34 results about "Sesquioxide" patented technology

The application is a beneficiation method for removing iron and aluminum sesquioxide from high-grade collophanite, and belongs to the technical field of mineral processing. The material obtained by crushing, superfine grinding and grading of raw ore is fed into a heavy separation operation to obtain a heavy separation concentrate and a heavy separation tailing; the heavy separation concentrate is fed into a reverse flotation magnesium removal operation buffer tank, and the heavy separation tailing is thickened, re-ground, classified, and then subjected to positive flotation desliming and positive flotation desilication, and the obtained concentrate is fed into the reverse flotation magnesium removal operation; three backwater pools are built to store positive flotation desilication backwater, reverse flotation magnesium removal backwater and heavy separation operation backwater respectively. The method mainly aims at high-grade high-sesquioxide calcareous collophanite, adopts heavy and float combined separation, divides the raw ore into a heavy separation concentrate and a heavy separation tailing through a heavy separation device, and subjects the heavy separation tailing to positive and reverse flotation to obtain a heavy tailing flotation concentrate. The separation process fully utilizes the advantages of positive and reverse flotation and heavy separation, the process flow is stable, the separation effect is good, high-quality phosphorus concentrate is realized, and low-quality phosphorus concentrate can be used.

A preparation method of an iridium oxide catalyst belongs to the field of hydrogen production by water electrolysis. The preparation method includes: a first reaction solution in which an initial catalyst is dispersed, the initial catalyst containing iridium dioxide; a second reaction solution in which a reducing agent is dissolved; injecting the first reaction solution and the second reaction solution into a microchannel continuous flow reactor for continuous reduction reaction so that part of the iridium dioxide is reduced to iridium sesquioxide. The iridium oxide catalyst prepared by this preparation method has both better activity and better stability.

The application discloses a kind of co-doped Eu 3+ 、Sm 3+ Half of oxide-based red light scintillation crystal material and its preparation method and application, belong to artificial crystal growth technical field.Its chemical formula is (Sm x Eu y R 1‑x‑y )2O3, 0.01≤x≤0.08, 0.01≤y≤0.06, R is selected from any one of Lu, Sc, Y.R is Lu, the performance of crystal is more excellent, and it is more advantageous in the high-energy ray detection of extreme environment.R is Lu, and the crystal is transparent, and the appearance is good, has microsecond level decay time and high light yield, has excellent scintillation performance and extreme environment performance;It can be effectively combined with photoelectric detection equipment, can be used in extreme temperature, strong radiation nuclear radiation detection service environment, widen the application range of scintillation material, make up the application blank of traditional scintillation material in extreme service environment, meet the needs of nuclear detection and other scientific and technological development.

The invention relates to a rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of an aero-engine and a preparation method thereof, the thermistor takes holmium oxide, erbium trioxide, thulium trioxide, ytterbium trioxide, lutetium trioxide and tantalum pentoxide as raw materials, the chemical composition is RETaO4, Ln = Ho, Er, Tm, Yb, Rm = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17 The material constant B value range is 10565-15673 K, the resistivity is 2.20 * 10 < 5 >-1.295 * 10 < 6 > omega.cm at the temperature of 500 DEG C, the linear determination coefficient R2 of ln rho and 1000 / T is greater than 99%, the resistance drift rate is between 3.01% and 60%, and the absolute value of the resistance drift rate of (HoErTmYbLu) 1 / 5TaO4 after aging for 50 hours at the temperature of 1500 DEG C is less than 3.01%. The high-temperature thermistor prepared by the preparation method is stable in resistance performance and good in consistency, has an excellent negative temperature coefficient thermosensitive characteristic in a wide temperature range of 400-1500 DEG C, and is suitable for manufacturing a high-performance high-temperature thermistor suitable for temperature measurement and control of an aero-engine.

The invention relates to a preparation method of a laser-infrared-radar compatible multispectral inhibition ceramic material, which comprises the following steps: by taking iron oxide, manganese oxide, magnesium oxide, copper oxide, nickel oxide and cobalt sesquioxide as raw materials, carrying out ball milling, mixing and drying, granulating, pressing into a green body sheet, and calcining to obtain a high-entropy ceramic substrate; depositing a low-refractive-index material L, a defect layer material S and a high-refractive-index material H on the high-entropy ceramic substrate according to a film layer structure as a substrate (LH) (LH) S (LH) Air or a substrate (LH) S (LH) (LH) (LH) Air by adopting a sputtering process; the prepared material has the multispectral protection characteristic compatible with laser / infrared / radar, and in the aspect of laser protection, the reflectivity can reach 2.19%, 1.78% and 2.9% at the characteristic laser points of 1.06 m, 1.54 m and 10.6 m; in the aspect of infrared protection, the reflectivity at the infrared absorption frequency bands of 3-5 m and 8-14 m can reach 97%; in the aspect of radar protection, under the ultra-thin 2.2 mm thickness, the effective absorption bandwidth of 3.2 GHz and the minimum reflection loss of-67.4 dB are achieved. The materials selected by the system are all high-temperature-resistant materials and can adapt to a high-temperature service environment.

The application relates to the technical field of anti-radiation glass, and discloses anti-radiation glass for low-orbit spacecrafts, a preparation method and application thereof. The anti-radiation glass for low-orbit spacecrafts comprises the following raw materials in parts by mass: quartz sand 45.5-68 parts, aluminum hydroxide 8.41-10.25 parts, boric acid 8.86-24.62 parts, carbonate 24-43.69 parts, cerium dioxide 0.6-2.1 parts, gallium sesquioxide 0.2-1.2 parts, antimony sesquioxide 0.5-1 part, nitrate 2-4.6 parts, molybdenum dioxide 0.5-1.4 parts, lead oxide 0.8-2.2 parts, tetrabutyl titanate 3.4-12.75 parts, and kerosene 0.2-0.8 part. Through the technical scheme, the problem of insufficient anti-radiation performance of the glass for low-orbit spacecrafts in the related art is solved.

The invention discloses a defect-assisted dual-carbon coupled ferric oxide Fenton-like catalyst as well as a preparation method and application thereof in pollutant degradation, and belongs to the technical field of environmental governance materials. According to the method, the precursor of the iron-based material is calcined in the air, so that the organic matter forms double carbons in one step, and through a carbon-iron interface formed by in-situ binding, after amorphous carbon adsorbs a substrate, the surface electronic state of ferric oxide can be regulated and controlled through the interface charge effect, and the adsorption energy and activation efficiency of the ferric oxide to the substrate are optimized; and the graphite-like carbon has the electron transmission capability, so that electrons generated in the catalytic reaction can be timely exported, the continuous adsorption power of the amorphous carbon to the substrate is further enhanced, closed-loop synergy of adsorption-catalysis-electron transmission is formed, and finally, the adsorption performance and the catalytic performance of the material are improved. The method is simple and convenient in step operation, wide and cheap in raw material source and suitable for industrial large-scale production, and has a wide application prospect in the field of environmental governance.

The invention discloses a method for coating a sodium electrode layered oxide positive electrode material by using a nickel-manganese-titanium-copper mixture, which is characterized in that a certain amount of nickel is added on the basis of a manganese dioxide or manganese sesquioxide coating material, so that when a P2 phase is formed by in-situ coating of the sodium electrode layered oxide positive electrode material, the nickel-manganese-titanium-copper mixture is added into the nickel-manganese-titanium-copper mixture; the charge-discharge capacity of the P2 phase and the conductivity of sodium ions in the coating layer are effectively increased, and a certain amount of titanium and elements such as magnesium, calcium, copper and zinc with large ion radiuses are added, so that the structural stability of the P2 phase is increased. The raw materials of the elements are prepared according to the molar ratio and then fully mixed to be used for coating the sodium electrode layered oxide positive electrode material, and after sintering is conducted at a certain temperature and for a certain time, in-situ reaction can be conducted on the surface of the sodium electrode layered oxide and surface residual sodium to generate a P2-phase nanometer coating layer with the structure more stable than that of a base body.

