532results about "Aluminium oxides/hydroxides" patented technology

The invention provides a preparation method of macroporous high-hydrothermal-stability aluminum oxide and pseudo-boehmite, and the preparation method of the pseudo-boehmite comprises the following steps: step 1, adding an aluminum salt solution and an alkali solution into a rotating liquid membrane reactor at the same time, and nucleating at 20-30 DEG C to obtain nucleating slurry; wherein the rotating speed of the rotating liquid film reactor is 500 to 1200 rpm, and the stator-rotor gap of the rotating liquid film reactor is 0.1 to 0.3 mm; and step 2, transferring the nucleation slurry into a crystallization reaction device, crystallizing at 70-90 DEG C, and then carrying out solid-liquid separation and drying to obtain the pseudo-boehmite. The most probable pore size of the aluminum oxide prepared by the method is 6-12nm, the specific surface area is 150-600m < 2 > / g, and the aluminum oxide can still keep higher specific surface area after being subjected to hydrothermal treatment for 120 hours.

The present disclosure relates to the field of sodium-ion battery technology, and specifically, to a method for preparing carbon-coated sodium iron fluorophosphate from waste lithium iron phosphate and the application thereof. The method for preparing carbon-coated sodium iron fluorophosphate from waste lithium iron phosphate includes: mixing a waste lithium iron phosphate material with an alkaline solution for reaction, followed by solid-liquid separation, to obtain an aluminum-containing filtrate and a lithium iron phosphate filter residue; mixing the lithium iron phosphate filter residue, aluminum chloride and sodium chloride uniformly, followed by vacuum calcination, to obtain a calcination material; and mixing the calcination material with at least one of a sodium source, an iron source and a phosphorus source uniformly to obtain a mixture to which a fluorine source, a carbon source and a solvent are added for uniformly mixing, followed by drying and calcination sequentially to obtain the carbon-coated sodium iron fluorophosphate. The method has the advantages of low costs, a high added value, a short process, and a high recovery rate, and the carbon-coated sodium iron fluorophosphate obtained from the method has excellent electrochemical performance.

The invention provides a large-area coated lithium manganate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials, and the large-area coated lithium manganate positive electrode material comprises a lithium manganate positive electrode material body subjected to grain boundary pretreatment and a coating layer coating the surface of the lithium manganate positive electrode material body. The general molecular formula of the lithium manganate positive electrode material body subjected to grain boundary pretreatment is Li < 1 + a > Mn < 2-b > MbO4, M is a doping element, a is more than or equal to-0.1 and less than or equal to 0.3, and b is more than or equal to 0 and less than or equal to 0.3; the surface coating layer comprises an M'coating element. The lithium manganate positive electrode material body subjected to grain boundary pretreatment can realize large-area coating, and the lithium manganate positive electrode material subjected to special grain boundary pretreatment and large-area coating has excellent structural stability, so that corrosion of an electrolyte to lithium manganate is relieved, Mn dissolution at a high temperature is inhibited, and the lithium manganate positive electrode material has good electrochemical performance. Therefore, the lithium manganate positive electrode material has excellent high-temperature circulation and high-temperature storage performance, and the method is simple in process and can be implemented and popularized.

Embodiments described herein relate to removal of aluminum impurities from battery waste. In some aspects, a method for removing aluminum impurities includes preprocessing a quantity of battery waste to improve removal of aluminum impurities from the quantity of battery waste. The method further includes removing at least a portion of the aluminum impurities from the quantity of battery waste, modifying the removed aluminum impurities to form a coating precursor and / or a doping precursor, and applying the coating precursor and / or the doping precursor to an electrode material. In some embodiments, the method further includes characterizing the aluminum impurities in the quantity of battery waste and regenerating the electrode material. In some embodiments, the removing can be via sieving, cyclone separation, air separation, elutriation, and / or dissolution. In some embodiments, the doping precursor can include aluminum hydroxide (Al(OH)3). In some embodiments, the regenerating includes applying a heat treatment to the electrode material.

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.

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 belongs to the technical field of catalyst carriers, and particularly relates to a preparation method of a super-macroporous residual oil hydrodemetallization tooth spherical alumina carrier. Aluminum hydroxide and deionized water are mixed and peptized, a modifier is added to regulate and control the pore structure of the aluminum hydroxide, a pore-enlarging agent and a sintering aid are added into a muddy material, and uniformly-distributed pore structures can be formed in an alumina carrier under the action of the pore-enlarging agent and the sintering agent in the roasting process, so that the pore-enlarging effect of the alumina carrier is improved; and the pore structure is further expanded through roasting, so that the pore volume and the macropore ratio in the alumina carrier are improved. In addition, hydroxyl groups on the surface of the alumina carrier are subjected to condensation reaction in the roasting process, so that the acidity of the carrier is effectively reduced, and the corresponding catalytic performance is improved.

The present invention relates to a method for recycling secondary aluminum ash and its application, wherein the method comprises the following steps: S1, pre-treating the secondary aluminum ash by heating and washing, then mixing it with ammonium sulfate, roasting and water-immersing it to obtain a leachate, then cooling and crystallizing the leachate, separating the solid, and calcining it to obtain aluminum oxide; S2, hydroxylating the aluminum oxide to obtain hydroxylated aluminum oxide; S3, blending the hydroxylated aluminum oxide with carboxymethyl cellulose, and reacting it by ultrasonic heating to obtain modified aluminum oxide. The present invention improves the dispersibility, compatibility and stability of the modified aluminum oxide in composite materials while efficiently recycling the secondary aluminum ash, and can significantly improve product performance by using it as a filler in the fields of polymer materials and the like.

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.

The present application provides a method for preparing battery-grade lithium carbonate from clay-type lithium ore, and relates to the field of resource utilization of clay-type lithium ore. The method for preparing battery-grade lithium carbonate from clay-type lithium ore includes: roasting, leaching, and deironing the clay-type lithium ore to obtain a deironed solution; mixing the deironed solution with an inorganic base to react to obtain a lithium-containing aluminum hydroxide precipitate adsorbent; performing lithium-aluminum separation on the lithium-containing aluminum hydroxide precipitate adsorbent to obtain aluminum oxide powder and a lithium-containing solution; performing calcium and magnesium removal treatment on the lithium-containing solution and concentrating it into a lithium-rich solution; deeply purifying and removing impurities from the lithium-rich solution to obtain a purified lithium-rich solution; reacting the purified lithium-rich solution with sodium carbonate to obtain battery-grade lithium carbonate. The present application can make full use of the lithium resources in the clay-type lithium ore, with a high resource utilization rate of lithium, and can produce high-value-added battery-grade lithium carbonate. The present application can also make full use of the aluminum resources in the clay-type lithium ore to produce high-grade alumina products as a by-product.

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 invention relates to a comprehensive utilization major cycle process in cooperative treatment of industrial flue gas pollutants, which comprises the following steps: removing SO2 and NOx in flue gas by adopting an adsorption method, and desorbing SO2 and NOx by adopting a water solution method to generate sulfuric acid and nitric acid; sulfuric acid reacts with sodium chloride to produce hydrochloric acid; sulfuric acid, nitric acid and hydrochloric acid are combined into a composite acid solvent, the solvent dissolves aluminum oxide in the fly ash to be converted into polybasic acid aluminum, the polybasic acid aluminum is subjected to ammonification decomposition into aluminum hydroxide and composite acid ammonium, the composite acid ammonium reacts with calcium carbonate to generate NH3, CO2 and polybasic acid calcium, and the polybasic acid calcium reacts with sodium sulfate to generate nano calcium sulfate; the method comprises the following steps: reacting silicon dioxide with sodium hydroxide to generate sodium silicate, reacting sodium silicate with sodium bicarbonate to generate silicic acid and sodium carbonate, reacting sodium carbonate with calcium hydroxide to generate calcium carbonate and sodium hydroxide, and mixing multi-element metal oxide separated from aluminum and silicon extraction with silicon dioxide and aluminum hydroxide which are separated and carried to prepare a multi-element cation molecular sieve; and comprehensive utilization and large circulation of the flue gas pollutants are realized through the synergistic effect of the pollutants.

A thermally conductive filler includes: coarse inorganic particles; and the small inorganic particles, wherein the coarse inorganic particles includes large fused alumina particles having an average particle size in the range of 20 μm or more and 50 μm or less and the medium inorganic particles having an average particle size in the range of 1.0 μm or more and 10 μm or less, in a mass ratio of 60:40 to 100:0, the small inorganic particles have an average particle size of 0.1 μm or more and less than 1.0 μm, and a content of the small inorganic particles is in a range of 15% by mass or more and 30% by mass or less.

A method and equipment for recycling alumina red mud. First, the alumina red mud is added to a mixed acid of hydrochloric acid and sulfuric acid for reaction to dissolve metals such as iron, aluminum, calcium, sodium, and a small amount of zinc, copper, magnesium, etc., and the solid silicon dioxide is left to be separated as building materials or glass raw materials; after the solution is collected, ammonium bicarbonate is added to obtain aluminum, calcium, and some metal precipitates and separated. Iron and sodium remain in the solution and continue to react with sodium hydroxide to obtain iron hydroxide precipitate and separate out sodium salts. After evaporation of the concentrated solution, iron oxide is obtained as a raw material for steel production; the aluminum, calcium, and other metal precipitates are added to sulfuric acid with a concentration of 90-98% for reaction. After all are dissolved, the solution is subjected to membrane separation and then carbonates are added to obtain calcium carbonate precipitate as a raw material for cement production; after evaporation of the concentrated solution, high-purity alumina is obtained and sent to an aluminum processing plant to produce pure aluminum or aluminum alloy products; the separated sodium salt solution is evaporated to be used as industrial and agricultural salt; the acid mist and harmful gases in the reactor process are treated by an absorption tower and then discharged. The present invention can make full use of the iron oxide, alumina, and effective components of alumina red mud, solves the problem of environmental pollution caused by the large amount of piled-up alumina red mud at present, has a low cost, and is suitable for the current alumina production plants.

The invention discloses nano aluminum oxide prepared from fly ash as well as a method and application thereof. The nano aluminum oxide is prepared by four process steps of alkali fusion activation, acid leaching, desilicication and nano aluminum oxide synthesis. The method comprises the following steps: mixing and grinding fly ash and sodium carbonate in proportion, and performing alkali fusion activation at high temperature; carrying out acid leaching treatment on the activated product and hydrochloric acid, and washing and filtering after a gelation process to obtain a desiliconized solution; adding excessive sodium hydroxide into the desiliconized solution for alkali treatment, filtering, and dissolving sodium alginate in supernate as a thickening agent; and dropwise adding the sol into an aluminum chloride solution to form an aluminum precursor, carrying out precipitation separation, and carrying out high-temperature calcination on the precursor in a muffle furnace to obtain the final nano aluminum oxide. According to the method disclosed by the invention, the nano aluminum oxide is creatively prepared from the fly ash, a new scheme is provided for realizing high-value recycling of the fly ash, the preparation cost of the nano aluminum oxide is reduced, and sustainability and a wide application prospect are shown.

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.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for strengthening dissolution and iron separation and recovery of monohydrate bauxite. The method comprises the following steps: (1) preparing mixed ore pulp from the monohydrate bauxite, the sodium aluminate circulating mother liquor and an additive; the additive is chitin biomass or a derivative thereof; and (2) the mixed ore pulp obtained in the step (1) is heated to 190-280 DEG C for a dissolution reaction, dissolution slurry and dissolution residues are obtained, the dissolution residues are subjected to magnetic separation and recovery, and iron ore concentrate is obtained. According to the method, the bauxite can be efficiently dissolved out, the problem of combination of iron minerals and silicon minerals in the high-iron bauxite is solved, and the problem that iron resources in the high-iron bauxite are difficult to utilize is solved more efficiently at low cost.

The invention relates to an electrolytic aluminum waste cathode carbon resource recycling method which comprises the following steps: S1, mixing aluminum electrolysis waste cathode carbon with aluminum salt, and carrying out dry ball milling to obtain a ball milling material; s2, the ball-milled material is leached with an acid solution and filtered, and first-section leached residues and first-section leached liquid are obtained; s3, mixing the first-stage leaching residues with solid alkali, and roasting to obtain a sintered material; washing and filtering the sintered material to obtain second-stage filtrate and filter residues, and drying the second-stage filter residues to obtain a carbon product; and S4, adding the second-stage filtrate into the first-stage leachate until the pH value is 4.5-7.5, aging, filtering to obtain a third-stage leachate and third-stage filter residues, and roasting the third-stage filter residues to obtain an aluminum-fluorine product. According to the method, the waste cathode carbon is leached in the aluminum salt low-acid environment, the reaction environment is milder, and meanwhile the leaching efficiency is not reduced. And through further low-temperature alkali fused salt roasting, fluoride in the waste cathode carbon is removed, and the purity of the obtained carbon product is high.

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 discloses a lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The positive electrode material comprises a main body material as well as a metal oxide coating layer and a carbon layer which sequentially coat the main body material from inside to outside, the general chemical formula of the main body material is Li < x > Na < 1-x > CoO2; and the crystal phase of the main body material is an O2 phase. The positive electrode material can be used for preparing a lithium ion battery, and is prepared by the following steps: S1, mixing and sintering a sodium source and a cobalt source to obtain a P2-phase precursor; s2, preparing O2-phase lithium cobalt oxide from the P2-phase precursor and a lithium source; and S3, mixing the O2-phase lithium cobalt oxide with organic metal salt, and sintering at low temperature. According to the method, O2-phase lithium cobalt oxide is coated in a low-temperature sintering mode, compared with an existing coating mode, the coating effect is good, and coating elements cannot be diffused into the main body material.

Provided is an alumina powder which gives a resin composition exhibiting a satisfactory thermal conductivity and a satisfactory shear adhesion strength.　The alumina powder has a 50% volume-cumulative diameter D50 of 10-70 μm and gives a volume-based particle size frequency distribution which has a first-peak maximal value in a particle diameter range of 20 μm and larger and a second-peak maximal value in the particle diameter range of 1-20 μm, excluding 20 μm.

Disclosed is a method for recovering valuable metals from a waste battery according to various embodiments of the present invention for realizing the objective described above. The method may include the steps of: performing heat treatment on an object corresponding to a waste lithium ion battery through a heat treatment device; performing a crushing process using a crushing device in correspondence to the object recovered after the heat treatment, to obtain a plurality of recovery bodies; performing a filtering process on the plurality of recovery bodies through a sieving device to obtain a plurality of separation bodies having different particle sizes; performing a leaching process using a leaching device in correspondence to a first one among the plurality of separation bodies to separate lithium carbonate from the first separation body and obtain a valuable metal oxide; performing a pulverizing process on the valuable metal oxide through a pulverization device to refine the valuable metal oxide; obtaining mixed powder from the refined valuable metal oxide through a magnetic separation process using a magnetic separation device; and separating the valuable metal oxide from which the mixed powder has been removed into a plurality of sub-oxides on the basis of the difference in specific gravity between components by using a specific gravity separation device.

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.