304results 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 relates to the technical field of aluminum electrolyte recovery, in particular to a waste aluminum electrolyte resource utilization method. The waste aluminum electrolyte resource utilization method comprises the following steps that waste aluminum electrolyte and a reactant are subjected to a reaction in a closed container, a product obtained after the reaction is completed is washed in water, then first solid-liquid separation is carried out to obtain a solid, aluminum fluoride is obtained after drying, and aluminum fluoride is obtained after second solid-liquid separation is carried out. The reactant is selected from one or two of anhydrous aluminum chloride and polyaluminum chloride, and the reaction temperature is not lower than 200 DEG C. By utilizing the physical characteristic that the melting point of the reactant is higher than the boiling point, the reactant forms a solid phase-liquid phase-gas phase three-phase coexistence system in a closed space at the temperature higher than the melting point and the boiling point, so that the reactant can more efficiently perform molecular collision and mutual diffusion at an interface, thereby accelerating the reaction rate and improving the conversion rate.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for separating and recovering silicon and aluminum elements from coal gangue. The coal gangue is used as a raw material, and efficient resource utilization of the coal gangue is realized through crushing and ball milling, high-temperature roasting activation and acid-base combined treatment. The coal gangue is subjected to high-temperature fluorination roasting by adopting an activating auxiliary agent fluorinating agent to form soluble fluosilicate (H2SiF6) and a fluorine-aluminum compound (AlF3), so that the subsequent silicon-aluminum separation is obviously promoted. The method comprises the following steps: desiliconizing through alkali treatment, leaching and converting silicon in the coal gangue into sodium silicate, and carrying out solid-liquid separation to obtain sodium silicate filtrate and aluminum-rich leaching residues; and then acid treatment is conducted on the aluminum-rich leaching residues, aluminum salt or aluminum hydroxide is prepared, and finally efficient separation of silicon and aluminum is achieved. According to the method, through high-temperature activation roasting, the normal-pressure alkaline leaching desiliconization effect is improved, the acid extraction aluminum efficiency is remarkably improved, the advantages of an acid method and an alkaline method are effectively combined, and the problems that coal gangue resources are difficult to utilize and the resource recovery rate is low are solved.

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.

The present invention relates to a method for comprehensive recovery and treatment of lithium-containing overhaul slag and carbon slag. The preparation process is: firstly, the overhaul slag or carbon slag is ball-milled into powder, and the fineness is greater than 200 meshes; sodium hydroxide solution is prepared, and the concentration is 3%-15%, and the ground powder is added to the sodium hydroxide solution, and the solid content is controlled to be 3%-10%; stirring at 60℃-90℃ for 2h-5h; filtering to obtain filter residue and filtrate, and carbon dioxide is introduced into the filtrate under stirring conditions for carbonization to obtain cryolite slurry, and cryolite and sodium carbonate solution are obtained by filtration and separation; the filter residue is subjected to secondary alkaline leaching with calcium hydroxide slurry, and the filter residue and filtrate are obtained by filtration and separation, and the filter residue is sent to a cement plant as a raw material for making cement, and the filtrate is added to the above sodium carbonate solution to precipitate lithium to obtain lithium carbonate, so as to realize the comprehensive recovery and utilization of lithium, sodium, aluminum and fluorine in the overhaul slag / carbon slag. The comprehensive recovery rates of lithium and fluorine are 85% and 80% respectively.

A halide material producing method according to the present disclosure includes (A) subjecting a material mixture containing a first compound containing Li, M1, and X1 and a second compound containing M2 to mechanochemical treatment, wherein each of M1 and M2 represents one type of element selected from a metal element and a metalloid element, and X1 represents at least one selected from the group consisting of F, Cl, Br, and I.

The present invention provides a method for treating a waste aluminum electrolyte containing calcium and a method for preparing aluminum fluoride. The method for treating the waste aluminum electrolyte containing calcium mainly comprises first reacting the waste aluminum electrolyte with potassium nitrate and a soluble aluminum salt to form a soluble calcium salt, filtering to remove most of the calcium therein at one time; then reacting with a calcium complexing agent to remove the calcium therein for a second time, and removing the calcium element in the waste aluminum electrolyte containing calcium by a two-step method to obtain a low-calcium electrolyte, wherein the calcium content does not exceed 0.5%. The present invention also provides a method for preparing aluminum fluoride, using the above-mentioned low-calcium electrolyte and aluminum sulfate as raw materials, preparing aluminum fluoride by a high-temperature calcination method, and the sulfate content in the aluminum fluoride does not exceed 0.6%.

