1221results about "Aluminium compounds" patented technology

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention belongs to the technical field of desiliconized fly ash, and particularly relates to a high-alumina-silica-ratio material capable of replacing bauxite as well as a preparation method and application of the high-alumina-silica-ratio material. The preparation method comprises the following steps: S1, crushing coal gangue, and grinding the crushed coal gangue until the particle size is less than 40 meshes to obtain a ground material; s2, mixing the ground material and a catalyst according to a weight ratio of 100: (1-2), roasting, and cooling to obtain activated coal gangue; the catalyst comprises sodium carbonate, calcium oxide and aluminum oxide in a weight ratio of 1: (0.3-0.5): (1.4-1.6); s3, mixing a sodium hydroxide solution, the activated coal gangue and a surfactant, and reacting at 50-90 DEG C for 1-6 hours to obtain desiliconized slurry; and S4, filtering the desiliconized slurry, collecting a solid phase, washing with water, and drying to obtain desiliconized fly ash, namely the high alumina-silica ratio material capable of replacing bauxite. The method is high in desiliconization rate.

The invention relates to the technical field of lithium ion batteries, in particular to a composite lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The composite lithium-rich manganese-based positive electrode material is of a three-layer structure and sequentially comprises a lithium-rich manganese-based oxide positive electrode material matrix, a first coating layer and a second coating layer from inside to outside, the first coating layer is a mixture of halide solid electrolyte and lithium-containing oxide; and the second coating layer is an oxide solid electrolyte. The conductivity of a contact interface with a positive electrode material can be improved, the resistance is reduced, the moisture absorption degradation of halide is inhibited, the packaging difficulty is reduced, and the cycle performance of the halide-added solid electrolyte after moisture absorption is improved.

The invention relates to the technical field of non-ferrous metallurgy, and discloses a dissolution method of high-iron-monohydrate-boehmite type bauxite. The method comprises the following steps: (1) preparing mixed ore pulp from high-iron monohydrate bauxite, sodium aluminate circulating mother liquor and an additive; the additive is one or a mixture of more of organic alkali, carboxylic acid and amino acid; (2) the mixed ore pulp is subjected to ultrasonic treatment and then 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; the power of the ultrasonic treatment is 200 to 300W, and the time of the ultrasonic treatment is 30 to 50 minutes. According to the method, the problem that iron minerals are difficult to separate due to silicon minerals in the dissolution process of the high-iron monohydrate bauxite is solved. The method is simple in process, low in production cost, low in equipment requirement and good in industrialization prospect.

The application discloses a kind of derived biomass hard carbon material pulverization process, belong to biomass charcoal material processing technical field, first, pulverization process includes the following steps: after drying, the coconut shell derived hard carbon block is carried out primary crushing, while spraying first modifier, obtain the particle size 1~3mm of coarse crushing modified particle;Coarse crushing modified particle is carried out secondary precision crushing under argon atmosphere, while spraying second modifier, obtain the precision crushing modified particle of D 50 Particle size is 15 μm;Precision crushing modified particle is carried out roll grinding spheroidization, while spraying third modifier, obtain the spherical modified particle of D 50 Particle size is 10 μm;Spherical modified particle is carried out flash drying after cooling, then add magnesium stearate to it, after mixing, obtain derived biomass hard carbon material.Then, the application realizes breakthrough in tap density, particle size distribution, first efficiency and other core indexes by the coordination of three-stage gradient modification and progressive pulverization process.

The invention relates to the technical field of catalyst carriers, and discloses reticular porous spherical aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing an aluminum source, acid, a pore-forming agent, a surfactant and water to obtain pseudo sol; (2) performing ultrasonic treatment and oil ammonia column forming treatment on the pseudo sol obtained in the step (1) to obtain gamma-Al2O3 spherical gel beads; and (3) aging, washing, drying and calcining the gamma-Al2O3 spherical gel beads obtained in the step (2) to obtain the reticular porous spherical alumina. The spherical aluminum oxide prepared by the method has abundant communicated reticular pore channels, is obviously distributed in mesopore and macropore ranges, is beneficial to obviously improving dispersion and loading of a catalyst in an aluminum oxide carrier and improving the performance of petroleum reforming and propane dehydrogenation, and has industrial production utilization value and commercial value.

The invention discloses a silicon / graphite / carbon-aluminum oxide composite negative electrode material and a green preparation method thereof, and belongs to the technical field of lithium ion batteries. Aiming at the problems of high volume expansion rate and poor cycling stability of a silicon-based negative electrode and high cost of a traditional process, the invention innovatively provides the following scheme: 1) waste photovoltaic silicon wafer ball-milling liquid and waste graphite are taken as core raw materials, and resource recycling is realized; (2) phenolic resin and chitosan are adopted as double carbon sources, a nitrogen-doped carbon layer (the nitrogen content is 3-5 wt.%) is formed through pH-induced self-assembly, and the conductivity and the Li < + > diffusion rate are synchronously improved; and 3) aluminum nitrate is introduced for pyrolysis to generate 2-5nm aluminum oxide for doping, so that the side reaction of the electrolyte is inhibited, and the volume expansion of silicon is relieved (the expansion rate is less than or equal to 120%). The preparation process comprises the steps of silicon / graphite dispersion, double-carbon-source compounding, ammonia water regulation and control precipitation and gradient calcination. Experiments show that the specific capacity of the optimized material under the current of 0.5 A / g reaches more than 800mAh / g, the 100-time cycle capacity retention ratio is more than 98%, the 1000-time cycle capacity retention ratio is more than 80%, the reversible specific capacity under the multiplying power of 3A / g is more than 550mAh / g, and the raw material cost is reduced by 40%. The invention has the advantages of high capacity, long service life, environmental protection and economy, and provides an innovative solution for the fields of power batteries and energy storage.

The invention provides a method and system for separating and washing red mud in aluminum oxide production, and the method comprises the following steps: pretreating red mud slurry to improve the filtering performance of the red mud slurry; filtering the pretreated red mud slurry under set filtering conditions to form a red mud filter cake; in the filtering process, when the thickness of the dehydrated red mud filter cake reaches a set thickness, dehydrating the red mud filter cake so as to reduce the moisture content of the dehydrated red mud filter cake; performing multi-stage countercurrent washing on the dehydrated red mud filter cake to obtain a countercurrent washing solution; and carrying out purification treatment and concentration treatment on the countercurrent washing liquid, and returning the countercurrent washing liquid subjected to purification treatment and concentration treatment to the multi-stage countercurrent washing step as a washing liquid for cyclic utilization. The problem that the resource recycling rate is low in the red mud separating and washing process in aluminum oxide production is effectively solved.

The invention relates to a method for recycling aluminum, iron and lithium from waste lithium iron phosphate batteries. The method comprises the following steps: firstly, separating a positive electrode material of a waste battery cell, removing a binder through high-temperature treatment, adding the positive electrode material into a NaOH solution and a viscous liquid cosolvent, finally stirring and dissolving, neutralizing and adjusting the pH value through sulfuric acid, and precipitating and recovering aluminum; then sulfuric acid is matched with hydrogen peroxide, residual filter residues are stirred and dissolved, the pH value is adjusted in multiple steps, iron and lithium are precipitated respectively, and Fe (OH) 3 and Li2CO3 precipitates are obtained in sequence; the viscous liquid cosolvent disclosed by the invention is prepared from 1-aminoethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt and boric acid powder; the recovery rate of aluminum, lithium and iron is high, the recovery cost is low, and the economic value is high.

The invention belongs to the field of functional composite materials, and particularly relates to low-viscosity and high-dispersity aluminum oxide slurry and a preparation method thereof.The low-viscosity and high-dispersity aluminum oxide slurry is prepared from a newly-designed phosphono-carboxyl block copolymer and biquaternary ammonium salt polyether silane as composite modifiers; and efficient anchoring and stable dispersion of the surfaces of alumina particles are realized through the synergistic effect of molecular structures. The phosphono-carboxyl block copolymer is prepared through controllable polymerization and deprotection reaction, and strong chemical bonding is formed between a phosphono group and the surface of aluminum oxide; the biquaternary ammonium salt polyether silane is subjected to click chemical synthesis, and electrostatic adsorption of quaternary ammonium salt and the steric hindrance effect of a polyether chain are combined. When the slurry is prepared, the two modifiers are sequentially added into water, the aluminum oxide powder is added after the pH value is adjusted, finally, the isobutylene maleic anhydride copolymer and the defoaming agent are introduced, and the slurry is obtained through vacuum defoaming and filtering. The slurry prepared by the method has the characteristics of high solid content, low viscosity and good dispersion stability.

