417 results about "Aluminum fluoride" patented technology

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

The invention relates to the technical field of 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 technical field of battery material preparation, and particularly relates to a coated negative electrode material as well as a preparation method and application thereof. The coated negative electrode material comprises a porous carbon skeleton and a carbon coating layer coating the porous carbon skeleton, the porous carbon skeleton is provided with a plurality of holes; a silicon layer and a functional layer are attached to the surfaces of part of the holes; the silicon layer comprises silicon, the functional layer comprises a functional material, and the functional material comprises lithium aluminum fluoride. The coated negative electrode material provided by the invention has the properties of low expansion, high lithium ion conduction, few byproducts and the like, and is suitable for a solid battery; the battery energy density is ensured, and the problems that an effective lithium ion path cannot be formed due to contact failure of an active substance caused by high volume expansion of a silicon-based material in the circulation process and contact failure of the active material and a solid electrolyte in a solid-state battery, and performance degradation is caused by negative electrode side polarization increase in the circulation process are solved.

The invention discloses a polybenzimidazole modified ion exchange membrane as well as preparation and application thereof. The polybenzimidazole modified ion exchange membrane comprises a polybenzimidazole-containing porous base membrane, the surface of the porous base membrane is grafted with a sulfonic acid modified layer, and the outer surface of the sulfonic acid modified layer is coated with an aluminum fluoride layer. The preparation method of the membrane comprises the following steps: immersing a polybenzimidazole-based membrane into an ammonium acetate aqueous solution for reaction, taking out the base membrane after the reaction, and drying to obtain a pretreated base membrane; immersing the pretreated base membrane into a sulfonic acid group grafting solution, heating for reaction, cleaning the base membrane after the reaction, and drying to obtain a sulfonic acid modified base membrane; and immersing the sulfonic acid modified base membrane into an ethanol solution of aluminum fluoride for reaction, taking out the membrane after the reaction, cleaning and drying to obtain the membrane. The membrane can be used for assembling a flow battery. According to the invention, the problem that a sulfonic acid modified layer is incompatible with metal fluoride is overcome, and a proper combination of a sulfonating agent and metal fluoride is screened, so that the high-performance ion exchange membrane which can be used for a flow battery is successfully obtained.

The invention provides a method for preparing aluminum hydroxyl fluoride and aluminum fluoride from fluorine-containing waste, and relates to the technical field of solid waste resource utilization. According to the method, the fluorine-containing waste is leached through the aluminum chloride-diluted hydrochloric acid mixed solution, acid-insoluble impurities are removed through solid-liquid separation, the pH value of the leaching solution is adjusted to 3.5-6, the pH value is the generation end point of aluminum hydroxyfluoride, the fluorine element is efficiently settled through aging, alkali-insoluble impurities are removed through solid-liquid separation, and the aluminum hydroxyfluoride is obtained. And washing the obtained aluminum hydroxyfluoride crude product with an aluminum chloride aqueous solution, dissolving a small amount of sodium salt in the solution, and removing the sodium salt through solid-liquid separation to obtain a pure aluminum hydroxyfluoride product. According to the method provided by the invention, the fluorine element in the fluorine-containing waste can be efficiently recycled, sodium-containing impurities are effectively removed, and the obtained aluminum hydroxyfluoride is high in purity. Moreover, the method provided by the invention is simple to operate and simple in process, and efficient resource utilization of the fluorine-containing waste is realized.

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 relates to a positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an electric device. The positive electrode material comprises a positive electrode base material, a carbon coating layer and an aluminum fluoride coating layer, the positive electrode base material is coated with the carbon coating layer, and the carbon coating layer is coated with the aluminum fluoride coating layer; wherein the positive electrode base material is selected from lithium manganate; wherein the aluminum fluoride coating layer is a discontinuous coating layer. The positive electrode material has excellent high-temperature cycle performance and also has excellent rate capability and capacity.

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

Forming a protective coating ex situ in an atomic layer deposition process to coat one or more chamber components subsequently installed in a reaction chamber provides a number of benefits over more conventional coating methods such as in situ deposition of an undercoat. In certain cases the protective coating may have a particular composition such as aluminum oxide, aluminum fluoride, aluminum nitride, yttrium oxide, and / or yttrium fluoride. The protective coating may help reduce contamination on wafers processed using the coated chamber component. Further, the protective coating may act to stabilize the processing conditions within the reaction chamber, thereby achieving very stable / uniform processing results over the course of processing many batches of wafers, and minimizing radical loss. Also described are a number of techniques that may be used to restore the protective coating after the coated chamber component is used to process semiconductor wafers.

The invention discloses a lithium iron manganese phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries, the lithium iron manganese phosphate positive electrode material at least comprises lithium iron manganese phosphate particles and a coating layer coating the lithium iron manganese phosphate particles; the raw material of the coating layer comprises an aluminum fluoride embedded poly (ethylenedioxythiophene)-lithium polystyrene sulfonate compound. And the coating layer can be used as a physical barrier to form dynamic interface protection, so that dissolution of manganese and erosion of electrolyte are directly inhibited, and side reaction between the electrolyte and the positive electrode material is reduced. Meanwhile, a more flexible transmission channel is provided for lithium ions and electrons, the conductivity of the positive electrode material is enhanced while the transmission efficiency of the lithium ions is improved, and the lithium manganese iron phosphate positive electrode material with stable structure, high rate capability and cycling stability is obtained.

The utility model discloses a material drying system, and particularly relates to an aluminum hydroxide particle size-controllable drying system for aluminum fluoride production, which is structurally characterized in that a discharge port of an aluminum hydroxide feeder is connected with a feed port of an airflow drying pipe connected with hot air, and a discharge port of the airflow drying pipe is communicated with a feed port of a primary cyclone; a dust outlet in the upper portion of the first-stage cyclone is connected with the second-stage cyclone, a discharge port of the first-stage cyclone is connected with the filter sieve, a discharge port of the filter sieve is connected with the cooler, an air inlet of the cooler is connected with the fluidization fan, a dust outlet in the upper portion of the cooler is connected with the second-stage cyclone, and a discharge port of the cooler is connected with the aluminum hydroxide finished product bin. And a discharge hole of the second-stage cyclone is connected with the fine material bin. According to the utility model, the problems of high loss, low yield, easiness in blockage of the fluidized bed and poor product quality in the aluminum fluoride production process caused by overlarge or oversmall aluminum hydroxide granularity are solved, and the yield and the quality of the product are improved.

The invention relates to the field of packaging materials, and particularly discloses a degradable environment-friendly electric insulation plastic packaging bag and a preparation method thereof. The degradable environment-friendly electric insulation plastic packaging bag is prepared from the following raw materials in parts by weight: 100 parts of polylactic acid, 1-4 parts of organic zirconium phosphate, 2-5 parts of hydrophobic modified cellulose nanocrystals, 4-10 parts of polyimide / aluminum fluoride composite nanofibers, 1-3 parts of a dispersing agent, 1-4 parts of an antioxidant, 3-5 parts of inorganic filler, 1-3 parts of a slipping agent, 1-3 parts of an antistatic agent and 3-5 parts of a flame retardant. The packaging bag can be used for objects with high requirements for electrical insulation, has high electrical insulation capacity at high temperature, and is high in transparency and mechanical property.

The invention relates to the technical field of waste water circulation, in particular to a centrifugal waste water recycling device based on aluminum fluoride production, which comprises a shell, an impeller I and a screen drum, the impeller I is fixedly mounted in the screen drum, the screen drum is rotatably mounted in the shell, and a separation assembly is movably mounted in the shell. And the separation assembly comprises a discharging barrel and a rotating rod, the discharging barrel penetrates through the side wall of the shell and is fixedly connected with the shell, and a discharging conical barrel is fixedly installed below the screen drum. Precipitated particles are driven by a spiral plate to move towards a discharging opening, waste water is further screened, in the process that the particles are conveyed by the spiral plate, the particles are collected through a groove, the particles are prevented from being washed away by waste water, the groove abuts against a conical head, and a vibration rod drives a second scraping block and a first scraping block to knock and clean the inner wall of a discharging conical barrel. The particles are prevented from being attached to the interior of the discharging conical barrel, the screen barrel is cleaned through the spraying pipe from outside to inside, and screen holes of the screen barrel are prevented from being damaged.

The invention discloses a method for extracting lithium by roasting electrolyte at low temperature. The method comprises the following steps: 1, decarbonizing, crushing and sieving lithium-containing electrolytic waste residues of waste electrolyte; 2, fully mixing an electrolyte and an auxiliary material, and carrying out low-temperature roasting; 3, mixing sulfuric acid with water to obtain an acid solution; 4, after the clinker is cooled, adding the acid solution according to a certain proportion to carry out low-temperature leaching, and carrying out filter pressing on a leaching solution to obtain a first filtrate and a first filter residue; and 5, adding sodium carbonate into the first filtrate after lithium precipitation, carrying out a heating reaction by using a constant-temperature water bath kettle, and filtering, washing and drying after the reaction to obtain a finished product lithium carbonate. 6, adding the first filter residue into an acid solution, and performing auxiliary leaching, stirring and filtering by utilizing ultrasonic waves to obtain a second filtrate and a second filter residue; the second filter residue is used for extracting aluminum fluoride after being washed, and the second filtrate can be returned to the size mixing process again for cyclic utilization. According to the method, lithium can be extracted at a high recovery rate, generation of harmful substances such as hydrogen fluoride is effectively reduced, and by-products in the recovery process can be subjected to resource utilization through an innovative technology and process and are converted into products with high additional values, so that the production cost can be obviously reduced.

The invention provides a positive electrode material, a preparation method thereof and a battery, the positive electrode material comprises an inner core and a shell coating the inner core, the inner core comprises a lithium-rich manganese-based positive electrode material, and the shell comprises manganese dioxide and aluminum fluoride; the chemical formula of the lithium-rich manganese-based positive electrode material is xLi2MnO3. (1-x) LiMO2, M is transition metal, the transition metal comprises at least one of Ni, Co and Mn, and x is more than or equal to 0 and less than or equal to 1. The positive electrode material is a modified lithium-rich manganese-based positive electrode material and has relatively good structural stability and relatively low charge transfer resistance, so that the rate capability and the cycling stability of the battery can be effectively 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 a modified lithium-rich manganese-based positive electrode material and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: S1, mixing a lithium-rich manganese-based material with tungsten trioxide, and calcining for the first time to obtain an LRM-coated WO3 material; and S2, mixing the LRM-coated WO3 material with aluminum fluoride, and carrying out secondary calcination to obtain the modified lithium-rich manganese-based positive electrode material. According to the scheme, the modified lithium-rich manganese-based positive electrode material is prepared through combination of chemical bond regulation and phase structure design, the problem that the high-temperature performance of a traditional lithium-rich manganese-based material is degraded is solved, and a new thought is provided for development of a high-energy-density lithium ion battery.

The invention provides a control method for producing aluminum-silicon alloy liquid by an electro-eutectoid tank, which comprises the following steps: controlling the electro-eutectoid tank to enter a roasting stage, and obtaining the temperature of the electro-eutectoid tank corresponding to the roasting stage; when the temperature reaches a preset starting temperature, the electro-eutectoid tank is controlled to enter a starting stage; the step of controlling the electro-eutectoid tank to enter the production stage from the starting stage comprises the step of controlling the anode lifting height interval of the electro-eutectoid tank based on the voltage noise of the electro-eutectoid tank in the production stage; controlling the blanking amount of aluminum oxide and silicon dioxide based on the voltage of the electro-eutectoid tank in the production stage; the blanking amount of aluminum fluoride is controlled based on the working duration of the electro-eutectoid tank in the production stage; controlling the voltage corresponding to the suction amount of the silicon-aluminum alloy liquid based on the lifting height of the anode in the electro-eutectoid tank in the production stage; and controlling the voltage of the electro-eutectoid tank to be maintained in a preset range based on the voltage corresponding to the anode lifting height, the blanking amount of the aluminum oxide and the silicon dioxide, the blanking amount of the aluminum fluoride and the suction amount of the silicon-aluminum alloy liquid, so as to obtain the silicon-aluminum alloy liquid.

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

The invention provides high-transparency rare earth doped fluoride glass and a preparation method thereof, and belongs to the technical field of glass. The calcium fluoride ensures high transparency and chemical stability, the magnesium fluoride improves the ultraviolet transmittance and the mechanical strength, and the barium fluoride optimizes the melting fluidity and the rare earth doping uniformity; aluminum fluoride is added to inhibit crystallization and enhance uniformity, the rare earth element realizes optical function regulation and control, and ammonium fluoride provides a fluorine source and reduces impurities; in a preparation link, quick lime is dedusted and then reacts with pure water in proportion, impurities in a calcium nitrate solution are removed by hydrogen peroxide, uniform growth of calcium carbonate crystal nucleuses is controlled by ammonia water and carbon dioxide, and calcium fluoride is synthesized by hydrofluoric acid in proportion and dried at low temperature after plate-frame pressure filtration and purification; after the raw materials are refined through ball milling, the melting temperature is controlled in stages, impurities, reaction integrity and a microstructure are accurately controlled in the whole process, and finally the high-transparency functional glass is prepared.

A battery is provided comprising a coated sintered cathode. The coated sintered cathode comprises at least one of lithium cobalt oxide (LiCoO2) or NMC (LiNi(1-x-y)MnxCoyO2). The coated sintered cathode also comprises a coating layer. The coating layer comprises at least one of aluminum oxide (Al2O3), aluminum fluoride (AlF3), zinc oxide (ZnO), magnesium oxide (MgO), titanium dioxide (TiO2), lanthanum oxide (La2O3), zirconium oxide (ZrO2), gallium oxide (Ga2O3), magnesium fluoride (MgF2), molybdenum trioxide (MoO3), selenium (Se), or phosphorous pentoxide (P2O5). The coating layer is coated on the sintered cathode by atomic layer deposition. The sintered cathode may form a cathode-electrolyte interface inside the battery, and the coating layer may be positioned at the cathode-electrolyte interface.

