US4383888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for concentrating radioactive combustible waste
Assignee: Hitachi Ltd
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Filing: 1980-04-21
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Granted: 1983-05-17
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Expires: 2000-04-21
Abstract
Abstract In the concentration of radioactive combustible waste comprising evaporating and drying a radioactive combustible waste slurry by a thin film drier, the radioactive combustible wastes and an incombustible material, such as sodium sulfate, etc. obtained from a nuclear reactor effluent are mixed together in an amount of not more than 70% by weight, preferably 43 to 70% by weight, of radioactive combustible waste on the basis of a mixture on dry basis, and the mixture is fed to the thin film drier and evaporated and dried therein. A risk of powder explosion and fire is prevented in the drying step thereby.
Inventors
- 👤 Koichi Chino
- 👤 Hideo Yusa
- 👤 Kunio Kamiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:58
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; B01D1/222; B01D1/223; B01D1/225; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/08; Y; Y10; Y10S; Y10S159/00; Y10S159/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A process for concentrating radioactive combustible waste comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier; and evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to powder form.
Claim 2
Dependent Claim
107 words
A process for concentrating radioactive combustible waste comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier; and evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to powder form.
Claim 3
Dependent Claim
112 words
A process for concentrating radioactive combustible waste comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier with pivotally movable blades; and evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to dry powder form.
Claim 4
Dependent Claim
112 words
A process for concentrating radioactive combustible waste comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier with pivotally movable blades; and evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to dry powder form.
Claim 5
Dependent Claim
111 words
A process for concentrating radioactive combustible waste and preventing spontaneous combustion comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier; and evaporating the water and drying the mixture of radioadtive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to powder form.
Claim 6
Dependent Claim
111 words
A process for concentrating radioactive combustible waste and preventing spontaneous combustion comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier; and evaporating the water and drying the mixture of radioadtive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to powder form.
Claim 7
Dependent Claim
111 words
A process for concentrating radioactive combustible waste and preventing spontaneous combustion comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 30-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier; and evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to powder form.
Claim 8
Dependent Claim
111 words
A process for concentrating radioactive combustible waste and preventing spontaneous combustion comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 30-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier; and evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to powder form.
Claim 9
Dependent Claim
16 words
A process according to claim 1 or 2, wherein the resulting powders are pelletized into pellets.
Claim 10
Dependent Claim
121 words
A process for concentrating radioactive combustible waste comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier with pivotally movable blades; evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to dry powder form; and pelletizing the dry powder into pellets by a pelletizer.
Claim 11
Dependent Claim
121 words
A process for concentrating radioactive combustible waste comprising: providing a slurry of radioactive combustible waste comprising water and radioactive combustible waste; mixing the slurry of radioactive combustible waste with a slurry of radioactive incombustible waste comprising water and radioactive incombustible waste to form a mixture of radioactive wastes containing 43-70% by weight of radioactive combustible waste as based on a dry mixture of radioactive combustible waste and radioactive incombustible waste; feeding the mixture of radioactive wastes to a thin-film drier with pivotally movable blades; evaporating the water and drying the mixture of radioactive wastes in the mixture of radioactive wastes therein, thereby concentrating the radioactive combustible waste to dry powder form; and pelletizing the dry powder into pellets by a pelletizer.
Claim 12
Dependent Claim
33 words
A process according to claim 1, 2, 6, 3 or 4 wherein the radioactive combustible wastes are organic materials discharged from a nuclear reactor and the incombustible waste is a radioactive incombustible waste.
Claim 13
Dependent Claim
17 words
A process according to claim 7, wherein the organic materials are ion exchange resins, and filter aid.
Claim 14
Dependent Claim
33 words
A process according to claim 7, wherein the radioactive incombustible waste is at least one of sodium sulfate, sodium nitrate, sodium borate and ignition ash, obtained from radioactive wastes from a nuclear reactor.
References Cited (Backward Citations)
JPS5064699A
Cited
JPS5294866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |