Process for washing secondary separator froth to recover bitumen
Abstract
Abstract Disclosed herein is a process for the separation of bitumen from Athabasca tar sands in which a secondary-separator froth stream is produced consisting primarily of bitumen entrained in tailings waters. The process comprises mixing the secondary-separator froth with fresh hot water and feeding the mixture downwardly through the inner zone formed by the draft tube, while preventing the mixture from rotating and forming a vortex, engaging the mixture in the tube by a down-throw impeller and then engaging the mixture in the tube by an up-throw impeller, to aid in the separation of the bitumen from the solids in the froth, passing the mixture into a lower quiescent settling zone, floating the bitumen to the surface of the liquid in the annulus formed by the draft tube, removing the floating bitumen from above the liquid level, removing the solids and water from the settling zone.
Inventors
- 👤 V Kaminsky
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |