49 results about "Sesquioxide" patented technology

The invention discloses a beneficiation method of high-quality phosphoric ore pulp for producing hemihydrate-dihydrate phosphoric acid, and relates to the technical field of phosphorite beneficiation. The method comprises the following steps: primarily crushing medium-low-grade collophanite, grinding and grading to obtain flotation pulp; after sulfuric acid and a reverse flotation collecting agent are added into flotation pulp for pulp mixing and mineralization, the flotation pulp is pumped into a roughing flotation column for roughing, and roughing concentrate is obtained; the roughing concentrate is subjected to size mixing and pumped into a cyclone set to be subjected to cyclone classification, and sand setting ore pulp with sesquioxide reduced is obtained; carrying out size mixing on the sand setting ore pulp, and pumping the ore pulp into a fine flotation column to obtain fine phosphoric ore pulp; concentrating the concentrated ore pulp through a thickener, pressurizing and filtering, and supplying the concentrated ore pulp to a semi-hydrated-dihydrated phosphoric acid device for use. A flotation column is adopted for roughing, part of sesquioxide in the phosphoric ore pulp is removed through low-pressure rotational flow grading, deep magnesium removal is conducted through a fine selection technology, magnesium oxide in the ore pulp is further reduced, and the phosphoric ore pulp meeting the production requirement of the semi-hydrate-dihydrate phosphoric acid technology is obtained through concentration and filter pressing dehydration of a thickener.

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.

The invention discloses a grain refinement method for manufacturing pure aluminum through laser powder bed melting additive, which comprises the following steps: uniformly mixing pure aluminum powder and titanium sesquioxide powder according to a mass ratio of (98-99.5): (0.5-2) to obtain mixed powder; and the mixed powder is put into laser powder bed melting additive manufacturing forming equipment, and forming is conducted on the mixed powder at the laser power of 200-400 W, the scanning speed of 200-2000 mm / s, the scanning distance of 0.08-0.12 mm and the interlayer thickness of 0.3 mm. According to the method, by mixing the titanium sesquioxide, the effects of grain refinement and bearing of more thermal stress of the pure aluminum in the printing process can be achieved, and in the rapid cooling process of printing, the titanium sesquioxide and the pure aluminum are molten and subjected to an oxidation-reduction reaction; titanium remains in an aluminum matrix in the form of solute atoms and hinders growth of crystal grains in the solidification process, so that the structure of pure aluminum is directly refined without other heterogeneous nucleation particles.

The invention discloses a preparation method of cobalt powder for fluorescence analysis of iron ore, and belongs to the technical field of analytical chemistry. The method comprises the following steps: weighing cobalt sesquioxide and anhydrous lithium tetraborate, uniformly mixing, transferring into a platinum yellow crucible, adding a proper amount of lithium bromide release agent, melting in a melting furnace according to a set mode, cooling, taking out, and grinding into powder; according to the method, the purchase cost of the cobalt powder can be effectively reduced, the process is simple, the production requirement can be met, and the technical support of a self-making method is provided for the cobalt powder for the iron ore fluorescence inspection method. When the cobalt powder prepared through the method is used for iron ore analysis, the analysis precision and accuracy can meet the requirements of similar standards, and the requirements of production and scientific research can be met.

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 present invention belongs to the technical field of preparation of electronic information functional materials, and discloses a rare earth oxide-based microwave dielectric ceramic with both chemical and temperature stability and a preparation method thereof. The chemical formula is (1-x)Sm2O3–xMgO; wherein, x is the mass fraction and 0.10 ≤ x ≤ 0.25; using samarium trioxide and magnesium oxide as raw materials, the samarium oxide-based microwave dielectric ceramic is obtained by the traditional solid-state sintering method, and no aging and decomposition phenomenon is seen when exposed to air, and the dielectric constant ε r is 20.0 to 16.2, the quality factor Q×f is 49,700 to 63,600 GHz, and the resonant frequency temperature coefficient τ f is +15.3 to -6.3 ppm / °C. By adding magnesium oxide, the present invention inhibits the aging and decomposition of the samarium oxide ceramic; by adjusting the addition amount of magnesium oxide, near-zero adjustment of the resonant frequency temperature coefficient τ f is achieved while ensuring a high quality factor Q×f value.

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 invention provides an infrared radiation coating for a funeral cremator, the infrared radiation coating comprises an infrared radiation agent, an infrared radiation improver, a binder and a coating additive, the infrared radiation improver comprises acetylene black and / or ferrotitanium powder, and the infrared radiation agent comprises silicon oxide, magnesium oxide, manganese sesquioxide, iron sesquioxide and copper oxide. The invention also provides a method and application of the infrared radiation coating. According to the infrared radiation coating provided by the invention, the infrared radiance of the coating can be improved, the stability of the infrared radiance of the coating can also be ensured, meanwhile, the use temperature can reach up to 1800 DEG C, and the temperature resistance characteristic of the high-performance infrared radiation coating is achieved; the cost is lower, and the economic value is higher.

The invention provides a dual-pore-forming iron-carbon composite filler for strengthening Feammox-NDFO autotrophic nitrogen removal and a preparation method thereof, and relates to the technical field of sewage organism autotrophic nitrogen removal, the dual-pore-forming iron-carbon composite filler comprises the following raw materials by weight: 30-45 parts of iron-containing powder, 15-30 parts of charcoal powder, 20-30 parts of an adhesive, and 10-15 parts of a pore-forming agent. The iron-containing powder is one or a combination of iron sesquioxide (Fe2O3), iron phosphate (FePO4), goethite (FeO (OH)) and ferric citrate; the pore-forming agent is sodium bicarbonate; the invention relates to a preparation method of a dual-pore-forming iron-carbon composite filler for strengthening Feammox-NDFO autotrophic nitrogen removal. The preparation method specifically comprises the following steps: 1, pretreating raw materials; 2, mixing and granulating; 3, steam curing and pore forming are carried out, wherein the curing temperature is 60-80 DEG C; the humidity is 80-90% RH; 4, ultrasonic-assisted deionized water soaking and pore forming are carried out, and the soaking temperature is 30-50 DEG C; the time is 6-12 hours; the ultrasonic frequency is 20-40 kHz. And 5, screening a finished product. The filler disclosed by the invention has the beneficial effects that the filler is mainly applied to a low-carbon sewage condition that C / N is less than or equal to 0.5, efficient denitrification can still be kept under the low-carbon condition, and the TN removal rate can reach 91.6-97.8%.

The invention discloses a metal honeycomb VOCs catalyst and a sulfur-resistant anti-scouring metal honeycomb VOCs catalyst in the field of preparation thereof, the sulfur-resistant anti-scouring metal honeycomb VOCs catalyst comprises a metal carrier, an aluminum oxide layer, a titanium oxide mixture and an active component, and the aluminum oxide layer, the titanium oxide mixture and the active component are all attached to the metal carrier; the metal carrier is a metal honeycomb carrier; the titanium oxide mixture comprises titanium monoxide, titanium dioxide and titanium sesquioxide, and the titanium monoxide, the titanium dioxide and the titanium sesquioxide are mixed to form a layered structure; the active component is a mixture composed of a reduced noble metal simple substance and a transition metal oxide. According to the invention, through alumina and titanium oxide materials, a multi-material layered structure is hooked on the metal carrier, so that the active component can obtain more stable attachment sites, and the purposes of enhancing the catalytic stability of the catalyst and maintaining the catalytic efficiency are achieved.

The invention discloses preparation and application of a size-controllable nickel particle loaded lanthanum trioxide catalyst, and belongs to the field of nano materials and chemical catalysis. The preparation method of the catalyst comprises the following steps: preparing nano nickel particles by a complex cracking method, preparing a catalyst carrier by an electrostatic spinning method, calcining at high temperature, dipping, drying and the like to obtain the target catalyst. The temperature of the complexing cracking method is 180-400 DEG C, the voltage of electrostatic spinning is 15-20 kV, the high-temperature calcination temperature is 500-800 DEG C, the dipping time is 12-36 hours, the drying temperature is 60-80 DEG C, the nickel content accounts for 5-30% of the weight of the catalyst, and the weight ratio of the catalyst carrier is 70-95%. The size range of nickel particles of the prepared catalyst is 2-20 nm, and the growth speed and size of the nickel particles can be controlled by adjusting conditions. The prepared catalyst shows excellent carbon dioxide hydrogenation performance and has an obvious size effect.

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 provides a method for preparing lithium manganate after EMD modification and impurity reduction, and belongs to the technical field of energy materials. Comprising the following steps: carrying out pretreatment to obtain EMD fine powder, sintering the EMD fine powder into manganese sesquioxide, cooling, washing and drying to obtain impurity-reduced manganese sesquioxide, and mixing and sintering the impurity-reduced manganese sesquioxide, a lithium salt and a metal oxide to obtain lithium manganate. After EMD electrolysis, residual electrolyte on the surface is washed away, then the powder is smashed into fine powder, and finally the content of sulfate radicals and various metal cations such as potassium, sodium, calcium and magnesium can be greatly reduced through calcination and rinsing. Manganese sesquioxide obtained by treating EMD through the method is low in impurity content, crystals are of an octahedral structure, spinel type lithium manganate is easier to fire compared with EMD, and the electrical performance of the lithium manganate positive electrode material prepared under the same technological formula is far better than that of lithium manganate prepared through traditional EMD.

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.

A high-purity gallium sesquioxide which contains gallium sesquioxide and one or more impurity elements that are elements other than gallium and oxygen, the total concentration of the impurity elements being 1 ppm by mass or less in glow discharge mass spectrometry, and the concentration of silicon as one of the impurity elements being 0.01 ppm by mass or more and 0.1 ppm by mass or less.

The invention discloses a direct X-ray detector, a preparation method thereof and application of the direct X-ray detector in X-ray detection in an extreme environment, and belongs to the technical field of X-ray detection. The direct X-ray detector comprises a sesquioxide, a positive electrode layer and a negative electrode layer, and the sesquioxide is arranged between the positive electrode layer and the negative electrode layer; the sesquioxide comprises any one of sesquioxide crystals, sesquioxide ceramics and sesquioxide glass. The sesquioxide crystal prepared by the invention has stable physical and chemical properties, excellent mechanical properties, excellent X-ray detection performance and extreme environment resistance, and a direct X-ray detector is prepared after a positive electrode layer and a negative electrode layer are sputtered on the top surface and the bottom surface respectively. The detector can tolerate extreme conditions such as extremely high detection temperature, high humidity, strong corrosion and the like, has excellent performance of high sensitivity and low detection limit, improves the accuracy of X-ray detection in an extreme environment, and meets the requirements of scientific and technological development.

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 present invention discloses a preparation method of lanthanum sesquioxide / praseodymium sesquioxide microspheres, which comprises the following steps: stirring and mixing glycerol and isopropanol evenly to obtain a first mixed solution; adding La(NO3)3·6H2O / Pr(NO3)3·6H2O to the obtained first mixed solution and stirring to make La(NO3)3·6H2O / Pr(NO3)3·6H2O evenly dispersed in the first mixed solution to prepare a second mixed solution; after the heating reaction of the second mixed solution is completed, cooling to room temperature to obtain a white precipitate; washing, centrifuging and drying the white precipitate to obtain the product La-glycerate / Pr-glycerate; calcining the La-glycerate / Pr-glycerate to prepare La2O3 microspheres / Pr2O3 microspheres. The method of the present invention has simple process, is easy to control, has high processing efficiency and low cost; the obtained product has regular morphology, uniform size and good dispersibility.

The invention relates to a beneficiation method for removing iron and aluminum sesquioxide from high-grade collophanite, and belongs to the technical field of mineral processing. The method comprises the following steps: performing crushing, superfine and grading on raw ore to obtain materials, and feeding the materials into gravity separation operation to obtain gravity separation concentrate and gravity separation tailings; the gravity concentrate is fed into a reverse flotation magnesium removal operation buffer tank, gravity tailings are thickened, after regrinding and grading, direct flotation desliming and direct flotation desilicication are conducted, and the obtained concentrate is subjected to reverse flotation magnesium removal operation; three water return pools are built for storing direct flotation desilicication return water, reverse flotation magnesium removal return water and reselection operation return water respectively. The method mainly aims at high-grade high-power semi-silicon-calcium collophanite, gravity-flotation combined separation quality-divided branch flotation is adopted, raw ore is divided into gravity concentrate and gravity tailings through gravity separation equipment, the gravity tailings are subjected to direct and reverse flotation to obtain gravity tailings flotation concentrate, the separation process fully utilizes the respective advantages of direct and reverse flotation and gravity separation, the technological process is stable, and the separation efficiency is high. And the separation effect is good, and high-quality and low-quality use of the phosphate concentrate is realized.

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.