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

The invention belongs to the technical field of iron runner castable, and discloses a multi-scale whisker reinforced and toughened cement-free combined iron runner castable and a preparation method of the multi-scale whisker reinforced and toughened cement-free combined iron runner castable. The raw materials of the non-cement-bonded castable for the iron hook comprise high-aluminum aggregate, silicon carbide aggregate, silicon carbide micro powder, aluminum oxide micro powder, a first binding agent, a second binding agent, a carbon source and an antioxidant, and explosion-proof fibers and water are additionally added, the first binding agent is prepared by heating silicon dioxide micro powder, graphite fine powder, polyvinyl alcohol, a silane coupling agent and water to react and then drying, and the second binding agent is prepared by mixing silicon dioxide micro powder, pseudo-boehmite micro powder, boric acid micro powder, acrylamide and aluminum fluoride micro powder. The silicon carbide whisker, the aluminum borate whisker and the mullite whisker are generated in different areas and at different temperatures in the iron runner castable through two binders with different components, so that multi-scale strengthening and toughening as well as improvement of oxidation resistance and erosion resistance are realized.

The invention discloses a flame-retardant polyvinyl chloride composite board and a processing method thereof, and relates to the technical field of polyvinyl chloride boards. The flame-retardant polyvinyl chloride board is prepared by adding a mullite whisker-metal organic framework composite material into a composite board matrix. Firstly, aluminum oxide, silicon dioxide and aluminum fluoride trihydrate are used for preparing mullite whiskers, and the mullite whiskers are single-crystal fibrous materials with many pores, large specific surface area, high temperature resistance and high strength. Preparing sol by using the mung bean polypeptide, and modifying the mullite whisker by using the sol to obtain the mullite whisker modified by the mung bean polypeptide. Zinc nitrate hexahydrate and dimethylimidazole are added to assist growth of a metal organic framework composite material on mullite whiskers, so that the strength and flame retardance of the flame-retardant polyvinyl chloride composite board are further improved.

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 discloses a modification and grain refiner for Al-Si series die-casting aluminum alloy, which comprises the following components in mass percentage: 60-80% of rare earth aluminum alloy powder, 19-39% of auxiliary agent A, and 0.1-1.0% of auxiliary agent B; in the rare earth aluminum alloy powder, rare earth elements account for 2-20% of the total amount, the total amount of Fe and Si is ≤0.1%, and the balance is aluminum; the rare earth element is any one or a combination of two of La, Ce, Y, Er, and Sc; the auxiliary agent A comprises light calcium carbonate, sodium cryolite, potassium cryolite, sodium fluorosilicate, lithium fluoride, potassium fluoride, sodium fluoride, aluminum fluoride, sodium chloride, potassium chloride, potassium fluoroborate, magnesium chloride, and hexachloroethane; the auxiliary agent B comprises polyethylene glycol and stearamide. The modification and grain refiner obtained by mixing rare earth aluminum alloy powder, additive A and additive B can be evenly dispersed in the aluminum alloy melt to play the role of long-term modification and grain refinement as well as refining and dehydrogenation.

The invention discloses a preparation method of a large-particle single crystal alpha-alumina material. The preparation method comprises the following specific operation steps: step 1, grinding and mixing boric acid or aluminum fluoride with industrial alumina according to a certain mass ratio to obtain M1; step 2, carrying out pressure molding on the M1 to obtain M2; 3, the M2 is calcined, the calcination temperature is 1200-1600 DEG C, and the calcination time is 4-10 h; and step 4, carrying out crushing treatment on the calcined sample, and carrying out ball milling to obtain the large-particle single crystal alpha-aluminum oxide. The average particle size of the alpha-aluminum oxide prepared by the method is 40-100 microns, and the alpha-aluminum oxide is short in preparation time, simple in process, convenient to operate, low in cost and suitable for large-scale production.

The aluminum fluoride coated nano silicon material is prepared from nano silicon powder, aluminum nitrate nonahydrate, ammonium fluoride, absolute ethyl alcohol and deionized water, and an aluminum fluoride coating layer and a nano silicon negative electrode material are compounded to form an aluminum fluoride coated nano silicon material structure. The aluminum fluoride coating layer on the surface can be converted into a fast ion conductor in the battery circulation process, so that the lithium ion diffusion rate is increased, and migration of lithium ions between the nanometer silicon negative electrode and the electrolyte is promoted. Under the coating protection effect of the coating layer, the volume expansion of the nano-silicon material is improved, the voltage attenuation speed is slowed down, the cycling stability is greatly improved, the cycling performance of the nano-silicon negative electrode material is improved, and silicon particle breakage, material pulverization and falling off from a pole piece are avoided. The coating amount of the aluminum fluoride coating layer is compared, and the optimal coating amount is given. The method has the advantages of low cost and high controllability.