228results about "Aluminium hydroxide preparation" patented technology

The invention relates to the technical field of alumina powder, in particular to alumina powder and a preparation process thereof. The method comprises the following steps: (a) preparing an aluminum source solution; (b) preparing an alkali solution; (c) preparing an aluminum oxide precursor; step (d) aging; step (e) drying; and (f) calcining to obtain uniformly dispersed aluminum oxide powder. The average grain size of the prepared alumina powder product is 35.9-40.1 nm, the specific surface area is 435-667 m < 2 > / g, the pore volume is 0.021-0.103 cm < 3 > / g, and the most probable pore size is 3.7-3.8 nm. The average grain size is small, the product particles are uniform, the specific surface area is large, the stability is good, the cost is low, the process is simple, and large-scale production operation is easy.

The invention relates to a preparation method of pseudo-boehmite, which comprises the following steps: (1) dissolving inorganic aluminum salt and polyaluminum chloride in water to prepare an aluminum salt solution; (2) dissolving meta-aluminate in water, and then adding a composite pore-enlarging agent to prepare a meta-aluminate composite solution; (3) dropwise adding the meta-aluminate composite solution into the aluminum salt solution to form gel, stirring while dropwise adding, and controlling the gel forming temperature to be 60-70 DEG C; (4) adjusting the pH value of the reaction liquid to 9.0 by using ammonia water, controlling the temperature at 85-90 DEG C, and stirring and aging for 1-2 hours; (5) after aging is completed, collecting a product, filtering and washing with water; and (6) drying by adopting a gradient heating mode. The inorganic aluminum salt and the polyaluminum chloride are combined, the ammonium bicarbonate, the urea and the PEG600-800 are compounded to serve as a pore-enlarging agent, and gradient heating is adopted for drying, so that the specific surface area of the pseudo-boehmite can be effectively increased, the peptizing index is improved, the pseudo-boehmite has good compounding performance, the specific surface area is 445.8-475.2 m < 2 > / g, and the peptizing index is 98.2-99.6%.

Provided is a method for producing a high-purity aqueous lithium salt solution, the method allowing filtering aluminum phosphate in a short time. The method for producing a high-purity aqueous lithium salt solution includes: a step of adjusting the pH of a slurry containing a mixture of lithium phosphate and aluminum hydroxide obtained from a first aqueous lithium salt solution being a raw material to a range of 2 to 3 to obtain a precipitate of aluminum phosphate; a step of filtering off and removing the precipitate of aluminum phosphate to obtain a second aqueous lithium salt solution; and a step of purifying the second aqueous lithium salt solution to obtain a high-purity aqueous lithium salt solution.

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 belongs to the technical field of preparation of metal hydroxides, and particularly relates to a preparation method of nanoscale aluminum hydroxide micro powder. Comprising the following steps: (1) dispersing aluminum salt, glucose and long-chain alkyl quaternary ammonium salt in deionized water to prepare an aluminum salt mixed solution; (2) dropwise adding alkali liquor into the aluminum salt mixed solution; (3) reacting for a period of time, and adding the long-chain alkyl quaternary ammonium salt again for reacting; and (4) filtering, washing and drying to obtain the nanoscale aluminum hydroxide micro powder. Glucose not only plays a role of a template agent in the early stage of precipitation, but also reduces the particle size of precipitated particles. By adding the long-chain alkyl quaternary ammonium salt step by step, dispersion of the precipitate can be better promoted, and secondary agglomeration of the separated precipitate is prevented. The method is simple in process, the aluminum hydroxide micro powder is small in particle size, controllable in particle size and low in industrialization cost, and the current efficient, economical and environment-friendly requirements are met.

The invention discloses a comprehensive utilization method of refining slag, which comprises the following steps: dissolving the refining slag in hydrochloric acid to obtain a refining slag pickle liquor; filtering the refining slag pickle liquor to obtain first filtrate and filter residues, and washing the filter residues to obtain first solid and first washing liquor; combining the first washing liquid and the first filtrate to obtain a second mixed solution; and adding an oxidizing agent into the second mixed solution to obtain a first precipitate. According to the method, the refining slag is subjected to acid leaching with hydrochloric acid, the PH value of the solution is adjusted, silicon dioxide, aluminum hydroxide, ferric hydroxide, calcium chloride or calcium oxide and recycled hydrochloric acid are obtained, the accumulated refining slag is decomposed into various new substances in the process reaction, the method is simple, the substance purity is high, the refining slag is recycled, and large economic value can be created; and meanwhile, mining of various resources is reduced. And a new direction is found for comprehensive utilization of the refining slag.