The application discloses a method and system for preparing manganese monoxide by adopting pyrolusite, through pretreatment of pyrolusite such as pyrolysis, hydrothermal reaction and oxidation reaction, low-cost and high-efficiency conversion of manganese tetroxide and manganese sesquioxide contained in the pyrolusite into manganese dioxide is realized, the product quality of the manganese monoxide prepared through subsequent fluidization reduction is improved, and a foundation is laid for subsequent high-efficiency leaching of manganese. The released carbon dioxide in the fluidization reduction process of the pyrolusite is recycled to prepare the recyclable CO for reduction, the carbon resources are maximally utilized, and the carbon emission is greatly reduced. The method has the characteristics of simple process flow, excellent operation condition, low fossil energy consumption, small environmental pollution, good economic benefit and environmental benefit and the like, and is expected to open up a more stable and efficient way for development and utilization of the pyrolusite.

The invention relates to the field of electronic materials, and particularly discloses a low-gradient zinc oxide varistor and a preparation method thereof. The invention relates to a low-gradient zinc oxide piezoresistor disc, which is prepared from the following raw materials in parts by weight: 88 to 96 parts of zinc oxide, 1.5 to 3 parts of antimony trioxide, 2 to 5 parts of bismuth trioxide, 0.2 to 1.8 parts of nickel oxide, 0.1 to 0.9 part of cobalt sesquioxide, 0.1 to 0.4 part of manganese oxide, 0.02 to 0.07 part of chromium sesquioxide, 0.15 to 0.18 part of lithium acetate, 1.2 to 1.8 parts of dispersing agents, 1.8 to 2.5 parts of binding agents, 0.12 to 0.15 part of aluminum nitrate and 0.001 to 0.003 part of silver nitrate. Under the synergistic effect of all the components, by adjusting the use ratio of all the components, the potential gradient of the resistor disc can be reduced, the large-current endurance capacity of the resistor disc is improved, and the change of electrical performance after impact is reduced.

The invention belongs to the technical field of silicon carbide powder, and particularly relates to silicon carbide powder and a synthesis device thereof.The silicon carbide powder comprises raw materials and a composite fluxing agent, and the raw materials comprise, by weight, 100-110 parts of 99.999% metal silicon powder, 33-35 parts of 99.99% graphene powder and 0.01-0.05 part of 99.999% gallium sesquioxide; the composite fluxing agent is prepared from 5 to 8 parts of L iF-NaF mixed salt and 4 to 7 parts of CaF2-KF mixed salt. According to the invention, 99.999% of metal silicon powder, 99.99% of graphene powder and 99.999% of gallium sesquioxide are used as raw materials, and the LiF-NaF mixed salt and the CaF2-KF mixed salt are used as composite fluxing agents, so that the purity of the final powder is greater than or equal to 99.999%, the total content of impurities is less than or equal to 0.01%, the requirements of high-end semiconductor devices are met, an additional purification process is not needed, and the production cost is greatly reduced.

The application relates to a high-temperature negative temperature coefficient thermosensitive ceramic material and a preparation method thereof. 1‑ x Nb x O3 is prepared by a solid phase reaction method. The following raw materials are weighed according to percentage by weight: lanthanum sesquioxide 73.315-76.112%, aluminum sesquioxide 20.701-23.888%, and niobium pentoxide 1.540-5.985%; the preparation method comprises the following steps: S1. weighing; S2. mixing; S3. grinding; S4. pre-sintering; S5. secondary grinding; S6. tabletting; S7. cold isostatic pressing; S8. sintering; S9. platinum slurry coating; and S10. annealing. The high-temperature negative temperature coefficient thermosensitive ceramic material has a wide temperature range (600-1400 DEG C) and excellent aging stability; after aging for 400-600 hours at a high temperature of 1000 DEG C, the resistance drift rate of the LaAl 1‑x Nb x O3 sample is 0.906-3.352%, and the service life is long; in addition, the powder particles prepared by the application have high dispersity and are not prone to agglomeration, and the material strength is high.

The present application relates to a kind of low-grade silicon calcareous collophanite gangue mineral synchronous removal inhibitor and application, the inhibitor includes methylene bis naphthalene sulfonic acid sodium 40~70 parts, polysaccharide polymer 15~30 parts and organic acid 15~30 parts by mass fraction.The inhibitor provided in the present application contains active groups such as sulfonic acid group, hydroxyl group and carboxyl group in raw material, can occur strong adsorption with dolomite, iron-aluminum sesquioxide and activated quartz and other gangue minerals in silicon calcareous collophanite, mask the active site of gangue mineral surface, inhibit the adsorption of collector on the surface of gangue mineral, and by the reasonable proportioning between raw materials, can significantly improve the grade and recovery rate of phosphate concentrate, effectively reduce the content of harmful impurities therein.

The invention relates to the technical field of water pollution control, in particular to a manganese-based composite material and a preparation method and application thereof. The manganese-based composite material comprises a manganese sesquioxide base material and acid radical ions bonded on the surface of the manganese sesquioxide base material. The invention also provides a preparation method of the manganese-based composite material, which comprises the following steps: dissolving an inorganic manganese salt in an inorganic solvent to obtain a solution A; dissolving oxalate in an inorganic solvent to obtain a solution B; adding the solution A into the solution B, carrying out stirring reaction, and carrying out solid-liquid separation to obtain a manganese oxalate precursor; and calcining the manganese oxalate precursor to obtain porous manganese sesquioxide, immersing the porous manganese sesquioxide into an ammonium salt solution, stirring at normal temperature, standing to obtain manganese sesquioxide impregnated with ammonium salt, and calcining to obtain the manganese-based composite material. The invention also provides an application of the manganese-based composite material prepared by the preparation method as a catalyst. The problem that the oxidative degradation capacity of periodate on organic pollutants is limited when periodate is directly used as an oxidizing agent is solved.

The invention discloses a method for producing manganous-manganic oxide from pyrolusite waste residues. The method comprises the following steps: (1) crushing, sieving and drying the pyrolusite waste residues; (2) mixing the dried pyrolusite waste residues with the flux in the claim 1, performing gradient roasting in a tubular furnace, then naturally cooling the roasted residues to room temperature, taking out the roasted residues, adding deionized water, performing water leaching at room temperature, and performing filtering separation to obtain a leached crude manganese sulfate leaching solution; (3) various impurity removal reagents are added into the crude manganese sulfate leachate for purification, and (4) ammonium bicarbonate is added into the fourth-time manganese sulfate purification liquid to obtain manganese carbonate precipitates, the manganese carbonate precipitates are washed with deionized water and calcined to obtain manganous-manganic oxide, and the manganous-manganic oxide is smashed, sanded, washed and dried to obtain the high-purity manganous-manganic oxide. The recovery rate of manganese reaches 99.4% or above, the method can be used for preparing high-purity manganous-manganic oxide, the energy consumption and reagent cost are lower, and meanwhile the problems of resource waste and environmental pollution caused by pyrolusite waste are solved.

The invention discloses a method for identifying a crystal boundary of a sesquioxide crystal, and belongs to the technical field of crystal detection. According to the invention, a frosted surface with specific roughness (Sa = 0.7-2 [mu] m) is formed by controlling diamond wire cutting or mechanical grinding, so that the grain boundary presents a macroscopic subarea boundary under a bright light source due to light scattering difference. According to the method, rapid identification of the crystal boundary of the sesquioxide crystal is achieved through combination of physical machining and optical observation, chemical corrosion is not needed, operation is easy, the equipment requirement is low, cost is remarkably saved, and dependence on a large precise instrument or a synchrotron radiation light source is eliminated; the detection efficiency is high, detection can be rapidly implemented on the surface of a large-size crystal with naked eyes, and in-situ and real-time observation of a crystal boundary is realized; images are clear and visual, and a reliable basis is provided for directional cutting of a high-quality single crystal area; the method is suitable for various sesquioxide crystals including lutetium oxide, and has high method universality.

The present disclosure provides a method for preparing carbon monoxide by using sodium carbonate and manganese oxide thermochemical cycle, comprising: S1, mixing sodium carbonate and manganese sesquioxide, heating to make manganese sesquioxide undergo endothermic decomposition reaction to obtain manganese trioxide and oxygen; S2, heating to make manganese trioxide react with sodium carbonate to obtain NaMnO2, carbon dioxide and carbon monoxide; S3, introducing carbon dioxide to react with NaMnO2 to obtain manganese sesquioxide and sodium carbonate, which are recycled in S1 and S2. The present disclosure uses a multi-step method to prepare carbon monoxide fuel by decomposing carbon dioxide through thermochemical cycle, which can provide stable and sufficient carbon monoxide at a lower temperature, and provides a method for preparing carbon monoxide fuel through thermochemical cycle, which is simple in process, high in efficiency, zero in carbon emission, stable in operation and suitable for various operating environments.

