115 results about "Scandium" patented technology

The method comprises the following steps: weighing an oxide precursor of metal indium, an oxide precursor of metal M, an ammonium salt and a lithium salt according to a chemical formula of indium-based halide, fully mixing, and calcining in an inert atmosphere to obtain the indium-based halide solid electrolyte. Forming an indium-based halide solid electrolyte through a solid-phase reaction; wherein M is selected from at least one of magnesium, calcium, strontium, barium, aluminum, gallium, indium, bismuth, scandium, yttrium, zinc, germanium, tin, lanthanum, cerium, samarium, gadolinium, holmium, erbium and ytterbium. The method can greatly simplify the synthesis process, reduce the raw material cost and realize industrial batch preparation.

The invention discloses a process for separating and recycling scandium, manganese and iron in iron-manganese slag, and belongs to the technical field of metallurgical engineering and comprehensive utilization of secondary resources. The method comprises the following steps: crushing the iron and manganese slag, mixing the crushed iron and manganese slag with a chlorinating agent and a molten salt medium, and carrying out chlorination reaction at 600-850 DEG C, so that iron and manganese are converted into chlorides to volatilize, and scandium is enriched in the slag; the volatile gas is subjected to multi-stage gradient condensation, and manganese and iron concentrates are respectively recovered in different temperature intervals; and leaching-extracting the chlorination residues to obtain a scandium-rich substance. According to the method, source separation and collaborative recovery of iron, manganese and scandium are achieved through pyrogenic process chlorination-condensation, the problems that in a traditional wet process, metal interferes with one another, the process is long, and pollution is heavy are solved, and the method has the advantages of being short in process, small in pollution and high in recycling degree.

The invention provides a laterite-nickel ore leaching solution catalytic oxidation-fractional precipitation method, and relates to the field of hydrometallurgy, the method comprises the following steps: adding a catalytic oxidant and a first neutralizer into a laterite-nickel ore leaching solution to obtain a first filtrate and iron slag; adding a catalytic oxidant, a second neutralizer and a first coalescing agent into the first filtrate to obtain a second filtrate and a second precipitate; adding a third neutralizer and a first reducing agent into the second filtrate to obtain a nickel-cobalt precipitate and a third filtrate; adding a fourth neutralizer and a second reducing agent into the third filtrate to obtain a fourth precipitate and a fourth filtrate; mixing the second precipitate with a third reducing agent, performing reduction leaching, and adding a second coalescing agent and a fifth neutralizing agent to obtain a silicon-aluminum precipitate and manganese-scandium filtrate; the manganese-scandium filtrate is extracted, and manganese enters raffinate; and adding a catalytic oxidant and a sixth neutralizer into the raffinate to obtain the manganese oxide. Elements are recycled step by step, and the method has the advantages of multiple types of recycled elements, less resource waste and the like.

The invention belongs to the field of mineral treatment, and particularly relates to a selective leaching method for scandium in a scandium-containing mineral, which comprises the following steps: roasting the scandium-containing mineral and an additive to obtain a roasted material, and mixing the roasted material with a leaching agent for leaching to obtain a scandium-rich leachate; the additive is an inorganic salt of at least one cation of sodium, calcium, potassium and ammonium; the leaching agent comprises an aqueous solution of a component A and an aqueous solution of a component B, wherein the component A is a C2-C10 water-soluble binary or above carboxylic acid compound; the component B is a water-soluble salt of the component A; the molar ratio of the component A to the component B is 1: (0.5-5); and the concentration of the component A in the leaching agent is 1-15 mol / L. According to the method, the scandium-containing mineral is roasted and modified through the additive, and then the scandium-containing mineral is leached through the buffer system containing the component A and the component B, so that synergy can be achieved, and scandium in the scandium-containing mineral can be selectively and efficiently extracted.

The invention discloses a metallurgical solid waste all-component collaborative recovery and high-value utilization method, and belongs to the technical field of metallurgical resource recycling and green metallurgy. According to the method, blast furnace gas sludge, iron-manganese slag and vanadium extraction converter sludge are synergistically blended, and after briquetting and drying, reduction smelting is carried out in an inert atmosphere. Reducing the iron into molten iron; volatile metals such as zinc, indium and gallium are evaporated and enter flue gas, and gallium-indium alloy, crude zinc and residual ash are recovered in a graded manner through a multi-stage condensation system; the slag is subjected to acid leaching to enrich scandium, the leaching liquid is separated to extract vanadium, manganese and scandium, and the leaching slag is used for preparing low-carbon cement. According to the method, all-component collaborative recovery of valuable metals in various metallurgical solid wastes and building material utilization of residual solid wastes are realized, and the method has the advantages of high resource efficiency and environmental friendliness.

A method of forming a film on a surface of a substrate in an internal volume of a reactor is provided. The method includes: dosing the surface of the substrate with a scandium precursor; purging the scandium precursor from the internal volume of the reactor; dosing the surface of the substrate with a co-reactant; and purging the co-reactant from the internal volume of the reactor.

A comprehensive utilization method for valuable elements in hydrometallurgical slag of laterite nickel ore, comprising the following steps: S1. placing an iron-aluminum slag produced by laterite nickel ore hydrometallurgy in a tube furnace, and introducing an HCl gas stream for a one-stage distillation at 185-290° C. to obtain a one-stage distillation tail gas and a one-stage distillation residue; and condensing the one-stage distillation tail gas to obtain anhydrous AlCl3; S2. introducing an HCl gas stream to the one-stage distillation residue for a two-stage distillation at 320-500° C. to obtain a two-stage distillation tail gas and a two-stage distillation residue; and condensing the two-stage distillation tail gas to obtain anhydrous FeCl3; S3. subjecting the two-stage distillation residue to a leaching treatment by using a leaching solution to obtain a leaching residue and a leaching solution; subjecting the leaching solution to a scandium precipitation treatment to obtain a scandium precipitate and a de-scandiumed liquid; S4. adjusting the pH value of the de-scandiumed liquid to obtain an MHP. The obtained aluminum, iron, and scandium products have high purity and high recovery.

The application belongs to the technical field of laser materials, and relates to a holmium-praseodymium-scandium doped composite calcium fluoride single crystal as well as a preparation method and application thereof. 0.01 Pr x Sc y Ca 0.99‑x‑y F 2.01+x+y , wherein 0.005 <= x <= 0.015, 0.005 <= y <= 0.05; the crystal is obtained by growing the crystal in a vacuum environment through a temperature gradient method. Compared with the prior art, the application can realize high-efficiency laser output in a 2-3 mu m mid-infrared wave band, the grown crystal has the characteristics of high thermal conductivity, high chemical stability, high transmittance and high quality, and has the advantages of high gain bandwidth, high gain cross section, high power and high slope efficiency in the mid-infrared wave band, and has significant advantages in the fields of environmental monitoring, industrial processing, national defense and safety.

The invention discloses a hexagonal scandium hydrogen compound and a preparation method thereof, and the preparation method comprises the following steps: taking a borane ammine complex as a solid hydrogen source, tabletting the borane ammine complex and elemental scandium through a mold, and stacking according to'hydrogen source-scandium-hydrogen source '; loading the assembly into a CVD diamond single crystal tube with holes, and carrying out secondary wrapping with NaCl to form a sealed reaction unit; carrying out segmented pressurization / depressurization in a cubic press, electrifying and segmented heating under the condition of 800-1200 DEG C, and carrying out pressure maintaining and cooling to complete synthesis; according to the method, local high hydrogen partial pressure is established under the action of moderate high pressure and double-layer sealing, external introduction of high-pressure hydrogen is avoided, and the equipment complexity and the safety risk are reduced; the product prepared by the invention is hexagonal-phase ScH3, can stably exist at normal temperature and normal pressure, and is different from cubic-phase ScH3 which can only be synthesized under an extreme high-pressure condition and cannot be kept stable after pressure relief, XRD and structure refinement are consistent with the standard, and the process can be repeated and amplified.

The invention discloses a high-strength magnesium-zinc-yttrium rare earth 3D printing alloy and application, and belongs to the technical field of 3D printing alloys, the high-strength magnesium-zinc-yttrium rare earth 3D printing alloy comprises the following components in parts by mass: 87.5-91.0 parts of magnesium, 6.0-8.0 parts of zinc, 2.0-3.0 parts of yttrium, 1.5-2.5 parts of gadolinium, 1.0-2.0 parts of scandium, 0.8-1.5 parts of zirconium, 0.5-1.2 parts of calcium and 0.28-0.6 part of manganese, the total mass of metal impurities does not exceed 0.15 part, and the balance is magnesium. A single metal impurity does not exceed 0.05 part; the alloy application comprises the following steps of S1, smelting and atomization, S2, screening and treatment, S3, printing forming and S4, aftertreatment. The alloy with excellent 3D printing formability, ultrahigh strength, good toughness and reliable thermal stability is developed through collaborative design of multi-component components, accurate control of key process parameters and systematic optimization of a post-treatment system; an ideal material is provided for manufacturing of light-weight and high-performance complex components in the fields of aerospace, high-end medical instruments and the like.

The present invention provides a method for providing a composite luminescent particle, comprising: (a) providing (i) a luminescent material comprising (A1-xBx) 3 (C1-yDy) 5O12 nanoparticles or a precursor thereof, A comprising one or more of yttrium, lutetium, gadolinium, lanthanum; b comprises one or more rare earth elements; c comprises one or more of aluminum, gallium and scandium; d comprises one or more transition metal ions; 0 < = x < = 1, 0 < = y < = 1, x + ygt; 0; and (ii) also providing an oxide material precursor, the oxide material having a melting point of at least 850 DEG C; (b) mixing (i) a luminescent material comprising (A1-xBx) 3 (C1-yDy) 5O12 nanoparticles or a precursor thereof with (ii) an oxide material precursor; (c) curing the oxide material precursor to obtain cured particles which comprise a luminescent material and an oxide material coating layer; (d) heating the cured particles at a first temperature of 600 DEG C or more for a first duration of 10 minutes or more; and (c) heating the cured particles at a second temperature of 700 DEG C or more for a second duration of 1 hour or more in a reducing atmosphere including carbon monoxide.

The application discloses a scandium-based MOF crystal material, a preparation method and application thereof. The MOF crystal is formed by [Sc3(mu2-OH)3(CO2)4O6] n The three-dimensional porous framework structure is formed by the mutual connection of an inorganic metal chain, 2,5-thiophene dicarboxylic acid and a nitrate ion, is directly synthesized by a solvothermal reaction with a metal Sc based on the ligand 2,5-thiophene dicarboxylic acid, and has relatively mild, simple and easy reaction conditions. The MOF crystal has high crystallinity, excellent thermal stability, water stability, solvent stability and wide pH stability. Under normal temperature and pressure, C3H6 is preferentially adsorbed, then C2H6, and finally C2H4, and the MOF crystal has good C3H6 / C2H4 and C2H6 / C2H4 separation performance, thereby obtaining high-purity C2H4 and recovering C3H6, and can be applied to the effective separation of C2H4 and C3H6 in a methanol-to-olefin (MTO) mixture.

The present application relates to the technical field of mineral processing engineering, and particularly relates to a chemical beneficiation method for upgrading and reducing calcium content of mixed rare earth concentrate. The chemical beneficiation method of the present application mainly comprises multiple procedures such as chemical leaching, separation and optional drying, wherein the chemical leaching is carried out in two stages. The chemical beneficiation method of the present application reduces the content of calcium oxide in the rare earth concentrate, improves the grade of the mixed rare earth concentrate, provides conditions for separating bastnaesite from monazite and clean development of rare earth smelting, is beneficial to the optimization and improvement of the rare earth smelting process, and reduces the pollution to the environment; provides raw materials for niobium and scandium extraction; the generated intermediate products can be converted into products, basically realizing zero emission, achieving the purpose of comprehensive utilization, and the whole method is green, environmentally friendly and waste-free.

This invention discloses an alkaline leaching and carbonization treatment method for scandium-containing materials, belonging to the technical field of wet processing of scandium-containing materials. The method includes: alkali leaching the scandium-containing material to obtain a mixed slurry; passing carbon dioxide through the mixed slurry for selective scandium leaching via carbonation; and performing liquid-solid separation to obtain a scandium-containing leaching solution and a leaching residue. This invention, through alkaline leaching followed by carbonization, selectively leaches scandium from the scandium-containing material, while zirconium and components with similar properties, as well as other impurities, remain in the residue without leaching. Based on the scandium-containing leaching solution obtained after liquid-solid separation, scandium recovery rate and purity can be improved.

The application discloses a high-copper high-scandium Al-Cu-Mg casting alloy with long-term thermal stability and a heat treatment process. The composition of the casting alloy is as follows: Cu 5.0-6.6%, Mg 0.10-0.40%, Mn 0.20-0.50%, Ti 0.05-0.10%, Zr 0.10-0.25%, Sc 0.10-0.60%, and the rest is Al. According to some examples of the application, the morphology, content and distribution of the W phase are changed through the heat treatment process, and the room-temperature mechanical properties and thermal stability of the high-copper high-scandium Al-Cu-Mg casting alloy are improved. Firstly, the Sc and Zr atoms are precipitated in the form of Al3(Sc, Zr) through low-temperature homogenization, and the formation of the W phase in the medium-temperature homogenization process is reduced. The content of the Sc atoms is reduced under the medium-temperature condition, so that the content of the W phase is reduced and the W phase is dispersedly distributed; and secondly, according to the phase transition point of the W phase, part of the W phase is dissolved through high-temperature homogenization, a certain amount of Cu and Sc atoms are released, the θ' and Ω phases are precipitated in the aging process, the Sc atoms are segregated at the θ'-Al2Cu interface in the thermal exposure process, and thus the high-copper high-scandium Al-Cu-Mg casting alloy with long-term thermal stability is obtained.

An object of the present invention is to provide a novel method for recovering rare earth elements capable of separating Sc (scandium), a rare earth element contained in steel slag, from other rare earth elements and recovering these rare earth elements. A method for recovering rare earth elements contained in steel slag, comprising: An leaching step of contacting steel slag with an acid to obtain a leachate 1; A solvent extraction step 1 of adjusting the pH of the leachate 1, adding an organic solvent, separating it into an organic phase 1 and an aqueous phase 1, and extracting; A back-extraction step 1 of separating and extracting the aqueous phase back-extracted from the organic phase 1 as a recovery liquid 1; A precipitation step of adjusting the pH of the aqueous phase 1 and precipitating a precipitate in the aqueous phase 1; A solid-liquid separation step of solid-liquid separating the precipitate from the aqueous phase 1 to obtain an aqueous phase 1'; A solvent extraction step 2 of adjusting the pH of the aqueous phase 1', adding an organic solvent, separating it into an organic phase 2 and an aqueous phase 2, and extracting; A back-extraction step 2 of separating and extracting the aqueous phase back-extracted from the organic phase 2 as a recovery liquid 2; A method comprising:

This invention discloses a comprehensive recovery method for nickel, cobalt, manganese, and scandium, belonging to the field of metal production or refining technology. The method includes: pretreatment of nickel-cobalt hydroxide by ultrasonic grinding with oxygen / air introduction; selective leaching of the pretreated nickel-cobalt hydroxide with dilute sulfuric acid solution, followed by solid-liquid separation to obtain manganese oxide slag and a first leachate; using a synergistic extraction system formed by a compound of an organophosphate extractant, a neutral phosphorus-oxygen extractant, and an organic diluent as the first extractant; scandium extraction of the first leachate using the first extractant to obtain a scandium-loaded organic phase and raffinate; precipitation of vanadium and removal of iron in the raffinate, followed by solid-liquid separation to obtain iron alum slag and a second leachate; and nickel-cobalt extraction of the second leachate to obtain a nickel-cobalt-loaded organic phase. This invention enables efficient recovery of nickel, cobalt, manganese, and scandium, and effective separation from impurities.

The invention relates to an efficient scandium extraction method for scandium-containing aluminum slag based on nitric acid gradient leaching, and belongs to the technical field of valuable metal recovery in smelting slag. The scandium-containing aluminum slag is pretreated; the pretreated scandium-containing aluminum slag is subjected to gradient temperature control leaching; first-stage leaching: leaching aluminum and magnesium impurities from a low-temperature and low-concentration nitric acid solution, and carrying out solid-liquid separation to obtain leaching residues; second-stage leaching, specifically, scandium is leached out of the leaching residues in a targeted mode through a high-temperature high-concentration nitric acid solution, and scandium-containing nitric acid leaching liquid is obtained; and a purification process: carrying out extraction, acid pickling impurity removal and reverse extraction on the scandium-containing nitric acid leaching solution to obtain Sc (OH) 3 precipitate. According to the method, scandium in the scandium-containing aluminum slag can be effectively recycled, and the method is simple in technological process, mild in reaction condition and free of high pressure.

The invention relates to the technical field of composite carbon materials, in particular to a metal carbide modified carbon material and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: mixing a carbon material with a modification element precursor to obtain mixed powder; and calcining the mixed powder in a protective atmosphere or a vacuum environment to obtain the metal carbide modified carbon material, the modification elements in the modification element precursor comprise one or more of scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, yttrium, zirconium, niobium, molybdenum, technetium, ruthenium, rhodium, palladium, hafnium, tantalum, tungsten, iridium and rhenium; the carbon material is an unmodified carbon material or a three-dimensional structure graphene modified carbon material. According to the preparation method, the coupling and adhesion capacity between the metal carbide and the carbon material can be remarkably improved, so that the carbon material has excellent structural stability, and the carbon material is applied to the fields of thermal management materials, high-strength and high-conductivity metal-based composite materials, high-conductivity and high-thermal-conductivity resin-based composite materials and polishing agent abrasives.

The invention discloses a method for efficiently recovering scandium from MHP pickle liquor based on CA-100 synergistic extraction, and belongs to the technical field of hydrometallurgy. The method comprises the following steps that S1, MHP is leached through acid liquor, and leachate containing nickel, cobalt and scandium is obtained; s2, scandium is extracted from the leachate through an organic phase containing a CA-100 synergistic extraction system, a scandium-rich organic phase is subjected to water washing and sulfuric acid reverse extraction, and a scandium-containing solution is obtained; s3, the scandium-containing solution is subjected to hydrolytic precipitation through alkali liquor, and scandium hydroxide is obtained.According to the method, high-selectivity and efficient extraction of scandium in the high-nickel and high-cobalt solution can be achieved through a synergistic extraction system composed of C272 and other synergistic extraction agents and a CA-100 extraction agent, the CA-100 synergistic extraction system can be subjected to reverse extraction through acid liquor, and the scandium content in the solution can be greatly reduced; the technical problems that residual oil is difficult to separate and reverse extraction is difficult in an existing extracting agent are effectively solved, and the operability and industrial application potential of the process are improved.

