Microbubble flotation process for the separation of bitumen from an oil sands slurry
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United States of America Patent
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Nov 8, 1988
Grant Date -
N/A
app pub date -
Dec 28, 1987
filing date -
Dec 28, 1987
priority date (Note) -
Expired
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Abstract
An improvement is provided to the known hot water process for extracting bitumen from mined oil sand. More particularly, a methodology is provided for the production of microbubbles of air, and it has been found that the so-produced microbubbles can be used in the primary flotation/settling step of the hot water process to yield increased bitumen recovery. More particularly, a steam stream and an air stream in admixture are injected via a submerged nozzle into a flowing aqueous stream. A plurality of finely dispersed microbubbles are formed. These microbubbles have a diameter less than about 100 microns. The stream of microbubbles is injected into the diluted aqueous tar sand slurry formed in the hot water process. The injection is practiced following the conditioning step and prior to the introduction of the slurry into the flotation/settling step.
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