Extraction of bitumen from oil sands using lime

Details Extraction of bitumen from oil sands using lime Extraction of bitumen from oil sands using lime

C - Chemistry, Metallurgy

10

G

C10G 1/04 (2006.01) E21B 43/16 (2006.01) E21B 43/22 (2006.01)

Patent

CA 2581586

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-water slurry. This occurs because water-soluble asphaltic acids formed at the bitumen-water interface act as surfactants and 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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