76 results about "CHLORIDE HEXAHYDRATE" patented technology

The invention discloses a porous olivine tundish dry material and a preparation method thereof, and belongs to the technical field of tundish dry material processing, the porous olivine tundish dry material specifically comprises the following raw materials by mass: 80-100 parts of a composite sand material, 2-3 parts of silicon powder, 10-15 parts of a composite binder, 15-20 parts of modified aerogel and 4-7 parts of a sintering promoter, heat-resistant whiskers are prepared through a molten salt method, and the porous olivine tundish dry material is prepared through a hot melt method. The preparation method comprises the following steps: preparing a composite binder from a dry tundish material, carrying out centrifugal spinning to obtain modified zirconium oxide fibers with a hollow structure, and further preparing modified aerogel from the modified zirconium oxide fibers, aluminum chloride hexahydrate, hydroxyethyl cellulose and epoxy chloropropane, so that the high temperature resistance and mechanical properties of the cured dry tundish material are improved; and the mechanical property is also improved.

The invention discloses a flexible lanthanum zirconate-alumina fiber membrane as well as a preparation method and application thereof, and belongs to the technical field of inorganic nonmetal ceramic fiber materials. The preparation method comprises the following steps: dissolving zirconium oxychloride octahydrate, lanthanum chloride heptahydrate and aluminum chloride hexahydrate into absolute methanol, sequentially adding acetylacetone and triethylamine, stirring, and drying under reduced pressure to obtain a zirconium-lanthanum-aluminum polymer precursor containing triethylamine hydrochloride; soaking the zirconium-lanthanum-aluminum polymer precursor containing triethylamine hydrochloride in acetone, standing, filtering, concentrating under reduced pressure, and drying to obtain a zirconium-lanthanum-aluminum acetylacetone polymer precursor; the preparation method comprises the following steps: preparing a spinning solution from a zirconium-lanthanum-aluminum acetylacetone polymer precursor, absolute methanol serving as a solvent and polyoxyethylene serving as a spinning aid, and carrying out electrostatic spinning on the spinning solution to obtain a lanthanum zirconate-aluminum oxide precursor fiber membrane; and performing heat treatment on the lanthanum zirconate-aluminum oxide precursor fiber membrane to obtain the flexible lanthanum zirconate-aluminum oxide fiber membrane. According to the preparation method, acetylacetone is added into zirconium oxychloride, lanthanum chloride and aluminum chloride for coordination to form a linear zirconium-lanthanum-aluminum acetylacetone polymer, so that the technical problem that lanthanum zirconate long fibers with high strength and good flexibility are difficult to obtain is solved.

The invention relates to the technical field of catalyst processing, and discloses a high-activity transition metal phosphide electrolyzed water catalyst and a preparation method thereof, and the high-activity transition metal phosphide electrolyzed water catalyst comprises the following components by weight: 1-3 parts of cobalt chloride hexahydrate; 0.5 to 1.5 parts of ruthenium trichloride; 0.5 to 1.5 parts of iridium chloride (III) hydrate; 1-2 parts of copper sulfate pentahydrate; 2 to 4 parts of sodium hypophosphite; 1 to 2 parts of urea; 1 to 2 parts of glucose; 1-2 parts of sodium sulfide nonahydrate; 0.5 to 1 part of crystalline aluminum chloride; 50 to 100 parts of deionized water; and 0.1 to 0.5 part of hexadecyl trimethyl ammonium bromide. By introducing the plasma auxiliary treatment technology, the electronic structure of the catalyst is optimized, the conductivity and stability of the catalyst are improved, and the efficiency and durability of hydrogen production through water electrolysis are enhanced.

The invention discloses a salicylic acid anchored hydrotalcite-bentonite composite material based on salt lake bischofite as well as a preparation method and application thereof, and belongs to the technical field of preparation and application of heavy metal adsorbents. According to the invention, salt lake bischofite is used as a magnesium source, is purified and then is mixed with aluminum chloride hexahydrate, salicylic acid, bentonite and an alkaline reagent, and the composite material is prepared through a heating and pressurizing reaction. According to the material, bentonite serves as a substrate, magnesium-aluminum hydrotalcite grows on the surface, carboxyl, phenolic hydroxyl and other functional groups are anchored through flocculation and electrostatic adsorption, and the complexing capacity on heavy metal ions is synergistically enhanced. Compared with traditional hydrotalcite, the composite material has higher specific surface area, larger adsorption capacity and regeneration stability, and can efficiently remove lead ion pollution in water. The method realizes high-value utilization of salt lake magnesium resources, provides a novel adsorption material for heavy metal treatment, and has environmental protection benefits and application values.

The application relates to the field of fireproof bricks, and discloses a baking-free fireproof brick and a preparation method thereof. The baking-free fireproof brick comprises iron tailings, cement, fly ash, a functional additive, fine aggregate, quartz sand, a chromium aluminum phosphate binder, a water reducing agent and water. The functional additive is prepared by using aluminum chloride hexahydrate and alkaline silica sol as raw materials, ammonium molybdate tetrahydrate as a catalyst, growing mullite whiskers on the surface of silicon carbide fibers through vacuum impregnation and heat treatment, modifying the prepared composite silicon carbide fibers through 3-(methacryloxy) propyl trimethoxysilane, and then copolymerizing the modified composite silicon carbide fibers with acrylic acid and 4-hydroxybutyl vinyl ether. The chromium aluminum phosphate binder is prepared by using aluminum hydroxide, phosphoric acid and chromium trioxide as raw materials and calcium hydroxide as a curing agent. The baking-free fireproof brick prepared through the synergistic effect of the components has high compressive strength and bending strength, small water absorption and good baking-free fireproof and heat insulation performance.

The present invention relates to the technical field of chemistry, particularly to a 2, 3, 3, 3-tetrafluoropropene preparation method, which comprises: mixing a water-soluble metal salt containing a first metal auxiliary agent and chromium chloride hexahydrate to prepare a first solution, mixing the first solution with first ammonia water, and carrying out first calcination treatment on the obtained first precipitate to obtain a first chromium salt; mixing first chromium salt with graphite and silicon dioxide to obtain a first catalyst precursor, and performing fluorination activation treatment on the first catalyst precursor to obtain a first catalyst; the method comprises the following steps: under the action of a first catalyst, reacting 2-chloro-3, 3, 3-trifluoropropene with hydrogen fluoride to obtain 2, 3, 3, 3-tetrafluoropropene. According to the method, the process route is shortened, the use of highly toxic substances is avoided, the cost is reduced, the pollution to the environment is reduced, and meanwhile, the conversion rate of HCFO-1233xf and the selectivity of HFO-1234yf are improved.

The invention discloses a preparation method of a polyaluminum chloride water purifying agent. Comprising the following steps: step 1, dissolving aluminum trichloride hexahydrate in deionized water, raising the temperature to 70-80 DEG C, slowly dropwise adding a sodium hydroxide solution, reacting for 1-2 hours, and then curing for 24 hours to obtain a polyaluminum chloride solution; and 2, adding the modified chitosan into glacial acetic acid, carrying out ultrasonic stirring for 30-40 min, raising the temperature to 70-80 DEG C, slowly adding a polyaluminum chloride solution, dropwise adding a sodium hydroxide solution, carrying out a reaction for 1-2 h, and after the reaction is completed, carrying out static curing for 24 h to obtain the polyaluminum chloride water purifying agent. The water purifying agent has the beneficial effects that the chitosan is modified and compounded with the polyaluminum chloride, so that the water purifying capability is effectively improved.

The preparation method comprises the following steps: mixing and stirring calcium chloride dihydrate, aluminum chloride hexahydrate, ethylene glycol, polyoxyethylene and formamide to obtain a clear and stable solution, cooling the solution to 0 DEG C, dropwise adding epoxypropane and gel, aging, drying wet gel, and drying to obtain the supported calcium-iron-based catalyst. A porous mayenite block is obtained after heat treatment, the porous mayenite block is ground and smashed to obtain CaO-Cal2Al14O33 powder, the molar ratio of the adding amount of calcium to the adding amount of aluminum is 24-36: 14, Fe is impregnated and loaded, the loading amount of Fe is 12-18 wt%, and the supported calcium-iron-based catalyst is prepared and used in biomass pyrolysis gasification. The porous mayenite block is used as the carrier, the dispersity of the active component iron is effectively improved, the calcium oxide content in the catalyst is controlled by controlling the calcium-aluminum ratio in the preparation process of the catalyst carrier, the carbon deposition resistance of the iron-based catalyst is effectively improved, and the H2 ratio in produced gas is increased.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst, a preparation method and application thereof. The mass ratio of the semi-metal carbon nitride and the metal organic framework MIL-53Fe is 1:10-3:10. The preparation method comprises the following steps: dissolving sodium tricyanomethanide and 1-butyl-3-methyl imidazole chloride in deionized water, and obtaining the semi-metal carbon nitride by using a thermal polymerization method; dissolving iron chloride hexahydrate and 1,4-benzenedicarboxylic acid in dimethylformamide, and then adding the semi-metal carbon nitride, and obtaining the semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst by using a hydrothermal method. The formation of the heterojunction can greatly improve the photocatalytic reduction activity of the semi-metal carbon nitride / metal organic framework MIL-53Fe on carbon dioxide.

The utility model relates to an aluminum mud recycling system which comprises an aluminum mud collecting chamber, a reaction tank, a first settling chamber and an aluminum chloride collecting chamber which are connected in sequence, an outlet of the aluminum chloride collecting chamber is connected with an evaporator which is sequentially connected with a crystallizer and a first filter, and an outlet of the first filter is further connected with an inlet of the evaporator. The other outlet of the aluminum chloride collecting chamber is connected with a polymerization chamber which is connected with a second settling chamber, and the second settling chamber is connected with the curing chamber through a second filter. The aluminum mud recycling system can be used for preparing aluminum chloride hexahydrate crystals and liquid polyaluminum chloride at the same time, and the prepared liquid polyaluminum chloride is high in purity and wide in application range.

This invention belongs to the field of tempered laminated glass technology, specifically relating to a bubble-free composite molding process for tempered laminated glass. A functional coating is also provided, which is prepared from the following components: modified silicone-acrylic emulsion, modified nano-cesium tungsten bronze, curing agent, dispersant, leveling agent, defoamer, silane coupling agent, ultraviolet absorber, film-forming aid, and deionized water. This invention utilizes the crosslinking modification of vinyltriisopropoxysilane and the grafting modification of vinylphosphonic acid to effectively improve the interfacial bonding force between the emulsion film and the glass substrate and functional fillers. Simultaneously, a modifier prepared by aminotrimethylenephosphonic acid and lanthanum chloride hexahydrate is used to modify the surface of nano-cesium tungsten bronze, solving the technical problem of easy agglomeration of unmodified nano-cesium tungsten bronze, thus laying the foundation for the high performance of functional coatings and tempered laminated glass.

The invention provides antibacterial hydrogel artificial skin and a preparation method thereof, and belongs to the technical field of 3D printing biomaterials, the antibacterial hydrogel artificial skin is prepared from the following raw materials by weight: 1-3 parts of aluminum chloride hexahydrate, 30-45 parts of water, 15-22 parts of graft modified chitosan, 8-15 parts of acrylamide, and 1-3 parts of N, N-dimethylformamide. The coating comprises the following components in parts by weight: 0.2-0.8 part of N, N '-methylene bisacrylamide, 0.5-1.5 parts of a photoinitiator, 6-12 parts of quaternized chitosan and 4-8 parts of nano-hydroxyapatite. Wherein the graft modified chitosan is prepared from the following raw materials: 5 to 10 parts of chitosan, 80 to 120 parts of acetic acid solution with the concentration of 2 percent, 0.8 to 2.5 parts of glycidyl methacrylate and 0.05 to 0.2 part of azodiisobutyronitrile. According to the application, by adopting a formula taking the grafted modified chitosan as a core, a collaborative design of multi-scale crosslinking and personalized 3D printing is formed, high mechanical strength, broad-spectrum long-acting bacteriostasis, precise form adaptation and excellent biocompatibility of the hydrogel are realized, and the clinical complex wound repair requirements are met.

