US4290907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating radioactive waste
Assignee: Hitachi Ltd
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Filing: 1978-11-22
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Granted: 1981-09-22
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Expires: 1998-11-22
Abstract
Abstract Granular ion exchange resins in a desalter provided in a nuclear power plant are taken out from the desalter as used ion exchange resins when their capacities are lowered. The used ion exchange resins in a slurry state are led to a thin film drier. A rotating shaft provided with rotating blades is inserted in the thin film drier. When the slurry of the used ion exchange resins is led thereto, the rotating shaft is driven to rotate, and the side wall of the thin film drier is heated. The used ion exchange resins led to the thin film drier are heated and pulverized to powder by the action of rotating blades. The powder is taken out of the thin film drier to the outside and shaped into pellets.
Inventors
- 👤 Susumu Horiuchi
- 👤 Mikio Hirano
- 👤 Hideo Yusa
- 👤 Koichi Chino
- 👤 Tatsuo Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:32
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
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A process for treating a granular radioactive waste, which comprises: supplying an aqueous slurry of a used radioactive granular, water-insoluble, ion exchange resin discharged from a radioactive material-handling facility into a thin film drier including a shell equipped with a heated wall surface and a rotating shaft having blades that pass closely adjacent to said heated wall surface, and pressing the radioactive granular, water-insoluble ion exchange resin onto the heated wall surface by moving said blades past said heated wall surface with rotation of said rotating shaft, thereby pulverizing the radioactive granular, water-insoluble, ion exchange resin into a powder.
Claim 2
Dependent Claim
99 words
A process for treating a granular radioactive waste, which comprises: supplying an aqueous slurry of a used radioactive granular, water-insoluble, ion exchange resin discharged from a radioactive material-handling facility into a thin film drier including a shell equipped with a heated wall surface and a rotating shaft having blades that pass closely adjacent to said heated wall surface, and pressing the radioactive granular, water-insoluble ion exchange resin onto the heated wall surface by moving said blades past said heated wall surface with rotation of said rotating shaft, thereby pulverizing the radioactive granular, water-insoluble, ion exchange resin into a powder.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the radioactive granular ion exchange resin is supplied into a centrifugal film drier and pulverized therein.
Claim 4
Dependent Claim
28 words
A process according to claim 1, wherein the resulting powder is filled into a vessel and then a solidifying agent is poured into the vessel and solidified therein.
Claim 5
Dependent Claim
21 words
A process according to claim 1, wherein the resulting powder is admixed with a binder and then shaped into said pellets.
Claim 6
Dependent Claim
27 words
A process according to claim 4, wherein the pellets are filled in a vessel, and then a solidifying agent is poured into the vessel and solidified therein.
References Cited (Backward Citations)
US4033868A
Cited
US3838061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |