US4225433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration of hot water extraction process whole tailings
Assignee: Ontario Energy Corp
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Filing: 1978-10-02
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Granted: 1980-09-30
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Expires: 1998-10-02
Abstract
Abstract Whole tailings are treated with a flocculant to cause fines to agglomerate with the coarse particles. The product is then vacuum filtered to separate the fines from the water.
Inventors
- 👤 Joseph K. Liu
- 👤 Stephen J. Lane
- 👤 Lubomyr M. Cymbalisty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:59
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/045; B; B01; B01D; B01D37/00; B01D37/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A method for treating combined whole tailings from a hot water extraction process plant, said tailings including water, and coarse and fine solids, which comprises: mixing the whole tailings, without prior settling, with a flocculating agent to aggolmerate fine solids with coarse solids and co-settling the fine solids with the coarse solids; and immediately thereafter vacuum filtering the entire product without a filter aid to separate the water and solids.
Claim 2
Independent Claim
70 words
A method for treating combined whole tailings from a hot water extraction process plant, said tailings including water, and coarse and fine solids, which comprises: mixing the whole tailings, without prior settling, with a flocculating agent to aggolmerate fine solids with coarse solids and co-settling the fine solids with the coarse solids; and immediately thereafter vacuum filtering the entire product without a filter aid to separate the water and solids.
Claim 3
Dependent Claim
14 words
The method as set forth in claim 1 wherein: the flocculating agent is lime.
Claim 4
Dependent Claim
31 words
The method as set forth in claim 2 wherein: the amount of lime added is sufficient to provide a concentration of 300 ppm to 700 ppm lime in the tailings-flocculant mixture.
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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |