210 results about "Scandium" patented technology

The invention provides an improved treatment method for laterite-nickel ore. The improved treatment method comprises the following steps: S1, carrying out acid leaching on the laterite-nickel ore, and then filtering and washing to obtain a leached solution and first leached residues; step S2, the step S2 is selected from any one of a step S2-1, a step S2-2 and a step S2-3; s3, performing first-stage nickel and cobalt precipitation and dense filtration on the aluminum and scandium removed liquid or the iron and aluminum removed liquid by adopting a precipitator to obtain first-stage nickel and cobalt precipitation liquid and a nickel cobalt hydroxide product; and S4, carrying out second-stage nickel-cobalt precipitation on the first-stage nickel-cobalt precipitation solution by adopting a nickel-cobalt precipitation neutralizer and an oxidizing agent to obtain a magnesium sulfate manganese solution and nickel-cobalt-manganese slurry. In the traditional process, ferrous iron is oxidized by using compressed air, so that energy is wasted. According to the method, the manganese-containing substance is adopted as the oxidizing agent, ferrous iron is oxidized into ferric iron, the problems that the ferrous iron is low in oxidation rate under the low pH and compressed air is wasted are solved, and the scandium recovery rate is increased.

The invention belongs to the field of hydrometallurgy, and particularly relates to a method for extracting niobium and / or scandium in a phosphoric acid solution system, which is characterized in that the phosphoric acid solution system containing niobium and / or scandium and an extraction organic phase are subjected to auxiliary extraction under a composite field of ultrasonic-magnetic field to obtain a loaded organic phase. Innovative research shows that extraction is carried out under an ultrasonic-magnetic field composite field, the final physicochemical characteristics of niobium-scandium in a phosphoric acid solution can be adapted accidentally, excellent extraction capacity can be obtained accidentally, and especially excellent scandium-niobium separation selectivity can be obtained under a composite phosphoric acid system containing niobium and scandium.

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 discloses a method for detecting trace chromium element in copper foil based on ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer), which comprises the following steps: soaking a lithium battery copper foil in a mixed solution of concentrated nitric acid and hydrofluoric acid for high-temperature digestion, adding a scandium internal standard solution, and fixing the volume to obtain a solution to be detected; preparing a mixed standard solution of chromium element and scandium element with a plurality of concentration gradients, and establishing a standard curve through ICP-OES; and determining the content of the chromium element in the to-be-detected solution according to the standard curve. The lithium battery copper foil is digested through a mixed acid system, concentrated nitric acid provides an acid environment and an oxidation effect, hydrofluoric acid promotes dissolution, it is ensured that the copper foil is completely dissolved, and the digestion efficiency is improved; a scandium internal standard method is introduced, a dynamic background correction mode of ICP-OES is adopted, a scandium internal standard element can correct signal fluctuation in a sample introduction process, dual guarantee is formed by the scandium internal standard element and dynamic background correction, interference of a copper matrix on a Cr spectral line is specifically eliminated, and the trace chromium element detection precision is remarkably improved.

The invention relates to the technical field of hydrometallurgy production, and particularly discloses a method for synergistically extracting gallium and scandium by coupling titanium white waste acid with vanadium extraction converter sludge, which comprises the following steps: mixing titanium white waste acid and vanadium extraction converter sludge in proportion, stirring and leaching to obtain a leaching solution; adding an extraction agent and a diluent into the leaching solution for extraction, and washing to obtain a gallium and scandium loaded organic phase; a first stripping agent is added into the loaded organic phase of gallium and scandium for stripping treatment, and a gallium stripping solution and a loaded organic phase of scandium are obtained; sequentially carrying out alkali precipitation, alkali dissolution and electrolytic treatment on the gallium reverse extraction solution to obtain crude gallium; a second stripping agent is added into the scandium-loaded organic phase for stripping treatment, and a scandium precipitation solution and an organic phase solution are obtained; and the scandium precipitation solution is filtered, washed and subjected to acid dissolution, and a scandium-containing solution is obtained. According to the method, the titanium white waste acid is effectively recycled, rare and precious metals in the vanadium extraction converter sludge are efficiently and synergistically extracted, and the method has a relatively good popularization prospect.

Disclosed in the present disclosure is a method for selectively leaching scandium from red mud. The red mud contains scandium, and the method comprises: using an inorganic acid solution to pretreat red mud to obtain pretreated red mud slurry; and using a leaching agent to carry out selective leaching on the pretreated red mud slurry to obtain leached slurry, the leaching agent containing organic acid and metal inorganic salt, and the mass ratio of the organic acid to the metal inorganic salt being 0.00015-0.0500.