The invention belongs to the field of rare earth resource recovery, and particularly relates to a method for selectively leaching scandium in rare earth iron-rich minerals, which comprises the following steps: adding a reducing agent A and a sodium-based activator B into the rare earth iron-rich minerals, and then carrying out heat preservation roasting treatment at the temperature T for the heat preservation time t, so that iron in the rare earth iron-rich minerals is reduced into metal iron; the activation of scandium and the conversion of rare earth to an insoluble double salt form are synchronously realized; the reducing agent A can be lignite and the like; the sodium-based activating agent can be sodium carbonate and the like; the temperature T ranges from 950 DEG C to 1100 DEG C; the time t is 1 to 2 hours. The invention further comprises a scheme of roasting mineral grinding-magnetic separation of iron and an acid leaching scheme of the activated scandium-containing rare earth material. According to the activation method, reduction of iron and efficient leaching of scandium can be achieved, meanwhile, rare earth elements are promoted to be converted into an indissolvable form, and therefore efficient separation of scandium and other rare earth is achieved, and the follow-up separation difficulty is remarkably reduced.

The invention relates to an adsorbent for adsorbing and separating bisphenol A and 2, 4-bisphenol A and an adsorption and separation process thereof. The adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of silicon oxide to aluminum oxide is 2.5: 1-15: 1, the contained rare earth metal is one or a combination of lanthanum, cerium, scandium and yttrium, the molar ratio of silicon to rare earth metal is 10: 1-1000: 1, and the rare earth metal exists in the form of metal ions. The adsorption separation process comprises the following steps: enabling a mixture containing bisphenol A, 2, 4-bisphenol A, triphenol and chroman in the crystallization mother liquor to be in contact with an adsorbent in an adsorption separation reactor for adsorption separation, and enabling the bisphenol A and the 2, 4-bisphenol A obtained after adsorption separation to enter an isomerization reaction unit; triphenol and chroman obtained after adsorption separation enter a cracking reaction unit. Phenol is used as an eluent, the affinity with the adsorbent is strong, and the elution efficiency reaches 95% or above.

This invention relates to the field of laser cladding technology, specifically to a toughened and reinforced laser cladding alloy powder and its preparation process. It solves the problem of poor hardness and toughness of the cladding layer formed by existing laser cladding alloy powders during use. This laser cladding alloy powder incorporates scandium / erbium-loaded nano-silica and tannic acid-hydroxypropyl cellulose-coated boron nitride. Loading scandium and erbium onto the nano-silica improves the wear resistance and tensile strength of the cladding layer. Coating the boron nitride surface with tannic acid-hydroxypropyl cellulose powder improves the wettability between boron nitride and the metal matrix, reducing interface defects. The synergistic effect of rare earth elements and boron nitride reduces porosity and cracks in the cladding layer. It also improves density by refining grains and strengthening interfacial bonding, further enhancing the material's wear resistance and tensile strength, ensuring service life and reliability under high temperature and high stress environments.

The invention relates to a method for strengthening extraction separation of scandium and iron in an acid solution, and belongs to the technical field of hydrometallurgy. According to the method, after a proper amount of fluorine ions are added into the acid solution containing scandium and iron, under the synergistic effect of pH of the system, the species existence form of the iron ions in the solution is changed, the binding reaction of the iron ions and the extraction agent is reduced, the iron ions are retained in a water phase in the extraction process, and the scandium ions in the solution do not react with the fluorine ions, so that the content of the scandium ions in the solution is reduced. The extraction efficiency is not influenced by the addition of fluorine ions. By adopting the optimized process and the process parameters, the distribution ratio of iron ions in an organic phase can be remarkably reduced, so that the selective separation coefficient of scandium and iron in the extraction process is greatly improved. According to the method, a traditional scandium extraction technological process does not need to be changed, the scandium and iron separation effect is better, the adaptability to extraction and separation of scandium and other common impurity metal ions (titanium, aluminum and the like) is high, and industrial application is facilitated.

The application relates to the technical field of catalytic combustion of ethane, and discloses a preparation method and application of a catalytic combustion catalyst for ethane, which comprises the following steps: (1) dissolving chloroplatinic acid, a transition metal M1 nitrate and a rare earth metal M2 nitrate in water to obtain a mixed salt solution; and dripping the mixed salt solution into a molecular sieve carrier to perform impregnation, so as to obtain a solid A; (2) pre-drying the solid A, and then continuously drying after temperature rising, so as to obtain a powder B; and (3) performing aerobic calcination on the powder B, so as to obtain a catalyst; the catalyst is PtM1M2 / S, wherein M1 is one or more of iron, cobalt, nickel, manganese and copper, M2 is one or more of cerium, lanthanum, scandium, yttrium and samarium, and S is a molecular sieve carrier. The rare earth metal and the transition metal are synergistically doped, a strong interaction is formed between the rare earth metal and the transition metal and the noble metal platinum, the activation of ethane can be effectively enhanced, the reaction temperature can be reduced, and the conversion rate and stability of ethane can be improved.

This invention belongs to the field of intelligent piezoelectric materials technology, and discloses a grain-oriented piezoelectric ceramic material and its preparation method. The grain-oriented piezoelectric ceramic material is... <001> Oriented and ferromagnetic barium titanate / strontium-based template seed crystals, with the general formula: X Pb 1‑1.5x R x (B1,B2)O3- Y Pb 1‑y A y (B1,B2)O3-(1- X - Y-Z PbB3O3- Z The ceramic matrix of PbTiO3, wherein A is one or more of barium, strontium, calcium, and bismuth; B1 is one or more of magnesium, nickel, indium, and scandium; B2 is one or more of niobium, tantalum, and antimony; B3 is zirconium or tin; and R is one or more of Sm, La, Nd, Eu, Ce, Pr, Dy, and Er. x is between 0.001 and 0.2, y does not exceed 0.1; X is between 0.1 and 0.3, Y is between 0 and 0.2, and X+Y+Z=1. The raw materials are calcined according to the general formula to obtain perovskite powder. Subsequently, through casting, lamination, cutting, debinding, and calcination, the grain-oriented piezoelectric ceramic is finally obtained. This process can achieve high piezoelectric performance while maintaining a high Curie temperature, solving the problem of the incompatibility between high piezoelectric performance and high phase transition temperature in materials.

A plate-shaped alumina particle comprising at least one element (A) selected from the group consisting of iron, nickel, copper, chromium, cobalt, zinc, scandium and ruthenium, and titanium.

This invention belongs to the field of rare earth resource recovery, specifically relating to a method for selective leaching of scandium from rare earth iron-rich minerals. The method involves adding a reducing agent A and a sodium-based activator B to the rare earth iron-rich minerals, followed by calcination at a temperature T for a holding time t. This reduces the iron in the rare earth iron-rich minerals to metallic iron, simultaneously activating scandium and converting rare earth elements into insoluble complex salts. The reducing agent A can be lignite, etc.; the sodium-based activator can be sodium carbonate, etc.; the temperature T is 950-1100℃; and the time t is 1-2 hours. This invention also includes a scheme for separating iron through grinding and magnetic separation of the calcined minerals and an acid leaching scheme for the activated scandium-containing rare earth materials. The activation method of this invention can achieve iron reduction and efficient scandium leaching while simultaneously promoting the conversion of rare earth elements into insoluble forms, thereby achieving efficient separation of scandium from other rare earth elements and significantly reducing the difficulty of subsequent separation.

The invention belongs to the technical field of rare earth recovery, and particularly relates to a method for extracting scandium from titanium dioxide waste acid by using a modified chitosan adsorbent, which comprises the following steps: (1) adding the adsorbent into the titanium dioxide waste acid, uniformly mixing for adsorption reaction, and filtering the mixed solution after adsorption to obtain a scandium-loaded adsorbent and a water phase containing other metal elements; and (2) mixing and oscillating the scandium-loaded adsorbent and a desorption agent, filtering, and desorbing scandium ions into a water phase.