Rare earth metal compounds, methods of making, and methods of using the same

Rare earth metal compounds, particularly lanthanum, cerium, and yttrium, are formed as porous particles and are effective in binding metals, metal ions, and phosphate. A method of making the particles and a method of using the particles is disclosed. The particles may be used in the gastrointestinal tract or the bloodstream to remove phosphate or to treat hyperphosphatemia in mammals. The particles may also be used to remove metals from fluids such as water.

METHOD OF PREPARING AN ORGANIC-INORGANIC HYBRID NANOFLOWER

The technical field of enzyme immobilization, and particularly, an organic-inorganic hybrid nanoflower and a preparation method thereof. The organic-inorganic hybrid nanoflower is a flower-like immobilized enzyme formed by self-assembly of a layered rare earth compound as an inorganic carrier and a biological enzyme as an organic component. The layered rare earth compound is Ln(OH)NO.nHO, where Ln is one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Y, and n=1.1-2.5. The biological enzyme is one or more of α-amylase, horseradish peroxidase, or laccase. A layered rare earth compound is used as the inorganic carrier for the organic biological enzyme to form the flower-like immobilized enzyme. The immobilized enzyme has better stability and higher catalytic performance when compared with a free enzyme. 1. (canceled)2. A method of preparing the organic-inorganic hybrid nanoflower of claim 1 , comprising:mixing a rare earth nitrate aqueous solution with a biological enzyme to obtain a mixed solution, wherein a rare earth ion in a rare earth nitrate is one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Y;adding ammonium nitrate and ammonia water in sequence to the mixed solution, and then aging to obtain an aged solution;centrifuging, washing, and drying the aged solution in sequence to obtain the organic-inorganic hybrid nanoflower.3. The method of claim 2 , wherein the rare earth ion in the rare earth nitrate aqueous solution has a molar concentration of 0.005-1 mol/L.4. The method of claim 2 , wherein the biological enzyme in the rare earth nitrate aqueous solution has a concentration of 0.001-3 mg/mL.5. The method of claim 2 , wherein the mixing is carried out at 15-60° C.6. The method of claim 2 , wherein the molar ratio of the ammonium nitrate to the rare earth ion is (1-10):1.7. The method of claim 2 , wherein the mixed solution after addition of ammonia water has a pH of 5-8.8. The method of claim 2 , wherein the aging is ...

PROCESS FOR THE RECOVERY OF RARE EARTHS

A method for the precipitation of rare earth sulphate, the method including subjecting a crude rare earth sulphate solution to precipitation in the presence of a water soluble, volatile, organic compound to produce a rare earth sulphate precipitate and an acidic supernatant. The organic compound is preferably selected from the group consisting of methanol, ethanol, iso-propanol, tert-butanol, acetone or mixtures thereof, and is preferably methanol. Preferably, the organic compound is used in the precipitation at a weight ratio of between 0.25:1 to 1.5:1, and preferably 0.5:to 1.25:1, with the crude sulphate solution. 1. A method for the precipitation of rare earth sulphate , the method including subjecting a crude rare earth sulphate solution to precipitation in the presence of a water soluble , volatile , organic compound to produce a rare earth sulphate precipitate and an acidic supernatant.2. The precipitation method of claim 1 , wherein the water soluble claim 1 , volatile claim 1 , organic compound is selected from the group consisting of methanol claim 1 , ethanol claim 1 , iso-propanol claim 1 , tert-butanol claim 1 , acetone or mixtures thereof.3. The precipitation method of claim 2 , wherein the water soluble claim 2 , volatile claim 2 , organic compound is methanol.4. The precipitation method of claim 3 , wherein methanol is used in precipitation at a weight ratio of between 0.25:1 and 1.5:1 with the sulphate solution.5. The precipitation method of claim 1 , wherein prior to precipitation the sulphate solution has a free sulphuric acid concentration above 5% w/w.6. The precipitation method of claim 1 , wherein precipitation occurs at a temperature in the range of 30 to 85° C. with a residence time in the range of 5 to 120 minutes.7. The precipitation method of claim 1 , wherein the organic compound is recovered from the acidic supernatant by distillation resulting in recovered organic compound and a dilute mixed acid solution claim 1 , with the recovered ...

ORGANIC-INORGANIC HYBRID NANOFLOWER AND PREPARATION METHOD THEREOF

The technical field of enzyme immobilization, and particularly, an organic-inorganic hybrid nanoflower and a preparation method thereof. The organic-inorganic hybrid nanoflower is a flower-like immobilized enzyme formed by self-assembly of a layered rare earth compound as an inorganic carrier and a biological enzyme as an organic component. The layered rare earth compound is Ln(OH)NO.nHO, where Ln is one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Y, and n=1.1-2.5. The biological enzyme is one or more of α-amylase, horseradish peroxidase, or laccase. A layered rare earth compound is used as the inorganic carrier for the organic biological enzyme to form the flower-like immobilized enzyme. The immobilized enzyme has better stability and higher catalytic performance when compared with a free enzyme. 1. An organic-inorganic hybrid nanoflower , comprising:{'sub': 2', '5', '3', '2, 'a flower-like immobilized enzyme formed by self-assembly of a layered rare earth compound as an inorganic carrier, wherein the layered rare earth compound is Ln(OH)NO.nHO, wherein Ln is one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Y, and n=1.1-2.5; and'}a biological enzyme as an organic component, wherein the biological enzyme is one or more of α-amylase, horseradish peroxidase, or laccase.2. A method of preparing the organic-inorganic hybrid nanoflower of claim 1 , comprising:mixing a rare earth nitrate aqueous solution with a biological enzyme to obtain a mixed solution, wherein a rare earth ion in a rare earth nitrate is one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Y;adding ammonium nitrate and ammonia water in sequence to the mixed solution, and then aging to obtain an aged solution;centrifuging, washing, and drying the aged solution in sequence to obtain the organic-inorganic hybrid nanoflower.3. The method of claim 2 , wherein the rare earth ion in the rare earth nitrate aqueous solution has a molar concentration of ...

METHOD FOR PRODUCING HALIDE

A production method for producing a halide includes a heat-treatment step of heat-treating, in an inert gas atmosphere, a mixed material in which LiX and YZare mixed, where X is an element selected from the group consisting of Cl, Br, and I, and Z is an element selected from the group consisting of Cl, Br, and I. In the heat-treatment step, the mixed material is heat-treated at higher than or equal to 200° C. and lower than or equal to 650° C. 1. A production method for producing a halide comprising heat-treating , in an inert gas atmosphere , a mixed material in which LiX and YZare mixed ,where X is an element selected from the group consisting of Cl, Br, and I; andZ is an element selected from the group consisting of Cl, Br, and I,wherein the mixed material is heat-treated at higher than or equal to 200° C. and lower than or equal to 650° C.2. The production method according to claim 1 ,wherein X is Cl or Br; andZ is Cl or Br, and different from X.3. The production method according to claim 2 , wherein the mixed material is further mixed with LiZ.4. The production method according to claim 2 , wherein the mixed material is further mixed with YX.5. The production method according to claim 2 , wherein the mixed material is heat-treated at higher than or equal to 300° C. and lower than or equal to 600° C.6. The production method according to claim 5 , wherein the mixed material is heat-treated at higher than or equal to 450° C.7. The production method according to claim 6 , wherein the mixed material is heat-treated at higher than or equal to 470° C.8. The production method according to claim 7 , wherein the mixed material is heat-treated at higher than or equal to 490° C.9. The production method according to claim 5 , wherein the mixed material is heat-treated at lower than or equal to 550° C.10. The production method according to claim 9 , wherein the mixed material is heat-treated at lower than or equal to 520° C.11. The production method according to claim 2 , ...

COMPOSITIONS OF PARTICULATE MATERIALS

The invention provides a composition of particulate materials. The composition comprises lanthanum chloride in particulate form. The composition also comprises up to about 4% by weight of amorphous silica in particulate form, based on the combined weight of the lanthanum chloride and the amorphous silica. The addition of amorphous silica to desiccated lanthanum chloride forms a fine coating or barrier on the outer surfaces of the individual lanthanum crystals, providing a composition that is significantly more stable and able to resist coalescence of particles than pure desiccated lanthanum chloride. 1. A composition of particulate materials , comprising particles of lanthanum chloride mixed with particles of amorphous silica , the composition comprising up to about 4% by weight of amorphous silica based on the combined weight of the lanthanum chloride and the amorphous silica.213-. (canceled)14. The composition according to claim 1 , wherein the lanthanum chloride is desiccated crystalline lanthanum chloride.15. The composition according to claim 14 , wherein the crystalline lanthanum chloride is lanthanum chloride hexahydrate or lanthanum chloride heptahydrate.16. The composition according to claim 1 , wherein said composition comprises at least about 85% by weight claim 1 , or at least about 90% by weight claim 1 , or at least about 95% by weight of the lanthanum chloride.17. The composition according to claim 1 , wherein said composition comprises at least about 90% by weight claim 1 , or at least about 95% by weight claim 1 , of the combined weight of the lanthanum chloride and the silica.18. The composition according to claim 1 , wherein said composition comprises up to about 3% by weight claim 1 , or up to about 2% by weight claim 1 , or up to about 1% by weight of the amorphous silica claim 1 , based on the combined weight of the lanthanum chloride and the amorphous silica.19. The composition according to claim 1 , wherein the amorphous silica is hydrophilic ...

RARE-EARTH HALIDE SCINTILLATING MATERIAL AND APPLICATION THEREOF

The present invention provides a rare-earth halide scintillating material and application thereof. The rare-earth halide scintillating material has a chemical formula of RECeX, wherein RE is a rare-earth element La, Gd, Lu or Y, X is one or two of halogens Cl, Br and I, 0≤a≤1.1, 0.01≤b≤1.1, and 1.0001≤a+b≤1.2. By taking a +2 valent rare-earth halide having the same composition as a dopant to replace a heterogeneous alkaline earth metal halide in the prior art for doping, the rare-earth halide scintillating material is relatively short of a halogen ion. The apparent valence state of a rare-earth ion is between +2 and +3. The rare-earth halide scintillating material belongs to non-stoichiometric compounds, but still retains a crystal structure of an original stoichiometric compound, and has more excellent energy resolution and energy response linearity than the stoichiometric compound. 1. A rare-earth halide scintillating material having a chemical formula of RECeX , wherein RE is a rare-earth element La , Gd , Lu or Y , X is one or two of halogens Cl , Br and I , 0≤a≤1.1 , 0.01≤b≤1.1 , and 1.0001≤a+b≤1.2.2. The rare-earth halide scintillating material according to claim 1 , wherein RE is La claim 1 , and X is Br.3. The rare-earth halide scintillating material according to claim 1 , wherein RE is La claim 1 , and X is Cl.4. The rare-earth halide scintillating material according to claim 1 , wherein RE is Gd claim 1 , Lu or Y claim 1 , and X is I.5. The rare-earth halide scintillating material according to claim 1 , wherein 0.9≤a≤1 claim 1 , 0.02≤b≤0.2 claim 1 , and 1.0001≤a+b≤1.1.6. The rare-earth halide scintillating material according to claim 1 , wherein a=0 claim 1 , and 1.0001≤b≤1.1.7. The rare-earth halide scintillating material according to claim 1 , wherein the scintillating material is a single crystal.8. The rare-earth halide scintillating material according to claim 7 , wherein the rare-earth halide scintillating material is obtained by the Bridgeman- ...

Method of Reprocessing Nitride Spent Nuclear Fuel in Salt Melts

A method for reprocessing nitride spent nuclear fuel in molten salts comprises chlorinating the fuel in a melt of a mixture of alkali and/or alkaline earth metal chlorides containing cadmium dichloride. The chlorination is carried out in an apparatus for reprocessing nitride spent nuclear fuel using an inert gas atmosphere The apparatus has a heated zone containing a reactor with molten chlorides and nitride spent nuclear fuel submerged therein, and also a cold zone arranged under the reactor. In the chlorination process, the zone of the apparatus containing the reactor is heated to a temperature greater than 700° C., the nitride spent nuclear fuel is kept in the melt until fully chlorinated. The cold zone of the apparatus is used for crystallizing metallic cadmium which forms during the chlorination. 145354. Method of reprocessing nitride spent nuclear fuel in salt melts , involving its chlorination in the melt of a mixture of chlorides of alkali and/or alkaline-earth metals containing cadmium dichloride , wherein the chlorination is carried out in an apparatus for reprocessing nitride spent nuclear fuel with the use of an inert gas atmosphere , characterized in that the chlorination is carried out in an apparatus having a heated zone I in which a reactor with a chloride melt and an immersed therein nitride spent nuclear fuel is located , as well as a cold zone II located below the reactor , wherein in the course of the chlorination zone I of the apparatus with reactor is heated up to a temperature higher than 700° C. , the nitride spent nuclear fuel is held in the melt up to a complete chlorination , while cold zone II of the apparatus is used for a crystallization of metallic cadmium formed during the chlorination.2. The method according to claim 1 , characterized in that as chlorides of alkali and/or alkaline-earth metals chlorides of lithium claim 1 , potassium claim 1 , sodium claim 1 , cesium claim 1 , calcium claim 1 , magnesium claim 1 , strontium claim 1 , ...

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 3 + ) ions, or mixtures thereof, contacting the aqueous solution with a scandium containing material containing one or more impurities to produce a scandium-loaded solution and a depleted scandium containing material, separating the depleted scandium containing material from the scandium loaded solution, treating the scandium loaded solution to cause precipitation of a solid scandium-containing material whilst avoiding or minimising precipitation of impurities present in the aqueous solution, and separating the solid scandium-containing material from the solution. In another embodiment, a high purity scandium containing is produced by contacting a solid material containing scandium with an acid to form a scandium loaded solution, separating the scandium loaded solution from any solids, adding additional acid to the scandium loaded solution to reduce the pH and precipitating a high purity scandium oxalate material by adding oxalic acid to the solution.

Method for thermal barrier coating production by recycling thermal barrier coating materials

Disclosed are methods to produce Thermal Barrier Coating (TBC) products using materials recycled from TBC waste. These methods include ways to produce zirconium and rare earth chemicals and raw materials appropriate for producing TBC materials.

Cerium-containing inorganic scintillator material.

The invention concerns an inorganic scintillator material of general composition M1-xCexBr3, wherein: M is selected among lanthanides or lanthanide mixtures of the group consisting of La, Gd, Y in particular among lanthanides or lanthanide mixtures of the group consisting of La, Gd; and x is the molar rate of substitution of M with cerium, x being not less that 0.01 mol % and strictly less than 100 mol %. The invention also concerns a method of growing such a monocrystalline scintillator material, and the use of same as component of a scintillating detector for industrial and medical purpose or in the oil industry.

Scintillator crystals, method for making same, use thereof

본 발명은 일반 조성 M 1-X Ce X Cl 3 의 무기 섬광체 물질에 관한 것으로, 이 화학식에서 M은 란탄족 원소 또는 란탄족 원소의 혼합물, 바람직하게는 Y, La, Gd, Lu로 이루어진 그룹의 원소 또는 원소 혼합물, 특히 La, Gd, Lu로 이루어진 그룹의 원소 또는 원소 혼합물로부터 선택되고, X는 세륨과 M의 몰 치환 속도이며, X는 1 mol% 이상이고 엄밀하게는 100 mol% 미만이다. 본 발명은 또한 상기 단일 결정성 섬광 물질을 성장시키는 방법과, 특히 산업, 의학 목적, 그리고 석유 산업에서 섬광 검출기의 하나의 구성요소로 상기 섬광 물질을 사용하는 것에 관한 것이다. The present invention relates to inorganic scintillator materials of general composition M 1-X Ce X Cl 3 , wherein M is a lanthanide or a mixture of lanthanides, preferably of the group consisting of Y, La, Gd, Lu An element or a mixture of elements, in particular an element or a mixture of elements of the group consisting of La, Gd, Lu, X is the molar substitution rate of cerium and M, X is at least 1 mol% and strictly less than 100 mol%. The invention also relates to a method of growing the single crystalline scintillation material and in particular to the use of the scintillation material as a component of the scintillation detector in the industrial, medical and petroleum industries.

ANHYDROUS COMPOUND BASED ON A RARE EARTH OR GALLIUM HALIDE, PREPARATION METHOD THEREOF AND USE THEREOF AS CATALYST

稀土卤化物闪烁材料及其应用

本发明提供了一种稀土卤化物闪烁材料及其应用。该稀土卤化物闪烁材料的化学通式为RE a Ce b X 3 ，其中RE为稀土元素La、Gd、Lu或Y，X为卤素Cl、Br及I中的一种或两种，0≤a≤1.1，0.01≤b≤1.1，且1.0001≤a+b≤1.2。通过采用同组分的+2价稀土卤化物作为掺杂剂代替现有技术中的异质碱土金属卤化物进行掺杂，使得稀土卤化物闪烁材料中卤素离子相对短缺，稀土离子的表观价态介于+2和+3价之间，属于一种非整比化合物，但仍保持原整比化合物的晶体结构，且具有比整比化合物更优异的能量分辨率和能量响应线性。

稀土卤化物闪烁材料及其应用

本发明提供了一种稀土卤化物闪烁材料及其应用。该稀土卤化物闪烁材料的化学通式为RE a Ce b X 3 ，其中RE为稀土元素La、Gd、Lu或Y，X为卤素Cl、Br及I中的一种或两种，0≤a≤1.0，0.01≤b≤1.1，且1.0001≤a+b≤1.2。通过采用同组分的+2价稀土卤化物作为掺杂剂代替现有技术中的异质碱土金属卤化物进行掺杂，使得稀土卤化物闪烁材料中卤素离子相对短缺，稀土离子的表观价态介于+2和+3价之间，属于一种非整比化合物，但仍保持原整比化合物的晶体结构，且具有比整比化合物更优异的能量分辨率和能量响应线性。

Rare Earth or Gallium Additive Composition, Methods for Preparing Same and Use Thereof as Catalyst

