135 results about "Scandium oxide" patented technology

The invention relates to the technical field of ceramic substrates, and provides a high-toughness aluminum oxide ceramic substrate and a preparation method thereof, the high-toughness aluminum oxide ceramic substrate comprises the following raw materials by weight: 100 parts of aluminum oxide, 1-3 parts of a plasticizer, 4-6 parts of an auxiliary agent, 4-6 parts of a binder, 1-3 parts of a dispersant, and 55-65 parts of water; the auxiliary agent is composed of an auxiliary agent A and an auxiliary agent B, the auxiliary agent A comprises rare earth oxide, and the auxiliary agent B is composed of molybdenum boride, scandium oxide and zirconium oxide. According to the technical scheme, the problem of low toughness of the aluminum oxide ceramic substrate in the prior art is solved.

The invention relates to the technical field of ceramic tiles, in particular to a ceramic tile with an iridescent structural color and a preparation method of the ceramic tile. The invention discloses a ceramic tile with an iridescent structural color. The ceramic tile comprises a green body, a cover glaze layer is arranged on the green body, a pattern layer is arranged on the cover glaze layer, a crystal glaze layer is arranged on the pattern layer, and a protective layer is arranged on the crystal glaze layer. The crystal glaze layer comprises the following raw materials in parts by weight: 30-50 parts of feldspar, 5-20 parts of quartz, 5-15 parts of dolomite, 5-10 parts of talc, 1-5 parts of kaolin, 2-7 parts of niobium pentoxide, 3-5 parts of zirconium silicate, 1-3 parts of yttrium oxide, 1-3 parts of cerium oxide and 0.5-2 parts of scandium oxide. According to the ceramic tile, various rare earth elements are added, mixed material dry particles of the crystal glaze layer form well-proportioned and staggered occlusion feather-shaped microstructures on the microscopic level, the micromorphology similar to natural turnip feathers is simulated in a bionic mode, and the special visual effect of iridescent structural color is shown.

The invention provides a method for recovering valuable metals from sulfuric acid process titanium white waste acid through steel slag treatment. The method comprises the following steps: recovering to obtain ferrous sulfate heptahydrate crystals; s2, recovering Sc metal, and extracting the filtrate in the step S1 to obtain a first loaded organic phase and a first raffinate; the first loaded organic phase is washed with alkali liquor, and a second loaded organic phase and washing water are obtained through reverse extraction; treating the washing water to obtain titanium phosphate; back-extracting the second loaded organic phase by using alkali liquor, carrying out filter pressing to obtain crude Sc (OH) 3, and refining to obtain scandium oxide; extracting the first raffinate to obtain a third loaded organic phase and a second raffinate, pickling the third loaded organic phase, reversely extracting with ammonia water, adding phosphoric acid for reaction, and treating to obtain titanium phosphate; and steel slag is added into the second raffinate for neutralization leaching and hydrolysis vanadium precipitation, vanadium-rich slag is obtained through filtering, and then the vanadium electrolyte is prepared. According to the method, iron is separated through crystallization, scandium and titanium are separated through extraction, vanadium-rich slag is separated through neutralization and precipitation, and efficient utilization of resources is achieved.

Disclosed in the present invention is a method for recovering Sc from an iron-aluminum slag in a lateritic nickel ore high-pressure acid leaching process, comprising the following steps: S1, leaching a raw material iron-aluminum slag by using sulfuric acid, and carrying out pressure filtration to obtain a leachate; S2, evaporating and concentrating the leachate to obtain a concentrated solution, and adding the raw material iron-aluminum slag and sodium sulfate into the concentrated solution to obtain a mixture; S3, pressurizing and heating the mixture, the pressurization pressure being 4.5-5.0 MPa and the heating temperature being 250-260°C, and then carrying out solid-liquid separation to obtain a slag phase and a liquid phase; and S4, sequentially carrying out extraction, back extraction, scandium salt precipitation, and roasting on the liquid phase to obtain scandium oxide. The recovery rate of scandium is high, and the steps are simple.

