Matches 151 - 200 out of 348 < 1 2 3 4 5 6 7 >


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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...
5429887 Process for treating AB5 nickel-metal hydride battery scrap  
A process for treating an AB5 Ni--MH battery to recover purified positive and negative electrode components of the battery is disclosed. An AB5 Ni--MH battery is placed in a mineral acid leach...
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 (NO3)y (OH)4-x-y, in which A is the anion of a...
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...
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...
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)...
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...
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...
5292489 Ternary silicon-rare earth nitrides and process for their preparation  
This invention provides a compound having the formula LnSi3 N5 wherein Ln is selected from the group consisting of scandium, yttrium, cerium, praseodymium, neodymium, promethium, samarium,...
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...
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,...
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...
5238489 Leaching/flotation scrap treatment method  
A method of treating a mixture of Nd2 Fe14 B and SmCo5 alloy scrap or waste particulates wherein the mixture is introduced to a bath of sulfuric acid solution to selectively dissolve the Nd2 Fe14...
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 Ce2 Si2 O7, in a reducing atmosphere. The invention provides...
5207995 Recovery of cerium from fluoride-containing ores  
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...
5180563 Treatment of industrial wastes  
A process for treating a sludge comprises digesting the waste material with a mixture of sulfuric acid and hydrogen peroxide to form an acidic digestion solution and a digestion residue. The...
5169610 Method for the purification of rare earth oxysulfide  
An efficient method is proposed for decolorizing a rare earth oxysulfide, which is usually slightly colored in grey as prepared by the sulfiding reaction of a rare earth oxide with hydrogen...
5160663 Method of reclaiming lamp phosphor  
A fluorescent lamp phosphor product is recovered from a degraded aqueous suspension by treating a separated solids portion of the suspension with nitric acid to solubilize a decomposed portion of...
5160367 Salt transport extraction of transuranium elements from lwr fuel  
A process of separating transuranium actinide values from uranium values present in spent nuclear oxide fuels which contain rare earth and noble metal fission products. The oxide fuel is reduced...
5152973 Synthesis of submicron powders under reduced oxygen pressure  
The invention process provides a metal oxide, or oxides of more than one more metal, wherein the oxides have a mean particle size less than 1 micron. The oxides are made by steps including (1)...
5147616 Magnesium transport extraction of transuranium elements from LWR fuel  
A process of separating transuranium actinide values from uranium values present in spent nuclear oxide fuels which contain rare earth and noble metal fission products. The oxide fuel is reduced...
5141723 Uranium chloride extraction of transuranium elements from LWR fuel  
A process of separating transuranium actinide values from uranium values present in spent nuclear oxide fuels containing rare earth and noble metal fission products as well as other fission...
5129945 Scrap treatment method for rare earth transition metal alloys  
A method of treating rare earth-transition metal alloy scrap involves in one embodiment dissolving the scrap in aqueous sulfuric acid solution, reacting the solution with a hydroxide of an alkali...
5049363 Recovery of scandium, yttrium and lanthanides from titanium ore  
A process for extracting scandium from titanium ore includes the steps of: feeding the titanium ore to a fluidized bed chlorinator at about 1000° C. to produce a vaporous (generally titanium and...
5045289 Formation of rare earth carbonates using supercritical carbon dioxide  
The invention relates to a process for the rapid, high yield conversion of select rare earth oxides or hydroxides, to their corresponding carbonates by contact with supercritical carbon dioxide.
5039336 Recovery of scandium, yttrium and lanthanides from zircon sand  
This is a process for extracting scandium from zircon ore. It utilizes feeding zircon sand to a fluidized bed chlorinator at about 1000° C. to produce a vaporous (principally zirconium and silicon...
5034201 Recovery of rare earth values from gypsum  
Rare earth values are recovered from gypsum starting material by (i) dissolving such gypsum in water and separating therefrom the water-insoluble fractions which contain the rare earth elements...
5030424 Recovery of rare earth elements from Bayer process red mud  
A process for the recovery of rare earth elements from Bayer Process red mud includes the following steps: (a) digesting red mud containing rare earth elements with a dilute acid solution, e.g....
5023070 Process for obtaining a ceric oxide  
The present invention concerns a process for obtaining a ceric oxide, and, more precisely, a process for increasing and stabilizing at high temperature the specific surface area of a ceric oxide....
5021397 Synthesis of ceramic superconductor CPO from xenotyme  
A process for the preparation of a superconductor of the type AB2 Cu3 O7-x, wherein A is a mixture of rare earths, B is an alkaline earth metal and x is less than one, comprising the treatment of...
5015452 Process for synthesis of uniform colloidal particles of rare earth oxides  
An improved process for the preparation of monodispersed spherical colloidal particles from rare earth salts is disclosed. These colloidal particles are obtained in this process by homogeneous...
5011665 Nonpolluting recovery of rare earth values from rare earth minerals/ores  
Rare earth values are nonpollutingly recovered from a rare earth mineral/ore, especially one containing but minor amounts of the rare earths, by (a) leaching/decomposing such rare earth...
5006318 Particulate compositions of rare earth oxide and method of making same  
Particulate compositions of rare earth oxides wherein the particles are present in the form of single crystals of homogeneous size and morphology, the dimensions of which are less than or equal to...
5000927 Method of regulating a purex solvent extraction process  
The "Purex" solvent extraction and separation process for recovering uranium from scrap material or spent fuel containing gadolinia is modified by treating uranium containing scrap or spent fuel...
4999180 Neodymium hydroxynitrate  
A neodymium hydroxynitrate, readily calcined into, e.g., neodymium oxide, Nd2 O3, has the formula (I): Nd(OH)2 NO3.1H2 O (I)
4988487 Process for recovering metal values such as scandium, iron and manganese from an industrial waste sludge  
A process for eliminating an industrial waste sludge by converting its metal values into useful products involves the selective leaching of Mn, divalent Fe, and other valuable metals, such as Sc,...
4980139 Method for removing chlorine from a gas stream  
Chlorine is removed from a gas stream by contacting the stream with a pulverized, oxidized bastnasite ore in the presence of water. The invention is particularly applicable to the processing of...
4980141 Hexagonal-bipyramid crystalline scandium oxide powder and a process for preparing the same  
Hexagonal-bipyramid crystalline scandium oxide powder and a process for preparing the same are disclosed. The process comprises forming scandium oxalate from an acid aqueous solution containing...
4976939 Processing of rare earth ores  
Rare earth hydroxides are recovered from the rare earth ores, e.g., monazite, xenotime and/or bastnasite, by treating the ore with an aqueous solution of an alkali metal hydroxide, under agitation...
4973455 Recovery of lanthanides  
Lanthanide components are recovered from a fluorine-containing material by a method which comprises mixing the material with silica and sulfuric acid, heating the mixture to induce a reaction and...
4965057 Process for producing morphologically improved ceric oxide particulates  
Morphologically improved ceric oxide particulates having a grain size distribution such that the mean diameter of the aggregates thereof ranges from 0.2 to 1 μm, are conveniently prepared by (i)...
4954293 Separation of thorium and rare earth values from fluoride concentrates thereof  
Thorium and rare earth values are separated from a fluoride concentrate thereof, by decomposing such concentrate with aqueous sodium hydroxide under conditions such that the amount of sodium...
4902655 Preparation of precursors for yttrium-containing advanced ceramics  
This is a process for making precursors for tetragonally stabilized ceramic. It utilizes fluidized bed chlorination of a rare earth ore (e.g. xenotime or monazite) a separation of yttrium chloride...
4886624 Colloidal alcohol-dispersible association complexes of ceric dioxide and a hydroxyphenyl carboxylic acid  
A process is provided for preparing colloidal dispersions of alcohol-dispersible association complexes of ceric dioxide and a hydroxyphenyl carboxylic acid having from about seven to about twenty...
4885145 Method for providing oxygen ion vacancies in lanthanide oxides  
A method for desulfurization of fuel gases resulting from the incomplete combustion of sulfur containing hydrocarbons whereby the gases are treated with lanthanide oxides containing large numbers...
4863882 Rare earth oxysulfide ceramics  
Rare earth oxysulfide ceramic material prepared by covering the material with a foil of a metal selected from the group consisting of molybdenum, tungsten, platinum, and rhenium, sealing it into...
4859432 Novel ceric oxide particulates and process of making  
Morphologically improved ceric oxide particulates have a BET specific surface, measured after calcination at a temperature of from 350° to 450° C., of at least 100 m2 /g, a total pore volume of at...
4857280 Method for the regeneration of sulfided cerium oxide back to a form that is again capable of removing sulfur from fluid materials  
A method for the regeneration of sulfur containing cerium compounds formed by the desulfurization of fluid materials containing sulfur with cerium oxide back to its original form, CeO2, wherein...
4857296 CeO catalytic desulfurization of industrial gases  
The desulfurization of industrial gases by the catalytic conversion of contaminating sulfur values therein, comprising, e.g., either Claus process or hydrolysis of organosulfur compounds, is...
4844873 Separation and recovery of solids from liquids containing them using the ionic flotation process  
Improvement to the separation and recovery of solids from liqiuds containing them, and using a ionic flotation process, implementing an installation characterized in that it comprises at least a...

Matches 151 - 200 out of 348 < 1 2 3 4 5 6 7 >