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 invention belongs to the technical field of aluminum electrolysis waste treatment, and particularly relates to a method for green recovery of aluminum electrolysis waste. The method comprises the following steps: mixing and roasting aluminum electrolysis waste, aluminum-containing waste and sulfuric acid to prepare modified waste; the modified waste is smashed and stirred, and filter residues A and filtrate A are filtered and separated out; removing impurities from the filtrate A to obtain filter residues B and filtrate B; reacting the filtrate B with water-soluble carbonate or phosphate to prepare a lithium product; mixing and roasting the filter residue A, the filter residue B and a silicon-containing substance to generate aluminum oxide and silicon tetrafluoride gas; dissolving the aluminum oxide through hydrochloric acid, and reacting the silicon tetrafluoride gas with an aluminum chloride solution to form silicon tetrachloride gas and aluminum fluoride; the silicon tetrachloride gas is combusted to generate hydrogen chloride gas and silicon dioxide particles, and the hydrogen chloride gas is converted into a hydrochloric acid solution through water absorption. According to the method, recycling of aluminum and lithium resources in the aluminum electrolysis waste is effectively achieved, by-products are converted into valuable chemical substances, and resource recycling is promoted.

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 belongs to the technical field of aluminum electrolysis waste recovery treatment, and particularly relates to a method for efficiently recovering aluminum electrolysis waste through an ion recombination technology. The method comprises the following steps: crushing the aluminum electrolysis waste, mixing with the aluminum-containing waste and sulfuric acid, roasting and modifying; mixing and stirring the modified waste and water, and filtering; carrying out impurity removal and concentration on the filtrate, and adding carbonate or phosphate to initiate a lithium precipitation reaction; mixing the filter residue and the filtrate precipitate with an alkaline solution, carrying out an alkaline leaching reaction to prepare a sodium metaaluminate mixed solution, and washing the filter residue with water to obtain a sodium fluoride solution; introducing carbon dioxide into the mixed solution or adjusting the pH value to 10-12 to obtain an aluminum hydroxide precipitate and a sodium carbonate solution; the sodium fluoride solution reacts with ammonia water to prepare an ammonium fluoride solution and sodium hydroxide, ammonium fluoride is used for preparing high-purity aluminum fluoride, and the sodium hydroxide solution is recycled. According to the method, valuable elements such as aluminum, lithium and fluorine in the aluminum electrolysis waste can be efficiently recycled, cyclic utilization of resources is promoted, and environmental pollution is effectively reduced.

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 relates to an all-substance recycling method for preparing high-quality cryolite by using a waste electrolyte alkaline process, which adopts CO2 to adjust the pH value of a leaching solution and realizes the recovery of all substances of fluorine, aluminum and sodium in the electrolyte. Sodium hydroxide is recycled through causticization reaction, so that the production cost is reduced. Calcium oxide and carbon dioxide are recycled through a calcium carbonate calcining method, and recycling of all substances is achieved. The method solves the problems that in the prior art, a large amount of hydrogen fluoride harmful gas is generated in the acid leaching process, and the content of impurity elements in leachate is high, the prepared cryolite product is high in purity, and the cryolite yield and the cryolite molecule ratio are high by taking fluorine, aluminum and sodium elements as references.

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 belongs to the technical field of aluminum electrolysis waste recovery treatment, and particularly relates to a comprehensive utilization method for aluminum electrolysis waste. The method comprises the following steps: after crushing the aluminum electrolysis waste, reacting the crushed aluminum electrolysis waste with an alkaline solution to generate a mixed solution containing a sodium metaaluminate component and filter residues A; washing the filter residue A for multiple times, and extracting a sodium fluoride saturated solution and a filter residue B; heating and evaporating the mixed solution to separate out sodium fluoride; the pH value of the solution is adjusted through carbon dioxide, and a high-purity aluminum hydroxide and sodium carbonate solution is prepared; separating the washed mixed solution by adopting an electrochemical method to obtain a hydrogen fluoride / ammonium fluoride solution and a sodium hydroxide / sodium carbonate / sodium bicarbonate solution; reacting the filter residue B with dilute acid to prepare a lithium-containing solution, purifying and concentrating, adding sodium carbonate to precipitate lithium to prepare a lithium carbonate product, and reacting aluminum hydroxide with hydrogen fluoride to prepare high-purity aluminum fluoride. According to the method, comprehensive recovery of the aluminum electrolysis waste is achieved, environmental pollution is effectively reduced, and the utilization rate of resources is increased.

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 relates to an electrolytic aluminum waste cathode carbon resource recycling method which comprises the following steps: S1, mixing aluminum electrolysis waste cathode carbon with aluminum salt, and carrying out dry ball milling to obtain a ball milling material; s2, the ball-milled material is leached with an acid solution and filtered, and first-section leached residues and first-section leached liquid are obtained; s3, mixing the first-stage leaching residues with solid alkali, and roasting to obtain a sintered material; washing and filtering the sintered material to obtain second-stage filtrate and filter residues, and drying the second-stage filter residues to obtain a carbon product; and S4, adding the second-stage filtrate into the first-stage leachate until the pH value is 4.5-7.5, aging, filtering to obtain a third-stage leachate and third-stage filter residues, and roasting the third-stage filter residues to obtain an aluminum-fluorine product. According to the method, the waste cathode carbon is leached in the aluminum salt low-acid environment, the reaction environment is milder, and meanwhile the leaching efficiency is not reduced. And through further low-temperature alkali fused salt roasting, fluoride in the waste cathode carbon is removed, and the purity of the obtained carbon product is high.

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 preparation method of a high-purity potassium hexafluoroaluminate crystal, which comprises the following steps: (1) dissolving aluminum nitrate and / or a hydrate thereof in water to obtain an aluminum nitrate solution; dissolving potassium fluoride in water to obtain a potassium fluoride solution; and (2) mixing and stirring the aluminum nitrate solution prepared in the step (1) and the potassium fluoride solution to react, and then standing and aging to obtain the potassium hexafluoroaluminate crystal. The potassium hexafluoroaluminate crystal is prepared by taking aluminum nitrate and potassium fluoride as raw materials in a simple solution mixing mode, the high-purity potassium hexafluoroaluminate crystal can be obtained by controlling the reactant proportion and the mixing mode, the preparation method is simple, the raw materials are safe, the cost is low, the product does not need to be further purified, and the method is suitable for industrial production. The method is suitable for industrial mass production of high-purity potassium hexafluoroaluminate crystals.

The invention relates to the technical field of positive electrode precursors, in particular to a method for preparing a sulfate solution for a precursor by using a cobalt nickel hydroxide intermediate product and application of the sulfate solution. Performing acid leaching on the intermediate product, and then adding a flocculating agent to obtain a cobalt-nickel-manganese mixed solution and manganese slag; extracting the cobalt-nickel-manganese mixed solution and P507-C272, and reversely extracting a loaded organic phase to obtain a crude manganese sulfate solution; performing P204 impurity removal on the raffinate, recovering cobalt by using P507 to obtain a cobalt sulfate solution, and performing C272 nickel-magnesium separation to obtain a nickel sulfate solution; manganese slag is subjected to reduction leaching to obtain reduction leaching liquid, and then the reduction leaching liquid is mixed with a sodium carbonate solution to remove iron to obtain iron-removed liquid; mixing the iron-removed solution with the crude manganese sulfate solution, and removing calcium and magnesium to obtain a calcium-magnesium-removed solution; mixing the calcium and magnesium removed solution with an aluminum source to remove fluorine to obtain a fluorine removed solution; and mixing the fluorine-removed solution with sulfide to remove copper and zinc, adding alkali liquor to obtain a heavy-removed solution, and treating the heavy-removed solution with modified resin to obtain a refined manganese sulfate solution. The method is high in manganese recovery rate and low in treatment cost.

The invention discloses a method for producing cryolite from overhaul slag, which comprises the following steps: S1, grinding the overhaul slag, mixing with a treating fluid, adding sodium hydroxide and a calcium agent, heating, stirring, dissolving out, and filtering to obtain a filtrate A; s2, introducing carbon dioxide gas into the filtrate A until no precipitate is generated, and then filtering to obtain a solid, namely cryolite; the calcium agent is selected from one or more of calcium oxide and calcium hydroxide, and the treating fluid comprises water and the pH gt of the filtrate A; 10. The method for producing cryolite from overhaul slag provided by the invention has the effects of no need of adding fluoride, low cost and simple process.

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.

The invention provides a method for preparing cryolite from aluminum electrolysis fluorine-containing waste, and relates to the technical field of harmless treatment and resource utilization of aluminum electrolysis dangerous waste residues. The method comprises the following steps: S1, carrying out wet ball milling on the fluorine-containing waste, and then adding into a reaction system to form slurry of which the upper layer is a floating object and the lower layer is a solution; taking the solution, pressurizing and carrying out alkaline leaching to obtain a fluorine-aluminum precursor, carrying out size mixing on the fluorine-aluminum precursor, and adding a reaction accelerator to obtain fluorine-aluminum precursor slurry; s2, the fluorine-aluminum precursor slurry enters from the upper end of an absorption tower and flows from top to bottom, hydrogen fluoride gas enters from the lower end of the absorption tower and flows from bottom to top, and the fluorine-aluminum precursor slurry and hydrogen fluoride gas flow reversely for mass transfer reaction to obtain regenerated cryolite slurry; and S3, carrying out heat preservation crystallization and calcination on the regenerated cryolite slurry to obtain the regenerated cryolite. According to the method, the fluorine-aluminum precursor can be converted into the high-purity cryolite, the high-valued process of the overhaul slag and the carbon slag in the harmless treatment and comprehensive utilization process is achieved, and remarkable economic benefits are generated.

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