카르복실산과 할라이드와의 부가 화합물 또는 동일한 산의 희토류 또는 갈륨 할로게노카르복실레이트와의 부가 화합물은, 알칸, 시클로알칸, 방향족 용매 및 이들의 혼합물로부터 선택되는 용매 중에서 HX (X는 할로겐을 나타냄)를 희토류 또는 갈륨 카르복실레이트와 반응시키되, 이 반응을 할로게노카르복실레이트의 제조시 희토류 또는 갈륨에 대한 X의 원자비가 3 미만이 되도록 수행하는 것을 특징으로 하는 방법에 의해 얻을 수 있다. 본 발명의 제2 방법은, 카르복실산과 상기 유형의 희토류 할라이드와의 부가 화합물을 제조하고, 수득된 매질에 질소 또는 산소 공여체를 첨가하는 것으로 이루어진, 희토류 또는 갈륨 할라이드와 질소 또는 산소 공여체 화합물과의 무수 부가 화합물을 제조하는 방법에 관한 것이다. Addition compounds of carboxylic acids and halides or addition compounds of rare earths or gallium halogenocarboxylates of the same acid are HX in the solvent selected from alkanes, cycloalkanes, aromatic solvents and mixtures thereof (X represents halogen) May be reacted with rare earth or gallium carboxylate, and the reaction is carried out such that the atomic ratio of X to rare earth or gallium is less than 3 when preparing the halogenocarboxylate. The second process of the invention comprises the preparation of an addition compound of a carboxylic acid with a rare earth halide of this type and the addition of a nitrogen or oxygen donor to the obtained medium, with a rare earth or gallium halide and a nitrogen or oxygen donor compound. It relates to a method for producing an anhydride addition compound.

Rare earth or gallium additive composition, methods for preparing the same and use thereof as catalyst

The present invention concerns an addition compound of a carboxylic acid and a rare earth or gallium halide or a rare earth or gallium halogenocarboxylate of the same acid. This compound is obtained by a process in which a rare earth or gallium carboxylate is reacted with HX, X representing a halogen, in a solvent selected from alkanes, cycloalkanes and aromatic solvents and mixtures thereof, the reaction being carried out with an X/rare earth or gallium atomic ratio of less than 3 when preparing a halogenocarboxylate. The invention also concerns a second process for preparing an anhydrous addition compound of a rare earth or gallium halide and a nitrogen or oxygen donor compound in which an addition compound of a carboxylic acid and a rare earth halide of the type described above is prepared, and a nitrogen or oxygen donor is added to the medium obtained, the donor being selected from linear and cyclic aliphatic oxides, aliphatic glycol ethers, aliphatic ketones, aliphatic amides, aliphatic nitrites, aliphatic sulphoxides and hexamethylphosphotriamide.

Separation and purification system of rare earth with reverse osmosis membrane separation process

Colloidal dispersions of cerium (iv) compounds and process for preparing the same

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Method for producing ceric oxide having novel morphological characteristics

Method for separating isotopes of lanthanides and thorium using gas centrifuge method

FIELD: chemistry. SUBSTANCE: invention can be used in obtaining highly enriched isotopes of lanthanides or thorium. The method for separating isotopes of lanthanides and thorium by separating molecules of a gaseous metal compound by the molecular weight thereof in a field of centrifugal forces in a cascade of separating elements includes synthesising a volatile metal compound - metal tetraborohydride or metal tetramethyl borohydride. Said compound is supplied to a cascade of separating elements and a gas fraction enriched by the target isotope is isolated. A cascade of gas centrifuges is used as the cascade of separating elements. The gas fractions obtained during separation in the cascade of separating elements is processed using a chlorinating reagent. Hydrogen chloride is used as the chlorinating agent for the purpose of recycling lithium borohydride or lithium methyl borohydride used in synthesising the volatile metal compound. EFFECT: invention allows improving efficiency of separation of isotopes of lanthanides and thorium and providing recycling of reagents used in the process. 3 cl, 2 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) (19) RU (11) (13) 2 753 033 C1 (51) МПК B01D 59/20 (2006.01) C01F 15/00 (2006.01) C01F 17/10 (2020.01) C01F 17/271 (2020.01) C01F 17/30 (2020.01) C01B 6/21 (2006.01) C01D 15/00 (2006.01) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК B01D 59/20 (2021.02); C01F 15/00 (2021.02); C01F 17/10 (2021.02); C01F 17/271 (2021.02); C01F 17/30 (2021.02); C01B 6/21 (2021.02); C01D 15/00 (2021.02); Y10S 423/07 (2021.02) (21)(22) Заявка: 2020120002, 09.06.2020 09.06.2020 Дата регистрации: 11.08.2021 (45) Опубликовано: 11.08.2021 Бюл. № 23 Адрес для переписки: 663690, Красноярский край, г. Зеленогорск, ул. Первая Промышленная, 1, АО "ПО ЭХЗ" 2 7 5 3 0 3 3 C 1 (56) Список документов, цитированных в отчете о поиске: US 2010111800 A1, 06.05.2010. RU 2638858 C2, 18.12.2017. RU 2448763 C2, 27.04.2012. US 2019001005 A1, 03.01 ...

Macrocyclic host molecule based core-shell nano particle and synthetic method thereof

본 발명의 일 실시예에 따르면, 코어 구조체; 및 상기 코어 구조체를 커버하며 상기 코어 구조체와 나노갭을 두고 이격되어 제공되는 쉘 구조체를 포함하고, 상기 코어 구조체의 표면에는 분자 내부에서 소수성을 나타내고 분자 외부에서 친수성을 나타내는 매크로사이클릭 호스트 분자 및 상기 매크로사이클릭 호스트 분자의 분자 내부에 삽입된 라만활성물질이 제공되고, 상기 매크로사이클릭 호스트 분자 및 상기 라만활성물질은 상기 나노갭을 채우는, 나노입자가 제공된다.

Method for Extracting and Separating Light Rare Earth Element

목적 경 희토류 원소는, 향류 다단계 믹서-침강기에서 거기에 알칼리 용액을 첨가하면서 추출제를 함유하는 유기상을 수용액과 접촉시키고, 목적 원소를 역추출하기 위해 유기상을 산 수용액과 접촉시킴으로써 두가지 이상의 경 희토류 원소들을 함유하는 수용액으로부터 추출 및 분리된다. 추출제는 일반식: R 1 R 2 NCOCH 2 OCH 2 COOH 를 갖는 디알킬 디글리콜 아믹산이며, 여기서 R 1 및 R 2 는 알킬이고, 적어도 하나는 적어도 6개 탄소 원자를 갖는다. The target light rare earth element is obtained by contacting an organic phase containing an extractant with an aqueous solution while adding an alkali solution thereto in a countercurrent multi-stage mixer-settler and bringing the organic phase into contact with an aqueous acid solution to back- Are extracted and separated from an aqueous solution containing the elements. The extractant is a dialkyldiglycol amic acid having the general formula: R 1 R 2 NCOCH 2 OCH 2 COOH, wherein R 1 and R 2 are alkyl and at least one has at least 6 carbon atoms.

Method of extraction and separation of light rare-earth element

FIELD: chemistry. SUBSTANCE: invention relates to a method of extracting a targeted light rare-earth element from an aqueous solution containing two or more elements of La, Ce, Pr, and Nd by contacting the organic phase containing extractant with an aqueous solution in a counterflow multistage mixer-settler. Herewith an alkaline solution is added. Then the organic phase is brought into contact with the aqueous solution of acid for reverse extraction of the targeted element. Extractant represents dialkyl diglycol amido acid of the formula: R 1 R 2 NCOCH 2 OCH 2 COOH, where R 1 and R 2 are alkyl, herewith at least one of them has at least 6 carbon atoms. EFFECT: technical result is higher efficiency of extraction of light rare-earth element on an industrial scale. 1 cl, 1 dwg, 4 tbl, 5 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 598 415 C2 (51) МПК C22B 59/00 (2006.01) C22B 3/26 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2012126654/02, 26.06.2012 (24) Дата начала отсчета срока действия патента: 26.06.2012 Приоритет(ы): (30) Конвенционный приоритет: (72) Автор(ы): СУГАХАРА, Хирото (JP), САКАКИ, Кадзуаки (JP), МИНОВА, Такехиса (JP) 27.06.2011 JP 2011-141570; 10.01.2012 JP 2012-001824 R U (73) Патентообладатель(и): СИН-ЭЦУ КЕМИКАЛ КО., ЛТД. (JP) (43) Дата публикации заявки: 10.01.2014 Бюл. № 1 (54) СПОСОБ ЭКСТРАКЦИИ И ВЫДЕЛЕНИЯ ЛЕГКОГО РЕДКОЗЕМЕЛЬНОГО ЭЛЕМЕНТА (57) Реферат: Изобретение относится к способу выделения для обратной экстракции целевого элемента. целевого легкого редкоземельного элемента из Экстрагент представляет собой водного раствора, содержащего два или более диалкилдигликольамидокислоту, имеющую элемента из La, Ce, Pr и Nd, путем формулу: R1R2NCOCH2OCH2COOH, где R1 и R2 контактирования органической фазы, представляют собой алкил, причем по меньшей содержащей экстрагент, с водным раствором в мере один из них имеет по меньшей мере 6 атомов противоточном многоступенчатом ...

Mixed rare earth of lanthanum and cerium

一种稀土金属化合物。现有的产品为含镧铈镨钕为主的混合稀土，既浪费了镨钕资源，又不能充分地发挥镧铈的应用效果。本发明为镧铈混合稀土，其La 2 O 3 +CeO 2 量占总稀土的95％以上，La 2 O 3 /CeO 2 比例为1∶4～10∶1，可用于发火合金，钢铁、铝铜锌等金属或合金冶炼的添加剂，贮氢材料，研磨材料，玻璃熔澄清脱色，催化剂的制造和农业微肥，提高了镧铈镨钕四个稀土元素的经济效益。

Total removal of actinoids from strongly acidic water phase by means of solvating extractants in salting-out medium

FIELD: power industry. SUBSTANCE: method involves combined separation of all actinoid (III), (IV), (V) and (VI) components present in strongly acidic water phase from fission products, namely lanthanides also present in that phase, by means of solvating extractant in salting-out medium. EFFECT: invention allows catching all other actinoids from solution for decomposition of irradiated nuclear fuel pre-cleaned from uranium contained in it using the combined method which is selective in relation to fission products. 29 cl, 2 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 456 689 (13) C2 (51) МПК G21C 19/44 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2009119466/07, 22.10.2007 (24) Дата начала отсчета срока действия патента: 22.10.2007 (72) Автор(ы): МИГИРДИЧЬЯН Мануэль (FR), БАРОН Паскаль (FR) (43) Дата публикации заявки: 10.12.2010 Бюл. № 34 2 4 5 6 6 8 9 (45) Опубликовано: 20.07.2012 Бюл. № 20 (56) Список документов, цитированных в отчете о поиске: FR 2845616 A1, 26.09.1997. RU 99125737 A, 10.10.2001. FR 2810679 A1, 28.12.2001. SU 601971 A1, 25.09.1979. RU 2005129985 A, 20.04.2006. FR 2845616 A1, 16.04.2004. EP 0110789 A1, 13.06.1984. 2 4 5 6 6 8 9 R U (86) Заявка PCT: EP 2007/061287 (22.10.2007) C 2 C 2 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 25.05.2009 (87) Публикация заявки РСТ: WO 2008/049807 (02.05.2008) Адрес для переписки: 103735, Москва, ул. Ильинка, 5/2, ООО "Союзпатент", Е.В.Воробьевой, рег. № 1263 (54) СУММАРНОЕ ИЗВЛЕЧЕНИЕ АКТИНОИДОВ ИЗ СИЛЬНОКИСЛОЙ ВОДНОЙ ФАЗЫ С ПОМОЩЬЮ СОЛЬВАТИРУЮЩИХ ЭКСТРАГЕНТОВ В ВЫСАЛИВАЮЩЕЙ СРЕДЕ (57) Реферат: Изобретение относится к переработке облученного ядерного топлива, для извлечения плутония, нептуния, америция, кюрия и возможно урана, присутствующих в следовых количествах, суммарным, но селективным в отношении лантаноидов способом, из раствора для разложения облученного ядерного топлива после проведения цикла экстракции. Данный способ ...

Cerium oxide-based composition and process for its preparation

A kind of bauxite salt Ore Leaching substep electrolytic preparation aluminum oxide and method of comprehensive utilization

一种铝土矿盐酸浸出分步电解制备氧化铝及综合利用方法，包括以下步骤：将铝土矿经盐酸浸出、固液分离和提纯处理后，得到氯化铁混合溶液和氯化铝混合溶液；分别分离提纯氯化铝混合溶液和氯化铁混合溶液，得到氯化钪和氯化镓，以及氯化铝与氯化铁水溶液；设定电解电压和电流密度，将氯化铝与氯化铁水溶液分别进行两步电解，分别得到氢氧化铝、氢气和氯气；氢氧化铁、氢气和氯气；生成的氢气和氯气制备盐酸溶液返回浸出段循环利用；氢氧化铝经焙烧获得冶金级氧化铝或化学品氧化铝。本发明采用电解方法回收铝土矿中的氧化铝，处理铝土矿与传统酸法相比，取消了蒸发、浓缩及其设备，简化操作的同时，大幅降低成本，且产物具有较高纯度。

Method for recovering rare earth, aluminum and silicon from rare earth-containing aluminum and silicon wastes

本发明提供了一种从含稀土的铝硅废料中回收稀土、铝和硅的方法。该方法包括：S1，利用无机酸水溶液对含稀土的铝硅废料进行酸浸，得到富硅渣以及含稀土和铝离子的酸浸液；S2，向含稀土和铝离子的酸浸液中加入碱性物质并控制酸浸液的pH值为3.5～5.2，固液分离得到含氢氧化铝的沉淀和含稀土的滤液；S3，用含氢氧化铝的沉淀与氢氧化钠反应得到偏铝酸钠溶液和铝硅渣，并利用含稀土的滤液制备稀土化合物产品。上述方法将铝和稀土用酸溶解，然后通过分段碱转，先将铝离子沉淀得到氢氧化铝与稀土离子分离，然后加入过量的氢氧化钠将氢氧化铝转化偏铝酸钠溶液，实现稀土和铝同时高效回收利用，而且大幅减少氢氧化钠用量，降低了回收成本。

Scintillator crystals, method for making same, use thereof

本发明涉及的是组成为M 1－x Ce x Br 3 的无机闪烁材料，其中M在La、Gd、Y这组镧系或镧系元素的混合物中选择，特别是在La、Gd这组镧系元素或镧系元素的混合物中选择。其中x是Ce置换M的摩尔比，这里x大于或等于0.01摩尔％，而且严格地小于100摩尔％。本发明涉及的也是这种闪烁材料单晶的生长方法和这种闪烁材料作为闪烁探测器部件的使用，特别是对工业、医学或石油产业的应用。

Method of separating and purifying Yttrium-90 from Strontium-90

The present invention provides a method of separating and purifying Yttrium-90 (Y-90) from Strontium-90 (Sr-90). In addition, a zirconium (Zr) clean-up step for the Y-90 is provided. Uses of the Y-90 purified by the method include cancer research and treatment. Y-90 is particularly useful in cell directed therapy, e.g., where the Y-90 is attached directly or indirectly to a targeting molecule such as an antibody.

Method of processing spent nuclear fuel nitride in salt melts

FIELD: physics. SUBSTANCE: invention relates to nuclear power engineering, in particular to methods of processing spent nuclear fuel, and can be used in technology of processing spent nuclear fuel in closed nuclear fuel cycle circuit, extracted from fuel elements. Method of processing spent nitride nuclear fuel in salt melt includes its chlorination in melt of mixture of chlorides of alkali and/or alkali-earth metals containing cadmium dichloride. Chlorination is carried out in an apparatus for processing spent nitride nuclear fuel using an inert gas atmosphere. Apparatus has a heated zone in which there is a reactor with a chloride melt and a spent nitride nuclear fuel immersed therein, as well as a cold zone located under the reactor. During chlorination zone of apparatus with reactor is heated to temperature higher than 700 °C, nitride spent nuclear fuel is held in the melt until complete chlorination, wherein the apparatus cold zone is used for crystallisation of metal cadmium formed during chlorination. EFFECT: invention increases degree of conversion of spent nitride nuclear fuel in molten chloride to 100 %. 1 cl, 3 dwg, 1 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 732 740 C1 (51) МПК G21C 19/42 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК G21C 19/42 (2020.05) (21)(22) Заявка: 2019137674, 29.12.2017 (24) Дата начала отсчета срока действия патента: Дата регистрации: 22.09.2020 (45) Опубликовано: 22.09.2020 Бюл. № 27 (73) Патентообладатель(и): Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (RU) (85) Дата начала рассмотрения заявки PCT на национальной фазе: 22.11.2019 (86) Заявка PCT: (56) Список документов, цитированных в отчете о поиске: RU 2603844 C1, 10.12.2016. RU 2499306 C1, 20.11.2013. JP 2000284090 A, 13.10.2000. JP 2000131489 A, 12.05.2000. RU 2017/001020 (29.12.2017) 2 7 3 2 7 4 0 R U WO 2019/132701 (04.07.2019) Адрес для переписки: ...

Method of separating and purifying Yttrium-90 from Strontium-90

The present invention provides a method of separating and purifying Yttrium-90 (Y-90) from Strontium-90 (Sr-90). In addition, a zirconium (Zr) clean-up step for the Y-90 is provided. Uses of the Y-90 purified by the method include cancer research and treatment. Y-90 is particularly useful in cell directed therapy, e.g., where the Y-90 is attached directly or indirectly to a targeting molecule such as an antibody.

Method for producing gadolinium (iii) chloride with reduced content of uranium and thorium

FIELD: chemical industry. SUBSTANCE: invention relates to the technology of inorganic materials and concerns the development of a method for producing gadolinium (III) chloride with a reduced content of uranium and thorium. The method for producing gadolinium (III) chloride is purification by annealing in a dynamic vacuum. Moreover, at the first stage, gadolinium chloride is calcined in an atmosphere of hydrogen chloride at atmospheric or reduced pressure at a temperature of 500-600°C. At the second stage, gadolinium chloride is annealed in vacuum at a temperature of 600-700°C and residual pressure of no higher than 10 -4 Torr. EFFECT: increasing the depth of purification of gadolinium chloride for uranium and thorium to less than 10 -8 wt.% with the content of the main substance at least 99.999 wt.%, while simplifying the known technologies and obtaining a minimum amount of waste. 4 cl, 1 tbl, 2 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 753 711 C1 (51) МПК C01F 17/10 (2020.01) C01F 17/271 (2020.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C01F 17/10 (2021.02); C01F 17/271 (2021.02) (21)(22) Заявка: 2020123519, 15.07.2020 (24) Дата начала отсчета срока действия патента: Дата регистрации: 20.08.2021 (45) Опубликовано: 20.08.2021 Бюл. № 23 (54) СПОСОБ ПОЛУЧЕНИЯ ХЛОРИДА ГАДОЛИНИЯ (III) С ПОНИЖЕННЫМ СОДЕРЖАНИЕМ УРАНА И ТОРИЯ (57) Реферат: Изобретение относится к технологии 600°С. На второй стадии осуществляют отжиг неорганических материалов и касается хлорида гадолиния в вакууме при температуре разработки способа получения хлорида 600-700°С и остаточном давлении не выше 10-4 гадолиния (III) с пониженным содержанием урана Торр. Обеспечивается повышение глубины и тория. Способ получения хлорида гадолиния очистки хлорида гадолиния по урану и торию до (III) заключается в очистке отжигом в величины менее 10-8 мас.% при содержании динамическом вакууме. Причем на первой стадии основного вещества не менее 99,999 мас.%, ...

Inorganic scintillation material, crystalline scintillator and radiation detector

FIELD: chemistry. ^ SUBSTANCE: invention relates to novel inorganic scintillation materials, a novel crystalline scintillator, especially in form of a monocrystal, and can be used to detect ionising radiation in form of low-energy electromagnetic waves, gamma radiation, X-rays, cosmic rays and particles in fundamental physics, computerised tomography devices, PET tomographic scanners, new-generation tomographic scanners, gamma spectrometres, cargo scanners, well logging systems, radiation monitoring systems, etc. The halide-type scintillation material has the formula Ln(1-m-n)HfnCemA(3+n), where A is either Br, Cl or I or a mixture of at least two halogens from this group, Ln is an element selected from: La, Nd, Pm, Sm, Eu, Gd, Tb, Lu, Y; m is molar fraction of substitution of Ln with cerium, n is the molar fraction of substitution of Ln with hafnium, m and n is a number greater than 0 but less than 1, (m+n) is less than 1. The crystalline scintillator has formula Ln(1-m-n)CemA3:n-Hf4+, where Ln(1-m)CemA3 is the formula of the matrix of the material, A is Br, O or I or a mixture of at least two halogens from this group, Ln is an element selected from: La, Nd, Pm, Sm, Eu, Gd, Tb, Lu, Y; Hf4+ is a dopant, m is a number greater than 0 but less than or equal to 0.3, n is content of the Hf4+ dopant (mol %) which is preferably between 0.05 mol % and 1.5 mol %. The radiation detector has a scintillation element based on the novel inorganic scintillation material. ^ EFFECT: scintillation material, crystalline scintillator and radiation detector has excellent scintillation properties, particularly long fluorescence lifetime, good energy resolution and is characterised by low hygroscopicity. ^ 24 cl, 2 tbl, 10 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 426 694 (13) C1 (51) МПК C01F C30B C09K G01T 17/00 29/12 11/85 1/202 (2006.01) (2006.01) (2006.01) (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)( ...

Method for extracting lanthanides and actinides from acid solutions

A process for the recovery of actinide and lanthanide values from aqueous acidic solutions with an organic extractant having the formula: ##STR1## where φ is phenyl, R 1 is a straight or branched alkyl or alkoxyalkyl containing from 6 to 12 carbon atoms and R 2 is an alkyl containing from 3 to 6 carbon atoms. The process is suitable for the separation of actinide and lanthanide values from fission product values found together in high level nuclear reprocessing waste solutions.

Manufacture of cerium oxide

내용 없음.

Preparation method of anhydrous scandium chloride molten salt

本发明提供了一种无水氯化钪熔盐的制备方法。该制备方法包括：步骤S1，利用浓盐酸溶解氧化钪，制得氯化钪溶液；步骤S2，将NaCl、KCl和NH 4 Cl的混合溶液与氯化钪溶液混合，得到氯化钪混合熔盐溶液；步骤S3，对氯化钪熔盐溶液进行第一加热以蒸发HCl和90％以上的游离水，得到含水氯化钪熔盐；步骤S4，对含水氯化钪熔盐进行第二加热以去除其中的游离水和结晶水，得到无水氯化钪熔盐，第二加热的温度为90℃～120℃、保温时间为3～6小时；步骤S5，对无水氯化钪熔盐在管式炉中、真空条件下进行第三加热以去除NH 4 Cl，管式炉的设定温度为400℃～600℃。上述方法无毒气泄露可以安全生产。

Method for extracting and separating light rare earth element

Method for reducing and leaching bastnaesite by utilizing neodymium iron boron reclaimed materials

本发明公开了一种利用钕铁硼回收料还原浸出氟碳铈矿的方法，包括如下内容：(1)将氧化焙烧后的氟碳铈矿与钕铁硼回收料按质量比12.5～20:1混合后用酸浸出，得到固体浸出渣、浸出液；(2)固体浸出渣清洗干净后与氢氧化钠反应，得到氢氧化稀土，氢氧化稀土经清水洗后与浸出液进行混合反应后加入聚丙烯酰胺，固液分离。本发明方法得到非稀土杂质合格的供萃取分离的原料，实现了钕铁硼回收料中高价值稀土元素的有效回收，具有显著的社会效益和可观的经济效益；本发明的方法避免了氟碳铈矿浸出过程中产生有毒性气体氯气，成本低廉且环保。

COLLOIDAL DISPERSION OF AQUEOUS CERIUM IV COMPOUND AND PROCESS FOR PREPARING THE SAME

La présente invention concerne une nouvelle dispersion collodale d'un composé de cérium IV en milieu aqueux et son procédé d'obtention. Le procédé de l'invention est caractérisé par le fait qu'il consiste : - à déstabiliser une dispersion aqueuse collodale d'un composé de cérium IV à l'aide d'un sel d'un acide monovalent, soluble dans l'eau et présentant un pka compris entre 2,5 et 5,0; - à séparer le précipité obtenu; - puis, à le remettre en dispersion, en milieu aqueux. La dispersion collodale obtenue selon l'invention présente une faible acidité. The present invention relates to a novel collodal dispersion of a cerium IV compound in aqueous medium and its process for obtaining it. The process of the invention is characterized by the fact that it consists in: destabilizing a collodal aqueous dispersion of a cerium IV compound using a salt of a monovalent acid, soluble in water and exhibiting a pka between 2.5 and 5.0; - separating the precipitate obtained; - then, to put it back into dispersion, in an aqueous medium. The collodal dispersion obtained according to the invention exhibits low acidity.

Separating actinide groups in strong acidic aqueous phase, comprises coextraction of actinides, lanthanides or yttrium and optionally few other fission products and extraction of actinides

Separating actinide groups (III), (IV), (V) and (VI) from a strong acidic aqueous phase that optionally contains fission products from which lanthanides or yttrium, comprises: coextraction of actinides, lanthanides or yttrium and optionally fission products, from the aqueous phase by contacting with water insoluble organic phase of a solvating extractant, like diglycolamides or malonamides in an organic diluent; and selective extraction of actinides from the organic phase by contacting the organic phase with a weak acidic aqueous phase comprising a complexing agent and nitrate ions. An independent claim is included for a process for reprocessing of irradiated nuclear fuel by implementing the given process.

PROCESS FOR SEPARATING IRON AND / OR ZIRCONIUM FROM ACTINIDES AND / OR LANTHANIDES PRESENT IN AN AQUEOUS ACID SOLUTION USING A PROPANEDIAMIDE.

Method of producing anhydrous chlorides of rare-earth elements

PROCESS FOR RECOVERING RARE EARTHS FROM SOLID MIXTURE CONTAINING HALOPHOSPHATE AND RARE EARTH COMPOUND AND SOLID MIXTURE ADAPTED THEREFOR

Le procédé de l'invention comprend l'attaque acide en milieu liquide d'un solide contenant un halophosphate et un composé d'une terre rare; l'ajout d'une base au milieu obtenu précédemment et la séparation d'une phase solide d'une phase liquide; le mélange et la calcination du solide obtenu précédemment avec un composé solide alcalin; la redispersion dans l'eau du produit calciné, la séparation du produit solide de la suspension obtenue à l'étape précédente; la dispersion dans l'eau de ce solide et l'acidification de la dispersion et la séparation du solide de cette dispersion. The method of the invention comprises acid etching in a liquid medium of a solid containing a halophosphate and a compound of a rare earth; adding a base to the medium obtained previously and separating a solid phase from a liquid phase; mixing and calcining the solid obtained above with an alkaline solid compound; redispersion in water of the calcined product, the separation of the solid product from the suspension obtained in the previous step; the dispersion in water of this solid and the acidification of the dispersion and the separation of the solid from this dispersion.

PROCESS FOR SEPARATING TRIVALENT LANTHANIDE CATIONS BY SELECTIVE COMPLEXATION

PROCESS FOR THE PREPARATION OF A COLLOUIDAL DISPERSION OF A CERIUM IV COMPOUND IN AQUEOUS MEDIA AND DISPERSIONS OBTAINED.

PRASEODYME CLUSTER, AQUEOUS DISPERSION AND SOLVENT DISPERSION OF THIS CLUSTER AND PROCESSES FOR THEIR PREPARATION

NOVEL COLLOIDAL DISPERSIONS OF A CERIUM IV COMPOUND IN AQUEOUS MEDIUM AND PROCESS FOR OBTAINING THEM.

LA PRESENTE INVENTION CONCERNE DE NOUVELLES DISPERSIONS COLLOIDALES AQUEUSES D'UN COMPOSE DE CERIUMIV, SURSATUREES EN IONS OH ET UN DE LEUR PROCEDE D'OBTENTION. LESDITES DISPERSIONS SONT PREPAREES DIRECTEMENT A PARTIR DE LA SOLUTION AQUEUSE DU SEL DE CERIUMIV EN FAISANT REAGIR LADITE SOLUTION AVEC UNE BASE DE FACON A OBTENIR UN TAUX DE SURSATURATION SUPERIEUR A 3 ET INFERIEUR4.

METHODS FOR SELECTIVE RECOVERY OF RARE EARTHS IN AQUEOUS ACID PHASES RESULTING FROM THE TREATMENT OF PERMANENT MAGNETS USED OR REBUIDED

L'invention se rapporte à un procédé hydrométallurgique permettant de récupérer sélectivement au moins une terre rare « lourde », c'est-à-dire de numéro atomique au moins égal à 62, se trouvant dans une phase aqueuse acide issue du traitement d'aimants permanents usagés ou rebutés. Elle se rapporte également à un procédé hydrométallurgique permettant de récupérer sélectivement, dans un premier temps, au moins une terre rare lourde présente dans une phase aqueuse acide issue du traitement d'aimants permanents usagés ou rebutés puis, dans un deuxième temps, au moins une terre rare « légère », c'est-à-dire de numéro atomique au plus égal à 61, se trouvant également dans cette phase aqueuse acide. L'invention trouve notamment application dans le recyclage des terres rares présentes dans des aimants permanents de type Néodyme-Fer-Bore (ou NdFeB) usagés ou rebutés et, en particulier, du dysprosium, du praséodyme et du néodyme, ainsi que dans le recyclage du samarium présent dans des aimants permanents de type Samarium-Cobalt (ou SmCo) usagés ou rebutés.

METHOD FOR SEPARATING RARE EARTHS

L'invention concerne un procédé de séparation de terres rares, et plus particuliérement un procédé de séparation des terres rares légéres y compris l'yttrium, des autres terres rares. Ce procédé consiste à mettre en contact une solution aqueuse contenant les terres rares à séparer avec une solution organique comprenant un agent extractant pour faire passer les ions des terres rares lourdes ou autres terres rares depuis la phase aqueuse dans la phase organique puis à récupérer les terres rares lourdes par réextraction avec une solution aqueuse acide. L'agent extractant est un mélange d'au moins un acide carboxylique insoluble dans l'eau comprenant plus de 6 atomes de carbone avec au moins un composé neutre insoluble dans l'eau choisi dans le groupe des agents organophosphorés neutres ou des alcools ayant un nombre de carbone supérieur à 6. The invention relates to a process for the separation of rare earths, and more particularly to a process for the separation of light rare earths, including yttrium, from other rare earths. This process consists in bringing an aqueous solution containing the rare earths to be separated into contact with an organic solution comprising an extracting agent for passing the heavy rare earth ions or other rare earths from the aqueous phase into the organic phase and then recovering the earths. rare heavy by re-extraction with an acidic aqueous solution. The extractant is a mixture of at least one water-insoluble carboxylic acid comprising more than 6 carbon atoms with at least one water-insoluble neutral compound chosen from the group of neutral organophosphorus agents or alcohols having a carbon number greater than 6.

PROCESS FOR OBTAINING CERIC OXIDE AND CERIC OXIDE WITH NEW MORPHOLOGICAL CHARACTERISTICS

NEW COLLOIDAL DISPERSIONS OF A CERIUM IV COMPOUND IN AQUEOUS MEDIA AND THEIR PROCESS FOR OBTAINING SAME.

Process for the separation of cerium from other rare earths

PROCESS FOR OBTAINING CERIC OXIDE AND CERIC OXIDE WITH NEW MORPHOLOGICAL CHARACTERISTICS

La présente invention est relative à un procédé d'obtention d'un oxyde cérique à granulométrie contrôlée. L'invention vise également, à titre de produits industriels nouveaux, un oxyde cérique à nouvelles caractéristiques morphologiques. Le procédé de l'invention est caractérisé par le fait qu'il consiste à hydrolyser une solution aqueuse d'un sel de cérium IV en milieu acide, en présence d'une dispersion collodale aqueuse d'un composé de cérium IV; à séparer le précipité obtenu; puis à le soumettre à un traitement thermique. Ledit procédé permet d'obtenir un oxyde cérique à granulométrie fine et resserrée. The present invention relates to a process for obtaining a ceric oxide with a controlled particle size. The invention also relates, as new industrial products, to a ceric oxide with new morphological characteristics. The process of the invention is characterized in that it consists in hydrolyzing an aqueous solution of a cerium IV salt in an acidic medium, in the presence of an aqueous collodal dispersion of a cerium IV compound; in separating the precipitate obtained; then subjecting it to heat treatment. Said process makes it possible to obtain a ceric oxide of fine and constricted particle size.

PROCESS FOR TREATING ORES CONTAINING RARE EARTH.

L'invention concerne un procédé d'attaque d'un minerai contenant des terres rares. Ce procédé consiste en une attaque sulfurique d'un minerai dans le réacteur 1 puis reprise par une solution de nitrate de calcium en 3, et après élimination des insolubles en 5, récupération des terres rares par un procédé d'extraction liquide/liquide dans les batteries 6a, 6b. The invention relates to a method of attacking an ore containing rare earths. This process consists of a sulfuric attack on an ore in reactor 1 then taken up with a solution of calcium nitrate in 3, and after elimination of the insolubles in 5, recovery of the rare earths by a liquid / liquid extraction process in the batteries 6a, 6b.

Nitrogen oxide removal from waste gas - by contact with aq. tetra:valent cerium salt and nitrate ions in redox reactions

Nitrogen oxides (NOx) are recovered from a gaseous current by contacting it with an aq. salt of Ce IV and nitrate ions the NOx being recovered as nitrate ions and the Ce being reduced to CeIII. The Ce salt is the nitrate or the sulphate or the double nitrate of CeIV and NH4. It may be obtd. by anodic oxidn. of a soln. of a CeIII salt, esp. the salt obtd. after redn. in the process recycled to be reoxidised and used again. The process is used in the purificn. of waste gases. The gas stream is more readily purified than in prior art processes involving dilute nitric acid, and at lower cost.

PROCESS FOR OBTAINING CERIC OXIDE AND CERIC OXIDE WITH NEW MORPHOLOGICAL CHARACTERISTICS

PROCESS FOR SEPARATING RARE EARTHS

LA PRESENTE INVENTION CONCERNE UN PROCEDE DE SEPARATION DE TERRES RARES CONTENUES DANS DES MINERAIS OU DES CONCENTRES RICHES EN FLUOCARBONATES DE TERRES RARES NOTAMMENT DE BASTNAESITE. L'INVENTION A POUR OBJET UN PROCEDE PERFECTIONNE POUR SEPARER LE NEODYME, EVENTUELLEMENT EN ASSOCIATION AVEC LE PRASEODYME DES AUTRES TERRES RARES CONTENUS DANS LA BASTNAESITE, LEDIT PROCEDE ETANT CARACTERISE PAR LE FAIT QU'IL CONSISTE: -A EFFECTUER LA CALCINATION DE LA BASTNAESITE; A REALISER UNE LIXIVIATION MENAGEE DE LA BASTNAESITE CALCINEE A L'AIDE D'UNE SOLUTION D'ACIDE NITRIQUE; -A PROCEDER A LA SEPARATION ET A LA PURIFICATION DU NEODYME EVENTUELLEMENT EN ASSOCIATION AVEC LE PRASEODYME PAR EXTRACTION LIQUIDE-LIQUIDE. THE PRESENT INVENTION CONCERNS A PROCESS FOR SEPARATING RARE EARTHS CONTAINED IN ORES OR CONCENTRATES RICH IN FLUOCARBONATES FROM RARE EARTHS, IN PARTICULAR BASTNAESITE. THE OBJECT OF THE INVENTION IS A PERFECTED PROCESS FOR SEPARATING THE NEODYM, POSSIBLY IN ASSOCIATION WITH THE PRASEODYM OF THE OTHER RARE EARTHS CONTAINED IN THE BASTNAESITE, THIS PROCEDURE BEING CHARACTERIZED BY THE FACT THAT IT CONSISTS of: PERFORMING THE BASTNAESITE BASTNAESITE; TO CARRY OUT A CAREFUL LEACHING OF THE CALCINATED BASTNAESITE USING A NITRIC ACID SOLUTION; -A PROCEED WITH THE SEPARATION AND PURIFICATION OF THE NEODYME POSSIBLY IN ASSOCIATION WITH THE PRASEODYME BY LIQUID-LIQUID EXTRACTION.

COMPOSITION BASED ON CERIC OXIDE, PREPARATION AND USE.

DEHYDRATED RARE EARTH HALIDES AND PROCESS FOR PRODUCING THE SAME

NOVEL CERIUM IV COMPOUND AND PREPARATION METHOD THEREOF

PROCESS FOR RECOVERING SCANDIUM, YTTRIUM AND LANTHANIDES FROM TITANIUM ORE

New neodymium compounds, processes for their preparation and their applications

UN DES OBJETS DE L'INVENTION EST UN HYDROXYNITRATE DE NEODYME REPONDANT A LA FORMULE SUIVANTE: ND(OH) (NO), Z HO (I)DANS LAQUELLE: - 2,3 X 2,7 - 0,3 Y 0,7 - 1,5 Z 2,2. UN AUTRE OBJET DE L'INVENTION EST L'HYDROXYNITRATE DE NEODYME PREPARE PAR DESHYDRATATION DE L'HYDROXYNITRATE DE NEODYME DE FORMULE (I). L'INVENTION VISE EGALEMENT LES PROCEDES DE FABRICATION DES HYDROXYNITRATES DE NEODYME PRECITES ET LEURS APPLICATIONS COMME INTERMEDIAIRES DE FABRICATION DE L'OXYDE DE NEODYME.

PROCESS FOR TREATING RESIDUES CONTAINING RARE EARTHS AND COBALT

La présente invention a pour objet un procédé de traitement de résidus contenant au moins une terre rare et du cobalt. Le procédé de traitement des résidus selon l'invention est caractérisé par le fait qu'il consiste : - à opérer la mise en solution dudit résidu à l'aide d'acide nitrique; - à procéder à la séparation de la ou des terres rares, par extraction liquide-liquide en mettant en contact une phase aqueuse nitrique contenant les éléments à séparer et une phase organique contenant un agent d'extraction des terres rares constitué par au moins un composé organophosphoré neutre; - puis, à récupérer la ou les terres rares de la phase organique. Le procédé de l'invention est particulièrement bien adapté au traitement des résidus de fabrication des aimants samarium/cobalt en vue de récupérer le samarium et le cobalt. The subject of the present invention is a process for treating residues containing at least one rare earth and cobalt. The process for treating residues according to the invention is characterized in that it consists: - in dissolving said residue using nitric acid; - in carrying out the separation of the rare earth(s), by liquid-liquid extraction by bringing into contact a nitric aqueous phase containing the elements to be separated and an organic phase containing a rare earth extracting agent consisting of at least one compound neutral organophosphate; - Then, to recover the rare earth(s) from the organic phase. The process of the invention is particularly well suited to the treatment of the manufacturing residues of samarium/cobalt magnets with a view to recovering the samarium and the cobalt.

COMPOUND OF ADDITION OF A CARBOXYLIC ACID AND A RARE EARTH OR GALLIUM HALOGENOCARBOXYLATE, METHOD FOR THE PREPARATION THEREOF AND USE THEREOF

METHODS FOR SELECTIVE RECOVERY OF RARE EARTHS IN AQUEOUS ACID PHASES RESULTING FROM THE TREATMENT OF PERMANENT MAGNETS USED OR REBUIDED

Patent FR2482075A1

PROCEDE DE PREPARATION D'UN COMPOSE DE CERIUM DISPERSABLE EN MILIEU AQUEUX, ET SOLS ET GELS QUI EN RESULTENT. POUR PREPARER UN COMPOSE DE CERIUM DISPERSABLE, ON CHAUFFE UN HYDRATE D'OXYDE DE CERIUM-IV SENSIBLEMENT SEC, EN PRESENCE D'UN AGENT DE DESAGREGATION (ANION NITRATE, CHLORURE ETOU PERCHLORATE) POUR PROVOQUER LA DESAGREGATION DES CRISTALLITES AGREGES DANS CET HYDRATE ET PRODUIRE UN COMPOSE DE CERIUM DISPERSABLE ET SEC. LE COMPOSE OBTENU PEUT SERVIR A PREPARER UN GEL OU UN SOL. PROCESS FOR PREPARING A CERIUM COMPOUND DISPERSABLE IN AQUEOUS MEDIUM, AND RESULTING SOILS AND GELS. TO PREPARE A DISPERSABLE CERIUM COMPOUND, A SENSITIVELY DRY CERIUM-IV OXIDE HYDRATE IS HEATED, IN THE PRESENCE OF A DISAGGREGATION AGENT (ANION NITRATE, CHLORIDE AND OR PERCHLORATE) TO CAUSE THE DISAGREGATION OF THE HYDROGREGATED CRISTALLITES AND IN THIS AGGREGATED CRISTALLITES. A DISPERSABLE AND DRY CERIUM COMPOUND. THE COMPOUND OBTAINED CAN BE USED TO PREPARE A GEL OR A SOL.

CERIC OXIDE WITH NEW MORPHOLOGICAL CHARACTERISTICS AND METHOD OF OBTAINING THE SAME

LA CARACTERISTIQUE DE L'OXYDE CERIQUE DE L'INVENTION EST QU'IL PRESENTE UNE SURFACE SPECIFIQUE D'AU MOINS 855MG POUR UNE TEMPERATURE DE MESURE COMPRISE ENTRE 350C ET 450C, DE PREFERENCE 100 A 130MG POUR UNE TEMPERATURE DE MESURE COMPRISE ENTRE 400C ET 450C. IL EST OBTENU SELON UN PROCEDE QUI CONSISTE A HYDROLYSER UNE SOLUTION AQUEUSE D'UN SEL DE CERIUM IV EN MILIEU ACIDE, A FILTRER LE PRECIPITE OBTENU, A LE LAVER, EVENTUELLEMENT A LE SECHER PUIS A LE CALCINER. IL PEUT ETRE AVANTAGEUSEMENT UTILISE DANS LE DOMAINE DE LA CATALYSE COMME CATALYSEUR OU SUPPORT CATALYTIQUE. THE CHARACTERISTIC OF THE CERIC OXIDE OF THE INVENTION IS THAT IT HAS A SPECIFIC SURFACE OF AT LEAST 855MG FOR A MEASUREMENT TEMPERATURE BETWEEN 350C AND 450C, PREFERENTIALLY 100 TO 130MG FOR A MEASUREMENT TEMPERATURE BETWEEN 400C AND 450C . IT IS OBTAINED ACCORDING TO A PROCESS WHICH CONSISTS OF HYDROLYZING AN AQUEOUS SOLUTION OF A CERIUM IV SALT IN AN ACID MEDIUM, FILTERING THE PRECIPITE OBTAINED, WASHING IT, DRYING IT OPTIONALLY AND THEN CALCINING IT. IT CAN BE ADVANTAGEOUSLY USED IN THE FIELD OF CATALYSIS AS A CATALYST OR CATALYTIC SUPPORT.

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: R1 and R2 each indicate the same or different alkyl group; R3 indicates a hydrogen atom or an alkyl group; and R4 indicates a hydrogen atom or any given group other than an amino group bonded to the a carbon as an amino acid. Preferably, the general formula has a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit, or an N-methylglycine unit. Preferably, when extracting europium using the extraction agent, the pH is adjusted into the range of 2.0-3.0 inclusive, and when selectively extracting light rare earth metals, the pH is adjusted to 1.7-2.7 inclusive.

(EN) GROUP SEPARATION OF ACTINIDES FROM A HIGHLY ACIDIC AQUEOUS PHASE USING A SOLVING EXTRACTOR IN A RELAXING MEDIUM.

New additive compounds of carboxylic acids and halides or halogenocarboxylates with rare earths or gallium for preparation of new anhydrous addition compounds of these elements with nitrogen or oxygen donor compounds and catalysts

Addition compounds of carboxylic acids and rare earth or gallium halides or halogenocarboxylates of the same acids. Independent claims are included for: (1) preparation of the addition compounds; and (2) anhydrous addition compounds with N or O donor compounds; and (3) catalysts produced from carboxylic or halogenocarboxylate addition compounds.

Concentration of rare earth elements

PROCESS OF PREPARING A CERAMIC OXIDE WITH CONTROLLED GRANULOMETRY, CERAMIC OXIDE AND OXIDE OBTAINING PROCESS

Compounds

Abstract of the Disclosure The present invention relates to compounds and more particularly to cerium compounds. According to one aspect of the present invention there is provided a process for the preparation of a dispersible cerium compound which comprises heating a substantially dry cerium (IV) oxide hydrate in the presence of a deaggregating agent to cause deaggregation of aggregated crystallites in the cerium (IV) oxide hydrate and produce a dry dispersible cerium compound.

Cerium iv compound

The cerium (IV) compound of the invention corresponds to the general formula (I): Ce(OH)x(NO3)y.pCeO2.nH2O (I) in which: - x is such that x = 4-y - y is between 0.35 and 1.5 - p is greater than or equal to 0 and smaller than or equal to 2.0 - n is greater than or equal to 0 and smaller than or equal to approximately 20. <??>The cerium (IV) compound can be dispersed directly in water.

Fluid extraction

A method for extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical carbon dioxide, containing a chelating agent is described. The chelating agent forms chelates that are soluble in the fluid to allow removal of the species from the material. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent comprises a trialkyl phosphate, a trialkyl phosphate, an alkyl-aryl phosphate, a trialkylphosphine oxide, a triarylphosphine oxide, an alkyl-arylphosphine oxide, and mixtures thereof. The method provides an environmentally benign process for removing contaminants from industrial waste. The method is particularly useful for extracting actinides from acidic solutions, and the process can be aided by the addition of salts, such as nitrate salts, and modifiers, such as water and the lower alkyl alcohols and esters. The chelate and supercritical fluid can be regenerated, and the contaminant species recovered, to provide an economic, efficient process.

Process for obtaining a cerium oxide

Process for the treatment of ores containing rare earths

New neodymium compound and process for its preparation

The subject of the present invention is a neodymium hydroxynitrate corresponding to the following formula: Nd(OH)2NO3.1H2O) (I) <??>The invention is also targeted at the process for its preparation and its application especially as an intermediate in the manufacture of neodymium oxide.

Method for recovering rare earth elements from a solid mixture containing a halophosphate and a compound of one or more rare earth elements

Le procédé de l'invention pour la récupération des terres rares à partir d'un mélange solide contenant un halophosphate et au moins un composé d'une ou plusieurs terres rares comprend (a) une attaque acide du mélange; (b) l'addition d'une base pour remonter le pH à une valeur d'au moins 1,5; (c) une attaque du solide issu de l'étape (b) par une solution de soude ou de potasse; (d) une attaque acide du solide issu de l'étape (c) jusqu'à l'obtention d'un pH inférieur à 7, ce par quoi on obtient une phase solide et une phase liquide comprenant au moins un sel de terre rare et on sépare la phase solide de la phase liquide.

Process for preparing an oxychloride and/or oxide of actinide(s) and/or of lanthanide(s) from a medium comprising at least one molten salt

The invention relates to a process for manufacturing an oxychloride or oxide of actinide(s) and/or of lanthanide(s) from a chloride of actinide(s) and/or of lanthanide(s) present in a medium comprising at least one molten salt of chloride type comprising a step of bringing said chloride of actinide(s) and/or lanthanide(s) present in said medium comprising at least one molten salt of chloride type into contact with a wet inert gas.

Method for producing halide

Cerium dioxide with morphological characteristics, and process for its preparation

Method of purifying melt of rare-earth elements and yttrium chlorides

Processing rare earth sulphate solutions

A method of processing a purified rare earth sulphate solution, the method including the steps of: contacting the purified rare earth sulphate solution with sodium hydroxide to precipitate rare earths as rare earth hydroxide, including the addition of an oxidant to oxidise cerium contained in the rare earth hydroxide precipitate; and selectively leaching the rare earth hydroxide precipitate with hydrochloric acid to form a rare earth chloride solution and a residue.

Method for recovering scandium

Provided is a method for recovering scandium, which enables easy and efficient recovery of high-quality scandium from an acidic solution containing scandium. According to this method for recovering scandium, an acidic solution containing scandium is used and a scandium dissolution liquid after purification is obtained by a double sulfate precipitation step including the steps [A]-[C] described below, and scandium is then recovered from the thus-obtained scandium dissolution liquid. [A] A precipitation step wherein sodium sulfate is added into the acidic solution containing scandium, so that a precipitate of a scandium double sulfate is obtained [B] A neutralization step wherein pure water is added to the precipitate of a scandium double sulfate obtained in the precipitation step so as to dissolve the precipitate of a scandium double sulfate therein, and scandium hydroxide is obtained by adding a neutralizing agent into the thus-obtained dissolution liquid [C] A re-dissolution step wherein an acid is added to the scandium hydroxide obtained in the neutralization step, so that a scandium dissolution after purification, in which the scandium hydroxide is dissolved, is obtained

A method of manufacture of neodymium hydroxynitrate and uses of same

The purposes and preparation method of oxychlorination cerium semiconductor material with wide forbidden band

本发明公开了一种氧氯化铈宽禁带半导体材料的用途及其制备方法，所述用途为在制作蓝紫光发光器件中的应用，其化学组成式为CeOCl，空间群为P4/nmm，其晶胞参数为 α＝β＝γ＝90°，Z＝2。其制备方法主要步骤包括：将反应前躯体氯化铈和氧化镁混合制得的混合物预压制成体块；将上述制成的体块反应物放置到高压合成块中；将上述制得的高压合成块置于压机合成腔体中进行合成反应，合成温度不低于1300℃，压力不低于4GPa，合成反应时间不少于3.0分钟；上述合成反应完结后降温泄压，取出合成产物，用蒸馏水溶解去除副产物，即得到宽禁带半导体CeOCl晶体。本发明的制备方法简单可控，样品结晶良好。

PROCESS FOR TREATING RESIDUES CONTAINING RARE EARTHS AND COBALT

La présente invention a pour objet un procédé de traitement de résidus contenant au moins une terre rare et du cobalt. Le procédé de traitement des résidus selon l'invention est caractérisé par le fait qu'il consiste : - à opérer la mise en solution dudit résidu à l'aide d'acide nitrique; - à procéder à la séparation de la ou des terres rares, par extraction liquide-liquide en mettant en contact une phase aqueuse nitrique contenant les éléments à séparer et une phase organique contenant un agent d'extraction des terres rares constitué par au moins un composé organique insoluble dans l'eau comportant au moins une fonction amine primaire, secondaire, tertiaire ou quaternaire; - puis, à récupérer la ou les terres rares de la phase organique. Le procédé de l'invention est particulièrement bien adapté au traitement des résidus de fabrication des aimants samarium/cobalt en vue de récupérer le samarium et le cobalt. The present invention relates to a process for treating residues containing at least one rare earth and cobalt. The residue treatment process according to the invention is characterized by the fact that it consists: in carrying out the dissolution of said residue using nitric acid; - to proceed with the separation of the rare earth (s), by liquid-liquid extraction by contacting an aqueous nitric phase containing the elements to be separated and an organic phase containing a rare earth extractant consisting of at least one compound organic insoluble in water comprising at least one primary, secondary, tertiary or quaternary amine function; - then, in recovering the rare earth (s) from the organic phase. The process of the invention is particularly well suited to the treatment of residues from the manufacture of samarium / cobalt magnets with a view to recovering the samarium and the cobalt.

CERIUM OXYDE AND PROCEDURE FOR ITS MANUFACTURING

Ceric oxide with new morphological characteristics and method for obtaining same

A ceric oxide having a specific surface of at least 15 m 2 /g, measured after calcination at a temperature of between 800° and 900° C.

Recovery of rare earths from concentrates containing fluorine

The present invention relates to the recovery of rare earths, scandium, niobium, tantalum, zirconium, hafnium, titanium, and the like from ores or concentrates containing fluorine. More specifically, the ores or concentrates are pretreated by carbochlorination to convert the rare earths and other metals into their chlorides and then subjected to dilute hydrochloric acid leaching to recover the valuable rare earths and other metals from the leachate. Niobium, tantalum, zirconium, hafnium, and titanium can be recovered as their chlorides or oxychlorides from the gaseous products of carbochlorination, or converted into their oxides while simultaneously regenerating chlorine.

Composition based on ceric oxide, preparation and use

Dry chlorination process to produce anhydrous rare earth chlorides

A process for producing at least one rare earth chloride from an ore containing the at least one rare earth comprises: contacting the ore containing the at least one rare earth with reactants comprising a carbonaceous reducing agent, chlorine, and a boron-containing Lewis acid in a chlorination reactor to produce a gaseous product and a non-volatile chloride mixture comprising the at least one rare earth chloride.

Process for preparing an yttria aquasol

Process for the selective extraction of cerium from a cerium-containing fluorocarbonate, such as Bastnaesite ore or Bastnaesite concentrate

Process for producing mixed metal rare earth metal halide solutions in organic solvents

The present invention relates to lithium salt-containing rare earth halide solutions in aprotic solvents, processes for production thereof and also use thereof.

Method of recovering rare earths from a solid mixture containing a halophosphate and a rare earth compound and solid mixture suitable for said method

Patent JPH048106B2