The invention relates to the technical field of separation and purification, in particular to a preparation method of a high-purity scandium oxide adsorbent with a mesoporous silicon-based shell, and aims to solve the technical problems in the prior art. According to the silicon-based adsorbent, the preparation method of the silicon-based adsorbent and the application of the silicon-based adsorbent to adsorption of associated impurities of scandium in rare earth ore liquid, the silicon-based adsorbent containing aluminum is large in scandium ion adsorption capacity and good in selectivity and has good application prospects in the aspect of a rare earth purification process. In order to solve the technical problem, the scheme provided by the invention is as follows: the adsorbent takes amorphous mesoporous silica as a skeleton, and organic functional group solvent mixing treatment is performed after the amorphous mesoporous silica is synthesized, so that resin groups are uniformly distributed on the surface of the skeleton and in the skeleton.

To provide an electrolyte particle for use in the manufacture of a solid oxide electrochemical cell, which is a solid electrolyte sintered body constituting a solid oxide electrochemical cell and which can be efficiently manufactured by sintering a densified sintered body having a high relative density at, for example, 1200°C or lower, and a dispersion liquid containing the electrolyte particle.SOLUTION: The present invention relates to an electrolyte particle containing at least one selected from (A) stabilized zirconia consisting of 3.0 to 10.0 mol% scandium oxide, 0 to 2.0 mol% cerium oxide, and 88.0 to 97.0 mol% zirconium oxide, (B) stabilized zirconia consisting of 0.5 to 15.0 mol% yttrium oxide and 85.0 to 99.5 mol% zirconium oxide, and (C) stabilized zirconia consisting of 0.5 to 15.0 mol% ytterbium oxide and 85.0 to 99.5 mol% zirconium oxide, and having a volume average particle diameter of 50 to 150 nm measured using a laser diffraction method.SELECTED DRAWING: Figure 1

The embodiment of the invention relates to a scandium-based negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a scandium-containing compound in deionized water to prepare a homogeneous solution, adding a coagulator, and stirring and mixing to obtain a first solution; placing the first solution in a heating device, and enabling a molecular chain of the coagulator to be broken and dissolved to form a cross-linked sol containing a scandium ion solution; standing the sol at room temperature to obtain solid gel; carrying out hot-pressing curing on the solid gel to obtain a cured sample with uniformly dispersed scandium ions; placing the cured sample in a tubular furnace for heat treatment to obtain a scandium nitride-containing carbon matrix, then placing the scandium nitride-containing carbon matrix in a surface oxidant solution for soaking to modify the scandium nitride-containing carbon matrix, washing the modified sample with water, performing suction filtration, and drying to obtain a modified scandium-based carbon matrix; or directly washing and filtering the scandium nitride-containing carbon matrix, and drying to obtain an unmodified scandium-based carbon matrix; and finally, calcining in an oxidizing atmosphere to remove residual carbon so as to obtain the scandium oxide nanoparticles.

The invention relates to the technical field of hydrometallurgy, in particular to a method for recycling scandium oxide from scandium slag, scandium oxide and application of the scandium oxide. According to the method, the scandium residues obtained from MHP are subjected to acid leaching, then pass through an N1923 extraction section, then pass through a P350 extraction section and then pass through an N235 extraction section, and finally a scandium chloride solution is subjected to scandium precipitation treatment and roasting, so that high-purity scandium oxide is obtained. The method has the advantages that an alkali reverse flow required by a scandium-containing loaded organic phase is avoided, the whole extraction section can be performed in an extraction tank without filtering operation, the automation degree is high, the continuity is good, the flow is short, and the acid consumption is greatly reduced, meanwhile, the amine extraction agent N1923 is firstly used and has strong selectivity on scandium, and when the amine extraction agent N1923 is used for separating most impurities in the first extraction section, the scandium content is greatly reduced; the temperature required by extraction and reverse extraction is lower than the temperature required by an acidic phosphine extraction agent, so that aging and deterioration of an organic phase are avoided, the stage number of the reverse extraction stage is greatly reduced, and the production cost is remarkably reduced.

