Class / Patent application number | Description | Number of patent applications / Date published |
423210100 | Rare earth metal (At. No. 21, 39, or 57-71) | 63 |
20100003176 | PROCESS FOR PRETREATING ORGANIC EXTRACTANTS AND ITS PRODUCT AND APPLICATION - A process for pretreating organic extractants and its product and application in SX separation of rare earth. The pretreating method is that extractant and rare earth solution are mixed with powder or slurry of alkaline earth metal compound containing magnesium and/or calcium to realize pre-extraction, or the organic extractant are mixed with rare earth carbonate slurry to realize pre-extraction. When rare earth ion in aqueous phase is extracted into organic phase, the exchanged hydrogen ions enter into aqueous phase and dissolve the alkaline earth metal compound or the rare earth carbonate which helps to keep the acidity equilibrium of the system. The obtained organic extractant loaded with rare earth is used for unsaponificated SX separation of rare earth. | 01-07-2010 |
20100129277 | RARE METAL/PLATINUM-GROUP METAL EXTRACTANT AND METHOD FOR EXTRACTING RARE METALS AND PLATINUM-GROUP METALS - The present invention provides a rare metal/platinum-group metal extractant, which has a completely new structure compared with the conventional rare metal/platinum-group metal extractant and which exhibits excellent extraction performance; it also provides a method for extracting rare metals and platinum-group metals using the extractant. The rare metal/platinum-group metal extractants of the present invention is the one to extract rare metals and platinum-group metals by contacting a solution, in which several kinds of rare metals and platinum-group metals are dissolved, with a solution in which a cyclic phenol sulfide of the following Formula (1) is dissolved to make the rare metals and platinum-group metals move into the cyclic phenol sulfide solution. | 05-27-2010 |
20100196229 | SOLUTE PRECIPITATION METHOD AND DEVICE - A precipitator comprises a counter-current circulation between the reacting substances ( | 08-05-2010 |
20100226837 | PRODUCTION OF METAL PRODUCTS DIRECTLY FROM UNDERGROUND ORE DEPOSITS - A process for producing metal compounds directly from underground mineral deposits including the steps of forming a borehole at a site into a mineral deposit containing metal compounds, inserting a slurry-forming device having a nozzle into the borehole adapted to direct pressurized water through the nozzle into the mineral deposit, supplying pressured water through the nozzle into the mineral deposit forming a mineral slurry containing metal compounds, extracting the mineral slurry containing metal compounds through the borehole, leaching the mineral slurry to convert the metal compounds to a soluble form in a leach solution, and removing metals and metal compounds by treating the leach solution with an extraction treatment adapted to remove the metal products. Steps of leaching the mineral slurry and removing metal products are performed at a location remote from the borehole site. Alternatively, the step of removing metal products from mineral slurry may be accomplished by pyrometallurgical processes. | 09-09-2010 |
20110280778 | METHOD OF PRECIPITATION OF METAL IONS - The present invention relates to a method of precipitation of metal ions. Mineral(s), oxide(s), hydroxide(s) of magnesium and/or calcium are adopted as raw materials, and the raw material(s) is processed through at least one step of calcination, slaking, or carbonization to produce aqueous solution(s) of magnesium bicarbonate and/or calcium bicarbonate, and then the solution(s) is used as precipitant(s) to deposit rare earth, such as nickel, cobalt, iron, aluminum, gallium, indium, manganese, cadmium, zirconium, hafnium, strontium, barium, copper and zinc ions. And at least one of metal carbonates, hydroxides or basic carbonates is obtained, or furthermore the obtained products are calcined to produce metal oxides. The invention takes the cheap calcium and/or magnesium minerals or their oxides, hydroxides with low purity as raw materials to instead common precipitants such as ammonium bicarbonate and sodium carbonate etc. The calcium, magnesium, carbon dioxide etc are efficiently and circularly used, and the environment pollution by ammonium-nitrogen wastewater, high concentration salts wastewater is avoided, and both of the discharge of greenhouse gas carbon dioxide and the production cost of metal are decreased. | 11-17-2011 |
20120027651 | METHOD FOR RECOVERY OF RARE EARTHS FROM FLUORESCENT LAMPS - Method of recovery of rare earths from fluorescent lamps. The method comprises six steps. The individual process steps are: Mechanical separation of coarse components. Separation of the halophosphate. Extraction in acids of easily soluble rare-earth fluorescent substances (mainly Y, Eu-oxide) Extraction in acids of rare earth fluorescent substances which dissolve with difficulty (for example rare-earth phosphates) Breakdown of the remaining components which contain rare earths (for example rare-earth-aluminates) Final treatment. | 02-02-2012 |
20120070351 | METHOD FOR RECOVERING RARE-EARTH ELEMENTS FROM A SOLID MIXTURE CONTAINING A HALOPHOSPHATE AND A COMPOUND OF ONE OR MORE RARE-EARTH ELEMENTS - A method is described for recovering rare earth elements from a solid mixture including a halophosphate and at least one compound of one or more rare earth elements. The method includes: (a) acid etching the mixture; (b) adding a base to bring the pH back up to a value of at least 1.5; (c) etching the solid from step (b) with a solution of soda or potash; (d) acid etching the solid from step (c) until a pH of less than 7 is obtained, resulting in a solid phase and a liquid phase including at least one rare earth salt, and separating the solid phase from the liquid phase. | 03-22-2012 |
20120156116 | Process For Metal Recovery From Catalyst Waste - A method for recovering rare earth metals from zeolite-containing waste FCC catalysts comprises an acid leaching step to remove the rare earth metals from the catalyst to form a leachate containing dissolved rare earth metals and separating the rare earth metals from the leachate such as by precipitation. | 06-21-2012 |
20120207656 | System and Method for Recovery of Scandium Values From Scandium-Containing Ores - A method for extracting scandium values from scandium-containing ores is provided. The method comprises (a) providing ( | 08-16-2012 |
20120219477 | METHOD FOR EXTRACTING RARE EARTH MATERIAL FROM MONAZITE - A method for extracting rare earth elements from monazite is disclosed. The method includes milling a mixture of monazite including phosphates and rare earth elements and sodium hydroxides inside a mill containing a plurality of balls to form powder by colliding the mixture into balls with each other, converting the mixture into rare earth hydroxides and sodium phosphates through the reaction occurring in the process of repeated collision, and extracting rare earth elements from the powder. | 08-30-2012 |
20130108526 | METHOD FOR MATERIALS RECOVERY FROM CATALYSTS COMPRISING IRON, CERIUM, MOLYBDENUM, AND POTASSIUM | 05-02-2013 |
20130156660 | RARE EARTH RECOVERY FROM PHOSPHOR - A method is described to produce high purity rare earth oxides of the elements La, Ce, Tb, Eu and Y from phosphor, such as waste phosphor powders originating in various consumer products. One approach involves leaching the powder in two stages and converting to two groups of relatively high purity mixed rare earth oxides. The first group containing Eu and Y is initially separated by solvent extraction. Once separated, Eu is purified using Zn reduction with custom apparatus. Y is purified by running another solvent extraction process using tricaprylmethylammonium chloride. Ce is separated from the second group of oxides, containing La, Ce and Tb by using solvent extraction. Subsequently, La and Tb are separated from each other and converted to pure oxides by using solvent extraction processes. A one-stage leaching process, wherein all rare earths get leached into the solution and subsequently processed, is also described. | 06-20-2013 |
20130171047 | METHOD FOR RECYCLING OF RARE EARTH AND ZIRCONIUM OXIDE MATERIALS - A method is presented for recovery, in reusable form, of rare earth minerals and zirconia from waste materials containing them. The method includes: mixing an ammonium sulfate powder and a powder containing the oxide waste material; heating the mixture to decompose the waste into a residue; dissolving the residue in water; separating rare earth constituents from the solution; and subsequently using the separated rare earth constituent (salt or solution) as a raw material. Moreover, the reactants used in the recovery may be recovered by appropriate precipitation and concentration operations. | 07-04-2013 |
20130189170 | METHOD FOR RECOVERING YTTRIA FROM CASTING WASTE AND SLURRY - The disclosure relates generally to methods for yttrium recovery from articles. More specifically, the disclosure relates to methods for recovering yttrium from casting waste components and slurries. | 07-25-2013 |
