Role of Dissolving Carbon Dioxide in Densification of Oil Sands Tailings
Bibliographic record
Abstract
Carbon dioxide (CO 2 ) was shown as a promising alternative for oil sands tailings treatment with economical and environmental benefits. This study aims to understand the role of CO 2 addition in densification of oil sands tailings. In this study, CO 2 was pressurized into two industrial whole tailings provided by Syncrude Canada Ltd. and Canadian Natural Resource Ltd. The optimal initial settling rate, supernatant clarity and solids content of sediment were achieved at a CO 2 partial pressure of about 100 kPa. The improvement on densification of oil sands tailings by CO 2 was mainly attributed to pH reduction under various CO 2 partial pressures. The zeta potential of fines became less negative with decreasing pH, enhancing coagulation of fine solids. On the other hand, CO 2 bubbles formed by dissolved gas under supersaturation pressure led to a less clear supernatant by disturbing the formed sediments. Supersaturation with nitrogen was applied to the oil sands tailings to verify the influence of dissolved gas on solids sedimentation. The limit to CO 2 sequestration by oil sands tailings was experimentally evaluated.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".