The invention provides a beneficiation-metallurgy combined comprehensive utilization process for dilute separation tailings, which comprises the following steps: carrying out ore grinding and flotation treatment on the dilute separation tailings to obtain fluorite rough concentrate and flotation tailings; magnetically roasting the mixed reducing agent and the flotation tailings, and magnetically separating to obtain magnetically separated rough concentrate and magnetically separated rough tailings; carrying out fine grinding and magnetic separation on the magnetic separation rough concentrate to obtain a magnetic separation iron concentrate product and magnetic separation concentrate tailings; the magnetic separation coarse tailings and the magnetic separation fine tailings are mixed, and then acid washing liquid and acid washing residues are obtained after acid washing and solid-liquid separation are conducted in sequence; and carrying out pressurized acid leaching, solid-liquid separation and extraction on the pickling residues to obtain scandium oxide and niobium oxide. By adopting the flotation-magnetizing roasting-magnetic separation-acid pickling-pressurized acid leaching combined process, the fluorite coarse ore, the iron ore concentrate, the rare earth leaching solution and the niobium-scandium leaching solution are obtained, the comprehensive utilization rate of the tailings is greatly increased, the discharge amount of the tailings is reduced, the acid consumption of tailings treatment is reduced, the environmental pressure is reduced, and the benefits of enterprises are improved.

The invention provides a method for recovering scandium from scandium-containing lithium slag and a pretreatment method of the scandium-containing lithium slag. The method for recovering scandium from the scandium-containing lithium slag comprises the following steps: mixing the scandium-containing lithium slag with concentrated sulfuric acid, and heating and roasting to obtain a roasted product; the roasted product is subjected to water leaching, and scandium-containing leaching liquid and leaching residues are obtained; the scandium-containing leachate is extracted, and a scandium-containing organic phase and raffinate are obtained; washing the scandium-containing organic phase to obtain a purified scandium-containing organic phase and a washing solution; carrying out reverse extraction on the purified scandium-containing organic phase, and filtering to obtain a reverse extract; the reverse extract is subjected to acid dissolution, and a scandium-containing acid solution is obtained; adding oxalic acid into the scandium-containing acid solution for precipitation, filtering to obtain scandium oxalate precipitation, and roasting to obtain scandium oxide.

The present application is directed to a catalyst comprising a layer of metal oxide nanoparticles; and a mesoporous silica-containing shell surrounding the layer of metal oxide nanoparticles, wherein the mesoporous silica-containing shell has an outer surface and an inner surface inside the outer surface, the outer surface having openings leading to pores extending through said mesoporous silica-containing shell to the inner surface, wherein the metal oxide is selected from a group consisting of zirconium oxide, hafnium oxide, titanium oxide, niobium oxide, cerium oxide, molybdenum oxide, scandium oxide, yttrium oxide, and lanthanum oxide. The present application is also directed to a method of making such catalyst and a method for catalytically hydrogenolyzing a polymer with the catalyst into solvent, naphtha, diesel, kerosine, base oil, or wax-like products.

The invention discloses a rare earth doped upconversion single near-infrared luminescent scandium molybdate material and a preparation method thereof, and belongs to the technical field of luminescent materials. The structural formula of the up-conversion near-infrared luminescent material provided by the invention is (Sc < 1-x-y > Yb < x > Er < y >) < 2 > Mo < 3 > O < 12 >, x is equal to 0.1 to 0.3, and y is equal to 0.005 to 0.04. The preparation method is a high-temperature solid-phase method and comprises the following steps: weighing scandium oxide, ytterbium oxide, erbium oxide and molybdenum oxide as raw materials according to stoichiometry, uniformly mixing with absolute ethyl alcohol, drying, sufficiently grinding, pressing into sheets, presintering at 800 DEG C in a muffle furnace, heating to 1100 DEG C, and carrying out high-temperature solid-phase sintering. The prepared rare earth doped scandium molybdate up-conversion luminescent material has excellent near-infrared luminescence performance, and the regulation and control of the luminescence intensity can be realized by adjusting the rare earth doping proportion. Meanwhile, the preparation method is good in repeatability, high in yield, simple and feasible in preparation process, more energy-saving and environment-friendly in preparation process and suitable for industrial popularization.

The invention relates to the technical field of glazes, and discloses a preparation method of a high-strength antibacterial glaze, which is characterized in that ammonium dihydrogen phosphate, silver nitrate, europium nitrate and the like are used as raw materials, and silver ions and europium ions are loaded to hydroxyapatite to obtain silver / europium loaded hydroxyapatite. The high-strength antibacterial glaze is obtained by adding scandium oxide, silver / europium-loaded hydroxyapatite and the like into the basic glaze for ball milling and sieving. The silver / europium-loaded hydroxyapatite contains double antibacterial particles, namely silver ions and europium ions, so that the antibacterial property of the glaze is improved. Crystals generated after sintering of silver / europium-loaded hydroxyapatite and scandium oxide are filled in crystal grain gaps, so that the density is increased, and the strength of the glaze is improved. Tests prove that the glaze prepared by the invention has relatively good antibacterial property and relatively high strength.

The invention discloses a multi-band high-stability ferrite magnetic material composite formula and a preparation process, and relates to the technical field of magnetic materials. The ferrite magnetic material composite formula comprises 38-42 parts of ferric oxide powder, 37-41 parts of ferroferric oxide powder, 6-12 parts of graphene nanosheets, 5-7 parts of hydroxypropyl methyl cellulose, 6-9 parts of lanthanum oxide, 4-6 parts of scandium oxide, 1-3 parts of nano titanium dioxide, 4-6 parts of bismuth magnesium boron, 9-13 parts of ferric sulfate, 3-5 parts of manganese sulfate, 4-6 parts of zinc sulfate, 2-4 parts of copper sulfate and 2-3 parts of samarium sulfate. By utilizing a physical vapor deposition gradient doping process, the problems that an existing ferrite magnetic material is single in electromagnetic performance, cannot stably and efficiently work in a multi-frequency-band complex electromagnetic environment and cannot meet the requirements of the fields of communication, radar, electronic countermeasure and the like for wide-frequency-band and high-performance magnetic materials can be solved.

The invention discloses a method for recovering scandium from a byproduct ferrous sulfate monohydrate in a sulfuric acid process titanium white waste acid concentration process, which comprises the following steps: adding water to dissolve the byproduct ferrous sulfate monohydrate, filtering to obtain a first ferrous sulfate solution, and enabling the pH value of the first ferrous sulfate solution to be less than or equal to 2.5; the first ferrous sulfate solution reacts with metallic iron, iron ions in the solution exist in the form of ferrous ions, then filtering is conducted, and a second ferrous sulfate solution is obtained; adjusting the pH value of the second ferrous sulfate solution to 3.5-5 by adopting an alkaline substance, and filtering to obtain a third ferrous sulfate solution and scandium-containing filter residues; and adding acid into the scandium-containing filter residue, stirring, and then filtering to obtain a scandium-containing solution and a mixed solid of an insoluble titanium compound and calcium sulfate. According to the method, scandium in the scandium can be efficiently recycled, high-purity scandium oxide can be obtained, and the method is convenient to operate, simple in technological process, high in efficiency, low in production cost, good in environmental protection benefit and easy to industrialize.

The application discloses a preparation method of a homogenized aluminum-scandium intermediate alloy, and comprises the following steps: smelting: the scandium oxide, the molten salt and the aluminum ingot are heated to 1000-1200 DEG C, and then the temperature is kept at 900-1000 DEG C and stirred, the mass ratio of the scandium oxide, the molten salt and the aluminum ingot is 3.5-4.5:50-65:100; the aluminum-scandium intermediate alloy liquid is obtained through impurity removal and temperature keeping; the aluminum-scandium intermediate alloy is obtained through slagging, casting and cooling. Through process optimization, the aluminum-scandium intermediate alloy prepared by the preparation method has low segregation rate, uniform composition and low impurity content.

