386results about "Aluminium oxides/hydroxides" patented technology

The invention provides a preparation method of pseudo-boehmite with high bulk specific gravity, and belongs to the field of pseudo-boehmite. The method comprises the following steps: carrying out a low-temperature neutralization reaction on an aluminum salt solution and a sodium metaaluminate solution, and keeping the pH value of a neutralized material at 6-6.5 in the reaction process to obtain amorphous precursor slurry; carrying out solid-liquid separation on the amorphous precursor slurry to obtain first mixed slurry; performing high-temperature aging crystal transformation reaction on the first mixed slurry and sodium carbonate to obtain macroporous pseudo-boehmite slurry; performing solid-liquid separation on the macroporous pseudo-boehmite slurry to obtain second mixed slurry; carrying out modification treatment on the second mixed slurry and acid or acid aluminum salt so as to re-agglomerate the non-peptized macroporous pseudo-boehmite to obtain third slurry; performing solid-liquid separation on the third slurry to obtain fourth mixed slurry; and carrying out spray drying on the fourth mixed slurry to obtain the pseudo-boehmite. Therefore, the bulk density of the pseudo-boehmite is improved.

Ultrafast flash evaporation joule heating synthesis methods and systems, more particularly, ultrafast synthesis methods for recovering metals from ores, fly ash, and bauxite residue (red mud).

A powder for additive manufacturing which is an inorganic oxide powder, wherein D10 is 1.0 to 4.0 μm, D50 is 5.5 to 9.0 μm, D90 is 20.0 to 40.0 μm, and the volume ratio of particles having a particle size of 16.8 to 60.0 μm is 15.0 to 22.0 vol %.

The invention relates to the field of inorganic material preparation, and particularly discloses pseudo-boehmite and a preparation method thereof. A preparation method of pseudo-boehmite comprises the following steps: (1) mixing an aluminum salt solution and an aluminate solution, adding a crystal form regulating agent, and stirring for reaction to obtain a sol system; the crystal form regulating agent is ZnS quantum dots modified by thiohydracrylic acid; (2) adding a pore diameter guiding agent into the sol system, and aging for 6-8 hours; the pore diameter guiding agent is a compound of a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer and sodium citrate; and (3) carrying out solid-liquid separation on the aged sol system, and washing and drying the obtained solid to obtain the pseudo-boehmite. The proportion of 5-10nm pores of the pseudo-boehmite prepared by the preparation method disclosed by the invention reaches 90% or above, so that the pore distribution requirement of a fine catalytic reaction on the pseudo-boehmite can be met, and the efficient catalytic reaction is favorably realized.

Disclosed are an alumina porous material and its preparation and application. The porous material has substantially orderly distributed spherical or quasi-spherical cavities inside, the cavities have an average diameter of 100-500 nm, and at least a part of adjacent cavities are connected through mesopores. The alumina porous material is suitable for being used as a support for preparing a heavy residue hydroprocessing catalyst, or as a support for catalysts used in other macromolecular catalytic processes.

The invention provides a comprehensive utilization method of clay type lithium ore, and relates to the field of hydrometallurgy. The comprehensive utilization method of the clay type lithium ore comprises the following steps: mixing the clay type lithium ore with concentrated sulfuric acid, and carrying out low-temperature roasting at the temperature of 100-300 DEG C to obtain a roasted cured material; adding water into the roasted and cured material, leaching, and carrying out solid-liquid separation to obtain a lithium-rich aluminum leaching solution; adsorbing the lithium-rich aluminum leaching solution by using an aluminum ion sieve adsorbent to obtain an aluminum-rich adsorbed solution and a lithium-loaded ion sieve; analyzing the lithium-loaded ion sieve to obtain a lithium-rich desorption solution; the lithium-rich desorption solution is sequentially subjected to purification and lithium precipitation, and battery-grade lithium carbonate is obtained; sequentially carrying out iron removal, purification and impurity removal on the aluminum-rich adsorption post-liquid to obtain iron slag and an aluminum sulfate solution; and sequentially carrying out aluminum precipitation and roasting on the aluminum sulfate solution to obtain the metallurgical-grade aluminum oxide. The method has the advantages of high-efficiency leaching of lithium and aluminum, high-efficiency separation of lithium and aluminum, environment friendliness, simple process and the like.

The invention discloses a method for comprehensively recycling electrolytic aluminum carbon residues, and relates to the technical field of comprehensive recycling of waste materials. The method for comprehensively recycling the electrolytic aluminum carbon residues comprises the following steps of: breaking the carbon residues into 0.1-1cm particles by a hammer, carrying out wet ball milling under the condition of adding a flotation agent, and separating carbon powder on the upper layer and gray regenerated cryolite on the bottom layer of slurry through flotation equipment, wherein the fineness is 40-100 meshes, and the carbon content is less than 1%; the preparation method comprises the following steps: adding water into cryolite to prepare slurry, adding calcium oxide or calcium hydroxide, heating, stirring and reacting for 1-3 hours, and carrying out filter pressing to obtain filtrate and filter residues which are calcium fluoride and a sodium metaaluminate solution; the purity of the calcium fluoride powder is greater than 85%; and introducing hydrochloric acid into the filtrate, stirring and adjusting the pH to 7-9 to obtain aluminum hydroxide slurry, filtering and washing to obtain aluminum hydroxide, and drying to obtain the aluminum hydroxide with the purity of more than 95%.

The invention relates to the technical field of suspension roasting, in particular to a flowing suspension roasting system and method for desiliconizing and purifying coal gangue. The system comprises a multi-stage preheating unit, a multi-stage cooling unit, a flowing suspension roasting furnace and a crystal form control device which are connected in sequence, and the method comprises the steps that coal gangue materials are subjected to multi-stage preheating, so that the materials are heated in stages; performing high-temperature roasting in a flowing suspension roasting furnace, and controlling the retention time of the material and the environment temperature in a crystal form control device so as to regulate and control the crystal form structure of the material. By accurately controlling the roasting process and optimizing material crystal form transformation, efficient removal of silicon in the coal gangue and efficient extraction of aluminum oxide are achieved, and the method has the advantages of being low in energy consumption, high in efficiency and good in environment friendliness and is suitable for large-scale industrial production.

The present invention belongs to the technical field of catalytic materials and relates to a silicon-aluminum material, its preparation and a low-coking, high-activity heavy oil conversion catalytic cracking catalyst. The silicon-aluminum material has an anhydrous weight chemical formula of (0-1)Na2O·(15-50)Al2O3·(85-50)SiO2, a most probable pore diameter of 10-100 nm, and a specific surface area of ​​150-600 m 2 / g, a pore volume of 0.5-1.5 ml / g, and a pore volume of pores with a pore diameter greater than 10 nm accounting for 70%-98% of the total pore volume. Its preparation method comprises the steps of adding an alkaline silicon source to an acidic aluminum source, contacting with a base, and washing. The low-coking, high-activity heavy oil conversion catalytic cracking catalyst contains the aforementioned silicon-aluminum material and an in-situ crystallized Y-type molecular sieve. The catalytic cracking catalyst has good coke selectivity.

The invention discloses a clean, efficient and low-cost lithium extraction slag utilization method which comprises the following steps: mixing lithium extraction slag with a fluxing agent, and sequentially carrying out roasting treatment, solid-liquid separation treatment, aging treatment and water leaching treatment to obtain a second solid-liquid mixture; carrying out solid-liquid separation treatment on the second solid-liquid mixture to obtain a second filter residue and a second filtrate; performing carbon separation method treatment on the first filtrate to obtain a third solid-liquid mixture; carrying out solid-liquid separation treatment on the third solid-liquid mixture to obtain a third filter residue and a third filtrate; the main component of the second filter residue and the third filter residue is white carbon black; performing heat treatment on the second filtrate and the third filtrate to obtain a fourth solid-liquid mixture; performing solid-liquid separation treatment on the fourth solid-liquid mixture to obtain fourth filter residues and fourth filtrate; the main components of the fourth filter residue are aluminum hydroxide and ferric hydroxide; and separating the fourth filtrate to obtain a sodium sulfate crystal substance and a potassium sulfate crystal substance.

Inorganic oxide particles having a D50 of 5.5-9.0 μm and a pressure loss of 1.75-2.81 kPa in air permeation at a pressure of 12 kPa.

The invention relates to a copper-based composite catalyst and a preparation method and application thereof.The copper-based composite catalyst comprises an inner core and a shell wrapping the surface of the inner core, the inner core comprises copper nanowires, and the shell comprises hydroxyl aluminum oxide. According to the copper-based composite catalyst provided by the invention, the surface of the copper nanowire inner core is coated with the aluminum hydroxide shell, and the aluminum hydroxide in the shell and the copper nanowire in the inner core construct a copper-oxygen-aluminum metal interface site on the surface of the inner core through the lewis acid-alkali interaction, so that the migration energy of the surface of copper atoms can be improved; the copper species in the inner core are stabilized, the reconstruction of the copper-based catalyst is avoided, and the selectivity and the stability of the copper-based composite catalyst are improved.

The invention relates to the technical field of solid waste recycling, and provides a secondary aluminum ash wet treatment resource utilization method which comprises the following steps: S1, a pretreatment step, S2, a slurrying reaction step, S3, a slurry impurity removal step, S4, an enhanced reaction step and S5, an oxidation reaction step. S6, a carbonization reaction step; s7, a flocculating settling step; s8, washing and separating; the step S1 is a pretreatment stage, the steps S2-S6 are wet reaction stages, the steps S7-S8 are solid-liquid separation stages, and the step S9 is a product drying stage, and the method has the effects that the secondary aluminum ash treatment process is simplified, the cost is reduced, and recycling products are enriched.

The application relates to the technical field of aluminum hydroxide, in particular to a preparation method of coarse-grained aluminum hydroxide; the preparation method comprises the following steps: continuously decomposing sodium aluminate solution through carbonation to obtain coarse-grained aluminum hydroxide slurry; drying the coarse-grained aluminum hydroxide slurry, and then performing multi-stage continuous screening and multi-stage air separation to obtain high-quality coarse-grained aluminum hydroxide products; the continuous decomposition through carbonation comprises continuously decomposing in a gradient-decreasing manner of aluminum oxide concentration; the particle size of the coarse-grained aluminum hydroxide products meets the requirements of D10>=145 mu m, D50>=220 mu m and D90>=300 mu m; the existing sodium aluminate decomposition stage is introduced with continuous carbonation decomposition, the continuous decomposition process is controlled in a gradient-decreasing manner of aluminum oxide concentration, and then the particle size of the dried aluminum hydroxide is accurately graded through multi-stage continuous screening and multi-stage air separation, so that the high-quality coarse-grained aluminum hydroxide products with concentrated particle size distribution are obtained.

The present application relates to the field of magnesium-aluminum composite oxide preparation, and discloses a magnesium-aluminum composite oxide and a preparation method thereof.The method comprises the following steps: (1) under anhydrous conditions, performing a first reaction on aluminum and a first aliphatic alcohol to obtain an alkoxide aluminum-containing material; (2) under the action of a catalyst, performing a second reaction on the alkoxide aluminum-containing material obtained in step (1), magnesium and a second aliphatic alcohol under anhydrous conditions; (3) performing hydrolysis on the reaction product of step (2) to obtain a magnesium-aluminum bimetallic alkoxide, and then performing optional drying and calcination to obtain a magnesium-aluminum composite oxide; wherein the first aliphatic alcohol and the second aliphatic alcohol each independently comprise n-pentanol and optionally n-hexanol. The preparation method of the magnesium-aluminum composite oxide provided by the present application can obtain a high-purity magnesium-aluminum composite oxide without subsequent purification treatment, and has the advantages of short initiation time and short reaction time.

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.

Thermally conductive particles contain at least a fired product obtained by firing an aluminum raw material, a zinc raw material, and an additional raw material other than the aluminum raw material and the zinc raw material. A content of the zinc raw material is in a range from 25 parts by mass to 70 parts by mass with respect to 100 parts by mass of the aluminum raw material. The additional raw material contains at least one selected from the group consisting of a boron compound, a tungsten compound, a titanium compound, a bismuth compound, and a fluorine compound, and a content of the additional raw material is in a range from 0.05 parts by mass to 20 parts by mass with respect to 100 parts by mass of the aluminum raw material. The thermally conductive particles satisfy predetermined conditions.

A catalyst for fluid catalytic cracking is provided which contains faujasite-type zeolite, boehmite, a binder and clay minerals and which satisfies the following formulas (1) and (2) in powder X-ray diffraction analysis: A / B ≤ 1 .2 A / C ≤ 0.8 where in formulas (1) and (2), A is the integrated intensity of a diffraction peak assigned to the (020) plane of boehmite, B is the integrated intensity of a diffraction peak assigned to the (120) plane of boehmite, and C is the integrated intensity of a diffraction peak assigned to the (33 1) plane of the faujasite-type zeolite.

The present invention relates to aluminum oxide including through-holes and, more specifically, to aluminum oxide having a novel structure in which density is reduced by a plurality of through-holes formed in parallel and adjacent to each other in each particle.

Disclosed are sorbent compositions for direct lithium extraction (DLE). The sorbent compositions include a lithiated aluminum component and an inorganic binder, and are in the form of shaped particles. The lithiated aluminum component makes up about 50% w / w to about 90% w / w of the sorbent compositions, whereas the binder makes up about 10% w / w to about 50% w / w of the sorbent compositions. Processes for producing the sorbent compositions are also provided, as are methods of using the sorbent compositions for DLE.

Metal component for high-temperature non-aqueous environments, comprising a body of metal material and a protective coating applied to an outer surface of the body of metal material, intended in use to contact a non-aqueous working fluid, wherein the protective coating includes at least one layer of amorphous aluminum oxide, the at least one layer of amorphous aluminum oxide comprising at least one doping element uniformly dispersed in the layer of amorphous aluminum oxide, the at least one doping element being selected from the group consisting of C, Na, K, Cs, Mg, Ca, Sr, P, Si, Fe, Y, Zr, Mo, W, La, Ce, Er, Yb.

A method of synthesizing aluminum oxide includes reacting a gallium and aluminum composite in a hydrogen evolution reaction with water to form an aluminum byproduct having at least one of aluminum hydroxide or aluminum oxyhydroxide. The method also includes removing the aluminum byproduct and calcinating the aluminum byproduct to form aluminum oxide.

The present invention discloses a method for withdrawing a decomposition tank, comprising the following steps: A. observing the height and distribution of the soft material wall of the decomposition tank to be withdrawn using a thermal imager; B. cutting off the process of the decomposition tank to be withdrawn and isolating the decomposition tank; C. opening the air valve closest to the highest point of the soft material wall, injecting decomposition mother liquor, and waiting for the soft material wall at that location to collapse; opening the remaining two air valves respectively, injecting mother liquor, and waiting for the soft material wall at that location to collapse, and closing the three air valves; D. injecting decomposition mother liquor from the wall valve of the decomposition tank to dilute the slurry around the wall valve; switching the large circulation to the previous decomposition tank, and then withdrawing the slurry in the decomposition tank to be withdrawn; E. injecting decomposition mother liquor from the three air valves and the wall valve of the decomposition tank to be withdrawn simultaneously, and then opening the large circulation pump to empty the diluted slurry, and finally emptying the remaining diluted slurry through the wall valve to complete the withdrawal. The method of the present invention can significantly improve the withdrawal effect.

The disclosure provides a method for recycling waste cathode by soluble calcium salt. The method for recycling waste cathode by soluble calcium salt comprises the following steps: S1, screening waste cathode; S2, mixing soluble calcium salt with water to prepare first slurry; S3, mixing first powder and the first slurry, and performing flotation under the assistance of ultrasonic, separating upper flotation foam, and then filtering to obtain first filtrate and first filter residue; S4, performing acid leaching on the first filter residue, and filtering to obtain second filtrate and second filter residue, wherein the second filter residue is calcium fluoride; S5, evaporating the second filtrate to obtain aluminum salt; and S6, evaporating and drying the first filtrate to obtain an alkali mainly containing sodium hydroxide.

The invention discloses a method for macroscopically preparing two-dimensional nanosheets based on an external field coupling technology, and belongs to the technical field of external field coupling and macroscopically preparing the two-dimensional nanosheets. Polyvinylpyrrolidone (PVP) is dissolved in absolute ethyl alcohol and stirred to form a uniform and transparent solution; adding acetone and metal precursor salt into the solution, and continuously stirring to obtain a uniform and stable precursor solution; carrying out gas jet spinning on the precursor solution through a needle head to obtain a composite nanosheet; and calcining the composite nanosheet in an air atmosphere to obtain the hierarchical porous metal oxide two-dimensional nanosheet. The method is convenient and efficient to operate, products are easy to obtain, macroscopic preparation can be achieved, and the green and environment-friendly production concept is met. According to the method, the fine structure of the two-dimensional nanosheet can be regulated and controlled by introducing a continuous air flow external field and only changing the three parameters of air pressure, the solution flow rate and the thickness of the needle head.

The present invention relates to a method for treating waste batteries, which comprises the following steps: preparing waste batteries including waste positive electrodes, wherein the waste positive electrodes include an aluminum current collector and a positive electrode active material layer formed on at least one surface of the aluminum current collector; heat-treating the waste batteries at a temperature of 650° C. or higher in an air atmosphere or an oxidizing atmosphere to convert the aluminum current collector into aluminum oxide; and recovering aluminum oxide powder and positive electrode active material powder from the heat-treated waste batteries.

The invention belongs to the technical field of ammonia gas production, and relates to a method for preparing ammonia gas by using urea in an alumina clinker kiln, which comprises the following steps: obtaining a urea solution; obtaining clinker kiln slurry; mixing the urea solution and the clinker kiln slurry to obtain a mixed solution; adjusting the temperature in the clinker kiln to a preset temperature; spraying the mixed solution into a running clinker kiln; obtaining ammonia gas produced by the mixed solution; the ammonia gas enters the denitration reactor along with the flue gas of the clinker kiln for denitration. According to the method for preparing the ammonia gas by using the urea in the alumina clinker kiln, a pyrolyzing furnace and an ammonia spraying grid are not needed, the construction cost of a denitration device can be saved, the consumption of electric energy is reduced, the preparation effect is good, and production halt loss caused by faults of the pyrolyzing furnace can be avoided.

The acid solubility of the product is larger than 95%, the median diameter is larger than or equal to 80 micrometers, the silicon content is smaller than or equal to 0.01%, and the product can be well applied to the industries of polyaluminum chloride and aluminum sulfate. The preparation method comprises the following steps: mixing an aluminum hydroxide source with a solvent, grinding until the median diameter of aluminum hydroxide in a seed crystal slurry is controlled in a range of 12-35 microns, adding the seed crystal slurry into a sodium aluminate fine liquid, carrying out seed decomposition while controlling parameters during seed decomposition, collecting the aluminum hydroxide with the median diameter of more than or equal to 80 microns, and carrying out vacuum drying, thereby obtaining the aluminum hydroxide powder with the median diameter of more than or equal to 80 microns. And washing and drying to obtain the aluminum hydroxide with high acid solubility and large particle size.

The application provides low-sodium sandy-shaped hydrogenated aluminum hydroxide and a preparation method thereof, and relates to the technical field of aluminum oxide production. The low-sodium sandy-shaped hydrogenated aluminum hydroxide is prepared by seed crystal decomposition under the synergistic effect of three factors, i.e. regulation of supersaturation, strengthening of the growth of gibbsite (001), (110) and (100) surfaces and promotion of the agglomeration of coarse particles. In the method, the seed crystal of aluminum hydroxide after the first classification or the second classification is transferred into a sodium aluminate solution for pretreatment, and then is introduced into a seed crystal decomposition first tank together with the remaining seed crystal and sodium aluminate concentrate for seed crystal decomposition. Active seed crystal is added in the middle stage of the seed crystal decomposition. The initial temperature of the seed crystal decomposition is controlled to be 65-80 DEG C, the final temperature is controlled to be 48-60 DEG C, the decomposition rate is more than 50% in 35-50 hours, and the low-sodium sandy-shaped hydrogenated aluminum hydroxide with Na2O less than 0.15% is obtained. The preparation method has the advantages of low investment, easy industrialization, high product quality and high decomposition rate, and is beneficial to the improvement of the competitiveness of the aluminum oxide production enterprises in China.