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Improved efficiency in bitumen recovery was observed in laboratory experiments when oil sand pulp was intentionally aerated by air sparging during digestion. The mechanism of gas bubble attachment to bitumen lenses (at the surface of sand grains), the spreading of bitumen on a gas bubble and the release of bitumen-enveloped bubbles from the sand particles, all of which are of practical significance...
Laboratory agglomeration-flotation tests were used to evaluate the recovery of residual bitumen from a sample of Suncor oil sands fine tailings, using ground coal as a bitumen absorbent. To improve its effectiveness, the coal was preconditioned with no. 2 fuel oil, subjected to 30 s high-shear mixing and collected by flotation over 3 min. This oil-conditioned coal was then contacted with mature...
Bitumen-sand interaction was studied as a function of pH, particle size, temperature and solvent addition to bitumen. Sand particles can be easily detached from the bitumen surface at pH > 6. At pH < 6, strong attachment between bitumen and sand is observed. The bitumen-sand interaction is also particle-size dependent: the finer the particles, the stronger the attachment. The detachment...
Bitumen-sand interaction was studied as a function of pH, particle size, temperature and solvent addition to bitumen. Sand particles can be easily detached from the bitumen surface at pH > 6. At pH < 6, strong attachment between bitumen and sand is observed. The bitumen-sand interaction is also particle-size dependent: the finer the particles, the stronger the attachment. The detachment of coarse...
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