The application discloses a method for producing battery-grade trimanganese tetraoxide by using electrolytic manganese anode slime, and production is carried out according to the following method: (1) electrolytic manganese anode slime is broken and then dried; (2) the electrolytic manganese anode slime is mixed with a flux, and is roasted in a tubular furnace until the reaction is complete; the manganese sulfate is leached out by deionized water at room temperature, and is filtered to obtain leached manganese sulfate crude liquid and leaching residue; (3) a purifying reagent is added to the manganese sulfate crude liquid for purification; (4) ammonium bicarbonate is added to convert the manganese sulfate into manganese carbonate; the manganese carbonate is filtered to obtain manganese carbonate precipitate and ammonium sulfate solution; the manganese carbonate precipitate is calcined to obtain trimanganese tetraoxide; and the trimanganese tetraoxide is crushed, sand-ground, washed and dried to obtain battery-grade trimanganese tetraoxide. The manganese recovery rate can reach more than 99.3%, the energy consumption and cost are lower, and the problems of resource waste and environmental pollution caused by the manganese anode slime of electrolytic manganese manufacturers are solved.

The application discloses a production process of high-performance permanent ferrite, and belongs to the technical field of permanent ferrite preparation. The raw materials are prepared according to weight parts, wherein the iron oxide is 80-88 parts, the strontium carbonate is 0.5-5 parts, the calcium carbonate is 3-10 parts, the lanthanum oxide is 4-10 parts, and the cobalt sesquioxide is 1-3 parts. After mixing, pre-sintering, primary grinding, secondary ball milling, magnetic field forming and sintering, the sintered body is obtained. In the sintering process, the temperature rising rate in the temperature interval of 900 DEG C-1200 DEG C is strictly controlled to be 1.5-3 DEG C / min, the uniform diffusion reaction of the doped elements in the green body is ensured, the temperature rising rate and the holding time are simultaneously adjusted according to the adding proportion of different elements in the high-performance permanent ferrite, the uniformity of the grain size of the ferrite is improved, the squareness is improved, and the demagnetization resistance of the high-performance permanent ferrite is improved.

This invention discloses a collector for reducing sesquioxide content in phosphate rock, its preparation method, and its application. The invention involves mixing an interfacial activity enhancer, ammonium dodecyl sulfate, and sorbitan monooleate polyoxyethylene ether, stirring the mixture, ultrasonically treating it, and then stirring it in an aqueous solution of etheramine salt to obtain a collector for reducing sesquioxide content in phosphate rock. This collector exhibits high selectivity for phosphate rock separation and significantly improves the problems of poor foam flowability and difficulty in breaking up froth in reverse flotation products. Furthermore, the application of this collector for reducing sesquioxide content in phosphate rock allows for control over the particle size of the grinding product, reducing the impact of fine particles generated by over-grinding on the collector. This significantly improves the recovery rate of phosphate rock and the grade of phosphate concentrate while achieving deep impurity removal.

The invention relates to a rare earth lanthanum doped manganese-based composite oxide catalyst as well as a preparation method and application thereof, and belongs to the field of new materials and atmosphere prevention and control. The catalyst is formed by compounding lanthanum-doped manganese sesquioxide and pentamanganese octaoxide, and has high-content oxygen vacancy, manganese-rich defect site and heterogeneous interface structure and strong oxidation-reduction performance. The preparation process is simple and convenient, the condition is mild, the cost is low, the method is suitable for large-scale production, the prepared rare earth doped manganese-based composite oxide can provide more active oxygen vacancies, and the efficient and stable ozone decomposition catalytic effect of the composite oxide in the high space velocity and humidity environment is guaranteed.

The invention belongs to the technical field of PEM electrolyzed water, and particularly relates to a manganese-doped cathode hydrogen evolution catalyst and a preparation method and application thereof. The cathode hydrogen evolution catalyst takes manganese oxide and catalyst carrier carbon black as carriers to load platinum, the mass ratio of the platinum to the manganese oxide to the carbon black is 1: (10-50): (15-150), the mass fraction of the platinum is 0.5%-4%, and the manganese oxide is one or more of manganese monoxide, manganese dioxide, manganese sesquioxide or manganous-manganic oxide. By introducing manganese, more active sites of platinum can be increased, so that the inherent activity of Pt sites is effectively improved, and the membrane electrode performance of the manganese-doped cathode hydrogen evolution catalyst prepared by the method is obviously improved.

The invention discloses a grading process for synchronously removing silicon, magnesium and sesquioxide impurities from phosphorite, and belongs to the technical field of mineral processing, after the phosphorite is ground, under the condition of alkalescence ore pulp (pH 8-9), sodium carbonate is added as a pH regulator, a combined inhibitor, a collecting agent N-dodecyl amino malonate and an auxiliary agent, and then the phosphorite is subjected to separation and purification to obtain the silicon-magnesium-sesquioxide impurity-removed phosphorite. The direct flotation process of roughing, refining and sweeping is adopted, and efficient separation of apatite and impurities such as dolomite, calcite, quartz and sesquioxide is achieved. The process is simple, the reagent cost is low, equipment corrosion can be remarkably relieved, high-quality phosphate concentrate with the P2O5 grade larger than or equal to 30%, MgO smaller than or equal to 1.0% and R2O3 smaller than or equal to 2.0% is obtained, the P2O5 recovery rate is high, meanwhile, tail water is easy to treat and reuse, and the novel collophanite beneficiation technology is efficient, economical and environmentally friendly.

The invention provides a recleaning method for improving silicon-calcium collophanite flotation tailings, and belongs to the technical field of phosphorite beneficiation. The method comprises the following steps: firstly, adjusting the concentration and temperature of collophanite flotation tailing pulp, then sequentially adding a pH regulator and a medium regulator, and then adding a phosphorite flotation collector for pre-flotation to obtain pre-selected tailings and pre-selected concentrate; the preselected concentrate is subjected to grading treatment to obtain overflow and settled sand, preselected tailings and graded overflow are combined, a phosphorite flotation collecting agent is added again for re-separation, finally, phosphate concentrate is obtained, the P2O5 grade of the phosphate concentrate reaches 18%-32%, the phosphorus resource recovery rate is remarkably increased, and the problems that medium-low-grade phosphate tailings are difficult to recover, and the sesquioxide content is high are effectively solved. And meanwhile, the method saves water, the wastewater can be completely recycled, the treatment cost is low, and the method has important economic benefits and environmental protection values.

The invention discloses a coal combustion catalyst as well as a preparation method and application thereof. The coal combustion catalyst comprises a carrier, an active agent, a desulfurizing agent and an auxiliary agent in percentage by weight, the carrier is prepared from 60%-70% of TiO2 and an anatase phase gt; 90%; the specific surface area is 80-120m / g; the average particle size D50 is 5-15 [mu] m; the pore volume is gt; 0.2 cm / g; the active agent is a mixture of 12%-20% of Fe2O3 and CuO, the desulfurizing agent adopts CaO with calcium acetate as a precursor and accounts for 8%-12%, and the auxiliary agent is a mixture of MnO2 and WO3 with the content smaller than or equal to 5%. Compared with pure coal combustion, the coal combustion stability can be enhanced by adding the catalyst under the action of promoting free radical chain reaction by manganese sesquioxide and copper oxide, and the temperature fluctuation of a hearth is reduced by 15-20% under the working condition of low load or inferior coal, so that the fire extinguishing risk is avoided; meanwhile, through catalytic oxidation of the catalyst, carbon monoxide can be further oxidized into carbon dioxide, so that the emission concentration of carbon monoxide is greatly reduced.

The invention relates to a beneficiation method for high-power semi-oxide silicon-calcium collophanite, and belongs to the field of mineral processing. The method comprises the following steps: crushing raw ore, carrying out ultrafine crushing and screening, carrying out ore grinding and grading, and carrying out reselection to obtain reselected concentrate and reselected tailings; carrying out reverse flotation dealumination and magnesium removal on the gravity concentrate, and dehydrating to obtain gravity concentrate flotation concentrate; and re-concentration and ore grinding operation is carried out on the re-concentration flotation tailings, dewatering is carried out, re-concentration flotation tailings filter cakes are mixed with underflow of a re-concentration tailings thickener, then grinding and grading are carried out, reverse flotation magnesium removal operation is carried out, and reverse flotation concentrate is obtained. According to the method, the energy consumption of the whole grinding process is effectively reduced, a good separation environment is provided for subsequent flotation, raw ore is divided into high-magnesium and high-silicon phosphorite and low-magnesium and low-silicon phosphorite through reselection and preselection, the low-magnesium and low-silicon phosphorite is subjected to a single reverse flotation synchronous magnesium, aluminum and iron removal process, and the low-magnesium and low-silicon phosphorite is obtained. A single reverse flotation magnesium removal process is adopted for the high-magnesium and high-silicon phosphorite, high-quality and high-utilization and low-quality and low-utilization of the phosphorite are achieved, the beneficiation technological process is stable, the separation effect is good, and the recovery rate is high.

The application discloses a kind of double built-in electric field ternary heterojunction photocatalyst and preparation method thereof.The catalyst is composed of bismuth vanadate, manganese sesquioxide and nickel carbide;The mass ratio of bismuth vanadate, manganese sesquioxide and nickel carbide is 10-5:2-1:1;Bismuth vanadate, manganese sesquioxide and nickel carbide in the photocatalyst form Z-type heterojunction structure.The catalyst is prepared by hydrothermal method and electrostatic self-assembly method, by strictly controlling the proportion of each component and reaction parameter, realize the Z-type heterojunction structure of bismuth vanadate, manganese sesquioxide and nickel carbide, greatly improve the visible light absorption and the performance of carrier recombination inhibition of catalyst.The catalyst based on the synergistic effect of double built-in electric field, Z-type inhibition junction structure and catalyst magnetism, so that the catalyst has excellent photocatalytic activity, by testing, using the catalyst to degrade BP-3, 30min within degradation rate is 60%, 60min degradation rate is 90%.

The application discloses multi-element high-entropy perovskite oxynitride nanopowder and a preparation method and application thereof, and relates to the technical field of photocatalysis, and in particular to a preparation method of multi-element high-entropy perovskite oxynitride nanopowder.The preparation method comprises the following steps: dissolving calcium carbonate powder, strontium carbonate powder, barium carbonate powder, europium sesquioxide powder, tantalum pentoxide powder and first urea in anhydrous ethanol, performing ball milling to obtain mixed slurry, drying the mixed slurry to obtain mixed precursor powder, heating the mixed precursor powder to 1100 DEG C to 1400 DEG C in a protective atmosphere to perform calcination, cooling to room temperature, and performing ammoniation on the obtained multi-element high-entropy perovskite oxynitride nanopowder initial powder in the protective atmosphere by using second urea to obtain multi-element high-entropy perovskite oxynitride nanopowder CaSrBaEuTa(O,N)3.The preparation method has the advantages of low cost, short time consumption, high product purity and the like, and the prepared product can be applied to the field of photocatalytic water oxygen production and has a very high oxygen production rate.

The application discloses a method for preparing a ceramic protective layer on a metal or alloy material surface, a composite material and application thereof, relates to the technical field of ceramic protective layers, and comprises the following steps: S1, coating ceramic slurry on the surface of the metal or alloy material, and performing warm isostatic pressing treatment after drying to obtain a protective layer green body; and S2, sequentially performing decarburization, pre-sintering and hot isostatic pressing sintering on the protective layer green body prepared in the step S1 to obtain a ceramic protective layer. The application additionally adds manganese sesquioxide in the ceramic slurry, and the addition of the manganese sesquioxide is beneficial to forming continuous closed pores in the protective layer green body in the low-temperature pre-sintering process, so that the protective layer sintering is not caused to be not dense due to the through holes in the subsequent hot isostatic pressing sintering process; and the pre-sintering and geometric hot isostatic pressing sintering mode is adopted to reduce the influence of the open pores in the protective layer, so that the density of the finally obtained ceramic protective layer is improved.