Method for extraction of bitumen from oil sands using lime

Details Method for extraction of bitumen from oil sands using lime Method for extraction of bitumen from oil sands using lime

2011-04-26

2011-04-26

Caldarola, Glenn A (Department: 1771)

Mineral oils: processes and products

Tar sand treatment with liquid

C208S391000

Reexamination Certificate

active

07931800

ABSTRACT:
In a method for enhancing the efficiency of bitumen recovery from oil sands ore, CaO lime (or Ca(OH)2) is mixed into an oil sands ore-water slurry prior to or during the operation of slurry-based bitumen extraction processes. The lime is introduced at dosages effective to reduce the electro-chemical attraction between clay particles and bitumen in the slurry, thereby promoting detachment of clay particles from bitumen droplets in the ore-wafer slurry. This occurs because water-soluble asphaltic acids formed at the bitumen-water interface act as surfactants which reduce or eliminate the activity of Ca2+and Mg2+ions binding the clay particles and bitumen together. The detachment of clay particles promotes the attachment of air bubbles to the bitumen droplets, thereby forming a bitumen-rich froth which will float to the surface of the ore-water slurry, thus facilitating bitumen recovery.

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