The role of fine particles in the stability of emulsion in the naphthenic froth treatment (NFT) process
Bibliographic record
Abstract
This study investigates the role of fine particles in stabilizing emulsion in the naphthenic froth treatment (NFT) process. The characterization results of different types of solids collected from the diluted bitumen froth indicate that kaolinite is the dominant clay mineral in the composition of NFT solids. There were differences in the mineralogy of the fine samples depending on the phase (carrier fluid) from which the samples were collected. FTIR analysis shows that the fines that remain in the diluted bitumen even after several hours of sample retention time are mainly kaolinite, though the presence of other minerals such as siderite is very likely. Moreover, the presence of organic functional groups on the surface of the particles is confirmed for all types of solids in the FTIR analysis, regardless of the washing and drying procedures employed. Inspection of the different layers of the diluted bitumen via micrography and measurement of the solids concentration shows higher fine content and smaller particles in the top layer, a dire situation for destabilizing the emulsion in the top layer, supported by the observation that the water droplets in this layer are tiny. Solid partitioning tests revealed the solid particles migrate to the interfacial region and the aqueous phase. The concentration of particles increased in the interfacial region with the presence of asphaltene in the oil phase (dominant effect) and the increased polarity of the oil. The wettability measurements show that without the coverage of solid particles with organics (asphaltene-resin molecules), the fine particles are extremely hydrophilic. The adsorption of asphaltene-resin matter on the fine particles increased the hydrophobicity of the fines, a situation that promotes the partitioning of the fine particles at the interfacial region and the stability of the droplets. It was observed that the contact angle increased with the decreasing polarity of the oil phase. In the interfacial tension measurements, the fine solids with minimal asphaltic matter coverage did not remain suspended in the oil phase and either sedimented rapidly or migrated to the air-oil interface, unlike the organics-covered solids which remained immersed in oil. No decrease in the interfacial tension was recorded for the water-oil systems in the presence of fine solids. Interfacial rheology measurements illustrate the viscoelastic behavior of the interfacial film at lower frequencies and higher fine particle concentrations. We conclude that if not for the interaction between the asphaltic matter and the fine particles, the emulsion stability by fine particles would have been very unlikely.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".