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7195745 |
Method of preparing a product based on phosphate of thorium and/or actinide(s)
The invention relates to a process for the preparation of a product based on a phosphate of at least one element M(IV), for example of thorium and/or of actinide(IV)(s). This process comprises the...
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7011798 |
Process for reprocessing spent nuclear fuels by utilizing phenomenon of cocrystallization
A reprocessing process of spent nuclear fuels for roughly separating U and U—Pu from FP, TRU and the like in a nitric acid solution of spent nuclear fuels by utilizing phenomenon of...
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6843970 |
Process for recovering metal values by dissolving them in a sulfuric acid solution containing a carbon source and a reducing agent
A process for recovering metal values from a metal containing material including the metal values comprising digesting the metal containing material in a sulfuric acid solution comprising sulfuric...
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6169221 |
Decontamination of metal
A process for the decontamination of radioactively contaminated metal which comprises contacting the metal with a decontamination reagent solution containing an organic acid and an oxidising agent,...
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6159435 |
Leaching of mineral ores
A process for oxidation of ferrous ions in solution, and more particularly a process for improved base metal and/or uranium leaching from ores, concentrates or tailings using ferric ion as an...
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6033636 |
Method of recovering uranium and transuranic elements from spent nuclear fuel
The steps for recovering uranium and transuranic elements are simplified, and the generation of waste solvent and waste materials is suppressed. Spent nuclear fuel is dissolved in nitric acid...
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5826162 |
leaching of titaniferous materials
A process for facilitating removal of one or more impurities from titaniferous material containing the impurities in a form which is highly soluble in acid. The material is in turn leached with a...
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5640701 |
Method for remediating soil containing radioactive contaminants
Soil comprising small soil particles, clay and silt particles, humus, fine vegetation, and contaminated with soluble or insoluble radioactive species is treated by first introducing an aqueous...
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5437848 |
Recovery of metal values from process residues
A process for recovering metal and acid values from a source material containing metallic fluorides comprises digesting the source material in sulfuric acid to form a slurry, separating a fluoride...
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5384104 |
Uranium carbonate extraction process
A process for extracting uranium from uranium-containing waste residues. The process dissolves the residue in hot nitric acid, and precipitates the resulting solution with sodium carbonate/sodium...
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5344623 |
Process for the extraction of strontium from acidic solutions
The invention is a process for selectively extracting strontium values from aqueous nitric acid waste solutions containing these and other fission product values. The extractant solution is a...
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5322644 |
Process for decontamination of radioactive materials
A process for decontaminating radioactive material comprises the step of contacting the material with a dissolving composition to dissolve the contaminants in the material, said composition...
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RE34613 |
Process for decontaminating radioactively contaminated metal or cement-containing materials
Contaminated surface layers are decontaminated by treatment with an aqueous fluorine base-containing decontamination solution. The aqueous decontamination solution contains 0.05 to 50 Mol of...
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5229086 |
Removal of molybdenum from uranium-bearing solutions
A process for removing molybdenum from uranium bearing solutions reduces molybdenum contamination of uranium product. The process employs solvent extraction techniques to remove molybdenum by using...
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5084253 |
Method of removing niobium from uranium-niobium alloy
A method of removing niobium from a uranium-niobium alloy includes dissolving the uranium-niobium alloy metal pieces in a first aqueous solution containing an acid selected from a group consisting...
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5077020 |
Metal recovery process using waterglass
Sodium silicate (waterglass) is added to a waste process stream containing metal to form a waterglass sludge containing the metal contaminants. The waterglass sludge matrixed with the metal is...
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5023059 |
Recovery of metal values and hydrofluoric acid from tantalum and columbium waste sludge
A metallurgical processing system for economically recovering metal values, such as columbium, tantalum, thorium, and uranium from dilute source solids, such as digestion sludges, by a series of...
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5017345 |
Method of producing uranium (IV) fluoride
In a method of producing uranium (IV) fluoride, a feedstock comprising uranium metal or alloy is dissolved in hydrochloric acid and hydrofluoric acid to produce a clear solution. The solution is...
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4968504 |
Recovery of scandium and uranium
The separation of uranium, iron and scandium is achieved by the following process wherein a material containing these values is dissolved in mineral acid to form an aqueous solution, thereafter, an...
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4933113 |
Process for the processing of contaminated boric acid
Contaminated surface layers are decontaminated by treatment with an aqueous fluorine base-containing decontamination solution. The aqueous decontamination solution contains 0.05 to 50 Mol of...
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4839101 |
Process for improving the effectiveness of the removal of zirconium from a nuclear fuel and/or fertile material solution
The invention relates to a process for improving the effectiveness of the removal of zirconium from an aqueous, zirconium-containing nuclear fuel and/or fertile material solution in nitric acid in...
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4834793 |
Oxidation process for releasing metal values in which nitric acid is regenerated in situ
An oxidation process for releasing a metal of interest in an ore is described. The process is especially useful for releasing a metal of interest entrapped in a refractory ore. The process...
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4828759 |
Process for decontaminating radioactivity contaminated metallic materials
Contaminated surface layers are decontaminated by treatment with an aqueous fluorine base-containing decontamination solution. The aqueous decontamination solution contains 0.05 to 50 Mol of...
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4769180 |
Process for separately recovering uranium and hydrofluoric acid from waste liquor containing uranium and fluorine
A process for separately recovering uranium and hydrofluoric acid from a waste liquor containing uranium and fluorine comprises a neutralizing precipitation step wherein a magnesium compound is...
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4764353 |
Leaching of uranium ore
Uranium is leached from water slurries of uranium ore by incorporating a mixture of sulfur dioxide and air therein to provide the oxidizing and acidifying requirements to accomplish leaching.
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4756853 |
Process for the conversion into usable condition of actinide ions contained in the solid residue of a sulfate reprocessing process for organic, actinide-containing radioactive solid waste
A process for the conversion into a usable condition of actinide ions contained in the solid residue of a sulfate reprocessing process for organic actinide-containing radioactive solid waste, which...
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4744960 |
Process for the separation of rare earths and uranium of a UF.sub.4 concentrate and for putting them into useful form
The present invention relates to a proces for separating rare earths and uranium from a UF 4 concentrate and for placing them into useful form, comprising attacking the UF 4 concentrate with...
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4689178 |
Method for magnesium sulfate recovery
A method of obtaining magnesium sulfate substantially free from radioactive uranium from a slag containing the same and having a radioactivity level of at least about 7000 pCi/gm. The slag is...
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4656011 |
Process of treating nuclear fuel
In the process for treating irradiated nuclear fuel to effect separation of uranium plutonium other higher actinides, and fission products, in which nitric acid treatment, followed by solvent...
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4649031 |
Process for recovering rare metals from the combustion residue of coal by digestion
The invention relates to a method for recovering rare metals from the combustion residues of various coals, in particular brown coals. The recovery is performed by digestion, more particularly by...
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4643882 |
Process for recovery by a solvent of the uranium present in phosphoric acid
A process for the recovery of the uranium present in phosphoric acid produced by a wet process in (A) by means of a suitable solvent (L 9 ), which is carried out after separation of the gypsum in...
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4636369 |
Essentially complete recovery of uranium, yttrium, thorium and rare earth values from phosphate rock during wet-process production of phosphoric acid therefrom
The uranium, yttrium, thorium and rare earth values contained in a phosphate rock are essentially totally recovered therefrom by, during the wet-process preparation of phosphoric acid from said...
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4636367 |
Removal of radium from aqueous liquids
A process for separating radium-226 from an aqueous liquid by adding a precipitant to the liquid. The liquid, including the precipitant, is passed upwardly through a particulate bed to assist...
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4626416 |
Insoluble chelating compositions
The present invention relates to insoluble compositions, which are capable of removing metal (e.g. selectively) from solution (e.g. Fe 3 + from a liquid nutrient medium so as to lower the Fe 3 + ...
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4609533 |
Process for selective separation of plutonium from uranium and other metals
A process for selectively separating plutonium from uranium and other metals is disclosed wherein, in order to precipitate and remove the pertaining complexes, use is made of a sufficient quantity...
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4587108 |
Flocculation of acid leach slurries
The rate of separation of insoluble material from an acid-leached uranium slurry is improved by adding a flocculating agent that is a combination of polyacrylamide and a copolymer of acrylamide...
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4576802 |
Method of dissolving impure uranium tetrafluoride
A method of dissolving impure uranium tetrafluoride in a hot state in a nitric acid solution in the presence of an aluminum compound. For the purpose of obtaining a uranyl nitrate solution which...
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4572581 |
In-situ recovery of mineral values
Mineral values, particularly uranium, are recovered from subsurface earth formations containing the same, as well as cations which form precipitates with sulfuric acid leach solutions, by injecting...
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4514378 |
Process for recovering uranium from spent shale
A process for the recovery of uranium from spent shale by treating the spent shale with a compound selected from the group consisting of methanol, a mixture of methanol and water, and a mixture of...
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4486392 |
Process for the selective separation of uranium from accompanying metals
Disclosed is a process for the selective separation of uranium from metals accompanying it in a uranium-containing ore, comprising the steps of preparing a uranium-containing solution; adding to...
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4464345 |
Method of precipitating contaminants in a uranium leachate using ferri ions, complexing agent, and pH control
The present invention relates to a process for recovery of uranium from a carbonate lixiviant additionally containing other contaminants such as molybdenum and silica, by adjusting the pH of the...
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4452490 |
Treatment of subterranean uranium-bearing formations
A process is described for improving yields and leaching rates of mineral values in highly reducing uranium-bearing formations, while minimizing deleterious environmental impact, by injecting an...
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4451438 |
Process for recovering niobium and/or tantalum metal compounds from such ores further containing complexes of uranium, thorium, titanium and/or rare earth metals
A process for recovering one or more non-radioactive transition metal compounds from an ore containing one or more compounds of said transition metal or metals and further containing at least one...
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4447403 |
Method for autoclave oxidation of ion species aqueous solutions
An improved method and apparatus for effecting a substantial reduction in retention time of oxidation processes by the autoclave oxidation of ion species dissolved in aqueous solutions. In one...
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4446116 |
Process for recovering niobium and/or tantalum compounds from such ores further containing complexes of uranium, thorium, titanium and/or rare earth metals
A process for recovering one or more nonradioactive transition metal compounds from an ore containing one or more compounds of said transition metal or metals and further containing at least one...
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4431611 |
Mixtures of organic phosphonates and anionic polymers to improve acid extraction of uranium
A method of improving the acid leaching of uranium ores which comprises adding to such ores while they are being leached between 0.01-2 lb. per ton of a composition comprising: a. aminotris...
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4431610 |
Method of recovering uranium from wet process phosphoric acid
An economically advantageous method of recovering uranium from a wet process phosphoric acid solution through the steps of making hemihydrate gypsum contact with the acid solution thereby...
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4427641 |
Method of recovering uranium from wet process phosphoric acid with enhanced content of uranium
In preparing wet process phosphoric acid by decomposing a phosphate rock containing uranium with sulfuric acid and phosphoric acid on condition that hemihydrate gypsum is formed in an acid solution...
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4424196 |
Phosphohemihydrate process for purification of gypsum
A wet process for producing phosphoric acid and phosphohemihydrate by acidulation of phosphate rock. A strong phosphoric acid is obtained with concomitant production of an improved calcium sulfate...
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4421731 |
Process for purifying phosphogypsum
A process for reducing radioactive contamination of phosphogypsum. Phosphogypsum containing radioactive material is calcined to form hemihydrate crystals carrying the radioactive contaminants, and...
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