The invention discloses a process for producing polyaluminum chloride by recycling aluminum ash. The process comprises a primary aluminum ash pretreatment process, a secondary aluminum ash deamination process, an ammonium chloride crystallization process, a liquid polyaluminum chloride process and a solid polyaluminum chloride process, the primary aluminum ash pretreatment procedure comprises a first cyclone separator, a ball mill, a screening machine and a bag-type dust collector, the input end of the first cyclone separator is connected with a primary aluminum ash bin through conveying equipment, the coarse ash end of the first cyclone separator is connected with a feeding port of the ball mill, and a discharging port of the ball mill is connected with a feeding port of the screening machine; fine powder screened by the screening machine and secondary aluminum ash fine powder discharged by the first cyclone separator are collected into a secondary aluminum ash bin, and dust outlets of the first cyclone separator, the ball mill and the screening machine are connected with a dust inlet of the bag-type dust collector through pipelines. By arranging a series of structures, the produced polyaluminum chloride is high in purity, the economic benefit of the process is improved, tail gas is washed, and the pollution is reduced.

The invention discloses a method for preparing graphene coated inorganic nonmetal powder through chemical vapor deposition and a composite material prepared by the method. According to the method, graphene directly grows on the surface of inorganic non-metal powder through chemical vapor deposition to obtain the graphene-coated inorganic non-metal powder composite material, a metal catalyst and / or a non-metal catalyst are / is adopted in vapor deposition, the metal catalyst is fixed in a low-temperature area of a reactor for chemical vapor deposition, and the non-metal catalyst is fixed in a low-temperature area of the reactor for chemical vapor deposition. The temperature of the low-temperature region is lower than the melting point of the metal catalyst. According to the method, the catalyst (including the non-metal catalyst and / or the metal catalyst) is introduced into vapor deposition, high-quality graphene can be grown on the surface of the non-metal powder under the catalytic action of the catalyst, amorphous carbon and other impurity phases in the composite material are reduced, meanwhile, the use amount of hydrogen can be reduced, and the production safety can be improved.

To provide a surface-treated inorganic oxide in which the surface of an inorganic oxide such as an inorganic filler or an inorganic pigment is treated with a specific polymer treating agent, and which exhibits enhanced dispersibility, compatibility, and fillability with respect to various media.SOLUTION: Provided is a surface-treated inorganic oxide that is a treated product in which an inorganic oxide is surface-treated with a polymer treating agent. The polymer treating agent is a polymer whose number-average molecular weight is 6,000 to 30,000, including a constitutional unit (1) derived from a monomer 1 represented by general formula (1), a constitutional unit (2) derived from a monomer 2 such as (meth)acryloyloxypropylmethyldimethoxysilane, and an optional constitutional unit (3) derived from a vinyl monomer. (R1 represents a hydrogen atom or a methyl group. A represents O or NH. X represents an ethylene group or a propylene group. Y represents O, NHCOO, or NHCONH. Each R2 independently represents a hydrogen atom or a methyl group. R3 represents an alkyl group having 1 to 18 carbon atoms.)SELECTED DRAWING: None

The invention provides a preparation method of low-sodium high-temperature alpha-phase alumina micro powder, and belongs to the technical field of alumina powder. The preparation method comprises the steps of acid leaching, coating and post-treatment. The coating step comprises the following steps: adding a silica sol solution into an acid-leached aluminum oxide suspension for the first time, stirring at 74-78 DEG C for 1.0-1.4 hours, then adding the silica sol solution for the second time, stirring for 1.0-1.5 hours while keeping the temperature, then adding the silica sol solution for the third time, and stirring for 0.8-1.2 hours at 62-65 DEG C to obtain silica sol-coated aluminum oxide; the alpha-phase alumina micropowder prepared by the preparation method disclosed by the invention is uniform in particle size, low in sodium oxide content, high in alpha-phase conversion rate and good in powder fluidity.

The invention discloses a method for preparing a water purifying agent polyaluminum chloride by recycling secondary aluminum ash, which comprises the following steps: S1, mixing the secondary aluminum ash with a composite additive solution, stirring and reacting at 70-90 DEG C, then carrying out solid-liquid separation, and drying the solid; s2, the obtained pretreated aluminum ash and calcium carbonate are mixed, pre-roasted at the temperature of 900-1000 DEG C and then fused at the temperature of 1300-1400 DEG C, and cooling is conducted; and S3, firstly adding the obtained roasted material into 20-25wt% of hydrochloric acid, heating the obtained slurry to 80-105 DEG C, stirring and leaching, then adding water into the acid leaching solution to dilute until the final concentration of the hydrochloric acid is 5-10wt%, then heating to 80-105 DEG C, continuing stirring and leaching, cooling and filtering, and concentrating and crystallizing the filtrate to obtain the polyaluminum chloride. According to the method, the quality of the polyaluminum chloride is greatly improved through the methods of oxidation enhanced water washing, two-stage dynamic roasting, gradient acid leaching, by-product recovery and the like.

The invention belongs to the technical field of spherical aluminum oxide preparation, and particularly discloses a method for preparing spherical aluminum oxide through an oil ammonia column forming process. The preparation method comprises the following steps: firstly, uniformly mixing pseudo-boehmite or boehmite powder with a dilute acid solution to prepare aluminum sol; the upper layer of the oil ammonia column is an oil phase, the lower layer of the oil ammonia column is an ammonia water phase containing a macromolecular thickening agent, and a surfactant is added to an interface while the aluminum sol is dropped into the oil ammonia column through a forming needle, so that the aluminum sol is pelletized and gelled and cured. And finally, taking out the gel beads, drying and roasting to obtain the spherical alumina carrier. The spherical aluminum oxide prepared by the method is high in sphericity degree and high in crushing strength, and can be used as a catalyst carrier for various catalytic reactions.

The invention discloses a treatment method of a lithium extraction leachate and a production method of lithium carbonate, wherein the treatment method can be used for efficiently recycling an aluminum resource in the leachate. The treatment method of the lithium extraction leachate comprises the following steps that 100, potassium sulfate is added into the lithium extraction leachate, and first liquid is obtained after the potassium sulfate is dissolved; step 200, performing freezing crystallization and solid-liquid separation treatment on the first liquid to obtain crude alum and lithium extraction mother liquor; step 300, dissolving crude alum in a solvent to obtain a second liquid; step 400, performing freezing crystallization and solid-liquid separation treatment on the second liquid to obtain high-purity alum and filtered mother liquor; wherein at least one of the lithium ion concentration, the rubidium ion concentration and the cesium ion concentration in the filtered mother liquor serves as a monitoring object to be monitored, when the monitoring object is larger than or equal to a threshold value, the filtered mother liquor and the lithium extraction mother liquor are mixed, and when the monitoring object is smaller than the threshold value, the filtered mother liquor serves as a solvent of crude alum.

A well-cementing cement stone reinforcing material and the use thereof. The well-cementing cement stone reinforcing material comprises, according to a mass ratio: 30-50 parts of an active spherical α-Al2O3 micropowder, 30-50 parts of spherical fly ash, 5-20 parts of nano metakaolin, 5-10 parts of a hydrophilic rubber powder, and 5-10 parts of hydrophilic carbon fibers. Adding the well-cementing cement stone reinforcing material to a cement slurry of an oil-gas well can promote the generation of a crystal phase having stable high-temperature strength during the hydration process of the cement slurry, thereby improving the high-temperature strength of cement stone; and can solve the problems of a decline in strength and an increase in permeability of the well-cementing cement stone in an ultra-high temperature environment, thereby effectively ensuring the long-term sealing integrity of a wellbore in an ultra-high temperature environment and preventing the annular pressure of an oil-gas well caused by cement ring damage.

To provide an alumina aqueous dispersion useful in forming a refractory by firing ceramic or the like, without leaving residual carbon even when firing is carried out at a temperature of 600°C or below.SOLUTION: The present invention provides an alumina aqueous dispersion containing alumina particles as dispersed particles, i.e., an alumina aqueous dispersion satisfying the following characteristics: (1) an average particle size of the dispersed alumina particles measured on the basis of number of particles is in a range of 10 to 1000 nm, (2) crystal systems of the alumina particles when the alumina aqueous dispersion is dried at 100°C, are amorphous and / or x-alumina, (3) the pH of the alumina aqueous dispersion is in a range of 2.0 to 5.3, (4) the alumina aqueous dispersion contains an organic acid and an alkali, with the organic acid being formic acid or a combination of formic acid and acetic acid, and the alkali being ammonia and, (5) the concentration of alumina (Al2O3) contained in the alumina aqueous dispersion is 0.5 to 11.5 mass%, and a method of producing the same.SELECTED DRAWING: Figure 1

The invention relates to the technical field of battery positive electrode materials, discloses a manganese-based battery positive electrode material precursor as well as a preparation method and application thereof, and belongs to the technical field of battery preparation. According to the technology for preparing the manganese-based battery positive electrode material precursor, a solid-phase method is mainly adopted, a high-temperature melting technology is adopted, the manganese-based positive electrode material is subjected to doping modification through multiple elements at the same time, then surface coating is carried out, the density of the synthesized positive electrode material is improved, the structural stability of the synthesized positive electrode material is enhanced, and the morphology, the crystal face and the crystal boundary of the positive electrode material are optimized; the side reaction between the crystal interface of the positive electrode material and electrolyte is inhibited, the service life is prolonged, and the safety performance during use is enhanced. A small amount of water vapor and carbon dioxide gas generated in the preparation process are discharged at high altitude, so that the environment is not polluted.

The invention provides a lithium manganese iron phosphate material and a preparation method and application thereof, and belongs to the technical field of lithium batteries, the lithium manganese iron phosphate material comprises a gradient manganese-doped core, a magnesium-doped layer, a carbon coating layer and an Al2O3 coating layer; the gradient manganese-doped inner core sequentially comprises a manganese-containing core layer, a manganese-containing transition layer and a manganese-containing shell from inside to outside, and the manganese ion concentration of the manganese-containing core layer is from high to low. According to the lithium manganese iron phosphate material disclosed by the invention, the gradient manganese-doped core is designed, so that the concentration gradient distribution of manganese ions is realized, and the electrochemical performance of the material is optimized. Meanwhile, due to the introduction of the magnesium doping layer, the cycling stability and the thermal stability of the material are further improved, and the manganese ion dissolution phenomenon in a high-temperature environment is reduced; in addition, the use of the carbon coating layer significantly improves the conductivity of the material and improves the charge and discharge performance of the material, and the Al2O3 coating layer can improve the structural stability of the material and reduce the dissolution of manganese ions, and also can improve the cycling stability and thermal stability of the material.

The invention relates to the technical field of metallurgy, in particular to a high-aluminum coal gangue desiliconization method which comprises the following steps: crushing and grinding high-aluminum coal gangue to obtain pretreated high-aluminum coal gangue; roasting and cooling the pretreated high-aluminum coal gangue to obtain activated coal gangue; mixing a sodium hydroxide solution with the activated coal gangue for reaction to obtain desiliconized slurry; filtering the desiliconized slurry, wherein a liquid phase is a sodium silicate solution; and washing the solid phase with water, and drying to obtain the desiliconized fly ash. The coal gangue selected by the invention is high-aluminum coal gangue, the aluminum content of the raw ore is 35-38%, the aluminum-silicon ratio of the raw ore is 0.8-0.9, the aluminum-silicon ratio after roasting activation reaches 0.85-0.95, and the aluminum-silicon ratio after one-step desiliconization can reach 5-8. Compared with the existing desiliconization technology, the technology not only can greatly improve the aluminum-silicon specific speed, but also can replace bauxite to be used as a raw material for preparing aluminum oxide by a Bayer process, so that the production cost is greatly reduced, and the utilization rate of resources is improved.

