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6455018 |
Recovery of precious metal and other values from spent compositions/materials
Precious metal values, e.g., platinum, palladium and rhodium, and, optionally, other valuable elements, e.g., one or more rare earths and cerium in particular, are recovered from a wide variety of...
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6436358 |
Metals removal from spent salts
A method and apparatus for removing metal contaminants from the spent salt of a molten salt oxidation (MSO) reactor is described. Spent salt is removed from the reactor and analyzed to determine...
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6365007 |
Photocatalysts for the degradation of organic pollutants
A photocatalyst is provided consisting of TiO 2 doped with at least one lanthanide metal oxide. The photocatalyst may be prepared by forming a titanium-containing gel and then drying the gel and...
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6319429 |
Oxygen sensitive resistance material
Oxygen sensitive resistance materials for use with oxygen sensors, in particular λ probes are described. These materials are based on the fact that with complex metal oxides it is possible--by...
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6245305 |
Method of separating and purifying gadolinium-153
The present invention is an improvement to the method of separating and purifying gadolinium from a mixture of gadolinium and europium having the steps of (a) dissolving the mixture in an acid; (b)...
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6238566 |
Multi-stage solvent extraction of metal value
Proposed is an improvement in a multi-stage solvent extraction process of a metal value such as rare earth elements from an acidic feed solution containing the metal value in the form of a...
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6221473 |
Rare-earth and alkali sulphide, method for preparing same and use thereof as a pigment
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6214301 |
Hafnium radioisotope recovery from irradiated tantalum
Hafnium is recovered from irradiated tantalum by: (a) contacting the irradiated tantalum with at least one acid to obtain a solution of dissolved tantalum; (b) combining an aqueous solution of a...
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6200377 |
Process for beneficiation of mixtures of mineral particles
An improved process for the beneficiation of mixtures of mineral particles (such as kaolin clays) containing minerals which chelate with hydroxamates. The use of a silicon-containing compound in...
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6110433 |
Process for the recovery of metals from used nickel/metal/rare earth hydride storage batteries
The invention relates to a process for recovering metals from used nickel/hydride storage batteries, in which storage battery scrap has been mechanically comminuted and divided into at least a...
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5980841 |
Method for recovering reusable elements from rare earth-nickel alloy
A method for recovering reusable elements including rare earth elements from a rare earth-nickel alloy is disclosed, including the steps of: preparing a slurry of the rare earth-nickel alloy, ...
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5981445 |
Process of making fine ceramic powders from aqueous suspensions
The new preparation process for making fine high specific surface ceramic powders suitable as catalysts or precursors for ceramics uses lanthanum (or other rare earth lanthanide) oxide as one of...
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5966584 |
Method of separating trivalent actinides from trivalent lanthanides
Trivalent actinides can be separated from trivalent lanthanides in aqueous solutions at H + concentrations of 2 mol/l to 0.001 mol/liter by extraction with bis(aryl)dithiophosphinic acid and a...
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5945342 |
Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation
The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that...
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5911921 |
Non-stoichiometric ytterbium phosphate powder of low infrared reflectivity
Proposed is a powder of ytterbium phosphate having a non-stoichiometric phosphorus to ytterbium molar ratio of 1.08 to 2.0 and having a specified average particle diameter and specified diameter of...
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5874374 |
Method for producing engineered materials from salt/polymer aqueous solutions
A method for producing engineered materials from salt/polymer aqueous solutions in which an aqueous continuous phase having at least one metal cation salt is mixed with a hydrophilic organic...
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5846912 |
Method for preparation of textured YBa.sub.2 Cu.sub.3 O.sub.x superconductor
The present invention relate to textured YBa 2 Cu 3 O x (Y-123) superconductors and a process of preparing them by directional recrystallization of compacts fabricated from quenched YBCO powders...
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5795554 |
Method for preparing the oxysulfides of rare earth elements
The present invention discloses a method for the catalytic reduction of sulfur dioxide, for example in flue gas, by carbon monoxide using lanthanum oxysulfide as the active catalyst. The catalyst...
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5787332 |
Process for recovering tantalum and/or niobium compounds from composites containing a variety of metal compounds
A process for treating composite materials comprising metals and having significant radioactivity for separation into concentrated individual products is provided. The process of the invention...
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5756056 |
Process for recovering rare earth metal from oxide ore by concentration and separation
A process for recovering scandium economically with high efficiency by concentration and separation from an oxide ore containing nickel and a small amount of scandium as well as a large amount of...
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5730874 |
Extraction of metals using supercritical fluid and chelate forming legand
A method of extracting metalloid and metal species from a solid or liquid material by exposing the material to a supercritical fluid solvent containing a chelating agent is described. The chelating...
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5728355 |
Method for recovering reusable rare earth compounds
A method for recovering reusable rare earth compounds such as rare earth oxides, rare earth fluorides, or rare earth metals from rare earth alloy scrap in an effective and safe manner. The method...
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5716547 |
Stable colloidal dispersions of rare earth compounds
Stable colloidal dispersions, in water, of rare earth compounds, e.g., yttric rare earth compounds, are produced by (a) reacting, in an aqueous reaction medium, a rare earth oxide with a controlled...
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5705100 |
Resistive material, and resistive paste and resistor comprising the material
An organic vehicle is added to and kneaded with a solid component comprising from 60 to 95% by weight of a resistive material having a composition of La x Sr 1 -x CoO 3 (x is from 0.40 to 0.60)...
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5698483 |
Process for preparing nanosized powder
A process for producing nano size powders comprising the steps of mixing an aqueous continuous phase comprising at least one metal cation salt with a hydrophilic organic polymeric disperse phase,...
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5690889 |
Production method for making rare earth compounds
A method of making a rare earth compound, such as a earth-transition metal permanent magnet compound, without the need for producing rare earth metal as a process step, comprises carbothermically...
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5644037 |
Method for the preparation of polyhedral particles of a rare earth ammonium double oxalate
Disclosed is a method for the preparation of particles of a rare earth ammonium double oxalate by mixing a first aqueous solution of ammonium oxalate and a second aqueous solution of a...
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5606724 |
Extracting metals directly from metal oxides
A method of extracting metals directly from metal oxides by exposing the oxide to a supercritical fluid solvent containing a chelating agent is described. Preferably, the metal is an actinide or a...
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5597538 |
Process to remove rare earths from spent nuclear fuel
The present invention relates to a process for removing rare earth elements (RE) from spent nuclear fuel. The spent nuclear fuel is subjected to an oxidation step at a temperature of between about...
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5595714 |
Recovery of gadolinium and its complexing agents from aqueous solutions containing their complexes
The invention refers to a novel process for the recovery of gadolinium and its complexing agent from aqueous solutions containing their complexes and/or salts of said complexes.
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5587142 |
Method of dissolving metal oxides with di- or polyphosphonic acid and a redundant
A method of dissolving metal oxides using a mixture of a di- or polyphosphonic acid and a reductant wherein each is present in a sufficient amount to provide a synergistic effect with respect to...
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5534160 |
Method for the re-treatment of residue generated from the removal of fluorine dissolved in waste water
A method for the re-treatment of residue generated in the course of removing fluorine from waste water. The method comprises the step of: drying the residues consisting of rare earth fluorides,...
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5492680 |
Separation of scandium from tantalum residue using fractional liquid-liquid extraction
A process for separating scandium from an aqueous solution comprised of a first group of metals, scandium and a second group of metals includes the steps of: (a) providing a scandium-containing...
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5461013 |
Process for the preparation of lithium stanates doped with transition metal cations
A process for the preparation of ceramic material Lithium stannate doped with a transition metal for a humidity sensor mixes a salt of Lithium with SnO 2 in dry condition, thereafter mixes in wet...
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5439656 |
Method for the preparation of a rare earth oxide powder
An improved method is proposed for the preparation of a powder of a rare earth oxide having good dispersibility containing no agglomerates of particles even without undertaking disintegration...
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5433931 |
Recovery of cerium
Recovery of cerium values from fluoride-containing ores such as bastnasite is enhanced. The ore is ground, roasted, and leached with dilute hydrochloric acid to produce an ore concentrate. The...
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5429887 |
Process for treating AB.sub.5 nickel-metal hydride battery scrap
A process for treating an AB 5 Ni--MH battery to recover purified positive and negative electrode components of the battery is disclosed. An AB 5 Ni--MH battery is placed in a mineral acid leach...
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5429724 |
Neodymium recovery process
The present invention is a method of recovering neodymium (Nd) from waste by-products of rare earth magnet manufacture. Two main waste by-products, NdFeB swarf and NdFeB slag, are treated by two...
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5389298 |
Colloidal dispersions of cerium (IV) compounds in aqueous media
Weakly acidic colloidal dispersions of cerium (IV) compounds in aqueous media, the colloidal solids of which having the general formula Ce(A) x (NO 3 ) y (OH) 4 -x-y, in which A is the anion of a...
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5376304 |
Ceric oxide sol
As an ultraviolet absorbent material, ceric oxide sol which can be widely used in many fields using various solvent materials is obtained. An anionic aqueous sol is obtained by adding phosphoric...
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5368736 |
Process for the separation and purification of yttrium-90 for medical applications
An extraction chromatographic method for the preparation of 90 Y of high chemical and radiochemical purity is disclosed. After an initial purification of a 90 Sr stock solution and a suitable...
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5338520 |
Recovery of neodymium/didymium values from bastnaesite ores
Neodymium or didymium values are selectively recovered from bastnaesite ores, essentially to the exclusion of cerium and trace amounts of thorium, by (i) calcining the bastnaesite ore, (ii)...
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5336450 |
Process to remove rare earth from IFR electrolyte
The invention is a process for the removal of rare earths from molten chloride electrolyte salts used in the reprocessing of integrated fast reactor fuel (IFR). The process can be used either...
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5332558 |
Rare earth oxide powder and method for the preparation thereof
An improved method is proposed for the preparation of a powder of rare earth oxide of which the particles have a predominantly polyhedral configuration with a relatively large particle size to be...
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5292489 |
Ternary silicon-rare earth nitrides and process for their preparation
This invention provides a compound having the formula LnSi 3 N 5 wherein Ln is selected from the group consisting of scandium, yttrium, cerium, praseodymium, neodymium, promethium, samarium,...
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5290337 |
Pyrochemical processes for producing Pu, Th and U metals with recyclable byproduct salts
In the pyrochemical reduction of uranium dioxide or other actinide metal oxides by reaction with magnesium, magnesium oxide byproduct is produced. The use of a salt flux comprising magnesium...
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5279801 |
Production of binary rare earth/sulfur or transition metal/sulfur compounds
Binary rare earth/sulfur or transition metal/sulfur compounds, e.g., the higher sulfides or sesquisulfides of the rare earths, are prepared by confinedly reacting either a rare earth compound,...
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5248328 |
Process for preparing rare earth containing hard alloy
This invention discloses a process for preparing rare earth containing hard alloy, comprising preparing metal carbide powder containing rare earth metals or cobalt powder containing rare earth...
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5238489 |
Leaching/flotation scrap treatment method
A method of treating a mixture of Nd 2 Fe 14 B and SmCo 5 alloy scrap or waste particulates wherein the mixture is introduced to a bath of sulfuric acid solution to selectively dissolve the Nd 2...
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5236876 |
Body of cerium-doped quartz glass
A body of cerium-doped quartz glass is manufactured by melting together silicon oxide and a cerium (III) silicate compound, preferably Ce 2 Si 2 O 7 , in a reducing atmosphere. The invention...
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