US4316331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for mechanically dewatering peat
Assignee: Individual
•
Filing: 1978-11-21
•
Granted: 1982-02-23
•
Expires: 1998-11-21
Abstract
Abstract Wet peat is dewatered mechanically by conditioning a peat slurry in a decanter centrifuge producing an effluent containing peat particles, and a peat sludge. The sludge thereafter is subjected to a mechanical pressing operation.
Inventors
- 👤 Olle B. Lindstrom
- 👤 Rikard O. Lindstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:45
CPC Classifications
C; C10; C10F; C10F5/00; C10F5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A process for dewatering peat, said process utilizing a decanter centrifuge and a mechanical press, said process comprising the steps of: subjecting a slurry of water and fibrous peat to centrifugal forces in the decanter centrifuge to separate from said water/peat slurry an effluent of water and fine peat particles, recovering said water/peat slurry absent said separated effluent, and thereafter mechanically pressing the recovered water/peat slurry in the press to express water from the recovered water/peat slurry, at least a substantial portion of which water being expressed in liquid form.
Claim 2
Dependent Claim
90 words
A process for dewatering peat, said process utilizing a decanter centrifuge and a mechanical press, said process comprising the steps of: subjecting a slurry of water and fibrous peat to centrifugal forces in the decanter centrifuge to separate from said water/peat slurry an effluent of water and fine peat particles, recovering said water/peat slurry absent said separated effluent, and thereafter mechanically pressing the recovered water/peat slurry in the press to express water from the recovered water/peat slurry, at least a substantial portion of which water being expressed in liquid form.
Claim 3
Dependent Claim
24 words
A process according to claim 1, wherein said recovered water/peat slurry is mechanically pressed until the slurry contains from 40-65% dry substance by weight.
Claim 4
Dependent Claim
30 words
A process according to claim 1, wherein said fine peat particles contained in said effluent constitute at least 10% by weight of the dry substance originally present in the slurry.
Claim 5
Dependent Claim
20 words
A process according to claim 1, wherein said recovered water/peat slurry contains from 10% to 35% dry substance by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |