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| Number | Title | Issue Date |
| 7338429 | Method for direct solidification and stabilization of liquid hazardous wastes containing up to 100,000 mg/L of arsenic The present invention relates to a method for direct treatment of liquid wastes containing up to 10% or 100,000 mg/L of arsenic by solidification/stabilization in a relatively cost effective and environmentally safe. The method also permits the simultaneous utilizat... | 03/04/2008 |
| 7309807 | Method of containing radioactive contamination A method of controlling or containing radioactive contamination by providing a neutron absorbing material to a radioactive contamination site. Preferably the neutron absorbing material is present as a powder, granule, slurry or suspension, allowing the neutron absor... | 12/18/2007 |
| 7294375 | Cement composite, concrete, concrete cask and method of manufacturing concrete The invention provides a composite from which concrete featuring a sufficiently high heat resistance can be produced, as well as a high-safety sealed concrete cask having no opening (shielding defect) to offer high shielding performance that can prevent corrosion of... | 11/13/2007 |
| 7250119 | Composite materials and techniques for neutron and gamma radiation shielding This invention deals with multi-component composite materials and techniques for improved shielding of neutron and gamma radiation emitting from transuranic, high-level and low-level radioactive wastes. Selective naturally occurring mineral materials are utilized to... | 07/31/2007 |
| 7091393 | Processes for immobilizing radioactive and hazardous wastes The present invention utilizes one or more processes to immobilize a waste that contains one or more of radionuclides, hazardous elements, hazardous compounds, and/or other compounds present in the waste. Each of the processes create a barrier against leaching and d... | 08/15/2006 |
| 7022292 | Radioactive waste treatment facility An injection and solidification operation as well as a kneading and solidification operation can be performed by a single facility. A decreased amount of radioactive secondary waste is generated. A solidifying agent paste is prepared by kneading a solidifying agent ... | 04/04/2006 |
| 6818188 | Radioactive waste treatment facility An injection and solidification operation as well as a kneading and solidification operation can be performed by a single facility. A decreased amount of radioactive secondary waste is generated. A solidifying agent paste is prepared by kneading a solidifying agent ... | 11/16/2004 |
| 6784444 | Containment and transportation of decommissioned nuclear reactor pressure vessels Apparatus for containing, transporting, and storing or disposing of radioactive machinery, including decommissioned nuclear reactor pressure vessels. An improved, economically-produced container allows easier handling and packaging of machinery within plants where t... | 08/31/2004 |
| 6776837 | Formation of chemically bonded ceramics with magnesium dihydrogen phosphate binder A new method for combining magnesium oxide, MgO, and magnesium dihydrogen phosphate to form an inexpensive compactible ceramic to stabilize very low solubility metal oxides, ashes, swarfs, and other iron or metal-based additives, to create products and waste forms w... | 08/17/2004 |
| 6734334 | Processes for immobilizing radioactive and hazardous wastes The present invention utilizes one or more processes to immobilize a waste that contains one or more of radionuclides, hazardous elements, hazardous compounds, and/or other compounds present in the waste. Each of the processes create a barrier against leaching and d... | 05/11/2004 |
| 6617484 | Containment and transportation of decommissioned nuclear reactor pressure vessels and the like Method and apparatus for containing, transporting, and storing or disposing of radioactive machinery, including decommissioned nuclear reactor pressure vessels. An improved, economically-produced container is provided which allows easier handling and pack... | 09/09/2003 |
| 6436025 | Co-solidification of low-level radioactive wet wastes produced from BWR nuclear power plants This invention discloses a method for the co-solidification of low-level radioactive wet wastes of BWR nuclear power plants, including concentrate waste, spent ion exchange resins and sludge wastes etc., with very high volume efficiency. In this invention... | 08/20/2002 |
| 6399848 | Encapsulation of hazardous waste materials A method of encapsulating hazardous waste materials including heavy metals such as arsenic, mercury, nickel and chromium residues, as well as radioactive materials. The method involves adding the hazardous waste material to a settable composition, forming... | 06/04/2002 |
| 6153809 | Polymer coating for immobilizing soluble ions in a phosphate ceramic product A polymer coating is applied to the surface of a phosphate ceramic composite to effectively immobilize soluble salt anions encapsulated within the phosphate ceramic composite. The polymer coating is made from ceramic materials, including at least one inor... | 11/28/2000 |
| 6133498 | Method for producing chemically bonded phosphate ceramics and for stabilizing contaminants encapsulated therein utilizing reducing agents Known phosphate ceramic formulations are improved and the ability to produce iron-based phosphate ceramic systems is enabled by the addition of an oxidizing or reducing step during the acid-base reactions that form the phosphate ceramic products. The addi... | 10/17/2000 |
| 5998690 | Method and agents for solidification of boric acid and/or borates solutions A unique method for solidification of solutions containing boric acid and/or borates is disclosed in this invention. The boron species in the solutions are polymerized to form polyborates, and the solutions are then solidified by mixing with solidificatio... | 12/07/1999 |
| 5973220 | Method of disposal of metallic aluminum-containing radioactive solid waste Disclosed is a method of disposal of metallic aluminum-containing solid waste comprising the steps of reacting radioactive solid waste containing metallic aluminum with an alkali solution to generate a hydrogen gas and then mixing the resulting reaction l... | 10/26/1999 |
| 5732363 | Solidifying material for radioactive wastes, process for solidifying radioactive wastes and solidified product There are provided a solidifying material used for radioactive waste which comprises a latent hydraulic material, an ultra-fine powder substance and a dispersing agent, and a process for the solidification of radioactive wastes which comprises kneading th... | 03/24/1998 |
| 5678234 | Process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes The present invention provides a method for encapsulating and stabilizing radioactive, hazardous and mixed wastes in a modified sulfur cement composition. The waste may be incinerator fly ash or bottom ash including radioactive contaminants, toxic metal s... | 10/14/1997 |
| 5640704 | Process for solidification and immobilization of harmful waste species The present invention provides methods and processes for immobilizing and solidifying harmful heavy metal and radioactive species within a waste material. The processes of the present invention are also particularly advantageous for immobilizing and solid... | 06/17/1997 |
| 5569153 | Method of immobilizing toxic waste materials and resultant products A method of immobilizing toxic waste material slurries is disclosed wherein aggregates are formed containing the toxic waste and the aggregates admixed with and embedded in a sulfur cement to form a concrete shape. Novel aggregates and mortar, and concret... | 10/29/1996 |
| 5545796 | Article made out of radioactive or hazardous waste and a method of making the same An article, such as a containment system (10), having sides (12) with walls (2) or (24) is made; in one method by using cast, cooled, melted, radioactive metal components where the melted metal has a specific activity over 130 Bq/g; or by providing a cont... | 08/13/1996 |
| 5481061 | Method for solidifying radioactive waste The present invention relates to a method of solidifying radioactive waste with cement, comprising forming a mixture comprising water, a hydrophilic material and cement substantially non-shrinkable or expansible with respect to volume change upon hardenin... | 01/02/1996 |
| 5463171 | Method for solidification of waste, and apparatus, waste form, and solidifying material therefor Objective of the present invention is to provide a preferable solidified body ensuring performance of artificial barrier in a solidifying process for incombustible miscellaneous solid waste and other wastes such as calcined ashes by preventing generation ... | 10/31/1995 |
| 5457262 | Preparation of inorganic hardenable slurry and method for solidifying wastes with the same The present invention discloses a method for preparing the inorganic hardenable slurry and the use of same in the solidification of wastes. In addition to water, the essential parts of the slurry are inorganic components including borates, cement-base pow... | 10/10/1995 |
| 5457266 | Process for treating radioactive waste A process for treating radioactive waste in the form of contaminated powdery ionic exchange resin to make it suitable for final storage by reducing its volume as much as possible, includes mechanically dewatering the ion exchange resin. The dewatered ion ... | 10/10/1995 |
