86results about "Aluminium hydroxide preparation" patented technology

The invention relates to the technical field of aluminum oxide preparation, in particular to a method for preparing flaky aluminum oxide by using electrolyte waste liquid and flaky aluminum oxide. The method comprises the following steps: carrying out carbonation reaction on the electrolyte waste liquid by using carbon dioxide to obtain aluminum hydroxide precipitate; washing the aluminum hydroxide precipitate for the first time by using a washing agent to obtain a washed aluminum hydroxide solid-phase substance with a preset sodium content; calcining the washed aluminum hydroxide solid-phase substance to obtain a gamma-type aluminum oxide precursor; carrying out molten salt reaction on the composite molten salt system and the gamma-type aluminum oxide precursor to obtain a flaky aluminum oxide crude product; wherein the composite molten salt system is a mixture of sodium chloride, potassium chloride and sodium sulfate; and carrying out secondary washing on the sheet-shaped aluminum oxide crude product to obtain a sheet-shaped aluminum oxide product. According to the method, the flaky alumina with the high radius-thickness ratio is prepared under fluoride-free and strong acid conditions through a three-step core strategy of resource utilization of waste electrolyte, accurate sodium content control and directional induction of composite molten salt.

The invention discloses a method for preparing gamma aluminum oxide nanosheets based on precise regulation and control of complex precipitation, which comprises the following steps: introducing an organic complexing agent into a water phase system, constructing an organic-inorganic mixed solvent environment, and inducing an aluminum precursor to generate two-dimensional oriented growth under an alkaline condition to obtain a flaky boehmite precursor; then carrying out high-temperature calcination to prepare gamma aluminum oxide nanosheets; the preparation method is simple in process, mild in condition and easy for large-scale preparation, and the prepared gamma aluminum oxide nanosheet can still keep stable sheet-shaped morphology and gamma phase structure after being re-sintered for five times at 1000 DEG C, has a hierarchical pore structure and a specific surface area of more than 40 m < 2 > / g, and shows excellent high-temperature structural stability; the material can be widely applied to the fields of high-temperature catalyst carriers, adsorption separation materials, advanced ceramics and the like, and has a good application prospect.

New polycrystalline materials having yttrium aluminum perovskite (YAP) and yttrium zirconate (YZ) are described. In one aspect, a polycrystalline material (e.g., a bulk or monolithic polycrystalline material) may comprise (a) at least 50 wt. % yttrium aluminum perovskite (YAP) phase, and (b) at least 0.1 wt. % yttrium zirconate (YZ) phase. Such polycrystalline materials may realize an improved combination of properties, such as an improved combination of two or more of density, modulus of rupture (MOR), fracture toughness, dielectric strength, loss tangent, and plasma etch resistance, among others.

The invention discloses a method for extracting aluminum hydroxide from a material containing activated aluminum oxide. The method comprises the following steps: S1, replacing aluminum oxide in the activated aluminum oxide material; S1.1, leaching aluminum in the activated aluminum oxide material by ammonium oxalate: mixing the activated aluminum oxide material with ammonium oxalate, heating and reacting in a water reaction system to generate ammonia gas, leaching aluminum in the activated aluminum oxide material to obtain a reacted material, and filtering the reacted material to obtain leaching residues and a leaching solution containing (NH4) 3Al (C2O4) 3; the activated aluminum oxide material is bauxite, light-burned bauxite, a material containing a metakaolin phase or aluminum ash; s2, ammonia is added into the leachate for a reaction, and reaction product slurry containing aluminum hydroxide solid precipitates is generated; and S3, filtering and separating the reaction product slurry obtained in the step S2 to obtain an aluminum hydroxide solid precipitate and an ammonium oxalate solution.

The invention discloses a method for separating calcium, silicon, iron and aluminum and enriching titanium by combining titanium white waste acid and red mud, which comprises the following steps: adding antimony powder into concentrated sulfuric acid, heating, dissolving, cooling, adding a sodium dihydrogen phosphate dihydrate liquid (the liquid is formed by heating solid sodium dihydrogen phosphate dihydrate to 60 DEG C higher than the melting point of the sodium dihydrogen phosphate dihydrate), stirring, filtering, washing and drying to obtain the product. Antimony phosphate powder is obtained. The synthesis method is easy to operate, low in requirement on synthesis equipment, free of high-temperature reaction, short in time consumption, high in efficiency and high in product purity.

The invention relates to a multi-metal element nano-aluminum adjuvant and a preparation method and application thereof, the nano-aluminum adjuvant is a nano-particle containing an aluminum element and at least one metal element selected from magnesium, zinc and calcium, the nano-particle has a layered crystal structure, and the particle size is distributed in a range of 20-2000 nm. The difunctional nano-aluminum adjuvant has the beneficial effects that the difunctional nano-aluminum adjuvant is simple and convenient in preparation method, definite in component and uniform in particle size, the particle size of the particles can be manually regulated and controlled, and the difunctional nano-aluminum adjuvant can directly promote antigen presenting cells to be mature and activated and carry out MHC-I or II type antigen presentation.

The invention discloses a method for recovering valuable elements in liquid obtained after bauxite wet desulphurization, and relates to the technical field of bauxite resource utilization. Comprising the following steps: carrying out ceramic membrane filtration pretreatment on the bauxite wet desulfurization liquid to remove impurities; the silicon element is recycled in a targeted manner through a compound flocculation-calcination process to obtain the white carbon black; the iron element is recycled through ozone oxidation-ammonium bicarbonate precipitation, and high-purity iron oxide is prepared; separating and purifying an aluminum element through a seed crystal induction-calcination process to obtain metallurgical-grade aluminum oxide; a fluorine-containing precipitant is used for selectively precipitating and recovering magnesium element to obtain a high-quality magnesium salt product; and neutralizing the tail liquid, and discharging after reaching the standard. According to the method, accurate separation and high-valued utilization of four elements of aluminum, iron, silicon and magnesium are realized through a synergistic process of targeted recovery of silicon, gradient separation of iron and aluminum and selective precipitation of magnesium, and the problems of silicon resource waste, low element separation efficiency, insufficient product purity, secondary pollution and the like in a traditional process are thoroughly solved; all-component resource comprehensive utilization of desulfurized liquid resources is achieved.

The application provides a kind of superfine nanometer spherical alpha-Al2O3 and its preparation method.The preparation method of superfine nanometer spherical alpha-Al2O3 provided by the application comprises: mixing water-soluble inorganic aluminum source, weak alkaline precipitator and water to obtain sol; the sol is adjusted to pH value 2.8~3.2, mixed with plant gelling agent to gelatinize, and obtain gel; the gel is sequentially dried and calcined to obtain superfine nanometer spherical alpha-Al2O3.By adjusting the pH value of sol first, then adding plant gelling agent, the linear molecules of plant gelling agent can be rearranged and crosslinked by hydrogen bond to form stable three-dimensional network structure, and then the free movement of aluminum hydroxide particles is limited, which can effectively control the aggregation and morphology of aluminum hydroxide particles, and after drying and calcining treatment, superfine nanometer spherical alpha-Al2O3 with superfine particle size and extremely high sphericity is finally prepared.

This invention belongs to the field of boehmite powder preparation technology, and discloses a high specific surface area boehmite powder and its preparation method. The method includes: firstly, deeply cooling a macroscopic system containing aluminum salts to build a macroscopic cold energy reserve; then, at the instant of pulsed injection of an alkaline precipitant into the solution, utilizing the micro-area adiabatic space built by pausing external cooling, allowing the heat generated by the neutralization reaction to perform in-situ annealing of the newly formed crystal nuclei; finally, using the macroscopic cold energy reserve to quench and lock the annealed crystal nuclei. This invention, by synergistically coupling external cooling and reaction heat in space and time, transforms the traditional process of step-by-step low-temperature nucleation and high-temperature aging, where performance is at odds, into a physical process that is synergistically completed within a single cycle, thereby solving the problem of simultaneously achieving the two core performance indicators of high specific surface area and high thermal stability.

A method for producing a sheet phase pseudo-boehmite. The method includes: a) putting an organic acid into an aqueous solution in which an aluminum precursor is dispersed; and b) putting a product from the process of a) into a Taylor reactor, wherein a pressure of the Taylor reactor is 1 to 100 bar.

The invention relates to the technical field of secondary aluminum ash recovery, in particular to a catalyst for promoting secondary aluminum ash hydrolysis and a preparation method and application thereof, and the catalyst comprises a modified mesoporous silica carrier and an active component loaded on the carrier; the modified mesoporous silica carrier is obtained by grafting amino and sulfo bifunctional groups on the surface of the mesoporous silica carrier; the active components comprise modified sodium metaaluminate, copper salt, hydroxylated sodium alkyl benzene sulfonate and polycarboxylate; the modified sodium metaaluminate is prepared from triethanolamine and sodium metaaluminate through a coordination effect; the hydroxylated sodium alkyl benzene sulfonate is prepared by carrying out hydroxylation reaction on sodium alkyl benzene sulfonate and a hydroxylation reagent. The catalyst is prepared by loading the modified sodium metaaluminate, the copper salt, the hydroxylated sodium alkyl benzene sulfonate and the polycarboxylate active components with the modified mesoporous silica, and the hydrolysis rate of elemental aluminum and aluminum nitride is increased by catalyzing secondary aluminum ash hydrolysis.

The invention relates to the technical field of inorganic porous materials, and particularly discloses a preparation method of pseudo-boehmite for chloromethane. The preparation method comprises the following steps: S1, adding sodium-free aluminum salt, zirconium nitrate pentahydrate and tetrabutyl titanate into a mixed solvent, adding a complexing agent, then adding nano boehmite, uniformly mixing, firstly adjusting the pH value to 7.5-8.0, heating to 25-35 DEG C, mixing, then adjusting the pH value to 5.5-6.0, and mixing to obtain uniform sol; s2, urea and ammonium bicarbonate are mixed and dissolved in water, ammonium zirconium carbonate is added, and a mixed solution B is obtained; and S3, adding the mixed solution B into the uniform sol, uniformly mixing, carrying out gradient heating reaction, and then carrying out solid-liquid separation, washing and drying to obtain the pseudo-boehmite for chloromethane. The prepared pseudo-boehmite for chloromethane has the advantages of extremely low sodium content, high specific surface area and excellent thermal stability.

The invention discloses a pseudo-boehmite material as well as a preparation method and application thereof, and relates to the technical field of inorganic non-metallic materials. The pseudo-boehmite material has a developed pore system, the specific surface area of the pseudo-boehmite material is 350-450m / g, the pore volume of the pseudo-boehmite material is 1.2-1.8 cm / g, the average pore size of the pseudo-boehmite material is 10-15nm, and X-ray diffraction detection shows that clear characteristic diffraction peaks exist at 2 theta = 14.3 + / -0.2 degrees, 28.1 + / -0.2 degrees and 38.4 + / -0.2 degrees in an XRD (X-Ray Diffraction) pattern, the diffraction peak intensity is moderate, the peak shapes are symmetrical, and the material is complete in crystal structure and relatively high in purity. According to the pseudo-boehmite material and the preparation method and application thereof, the preparation method is simple and easy to control in technological process, the raw materials are low in cost and wide in source, and the prepared pseudo-boehmite material has excellent pore structure performance, so that the prepared pseudo-boehmite material has a good application prospect. Good application prospects are shown in the fields of petrochemical engineering catalyst carriers, environmental pollutant adsorbents and the like.

To provide a method enabling isolated collection of an element from a black mass.SOLUTION: A method includes the steps of: adding an alkaline solution to a black mass and obtaining a first effusion liquid and a first solid residue; adding an acid solution to the first solid residue for a first duration thereby obtaining a second effusion liquid; passing the second effusion liquid through a first ion exchange column, holding fluoride ion from the second effusion liquid in the first ion exchange column thereby obtaining a first eluate; passing the first eluate through a second ion exchange column, holding copper ion from the first eluate in the second ion exchange column thereby obtaining a second eluate; increasing pH of the second eluate, adding a predetermined amount of phosphoric acid to the second eluate thereby obtaining a first solution and a phosphoric acid (III) deposit; adding the first effusion liquid and the first solution together thereby obtaining a second solution; and adjusting pH of the second solution thereby a residual deposit and a lithium solution.SELECTED DRAWING: Figure 1

The invention discloses a preparation method for recycling a high-aluminum material, which comprises the following steps: drying the high-aluminum material, crushing and grinding to 100-200 meshes to obtain high-aluminum material powder; the high-aluminum material powder and a hydrogen peroxide solution are mixed, stirred and pretreated, solids are filtered, collected and dried, and modified high-aluminum material powder is obtained; the modified high-aluminum material powder is mixed with concentrated sulfuric acid, pure water is added while stirring is conducted, the concentrated sulfuric acid is used for dilution exothermic reaction, solid-liquid separation is conducted after the reaction is completed, and aluminum-rich leachate and filter residues are obtained; an alkaline solution is added into the obtained aluminum-rich leaching solution, the pH value of the solution is adjusted, aluminum hydroxide solids are obtained after filtering, and resource recycling is conducted; and carrying out high-temperature calcination on the aluminum hydroxide solid to obtain an aluminum oxide solid, and carrying out resource recycling. According to the technical scheme, the aluminum element in the high-aluminum material is further extracted through concentrated sulfuric acid leaching enrichment and precipitation calcination, the economic value of the high-aluminum material can be effectively increased, and recycling treatment of the aluminum ash is fully achieved.

A method for preparing aluminum hydroxide dry powder and its sol, and its application, relates to the field of vaccine adjuvant preparation. The method includes: preparing an ammonia solution or sodium hydroxide solution; preparing an aluminum chloride solution; neutralizing the ammonia solution or sodium hydroxide solution with the aluminum chloride solution at 15-20°C to generate a milky white, translucent colloidal suspension; filtering; freeze-drying followed by aging to obtain aluminum hydroxide dry powder; adding the dry powder to a sodium chloride electrolyte solution, processing it in a high-speed shear disperser, redispersing the dry powder into a sol at a certain temperature, and homogenizing it cyclically in a high-pressure homogenizer to obtain aluminum hydroxide sol; removing electrolytes from the aluminum hydroxide sol using electrodialysis, followed by high-pressure sterilization and packaging. This invention solves the problems of clumping and sedimentation during sterilization and storage, poor stability, inconvenience in transportation and use, and limited concentration in existing aluminum hydroxide adjuvant preparation methods.

The application discloses a gas-liquid phase parallel flow rotating liquid film reactor and application thereof in preparation of metal hydroxide. The application is based on the basic process of preparing metal hydroxide from a gas-liquid phase precipitation method, and a gas-liquid phase multi-fluid parallel flow rotating liquid film reactor is designed through computational fluid dynamics simulation analysis, multiple gas-liquid fluid inlets are constructed, and the traditional vertical inlet is improved into tangential feeding along the rotating direction, so that the forced mixing process of the gas-liquid two phases in the reaction space is improved, the microscopic mixing and nucleation process of the reactants are strengthened, the inlet anti-overflow device is added, the upward overflow of the increased inlet flow fluid is avoided, the quality control of the product is strengthened, the efficient control of the nucleation particle size and distribution is realized, the production efficiency and product quality can be improved, the product with small particle size and narrow particle size distribution is obtained, the product particle size can be controlled in the range of 15-200 nm, and the primary particle size distribution range can be reduced to 30-60 nm.

The invention discloses a method for preparing high-dispersion spherical alumina powder, which comprises the following specific steps: adding a certain proportion of aluminum sulfate octadecahydrate and aluminum nitrate nonahydrate into a three-neck flask at room temperature, adopting urea as a precipitator, uniformly stirring, heating in a water bath to a certain temperature, continuously stirring for a period of time to obtain a suspension, filtering the suspension, and drying to obtain the high-dispersion spherical alumina powder. And washing and spray-drying filter residues obtained by filtering, and calcining at high temperature to obtain the high-dispersion spherical aluminum oxide. The spherical aluminum oxide prepared by the method is excellent in dispersity, controllable in particle size, simple in process and high in production efficiency.

The application relates to the technical field of alumina ball preparation, in particular to a preparation method of high-strength potassium permanganate alumina ball, which comprises the following steps: S1. adding an aluminum salt into deionized water to obtain an aluminum salt solution; S2. adding lye into the aluminum salt solution to adjust pH to obtain an aluminum hydroxide slurry; S3. preparing a silicic acid sol; S4. adding the silicic acid sol obtained in the step S3 into the aluminum hydroxide slurry obtained in the step S2, then adding modified polyethylene glycol, and performing ball milling to obtain a mixed liquid; S5. dropping the mixed liquid in the step S4 into an oil ammonia column to obtain alumina balls; and S6. adding potassium permanganate and modified polyethylene glycol into deionized water, stirring at room temperature for 10-20 min, then adding the alumina balls obtained in the step S5, and performing ultrasonic immersion to obtain potassium permanganate alumina balls. The prepared potassium permanganate alumina ball has high strength, high potassium permanganate loading capacity and good purification effect.

The present invention relates to an alpha alumina having a high purity, a high density and a low surface area and particularly, to a method to produce such an alpha alumina as well as to the use of the alpha alumina in sapphire production or the production of composite and ceramic bodies.

The present application relates to the technical field of hydrometallurgy, and particularly relates to a method for selectively separating aluminum impurities from calcified roasting acid leaching solution and preparing aluminum hydroxide, which comprises the following steps: passing inert gas into the solution of vanadium stabilized in a dissolved state under acidic conditions and stirring, heating the solution and adding aluminum removal agent, and using the local alkaline environment generated by the hydrolysis of the aluminum removal agent to preferentially promote the formation of aluminum hydroxide precipitate, while vanadium ions remain in the solution.

A method and system for recycling aluminium-air batteries and recovering valuable components, aluminium trihydroxide (ATH) and potassium hydroxide (KOH) electrolyte includes selective precipitation and electrodialysis techniques to efficiently recover ATH and KOH with high purity. The process begins with a feed collection unit (102) receiving a 5 recycled solution mixture from batteries, which is then filtered by a filtration unit (104) to filter out sustemded particles of ATH and impurites. The filtered solution is subjected to precipitation in a precipitation unit (108) to precipitate ATH, and thereafter to electrodialysis in an electrodialysis unit (114) to convert the potassium salt solution remaining after the precipitation to KOH electrolyte and an acid. The electrodialysis is carried out using ion-0 selective membranes and acid acid obtained from the electrodialysis unit (114) in the precipitation unit (108).

The application discloses a preparation method of spherical boehmite and relates to the technical field of inorganic materials. The spherical boehmite prepared by the method has high sphericity and can be used as a reinforcing agent to fill materials such as potting adhesive, paint, rubber, plastic, electronic substrate and battery diaphragm. Compared with boehmite directly obtained by hydrothermal reaction of aluminum hydroxide, the spherical boehmite prepared by the method has a smaller specific surface area and a smaller influence on the viscosity of a polymer system, so that a higher filling amount can be realized, and the spherical boehmite can also be used as a flame retardant to effectively improve the flame retardant performance of the polymer system.

The invention relates to processes for the removal of iron impurities and optionally other impurities from rare earth metal-containing compositions such as rare earth metal-containing compositions from magnets and ores.

The invention relates to the technical field of batteries, in particular to a method for electrochemically recycling a waste metal oxide positive electrode and application of the method. The electrolytic tank is composed of a cathode (a waste metal oxide anode), an anode (a carbon material, a high-conductivity inert material and the like), an electrolyte (alkali metal chloroaluminate molten salt, ionic liquid and the like) and an oxide additive (lithium oxide, calcium oxide and the like). Through a one-step electrolysis process, the waste metal oxide positive electrode material is reduced and decomposed to form a transition metal salt and a lithium salt. And then the transition metal salt and the lithium salt are easily separated through simple water leaching post-treatment. According to the method for electrochemically recycling the waste metal oxide positive electrode, decomposition of the waste metal oxide positive electrode is achieved through energy of reduction electrons, the adopted electrolyte, electrode materials and the like are low-cost materials, compared with a traditional method, about 20% of energy consumption and greenhouse gas emission can be reduced, and in addition, the profit can be increased by nearly 10 times.

The invention provides a method for improving the filtering performance of an aluminum precipitation material under a laterite-nickel ore nitric acid system, and relates to the technical field of chemical metallurgy. S2, carrying out homogeneous aluminum precipitation reaction on the iron precipitation mother liquor, a precipitator and an additive at a certain temperature to obtain aluminum hydroxide and aluminum precipitation mother liquor; s3, adding magnesium oxide into the aluminum precipitation mother liquor, and carrying out homogeneous precipitation reaction at a certain temperature to generate MHP and nickel and cobalt precipitation mother liquor; and S4, the nickel and cobalt precipitation mother liquor is applied to a homogeneous aluminum precipitation section through membrane treatment and sulfate circulation. The addition of the additive does not introduce new impurities, and the additive is recycled after sulfate is separated from a nitric acid system through a nanofiltration membrane treatment technology. The whole process realizes cyclic utilization of resources, and has a remarkable effect and a huge economic value.

Black mass from disused lithium batteries is leached for recovery of various metals in a process that includes precipitation, solvent exchange, ion exchange, and salt splitting to create multiple product streams for recovery of pure value products. Most typically, the process is a closed-loop process and allows for production of metallic cobalt and nickel, EMD, and a high purity lithium hydroxide or carbonate product with minimal generation of waste streams.

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on an eroded surface of a waste sagger discarded. Therefore, when the method for producing high-purity lithium sulfate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium sulfate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained as by-products during the production process of the lithium sulfate.

The invention relates to a flame-retardant material and a preparation method thereof, and belongs to the technical field of flame-retardant materials. The method comprises the following steps: carrying out a neutralization reaction on an acidic aluminum salt solution and an alkaline substance solution, and controlling the pH value of the neutralization reaction to obtain incompletely crystallized aluminum hydroxide; at a set temperature, carrying out solvothermal reaction on the incompletely crystallized aluminum hydroxide and soluble salt to obtain a flame-retardant material; wherein anions of the soluble salt can be coordinated with aluminum ions of the aluminum hydroxide to form Al-O-C bonds. According to the method provided by the invention, the stability of the prepared flame-retardant material at normal temperature and rapid gas release H2O and CO2 response at the temperature of 200 DEG C or above can be realized, and finally, an environment-friendly and low-cost intelligent flame-retardant system is formed.