20130309150 | RARE EARTH RECOVERY FROM PHOSPHOR - A method is described to produce high purity rare earth oxides of the elements La, Ce, Tb, Eu and Y from phosphor, such as waste phosphor powders originating in various consumer products. One approach involves leaching the powder in two stages and converting to two groups of relatively high purity mixed rare earth oxides. The first group containing Eu and Y is initially separated by solvent extraction. Once separated, Eu is purified using Zn reduction with custom apparatus. Y is purified by running another solvent extraction process using tricaprylmethylammonium chloride. Ce is separated from the second group of oxides, containing La, Ce and Tb by using solvent extraction. Subsequently, La and Tb are separated from each other and converted to pure oxides by using solvent extraction processes. A one-stage leaching process, wherein all rare earths get leached into the solution and subsequently processed, is also described. | 11-21-2013 |
20130336856 | SYSTEM AND METHOD FOR RARE EARTHS EXTRACTION - It is described a method for recovering rare earth elements from low grade ores including a first metal selected group containing at least one of iron and aluminum and a second metal selected from the group consisting of at least of the rare earth elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium and scandium), the method comprising the steps of: (i) contacting the ore with sulfuric acid to obtain sulfates of the first group of metals, (ii) subjecting the mixture to high temperatures in order to convert the first group of sulfates into phosphates or other stable species and the second group into sulfates, (iii) adding water to the cool mixture, selectively dissolving the rare earth elements and (iv) subjecting the rare earth solution to a purification process. | 12-19-2013 |
20140023571 | METHOD OF RECOVERING RARE EARTHS FROM A SOLID MIXTURE CONTAINING A HALOPHOSPHATE AND A RARE EARTH COMPOUND AND SOLID MIXTURES SUITABLE FOR THIS METHOD - An acid treatment, in a liquid medium, of a solid containing a halophosphate and a rare earth compound is described. Further described, is the addition of a base to the medium obtained previously and separation of a solid phase from a liquid phase; mixing and calcination of the solid obtained previously with an alkaline solid compound; redispersing the calcined product in water, separation of the solid product from the suspension obtained in the preceding step; dispersing this solid in water and acidification of the dispersion and separation of the solid from this dispersion. | 01-23-2014 |
20140072486 | FLUORESCENT LAMP PHOSPHOR RECYCLING - A method is provided for recovering phosphor materials from fluorescent lamps. Particles created from the lamps are washed by mixing with water and carboxylic (e.g., acetic) acid while controlling the temperature. The carboxylic acid reacts with basing cement, particularly calcium carbonate, without significant reaction with the phosphors. After this reaction, the phosphors can be removed and e.g., reused in the production of fluorescent lamps. | 03-13-2014 |
20140154155 | REFINING METHODS AND AGENTS FOR RARE EARTH PRODUCTION - Hydrometallurgical systems, methods, and compositions are described in which organic amine-based lixiviants are utilized in the selective recovery of rare earth elements. The lixiviant can be regenerated in situ, permitting the organic amine to be used in substoichiometric amounts. | 06-05-2014 |
20140186239 | METHOD FOR RECOVERING RARE EARTH ELEMENT - An object of the present invention is to provide a method for recovering a rare earth element from a workpiece containing at least a rare earth element and an iron group element, which can be put into practical use as a low-cost, simple recycling system. The method of the present invention as a means for resolution is characterized by including at least a step of separating a rare earth element in the form of an oxide from an iron group element by subjecting a workpiece to an oxidation treatment, then turning the treatment environment into an environment where carbon is present, and subjecting the oxidation-treated workpiece to a heat treatment at a temperature of 1150° C. or more. | 07-03-2014 |
20140314639 | METHOD FOR RECOVERING SCANDIUM FROM INTERMEDIATE PRODUCTS FORMED IN THE HYDROMETALLURGICAL PROCESSING OF LATERITE ORES - The invention provides a method for recovering scandium from scandium-containing intermediate products, formed during hydrometallurgical processing of scandium-containing feed materials, including: (a) leaching of the scandium-containing intermediate products with a suitable acid at a controlled pH selected to maximize scandium extraction and minimize the co-extraction of impurities, (b) solid/liquid separation, to obtain a scandium-containing leach solution; (c) selective precipitation of the scandium at a controlled pH from the scandium-containing leach solution using a suitable base, (d) solid/liquid separation, to obtain an upgraded scandium concentrate and a barren solution for return to the hydrometallurgical process. A further upgraded scandium concentrate can be obtained by (e) alkaline leaching of the upgraded scandium concentrate for additional removal of impurities, and (f) solid/liquid separation to obtain a further upgraded scandium concentrate and impurities-containing base solution. | 10-23-2014 |
20140322107 | METHOD FOR RECOVERING RARE EARTH ELEMENT - The object of the present invention is to provide a method for recovering a rare earth element, which is capable of efficiently recovering a rare earth element with high recovery rate without using any expensive chemicals, solvents or the like. In the present invention, a water-soluble salt other than sulfate ions is allowed to coexist with an aqueous solution that contains a rare earth element, and then an alkali metal sulfate is added to the aqueous solution, thereby producing a precipitate of a double sulfate of the rare earth element. | 10-30-2014 |
20140356258 | Method for Separating and Recovering Rare-Earth Elements - A method for separating and recovering a plurality of rare-earth elements, the method including a step of introducing, into a liquid, a mixture containing a rare-earth oxychloride and a rare-earth chloride, the rare-earth oxychloride constituted from a rare-earth element different from a rare-earth element constituting the rare-earth chloride, thereby obtaining an insoluble matter containing the rare-earth oxychloride and a liquid in which the rare-earth chloride is dissolved, a step of recovering the rare-earth oxychloride from the insoluble matter, and a step of recovering the rare-earth chloride from the liquid in which the rare-earth chloride is dissolved. | 12-04-2014 |
20140369904 | PROCESSES FOR PREPARING ALUMINA AND VARIOUS OTHER PRODUCTS - There are provided processes for preparing alumina. These processes can comprise leaching an aluminum-containing material with HCl so as to obtain a leachate comprising aluminum ions and a solid, and separating said solid from said leachate; reacting said leachate with HCl so as to obtain a liquid and a precipitate comprising said aluminum ions in the form of AlCl | 12-18-2014 |
20150086449 | METHOD OF RECOVERING RARE-EARTH ELEMENTS - Provided is a method of recovering rare-earth elements by which rare-earth elements can be recovered efficiently from a bauxite residue serving as a raw material and containing the rare-earth elements. Specifically provided is a method of recovering rare-earth elements from a raw material, the raw material being a bauxite residue produced as a by-product in a Bayer process, the method including: using a bauxite residue having a specific surface area of 35 m | 03-26-2015 |
20150292059 | Method and System for Separating Rare Earth Elements - An objective of the invention is to provide a method and system for separating a particular rare earth element from a rare earth magnet at a high separation ratio and by a simple process. There is provided a rare earth separation method for separating a first and a second groups of rare earth elements contained in a magnet, the method including: a starting powder preparation step from the magnet; a magnet component oxidation heat treatment step; a rare earth oxide separation step from the magnet components oxide powder; a powder size optimization step; a chlorinating agent mixing step; a chlorination/oxychlorination heat treatment step of forming a “first group rare earth chlorides”/“second group rare earth oxychlorides” mixture; a selective dissolution step of selectively dissolving the first group rare earth chlorides in the solvent and leaving the second group rare earth oxychlorides undissolved in solid phase form; and a solid-liquid separation step. | 10-15-2015 |
20150292060 | METHOD FOR ISOLATING RARE EARTHS AND/OR ADJACENT METAL ELEMENT(S) CONTAINED IN THE MAGNETIC PHASE OF PERMANENT MAGNETS - A isolating method including: (i) arranging material forming a magnetic phase as a demagnetised powder, having an average particle size no larger than 700 μm without particles not making up the magnetic phase; (ii) dissolving the powder of step (i) in an acid medium with at least one oxidising agent in the presence of hydroxide ions, at a pH strictly lower than 7; (iii) precipitating the adjacent metal element(s) in the hydroxide state by adding to the solution obtained at the end of step (ii) an effective amount of hydroxylated base; (iv) isolating the metal hydroxide precipitate formed at the end of step (iii) and, when necessary, recovering same; (v) precipitating the rare earth elements in the oxalate state in the solution without adjacent metal element(s) and obtained at the end of step (iv); and (vi) recovering the rare earths in the precipitated state of rare earth oxalate. | 10-15-2015 |
20150307958 | MONAZITE BALLAST SEPARATION AND RECOVERY METHOD - The invention relates to a separation and recovery method for radioactive waste slag and specifically relates to a separation and recovery method for monazite slag. The separation and recovery method comprises the following steps: acid leaching, pressure filtration, water washing, extraction of valuable components and treatment of filtration slag. The separation and recovery method provided by the invention performs low-acid and low-temperature leaching on monazite slag, so that a liquid phase and a solid phase are easy to separate; after an ore dressing process is adopted for performing ore dressing and alkali decomposition on secondary slag, closed-loop circulation and recovery of uranium, thorium and rare earth is realized; and simultaneously, extraction raffinate waste acid is recycled, so that the emission of waste water is reduced, the consumption of sulfuric acid and fresh water and the treatment cost of the waste water are reduced, the production cost is reduced, the recovery rate of the valuable elements, namely the uranium, the thorium and the rare earth is more than 97%, and the whole process has no emission of the radioactive waste water and waste slag. | 10-29-2015 |
20150329940 | SYSTEM AND PROCESS FOR SELECTIVE RARE EARTH EXTRACTION WITH SULPHUR RECOVERY - The application relates to a process for rare earth extraction and thorium removal from monazite or bastnasite bearing ores or ore beneficiation and industrial waste containing a variable amount of rare earth elements as oxides, phosphates, carbonates or sulfates, comprising (i) controlled mixture between sulfuric acid and the material containing rare earth and (ii) water leaching under controlled conditions. | 11-19-2015 |
20150344991 | METHOD FOR RECOVERING RARE EARTH ELEMENT - An object of the present invention is to provide a method for recovering a rare earth element from a workpiece containing at least a rare earth element and an iron group element, which can be put into practical use as a low-cost, simple recycling system. The method for recovering a rare earth element from a workpiece containing at least a rare earth element and an iron group element of the present invention as a means for resolution is characterized by including at least a step of separating a rare earth element in the form of an oxide from an iron group element by subjecting a workpiece to an oxidation treatment, then turning the treatment environment into an environment where carbon black is present, and subjecting the oxidation-treated workpiece to a heat treatment at a temperature of 1000° C. or more in an inert gas atmosphere or in vacuum. | 12-03-2015 |
20150354026 | EXTRACTION OF METALS FROM METALLIC COMPOUNDS - Methods for the extraction of metals such as rare earth metals and thorium from metal compounds and solutions. The methods may include the selective precipitation of rare earth elements from pregnant liquor solutions as rare earth oxalates. The rare earth oxalates are converted to rare earth carbonates in a metathesis reaction before being digested in an acid and treated for the extraction of thorium. A two-step extraction method may be applied to precipitate thorium as thorium hydroxide under controlled pH conditions such that pure thorium precipitate is recovered from a first step and a thorium-free rare earth solution is recovered at the subsequent step. The resulting rare earth solutions are of extremely high purity and may be processed directly in a solvent extraction circuit for the separation of rare earth elements, or may be processed for the direct production of a 99.9% bulk rare earth hydroxide/oxide concentrate. | 12-10-2015 |
20150361526 | METHOD FOR RECOVERING HEAVY RARE EARTH ELEMENT - An object of the present invention is to provide a method for recovering a heavy rare earth element from a workpiece containing at least a heavy rare earth element and an iron group element, which can be put into practical use as a low-cost, simple recycling system. The method for recovering a heavy rare earth element from a workpiece containing at least a heavy rare earth element and an iron group element of the present invention as a means for resolution is characterized by including at least the following step: a workpiece is subjected to an oxidation treatment or mixed with an oxidation-treated R—Fe—B based magnet alloy, and then subjected to a heat treatment in the presence of carbon at a temperature of 1000° C. or more, thereby separating a heavy rare earth element in the form of an oxide from an iron group element. | 12-17-2015 |
20150368755 | METHOD FOR PRODUCING A SOLID SCANDIUM-CONTAINING MATERIAL OF ENHANCED SCANDIUM CONTENT - A method for producing a solid scandium-containing material comprises providing an aqueous solution containing carbonate ions, carbamate ions, hydrogen carbonate (HCO | 12-24-2015 |
20160010178 | ADSORBENT FOR RARE EARTH ELEMENT AND METHOD FOR RECOVERING RARE EARTH ELEMENT | 01-14-2016 |
20160032421 | PROCESSES FOR TREATING FLY ASHES - There are provided processes for treating fly ash. For example, the processes can comprise leaching fly ash with HCl so as to obtain a leachate comprising aluminum ions and a solid, and separating the solid from the leachate; reacting the leachate with HCl so as to obtain a liquid and a precipitate comprising the aluminum ions in the form of AlCl | 02-04-2016 |
20160032423 | A method for concentrating rare-earth metals in phosphogypsum - The present invention relates to a method for producing rare-earth metals (REM) compounds by complex processing of apatite, in particularly to a method for concentrating rare-earth metals (REM) in phosphogypsum, where to a process of decomposition of the REM containing raw phosphate material with sulphuric acid, a sodium salt in the amount of 0.25-5.0 kg in terms of Na | 02-04-2016 |
20160047015 | A method for extracting rare-earth metals - The present invention relates to a method for complex processing of apatite concentrate resulting in producing concentrate of rare earth metals (REM) and plaster from phosphogypsum, a waste of sulphuric acid technology for producing phosphoric acid from apatite. The method comprises leaching of REM into solution by recrystallization of hemihydrate or anhydrite of calcium sulphate into dihydrate of calcium sulphate with a soluble calcium salt at concentrations of 0.075-3.75 M (in terms of Ca | 02-18-2016 |
20160068929 | EXTRACTION OF RARE EARTH METALS FROM NdFeB USING SELECTIVE SULFATION ROASTING - Sulfuric acid baking allows for the selective extraction of rare earth metals from scrap Nd | 03-10-2016 |
20160153067 | PROCESSES FOR PREPARING TITANIUM OXIDE AND VARIOUS OTHER PRODUCTS | 06-02-2016 |
20160153069 | METHOD FOR TREATING SOLUTION CONTAINING RARE EARTH | 06-02-2016 |
20160177419 | METHOD FOR SEPARATION OF RARE EARTH ION | 06-23-2016 |
20160376683 | MONAZITE AND APATITE PARAGENETIC ORE ENRICHMENT METHOD - The present invention discloses a monazite and apatite paragenetic ore enrichment method. High-grade and high-recovery-rate monazite concentrate can be obtained by adopting the method through steps of ore grinding, floatation, magnetic separation and low-acid advanced leaching treatment and re-floatation. In this process, the applicable range of ore pulp temperature is wide, the process flow is short, the ore dressing conditions are mild, the energy consumption is small, the used diluted acid can be cyclically regenerated and used, the pollution is small, the environmental stress is small and the recovery rate of low-grade monazite and apatite paragenetic ores can be obviously improved. | 12-29-2016 |
423210500 | Ion exchanging or liquid-liquid extracting | 21 |
20120014852 | Membranes and Reactors for CO2 Separation - The present disclosure relates to a system for carbon dioxide separation. The system includes a conducting membrane having two phases. The first phase is a solid oxide porous substrate. The second phase is molten carbonate. The second phase is positioned within the solid oxide porous substrate of the first phase. The system also includes a H | 01-19-2012 |
20140044624 | DETRITIATION DEVICE AND METHOD - The invention relates to a detritiation device comprising i) a furnace ( | 02-13-2014 |
20140154158 | APPARATUS AND METHOD FOR REMOVING SULFER DIOXIDE FROM FLUE GASES - An apparatus and method for removing sulfur dioxide from a flue gas is described. The apparatus has sequentially operable scrubbing zone and regeneration zone, which communicate with one another via a molten eutectic mixture of lithium, sodium and potassium carbonates. In the scrubbing zone, an ingress flue gas interacts with the molten carbonates, resulting in chemical absorbance of the sulfur dioxide and in discharge of reaction gases. In the regeneration zone, ether a chemical or electrochemical melt regeneration takes place resulting in formation of sulfur-containing vapor which is cooled down for converting the sulfur-containing vapor into a liquid and solid phase for a further collection and utilization. | 06-05-2014 |
20090162267 | Method for Recovery of Rare Earths from Fluorescent Lamps - Method for recovery of rare earths from fluorescent lamps. The method comprises six steps. The individual process steps are: Mechanical separation of coarse components. Separation of the halophosphate. Extraction in acids of easily soluble rare-earth fluorescent substances (mainly Y, Eu-oxide) Extraction in acids of rare-earth fluorescent substances which dissolve with difficulty (for example rare-earth phosphates) Breakdown of the remaining components which contain rare earths (for example rare-earth-aluminates) Final treatment. | 06-25-2009 |
20110206580 | RARE EARTH RECOVERY FROM FLUORESCENT MATERIAL AND ASSOCIATED METHOD - A method of recovering a rare earth constituent from a phosphor is presented. The method can include a number of steps (a) to (d). In step (a), the phosphor is fired with an alkali material under conditions sufficient to decompose the phosphor into a mixture of oxides. A residue containing rare earth oxides is extracted from the mixture in step (b). In step (c), the residue is treated to obtain a solution, which comprises rare earth constituents in salt form. Rare earth constituents are separated from the solution in step (d). | 08-25-2011 |
20110274597 | USE OF Mg(HCO3)2 AND/OR Ca(HCO3)2 AQUEOUS SOLUTION IN METAL EXTRACTIVE SEPARATION AND PURIFICATION - The application of aqueous solution of magnesium bicarbonate and/or calcium bicarbonate in the process of extraction separation and purification of metals is disclosed, wherein the aqueous solution of magnesium bicarbonate and/or calcium bicarbonate is used as an acidity balancing agent, in order to adjust the balancing pH value of the extraction separation process which uses an acidic organic extractant, improve the extraction capacity of organic phase, and increase the concentration of metal ions in the loaded organic phase. | 11-10-2011 |
20120087849 | METHOD FOR RECOVERING LANTHANUM FROM ZEOLITES CONTAINING LANTHANUM - The present invention relates to a method for recovering lanthanum from zeolite compounds containing lanthanum which is characterized in that (A) an aqueous acid is added to one or more zeolite compounds containing lanthanum so that there is a pH value of lower than or equal to 3, and (B) dissolved lanthanum is separated out. The method according to the invention makes it possible when recovering lanthanum from zeolites containing lanthanum to dispense with the use of corrosive gases such as chlorine and hydrogen chloride and with corrosive oxidative molten metals, and thus simplifies the apparatus requirements and the process. The present invention makes it possible to recover lanthanum from zeolite compounds containing lanthanum which occur as catalyst waste from large-scale chemical material conversion processes, such as, for example, the Fluid Catalytic Cracking method (FCC method), the hydrocracking method or the Claus process. | 04-12-2012 |
20120100049 | Rare Earth Elements Separation Using Phosphorus Based Adsorbent - The present invention relates to methods for the separation of rare earth elements from aqueous solutions and, more particularly, to the separation of lanthanides (e.g., neodymium(III)) from aqueous solutions using an organo phosphorus functionalized adsorbent. | 04-26-2012 |
20120114538 | METHOD FOR EXTRACTING RARE EARTH ELEMENTS FROM PHOSPHOGYPSUM - The present invention relates to methods for recovering rare earth elements, in particular, from phosphogypsum. | 05-10-2012 |
20120328493 | METHOD FOR EXTRACTING AND SEPARATING LIGHT RARE EARTH ELEMENT - A target light rare earth element is separated from an aqueous solution containing two or more of La, Ce, Pr and Nd by contacting an organic phase containing an extractant with the aqueous solution in a counter-current flow multistage mixer-settler while adding an alkaline solution thereto, and contacting the organic phase with an acid aqueous solution for back-extracting the target element. The extractant is a dialkyl diglycol amic acid having formula: R | 12-27-2012 |
20130287653 | Recovery of Rare Earth Elements and Compounds from Coal Ash - Rare earth elements are recovered from coal ash. The coal ash with rare earth elements can be treated with a mineral acid to form an aqueous mineral acid solution. The aqueous mineral acid solution can be extracted to form an organic solution that includes the rare earth salts. The organic solution can be mixed with water to form an aqueous solution that includes the rare earth salts. The rare earth elements are separated from the aqueous solution. | 10-31-2013 |
20140193317 | Methods of Recovering Scandium from Titanium Residue Streams - A method for selectively removing scandium from a scandium-containing feed solution includes contacting the scandium-containing feed solution with a solvent stream in plural stages using cross current extraction, in which the solvent is loaded with at least a portion of the scandium from the feed solution, and/or ion exchange, and separating the loaded solvent from remaining scandium-containing feed solution. | 07-10-2014 |
20140234187 | VALUABLE METAL EXTRACTION AGENT AND VALUABLE METAL EXTRACTION METHOD USING SAID EXTRACTION AGENT - The objective of the present invention is to selectively extract light rare earth metals, and by extension, europium, from an acidic solution containing a plurality of types of rare earth metal. This valuable metal extraction agent is represented by the general formula. In the formula: R | 08-21-2014 |
20140356259 | Selective Separation of Rare Earth Metals by Integrated Extraction and Crystallization - An integrated recovery process for rare earth recovery includes bringing the acid solution containing rare earth elements into contact with an organic phase containing an extraction agent to extract the rare earth elements into the organic phase. The organic phase is separated from the aqueous phase. The rare earth elements are either collected from the aqueous phase of the extraction process or the rare earth elements are stripped from the organic phase to an aqueous solution. Rare earth powders are collected from the aqueous solution by partly removing the aqueous solvent. Alternatively, the aqueous solvent can be completely removed, the collected rare earth powders are dissolved in an acidic solution, and the mixture is equilibrated for crystallization of the target rare earth element. In both cases, the crystals and a mother liquor are separated by solid/liquid separation. | 12-04-2014 |
20140377150 | SCANDIUM EXTRACTION METHOD - Provided is a method for selectively extracting and inexpensively recovering scandium from an acidic solution containing calcium, magnesium, and scandium. The scandium extraction method according to the present invention involves subjecting an acidic solution containing calcium, magnesium, and scandium to solvent extraction using an extraction agent consisting of an amide derivative represented by the general formula below. In the formula, R | 12-25-2014 |
20150104361 | PROCESSES FOR RECOVERING RARE EARTH ELEMENTS AND RARE METALS - There are provided processes for recovering at least one rare earth element. Such processes comprise obtaining an acidic composition comprising (i) at least one rare earth element and optionally at least one rare metal; and reacting the composition with a precipitating agent so as to substantially selectively precipitate a first rare earth element and optionally a first rare metal. For example, various rare earth elements (such as scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, etc) and various rare metals (such as indium, zirconium, lithium, gallium, etc.) can be extracted by using such processes. | 04-16-2015 |
20150139871 | RECOVERY OF RARE EARTH ELEMENTS AND COMPOUNDS FROM COAL ASH - The coal ash can be sorted into groups of substantially unburned carbon and substantially burned carbon. The substantially unburned carbon or the substantially burned carbon can be magnetically treated to cause separation into a substantially magnetic portion and a substantially non-magnetic portion. The substantially magnetic portion or the substantially non-magnetic portion can be filtered into a substantially course portion and a substantially fine portion. The substantially coarse portion or the substantially fine portion can be treated with a mineral acid to form an aqueous mineral acid solution. The aqueous mineral acid solution can be extracted to form an organic solution that includes the rare earth salts. The organic solution can be mixed with water to form an aqueous solution that includes the rare earth salts. The rare earth salts can be separated from the aqueous solution. | 05-21-2015 |
20150307965 | PROCESSES FOR RECOVERING RARE EARTH ELEMENTS FROM ALUMINUM-BEARING MATERIALS - The present disclosure relates to processes for recovering rare earth elements from an aluminum-bearing material. The processes can comprise leaching the aluminum-bearing material with an acid so as to obtain a leachate comprising at least one aluminum ion, at least one iron ion, at least one rare earth element, and a solid, and separating the leachate from the solid. The processes can also comprise substantially selectively removing at least one of the at least one aluminum ion and the at least one iron ion from the leachate and optionally obtaining a precipitate. The processes can also comprise substantially selectively removing the at least one rare earth element from the leachate and/or the precipitate. | 10-29-2015 |
20150307966 | A Process, Method and Plant for Recovering Scandium - The present invention relates to a process, method and plant for recovering scandium and ions containing scandium using an ion exchange resin from a feed stream. The feed stream may be, but is by no means limited to, a leach liquor or leach pulp. | 10-29-2015 |
20160010177 | METHOD FOR SEPARATING IMPURITIES FROM AN ACIDIC SOLUTION CONTAINING NICKEL AND COBALT AND/OR SCANDIUM | 01-14-2016 |
20160068930 | EXTRACTION/SEPARATION METHOD - The inventive extraction/separation method involves the step of contacting an organic phase containing a dialkyldiglycol amic acid extractant: R | 03-10-2016 |
20160177420 | SOLVENT EXTRACTION OF SCANDIUM FROM LEACH SOLUTIONS | 06-23-2016 |
20160251739 | METHOD OF RECOVERING RARE-EARTH ELEMENTS | 09-01-2016 |
20170233849 | METHOD OF REFINING OF SCANDIUM OXIDE FROM CONCENTRATES USING SOLVENT EXTRACTION | 08-17-2017 |