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| Number | Title | Issue Date |
| 7998439 | Method for separating and recycling uranium and fluorine form solution A separation and recycling method for recycling uranium and fluoride from a waste liquid sequentially and separately is disclosed. The method comprises a uranium-recycling process and a fluoride-recycling process. In the uranium-recycling process, an alkali metal co... | 08/16/2011 |
| 7419604 | Use of boron compounds to precipitate uranium from water A method is provided for removing uranium from water. The method includes the mixing of a boron reagent with water contaminated with uranyl dication ions, leading to removal of the uranium from that water. ... | 09/02/2008 |
| 7323190 | Cell delivery system comprising a fibrous matrix and cells Cell storage and delivery systems and methods for storing and delivering viable cells to a mammal are disclosed. The cell storage and delivery systems include a biodegradable and/or bioabsorbable fibrous matrix physically associated with viable cells to contain and ... | 01/29/2008 |
| 7316644 | Method for preparing particles of radioactive powder containing Cesium-131 for use in brachytherapy sources The present invention provides a method of preparing Cesium-131 (Cs-131) as a dispersed radioisotope. Uses of the dispersed Cs-131 prepared by the method include cancer research and treatment, such as for the use in brachytherapy. Cs-131 is particularly useful in th... | 01/08/2008 |
| 7288234 | Glycols as an adjuvant in treating wastes using the Molten Salt Oxidation process An improved system and method for using polyethylene glycol (PEG) as a processing fluid additive for safely and effectively treating water-wet hogout propellant as well as any other water-wet propellants, explosives and hazardous wastes (solids and liquids) to make ... | 10/30/2007 |
| 7214362 | Purification method for producing high purity niobium compound and/or tantalum compound An object of the present invention is to provide a method for purifying a highly pure niobium compound and/or tantalum compound, the method enabling the purification of a highly pure niobium compound and tantalum compound in a simplified manner at a low cost. The ob... | 05/08/2007 |
| 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 following stages: a) mixing... | 03/27/2007 |
| 7192563 | Process for recovery of high purity uranium from fertilizer grade weak phosphoric acid A two-cycle countercurrent extraction process for recovery of highly pure uranium from fertilizer grade weak phosphoric acid. The proposed process uses selective extraction using di-(2-ethyl hexyl) phosphoric acid (D2EHPA) and tri-n-butyl phosphate (TBP) with refine... | 03/20/2007 |
| 7175823 | Purification method for producing high purity niobium compound and/or tantalum compound The present invention provides a method enabling the high purification of a niobium compound and/or tantalum compound in a simplified manner at a low cost. This is accomplished by providing a method enabling the high purification of a niobium compound and/or tantalu... | 02/13/2007 |
| 7169370 | Method for co-precipitating actinides and method for preparing mixed actinide oxides The present invention generally relates to the preparation of mixed actinide oxides, such as mixed oxides of uranium and plutonium (U, Pu) O2, by simultaneously coprecipitation and then calcinations. ... | 01/30/2007 |
| 7087206 | Multicolumn selectivity inversion generator for production of high purity actinium for use in therapeutic nuclear medicine A multicolumn selectivity inversion generator separation method has been developed in which actinium ions, a desired daughter radionuclide, are selectively extracted from a solution of the thorium parent and daughter radionuclides by a primary separation column, str... | 08/08/2006 |
| 6960311 | Radiation shielding materials and containers incorporating same An improved radiation shielding material and storage systems for radioactive materials incorporating the same. The PYRolytic Uranium Compound (“PYRUC”) shielding material is preferably formed by heat and/or pressure treatment of a precursor material comprising m... | 11/01/2005 |
| 6610152 | Method for removing inorganic matter from solid surfaces Metal ions are removed from solid surfaces which may be contaminated with one or more radionuclides by contacting the solid surfaces with the supercritical fluid, as, for instance, carbon dioxide containing both an acidic ligand and organic amine. The met... | 08/26/2003 |
| 6599490 | Process for making uranium carbide An improved radiation shielding material and storage systems for radioactive materials incorporating the same. The PYRolytic Uranium Compound ("PYRUC") shielding material is preferably formed by heat and/or pressure treatment of a precursor material compr... | 07/29/2003 |
| 6517788 | Method and device for separating caesium, strontium and transuranium elements contained in sodium waste The present invention relates to a method for the continuous separation of caesium, strontium and transuranium elements contained in sodium waste which comprises the use of NaTPB, and to a device for the implementation of this method. The method of the in... | 02/11/2003 |
| 6471922 | Actinide removal from spent salts A method for removing actinide contaminants (uranium and thorium) from the spent salt of a molten salt oxidation (MSO) reactor is described. Spent salt is removed from the reactor and analyzed to determine the contaminants present and the carbonate concen... | 10/29/2002 |
| 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 the contaminants present and the carbonate concentration. Th... | 08/20/2002 |
| 6419832 | Process for removing dissolved uranium from water A process for removing dissolved uranium from water is provided. The process basically comprises (a) mixing phosphoric acid or particulate bone ash with the water, (b) mixing calcium hydroxide with the mixture produced in step (a) to thereby form calcium ... | 07/16/2002 |
| 6303090 | Conversion of depleted uranium hexafluoride to a solid uranium compound A process for converting UF6 to a solid uranium compound such as UO2 and CaF. The UF6 vapor form is contacted with an aqueous solution of NH4 OH at a pH greater than 7 to precipitate at least some solid uranium ... | 10/16/2001 |
| 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 (S100) and the resulting solution is subjected to electrolytic ... | 03/07/2000 |
| 5678242 | Membrane extraction with thermodynamically unstable diphosphonic acid derivatives Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and vinylidene-1,1-diphosphonic acid, are capable of complexing with m... | 10/14/1997 |
| 5678241 | Process for concentrating thorium containing magnesium slag The present invention describes a process to reduce the volume and/or weight of magnesium slag when the magnesium slag contains radioactive thorium. The process contacts the magnesium slag as an aqueous slurry with an acid in a pH range from about 4.0 to ... | 10/14/1997 |
| 5574960 | Method of separating exothermic elements from high-level radioactive liquid waste A method of separating exothermic elements of Cs and Sr from a high-level radioactive liquid waste. The method comprises a denitration step wherein formic acid is added to the high-level liquid waste so as to adjust its pH to about 5, thereby causing most... | 11/12/1996 |
| 5531970 | Metal and fluorine values recovery from mineral ore treatment The process for separating U or Th values from values of at least one other metal such as Ta, Nb, Sc, Zr, Ti or Mg, wherein all of the values are contained in a difficult soluble matrix of highly fluorinated feed materials such as U or Th bearing ores or ... | 07/02/1996 |
| 5468394 | Precipitation and separation of salts, scale salts, and norm contaminant salts from saline waters and saline solutions In this invention, a novel process for saline waters and saline solutions conversion has been provided that requires only a fair amount of a miscible organic solvent and heat transfer. Such requirements are ordinary in the nature of precipitation and vapo... | 11/21/1995 |
| 5460791 | Method for adsorbing and separating heavy metal elements by using a tannin adsorbent and method of regenerating the adsorbent A method of adsorbing and separating a heavy metal element by using a tannin adsorbent comprising: (a) adjusting the pH of a solution containing a plurality of heavy metal elements to a predetermined pH; (b) contacting the adsorbent with the solution in which ... | 10/24/1995 |
| 5458745 | Method for removal of technetium from radio-contaminated metal Technetium is separated from radio-contaminated metal in a three-step process. The contaminated metal is dissolved in an acid solution; the technetium, present in the resultant solution as pertechnetate ions, is quantitatively reduced to its metallic stat... | 10/17/1995 |
| 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 containing solid phase and a metal containing first liquid... | 08/01/1995 |
| 5403565 | Thorium phosphates prepared by insolubilization of soluble thorium compounds Environmental pollution stemming from the industrial discharge and/or storage of water-soluble thorium compounds is avoided by converting same into essentially innocuous water-insoluble thorium phosphates, notably orthorhombic thorium phosphates, by (i) r... | 04/04/1995 |
| 5391347 | Process for the production of sintered nuclear fuel pellets from precipitated solutions with the aid of hydrogen peroxide in an acid medium Process for obtaining fritted oxide pellets of the MxOy type for nuclear fuels from solutions of soluble salts of the element or elements M, involving stage of precipitating the elements M by hydrogen peroxide in an acid medium. During this precipitation,... | 02/21/1995 |
| 5385713 | Metal and fluorine values recovery from mineral ore treatment The process for recovering boron values and fluorine values from an acidic aqueous feed liquor containing substantial fluoroborate moieties, including contacting the feed liquor with basic material to adjust the pH thereof to above about 7.0 and provide a... | 01/31/1995 |
| 5370827 | Solution decontamination method using precipitation techniques Solutions such as for example drinking water, ground water and extracting solutions contaminated with heavy metals and radioactive species, singly or in combination, are treated by first treating the contaminated solution with silicate and ammonium hydrox... | 12/06/1994 |
| 5332531 | Extracting metal ions with diphosphonic acid, or derivative thereof Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and vinylidene-1,1-diphosphonic acid, are capable of complexing with m... | 07/26/1994 |
| 5324491 | Enzymatic reduction and precipitation of uranium A method for removing uranium from uranium contaminated water involves adding uranium reducing microorganisms and an electron donor to uranium contaminated water to reduce U(VI) in the uranium contaminated water to U(IV) which in turn forms a UO2 | 06/28/1994 |
| 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 comprising a dilute solution of about 0.05 molar ethylene diamine... | 06/21/1994 |
| 5273725 | Metal and fluorine values recovery from mineral ore treatment The process for converting water insoluble, hazardous materials of high mineral content containing, e.g., substantial metal values of one or more of Ca, Ta, Nb, Mn, Mg, Al or the like to valuable nonhazardous products or discard, wherein the material also... | 12/28/1993 |
| 5225087 | Recovery of EDTA from steam generator cleaning solutions A process for recovering the chelating or complexing agents, particularly ethylenediaminetetraacetic (EDTA), used in chemical cleaning and decontamination operations performed to clean steam generators, especially nuclear powered steam generators, is prov... | 07/06/1993 |
| 5223181 | Process for selectively concentrating the radioactivity of thorium containing magnesium slag Magnesium is separated from magnesium slag containing radioactive thorium and its daughters by solubilizing magnesium from magnesium slurry using carbon dioxide and separating magnesium from magnesium slurry containing thorium and its daughters by filteri... | 06/29/1993 |
| 5223233 | Method of concentrating plutonium nitrate solution at low temperature A method of concentrating a plutonium nitrate solution comprising the steps of cooling the plutonium nitrate solution to a temperature of -60° to -40° C. to produce a frozen matter comprising water and nitric acid, and filtering the thus produced frozen... | 06/29/1993 |
| 5183541 | Decontamination of radioactive metals Technetium is separated from nickel by electro-refining contaminated nickel. Electrorefining controls the electrolyte solution oxidation potential to selectively reduce the technetium from the metallic feedstock solution from Tc(VII) to Tc(IV) forcing it ... | 02/02/1993 |