| 5386078 | Process for decontaminating radioactive metal surfaces A method for decontaminating a radioactively contaminated metallic object. A radioactively contaminated metallic object is placed into a first bath and thus contacted with a non-radioactive, aqueous solution containing formic acid until the formic acid is... | 01/31/1995 |
| 5242603 | Process for the disposal of waste A process for treating waste by mixing the waste with a chemical reagent and a pozzolanic material. The chemical reagent includes a retarder that is a viscosity-altering reagent, and an accelerator.... | 09/07/1993 |
| 5143654 | Method and apparatus for solidifying radioactive waste A method of solidifying a radioactive waste of an atomic power plant, for example, begins with concentrating the liquid waste to powder or pellet form to reduce its volume. Prior to reducing its volume, an estimation is made of what the concentration will... | 09/01/1992 |
| 5114622 | Method of cementing radioactive waste and cemented body The present invention relates to a method of cementing a radioactive waste and a cemented body thereof which are less liable to bring about radioactivity leakage for a long period of time and suitable for disposal of cemented bodies of radioactive wastes ... | 05/19/1992 |
| 5098612 | Method of preparing solidified and stabilized hazardous or radioactive liquids An aqueous liquid or sludge waste is solidified by mixing it with a clay selected from the group consisting of sodium Montmorillonite, attapulgite, sepiolite, and mixtures thereof and a cementitious material coated with a fluid silicone polymer.... | 03/24/1992 |
| 5045241 | Method for solidifying radioactive wastes A method of solidifying radioactive wastes comprising the steps of substituting the atmosphere inside a container packed with radioactive waste with a condensable vapor, pouring a matrix material into said container and thereafter condensing said vapor. T... | 09/03/1991 |
| 5008045 | Method and apparatus for centrifugally casting hazardous waste A casting containing toxic waste is made by centrifugally casting toxic waste in a pre-formed cage having heat conducting means therein. The casting is formed with suitable shielding materials selected as a function of the waste being cast. The finished c... | 04/16/1991 |
| 4943394 | Method of storing radioactive waste without risk of hydrogen escape In order to prevent the formation of a hydrogen atmosphere in a free gas ce usually available in the storage containers of radioactive waste, potassium permanganate is dispersed in a suitable carrier within the storage barrel provided for the waste. When... | 07/24/1990 |
| 4906408 | Means for the conditioning of radioactive or toxic waste in cement and its production process A process for conditioning radioactive or toxic waste which can contain boron in a cement-based matrix comprises mixing the waste in a drum in the presence of water with non-aluminous cement, aluminous cement and optionally a siliceous compound and/or a b... | 03/06/1990 |
| 4842773 | Method of producing a solid product containing cement for storing tritium water in an accessible terminal storage facility The invention is directed to a method for producing a cement product for terminal storage of tritium water wherein activated bentonite capable of swelling is dispersingly mixed with the tritium water and the suspension obtained thereby is subjected to a... | 06/27/1989 |
| 4839102 | Block for containing and storing radioactive waste and process for producing such a block The present invention relates to a block for containing and storing radioactive waste, as well as to a process for producing such a block. In known manner, the waste is coated in a composite matrix constituted by hardened cement and epoxy resin. According... | 06/13/1989 |
| 4828761 | Process for impregnating a concrete or cement body with a polymeric material A process for impregnating cementitious solids with polymeric materials by blending polymeric materials in a grout, allowing the grout to cure, and contacting the resulting solidified grout containing the polymeric materials with an organic mixture contai... | 05/09/1989 |
| 4708822 | Method of solidifying radioactive solid waste A method of solidifying radioactive waste wherein radioactive solid waste of a predetermined shape are embedded in a solidifying material which has a modulus of elasticity that is equal to, or smaller than, the modulus of elasticity of said waste, to prov... | 11/24/1987 |
| 4659511 | Method for solidifying radioactive waste A process for solidifying radioactive wastes, which comprises adding, to pellet or dissolved radioactive wastes, an alkali metal silicate as a filler, silicic acid, carbonic acid or an alkaline earth metal or polyvalent metal salt thereof as a hardener, a... | 04/21/1987 |
