Patent US4904416A successfully refreshed from Google Patents.
US4904416A
Expired / Lapsed
US
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Cement solidification treatment of spent ion exchange resins
Assignee: JGC Corp
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Filing: 1988-07-26
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Granted: 1990-02-27
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Expires: 2008-07-26
Abstract
Abstract Disclosed is an improved process for cement solidification treatment for disposition of spent ion exchange resins exhausted from nuclear power plants. The wet resin particles are centrifuged to remove free water therefrom and subjected to the pre-treatment of coating with a small amount of cement powder, and then, cement powder and water is added to the resin particles and the mixture is kneaded to form cement paste, which is cast in to a vessel for solidification. The cast product contains much more resin particles and has improved water-resistability.
Inventors
- 👤 Rey Sudo
- 👤 Norimitsu Kurumada
- 👤 Fukuzo Todo
- 👤 Masao Hara
- 👤 Kenzo Sauda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:04
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1055; C04B20/1077; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/28; G21F9/30; G21F9/301; G21F9/302; G21F9/304; C04B2111/00; C04B2111/00474; C04B2111/00767; C04B2111/00784; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A process for cement solidification treatment of spent ion exchange resins, which comprises dehydrating the wet resin particles to remove free water therefrom; applying a small amount of cement powder thereon under stirring as pre-treatment to coat the surface of the resin particles with the cement powder; then, adding cement powder and water to the pre-treated resin particles and kneading to form a uniform mixture of cement past; and finally casting the cement paste into a vessel to solidify it therein.
Claim 2
Dependent Claim
81 words
A process for cement solidification treatment of spent ion exchange resins, which comprises dehydrating the wet resin particles to remove free water therefrom; applying a small amount of cement powder thereon under stirring as pre-treatment to coat the surface of the resin particles with the cement powder; then, adding cement powder and water to the pre-treated resin particles and kneading to form a uniform mixture of cement past; and finally casting the cement paste into a vessel to solidify it therein.
Claim 3
Dependent Claim
35 words
A process for cement solidification treatment according to claim 1, wherein the cement is selected from the group consisting of portland cement and a mixture of portland cement with at least one other hydraulic material.
Claim 4
Dependent Claim
38 words
A process for cement solidification treatment according to claim 1, wherein the free water separated at the step of dehydrating the wet spent ion exchange resin is used as a portion of the water for kneading the mixture.
Claim 5
Dependent Claim
20 words
A process for cement solidification treatment according to claim 1, wherein the spent ion exchange resins include anion exchange resins.
Claim 6
Dependent Claim
78 words
A process for solidification treatment of spent ion exchange resins, which comprises: dehydrating wet spent ion exchange resin particles, coating the surface of the resulting dehydrated particles with a small amount of cement powder by adding a small amount of the cement powder to the dehydrated particles and stirring, adding cement and water to the resulting cement coated particles and kneading the resulting mixture into an uniform mixture, and solidifying the uniform mixture by casting in a vessel.
Claim 7
Dependent Claim
78 words
A process for solidification treatment of spent ion exchange resins, which comprises: dehydrating wet spent ion exchange resin particles, coating the surface of the resulting dehydrated particles with a small amount of cement powder by adding a small amount of the cement powder to the dehydrated particles and stirring, adding cement and water to the resulting cement coated particles and kneading the resulting mixture into an uniform mixture, and solidifying the uniform mixture by casting in a vessel.
Claim 8
Dependent Claim
23 words
A process for cement solidification treatment according to claim 5, wherein the wet spent ion exchange resin particles include anion exchange resin particles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |