164results about "Aluminium hydroxide preparation" patented technology

The invention discloses a method for preparing a raw material of a hard carbon negative electrode material from bituminous coal, which comprises the following steps: by taking the bituminous coal as a main raw material, removing ash substances in the bituminous coal through the processes of crushing, alkaline leaching, alkaline leaching activation, centrifugal washing and acid leaching to prepare the raw material of the hard carbon negative electrode material. And the produced deashing liquid is subjected to silicon precipitation and aluminum precipitation processes to realize separation of silicon and aluminum and recycling of alkali liquor. According to the method, high-value utilization of the bituminous coal in the field of preparation of the sodium-ion battery hard carbon negative electrode material is realized, meanwhile, separation and extraction of valuable components such as silicon and aluminum are realized, a direction is found for high-value resource utilization of the bituminous coal, and meanwhile, conditions are created for low-cost preparation of the sodium-ion battery negative electrode material. The method has the characteristics of comprehensive utilization of valuable components, low cost and the like.

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 nano aluminum oxide by a microreactor. The method comprises the following steps: S1, mixing aluminum salt and an alkaline solution through the microreactor, and standing and aging to obtain hydroxide precipitate; and S2, carrying out heat treatment on the hydroxide, and cooling, washing and drying after the treatment is finished, so as to obtain the nano aluminum oxide. The average particle size of the spherical aluminum oxide nano particles synthesized by the method is 16.8 nm, the average particle size of the spherical aluminum oxide nano particles synthesized by a traditional beaker method is 126.76 nm, and the average particle size of the spherical aluminum oxide nano particles synthesized by the method is reduced by 82.22% compared with the average particle size of the spherical aluminum oxide nano particles synthesized by the traditional beaker method, so that the invention provides an extensible nano material synthesis strategy.

The invention relates to the technical field of preparation of nano boehmite, in particular to a preparation method and application of dispersed nano boehmite. The preparation method comprises the following steps: mixing an interfacial agent, urea and an aluminum salt aqueous solution through a sol-gel method to form a uniformly dispersed boehmite precursor solution; then, carrying out aging treatment on the precursor solution to form an aging reaction material; and finally, carrying out hydrothermal reaction to obtain a nano boehmite product with good dispersity under the conditions of high temperature and high pressure. According to the preparation method, a three-stage synergistic mechanism of uniform nucleation, dual stable agglomeration inhibition of an interfacial activity regulating agent and crystal face selective adsorption guide morphology evolution is realized through a urea slow-release alkaline environment, the technical bottlenecks of poor dispersity and uncontrollable morphology in traditional boehmite preparation are broken through, and finally, the preparation method has the advantages that the preparation efficiency is high, and the preparation cost is low. The purity of the obtained dispersing type nano boehmite is up to 99.9% or above, and the dispersing type nano boehmite has excellent physical properties.

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.

The invention provides a method for recycling battery pieces from waste photovoltaic panels, and belongs to the technical field of solid waste resource utilization. According to the method, residual EVA decomposition and aluminum back electrode recycling are achieved through selective alkali liquor treatment, then silicon wafers are obtained through acid leaching recycling, the silver electrode is further recycled through electrolytic treatment, the treatment process is simplified, and the recycling cost is reduced; in addition, the recovery rate of aluminum and silver is high.

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include reacting a feed material comprising at least two metals selected from the group consisting of iron, magnesium, and calcium with a weak acid to produce a first leachate comprising ions of the at least two metals and an insoluble product; reacting the first leachate with a base to produce a first solid product comprising a first metal and a second leachate comprising ions of a second metal different from the first metal; and reacting the second leachate with the base to produce a second solid product comprising the second metal and a third leachate.

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 present invention provides a coating agent including α-alumina particles having a polyhedral crystal structure and having an average particle size (D50) of 100-900 nm. The α-alumina particles are produced in such a way that pseudo-boehmite is mixed with a fluoride-based mineralizer and ultrapure water and pulverized to obtain a powder which is then fired and grown into a polyhedral shape. The polyhedral alumina particles make surface contact and are coated on the surface of a porous polymer substrate, and empty space induced by the interstitial volume between particles is formed larger than that of spherical particles, thereby being capable of achieving excellent air permeability while effectively suppressing thermal contraction of the porous polymer substrate. In addition, due to a nano-level particle size, excellent dispersibility and the formation of a thin coating layer can be achieved.

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.

Described herein are various embodiments of systems and methods for extracting and isolating reusable materials from metallurgical slags, such as iron slag, steel slag, blast furnace slag, BOF slag, and / or EAF slag, using aqueous acid and base solutions. In some embodiments, the acid and base solutions or materials can be generated electrochemically in a salt cracking acid-base generation (ABG) cell or cell stack.

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 present application belongs to the technical field of catalytic hydrogenation, and relates to a method for preparing iso-octyl aldehyde by selectively hydrogenating iso-octyl aldehyde. The iso-octyl aldehyde, hydrogen and a nickel catalyst are subjected to a contact reaction. The nickel catalyst comprises an alumina carrier and an active component nickel dispersed on the alumina carrier. The alumina carrier is prepared by using a rotary strengthening device, and the preparation comprises the following steps: an aluminum sulfate solution and an aluminum hydroxide-sodium hydroxide mixed solution are jointly pumped into a rotary strengthening reactor by using a liquid pump to form a slurry; the slurry is sprayed into the inside of a wire mesh packing through a solution mixing distributor, and the rotary wire mesh packing shears the slurry into small units; the small units are introduced into a crystallization kettle through the outlet of the rotary strengthening reactor to perform crystallization to obtain crystallized materials, and after filtration, washing and drying, the materials are calcined to obtain the alumina carrier. The present application uses commonly used industrial nickel components and alumina carriers, the reaction condition is mild, the selectivity of iso-octyl aldehyde is high, and the present application has certain industrial application prospects.

There is provided a method for producing a coated substrate, the method comprising: forming an aluminium (oxy) hydroxide slurry by simultaneously feeding streams of an aluminium nitrate solution and a basic solution, such as an ammonia solution, into a liquid over a reaction period, while maintaining an elevated temperature and a controlled pH; allowing a substrate to contact the slurry to thereby form an aluminium (oxy) hydroxide coating on the substrate; separating the coated substrate from the liquid.

The present invention provides a zirconia-containing alumina-based composite oxide which contains zirconia and alumina, wherein with respect to the XRD profile A after 12-hour heating at 1200°C at the atmospheric pressure, if X is the intensity of the peak associated with θ-Al2O3 phase around 2θ = 33°, Y is the intensity of the peak associated with α-Al2O3 phase around 2θ = 26°, and R is X / Y, R satisfies formula (1). 0.25<R<5.0

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 invention belongs to the technical field of preparation of aluminum-containing compounds, and particularly discloses a method for preparing aluminum hydroxide with high specific surface area based on sodium tetrachloroaluminate. The preparation method comprises the following steps: mixing a sodium tetrachloroaluminate raw material (sodium tetrachloroaluminate solid waste residue as a byproduct in production of glufosinate-ammonium or methyl phosphorus dichloride) with water to obtain a mixed solution; mixing the mixed solution with alkali liquor, and reacting to obtain reaction liquid containing aluminum hydroxide; and sequentially aging, separating and washing to obtain the aluminum hydroxide with high specific surface area. The obtained aluminum hydroxide is a porous material, the specific surface area reaches 300 m < 2 > / g or above, the microstructure is a sheet / block nanoparticle combination, and the aluminum hydroxide has good dispersity and activity and can be used in the fields of catalyst carriers, adsorbents, flame retardants and the like. The method is simple in process and does not involve complex equipment and high energy consumption conditions; and when the treated object is industrial solid waste residue, the method has the advantages of high aluminum recovery rate, thorough impurity removal and no influence of phosphorus.

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 application relates to an aluminum hydroxide dry glue and a preparation method thereof, and belongs to the technical field of fine aluminum oxide; the method comprises the following steps: neutralizing an acid source and an alkali source to obtain reaction slurry, the pH value of the neutralization reaction process is 3-5, and the pH value of the neutralization reaction endpoint is 5-6.5; the reaction slurry is aged to obtain aluminum hydroxide dry glue; the generation and growth of aluminum hydroxide or pseudo-boehmite seeds are prevented through the mode of controlling the pH values of the neutralization reaction process and the endpoint, so that the final product is aluminum hydroxide dry glue, a new path for preparing aluminum hydroxide dry glue through a neutralization method is provided, the method has the advantages of simple process, high controllability, excellent product performance and the like, the obtained aluminum hydroxide dry glue has the characteristics of high acid solubility and low density, can be completely dissolved in aluminum sulfate or lactic acid, and the bulk density is less than or equal to 0.4 g / ml.

The present invention provides an optimized method for recovering high-purity lithium carbonate 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 carbonate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium carbonate 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 carbonate.