The invention belongs to the field of metallurgy, and particularly relates to a method for comprehensively recovering iron, vanadium, titanium, scandium and gallium through cooperation of vanadium titano-magnetite and red mud, which comprises the following steps: a) mixing vanadium titano-magnetite concentrate powder and red mud powder, roasting, leaching in water, and carrying out solid-liquid separation to obtain leached residues and leached liquid; b) mixing the leachate with a precipitant to precipitate vanadium, and carrying out solid-liquid separation to obtain vanadium-rich slag and vanadium-precipitated clear liquid; dissolving the vanadium-rich slag in a sulfuric acid solution, mixing the vanadium-rich slag with ammonium salt to react, carrying out solid-liquid separation, and roasting the obtained solid product ammonium polyvanadate to obtain V2O5; resin is used for adsorbing and desorbing gallium ions in the vanadium precipitation clear liquid, the pH of desorption liquid is adjusted to be alkaline, then electrolysis is conducted, and crude gallium is obtained; c) washing and drying the leaching residues to prepare pellets; after the pellets are pre-reduced, a carbonaceous reducing agent is mixed, melt separation treatment is carried out, and scandium-containing high-titanium slag and molten iron are obtained; and Ti and Sc in the scandium-containing high titanium slag are recycled. The method has the advantages of simple process, cleanness, high efficiency and the like.

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.

This powder for sintering contains: a primary powder composed of aluminum or an aluminum alloy; and an oxide of at least one rare earth metal element selected from scandium, yttrium, and lanthanoid elements. This powder (1) for sintering is composed of a mixed powder having: particles (2) of a primary powder composed of aluminum or an aluminum alloy; and additive particles (3) composed of an oxide of at least one rare earth metal element selected from scandium, yttrium, and lanthanoid elements, wherein at least some of the additive particles (3) may adhere to the surface of the particles (2) of the primary powder.

The invention discloses a manufacturing process of multifunctional stainless steel, belongs to the technical field of stainless steel manufacturing, and aims to solve the problems that an existing nano reinforced phase is easy to agglomerate and difficult to uniformly disperse in molten steel, and the performance improvement effect of a material is influenced. By introducing the rare earth-intermetallic compound composite additive, rare earth elements yttrium and scandium can effectively refine grains, purify grain boundaries and improve the strength, toughness and corrosion resistance of the material, nickel trialuminide and a steel matrix are well combined, the dispersion strengthening effect is achieved, and meanwhile the high-temperature performance and thermal conductivity of the material are improved; vanadium and niobium elements are added to form fine carbides, the material is further strengthened, the various elements and the additive have a synergistic effect, parameters of all steps of the preparation process are clear, required equipment can be realized by properly modifying existing metal material processing equipment, the process stability is good, the production efficiency is high, and the production cost is low. The method is suitable for large-scale industrial production.

The present invention discloses a phase change junction film, a phase change memory and a preparation method thereof. The phase change junction film comprises a structural phase change layer and a structural stabilization layer alternately stacked; wherein the structural phase change layer is a cubic phase M x Sb2Te3 layer, the structural stabilizing layer is a hexagonal Ti y Te 1‑y layer, M is one of scandium and yttrium. The present invention is based on the cubic phase of M x Sb2Te3 structure phase change layer and hexagonal Ti y Te 1‑y The phase-shifting heterojunction film, formed by alternating stacking of structurally stable layers, offers faster operating speeds, lower operating power consumption, and improved fatigue cycle life. It also possesses the performance advantages common to heterojunction materials, namely, extremely low resistance drift and resistance fluctuation under weaker atomic diffusion conditions.

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.

Process for producing a layer on a substrate by metal-organic vapor phase epitaxy, which comprises at least one compound of the formula M 1 a SC 1-a Containing or consisting of N, where M 1 is selected from Al or Ga or In and 0.01 ≤ 1-a ≤ 0.295, characterized in that a precursor containing scandium is used with a molar flow (ṅ) of at least 10 -6 mol / min into a reaction chamber (1) for metal-organic vapor phase epitaxy, in which the precursor is present in a bubbler (2) whose temperature is between 120°C and 200°C, wherein the precursor contains or consists of a cyclopentadiene, and the cyclopentadiene contains scandium.

The invention discloses a rare earth doped iron-cobalt-based soft magnetic thin film material as well as a preparation method and application thereof. The chemical formula of the components of the rare earth doped iron-cobalt-based soft magnetic thin film material is (Re2Co17) x (Fe0. 65Co0. 35) 1-x, in the formula, Re is at least one of lanthanide elements, scandium and yttrium, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 And x is less than or equal to 0.2. The preparation method of the rare earth doped iron-cobalt-based soft magnetic thin film material comprises the following steps: carrying out double-target magnetron sputtering by adopting a Re2Co17 target material and a Fe < 0.65 > Co < 0.35 > target material, and then carrying out heat treatment. The rare earth doped iron-cobalt-based soft magnetic thin film material has the advantages of high cut-off frequency, high resistivity, small magnetic loss and the like, has excellent high-frequency soft magnetic performance and static magnetic performance, is suitable for being applied to a high-frequency working environment, is simple in preparation process and low in production cost, and is suitable for large-scale industrial production and application.

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 invention belongs to the technical field of nickel and cobalt wet refining, and particularly discloses a method for separating and recycling scandium from impurity P204 organic matter extracted from a scandium-containing nickel and cobalt material, the P204 organic matter after iron washing is mixed with a sodium hydroxide solution with the concentration of 1-1.2 mol / L and the phase ratio O / A of 1: (1-1.2), P204 saponification is completed in the mixing process, meanwhile, trace scandium loaded in the P204 organic matter can be reversely extracted, and the scandium content in the P204 organic matter can be recycled. Partial scandium in the saponification strip liquor is hydrolyzed into precipitates, and partial scandium is dissolved in the precipitates; after saponification, organic acidification is conducted till the saponification rate is 65% and then returns to an original production system, saponification strip liquor is heated to 95 DEG C, acetic acid is added for scandium precipitation, the addition amount of acetic acid is 1.0-1.2 times of the theoretical scandium precipitation amount, obtained precipitation residues are scandium acetate residues, sodium hydroxide is supplemented into the liquid obtained after precipitation, and then saponification circulation is conducted; the method is characterized in that a saponification mode of an original process is changed, saponification strip liquor is separated, scandium is precipitated, a scandium precipitation reagent has no influence on an original production system, sodium hydroxide is supplemented into liquor after scandium precipitation, then the liquor returns to the system for reuse, no three wastes are generated in the scandium recovery process, and the method is a clean scandium recovery process method.

The oxide semiconductor film has crystallinity, the oxide semiconductor film contains indium (In) and a first metal element (M1) selected from the group consisting of aluminum (Al), gallium (Ga), yttrium (Y), scandium (Sc) and lanthanide elements, and the crystal structure of the oxide semiconductor film is a bixbyite-type structure. In a diffraction pattern of the oxide semiconductor film obtained by out-of-plane XRD measurement using Cu-K alpha rays, at least a first peak of a (222) plane and a second peak of a (440) plane are observed, and the ratio of the intensity of the first peak to the intensity of the second peak is 125 or less.

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.

The invention discloses a short-process method for preparing a scandium-rich material from sulfuric acid process titanium dioxide waste acid, and belongs to the field of valuable resource recovery. The method comprises the following steps: firstly filtering waste acid suspended matters, and separating and recovering sulfuric acid through electrodialysis to obtain a low-salinity sulfuric acid solution and residual acid; carrying out reduction and freezing crystallization on the residual acid to remove iron, and precipitating scandium ions by using a precipitant to obtain a primary wet scandium-rich material; dissolving soluble components in the wet material by using alkali liquor, filtering, dissolving vanadium oxide and chromium by using a recycled sulfuric acid solution, and precipitating scandium ions again to obtain a scandium-rich material with high scandium content. The method for preparing the scandium-rich material from the sulfuric acid process titanium dioxide waste acid through the short process is easy and convenient to operate, short in process, high in efficiency, low in cost and good in environmental protection benefit, scandium in the sulfuric acid process titanium dioxide waste acid can be efficiently recycled, industrial production is easy, resource utilization of the scandium element in the sulfuric acid process titanium dioxide waste acid is achieved, and remarkable economic and environmental benefits are achieved.

The invention relates to the field of metallurgy, in particular to a non-heat-treatable wrought aluminum alloy based on an aluminum-magnesium-scandium system, which can be used as a material for structural elements (including welded structures). The aluminum-based alloy incapable of heat treatment deformation comprises the following components in percentage by weight: 3.0 to 5.2 percent of magnesium, 0.15 to 1.0 percent of manganese, 0.01 to 0.045 percent of scandium, 0.03 to 0.14 percent of zirconium, 0.025 to 0.18 percent of silicon, 0.01 to 0.05 percent of titanium, optionally added yttrium, at least one element (with the content of 0.01 to 0.55) selected from a group comprising copper and zinc, at least one element (with the content of 0.01 to 0.05) selected from a group comprising boron and carbon, and the balance of aluminum and inevitable impurities. The alloy has the characteristics of high strength, corrosion resistance, high elongation in an annealing state, excellent processability and the like.