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.

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 invention relates to a method for preparing vanadium, chromium, aluminum and silicon products through gradient separation of vanadium shale. According to the technical scheme, silicon in the vanadium shale alkaline leaching solution is removed through a sulfuric acid precipitation method, and a desilicication solution and a siliceous precursor I are obtained; washing the siliceous precursor I with sulfuric acid, washing with water and calcining to obtain white carbon black; carrying out vanadium-chromium co-extraction on the desilicication liquid by adopting an amine extraction agent to obtain a vanadium-chromium organic phase; carrying out vanadium-aluminum extraction separation on the washing liquid by adopting an amine extraction agent to obtain a vanadium-rich organic phase and an aluminum-containing raffinate; the vanadium-rich organic phase and the vanadium-chromium organic phase are mixed, vanadium-chromium separation is achieved through step-by-step reverse extraction, and vanadium-rich liquid and chromium-rich liquid are obtained; adjusting the pH value of the aluminum-containing raffinate to precipitate aluminum hydroxide, and calcining to obtain aluminum oxide; carrying out ammonium salt vanadium precipitation on the vanadium-rich liquid to obtain ammonium polyvanadate, and calcining to obtain vanadium pentoxide; and reducing the chromium-rich liquid, adjusting the pH value, precipitating chromium hydroxide, and calcining to obtain chromium sesquioxide. The method is high in leaching rate, small in slag amount, high in product purity and high in recovery rate.

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.

Provided is a method for synthesizing a sol solution for forming a porous alumina film having excellent adhesiveness to various substrate surfaces, high heat resistance and a high specific surface area.　A SiO2Al2O3-containing sol solution is prepared by separately preparing an alkoxysilane solution and an aluminum solution in advance, precipitating a precipitate comprising a silicon compound adsorbed on aluminum hydroxide in a mixed solution of the alkoxysilane solution and the aluminum solution, washing the precipitate filtrated off from the mixed solution with water to produce a precipitate cake, adding water to the precipitate cake to prepare a slurry solution, and subjecting the slurry solution to a pH adjustment treatment and subsequently to an autoclave treatment. By the pH adjustment treatment of the slurry solution, the pH value of the slurry solution is controlled so as to fall within a specified pH range in which the solution state of the SiO2Al2O3-containing sol solution after the autoclave treatment becomes a sol state. The sol solution is suitable for forming a porous alumina film having excellent adhesiveness to various substrate surfaces, high heat resistance and a high specific surface area.

The invention relates to a preparation method of an aluminum hydroxide adjuvant. Specifically, the method comprises the following steps: simultaneously spraying an alkali solution and an aluminum chloride solution into a reaction pipeline in a vaporific form through two pump bodies by virtue of fluid pressure difference, or spraying the alkali solution into a flowing aluminum chloride solution reaction pipeline in a vaporific form by virtue of fluid pressure difference, and controlling the temperature in the pipeline to be 70-80 DEG C for reaction, the reaction liquid flows out through a pipeline within a certain time to obtain an aluminum hydroxide adjuvant crude product, and then the aluminum hydroxide adjuvant is obtained through centrifugation, ion removal, sterilization and packaging. The quality index of the aluminum hydroxide adjuvant obtained by the method is good, stable and uniform, and the immunoadsorption effect of the adjuvant and the quality, effectiveness and safety of a vaccine are ensured. The method is simple in technological process, the whole process is continuously carried out, the barrier of intermittent operation is broken through, operation is simple, and the method can be applied to large-scale production.

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.

A process for recovering titanium dioxide from a titanium-bearing material, the process including the steps of: leaching the titanium-bearing material in a first leaching step at atmospheric pressure and at a temperature of 70 to 97° C. with a first lixiviant to produce a first leach solution comprising undissolved first leach solids that include a titanium content and a first leach liquor, the first lixiviant comprising hydrochloric acid at a concentration of less than 23% w / w; separating the first leach liquor and the undissolved first leach solids; leaching the first leach solids in a second leaching step at atmospheric pressure and at a temperature of 60 to 80° C. with a second lixiviant in the presence of a Fe powder reductant to produce a second leach solution comprising undissolved second each solids and a second leach liquor that includes a leached titanium content and iron content, the second lixiviant comprising a mixed chloride solution comprising less than 23% w / w hydrochloric acid and an additional chloride selected from alkali metal chlorides, magnesium chloride and calcium chloride, or mixtures thereof; separating the second leach liquor and the undissolved second leach solids; and thereafter separating the titanium dioxide and the iron content from the second leach liquor by precipitation, and regenerating the second lixiviant for recycle to the second leaching step.

Hydrofluoric acid-specific recovery system for the refining of industrial raw materials, comprising: a wastewater collection channel which receives hydrofluoric acid-containing wastewater, and an activated carbon filter system which filters out the organic substances and the oxidizing substances from the hydrofluoric acid-containing wastewater and then produces a first wastewater, and a capacitor-based deionization system which transports the ions of the first wastewater to an electrode of opposite charge and then produces a low-concentration fluorine wastewater, and also causes the ions to detach from the electrode and then produces a high-concentration fluorine wastewater, and a low-concentration collection channel which serves to receive the low-concentration fluorine wastewater, at least one filtration unit which filters the low-concentration fluorine wastewater and then produces recovery water for internal plant use, and a high-concentration collection channel.which serves to receive the highly concentrated fluorinated wastewater, and a reaction plant which produces a cryolite through a reaction of an added aluminum-containing sodium compound with the highly concentrated fluorinated wastewater.

The present invention relates to an aluminum oxide with specific pore characteristics and good thermal stability. The aluminum oxide is also characterized in that the aluminum oxide has a high bulk density. The aluminum oxide has a pore volume of between 0.50 and 0.75 mL / g, more particularly between 0.50 and 0.70 mL / g, in the range of pores with a size between 5 nm and 100 nm, and less than or equal to 0.20 mL / g, more particularly less than or equal to 0.15 mL / g, or even less than or equal to 0.10 mL / g, after calcination for 5 hours in air at 1100° C.

The present invention relates to the preparation of a mesoporous alumina containing lanthanum shaped from a boehmite gel in which at least one lanthanum precursor is added in the step of precipitating at least one aluminum salt to form a boehmite gel and / or in the step of shaping the boehmite gel obtained. The alumina containing lanthanum according to the invention, due to its advantageous properties, can be used as a catalyst support in all refining processes as well as an adsorbent, in particular for catalytic processes treating hydrocarbon cuts such as the hydrotreatment of vacuum distillates.

The invention discloses an aluminum ash recovery process, and belongs to the technical field of aluminum ash treatment. The aluminum ash recovery process comprises the following process steps: mixing and stirring aluminum ash and an extracting agent A in a first reactor to react for a first reaction time, filtering to obtain a first filtrate, introducing the first filtrate into a second reactor, adding an extracting agent and a regenerant B, and stirring to react for a second reaction time to obtain a second filtrate; a regenerated extracting agent A and a metal aluminum element recovery product are formed and filtered, a second filtrate flows back into the first reactor to continue to participate in the reaction, and filter residues contain the metal aluminum element recovery product; the second filtrate contains a regenerated extractant A; the extracting agent A is concentrated hydrochloric acid with the concentration of 36-38%; and the extractant regenerant B is sodium hydroxide.

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.

To provide a method for producing boehmite alumina having high crystallinity by utilizing short-time hydrothermal treatment.SOLUTION: A method for producing crystalline boehmite alumina includes: (a) a step of preparing a dispersion containing an alumina hydrogel; and (b) a step of adjusting the alumina hydrogel to a pH range of 10.6-12.6 with a basic compound, preparing a dispersion containing the basic alumina hydrogel, and then performing hydrothermal treatment to obtain a dispersion containing crystalline boehmite alumina.SELECTED DRAWING: None