Patent US5844935A successfully refreshed from Google Patents.
Patent US4303532A successfully refreshed from Google Patents.
US4303532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewatering of slimes
Assignee: United States Department of the Interior
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Filing: 1978-07-12
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Granted: 1981-12-01
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Expires: 1998-07-12
Abstract
Abstract Efficient dewatering of slimes is achieved by admixing the slimes with a flocculating agent, followed by mechanical manipulation to effect rapid removal of water and consolidation of solids. The required mechanical manipulation may be accomplished, e.g., by tumbling the mixture through a rotating cylindrical screen or by passing it across a vibrating screen.
Inventors
- 👤 Annie G. Smelley
- 👤 Robert W. Montgomery
- 👤 Bobby J. Hamner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:25
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; C02F11/121; C02F11/126; C02F1/00; C02F1/52; C02F1/54; C02F11/14; C02F11/147; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906; Y10S210/907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A process for dewatering of slimes consisting essentially of: admixing the slimes with an amount of flocculating agent sufficient to effect coagulation of the solids in the slimes, retaining the slimes-flocculating agent mixture for a time sufficient to form flocs of a size sufficient for moderately rapid settling, thereafter promptly introducing the resulting mixture of water and flocs into an inclined rotating cylindrical screen, thereby causing dynamic movement of solids, with resulting consolidation of solids, and rapid and simultaneous removal and separation of water, and separately collecting the resulting water and the dewatered and consolidated solids.
Claim 2
Dependent Claim
96 words
A process for dewatering of slimes consisting essentially of: admixing the slimes with an amount of flocculating agent sufficient to effect coagulation of the solids in the slimes, retaining the slimes-flocculating agent mixture for a time sufficient to form flocs of a size sufficient for moderately rapid settling, thereafter promptly introducing the resulting mixture of water and flocs into an inclined rotating cylindrical screen, thereby causing dynamic movement of solids, with resulting consolidation of solids, and rapid and simultaneous removal and separation of water, and separately collecting the resulting water and the dewatered and consolidated solids.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the slimes consist essentially of phosphate slimes.
Claim 4
Dependent Claim
17 words
The process of claim 1 in which the slimes consist essentially of a brine containing ganque clay.
Claim 5
Dependent Claim
22 words
The process of claim 1 in which the slimes consist essentially of leach liquor and residue from hydrochloric acid leaching of kaolin.
Claim 6
Dependent Claim
13 words
The process of claim 1 in which the flocculating agent is polyethylene oxide.
Claim 7
Dependent Claim
20 words
The process of claim 1 in which the retention time of the slimes-flocculating agent is about 2 to 30 seconds.
References Cited (Backward Citations)
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Cited
US3423313A
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US3630893A
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US3956116A
Cited
US3904520A
Cited
US4051027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |