54results about "Scandium oxides/hydroxides" patented technology

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.

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 application discloses a kind of red mud gradient depth purification-rare earth-radioactivity synergistic target purification method, by " hierarchical pretreatment and microwave modification→three-stage gradient dealkalization→rare earth-radioactivity synergistic target purification→full quantization recycling" four-stage integrated process, realize red mud harmless and high-value utilization.The three-stage gradient dealkalization uses microwave-CO2-biological synergic system, after dealkalization pH≤8.0, Na2O content<1%;Rare earth-radioactivity purification is extracted by HDES and coupled with multi-ligand magnetic material system, light rare earth recovery rate≥95%, middle heavy / rare earth recovery rate≥90%, U / Th removal rate≥95%;Full quantization recycling realizes red mud total utilization rate≥98.5%, wastewater reuse rate≥95%, every ton of red mud fixed CO2≥0.2 tons.The application is suitable for various high-alkali, containing radioactive and rare earth red mud treatment, with environmental benefits and economic benefits.

The invention provides a treatment method of chlorination process titanium dioxide solid waste residues, and belongs to the technical field of resources and environments. According to the method, the chlorination process titanium dioxide solid waste residues are dissolved and extracted step by step, high-value metal in the solid waste residues is recycled respectively, residual substances are evaporated and crystallized to obtain mixed salt, and zero emission and full resource utilization of the solid waste residues are achieved.

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.

This application belongs to the field of rare earth element recovery technology and discloses a method for recovering scandium oxide from scandium-oxalic acid-containing wastewater. The method involves first mixing a phosphoric acid extractant and a solvent oil to obtain a first mixture. The scandium-oxalic acid-containing wastewater is then filtered. The first mixture is mixed with the filtered scandium-oxalic acid-containing wastewater at a volume ratio of organic phase to aqueous phase of 1:20-30. The mixture is then subjected to countercurrent extraction, stirring, and clarification to obtain a second mixture. Subsequently, the organic phase in the second mixture is back-extracted using an alkaline solution containing ethanol to obtain scandium hydroxide. Scandium hydroxide is then dissolved in hydrochloric acid solution, and finally, scandium is precipitated using oxalic acid solution to obtain scandium oxalate. The scandium oxalate is then calcined at high temperature to obtain scandium oxide. Through the above design, the scandium oxide recovery rate of this application reaches 97.9%, and the scandium oxide recovered by this method has a purity of not less than 99.5%.

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 method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.

The invention relates to a process for producing scandium oxide by comprehensively recovering bauxite. According to the method, scandium compounds in the red mud are activated through bubbling treatment, the pH value of a liquid phase is smaller than or equal to 10.5, after multi-stage filtration, insoluble residues are leached through a sodium carbonate-sodium bicarbonate solution, and a scandium-containing sodium carbonate-sodium bicarbonate solution is obtained; after filtering the obtained solution, mixing a scandium-containing alkaline aluminate solution with a scandium-containing sodium carbonate-sodium bicarbonate solution to prepare a scandium-containing hydrolysis concentrate; carrying out two-stage sulfuric acid leaching on the filtered scandium-containing hydrolysis concentrate; the scandium-containing sulfuric acid solutions obtained after two-stage leaching are mixed, alkali is added to adjust the pH to 4.5-5.5, and scandium sulfate without impurity elements is precipitated; then treating with caustic alkali until the pH is not more than 5.6, and carrying out selective precipitation of scandium; treating scandium sulfate with a sulfuric acid solution to obtain basic scandium sulfate; treating the obtained basic scandium sulfate with oxalic acid to convert the basic scandium sulfate into scandium oxalate; filtering the obtained scandium oxalate precipitate; and calcining scandium oxalate to remove carbon and obtain scandium oxide, wherein the content of Sc2O3 in the calcined product is at least 99.0 mass percent.