The invention provides a preparation method of sphere-like nano boehmite and sphere-like nano aluminum oxide, and belongs to the field of fine aluminum oxide. The method comprises the following steps: carrying out acid pickling pretreatment on industrial alumina powder to obtain a first pretreated raw material; carrying out hydration reaction on the rho-aluminum oxide to obtain second pretreatment slurry containing boehmite and Bayer stone; mixing the first pretreatment raw material, the second pretreatment slurry, a pH regulator and a crystal growth regulator to obtain mixed slurry; the mixed slurry is subjected to a hydrothermal reaction, and the sphere-like nanometer boehmite is obtained. Boehmite generated by low-temperature hydration of a raw material rho-aluminum oxide is used as a seed crystal to reduce the hydrothermal reaction temperature, and a pH regulator and a crystal growth guiding agent cooperate to promote the growth speed of each crystal face, promote the centripetal contraction force of liquid surface molecules and promote the boehmite generated by the hydrothermal reaction to be in a sphere-like shape. Therefore, the invention provides the preparation method of the sphere-like nano boehmite which is short in process and complete in crystallinity.

The preparation method of the low-sodium-oxide Bayer-process micro-powder aluminum hydroxide comprises the following steps: adding a seed crystal into a Bayer-process sodium aluminate solution to carry out a first-stage decomposition reaction so as to induce the generation and growth of an aluminum hydroxide crystal nucleus in the Bayer-process sodium aluminate solution; adding a sodium aluminate fine solution into the material subjected to the first-stage decomposition reaction for multiple times to perform a second-stage decomposition reaction so as to promote lattice reconstruction of the aluminum hydroxide crystal nucleus and removal of sodium ions in the sodium aluminate solution; carrying out solid-liquid separation on the material after the second-stage decomposition reaction to obtain a solid material; and washing and drying the solid material to obtain the micro-powder aluminum hydroxide. Through the synergistic effect of seed crystal induced crystallization, segmented decomposition reaction, temperature control, solid-liquid separation, washing and the like, the residual amount of sodium oxide is reduced from multiple links, and efficient preparation of the low-sodium-oxide micro-powder aluminum hydroxide is achieved.

An aluminum hydroxide low-temperature roasting system comprises a feeding system, a roasting system, a multi-stage separation system, a cyclone recycling system and the like, the feeding system is used for conveying Al (OH) 3 materials, the roasting system is used for roasting aluminum hydroxide materials and outputting alpha-Al2O3, the multi-stage separation system is used for cooling high-temperature alpha-Al2O3, and the cyclone recycling system is used for recycling the high-temperature alpha-Al2O3. And the cyclone recovery system is used for recovering flue gas generated by the roasting system. The interior of the suspension roasting furnace is divided into different areas through the stepped functional belt from bottom to top, Al2O3 particles with attached water removed pass through the different areas in sequence, temperature control is conducted on the areas through different combustion chambers, therefore, dynamic balance of materials is achieved in the roasting process, the roasting temperature is reduced, and the roasting efficiency is improved. Compared with the traditional roasting temperature, the highest roasting temperature does not exceed 900 DEG C, and the roasting energy consumption is lower at the low temperature. Secondly, the alpha-Al2O3 stays for 1-10 min through a buffer, the ignition loss rate of the alpha-Al2O3 is reduced in the process, and meanwhile energy consumption in the roasting process is reduced.

