249results about "Aluminium oxides/hydroxides" patented technology

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.

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 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.

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.

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.

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 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 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.

Provided are alumina particles containing molybdenum and with their shape controlled. The alumina particles contain phosphorus and molybdenum. The alumina particles are preferably plate-like or card house-like. The phosphorus is preferably unevenly distributed in surface layers of the alumina particles. Also provided are a resin composition containing the alumina particles and a resin, a molded body made by molding the resin composition, and a method for producing the alumina particle including a step of firing the aluminum compound in the presence of a molybdenum compound and a phosphorous compound.

This composite member 100 comprises an inorganic matrix portion 10 that is configured from an inorganic substance including a metal oxide hydroxide, and metal fibers 20 that have an aspect ratio of 100 or greater and are present in a dispersed state within the inorganic matrix portion 10. The porosity in a cross-section of the inorganic matrix portion 10 of the composite member 100 is 20% or less.

This invention provides a dual-I-effect heating chamber system for an evaporator, comprising a separation chamber, two heating circulation lines, a water tank, and a downstream material conveying pipe. The separation chamber includes a feed end, a discharge end, and a steam outlet. The feed end is connected to the upstream material input pipe. Both heating circulation lines are connected to the discharge end and the steam outlet, and are connected in parallel. Each heating circulation line can independently circulate both material and gaseous substances. Operating valves are installed on the heating circulation lines to control their operation. The water tank is connected to both heating circulation lines to circulate gaseous substances. The downstream material conveying pipe is also connected to both heating circulation lines. This invention enables normal cleaning of the heating circulation lines without interrupting production.

The invention belongs to the technical field of aluminum smelting solid hazardous waste recycling, and particularly relates to a recycling method of aluminum oxide-rich complex electrolyte hazardous waste. According to the method, the complex aluminum electrolyte hazardous waste, aluminum salt and silicon-containing oxide are mixed and then subjected to segmented roasting-leaching treatment, fluorine in the electrolyte is converted into aluminum fluoride firstly and then converted into silicon tetrafluoride gas, separation of fluorine and aluminum and separation of gas and solid are achieved, and sodium and lithium elements are converted into soluble salt and further separated and recycled. According to the process, collaborative recovery and high-value utilization of various valuable elements in the complex aluminum electrolyte hazardous waste are achieved. The whole technological process is environment-friendly, toxic and harmful gas emission is avoided, secondary solid waste residues are not generated, the method has the advantages of being simple in process, high in recovery rate, high in product additional value and the like, and a feasible technical scheme is provided for resource utilization of the aluminum electrolysis solid waste.

The utility model provides high-purity aluminum oxide mixing and processing equipment, and belongs to the technical field of aluminum oxide. The high-purity aluminum oxide mixing processing equipment is characterized by comprising a reaction kettle; the motor is fixedly connected to the upper end of the reaction kettle; the rotating rod is fixedly connected to an output shaft of the motor; the stirring fan blades are fixedly connected to the circumferential surface of the rotating rod; the gas collecting box is fixedly connected to the circumferential surface of the reaction kettle; hydrogen generated during high-temperature reaction of aluminum oxide is collected into the gas collecting box through the first gas pipe by virtue of suction force of the suction fan, then the nitrogen cylinder is opened, and nitrogen is injected into the gas collecting box through the second gas pipe, so that the hydrogen is diluted, the explosion condition caused by excessive hydrogen content is prevented, and the safety of a working environment is improved; and the explosion or fire risk caused by hydrogen leakage is reduced.

The invention relates to a raw material preparation method for extracting aluminum oxide from aluminum-containing solid waste by alkaline sintering, which comprises the following steps: pretreating, proportioning and homogenizing raw materials to obtain homogenized raw materials, and the raw materials comprise fly ash, coal gangue, pulverized coal, calcium-containing solid waste and sodium carbonate; wherein the pretreatment comprises the following steps: crushing the raw materials, and controlling the crushing granularity of the process to be 120-220 meshes to form pre-powder; the batching comprises the steps of metering the pre-powder according to a process ratio, and batching to form a raw material; the homogenization comprises high-speed dry homogenization and low-speed wet homogenization, the raw material is firstly added into a high-speed dry homogenization machine for high-speed dry homogenization, and then the raw material is subjected to low-speed wet homogenization to obtain a homogenized raw material. According to the invention, solid wastes such as fly ash, coal gangue, carbide slag and the like, pulverized coal and sodium carbonate are crushed, a fully and uniformly mixed homogenized raw material is obtained through microcomputer metering automatic batching accurate control, dry homogenization and wet homogenization treatment, aluminum oxide can be extracted through alkaline sintering to prepare high-whiteness and high-purity aluminum hydroxide, and recycling of aluminum-containing solid wastes is realized.

This invention discloses a preparation process for low-porosity white fused alumina, comprising the steps of: (1) mixing white fused alumina particles with Al... 3+ Source, Zr 4+ After the source treatment solution is mixed and allowed to stand, the Al 3+ Source, Zr 4+ An excess of one of the sources. After completion, the white fused alumina particles are separated and placed in a mixed atmosphere of ammonia and water vapor for alkaline evaporation. Then, the obtained white fused alumina particles are calcined to obtain pretreated white fused alumina. (2) The pretreated white fused alumina is placed in a Fe solution containing the same molar ratio. 2+ Fe 3+ After mixing thoroughly in the treatment solution, the pretreated white fused alumina is allowed to stand. Once completed, the pretreated white fused alumina is separated and subjected to alkaline evaporation in a mixed atmosphere of ammonia and water vapor. The resulting pretreated white fused alumina is then calcined to obtain low-porosity white fused alumina. The above process of the present invention is suitable for post-treatment of finished white fused alumina with excessively high porosity, effectively reducing the porosity of this type of white fused alumina and improving its service life.

To provide plate-shaped alumina powder and a method for producing the same, which suppresses the scattered glare (shininess) compared to conventional plate-shaped alumina powder, even with the same particle size. [Solution] A plate-shaped alumina powder composed of a plurality of plate-shaped α-alumina particles, having an average particle diameter of 2 μm or more and 100 μm or less, and an average thickness of 0.2 μm or more and 3.0 μm or less, wherein the plate-shaped α-alumina particles are polycrystalline, and on the plate surface of the plate-shaped α-alumina particles, the average value of the ratio (L2 / L1) of the total length of grain boundaries to the perimeter length (L1) of the plate-shaped α-alumina particles to the total length of grain boundaries (L2) is 0.30 or more and 2.00 or less.

Embodiments described herein relate to removal of aluminum impurities from battery waste. In some aspects, a method for removing aluminum impurities includes pre-processing an amount of battery waste to improve removal of aluminum impurities from the amount of battery waste. The method further includes removing at least a portion of the aluminum impurities from the amount 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 amount of battery waste and regenerating the electrode material. In some embodiments, the removal may occur via screening, cyclonic separation, air separation, elutriation, and / or dissolution. In some embodiments, the doping precursor may include aluminum hydroxide (Al (OH) 3). In some embodiments, the regeneration includes applying a thermal treatment to the electrode material.

The present application aims to provide a gradient pore distribution alumina carrier and a preparation method thereof, and belongs to the technical field of alumina material synthesis. After calcination of pseudo-boehmite, the present application immerses the pseudo-boehmite into an organic alkali solution twice for hydrothermal treatment. During the hydrothermal treatment, the alumina grains are rehydrated and secondarily grown to form elliptical flaky pseudo-boehmite with a morphology. The elliptical flaky particles are stacked to form a large number of macropore channels. During the shaping of the carrier, the content of the elliptical flaky pseudo-boehmite in the mixture is adjusted to prepare the alumina carrier with gradient distribution of the channels. The alumina carrier has a high content of macropores in the shell layer, and the channels are wide. The pore structure is beneficial to the diffusion of macromolecular reactants to the inside of the carrier, and at the same time, the surface of the carrier has a strong anti-clogging ability.

To provide alumina particles containing molybdenum and controlled in shape.SOLUTION: Alumina particles contain phosphorus and molybdenum. The alumina particles are preferably plate-like or card-house-like. The phosphorus is preferably distributed unevenly on a surface layer of the alumina particles. A resin composition contains the alumina particles and a resin. A molded product is formed by molding the resin composition. A method for producing the alumina particles includes a step of firing the aluminum compound in the presence of a molybdenum compound and a phosphorus compound.SELECTED DRAWING: Figure 1

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.

Provided herein are methods and systems for producing alumina trihydrate (Al(OH)3) and / or alumina (Al2O3). The methods and systems utilize energy extracted from the aluminum-water reaction to power the conversion of various aluminum sources to alumina trihydrate.

This utility model discloses an energy-saving forced-efficiency evaporation device for alumina production, including an evaporator flash evaporator, a forced circulation separator, a primary forced-efficiency heater, a feed mother liquor inlet, a discharge mother liquor pipe, and a secondary forced-efficiency heater. After the forced-efficiency circulation evaporation device is arranged, a primary forced-efficiency heater and a secondary forced-efficiency heater are respectively set at the inlet and outlet of the forced circulation separator. The area of ​​the two forced-efficiency heaters is half of the original area. The total area of ​​the two heaters will not be reduced, but the area of ​​a single forced-efficiency heater is reduced by 50%. Therefore, the amount of mother liquor required for circulation can be reduced by about 50%, and under ideal conditions, the flow rate of the forced-efficiency circulation pump can be reduced by about 50%.

The invention belongs to the technical field of industrial solid waste recycling and environmental protection, discloses a red mud total recycling and innocent treatment method based on material internal circulation, and solves the problem of high dependence degree on external materials in the current red mud treatment process. The method comprises the following steps: calcining red mud and then performing acid leaching; adding sodium carbonate while heating the pickle liquor to co-precipitate iron and aluminum in one step, and collecting CO2; washing the precipitate to obtain iron-aluminum concentrate and a sodium chloride solution; cO2 is introduced into a NaOH solution to prepare sodium carbonate; the sodium chloride solution is converted into NaHCO3 and NH4Cl through a Hou's alkali preparation method, and NaHCO3 is calcined to obtain Na2CO3 and CO2; regenerating NaOH from the Na2CO3 solution through a causticization method; and extracting silicon from acid leaching residues by using regenerated NaOH to produce white carbon black. The method disclosed by the invention fundamentally avoids the generation of high-salinity wastewater, synchronously and efficiently recovers iron, aluminum, silicon and sodium resources, and has remarkable economic and environmental benefits.