The invention relates to the field of fuel and boiler systems, in particular to a coal gangue valuable element self-heating extraction system which comprises a feeding module, a crushing module, a decarburization activation module and a valuable element extraction module which are sequentially linked to form a closed loop. The feeding module adopts a belt type and spiral feeding combination; the crushing module is used for crushing the coal gangue until the particle size is below 2cm by using a jaw crusher; the temperature of the decarburization activation furnace is controlled at 750-850 DEG C, coal gangue decarburization, ash activation and rare earth calcination are achieved, flue gas is subjected to heat exchange to produce 300-450 DEG C high-temperature steam for energy supply, and bottom slag is ground to 200 meshes or below for standby application. The valuable element extraction comprises a magnetic separation iron removal sub-module, a hydrochloric acid leaching sub-module and the like, and the system adopts gradient energy utilization (high-temperature steam, medium-temperature steam and low-temperature steam are respectively used for acid leaching, aluminum chloride hexahydrate crystallization, extraction and white carbon black preparation). The system realizes the utilization of all components such as carbon and aluminum in the coal gangue, produces high-value products such as metal gallium and rare earth oxides, realizes self-heating to reduce energy consumption, is matched with an environment-friendly treatment unit, is adaptive to different coal gangue components, and is good in energy efficiency and economical efficiency.

This invention discloses a process and coating structure for rare earth modified trivalent chromium pearl chromium plating on zinc alloys. The process includes sequentially preparing a cyanide-free copper plating layer, a cyanide-free copper-zinc alloy plating layer, a high-corrosion-resistant nickel-phosphorus alloy plating layer, a bright nickel-cobalt alloy plating layer, a pearl nickel plating layer, a rare earth modified trivalent chromium pearl chromium plating layer, and an anti-discoloration protective film on a zinc alloy substrate. The rare earth modified trivalent chromium pearl chromium plating process is as follows: chromium chloride hexahydrate 90-130 g / L, potassium chloride 90-160 g / L, ammonium chloride 90-160 g / L, ammonium bromide 18-28 g / L, ammonium formate 40-60 g / L, boric acid 45-65 g / L, rare earth additives 8-12 mL / L, leveling agent 2-4 mL / L, accelerator 1-3 mL / L, plating bath pH 2.5-3.2, plating bath temperature 25-35℃, and cathode current density 8-16 A / dm². The rare earth additives have a synergistic effect on improving the performance of trivalent chromium plating solution. No rust was observed on the surface of the plated parts after undergoing a neutral salt spray test for 132 hours according to GB / T 10125–2021 standard.

The invention relates to the field of concrete, and discloses anti-crack and anti-seepage concrete and a preparation method thereof, the anti-crack and anti-seepage concrete comprises cement, silica fume, fly ash, fine aggregate, modified steel fiber, modified sepiolite fiber, a water reducing agent and water; the modified steel fiber is prepared by pretreating the surface of the steel fiber by using a sodium hydroxide solution, dipping in a modified glue solution and thermally curing; the modified glue solution is prepared by respectively providing a silicon source and an aluminum source by using tetraethoxysilane and aluminum chloride hexahydrate as raw materials, preparing silica sol and aluminum sol by using ethanol and water, and mixing the silica sol and the aluminum sol; the modified sepiolite fibers are prepared in the mode that gamma-aminopropyltriethoxysilane is used for conducting surface grafting pretreatment on the sepiolite fibers, and then graphene oxide is adsorbed to the surfaces of the sepiolite fibers through an electrostatic self-assembly method. The prepared concrete is high in compressive strength and breaking strength and good in anti-cracking and anti-seepage performance.

The invention discloses an activated aluminum oxide modified activated carbon fiber felt and a preparation method and application thereof, and belongs to the technical field of adsorption materials, and the preparation method comprises the following steps: S1, preparing an activated activated carbon fiber felt; s2, adding urea and aluminum chloride hexahydrate into deionized water, stirring and dissolving, then adding the activated activated carbon fiber felt, stirring and mixing uniformly, transferring into a reaction kettle for reaction, cooling, taking out, washing and drying to obtain an aluminum oxide precursor modified activated carbon fiber felt; s3, transferring the alumina precursor modified activated carbon fiber felt into a tubular furnace, performing annealing treatment in a nitrogen atmosphere, and cooling to room temperature to obtain an activated alumina modified activated carbon fiber felt; the preparation method is simple and easy to implement, the used materials are wide in source and low in cost, and the prepared activated aluminum oxide modified activated carbon fiber felt shows excellent fluorine ion removal rate and removal efficiency on a water body containing low-concentration fluorine ions and has wide application prospects.

The invention discloses a soil conditioner and a preparation method thereof, and relates to the technical field of soil improvement. The preparation method comprises the following steps: mixing diatomite with a hydrochloric acid solution, heating and stirring for reaction, performing suction filtration, washing with deionized water until filtrate is neutral, and drying and grinding to obtain purified diatomite; dissolving magnesium chloride hexahydrate, aluminum chloride hexahydrate and urea in deionized water to form a salt-urea mixed solution, adding purified diatomite for dispersion, and carrying out hydrothermal reaction, cooling, suction filtration, hot deionized water washing and drying on the turbid liquid to obtain a layered double hydroxide-diatomite composite material; the composite material is dispersed in a Tris-HCl buffer solution, dopamine hydrochloride is added under stirring for a reaction, suction filtration, deionized water washing and drying are performed after the reaction, and the soil conditioner is obtained. The modifier prepared by the invention can efficiently fix anionic and cationic heavy metals in soil, and is good in stability.

The invention discloses a flame-retardant high-temperature-resistant vehicle body film and a preparation method thereof, and relates to the technical field of high polymer materials. When the flame-retardant and high-temperature-resistant automobile body film is prepared, after 8 (aminophenyl trioxosilane) is diazotized, the diazotized 8 (aminophenyl trioxosilane) reacts with dimethyl phenyl silane to prepare azobenzene POSS; the preparation method comprises the following steps: reacting cellulose acetate with N2, N4, N6-tris (2-aminoethyl)-1, 3, 5-triazine-2, 4, 6-triamine and divinyl phosphoryl chloride in sequence to prepare modified cellulose acetate; the preparation method comprises the following steps: carrying out reaction on polyurethane, pyridine-2, 6-dicarboxylic acid and europium chloride hexahydrate to prepare modified polyurethane; and uniformly mixing the modified polyurethane, the modified cellulose acetate and azobenzene POSS, and carrying out mold pressing to form a film, so as to prepare the flame-retardant high-temperature-resistant vehicle body film. The flame-retardant and high-temperature-resistant vehicle body film prepared by the invention has excellent ultraviolet resistance, flame retardance and high-temperature resistance.

The invention discloses a Fe-doped Bi2SeO5 nano material as well as a preparation method and application of the Fe-doped Bi2SeO5 nano material. The preparation method comprises the following steps: dissolving ferric chloride hexahydrate, bismuth nitrate pentahydrate and sodium selenite according to a specific ratio by using a hydrothermal synthesis technology and taking pure water as a solvent, and stirring at the room temperature of 25 DEG C until a system is uniform, so as to obtain a precursor mixed solution of the Fe-doped Bi2SeO5 nano material; the mixed solution is subjected to a hydrothermal reaction and then is subjected to heat treatment in an air atmosphere, and the target Fe-doped Bi2SeO5 nano material is finally obtained by regulating and controlling parameters such as a precursor ratio, a hydrothermal reaction temperature, heat preservation time and heat treatment conditions through a system. The nano material is used for catalytic degradation of antibiotics in a PMS system, and has the characteristics of strong anti-interference capability, good tolerance to acid and alkali environments, remarkable catalytic effect, high stability and the like.

This invention discloses a metal-organic framework material in which sulfonic acid and carboxylic acid groups are simultaneously coordinated with chromium ions, its preparation method, and its application. Belonging to the field of crystalline materials technology, the chemical formula is [Cr(OH)(SO3)(CO2)(C6H4)], and the ligand is p-sulfobenzoic acid. It is prepared by the following steps: p-sulfobenzoic acid and chromium chloride hexahydrate are ground and mixed to obtain a premix; the premix is ​​heated to 150-250℃ and reacted for 12-144 hours; after the reaction, the product is washed with ethanol, centrifuged, and dried to obtain the chromium-based metal-organic framework material. The obtained chromium-based metal-organic framework material exhibits excellent proton conductivity, with a conductivity reaching 8.54 × 10⁻⁶. ‑3 S·cm ‑1 (98%RH).

The invention relates to a synthetic method of 3, 4-dichlorobenzonitrile, and belongs to the technical field of organic synthesis. According to the preparation method, tetramethyl silicate is creatively used as a silicon source, aluminum chloride hexahydrate is used as an aluminum source, yttrium chloride hexahydrate is used as a yttrium source / rare earth source, then based on a sol-gel method, the opportunity of adding the aluminum source and the yttrium source into a reaction solvent is controlled, and then the aluminum-yttrium doped silica sol is prepared, the preparation method comprises the following steps: adding tetramethyl silicate for the first time before dropwise adding the tetramethyl silicate into a reaction solvent, adding the tetramethyl silicate for the second time after completely dropwise adding the tetramethyl silicate into the reaction solvent, and then loading a vanadium-chromium catalyst by utilizing aluminum-yttrium doped silica sol on the basis of an impregnation method, so as to prepare the loaded catalyst. According to the present invention, the 3, 4-dichlorobenzonitrile can be well catalyzed and synthesized during the ammoxidation reaction of the 3, 4-dichlorotoluene, such that the conversion rate is high, the selectivity is good, and the excellent technical effect is achieved.

The invention discloses aluminum oxide-based high-dispersity grinding powder and a preparation method thereof, and relates to the technical field of aluminum oxide grinding powder. Comprising the following steps: step 1, adding aluminum chloride hexahydrate and aluminum nitrate nonahydrate into deionized water, adding a precipitator, a dispersant, ammonium fluoride and a functional additive, stirring at 85-95 DEG C for 3-4 hours, aging for 0.5-1.5 hours, washing and drying to obtain aluminum hydroxide powder; 2, grinding aluminum hydroxide powder and a sintering aid to obtain a raw material; and 3, calcining the raw materials in stages, and cooling to room temperature to obtain the high-dispersity grinding powder. The functional additive, the dispersing agent and other raw materials are combined with the sintering aid and a specific process to finally obtain the product; the system can effectively prevent carbonization of organic matters and inhibit abnormal growth of crystal grains, so that the dispersity and hardness of the product are remarkably improved while the crystal grain size of the product is controlled.

The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to a high-energy-density lithium battery temperature-resistant safe composite diaphragm and a preparation method thereof. According to the preparation method, aluminum chloride hexahydrate is taken as an aluminum source, a sol-gel method is combined with carbon dioxide supercritical drying to prepare an aluminum oxide composite material with an aerogel structure, and the aluminum oxide composite material is matched with nano cellulose, a polyacrylate binder and a dispersing agent to prepare coating slurry; the polypropylene base material is coated with the coating slurry to form the composite diaphragm, so that the thermal shrinkage performance of the diaphragm is reduced while the safety is ensured by using a relatively large coating thickness, and meanwhile, the high energy density is obtained.

The present invention belongs to the technical field of crystalline materials, and particularly relates to a chromium phosphonate metal organic framework material and a solvent-free preparation method and application thereof. The chemical formula is [Cr(H2BPD) 1.5 The preparation method comprises the following steps: mixing an organic ligand, p-terephthalenediphosphonic acid, with chromium chloride hexahydrate, grinding the mixture, heating the mixture, and, after completion of the reaction, spontaneously cooling the mixture to room temperature. The mixture is repeatedly washed with ethanol until the supernatant is colorless and transparent, and vacuum-dried to obtain a light green chromium phosphonate metal-organic framework material. The chromium phosphonate metal-organic framework material can be used in proton conduction.

The invention belongs to the technical field of silicon-aluminum aerogel preparation, and particularly discloses flame-retardant and low-smoke phosphorus-doped silicon-aluminum aerogel and a preparation method thereof.The method comprises the following steps that tetraethoxysilane, ethyl alcohol, deionized water and phytic acid are weighed, mixed and hydrolyzed; aluminum chloride hexahydrate, ethanol and deionized water are mixed and hydrolyzed; dropwise adding ammonia water into the silica sol, and adjusting the pH value; dropwise adding the silica sol into the aluminum sol, and stirring and mixing; after adding epoxypropane, transferring into a drying oven for gelling; aging the gel in a drying oven, replacing with absolute ethyl alcohol after aging, and performing supercritical drying after replacement to obtain the flame-retardant and low-smoke phosphorus-doped silicon-aluminum aerogel. According to the flame-retardant and low-smoke phosphorus-doped silicon-aluminum aerogel and the preparation method thereof disclosed by the invention, the silicon-aluminum aerogel prepared by the method has low heat conductivity, low heat release rate and smoke release rate, and also has excellent flame-retardant and low-smoke combustion characteristics.

The present application belongs to the technical field of solid composite propellant recycling, and particularly relates to a method for crushing waste solid composite propellant. First, a composite precipitate of iron hydroxide and aluminum hydroxide is generated by using ferric chloride hexahydrate and aluminum chloride hexahydrate, the precipitate is filtered and washed, and then is mixed with carbon nanotubes and ethanol for ball milling, and finally is calcined to obtain a nano composite grinding aid. After the nano composite grinding aid is prepared into a suspension, the waste solid composite propellant is crushed together with the suspension, and the crushed solid composite propellant particles are separated by screening. The nano composite grinding aid prepared by the present application can improve the performance of the propellant, and the crushing method is particularly suitable for combustion recycling of the waste solid composite propellant. In the combustion recycling, the combustion efficiency and energy release are enhanced, so that the recycling heat value and energy utilization rate of the propellant can be significantly improved.

The application discloses a preparation method of high-valence MOF crystal film for alcohol dehydration purification. The preparation method is as follows: a porous gamma-Al2O3 carrier is placed in deionized water, a gamma-AlOOH precursor layer is obtained through a hydrothermal reaction, and then the carrier modified with the precursor layer is placed in an aqueous solution containing 2,5-furan dicarboxylic acid and aluminum chloride hexahydrate, and is subjected to secondary growth. The application utilizes a hydrothermal method to modify the carrier, preplants a layer of gamma-AlOOH precursor on the surface of the porous gamma-Al2O3 carrier, and then obtains the MIL-160 crystal film through secondary growth. The prepared porous MOF film material has excellent stability and separation performance in an alcohol / water system, and is an ideal alcohol / water separation material.

The invention discloses a metal organic framework material with sulfonic acid and carboxylic acid simultaneously coordinated with chromium ions as well as a preparation method and application thereof, and belongs to the technical field of crystalline materials, the chemical formula is [Cr (OH) (SO3) (CO2) (C6H4)], the ligand is p-sulfobenzoic acid, and the metal organic framework material is prepared by the following steps: grinding and mixing p-sulfobenzoic acid and chromium chloride hexahydrate to obtain a premix; and heating the premix to 150-250 DEG C, reacting for 12-144 hours, washing the product with ethanol after the reaction is finished, and centrifugally drying to obtain the chromium-based metal organic framework material. The obtained chromium-based metal organic framework material has excellent proton conductivity, and the conductivity can reach 8.54 * 10 <-3 > S.cm <-1 > (98% RH).

The invention provides high-purity aluminum oxide nano powder and a preparation method thereof, and belongs to the technical field of nano material preparation. The preparation method comprises the following steps: by taking aluminum sulfate octadecahydrate and aluminum chloride hexahydrate as aluminum salts and polyethylene glycol and fumaric acid as admixtures, slowly adding an aluminum salt solution into an ammonium carbonate solution to react, washing, centrifuging, filtering, drying and sieving to obtain precursor powder, adding ethanol into the precursor powder to prepare slurry, then adding behenic acid into the slurry, and carrying out ball milling to obtain a finished product. And carrying out ball milling, sieving, drying and calcining to obtain the high-purity aluminum oxide nano powder. The prepared aluminum oxide nano powder is uniform in particle size distribution and good in dispersity, the purity is larger than 99.99%, and the requirement of the high-end aluminum oxide nano powder industry can be met.

The invention relates to the technical field of hydrotalcite materials, in particular to an efficient desulfurized titanium-based hydrotalcite-like material and a preparation method thereof. The preparation method of the efficient desulfurization titanium-based hydrotalcite-like material comprises the following steps: adding zinc nitrate hexahydrate and urea into water, stirring for 10-20 minutes, dropwise adding titanium tetrachloride into the mixture, continuously stirring for 20-40 minutes, aging for 40-50 hours at 120-140 DEG C, carrying out suction filtration, washing, carrying out vacuum drying, and grinding to obtain a precursor; dissolving aluminum chloride hexahydrate and cerium chloride into water, adding the precursor, stirring for 20-40 minutes, reacting for 15-20 hours at 160-180 DEG C, cooling to room temperature, washing to be neutral, drying in vacuum, cooling to room temperature, heating to 300-400 DEG C, preserving heat for 5-10 hours, and cooling to room temperature. The problems of insufficient specific surface area and poor adsorption selectivity are effectively solved, the breakthrough sulfur capacity is high, and the adsorption performance is excellent.