The present invention relates to the technical field of the preparation of Cr3+-doped fluorescent materials. Disclosed are the preparation of a Cr3+-doped fluorescent material and the use thereof in a plant light supplement lamp. The preparation comprises the following steps: weighing a matrix raw material and a Cr3+-containing raw material according to the stoichiometric ratio, and respectively grinding and then storing same in a dryer; placing the raw materials into a ball milling tank, and subjecting same to planetary ball milling for 3-6 hours; transferring same to an alumina crucible, and pre-sintering same for 2-5 hours; after secondary ball milling, adding a fluxing agent thereto; placing same in a high-temperature furnace and sintering same for 6-10 hours, and furnace cooling same or cooling same under the protection of an inert gas; and firstly coarsely crushing same, then grinding same to 10-30 μm, alternately cleaning same with deionized water and ethanol, drying same in an air dry oven, detecting and screening the product by using a fluorescence spectrophotometer, an X-ray diffractometer and a scanning electron microscope, and remanufacturing unqualified products after adjusting process parameters according to detection results. The present invention has a high light-emitting efficiency, and the spectrum thereof is suitable for plant photosynthetic absorption. When being applied to a light-supplementing lamp, plant growth can be promoted, the plant height and the chlorophyll content are significantly increased, and the natural spectrum is simulated, such that the material is suitable for multiple cultivation scenarios.

The invention discloses a vacancy isolation preparation method of monodisperse nano alpha alumina, and relates to the technical field of new materials, alpha alumina can be obtained through heat treatment of various activated alumina, but the alpha alumina can be obtained while alumina of other crystal forms is converted into alpha alumina. Generally accompanied by the process of combining and growing other crystal forms of nano-crystalline grains into wormlike alpha-type aluminum oxide crystalline grains, the nano-alpha-type aluminum oxide of less than 100 nanometers is difficult to obtain in a phase inversion manner. According to the preparation method, rho aluminum oxide which can be hydrated to obtain nano-particles is used as a raw material, through adsorption and desorption of lithium chloride, a hydration product is subjected to volume expansion, vacancies left after desorption of lithium ions change a conversion path of phase conversion to alpha aluminum oxide, and combination and growth (hard agglomeration) of crystal grains are prevented; therefore, the monodisperse nano alpha-type aluminum oxide can be efficiently prepared on a large scale.

A method for manufacturing a fused metal sight window that melts the metal of the frame around the window, instead of the traditional method of melting the window into the frame. Since most of the superior optical transparent materials (such as fused silica, sapphire, YAG, ALON, diamond, fused quartz and magnesium fluoride) have a melting point higher than most metals, it was not previously possible to create fused metal sight windows with these materials. By melting the frame onto the window, many new combinations of metals and optical materials may be used while retaining the strength of the sight window that results from fusing the metal and the window.

The invention relates to the technical field of aluminum oxide clean production, in particular to a method for treating gibbsite through high-temperature calcification transformation based on source blocking, which comprises the following steps: mixing high-iron bauxite, a calcium compound and Bayer mother liquor, and then carrying out pulpifying to obtain ore pulp; conveying the ore pulp to a high-pressure dissolution reactor to obtain transformed red mud; separating and washing the transformed red mud by using a vortex rapid settling tank; and adding a binder into the washed and dried transformed red mud to prepare small balls, and roasting, hardening and solidifying to obtain ironmaking pellets. According to the method, Bayer process flow equipment can be directly adopted, the method has the characteristics of simple process and equipment, high production efficiency and the like, the transformed slag serves as a pellet raw material to be directly used for producing pellets, no solid waste is generated in the whole process, and finally harmless, high-valued and full-quantized consumption of the red mud is achieved; and the worldwide problem that a large amount of red mud is discharged in the aluminum oxide production process is thoroughly solved.

The invention provides composite coated high-stability lithium-rich lithium ferrite and a preparation method thereof, and belongs to the field of lithium ion battery positive electrode lithium supplements.The preparation method of the composite coated high-stability lithium-rich lithium ferrite comprises the steps that an iron source and a lithium source are mixed, and a first mixture is obtained; performing first calcining treatment on the first mixture to obtain a calcined product; mixing and dispersing the calcined product and a metal compound to obtain a second mixture; carrying out second calcining treatment on the second mixture to obtain composite coated high-stability lithium-rich lithium ferrite; wherein the ratio of the amount of substance of the lithium element in the lithium source to the amount of substance of the iron element in the iron source is greater than 5. According to the method, excessive lithium sources are introduced, so that a large amount of residual lithium on the surface of Li5FeO4 forms a residual alkali layer, the residual alkali layer is converted into a compact and complete metal lithium oxide coating layer under the action of the metal compound and the second calcination treatment, and the air stability of Li5FeO4 is effectively improved.