solution is recycled to a flotation process; and the leaching solution is prepared into a high-value lithium carbonate product by impurity removal, concentration and hydrothermal treatment. The method can recover various valuable substances in the major repair slag with low energy consumption and high value, and realizes the recycling and utilization of the major repair slag.