The invention discloses a solid oxide electrolyte material and a preparation method and application thereof, and relates to the technical field of batteries, the preparation method comprises the following steps: S1, mixing a metal compound, a cross-linking agent, a cross-linking agent monomer and water to form a pre-gel solution; the metal compound comprises ytterbium salt, cerium salt, zircon salt and scandium oxide; s2, performing gel curing on the pre-gel solution under the action of an initiator and a catalyst to obtain a gel product; and drying and sintering the gel product to obtain the solid oxide electrolyte material. The prepared electrolyte material has excellent conductivity and phase stability, the service life of the material can be prolonged, and the reliability of the material can be improved.

This application provides a method and system for extracting scandium from a scandium-containing cobalt-nickel hydroxide solution, belonging to the field of heavy metal recovery technology. The method includes the following steps: extracting the scandium-containing cobalt-nickel hydroxide solution with an organic extractant to obtain a scandium-containing organic phase; washing the scandium-containing organic phase to obtain a purified organic phase; back-extracting the purified organic phase with hydrochloric acid to obtain a scandium-containing back-extract and a back-extracted organic phase; performing scandium extraction treatment on the scandium-containing back-extract to obtain scandium oxide; and regenerating the back-extracted organic phase sequentially with sodium carbonate and dilute sulfuric acid to obtain a regenerated organic extractant, which is then reused. This application first sequentially washes the chlorine with sodium carbonate and sulfuric acid solutions, solving the emulsification problem in the extraction, washing, and back-extraction stages caused by washing with sodium carbonate solution. Furthermore, compared to directly using sulfuric acid solution for washing, this application uses less sulfuric acid in the regeneration stage, preventing phase miscibility during the washing process.

This invention provides a composite battery separator, its preparation method, and its application, relating to the field of lithium-ion battery technology. Specifically, the composite battery separator includes a base film and a coating loaded on at least one side of the base film; the coating includes organic components, inorganic components, and functional components; wherein the organic component includes polyethylene oxide (PEO), and the inorganic component includes scandium oxide and titanium dioxide. This invention improves the thermal stability, electrolyte affinity, and ionic conductivity of the separator by coating a mixture of inorganic metal materials and the organic component PEO onto the base film. Simultaneously, the nanoparticles formed by the mixed doping of scandium oxide and titanium dioxide effectively improve the uneven pore distribution on the surface of the polyolefin separator, reducing the formation of lithium dendrites.

The invention belongs to the field of inorganic ceramic materials, particularly relates to a scandium oxide modified continuous aluminum oxide-zirconium oxide high-temperature-resistant composite ceramic fiber and a preparation method thereof, and particularly relates to a technology for regulating and controlling the microstructure of the composite fiber through the synergistic effect of rare earth oxide and a preparation process so as to improve the high thermal stability. The fiber composite ceramic fiber comprises the following components in percentage by mass: 0.1 to 3 percent of scandium oxide, preferably 0.5 to 2.5 percent, further preferably 0.8 to 1.2 percent, 8 to 9.5 percent of zirconium oxide, preferably 8.8 to 9.2 percent, and the balance of aluminum oxide, the grain size of the aluminum oxide is 150 to 200nm, the grain size of the zirconium oxide at the grain boundary is 40 to 80nm, and the grain size of the zirconium oxide at the intragranular position is 5 to 20nm. The obtained product is subjected to heat preservation service for 100 hours at the temperature of 1200 DEG C in the air atmosphere and then cooled to the room temperature, and the grain size of aluminum oxide in the product is only 0.21-0.33 micron. The composition is reasonable in design, the preparation process is simple and controllable, and the obtained product is extremely excellent in heat resistance and mechanical property and convenient for industrial application.

The invention provides a semiconductor structure (10). The semiconductor structure (10) comprises a silicon substrate (12) in a [100] orientation; a scandium oxide layer (14) on the substrate (12) in the [111] orientation; and a scandium-rare earth-oxide layer (16) on the scandium oxide layer (14). The scandium-rare earth-oxide layer can have a graded composition to transition the lattice constant to match a subsequent layer, such as an indium nitride layer having a very high electron drift velocity. InN over Si (100) provides transistors, photons, and passive electronics that operate in the terahertz frequency range.