For the purpose of reducing contamination of scandium oxide products, the present disclosure provides a method for removing at least one metal contaminant from a scandium (Sc) concentrate. The method is based on contacting the Sc concentrate with an ion exchange resin to obtain a purified Sc eluate or raffinate. The first and second ion exchange resins are strong acid cation resins having sulfonic acid functional groups in the potassium or sodium form. The purified Sc eluate or raffinate can be used to produce a scandium oxide product having reduced amounts of metal ion contaminants.

The invention provides Sc2O3 porous aerogel as well as a preparation method and application thereof. According to the method, ScCl3. 6H2O is selected as a scandium source and is non-toxic, and the reaction activity of the ScCl3. 6H2O is controllable compared with that of organic metal alkoxide. In addition, compared with supercritical drying and freeze drying, the normal-pressure drying method for graded drying is lower in cost and higher in safety, and graded drying can effectively protect the nano structure and reduce cracking and collapse of the sample as much as possible. In addition, the scandium oxide aerogel is synthesized for the first time, and the product is high in porosity, large in specific surface area and good in heat insulation performance and has positive significance in application of aerogel materials in various fields.

The present application relates to the field of adsorption separation technology, and particularly relates to a selective removal agent, a preparation method and application thereof. The selective removal agent contains calcium-scan double-metal layered hydroxide and diatomite, and the mass ratio of diatomite to calcium-scan double-metal layered hydroxide is greater than or equal to 0.14. The chemical formula of the calcium-scan double-metal layered hydroxide is [Ca x Sc(OH) y ]OH, x is 2-3, and y is 6-8. The selective removal agent provided in the present application has good selectivity to heat-stable salts and hydrogen phosphate, the selectivity adsorption ratio of hydrogen phosphate to heat-stable salt anions is greater than 6000, efficient separation of heat-stable salts and hydrogen phosphate can be achieved, the stability is good, the working cycle can be prolonged, and the selective removal agent is suitable for industrial popularization.

The invention discloses a method for extracting scandium from a byproduct FeSO4 # imgabs0 # H2O in a sulfuric acid process titanium dioxide waste acid concentration process, and belongs to the field of valuable resource recovery. The method comprises the following steps: mixing and dissolving FeSO4 # imgabs1 # H2O and water, filtering to obtain a ferrous sulfate solution, freezing, crystallizing and filtering to obtain a scandium-containing solution, and circulating for multiple times to increase the scandium concentration; then ferric iron in the solution is reduced, the pH is adjusted with barium hydroxide, scandium is precipitated, and a mixed solid of barium sulfate and scandium hydroxide is separated out; the method comprises the following steps: dissolving scandium hydroxide with acid, filtering and washing, precipitating scandium with oxalic acid or sodium oxalate, and finally roasting scandium oxalate at high temperature to prepare scandium oxide with Sc2O3 greater than or equal to 99.99% and Sc2O3 / REO greater than or equal to 99.9999%. The method has the advantages of being convenient to operate, simple in technological process, low in production cost and good in environmental protection benefit, industrialization is easy, the scandium element in the sulfuric acid process titanium dioxide waste acid concentration byproduct can be efficiently recycled, and efficient utilization of resources is achieved.

The application belongs to the technical field of scandium separation and purification, and particularly relates to a method for separating and purifying scandium from crude nickel-cobalt hydroxide, which comprises the following steps: using 0.1-0.5 mol / L dilute sulfuric acid to leach the crude nickel-cobalt hydroxide, and filtering to obtain a scandium-containing leaching solution, wherein the ratio of the dilute sulfuric acid to the crude nickel-cobalt hydroxide is (3-5) mL:1 g, and the molar ratio of sulfuric acid to scandium is (3-5):1; using an extractant comprising Cyanex572 and Aliquat336 to treat the scandium-containing leaching solution to obtain a scandium-containing organic phase; using an oxalic acid solution to back-extract the scandium-containing organic phase to obtain scandium oxalate precipitation; and calcining the scandium oxalate precipitation to obtain scandium oxide. The technical scheme adopts a selective leaching process to realize efficient separation of scandium from main metals nickel and cobalt at the front end, has low reagent consumption, a short process, and great cost advantages; a new type of synergistic extraction technology is adopted, which has super-high selectivity and extraction capacity for scandium, the prepared scandium oxide has a purity of greater than or equal to 96%, and the scandium recovery rate is greater than or equal to 89%.

The utility model belongs to the technical field of chemical industry production, and provides a system for recovering hydroxide from oxalic acid waste liquid, which comprises a reaction module, a second reaction module, a third reaction module, a fourth reaction module, a fifth reaction module and a sixth reaction module, wherein the reaction module is used for mixing the oxalic acid waste liquid with an organic solution to obtain an organic phase containing transition metal ions and mixing the organic phase with alkali liquor to obtain a first mixture containing hydroxide precipitate; the separation module is used for separating the hydroxide precipitate from the mixture to obtain a solid; a washing module for obtaining a second mixture by washing the solids with a detergent; and the solid-liquid separation module is used for separating the detergent in the second mixture from the hydroxide precipitate to obtain the hydroxide precipitate. According to the utility model, the washing module is used for washing the hydroxide precipitate separated from the separation module, and the washing agent and the hydroxide precipitate are separated through the solid-liquid separation module after washing, so that impurities on the hydroxide precipitate are removed, and the quality of subsequent production procedures is improved.

The invention discloses a method for extracting scandium impurities in an MHP wet process and producing scandium oxide, which comprises the following steps: by taking pickle liquor in the MHP wet process as a raw material, a composite solvent containing phosphorus and carboxylic acid substances as an extracting agent, dilute sulphuric acid as a washing solution and an oxalic acid solution as a strip liquor, removing iron, extracting, washing and stripping to obtain scandium oxalate, and drying and calcining to obtain scandium oxide. According to the method, the phenomena of three-phase emulsification and interface flocculation caused by abnormal interfacial tension in the scandium extraction process are improved by adding the non-silicon defoaming agent, the extraction stage efficiency is improved, the production efficiency is guaranteed, the occupied area of equipment is reduced, meanwhile, the necessary multi-stage separation and deep purification steps in traditional coarse scandium preparation are omitted, and the economic value is high.

The invention relates to technology for the comprehensive processing of bauxites, specifically red mud, to obtain scandium oxide. The present method includes filtering red mud, reslurrying the red mud cake, sparging the mud slurry, and subjecting same to carbonate-bicarbonate leaching and filtration to obtain a scandium-containing product solution. The obtained solution is mixed with an alkali-aluminate solution to obtain a precipitate which is filtered and releached to obtain a scandium-containing alkali-aluminate solution and an insoluble precipitate. The precipitate is releached to obtain a scandium-containing sodium carbonate-bicarbonate solution. The scandium-containing solutions are mixed to obtain a concentrate from which scandium is extracted by two-stage sulphuric acid leaching to obtain basic scandium sulphate which is then treated with oxalic acid. The obtained scandium oxalate precipitate is filtered and calcined to obtain scandium oxide. The invention makes it possible to achieve high scandium extraction.

The invention discloses a method for recycling high-purity scandium by separating scandium and zirconium in a hydrochloric acid system, and belongs to the technical field of strategic metal separation and purification. Epoxy weak-base anion exchange resin is adopted as an adsorbent, scandium is preferentially adsorbed by utilizing the specific coordination effect of functional groups on the resin and scandium ions, and the scandium is recycled; and efficient separation of scandium and zirconium is realized through selective desorption of an eluent sodium chloride solution. According to the method, high-selectivity separation of the alkalescent epoxy anion exchange resin is utilized, efficient separation of Sc (III) and Zr (IV) is achieved under the weak acid condition, the limitation that a traditional adsorbent is insufficient in selectivity is remarkably broken through, the method has the advantages of being low in operation cost, high in separation efficiency and green in process, a subversive solution is provided for large-scale purification of strategic metal scandium, and the method is suitable for industrial production. The method is of great significance to guarantee the security of national defense and high-tech industrial resources.

This invention relates to the field of hydrometallurgical technology, specifically to a method for recovering scandium oxide from scandium slag, scandium oxide, and its applications. The invention involves acid leaching of scandium slag obtained from MHP (methods for hydrometallurgical processes), followed by an N1923 extraction stage, then a P350 extraction stage, followed by an N235 extraction stage. Finally, a scandium chloride solution is precipitated and calcined to obtain high-purity scandium oxide. This method avoids the alkaline reaction process required for scandium-loaded organic phases. The entire extraction process can be carried out in the extraction tank without filtration, resulting in high automation, excellent continuity, a short process, and significantly reduced acid consumption. Furthermore, this invention uses the amine extractant N1923, which has strong selectivity for scandium. When used as the first extraction stage to separate most impurities, the extraction and back-extraction temperatures are lower than those required by acidic phosphine extractants, preventing aging and deterioration of the organic phase. This significantly reduces the number of back-extraction stages and substantially lowers production costs.

The invention belongs to the technical field of scandium separation and purification, and particularly relates to a method for separating and purifying scandium from crude nickel cobalt hydroxide, which comprises the following steps: using 0.1-0.5 mol / L dilute sulphuric acid to leach crude nickel cobalt hydroxide, filtering to obtain scandium-containing leachate, the ratio of dilute sulphuric acid to crude nickel cobalt hydroxide is (3-5) mL: 1g, and the molar ratio of sulphuric acid to scandium is (3-5): 1; carrying out scandium extraction treatment on the scandium-containing leachate by using an extraction agent comprising Cyanex572 and Aliquat 336 to obtain a scandium-containing organic phase; carrying out reverse extraction on the scandium-containing organic phase by using an oxalic acid solution to obtain scandium oxalate precipitate; and calcining the scandium oxalate precipitate to obtain scandium oxide. According to the technical scheme, the selective leaching process is adopted, efficient separation of scandium and main metal nickel and cobalt is achieved at the front end, reagent consumption is low, the process is short, and the large cost advantage is achieved; a novel synergistic extraction technology is adopted, ultrahigh selectivity and extraction capacity on scandium are achieved, the purity of prepared scandium oxide is larger than or equal to 96%, and the recovery rate of scandium is larger than or equal to 89%.

The utility model discloses a system for preparing metal oxide through nitrate pyrolysis and recycling nitric acid step by step. The system comprises a heating melting tank, an atomization pyrolysis furnace, a first dust collector, a first heat exchanger, a dynamic pyrolysis furnace, a second dust collector, a second heat exchanger and a nitric acid regeneration device. Nitrate is heated and melted to obtain nitrate hot fluid, the nitrate hot fluid is atomized and pyrolyzed at low temperature to obtain a precursor, and then the precursor is fed into a dynamic pyrolyzing furnace for thermal decomposition to obtain metal oxide powder. Condensing the dust-collected gas of the atomization pyrolyzing furnace through a heat exchanger to directly collect a first part of finished product nitric acid; the tail gas of the dynamic pyrolyzing furnace passes through a heat exchanger and then is sent to a nitric acid regeneration device to recover a second part of finished nitric acid. According to the system, the size of the atomization pyrolyzing furnace is obviously reduced, the pyrolyzing temperature is reduced, the heat energy utilization efficiency is improved, and the energy cost is greatly reduced. The treatment capacity of the nitric acid regeneration device is remarkably reduced, and the nitric acid regeneration and recovery cost is reduced, so that energy conservation and emission reduction are realized.

The application discloses a method for separating niobium oxide and scandium oxide from Baiyunebo tailings, which comprises the following steps: normal-pressure acid leaching, precipitating rare earth complex salt by adopting sodium sulfate on the leaching solution, removing iron and titanium in the organic phase by using hydrochloric acid-hydrogen peroxide washing liquid, and obtaining the co-precipitation alkali cake of niobium hydroxide and scandium hydroxide by back-extracting the organic phase by sodium hydroxide, and the alkali cake is reacted with a mixed solution of oxalic acid and ammonia water, so that three products of rare earth sulfate complex salt, niobium oxide and scandium oxide can be obtained.

The invention provides a method for extracting high-purity scandium oxide based on silicon-based tributyl phosphate resin, and belongs to the technical field of purification. The method comprises the following steps: mixing the titanium white waste acid with silicon-based tributyl phosphate resin, adding a pre-prepared acid solution, communicating purified resin and enriched resin with the acid solution, enabling the resin to become poor resin after multiple times of drainage, after one round of adsorption is finished, reversely adding the silicon-based tributyl phosphate resin into an alkali solution, desorbing, and electrolyzing a desorption solution, thereby obtaining the titanium white waste acid. A high-purity scandium oxide compound is obtained; the silicon-based tributyl phosphate resin is added, and a large amount of scandium oxide can be selectively adsorbed by utilizing the high adsorbability of the resin, so that the scandium oxide is separated out, and impurities such as Fe, Si, Ni and Ca are preliminarily removed. The method comprises the following steps: adding an alkaline solution into enrichment resin for desorption to obtain a desorption solution containing high scandium oxide;

The invention provides a method for efficiently separating scandium from tungsten slag and application, and relates to the technical field of waste resourceful treatment. Specifically, dispersion liquid containing tungsten slag, an acid reagent, a reducing agent and organic reagents (an extracting agent, a modifying agent and sulfonated kerosene) is prepared, reaction is carried out in an ultrasonic state, then solid-liquid separation is carried out, and acid leaching slag and a liquid phase containing an organic phase and a water phase are obtained; carrying out washing and reverse extraction on the organic phase, and then separating in a water phase to obtain a scandium hydroxide crude product; preparing the scandium hydroxide crude product into a solution, removing impurities through ion exchange resin, and adding oxalic acid for reaction to obtain scandium oxalate precipitate; and calcining to obtain scandium oxide. The method provided by the invention can effectively solve the defect of long process of extracting scandium from tungsten slag and the technical problem that scandium and iron are difficult to separate, and the obtained scandium oxide product has high purity, good scandium recovery rate and good application prospect.

The present invention relates to a process for treating residues, in particular solid residues, of the alumina refining industry, i.e. for treating red mud, comprising the following steps: - reductive fusion of the red mud or pre-reduction and subsequent treatment, with the production of a scoria enriched in aluminium, titanium and scandium and with a low content of iron; - digestion of said scoria with sulphuric acid, at a concentration of 6 - 18.5M and temperature of 50-250°C, for a duration of 0.5-2h, with the conversion of the aluminium, titanium and scandium oxides into water-soluble sulphates and the obtainment of an aqueous solution of aluminium, titanium and scandium sulphates and a solid residue; - leaching with water of the solid residue obtained from the digestion, with a temperature in the range of 25-75°C, for a duration of 5-30min and with a liquid / solid ratio of from 5 / 1 to 20 / 1, calculated relative to the initial mass of red mud subjected to acid digestion, with a further solubilisation of aluminium, titanium and scandium in said solution and separation of a solid residue; - addition to said solution, after leaching, of ammonium sulphate in an amount equal to 1 -1.5 times the stoichiometric amount relative to the aluminium, with a reaction time of 5-60 minutes, precipitation of aluminium ammonium sulphate and the separation thereof from the residual solution; - purification of said aluminium ammonium sulphate, by means of a plurality of washing cycles with hot water and filtration.

The application discloses a method for recovering scandium and zirconium in scandia-stabilized zirconia ceramics, and belongs to the technical field of ceramic waste resource recovery. The method comprises the following steps: performing alkali leaching pretreatment on scandia-stabilized zirconia ceramic powder to obtain mixed slurry, introducing the mixed slurry into carbon dioxide to perform carbonation selective leaching of scandium, and performing liquid-solid separation to obtain a scandium-containing leaching solution and leaching residue; performing alkali leaching of the leaching residue to extract zirconium, and performing liquid-solid separation to obtain a zirconium-containing leaching solution and tailings. The method realizes separate leaching and extraction of scandium and zirconium in ceramics by performing carbonation after alkali leaching pretreatment to leach scandium, and leaving zirconium in the residue and extracting zirconium components through secondary alkali leaching, so that the recovery rate of scandium and zirconium can be improved, and the product purity can be improved.

Despite the abundance of scandium, its commercial applications continue to be limited by the absence of reliable, secure, stable and long-term production. The subject-matter disclosed herein provides for a method for extracting Rare Earth Elements (REE), scandium and / or Rare-Earth Oxides (REO) from ore and mineral concentrates, the method comprising: providing Rare Earth Elements (REE) and / or scandium bearing feedstock; a high-pressure caustic (HPC) leaching step, comprising leaching the feedstock in an alkali solution at a first temperature for a target period of time and at a given pressure to produce a leachate slurry; extracting a solid residue from the leachate slurry; leaching of the solid residue in a mineral acid to form a primary leach solution; extracting scandium and / or REE from the primary leach solution; and / or precipitating REE remaining in the raffinate to form a mixed REE-carbonate to thereby facilitate the extraction of REO.

The invention provides a spherical nano rare earth oxide and a preparation method thereof. The preparation method comprises the following steps: mixing a first solvent and a second solvent to obtain a mixed solvent; dispersing a rare earth metal salt, a precipitating agent and a dispersing agent in the mixed solvent to obtain a reaction solution; carrying out heating reaction on the reaction liquid; carrying out solid-liquid separation to obtain a spherical nano rare earth oxide precursor; and calcining the spherical nano rare earth oxide precursor to obtain the spherical nano rare earth oxide. According to the preparation method, the solvent is selected, the rare earth metal salt, the precipitant and the dispersing agent are matched in a specific solvent environment, and the spherical nano rare earth oxide with high sphericity degree and uniform and controllable particle size is prepared through a heating reaction. The preparation method provided by the invention is simple, easy to implement and suitable for large-scale production.

The present invention belongs to the technical field of hydrometallurgy, and specifically relates to a method for separating scandium and yttrium from crude nickel cobalt hydroxide, which comprises the following steps: adding water and acid to the crude nickel cobalt hydroxide for dissolution reaction, adding the crude nickel cobalt hydroxide to adjust the pH value, performing solid-liquid separation to obtain an acid solution and an acid leaching residue; removing silicon, performing precision filtration, and performing solvent extraction to obtain a loaded organic phase and a raffinate; washing the loaded organic phase to obtain organic phase I; using a mixed solution of hydrochloric acid and oxalic acid with different gradient concentrations from low to high to sequentially perform preliminary stripping of yttrium, deep stripping of yttrium, and stripping of scandium on the loaded organic phase to obtain a scandium oxalate precipitate, and then performing precipitate washing, drying, and calcination to obtain scandium oxide; performing yttrium precipitation, precipitate washing, and calcination on the third washing solution obtained by stripping yttrium to obtain yttrium oxide. The method of the present invention solves the technical problem that it is difficult to completely separate scandium and yttrium during the solvent extraction of nickel and cobalt, and long-term accumulation is likely to hinder the normal operation of the extraction system.

The application discloses a kind of pre-transition metal oxide nanoparticles and its preparation method and oxygen reduction synthesis hydrogen peroxide application.The active component of the material is pre-transition metal oxide nanoparticles.Preparation method includes: with soluble pre-transition metal salt and ammonium chloride as raw material, dissolving, evaporating to dryness to obtain mixed precursor, then by calcining at different temperatures in tube furnace to obtain pre-transition metal oxide nanoparticles.The pre-transition metal oxide nanoparticles catalyst prepared can be used for oxygen reduction to prepare hydrogen peroxide, with very high hydrogen peroxide selectivity and excellent stability, greatly improving the energy utilization efficiency.The application has the characteristics of low cost, low energy consumption, simple operation, no security risks, etc., and is suitable for large-scale industrial production.