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7597862 |
Process for radioisotope recovery and system for implementing same
A method of recovering daughter isotopes from a radioisotope mixture. The method comprises providing a radioisotope mixture solution comprising at least one parent isotope. The at least one parent...
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7572418 |
Process to obtain titanium concentrates with high contents of TiO2 and low contents of radionuclide elements from anatase mechanical concentrates
A process for production of titanium concentrate with low contents of radionuclide elements from anatase mechanical concentrates. The process involves calcination in air and reduction with hydrogen...
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7527772 |
Ultrasonic counter-current screw extractor for uranium recovery and process therefore
An apparatus and method to remove uranium from a body of material wherein the method includes the steps of depositing the body of solid material in an ultrasonic extractor and depositing an amount...
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7341700 |
Method for recovery of metals from metal-containing materials using medium temperature pressure leaching
The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials using controlled, super-fine grinding and medium temperature...
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7255798 |
Recycling of used perfluorosulfonic acid membranes
A method for recovering and recycling catalyst coated fuel cell membranes includes dissolving the used membranes in water and solvent, heating the dissolved membranes under pressure and separating...
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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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7118718 |
Gypsum decontamination process
A process for reducing a level of radionuclei in a phosphogypsum material having a radioactive contaminant is provided, wherein the process includes the steps of: (a) mixing the phosphogypsum...
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6852233 |
Metal-collecting apparatus and method for elution and recovery of metal from metal-collecting material
An object of the present invention is to provide a structure of a metal collecting material for use in seawater or river water or industrial wastewater to give the most excellent adsorption...
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6740298 |
Apparatus for dissolving nuclear fuel
A nuclear fuel dissolution apparatus which comprises a perforated sloping ramp contained within a process chamber for containing solvent for the fuel, a pulsation member which in use creates pulses...
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6652661 |
Radioactive decontamination and translocation method
A method for removing a wide variety of radioactive contaminants from a contaminated surface sufficient for the surface to be classified as a low-level waste or as free release. Contaminated...
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6641641 |
Method for producing metal or metal compound comprising process of treating with fluorine and adjusted raw material used therein
An object of the present invention is to provide a method for preventing concentration of a radioactive substance in a generated extraction residue in a method of producing tantalum, niobium, or a...
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6623712 |
Method for dissolving plutonium or a plutonium alloy and converting it into nuclear fuel
The present invention relates to a process to dissolve plutonium or a plutonium alloy, by placing it in contact with an aqueous dissolution mixture, wherein said dissolution mixture comprises...
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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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6235252 |
Method for recovering nitrate ions as nitric acid from nuclear industry effluents
A method for recovering nitrate ions as nitric acid from nuclear industry effluents by thermally decomposing the nitrate ions in solution, and recovering the NO x vapors generated by the heat...
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6231683 |
Method for cleaning radioactively contaminated material
Radioactively contaminated material is cleaned by contacting the material with a decontaminating liquid comprising an aqueous solution of nitric acid containing an NOx generating agent. The NOx...
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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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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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5910621 |
Treatment of titaniferous materials
A process for facilitating the removal of impurities e.g. radionuclides, such as uranium and thorium, and/or one or more of their radionuclide daughters, from titaniferous material includes...
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5881359 |
Metal and fluorine values recovery from fluoride salt matrices
The process for converting feed materials of high mineral content containing primary metal values and fluorine values to the primary metal or useful compounds thereof and to fluorine values or...
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5851500 |
Removal of uranium contamination from magnesium fluoride slag
Magnesium fluoride slag contaminated with metallic uranium or uranium compounds is treated by digestion with potassium hydroxide to soluble potassium fluoride and insoluble magnesium hydroxide. The...
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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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5745835 |
Process and apparatus for dissolving a mixture of oxides of uranium and of plutonium
A process and apparatus for dissolving a mixed oxide or mixture of oxides of uranium and plutonium. The powder is added with nitric acid to a chamber to dissolve uranium oxide, and the solution is...
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5686052 |
Process for the treatment of nuclear targets and/or fuels based on metallic aluminium by tetramethylammonium hydroxide solutions
The invention relates to a process for the processing of nuclear targets and/or fuels based on metallic aluminium by dissolving with the aid of aqueous tetramethylammonium hydroxide (TMAOH)...
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5678167 |
Method for dissolving nuclear fuels
The powdered form of nuclear fuels such as uranium dioxide and plutonium dioxide are dispersed in an about 3N aqueous nitric acid solution, and irradiated by UV rays at a wavelength of...
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5640703 |
Treatment of solid wastes
A process for the treatment of solid waste material which is or is suspected to be contaminated with plutonium or compounds thereof with or without other hazardous contaminants, which process...
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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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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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5573738 |
Method for removing depleted uranium from contaminated soils
Soil, contaminated with radioactive material such as uranium, is treated to remove the radioactive contaminant. The soil is first pre-processed to remove and clean oversized particles for release...
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5523514 |
Process for dissolving plutonium and/or other radioactive elements present in solid or liquid products
The invention relates to the dissolving of plutonium and/or other radioactive elements in an aqueous solution by microwave heating. According to the invention, solid or liquid products containing...
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5516496 |
Metal and fluorine values recovery from fluoride salt matrices
The process for converting feed materials of high mineral content and substantial radioactivity levels to concentrated radionuclide products of high radioactivity levels and to other products of...
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5494648 |
Process for removing thorium and recovering vanadium from titanium chlorinator waste
A process for removal of thorium from titanium chlorinator waste comprising: (a) leaching an anhydrous titanium chlorinator waste in water or dilute hydrochloric acid solution and filtering to...
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5489736 |
Treatment of solid organic wastes
A process for the treatment of material which is or is suspected to be contaminated with one or more actinides or compounds thereof, which process includes contacting the said material with a...
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5482688 |
Plutonium dissolution process
A two-step process for dissolving plutonium metal, which two steps can be carried out sequentially or simultaneously. Plutonium metal is exposed to a first mixture containing approximately...
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5478538 |
Removal of radioactivity from zircon
The specification discloses a process for removing radionuclides from zircon. The process involves thermally decomposing the zircon in the presence of suitable additives, extracting the...
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5434331 |
Removal of radioactive or heavy metal contaminants by means of non-persistent complexing agents
A process for the decontamination of solid surfaces contaminated with radioactive or heavy metal species using a solution based on one or more non-persistent complexing agents, or for the chemical...
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5425927 |
Hafnium dioxide purification
Hafnium dioxide contaminated with 0.1 to 1 weight percent uranium dioxide is contacted with an aqueous acid such as nitric acid, hydrochloric acid, sulfuric acid and mixtures thereof to leach the...
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5422084 |
Process for dissolving plutonium dioxide by means of OH.sub.- radicals produced by the radiolysis of water usable for the treatment of dissolving fines and plutoniferous waste
The invention relates to a process for dissolving plutonium dioxide by means of OH - radicals produced by radiolysis of water and usable for the treatment of dissolving fines and plutoniferous...
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5419881 |
Process for treating dissolution residues
In a process for treating dissolution residues which are generated in the recovery of fission products, particularly fission molybdenum, wherein nuclear fuel comprising the elements uranium,...
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5419880 |
Controlled acid-strong acid strip process
A controlled multi-stage process for the stripping of uranium includes the introduction at one end of a solvent extraction device a uranium loaded organic solution. A concentrated stripping acidic...
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5368829 |
Continuous ash extraction process
Radioactive metal is recovered from solid oxides of the metal by exposing the oxide to a cocurrent flow of a first acid solution in a first contactor to form partially reacted oxides and a solution...
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5340505 |
Method for dissolving radioactively contaminated surfaces from metal articles
A method for dissolving radioactively contaminated surfaces of metal articles using a reagent of HBF 4 acid with the addition of at least one oxidation agent, preferably hydrogen peroxide H 2 O 2...
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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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5250273 |
Hydrometallurgical leaching process and apparatus
A process and apparatus for leaching metal values from a particulate mineral ore containing metal values employs a fluidized bed of the particles; a leaching agent solution containing dissolved...
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5205999 |
Actinide dissolution
A process for the treatment of a material which is or is suspected to contain or carry one or more actinides or compounds thereof to dissolve such actinides or compounds comprises contacting the...
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5181956 |
Method for purifying TiO.sub.2 ore
Process for beneficiating titanium bearing ore selected from the group consisting essentially of titaniferous ores, leucoxene, rutile, perovskite, and sphene comprising: (a) contacting said ore...
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5154899 |
Metal recovery from porous materials
A method for recovering plutonium and other metals from materials by leaching comprising the steps of incinerating the materials to form a porous matrix as the residue of incineration, immersing...
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5135728 |
Method for dissolving delta-phase plutonium
A process for dissolving plutonium, and in particular, delta-phase plutonium. The process includes heating a mixture of nitric acid, hydroxylammonium nitrate (HAN) and potassium fluoride to a...
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5085834 |
Method for separating by using crown compounds plutonium from uranium and from fission products in the initial stages for the reprocessing of irradiated nuclear fuels
A method for separating plutonium from uranium and from fission products with the aid of crown ether compounds comprising contacting an aqueous solution A0 containing Pu, U and fission products...
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