The invention discloses a titanium white waste acid treatment process, and relates to the technical field of industrial waste regeneration. The titanium white waste acid is subjected to microfiltration and membrane electrolysis treatment, sulfuric acid is separated and recycled under the control of constant pressure and constant current, and residual liquid is subjected to electrodialysis treatment to oxidize ferrous ions into ferric hydroxide precipitates and calcined into ferric oxide; carrying out reduction leaching on the titanium-containing material, hydrolyzing to generate metatitanic acid, and calcining to obtain titanium dioxide; oxidizing the hydrolysate to precipitate vanadate, and calcining to obtain vanadium pentoxide; adjusting the pH value of the filtrate, selectively adsorbing scandium through a biological adsorption column, precipitating and calcining the eluent to obtain scandium oxide, and regenerating and recycling the adsorbent through acid pickling. According to the process, through multi-stage treatment and biological adsorption, resource recycling of sulfuric acid, iron, titanium, vanadium and scandium components in the waste acid is achieved, the process is clean and efficient, secondary pollution of a traditional process is avoided, and a green low-carbon solution is provided for waste acid treatment in the titanium dioxide industry.

The invention belongs to the field of photocatalytic functional materials, and discloses a preparation method and application of a scandium monatomic anchored polytriazine imide photocatalytic material. In a high-temperature molten salt medium, scandium oxide and a melamine precursor are subjected to a synchronous reaction, so that scandium is anchored in a polytriazine imide carrier lattice in a monatomic form. Scandium is stably anchored on the surface of the polytriazine imide carrier in an atomic-scale dispersion form. The structure can synergistically increase active sites and effectively promote separation and migration of photo-induced electron-hole pairs, so that the activity of the material in photocatalytic synthesis of hydrogen peroxide is remarkably improved.

The embodiment of the present application relates to a kind of scandium negative electrode material and its preparation method and application.The preparation method includes: the homogeneous solution obtained by dissolving the ion-free aqueous solution of scandium-containing compound, first solution is obtained by adding coagulation agent and stirring mixing;First solution is placed in heating device, the molecular chain of coagulation agent is broken and dissolved, and the sol of cross-linked scandium ion-containing solution is formed;The solid gel is obtained by the sol at room temperature;Solid gel is heat-pressed and cured to obtain the solidified sample of scandium ion uniform dispersion;The carbon matrix containing scandium nitride is obtained by heat treatment of solidified sample in tube furnace, and the carbon matrix containing scandium nitride is modified by soaking in surface oxidizing agent solution, the modified sample is washed with water and suction filtered, and the modified scandium-based carbon matrix is obtained after drying;Or the carbon matrix containing scandium nitride is directly washed with water and suction filtered, and the unmodified scandium-based carbon matrix is obtained after drying;Finally, under oxidizing atmosphere, the residual carbon is removed to obtain scandium oxide nanoparticles.

The invention relates to a polycrystalline fused product of formula (Sc2O3)yAx(ZrO2 + HfO2)1-x-y, with 0.030 ≤ y ≤ 0.150, and 0.000 ≤ x ≤ 0.070, and x ≤ y, A denoting an additive selected from Y2O3, Al2O3, CeO2, Yb2O3, Gd2O3, MnO, Bi2O3, La2O3, Pr2O3, Nd2O5, Sm2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5 and mixtures thereof, ZrO2 + HfO2 + Sc2O3 + A representing more than 98% of the mass of the fused product, MnO expressing the total content of manganese oxides expressed in the form MnO, Pr2O3 expressing the total content of praseodymium oxides expressed in the form Pr2O3, Nd2O5 expressing the total content of neodymium oxides expressed in the form Nd2O5, Tb4O7 expressing the total content of terbium oxides expressed as Tb4O7, Ta2O5 expressing the total content of tantalum oxides expressed as Ta2O5, and Nb2O5 expressing the total content of niobium oxides expressed as Nb2O5.

The invention belongs to the technical field of ceramic metal composite materials, and particularly relates to a multiphase ceramic composite plate and a preparation method thereof, and a metal-based ceramic composite lining plate for a ball mill and a preparation method thereof. The composite material comprises the following components in parts by weight: 70-90 parts of zirconium oxide, 5-10 parts of silicon carbide, 5-10 parts of aluminum oxide, 2-6 parts of titanium dioxide, 2-5 parts of tungsten carbide, 2-4 parts of scandium oxide, 2-4 parts of cobalt oxide, 1-3 parts of potassium tantalate, 1-3 parts of potassium titanate, 1-2 parts of bismuth trioxide and 1-2 parts of erbium oxide. A compact ceramic plate is obtained through mixing, wet grinding, drying, pressing and high-temperature sintering, and the special-shaped ceramic sheet is formed through further crushing and screening. The special-shaped sheet is laid in a mold and filled with high-chromium cast iron powder, and the integrated metal-based ceramic composite lining plate with a stable structure is formed through compaction and high-temperature sintering. The prepared lining plate has the high hardness of ceramic and the toughness of metal, and is suitable for high-abrasion equipment such as a ball mill.

The application discloses a beneficiation-metallurgy combined method for comprehensively recovering niobium, silicon and scandium from niobium-containing tailings, and belongs to the technical field of mineral processing and metallurgical engineering. The application first adopts one roughing and two cleaning flotation to obtain a niobium rough concentrate, and then adopts hydrogen-based mineral phase conversion roasting to activate the niobium rough concentrate, and the roasting product is subjected to acid leaching, so that niobium and scandium enter into a leaching solution, and silicon is enriched in a leaching residue; the leaching solution is subjected to solvent extraction, precipitation and calcination to obtain a niobium oxide product; the leaching residue is subjected to alkali leaching and pH adjustment to obtain white carbon black; and the raffinate is subjected to selective extraction to obtain a scandium oxide concentrate. The preparation method has the advantages of low-temperature hydrogen-based roasting, low carbon and low energy consumption, and can realize the step-by-step recovery of three valuable products, realizes the high-value utilization of all components of the niobium tailings, and has the advantages of mild process conditions, a niobium recovery rate of greater than or equal to 70% in the whole process, a scandium recovery rate of greater than or equal to 60% in the whole process, a white carbon black SiO2 content of greater than or equal to 95%, and good industrial application prospect.

The invention relates to a preparation method of a composite material, which comprises the following steps: providing a preform consisting of continuous carbon fibers, arranging the carbon fibers in the preform in a single layer, and aligning the fibers through a polyester net and an adhesive; zirconium boride powder is mixed with silicon carbide and scandium oxide, the mixed powder is mixed with the dispersion liquid, and slurry is prepared through ball milling homogenization; the prefabricated bodies are laid in a mold layer by layer, the space between every two layers is soaked with the slurry so that the fiber surface can be evenly covered, the prefabricated bodies are stacked at the 0-degree configuration, and at least 30 layers are stacked to prepare a plate with the thickness being 3-3.5 mm; in a vacuumizing state, curing the plate at 80 DEG C for 2 hours to form a stable composite structure; controlling the sintering time and temperature gradient promotes densification of the composite structure but prevents formation of an interface layer.

This invention relates to a method for preparing a composite material, comprising: providing a preform composed of continuous carbon fibers, wherein the carbon fibers in the preform are arranged in a single layer and the fibers are aligned by a polyester mesh and an adhesive; mixing zirconium boride powder with silicon carbide and scandium oxide, mixing the mixed powder with a dispersion, and homogenizing by ball milling to prepare a slurry; laying the preform layer by layer in a mold, and impregnating each layer with the slurry to uniformly cover the fiber surface, the preforms being stacked at 0° configuration, and at least 30 layers are stacked to prepare a plate with a thickness of 3–3.5 mm; curing the plate at 80°C for 2 hours under vacuum to form a stable composite structure; and controlling the sintering time and temperature gradient to promote densification of the composite structure but prevent the formation of an interface layer.